diff options
Diffstat (limited to 'subst.c~')
| -rw-r--r-- | subst.c~ | 9544 |
1 files changed, 0 insertions, 9544 deletions
diff --git a/subst.c~ b/subst.c~ deleted file mode 100644 index b56fc695..00000000 --- a/subst.c~ +++ /dev/null @@ -1,9544 +0,0 @@ -/* subst.c -- The part of the shell that does parameter, command, arithmetic, - and globbing substitutions. */ - -/* ``Have a little faith, there's magic in the night. You ain't a - beauty, but, hey, you're alright.'' */ - -/* Copyright (C) 1987-2013 Free Software Foundation, Inc. - - This file is part of GNU Bash, the Bourne Again SHell. - - Bash is free software: you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation, either version 3 of the License, or - (at your option) any later version. - - Bash is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with Bash. If not, see <http://www.gnu.org/licenses/>. -*/ - -#include "config.h" - -#include "bashtypes.h" -#include <stdio.h> -#include "chartypes.h" -#if defined (HAVE_PWD_H) -# include <pwd.h> -#endif -#include <signal.h> -#include <errno.h> - -#if defined (HAVE_UNISTD_H) -# include <unistd.h> -#endif - -#include "bashansi.h" -#include "posixstat.h" -#include "bashintl.h" - -#include "shell.h" -#include "parser.h" -#include "flags.h" -#include "jobs.h" -#include "execute_cmd.h" -#include "filecntl.h" -#include "trap.h" -#include "pathexp.h" -#include "mailcheck.h" - -#include "shmbutil.h" -#include "typemax.h" - -#include "builtins/getopt.h" -#include "builtins/common.h" - -#include "builtins/builtext.h" - -#include <tilde/tilde.h> -#include <glob/strmatch.h> - -#if !defined (errno) -extern int errno; -#endif /* !errno */ - -/* The size that strings change by. */ -#define DEFAULT_INITIAL_ARRAY_SIZE 112 -#define DEFAULT_ARRAY_SIZE 128 - -/* Variable types. */ -#define VT_VARIABLE 0 -#define VT_POSPARMS 1 -#define VT_ARRAYVAR 2 -#define VT_ARRAYMEMBER 3 -#define VT_ASSOCVAR 4 - -#define VT_STARSUB 128 /* $* or ${array[*]} -- used to split */ - -/* Flags for quoted_strchr */ -#define ST_BACKSL 0x01 -#define ST_CTLESC 0x02 -#define ST_SQUOTE 0x04 /* unused yet */ -#define ST_DQUOTE 0x08 /* unused yet */ - -/* Flags for the `pflags' argument to param_expand() */ -#define PF_NOCOMSUB 0x01 /* Do not perform command substitution */ -#define PF_IGNUNBOUND 0x02 /* ignore unbound vars even if -u set */ -#define PF_NOSPLIT2 0x04 /* same as W_NOSPLIT2 */ -#define PF_ASSIGNRHS 0x08 /* same as W_ASSIGNRHS */ - -/* These defs make it easier to use the editor. */ -#define LBRACE '{' -#define RBRACE '}' -#define LPAREN '(' -#define RPAREN ')' - -#if defined (HANDLE_MULTIBYTE) -#define WLPAREN L'(' -#define WRPAREN L')' -#endif - -/* Evaluates to 1 if C is one of the shell's special parameters whose length - can be taken, but is also one of the special expansion characters. */ -#define VALID_SPECIAL_LENGTH_PARAM(c) \ - ((c) == '-' || (c) == '?' || (c) == '#') - -/* Evaluates to 1 if C is one of the shell's special parameters for which an - indirect variable reference may be made. */ -#define VALID_INDIR_PARAM(c) \ - ((posixly_correct == 0 && (c) == '#') || (posixly_correct == 0 && (c) == '?') || (c) == '@' || (c) == '*') - -/* Evaluates to 1 if C is one of the OP characters that follows the parameter - in ${parameter[:]OPword}. */ -#define VALID_PARAM_EXPAND_CHAR(c) (sh_syntaxtab[(unsigned char)c] & CSUBSTOP) - -/* Evaluates to 1 if this is one of the shell's special variables. */ -#define SPECIAL_VAR(name, wi) \ - ((DIGIT (*name) && all_digits (name)) || \ - (name[1] == '\0' && (sh_syntaxtab[(unsigned char)*name] & CSPECVAR)) || \ - (wi && name[2] == '\0' && VALID_INDIR_PARAM (name[1]))) - -/* An expansion function that takes a string and a quoted flag and returns - a WORD_LIST *. Used as the type of the third argument to - expand_string_if_necessary(). */ -typedef WORD_LIST *EXPFUNC __P((char *, int)); - -/* Process ID of the last command executed within command substitution. */ -pid_t last_command_subst_pid = NO_PID; -pid_t current_command_subst_pid = NO_PID; - -/* Variables used to keep track of the characters in IFS. */ -SHELL_VAR *ifs_var; -char *ifs_value; -unsigned char ifs_cmap[UCHAR_MAX + 1]; -int ifs_is_set, ifs_is_null; - -#if defined (HANDLE_MULTIBYTE) -unsigned char ifs_firstc[MB_LEN_MAX]; -size_t ifs_firstc_len; -#else -unsigned char ifs_firstc; -#endif - -/* Sentinel to tell when we are performing variable assignments preceding a - command name and putting them into the environment. Used to make sure - we use the temporary environment when looking up variable values. */ -int assigning_in_environment; - -/* Used to hold a list of variable assignments preceding a command. Global - so the SIGCHLD handler in jobs.c can unwind-protect it when it runs a - SIGCHLD trap and so it can be saved and restored by the trap handlers. */ -WORD_LIST *subst_assign_varlist = (WORD_LIST *)NULL; - -/* Extern functions and variables from different files. */ -extern int last_command_exit_value, last_command_exit_signal; -extern int subshell_environment, line_number; -extern int subshell_level, parse_and_execute_level, sourcelevel; -extern int eof_encountered; -extern int return_catch_flag, return_catch_value; -extern pid_t dollar_dollar_pid; -extern int posixly_correct; -extern char *this_command_name; -extern struct fd_bitmap *current_fds_to_close; -extern int wordexp_only; -extern int expanding_redir; -extern int tempenv_assign_error; -extern int builtin_ignoring_errexit; - -#if !defined (HAVE_WCSDUP) && defined (HANDLE_MULTIBYTE) -extern wchar_t *wcsdup __P((const wchar_t *)); -#endif - -/* Non-zero means to allow unmatched globbed filenames to expand to - a null file. */ -int allow_null_glob_expansion; - -/* Non-zero means to throw an error when globbing fails to match anything. */ -int fail_glob_expansion; - -#if 0 -/* Variables to keep track of which words in an expanded word list (the - output of expand_word_list_internal) are the result of globbing - expansions. GLOB_ARGV_FLAGS is used by execute_cmd.c. - (CURRENTLY UNUSED). */ -char *glob_argv_flags; -static int glob_argv_flags_size; -#endif - -static WORD_LIST expand_word_error, expand_word_fatal; -static WORD_DESC expand_wdesc_error, expand_wdesc_fatal; -static char expand_param_error, expand_param_fatal; -static char extract_string_error, extract_string_fatal; - -/* Tell the expansion functions to not longjmp back to top_level on fatal - errors. Enabled when doing completion and prompt string expansion. */ -static int no_longjmp_on_fatal_error = 0; - -/* Set by expand_word_unsplit; used to inhibit splitting and re-joining - $* on $IFS, primarily when doing assignment statements. */ -static int expand_no_split_dollar_star = 0; - -/* A WORD_LIST of words to be expanded by expand_word_list_internal, - without any leading variable assignments. */ -static WORD_LIST *garglist = (WORD_LIST *)NULL; - -static char *quoted_substring __P((char *, int, int)); -static int quoted_strlen __P((char *)); -static char *quoted_strchr __P((char *, int, int)); - -static char *expand_string_if_necessary __P((char *, int, EXPFUNC *)); -static inline char *expand_string_to_string_internal __P((char *, int, EXPFUNC *)); -static WORD_LIST *call_expand_word_internal __P((WORD_DESC *, int, int, int *, int *)); -static WORD_LIST *expand_string_internal __P((char *, int)); -static WORD_LIST *expand_string_leave_quoted __P((char *, int)); -static WORD_LIST *expand_string_for_rhs __P((char *, int, int *, int *)); - -static WORD_LIST *list_quote_escapes __P((WORD_LIST *)); -static char *make_quoted_char __P((int)); -static WORD_LIST *quote_list __P((WORD_LIST *)); - -static int unquoted_substring __P((char *, char *)); -static int unquoted_member __P((int, char *)); - -#if defined (ARRAY_VARS) -static SHELL_VAR *do_compound_assignment __P((char *, char *, int)); -#endif -static int do_assignment_internal __P((const WORD_DESC *, int)); - -static char *string_extract_verbatim __P((char *, size_t, int *, char *, int)); -static char *string_extract __P((char *, int *, char *, int)); -static char *string_extract_double_quoted __P((char *, int *, int)); -static inline char *string_extract_single_quoted __P((char *, int *)); -static inline int skip_single_quoted __P((const char *, size_t, int)); -static int skip_double_quoted __P((char *, size_t, int)); -static char *extract_delimited_string __P((char *, int *, char *, char *, char *, int)); -static char *extract_dollar_brace_string __P((char *, int *, int, int)); -static int skip_matched_pair __P((const char *, int, int, int, int)); - -static char *pos_params __P((char *, int, int, int)); - -static unsigned char *mb_getcharlens __P((char *, int)); - -static char *remove_upattern __P((char *, char *, int)); -#if defined (HANDLE_MULTIBYTE) -static wchar_t *remove_wpattern __P((wchar_t *, size_t, wchar_t *, int)); -#endif -static char *remove_pattern __P((char *, char *, int)); - -static int match_upattern __P((char *, char *, int, char **, char **)); -#if defined (HANDLE_MULTIBYTE) -static int match_wpattern __P((wchar_t *, char **, size_t, wchar_t *, int, char **, char **)); -#endif -static int match_pattern __P((char *, char *, int, char **, char **)); -static int getpatspec __P((int, char *)); -static char *getpattern __P((char *, int, int)); -static char *variable_remove_pattern __P((char *, char *, int, int)); -static char *list_remove_pattern __P((WORD_LIST *, char *, int, int, int)); -static char *parameter_list_remove_pattern __P((int, char *, int, int)); -#ifdef ARRAY_VARS -static char *array_remove_pattern __P((SHELL_VAR *, char *, int, char *, int)); -#endif -static char *parameter_brace_remove_pattern __P((char *, char *, int, char *, int, int, int)); - -static char *process_substitute __P((char *, int)); - -static char *read_comsub __P((int, int, int *)); - -#ifdef ARRAY_VARS -static arrayind_t array_length_reference __P((char *)); -#endif - -static int valid_brace_expansion_word __P((char *, int)); -static int chk_atstar __P((char *, int, int *, int *)); -static int chk_arithsub __P((const char *, int)); - -static WORD_DESC *parameter_brace_expand_word __P((char *, int, int, int, arrayind_t *)); -static WORD_DESC *parameter_brace_expand_indir __P((char *, int, int, int *, int *)); -static WORD_DESC *parameter_brace_expand_rhs __P((char *, char *, int, int, int *, int *)); -static void parameter_brace_expand_error __P((char *, char *)); - -static int valid_length_expression __P((char *)); -static intmax_t parameter_brace_expand_length __P((char *)); - -static char *skiparith __P((char *, int)); -static int verify_substring_values __P((SHELL_VAR *, char *, char *, int, intmax_t *, intmax_t *)); -static int get_var_and_type __P((char *, char *, arrayind_t, int, int, SHELL_VAR **, char **)); -static char *mb_substring __P((char *, int, int)); -static char *parameter_brace_substring __P((char *, char *, int, char *, int, int)); - -static int shouldexp_replacement __P((char *)); - -static char *pos_params_pat_subst __P((char *, char *, char *, int)); - -static char *parameter_brace_patsub __P((char *, char *, int, char *, int, int)); - -static char *pos_params_casemod __P((char *, char *, int, int)); -static char *parameter_brace_casemod __P((char *, char *, int, int, char *, int, int)); - -static WORD_DESC *parameter_brace_expand __P((char *, int *, int, int, int *, int *)); -static WORD_DESC *param_expand __P((char *, int *, int, int *, int *, int *, int *, int)); - -static WORD_LIST *expand_word_internal __P((WORD_DESC *, int, int, int *, int *)); - -static WORD_LIST *word_list_split __P((WORD_LIST *)); - -static void exp_jump_to_top_level __P((int)); - -static WORD_LIST *separate_out_assignments __P((WORD_LIST *)); -static WORD_LIST *glob_expand_word_list __P((WORD_LIST *, int)); -#ifdef BRACE_EXPANSION -static WORD_LIST *brace_expand_word_list __P((WORD_LIST *, int)); -#endif -#if defined (ARRAY_VARS) -static int make_internal_declare __P((char *, char *)); -#endif -static WORD_LIST *shell_expand_word_list __P((WORD_LIST *, int)); -static WORD_LIST *expand_word_list_internal __P((WORD_LIST *, int)); - -/* **************************************************************** */ -/* */ -/* Utility Functions */ -/* */ -/* **************************************************************** */ - -#if defined (DEBUG) -void -dump_word_flags (flags) - int flags; -{ - int f; - - f = flags; - fprintf (stderr, "%d -> ", f); - if (f & W_ASSIGNASSOC) - { - f &= ~W_ASSIGNASSOC; - fprintf (stderr, "W_ASSIGNASSOC%s", f ? "|" : ""); - } - if (f & W_ASSIGNARRAY) - { - f &= ~W_ASSIGNARRAY; - fprintf (stderr, "W_ASSIGNARRAY%s", f ? "|" : ""); - } - if (f & W_HASCTLESC) - { - f &= ~W_HASCTLESC; - fprintf (stderr, "W_HASCTLESC%s", f ? "|" : ""); - } - if (f & W_NOPROCSUB) - { - f &= ~W_NOPROCSUB; - fprintf (stderr, "W_NOPROCSUB%s", f ? "|" : ""); - } - if (f & W_DQUOTE) - { - f &= ~W_DQUOTE; - fprintf (stderr, "W_DQUOTE%s", f ? "|" : ""); - } - if (f & W_HASQUOTEDNULL) - { - f &= ~W_HASQUOTEDNULL; - fprintf (stderr, "W_HASQUOTEDNULL%s", f ? "|" : ""); - } - if (f & W_ASSIGNARG) - { - f &= ~W_ASSIGNARG; - fprintf (stderr, "W_ASSIGNARG%s", f ? "|" : ""); - } - if (f & W_ASSNBLTIN) - { - f &= ~W_ASSNBLTIN; - fprintf (stderr, "W_ASSNBLTIN%s", f ? "|" : ""); - } - if (f & W_ASSNGLOBAL) - { - f &= ~W_ASSNGLOBAL; - fprintf (stderr, "W_ASSNGLOBAL%s", f ? "|" : ""); - } - if (f & W_COMPASSIGN) - { - f &= ~W_COMPASSIGN; - fprintf (stderr, "W_COMPASSIGN%s", f ? "|" : ""); - } - if (f & W_NOEXPAND) - { - f &= ~W_NOEXPAND; - fprintf (stderr, "W_NOEXPAND%s", f ? "|" : ""); - } - if (f & W_ITILDE) - { - f &= ~W_ITILDE; - fprintf (stderr, "W_ITILDE%s", f ? "|" : ""); - } - if (f & W_NOTILDE) - { - f &= ~W_NOTILDE; - fprintf (stderr, "W_NOTILDE%s", f ? "|" : ""); - } - if (f & W_ASSIGNRHS) - { - f &= ~W_ASSIGNRHS; - fprintf (stderr, "W_ASSIGNRHS%s", f ? "|" : ""); - } - if (f & W_NOCOMSUB) - { - f &= ~W_NOCOMSUB; - fprintf (stderr, "W_NOCOMSUB%s", f ? "|" : ""); - } - if (f & W_DOLLARSTAR) - { - f &= ~W_DOLLARSTAR; - fprintf (stderr, "W_DOLLARSTAR%s", f ? "|" : ""); - } - if (f & W_DOLLARAT) - { - f &= ~W_DOLLARAT; - fprintf (stderr, "W_DOLLARAT%s", f ? "|" : ""); - } - if (f & W_TILDEEXP) - { - f &= ~W_TILDEEXP; - fprintf (stderr, "W_TILDEEXP%s", f ? "|" : ""); - } - if (f & W_NOSPLIT2) - { - f &= ~W_NOSPLIT2; - fprintf (stderr, "W_NOSPLIT2%s", f ? "|" : ""); - } - if (f & W_NOSPLIT) - { - f &= ~W_NOSPLIT; - fprintf (stderr, "W_NOSPLIT%s", f ? "|" : ""); - } - if (f & W_NOBRACE) - { - f &= ~W_NOBRACE; - fprintf (stderr, "W_NOBRACE%s", f ? "|" : ""); - } - if (f & W_NOGLOB) - { - f &= ~W_NOGLOB; - fprintf (stderr, "W_NOGLOB%s", f ? "|" : ""); - } - if (f & W_SPLITSPACE) - { - f &= ~W_SPLITSPACE; - fprintf (stderr, "W_SPLITSPACE%s", f ? "|" : ""); - } - if (f & W_ASSIGNMENT) - { - f &= ~W_ASSIGNMENT; - fprintf (stderr, "W_ASSIGNMENT%s", f ? "|" : ""); - } - if (f & W_QUOTED) - { - f &= ~W_QUOTED; - fprintf (stderr, "W_QUOTED%s", f ? "|" : ""); - } - if (f & W_HASDOLLAR) - { - f &= ~W_HASDOLLAR; - fprintf (stderr, "W_HASDOLLAR%s", f ? "|" : ""); - } - fprintf (stderr, "\n"); - fflush (stderr); -} -#endif - -#ifdef INCLUDE_UNUSED -static char * -quoted_substring (string, start, end) - char *string; - int start, end; -{ - register int len, l; - register char *result, *s, *r; - - len = end - start; - - /* Move to string[start], skipping quoted characters. */ - for (s = string, l = 0; *s && l < start; ) - { - if (*s == CTLESC) - { - s++; - continue; - } - l++; - if (*s == 0) - break; - } - - r = result = (char *)xmalloc (2*len + 1); /* save room for quotes */ - - /* Copy LEN characters, including quote characters. */ - s = string + l; - for (l = 0; l < len; s++) - { - if (*s == CTLESC) - *r++ = *s++; - *r++ = *s; - l++; - if (*s == 0) - break; - } - *r = '\0'; - return result; -} -#endif - -#ifdef INCLUDE_UNUSED -/* Return the length of S, skipping over quoted characters */ -static int -quoted_strlen (s) - char *s; -{ - register char *p; - int i; - - i = 0; - for (p = s; *p; p++) - { - if (*p == CTLESC) - { - p++; - if (*p == 0) - return (i + 1); - } - i++; - } - - return i; -} -#endif - -/* Find the first occurrence of character C in string S, obeying shell - quoting rules. If (FLAGS & ST_BACKSL) is non-zero, backslash-escaped - characters are skipped. If (FLAGS & ST_CTLESC) is non-zero, characters - escaped with CTLESC are skipped. */ -static char * -quoted_strchr (s, c, flags) - char *s; - int c, flags; -{ - register char *p; - - for (p = s; *p; p++) - { - if (((flags & ST_BACKSL) && *p == '\\') - || ((flags & ST_CTLESC) && *p == CTLESC)) - { - p++; - if (*p == '\0') - return ((char *)NULL); - continue; - } - else if (*p == c) - return p; - } - return ((char *)NULL); -} - -/* Return 1 if CHARACTER appears in an unquoted portion of - STRING. Return 0 otherwise. CHARACTER must be a single-byte character. */ -static int -unquoted_member (character, string) - int character; - char *string; -{ - size_t slen; - int sindex, c; - DECLARE_MBSTATE; - - slen = strlen (string); - sindex = 0; - while (c = string[sindex]) - { - if (c == character) - return (1); - - switch (c) - { - default: - ADVANCE_CHAR (string, slen, sindex); - break; - - case '\\': - sindex++; - if (string[sindex]) - ADVANCE_CHAR (string, slen, sindex); - break; - - case '\'': - sindex = skip_single_quoted (string, slen, ++sindex); - break; - - case '"': - sindex = skip_double_quoted (string, slen, ++sindex); - break; - } - } - return (0); -} - -/* Return 1 if SUBSTR appears in an unquoted portion of STRING. */ -static int -unquoted_substring (substr, string) - char *substr, *string; -{ - size_t slen; - int sindex, c, sublen; - DECLARE_MBSTATE; - - if (substr == 0 || *substr == '\0') - return (0); - - slen = strlen (string); - sublen = strlen (substr); - for (sindex = 0; c = string[sindex]; ) - { - if (STREQN (string + sindex, substr, sublen)) - return (1); - - switch (c) - { - case '\\': - sindex++; - if (string[sindex]) - ADVANCE_CHAR (string, slen, sindex); - break; - - case '\'': - sindex = skip_single_quoted (string, slen, ++sindex); - break; - - case '"': - sindex = skip_double_quoted (string, slen, ++sindex); - break; - - default: - ADVANCE_CHAR (string, slen, sindex); - break; - } - } - return (0); -} - -/* Most of the substitutions must be done in parallel. In order - to avoid using tons of unclear goto's, I have some functions - for manipulating malloc'ed strings. They all take INDX, a - pointer to an integer which is the offset into the string - where manipulation is taking place. They also take SIZE, a - pointer to an integer which is the current length of the - character array for this string. */ - -/* Append SOURCE to TARGET at INDEX. SIZE is the current amount - of space allocated to TARGET. SOURCE can be NULL, in which - case nothing happens. Gets rid of SOURCE by freeing it. - Returns TARGET in case the location has changed. */ -INLINE char * -sub_append_string (source, target, indx, size) - char *source, *target; - int *indx, *size; -{ - if (source) - { - int srclen, n; - - srclen = STRLEN (source); - if (srclen >= (int)(*size - *indx)) - { - n = srclen + *indx; - n = (n + DEFAULT_ARRAY_SIZE) - (n % DEFAULT_ARRAY_SIZE); - target = (char *)xrealloc (target, (*size = n)); - } - - FASTCOPY (source, target + *indx, srclen); - *indx += srclen; - target[*indx] = '\0'; - - free (source); - } - return (target); -} - -#if 0 -/* UNUSED */ -/* Append the textual representation of NUMBER to TARGET. - INDX and SIZE are as in SUB_APPEND_STRING. */ -char * -sub_append_number (number, target, indx, size) - intmax_t number; - int *indx, *size; - char *target; -{ - char *temp; - - temp = itos (number); - return (sub_append_string (temp, target, indx, size)); -} -#endif - -/* Extract a substring from STRING, starting at SINDEX and ending with - one of the characters in CHARLIST. Don't make the ending character - part of the string. Leave SINDEX pointing at the ending character. - Understand about backslashes in the string. If (flags & SX_VARNAME) - is non-zero, and array variables have been compiled into the shell, - everything between a `[' and a corresponding `]' is skipped over. - If (flags & SX_NOALLOC) is non-zero, don't return the substring, just - update SINDEX. If (flags & SX_REQMATCH) is non-zero, the string must - contain a closing character from CHARLIST. */ -static char * -string_extract (string, sindex, charlist, flags) - char *string; - int *sindex; - char *charlist; - int flags; -{ - register int c, i; - int found; - size_t slen; - char *temp; - DECLARE_MBSTATE; - - slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 0; - i = *sindex; - found = 0; - while (c = string[i]) - { - if (c == '\\') - { - if (string[i + 1]) - i++; - else - break; - } -#if defined (ARRAY_VARS) - else if ((flags & SX_VARNAME) && c == '[') - { - int ni; - /* If this is an array subscript, skip over it and continue. */ - ni = skipsubscript (string, i, 0); - if (string[ni] == ']') - i = ni; - } -#endif - else if (MEMBER (c, charlist)) - { - found = 1; - break; - } - - ADVANCE_CHAR (string, slen, i); - } - - /* If we had to have a matching delimiter and didn't find one, return an - error and let the caller deal with it. */ - if ((flags & SX_REQMATCH) && found == 0) - { - *sindex = i; - return (&extract_string_error); - } - - temp = (flags & SX_NOALLOC) ? (char *)NULL : substring (string, *sindex, i); - *sindex = i; - - return (temp); -} - -/* Extract the contents of STRING as if it is enclosed in double quotes. - SINDEX, when passed in, is the offset of the character immediately - following the opening double quote; on exit, SINDEX is left pointing after - the closing double quote. If STRIPDQ is non-zero, unquoted double - quotes are stripped and the string is terminated by a null byte. - Backslashes between the embedded double quotes are processed. If STRIPDQ - is zero, an unquoted `"' terminates the string. */ -static char * -string_extract_double_quoted (string, sindex, stripdq) - char *string; - int *sindex, stripdq; -{ - size_t slen; - char *send; - int j, i, t; - unsigned char c; - char *temp, *ret; /* The new string we return. */ - int pass_next, backquote, si; /* State variables for the machine. */ - int dquote; - DECLARE_MBSTATE; - - slen = strlen (string + *sindex) + *sindex; - send = string + slen; - - pass_next = backquote = dquote = 0; - temp = (char *)xmalloc (1 + slen - *sindex); - - j = 0; - i = *sindex; - while (c = string[i]) - { - /* Process a character that was quoted by a backslash. */ - if (pass_next) - { - /* XXX - take another look at this in light of Interp 221 */ - /* Posix.2 sez: - - ``The backslash shall retain its special meaning as an escape - character only when followed by one of the characters: - $ ` " \ <newline>''. - - If STRIPDQ is zero, we handle the double quotes here and let - expand_word_internal handle the rest. If STRIPDQ is non-zero, - we have already been through one round of backslash stripping, - and want to strip these backslashes only if DQUOTE is non-zero, - indicating that we are inside an embedded double-quoted string. */ - - /* If we are in an embedded quoted string, then don't strip - backslashes before characters for which the backslash - retains its special meaning, but remove backslashes in - front of other characters. If we are not in an - embedded quoted string, don't strip backslashes at all. - This mess is necessary because the string was already - surrounded by double quotes (and sh has some really weird - quoting rules). - The returned string will be run through expansion as if - it were double-quoted. */ - if ((stripdq == 0 && c != '"') || - (stripdq && ((dquote && (sh_syntaxtab[c] & CBSDQUOTE)) || dquote == 0))) - temp[j++] = '\\'; - pass_next = 0; - -add_one_character: - COPY_CHAR_I (temp, j, string, send, i); - continue; - } - - /* A backslash protects the next character. The code just above - handles preserving the backslash in front of any character but - a double quote. */ - if (c == '\\') - { - pass_next++; - i++; - continue; - } - - /* Inside backquotes, ``the portion of the quoted string from the - initial backquote and the characters up to the next backquote - that is not preceded by a backslash, having escape characters - removed, defines that command''. */ - if (backquote) - { - if (c == '`') - backquote = 0; - temp[j++] = c; - i++; - continue; - } - - if (c == '`') - { - temp[j++] = c; - backquote++; - i++; - continue; - } - - /* Pass everything between `$(' and the matching `)' or a quoted - ${ ... } pair through according to the Posix.2 specification. */ - if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) - { - int free_ret = 1; - - si = i + 2; - if (string[i + 1] == LPAREN) - ret = extract_command_subst (string, &si, 0); - else - ret = extract_dollar_brace_string (string, &si, Q_DOUBLE_QUOTES, 0); - - temp[j++] = '$'; - temp[j++] = string[i + 1]; - - /* Just paranoia; ret will not be 0 unless no_longjmp_on_fatal_error - is set. */ - if (ret == 0 && no_longjmp_on_fatal_error) - { - free_ret = 0; - ret = string + i + 2; - } - - for (t = 0; ret[t]; t++, j++) - temp[j] = ret[t]; - temp[j] = string[si]; - - if (string[si]) - { - j++; - i = si + 1; - } - else - i = si; - - if (free_ret) - free (ret); - continue; - } - - /* Add any character but a double quote to the quoted string we're - accumulating. */ - if (c != '"') - goto add_one_character; - - /* c == '"' */ - if (stripdq) - { - dquote ^= 1; - i++; - continue; - } - - break; - } - temp[j] = '\0'; - - /* Point to after the closing quote. */ - if (c) - i++; - *sindex = i; - - return (temp); -} - -/* This should really be another option to string_extract_double_quoted. */ -static int -skip_double_quoted (string, slen, sind) - char *string; - size_t slen; - int sind; -{ - int c, i; - char *ret; - int pass_next, backquote, si; - DECLARE_MBSTATE; - - pass_next = backquote = 0; - i = sind; - while (c = string[i]) - { - if (pass_next) - { - pass_next = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '\\') - { - pass_next++; - i++; - continue; - } - else if (backquote) - { - if (c == '`') - backquote = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '`') - { - backquote++; - i++; - continue; - } - else if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) - { - si = i + 2; - if (string[i + 1] == LPAREN) - ret = extract_command_subst (string, &si, SX_NOALLOC); - else - ret = extract_dollar_brace_string (string, &si, Q_DOUBLE_QUOTES, SX_NOALLOC); - - i = si + 1; - continue; - } - else if (c != '"') - { - ADVANCE_CHAR (string, slen, i); - continue; - } - else - break; - } - - if (c) - i++; - - return (i); -} - -/* Extract the contents of STRING as if it is enclosed in single quotes. - SINDEX, when passed in, is the offset of the character immediately - following the opening single quote; on exit, SINDEX is left pointing after - the closing single quote. */ -static inline char * -string_extract_single_quoted (string, sindex) - char *string; - int *sindex; -{ - register int i; - size_t slen; - char *t; - DECLARE_MBSTATE; - - /* Don't need slen for ADVANCE_CHAR unless multibyte chars possible. */ - slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 0; - i = *sindex; - while (string[i] && string[i] != '\'') - ADVANCE_CHAR (string, slen, i); - - t = substring (string, *sindex, i); - - if (string[i]) - i++; - *sindex = i; - - return (t); -} - -static inline int -skip_single_quoted (string, slen, sind) - const char *string; - size_t slen; - int sind; -{ - register int c; - DECLARE_MBSTATE; - - c = sind; - while (string[c] && string[c] != '\'') - ADVANCE_CHAR (string, slen, c); - - if (string[c]) - c++; - return c; -} - -/* Just like string_extract, but doesn't hack backslashes or any of - that other stuff. Obeys CTLESC quoting. Used to do splitting on $IFS. */ -static char * -string_extract_verbatim (string, slen, sindex, charlist, flags) - char *string; - size_t slen; - int *sindex; - char *charlist; - int flags; -{ - register int i; -#if defined (HANDLE_MULTIBYTE) - size_t clen; - wchar_t *wcharlist; -#endif - int c; - char *temp; - DECLARE_MBSTATE; - - if (charlist[0] == '\'' && charlist[1] == '\0') - { - temp = string_extract_single_quoted (string, sindex); - --*sindex; /* leave *sindex at separator character */ - return temp; - } - - i = *sindex; -#if 0 - /* See how the MBLEN and ADVANCE_CHAR macros work to understand why we need - this only if MB_CUR_MAX > 1. */ - slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 1; -#endif -#if defined (HANDLE_MULTIBYTE) - clen = strlen (charlist); - wcharlist = 0; -#endif - while (c = string[i]) - { -#if defined (HANDLE_MULTIBYTE) - size_t mblength; -#endif - if ((flags & SX_NOCTLESC) == 0 && c == CTLESC) - { - i += 2; - continue; - } - /* Even if flags contains SX_NOCTLESC, we let CTLESC quoting CTLNUL - through, to protect the CTLNULs from later calls to - remove_quoted_nulls. */ - else if ((flags & SX_NOESCCTLNUL) == 0 && c == CTLESC && string[i+1] == CTLNUL) - { - i += 2; - continue; - } - -#if defined (HANDLE_MULTIBYTE) - mblength = MBLEN (string + i, slen - i); - if (mblength > 1) - { - wchar_t wc; - mblength = mbtowc (&wc, string + i, slen - i); - if (MB_INVALIDCH (mblength)) - { - if (MEMBER (c, charlist)) - break; - } - else - { - if (wcharlist == 0) - { - size_t len; - len = mbstowcs (wcharlist, charlist, 0); - if (len == -1) - len = 0; - wcharlist = (wchar_t *)xmalloc (sizeof (wchar_t) * (len + 1)); - mbstowcs (wcharlist, charlist, len + 1); - } - - if (wcschr (wcharlist, wc)) - break; - } - } - else -#endif - if (MEMBER (c, charlist)) - break; - - ADVANCE_CHAR (string, slen, i); - } - -#if defined (HANDLE_MULTIBYTE) - FREE (wcharlist); -#endif - - temp = substring (string, *sindex, i); - *sindex = i; - - return (temp); -} - -/* Extract the $( construct in STRING, and return a new string. - Start extracting at (SINDEX) as if we had just seen "$(". - Make (SINDEX) get the position of the matching ")". ) - XFLAGS is additional flags to pass to other extraction functions. */ -char * -extract_command_subst (string, sindex, xflags) - char *string; - int *sindex; - int xflags; -{ - if (string[*sindex] == LPAREN) - return (extract_delimited_string (string, sindex, "$(", "(", ")", xflags|SX_COMMAND)); /*)*/ - else - { - xflags |= (no_longjmp_on_fatal_error ? SX_NOLONGJMP : 0); - return (xparse_dolparen (string, string+*sindex, sindex, xflags)); - } -} - -/* Extract the $[ construct in STRING, and return a new string. (]) - Start extracting at (SINDEX) as if we had just seen "$[". - Make (SINDEX) get the position of the matching "]". */ -char * -extract_arithmetic_subst (string, sindex) - char *string; - int *sindex; -{ - return (extract_delimited_string (string, sindex, "$[", "[", "]", 0)); /*]*/ -} - -#if defined (PROCESS_SUBSTITUTION) -/* Extract the <( or >( construct in STRING, and return a new string. - Start extracting at (SINDEX) as if we had just seen "<(". - Make (SINDEX) get the position of the matching ")". */ /*))*/ -char * -extract_process_subst (string, starter, sindex) - char *string; - char *starter; - int *sindex; -{ - return (extract_delimited_string (string, sindex, starter, "(", ")", SX_COMMAND)); -} -#endif /* PROCESS_SUBSTITUTION */ - -#if defined (ARRAY_VARS) -/* This can be fooled by unquoted right parens in the passed string. If - each caller verifies that the last character in STRING is a right paren, - we don't even need to call extract_delimited_string. */ -char * -extract_array_assignment_list (string, sindex) - char *string; - int *sindex; -{ - int slen; - char *ret; - - slen = strlen (string); /* ( */ - if (string[slen - 1] == ')') - { - ret = substring (string, *sindex, slen - 1); - *sindex = slen - 1; - return ret; - } - return 0; -} -#endif - -/* Extract and create a new string from the contents of STRING, a - character string delimited with OPENER and CLOSER. SINDEX is - the address of an int describing the current offset in STRING; - it should point to just after the first OPENER found. On exit, - SINDEX gets the position of the last character of the matching CLOSER. - If OPENER is more than a single character, ALT_OPENER, if non-null, - contains a character string that can also match CLOSER and thus - needs to be skipped. */ -static char * -extract_delimited_string (string, sindex, opener, alt_opener, closer, flags) - char *string; - int *sindex; - char *opener, *alt_opener, *closer; - int flags; -{ - int i, c, si; - size_t slen; - char *t, *result; - int pass_character, nesting_level, in_comment; - int len_closer, len_opener, len_alt_opener; - DECLARE_MBSTATE; - - slen = strlen (string + *sindex) + *sindex; - len_opener = STRLEN (opener); - len_alt_opener = STRLEN (alt_opener); - len_closer = STRLEN (closer); - - pass_character = in_comment = 0; - - nesting_level = 1; - i = *sindex; - - while (nesting_level) - { - c = string[i]; - - if (c == 0) - break; - - if (in_comment) - { - if (c == '\n') - in_comment = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - - if (pass_character) /* previous char was backslash */ - { - pass_character = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - - /* Not exactly right yet; should handle shell metacharacters and - multibyte characters, too. See COMMENT_BEGIN define in parse.y */ - if ((flags & SX_COMMAND) && c == '#' && (i == 0 || string[i - 1] == '\n' || shellblank (string[i - 1]))) - { - in_comment = 1; - ADVANCE_CHAR (string, slen, i); - continue; - } - - if (c == CTLESC || c == '\\') - { - pass_character++; - i++; - continue; - } - - /* Process a nested command substitution, but only if we're parsing an - arithmetic substitution. */ - if ((flags & SX_COMMAND) && string[i] == '$' && string[i+1] == LPAREN) - { - si = i + 2; - t = extract_command_subst (string, &si, flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* Process a nested OPENER. */ - if (STREQN (string + i, opener, len_opener)) - { - si = i + len_opener; - t = extract_delimited_string (string, &si, opener, alt_opener, closer, flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* Process a nested ALT_OPENER */ - if (len_alt_opener && STREQN (string + i, alt_opener, len_alt_opener)) - { - si = i + len_alt_opener; - t = extract_delimited_string (string, &si, alt_opener, alt_opener, closer, flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* If the current substring terminates the delimited string, decrement - the nesting level. */ - if (STREQN (string + i, closer, len_closer)) - { - i += len_closer - 1; /* move to last byte of the closer */ - nesting_level--; - if (nesting_level == 0) - break; - } - - /* Pass old-style command substitution through verbatim. */ - if (c == '`') - { - si = i + 1; - t = string_extract (string, &si, "`", flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* Pass single-quoted and double-quoted strings through verbatim. */ - if (c == '\'' || c == '"') - { - si = i + 1; - i = (c == '\'') ? skip_single_quoted (string, slen, si) - : skip_double_quoted (string, slen, si); - continue; - } - - /* move past this character, which was not special. */ - ADVANCE_CHAR (string, slen, i); - } - - if (c == 0 && nesting_level) - { - if (no_longjmp_on_fatal_error == 0) - { - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("bad substitution: no closing `%s' in %s"), closer, string); - exp_jump_to_top_level (DISCARD); - } - else - { - *sindex = i; - return (char *)NULL; - } - } - - si = i - *sindex - len_closer + 1; - if (flags & SX_NOALLOC) - result = (char *)NULL; - else - { - result = (char *)xmalloc (1 + si); - strncpy (result, string + *sindex, si); - result[si] = '\0'; - } - *sindex = i; - - return (result); -} - -/* Extract a parameter expansion expression within ${ and } from STRING. - Obey the Posix.2 rules for finding the ending `}': count braces while - skipping over enclosed quoted strings and command substitutions. - SINDEX is the address of an int describing the current offset in STRING; - it should point to just after the first `{' found. On exit, SINDEX - gets the position of the matching `}'. QUOTED is non-zero if this - occurs inside double quotes. */ -/* XXX -- this is very similar to extract_delimited_string -- XXX */ -static char * -extract_dollar_brace_string (string, sindex, quoted, flags) - char *string; - int *sindex, quoted, flags; -{ - register int i, c; - size_t slen; - int pass_character, nesting_level, si, dolbrace_state; - char *result, *t; - DECLARE_MBSTATE; - - pass_character = 0; - nesting_level = 1; - slen = strlen (string + *sindex) + *sindex; - - /* The handling of dolbrace_state needs to agree with the code in parse.y: - parse_matched_pair(). The different initial value is to handle the - case where this function is called to parse the word in - ${param op word} (SX_WORD). */ - dolbrace_state = (flags & SX_WORD) ? DOLBRACE_WORD : DOLBRACE_PARAM; - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && (flags & SX_POSIXEXP)) - dolbrace_state = DOLBRACE_QUOTE; - - i = *sindex; - while (c = string[i]) - { - if (pass_character) - { - pass_character = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - - /* CTLESCs and backslashes quote the next character. */ - if (c == CTLESC || c == '\\') - { - pass_character++; - i++; - continue; - } - - if (string[i] == '$' && string[i+1] == LBRACE) - { - nesting_level++; - i += 2; - continue; - } - - if (c == RBRACE) - { - nesting_level--; - if (nesting_level == 0) - break; - i++; - continue; - } - - /* Pass the contents of old-style command substitutions through - verbatim. */ - if (c == '`') - { - si = i + 1; - t = string_extract (string, &si, "`", flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* Pass the contents of new-style command substitutions and - arithmetic substitutions through verbatim. */ - if (string[i] == '$' && string[i+1] == LPAREN) - { - si = i + 2; - t = extract_command_subst (string, &si, flags|SX_NOALLOC); - i = si + 1; - continue; - } - - /* Pass the contents of double-quoted strings through verbatim. */ - if (c == '"') - { - si = i + 1; - i = skip_double_quoted (string, slen, si); - /* skip_XXX_quoted leaves index one past close quote */ - continue; - } - - if (c == '\'') - { -/*itrace("extract_dollar_brace_string: c == single quote flags = %d quoted = %d dolbrace_state = %d", flags, quoted, dolbrace_state);*/ - if (posixly_correct && shell_compatibility_level > 41 && dolbrace_state != DOLBRACE_QUOTE && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ADVANCE_CHAR (string, slen, i); - else - { - si = i + 1; - i = skip_single_quoted (string, slen, si); - } - - continue; - } - - /* move past this character, which was not special. */ - ADVANCE_CHAR (string, slen, i); - - /* This logic must agree with parse.y:parse_matched_pair, since they - share the same defines. */ - if (dolbrace_state == DOLBRACE_PARAM && c == '%' && (i - *sindex) > 1) - dolbrace_state = DOLBRACE_QUOTE; - else if (dolbrace_state == DOLBRACE_PARAM && c == '#' && (i - *sindex) > 1) - dolbrace_state = DOLBRACE_QUOTE; - else if (dolbrace_state == DOLBRACE_PARAM && c == '/' && (i - *sindex) > 1) - dolbrace_state = DOLBRACE_QUOTE; - else if (dolbrace_state == DOLBRACE_PARAM && c == '^' && (i - *sindex) > 1) - dolbrace_state = DOLBRACE_QUOTE; - else if (dolbrace_state == DOLBRACE_PARAM && c == ',' && (i - *sindex) > 1) - dolbrace_state = DOLBRACE_QUOTE; - else if (dolbrace_state == DOLBRACE_PARAM && strchr ("#%^,~:-=?+/", c) != 0) - dolbrace_state = DOLBRACE_OP; - else if (dolbrace_state == DOLBRACE_OP && strchr ("#%^,~:-=?+/", c) == 0) - dolbrace_state = DOLBRACE_WORD; - } - - if (c == 0 && nesting_level) - { - if (no_longjmp_on_fatal_error == 0) - { /* { */ - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("bad substitution: no closing `%s' in %s"), "}", string); - exp_jump_to_top_level (DISCARD); - } - else - { - *sindex = i; - return ((char *)NULL); - } - } - - result = (flags & SX_NOALLOC) ? (char *)NULL : substring (string, *sindex, i); - *sindex = i; - - return (result); -} - -/* Remove backslashes which are quoting backquotes from STRING. Modifies - STRING, and returns a pointer to it. */ -char * -de_backslash (string) - char *string; -{ - register size_t slen; - register int i, j, prev_i; - DECLARE_MBSTATE; - - slen = strlen (string); - i = j = 0; - - /* Loop copying string[i] to string[j], i >= j. */ - while (i < slen) - { - if (string[i] == '\\' && (string[i + 1] == '`' || string[i + 1] == '\\' || - string[i + 1] == '$')) - i++; - prev_i = i; - ADVANCE_CHAR (string, slen, i); - if (j < prev_i) - do string[j++] = string[prev_i++]; while (prev_i < i); - else - j = i; - } - string[j] = '\0'; - - return (string); -} - -#if 0 -/*UNUSED*/ -/* Replace instances of \! in a string with !. */ -void -unquote_bang (string) - char *string; -{ - register int i, j; - register char *temp; - - temp = (char *)xmalloc (1 + strlen (string)); - - for (i = 0, j = 0; (temp[j] = string[i]); i++, j++) - { - if (string[i] == '\\' && string[i + 1] == '!') - { - temp[j] = '!'; - i++; - } - } - strcpy (string, temp); - free (temp); -} -#endif - -#define CQ_RETURN(x) do { no_longjmp_on_fatal_error = 0; return (x); } while (0) - -/* This function assumes s[i] == open; returns with s[ret] == close; used to - parse array subscripts. FLAGS & 1 means to not attempt to skip over - matched pairs of quotes or backquotes, or skip word expansions; it is - intended to be used after expansion has been performed and during final - assignment parsing (see arrayfunc.c:assign_compound_array_list()). */ -static int -skip_matched_pair (string, start, open, close, flags) - const char *string; - int start, open, close, flags; -{ - int i, pass_next, backq, si, c, count; - size_t slen; - char *temp, *ss; - DECLARE_MBSTATE; - - slen = strlen (string + start) + start; - no_longjmp_on_fatal_error = 1; - - i = start + 1; /* skip over leading bracket */ - count = 1; - pass_next = backq = 0; - ss = (char *)string; - while (c = string[i]) - { - if (pass_next) - { - pass_next = 0; - if (c == 0) - CQ_RETURN(i); - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '\\') - { - pass_next = 1; - i++; - continue; - } - else if (backq) - { - if (c == '`') - backq = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - else if ((flags & 1) == 0 && c == '`') - { - backq = 1; - i++; - continue; - } - else if ((flags & 1) == 0 && c == open) - { - count++; - i++; - continue; - } - else if (c == close) - { - count--; - if (count == 0) - break; - i++; - continue; - } - else if ((flags & 1) == 0 && (c == '\'' || c == '"')) - { - i = (c == '\'') ? skip_single_quoted (ss, slen, ++i) - : skip_double_quoted (ss, slen, ++i); - /* no increment, the skip functions increment past the closing quote. */ - } - else if ((flags&1) == 0 && c == '$' && (string[i+1] == LPAREN || string[i+1] == LBRACE)) - { - si = i + 2; - if (string[si] == '\0') - CQ_RETURN(si); - - if (string[i+1] == LPAREN) - temp = extract_delimited_string (ss, &si, "$(", "(", ")", SX_NOALLOC|SX_COMMAND); /* ) */ - else - temp = extract_dollar_brace_string (ss, &si, 0, SX_NOALLOC); - i = si; - if (string[i] == '\0') /* don't increment i past EOS in loop */ - break; - i++; - continue; - } - else - ADVANCE_CHAR (string, slen, i); - } - - CQ_RETURN(i); -} - -#if defined (ARRAY_VARS) -int -skipsubscript (string, start, flags) - const char *string; - int start, flags; -{ - return (skip_matched_pair (string, start, '[', ']', flags)); -} -#endif - -/* Skip characters in STRING until we find a character in DELIMS, and return - the index of that character. START is the index into string at which we - begin. This is similar in spirit to strpbrk, but it returns an index into - STRING and takes a starting index. This little piece of code knows quite - a lot of shell syntax. It's very similar to skip_double_quoted and other - functions of that ilk. */ -int -skip_to_delim (string, start, delims, flags) - char *string; - int start; - char *delims; - int flags; -{ - int i, pass_next, backq, si, c, invert, skipquote, skipcmd; - size_t slen; - char *temp, open[3]; - DECLARE_MBSTATE; - - slen = strlen (string + start) + start; - if (flags & SD_NOJMP) - no_longjmp_on_fatal_error = 1; - invert = (flags & SD_INVERT); - skipcmd = (flags & SD_NOSKIPCMD) == 0; - - i = start; - pass_next = backq = 0; - while (c = string[i]) - { - /* If this is non-zero, we should not let quote characters be delimiters - and the current character is a single or double quote. We should not - test whether or not it's a delimiter until after we skip single- or - double-quoted strings. */ - skipquote = ((flags & SD_NOQUOTEDELIM) && (c == '\'' || c =='"')); - if (pass_next) - { - pass_next = 0; - if (c == 0) - CQ_RETURN(i); - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '\\') - { - pass_next = 1; - i++; - continue; - } - else if (backq) - { - if (c == '`') - backq = 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '`') - { - backq = 1; - i++; - continue; - } - else if (skipquote == 0 && invert == 0 && member (c, delims)) - break; - else if (c == '\'' || c == '"') - { - i = (c == '\'') ? skip_single_quoted (string, slen, ++i) - : skip_double_quoted (string, slen, ++i); - /* no increment, the skip functions increment past the closing quote. */ - } - else if (c == '$' && ((skipcmd && string[i+1] == LPAREN) || string[i+1] == LBRACE)) - { - si = i + 2; - if (string[si] == '\0') - CQ_RETURN(si); - - if (string[i+1] == LPAREN) - temp = extract_delimited_string (string, &si, "$(", "(", ")", SX_NOALLOC|SX_COMMAND); /* ) */ - else - temp = extract_dollar_brace_string (string, &si, 0, SX_NOALLOC); - i = si; - if (string[i] == '\0') /* don't increment i past EOS in loop */ - break; - i++; - continue; - } -#if defined (PROCESS_SUBSTITUTION) - else if (skipcmd && (c == '<' || c == '>') && string[i+1] == LPAREN) - { - si = i + 2; - if (string[si] == '\0') - CQ_RETURN(si); - temp = extract_process_subst (string, (c == '<') ? "<(" : ">(", &si); - free (temp); /* no SX_ALLOC here */ - i = si; - if (string[i] == '\0') - break; - i++; - continue; - } -#endif /* PROCESS_SUBSTITUTION */ -#if defined (EXTENDED_GLOB) - else if ((flags & SD_EXTGLOB) && extended_glob && string[i+1] == LPAREN && member (c, "?*+!@")) - { - si = i + 2; - if (string[si] == '\0') - CQ_RETURN(si); - - open[0] = c; - open[1] = LPAREN; - open[2] = '\0'; - temp = extract_delimited_string (string, &si, open, "(", ")", SX_NOALLOC); /* ) */ - - i = si; - if (string[i] == '\0') /* don't increment i past EOS in loop */ - break; - i++; - continue; - } -#endif - else if ((skipquote || invert) && (member (c, delims) == 0)) - break; - else - ADVANCE_CHAR (string, slen, i); - } - - CQ_RETURN(i); -} - -#if defined (READLINE) -/* Return 1 if the portion of STRING ending at EINDEX is quoted (there is - an unclosed quoted string), or if the character at EINDEX is quoted - by a backslash. NO_LONGJMP_ON_FATAL_ERROR is used to flag that the various - single and double-quoted string parsing functions should not return an - error if there are unclosed quotes or braces. The characters that this - recognizes need to be the same as the contents of - rl_completer_quote_characters. */ - -int -char_is_quoted (string, eindex) - char *string; - int eindex; -{ - int i, pass_next, c; - size_t slen; - DECLARE_MBSTATE; - - slen = strlen (string); - no_longjmp_on_fatal_error = 1; - i = pass_next = 0; - while (i <= eindex) - { - c = string[i]; - - if (pass_next) - { - pass_next = 0; - if (i >= eindex) /* XXX was if (i >= eindex - 1) */ - CQ_RETURN(1); - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (c == '\\') - { - pass_next = 1; - i++; - continue; - } - else if (c == '\'' || c == '"') - { - i = (c == '\'') ? skip_single_quoted (string, slen, ++i) - : skip_double_quoted (string, slen, ++i); - if (i > eindex) - CQ_RETURN(1); - /* no increment, the skip_xxx functions go one past end */ - } - else - ADVANCE_CHAR (string, slen, i); - } - - CQ_RETURN(0); -} - -int -unclosed_pair (string, eindex, openstr) - char *string; - int eindex; - char *openstr; -{ - int i, pass_next, openc, olen; - size_t slen; - DECLARE_MBSTATE; - - slen = strlen (string); - olen = strlen (openstr); - i = pass_next = openc = 0; - while (i <= eindex) - { - if (pass_next) - { - pass_next = 0; - if (i >= eindex) /* XXX was if (i >= eindex - 1) */ - return 0; - ADVANCE_CHAR (string, slen, i); - continue; - } - else if (string[i] == '\\') - { - pass_next = 1; - i++; - continue; - } - else if (STREQN (string + i, openstr, olen)) - { - openc = 1 - openc; - i += olen; - } - else if (string[i] == '\'' || string[i] == '"') - { - i = (string[i] == '\'') ? skip_single_quoted (string, slen, i) - : skip_double_quoted (string, slen, i); - if (i > eindex) - return 0; - } - else - ADVANCE_CHAR (string, slen, i); - } - return (openc); -} - -/* Split STRING (length SLEN) at DELIMS, and return a WORD_LIST with the - individual words. If DELIMS is NULL, the current value of $IFS is used - to split the string, and the function follows the shell field splitting - rules. SENTINEL is an index to look for. NWP, if non-NULL, - gets the number of words in the returned list. CWP, if non-NULL, gets - the index of the word containing SENTINEL. Non-whitespace chars in - DELIMS delimit separate fields. */ -WORD_LIST * -split_at_delims (string, slen, delims, sentinel, flags, nwp, cwp) - char *string; - int slen; - char *delims; - int sentinel, flags; - int *nwp, *cwp; -{ - int ts, te, i, nw, cw, ifs_split, dflags; - char *token, *d, *d2; - WORD_LIST *ret, *tl; - - if (string == 0 || *string == '\0') - { - if (nwp) - *nwp = 0; - if (cwp) - *cwp = 0; - return ((WORD_LIST *)NULL); - } - - d = (delims == 0) ? ifs_value : delims; - ifs_split = delims == 0; - - /* Make d2 the non-whitespace characters in delims */ - d2 = 0; - if (delims) - { - size_t slength; -#if defined (HANDLE_MULTIBYTE) - size_t mblength = 1; -#endif - DECLARE_MBSTATE; - - slength = strlen (delims); - d2 = (char *)xmalloc (slength + 1); - i = ts = 0; - while (delims[i]) - { -#if defined (HANDLE_MULTIBYTE) - mbstate_t state_bak; - state_bak = state; - mblength = MBRLEN (delims + i, slength, &state); - if (MB_INVALIDCH (mblength)) - state = state_bak; - else if (mblength > 1) - { - memcpy (d2 + ts, delims + i, mblength); - ts += mblength; - i += mblength; - slength -= mblength; - continue; - } -#endif - if (whitespace (delims[i]) == 0) - d2[ts++] = delims[i]; - - i++; - slength--; - } - d2[ts] = '\0'; - } - - ret = (WORD_LIST *)NULL; - - /* Remove sequences of whitespace characters at the start of the string, as - long as those characters are delimiters. */ - for (i = 0; member (string[i], d) && spctabnl (string[i]); i++) - ; - if (string[i] == '\0') - return (ret); - - ts = i; - nw = 0; - cw = -1; - dflags = flags|SD_NOJMP; - while (1) - { - te = skip_to_delim (string, ts, d, dflags); - - /* If we have a non-whitespace delimiter character, use it to make a - separate field. This is just about what $IFS splitting does and - is closer to the behavior of the shell parser. */ - if (ts == te && d2 && member (string[ts], d2)) - { - te = ts + 1; - /* If we're using IFS splitting, the non-whitespace delimiter char - and any additional IFS whitespace delimits a field. */ - if (ifs_split) - while (member (string[te], d) && spctabnl (string[te])) - te++; - else - while (member (string[te], d2)) - te++; - } - - token = substring (string, ts, te); - - ret = add_string_to_list (token, ret); - free (token); - nw++; - - if (sentinel >= ts && sentinel <= te) - cw = nw; - - /* If the cursor is at whitespace just before word start, set the - sentinel word to the current word. */ - if (cwp && cw == -1 && sentinel == ts-1) - cw = nw; - - /* If the cursor is at whitespace between two words, make a new, empty - word, add it before (well, after, since the list is in reverse order) - the word we just added, and set the current word to that one. */ - if (cwp && cw == -1 && sentinel < ts) - { - tl = make_word_list (make_word (""), ret->next); - ret->next = tl; - cw = nw; - nw++; - } - - if (string[te] == 0) - break; - - i = te; - while (member (string[i], d) && (ifs_split || spctabnl(string[i]))) - i++; - - if (string[i]) - ts = i; - else - break; - } - - /* Special case for SENTINEL at the end of STRING. If we haven't found - the word containing SENTINEL yet, and the index we're looking for is at - the end of STRING (or past the end of the previously-found token, - possible if the end of the line is composed solely of IFS whitespace) - add an additional null argument and set the current word pointer to that. */ - if (cwp && cw == -1 && (sentinel >= slen || sentinel >= te)) - { - if (whitespace (string[sentinel - 1])) - { - token = ""; - ret = add_string_to_list (token, ret); - nw++; - } - cw = nw; - } - - if (nwp) - *nwp = nw; - if (cwp) - *cwp = cw; - - FREE (d2); - - return (REVERSE_LIST (ret, WORD_LIST *)); -} -#endif /* READLINE */ - -#if 0 -/* UNUSED */ -/* Extract the name of the variable to bind to from the assignment string. */ -char * -assignment_name (string) - char *string; -{ - int offset; - char *temp; - - offset = assignment (string, 0); - if (offset == 0) - return (char *)NULL; - temp = substring (string, 0, offset); - return (temp); -} -#endif - -/* **************************************************************** */ -/* */ -/* Functions to convert strings to WORD_LISTs and vice versa */ -/* */ -/* **************************************************************** */ - -/* Return a single string of all the words in LIST. SEP is the separator - to put between individual elements of LIST in the output string. */ -char * -string_list_internal (list, sep) - WORD_LIST *list; - char *sep; -{ - register WORD_LIST *t; - char *result, *r; - int word_len, sep_len, result_size; - - if (list == 0) - return ((char *)NULL); - - /* Short-circuit quickly if we don't need to separate anything. */ - if (list->next == 0) - return (savestring (list->word->word)); - - /* This is nearly always called with either sep[0] == 0 or sep[1] == 0. */ - sep_len = STRLEN (sep); - result_size = 0; - - for (t = list; t; t = t->next) - { - if (t != list) - result_size += sep_len; - result_size += strlen (t->word->word); - } - - r = result = (char *)xmalloc (result_size + 1); - - for (t = list; t; t = t->next) - { - if (t != list && sep_len) - { - if (sep_len > 1) - { - FASTCOPY (sep, r, sep_len); - r += sep_len; - } - else - *r++ = sep[0]; - } - - word_len = strlen (t->word->word); - FASTCOPY (t->word->word, r, word_len); - r += word_len; - } - - *r = '\0'; - return (result); -} - -/* Return a single string of all the words present in LIST, separating - each word with a space. */ -char * -string_list (list) - WORD_LIST *list; -{ - return (string_list_internal (list, " ")); -} - -/* An external interface that can be used by the rest of the shell to - obtain a string containing the first character in $IFS. Handles all - the multibyte complications. If LENP is non-null, it is set to the - length of the returned string. */ -char * -ifs_firstchar (lenp) - int *lenp; -{ - char *ret; - int len; - - ret = xmalloc (MB_LEN_MAX + 1); -#if defined (HANDLE_MULTIBYTE) - if (ifs_firstc_len == 1) - { - ret[0] = ifs_firstc[0]; - ret[1] = '\0'; - len = ret[0] ? 1 : 0; - } - else - { - memcpy (ret, ifs_firstc, ifs_firstc_len); - ret[len = ifs_firstc_len] = '\0'; - } -#else - ret[0] = ifs_firstc; - ret[1] = '\0'; - len = ret[0] ? 0 : 1; -#endif - - if (lenp) - *lenp = len; - - return ret; -} - -/* Return a single string of all the words present in LIST, obeying the - quoting rules for "$*", to wit: (P1003.2, draft 11, 3.5.2) "If the - expansion [of $*] appears within a double quoted string, it expands - to a single field with the value of each parameter separated by the - first character of the IFS variable, or by a <space> if IFS is unset." */ -char * -string_list_dollar_star (list) - WORD_LIST *list; -{ - char *ret; -#if defined (HANDLE_MULTIBYTE) -# if defined (__GNUC__) - char sep[MB_CUR_MAX + 1]; -# else - char *sep = 0; -# endif -#else - char sep[2]; -#endif - -#if defined (HANDLE_MULTIBYTE) -# if !defined (__GNUC__) - sep = (char *)xmalloc (MB_CUR_MAX + 1); -# endif /* !__GNUC__ */ - if (ifs_firstc_len == 1) - { - sep[0] = ifs_firstc[0]; - sep[1] = '\0'; - } - else - { - memcpy (sep, ifs_firstc, ifs_firstc_len); - sep[ifs_firstc_len] = '\0'; - } -#else - sep[0] = ifs_firstc; - sep[1] = '\0'; -#endif - - ret = string_list_internal (list, sep); -#if defined (HANDLE_MULTIBYTE) && !defined (__GNUC__) - free (sep); -#endif - return ret; -} - -/* Turn $@ into a string. If (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - is non-zero, the $@ appears within double quotes, and we should quote - the list before converting it into a string. If IFS is unset, and the - word is not quoted, we just need to quote CTLESC and CTLNUL characters - in the words in the list, because the default value of $IFS is - <space><tab><newline>, IFS characters in the words in the list should - also be split. If IFS is null, and the word is not quoted, we need - to quote the words in the list to preserve the positional parameters - exactly. */ -char * -string_list_dollar_at (list, quoted) - WORD_LIST *list; - int quoted; -{ - char *ifs, *ret; -#if defined (HANDLE_MULTIBYTE) -# if defined (__GNUC__) - char sep[MB_CUR_MAX + 1]; -# else - char *sep = 0; -# endif /* !__GNUC__ */ -#else - char sep[2]; -#endif - WORD_LIST *tlist; - - /* XXX this could just be ifs = ifs_value; */ - ifs = ifs_var ? value_cell (ifs_var) : (char *)0; - -#if defined (HANDLE_MULTIBYTE) -# if !defined (__GNUC__) - sep = (char *)xmalloc (MB_CUR_MAX + 1); -# endif /* !__GNUC__ */ - if (ifs && *ifs) - { - if (ifs_firstc_len == 1) - { - sep[0] = ifs_firstc[0]; - sep[1] = '\0'; - } - else - { - memcpy (sep, ifs_firstc, ifs_firstc_len); - sep[ifs_firstc_len] = '\0'; - } - } - else - { - sep[0] = ' '; - sep[1] = '\0'; - } -#else - sep[0] = (ifs == 0 || *ifs == 0) ? ' ' : *ifs; - sep[1] = '\0'; -#endif - - /* XXX -- why call quote_list if ifs == 0? we can get away without doing - it now that quote_escapes quotes spaces */ - tlist = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES|Q_PATQUOTE)) - ? quote_list (list) - : list_quote_escapes (list); - - ret = string_list_internal (tlist, sep); -#if defined (HANDLE_MULTIBYTE) && !defined (__GNUC__) - free (sep); -#endif - return ret; -} - -/* Turn the positional paramters into a string, understanding quoting and - the various subtleties of using the first character of $IFS as the - separator. Calls string_list_dollar_at, string_list_dollar_star, and - string_list as appropriate. */ -char * -string_list_pos_params (pchar, list, quoted) - int pchar; - WORD_LIST *list; - int quoted; -{ - char *ret; - WORD_LIST *tlist; - - if (pchar == '*' && (quoted & Q_DOUBLE_QUOTES)) - { - tlist = quote_list (list); - word_list_remove_quoted_nulls (tlist); - ret = string_list_dollar_star (tlist); - } - else if (pchar == '*' && (quoted & Q_HERE_DOCUMENT)) - { - tlist = quote_list (list); - word_list_remove_quoted_nulls (tlist); - ret = string_list (tlist); - } - else if (pchar == '*') - { - /* Even when unquoted, string_list_dollar_star does the right thing - making sure that the first character of $IFS is used as the - separator. */ - ret = string_list_dollar_star (list); - } - else if (pchar == '@' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - /* We use string_list_dollar_at, but only if the string is quoted, since - that quotes the escapes if it's not, which we don't want. We could - use string_list (the old code did), but that doesn't do the right - thing if the first character of $IFS is not a space. We use - string_list_dollar_star if the string is unquoted so we make sure that - the elements of $@ are separated by the first character of $IFS for - later splitting. */ - ret = string_list_dollar_at (list, quoted); - else if (pchar == '@') - ret = string_list_dollar_star (list); - else - ret = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (list) : list); - - return ret; -} - -/* Return the list of words present in STRING. Separate the string into - words at any of the characters found in SEPARATORS. If QUOTED is - non-zero then word in the list will have its quoted flag set, otherwise - the quoted flag is left as make_word () deemed fit. - - This obeys the P1003.2 word splitting semantics. If `separators' is - exactly <space><tab><newline>, then the splitting algorithm is that of - the Bourne shell, which treats any sequence of characters from `separators' - as a delimiter. If IFS is unset, which results in `separators' being set - to "", no splitting occurs. If separators has some other value, the - following rules are applied (`IFS white space' means zero or more - occurrences of <space>, <tab>, or <newline>, as long as those characters - are in `separators'): - - 1) IFS white space is ignored at the start and the end of the - string. - 2) Each occurrence of a character in `separators' that is not - IFS white space, along with any adjacent occurrences of - IFS white space delimits a field. - 3) Any nonzero-length sequence of IFS white space delimits a field. - */ - -/* BEWARE! list_string strips null arguments. Don't call it twice and - expect to have "" preserved! */ - -/* This performs word splitting and quoted null character removal on - STRING. */ -#define issep(c) \ - (((separators)[0]) ? ((separators)[1] ? isifs(c) \ - : (c) == (separators)[0]) \ - : 0) - -WORD_LIST * -list_string (string, separators, quoted) - register char *string, *separators; - int quoted; -{ - WORD_LIST *result; - WORD_DESC *t; - char *current_word, *s; - int sindex, sh_style_split, whitesep, xflags; - size_t slen; - - if (!string || !*string) - return ((WORD_LIST *)NULL); - - sh_style_split = separators && separators[0] == ' ' && - separators[1] == '\t' && - separators[2] == '\n' && - separators[3] == '\0'; - for (xflags = 0, s = ifs_value; s && *s; s++) - { - if (*s == CTLESC) xflags |= SX_NOCTLESC; - else if (*s == CTLNUL) xflags |= SX_NOESCCTLNUL; - } - - slen = 0; - /* Remove sequences of whitespace at the beginning of STRING, as - long as those characters appear in IFS. Do not do this if - STRING is quoted or if there are no separator characters. */ - if (!quoted || !separators || !*separators) - { - for (s = string; *s && spctabnl (*s) && issep (*s); s++); - - if (!*s) - return ((WORD_LIST *)NULL); - - string = s; - } - - /* OK, now STRING points to a word that does not begin with white space. - The splitting algorithm is: - extract a word, stopping at a separator - skip sequences of spc, tab, or nl as long as they are separators - This obeys the field splitting rules in Posix.2. */ - slen = (MB_CUR_MAX > 1) ? strlen (string) : 1; - for (result = (WORD_LIST *)NULL, sindex = 0; string[sindex]; ) - { - /* Don't need string length in ADVANCE_CHAR or string_extract_verbatim - unless multibyte chars are possible. */ - current_word = string_extract_verbatim (string, slen, &sindex, separators, xflags); - if (current_word == 0) - break; - - /* If we have a quoted empty string, add a quoted null argument. We - want to preserve the quoted null character iff this is a quoted - empty string; otherwise the quoted null characters are removed - below. */ - if (QUOTED_NULL (current_word)) - { - t = alloc_word_desc (); - t->word = make_quoted_char ('\0'); - t->flags |= W_QUOTED|W_HASQUOTEDNULL; - result = make_word_list (t, result); - } - else if (current_word[0] != '\0') - { - /* If we have something, then add it regardless. However, - perform quoted null character removal on the current word. */ - remove_quoted_nulls (current_word); - result = add_string_to_list (current_word, result); - result->word->flags &= ~W_HASQUOTEDNULL; /* just to be sure */ - if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) - result->word->flags |= W_QUOTED; - } - - /* If we're not doing sequences of separators in the traditional - Bourne shell style, then add a quoted null argument. */ - else if (!sh_style_split && !spctabnl (string[sindex])) - { - t = alloc_word_desc (); - t->word = make_quoted_char ('\0'); - t->flags |= W_QUOTED|W_HASQUOTEDNULL; - result = make_word_list (t, result); - } - - free (current_word); - - /* Note whether or not the separator is IFS whitespace, used later. */ - whitesep = string[sindex] && spctabnl (string[sindex]); - - /* Move past the current separator character. */ - if (string[sindex]) - { - DECLARE_MBSTATE; - ADVANCE_CHAR (string, slen, sindex); - } - - /* Now skip sequences of space, tab, or newline characters if they are - in the list of separators. */ - while (string[sindex] && spctabnl (string[sindex]) && issep (string[sindex])) - sindex++; - - /* If the first separator was IFS whitespace and the current character - is a non-whitespace IFS character, it should be part of the current - field delimiter, not a separate delimiter that would result in an - empty field. Look at POSIX.2, 3.6.5, (3)(b). */ - if (string[sindex] && whitesep && issep (string[sindex]) && !spctabnl (string[sindex])) - { - sindex++; - /* An IFS character that is not IFS white space, along with any - adjacent IFS white space, shall delimit a field. (SUSv3) */ - while (string[sindex] && spctabnl (string[sindex]) && isifs (string[sindex])) - sindex++; - } - } - return (REVERSE_LIST (result, WORD_LIST *)); -} - -/* Parse a single word from STRING, using SEPARATORS to separate fields. - ENDPTR is set to the first character after the word. This is used by - the `read' builtin. This is never called with SEPARATORS != $IFS; - it should be simplified. - - XXX - this function is very similar to list_string; they should be - combined - XXX */ -char * -get_word_from_string (stringp, separators, endptr) - char **stringp, *separators, **endptr; -{ - register char *s; - char *current_word; - int sindex, sh_style_split, whitesep, xflags; - size_t slen; - - if (!stringp || !*stringp || !**stringp) - return ((char *)NULL); - - sh_style_split = separators && separators[0] == ' ' && - separators[1] == '\t' && - separators[2] == '\n' && - separators[3] == '\0'; - for (xflags = 0, s = ifs_value; s && *s; s++) - { - if (*s == CTLESC) xflags |= SX_NOCTLESC; - if (*s == CTLNUL) xflags |= SX_NOESCCTLNUL; - } - - s = *stringp; - slen = 0; - - /* Remove sequences of whitespace at the beginning of STRING, as - long as those characters appear in IFS. */ - if (sh_style_split || !separators || !*separators) - { - for (; *s && spctabnl (*s) && isifs (*s); s++); - - /* If the string is nothing but whitespace, update it and return. */ - if (!*s) - { - *stringp = s; - if (endptr) - *endptr = s; - return ((char *)NULL); - } - } - - /* OK, S points to a word that does not begin with white space. - Now extract a word, stopping at a separator, save a pointer to - the first character after the word, then skip sequences of spc, - tab, or nl as long as they are separators. - - This obeys the field splitting rules in Posix.2. */ - sindex = 0; - /* Don't need string length in ADVANCE_CHAR or string_extract_verbatim - unless multibyte chars are possible. */ - slen = (MB_CUR_MAX > 1) ? strlen (s) : 1; - current_word = string_extract_verbatim (s, slen, &sindex, separators, xflags); - - /* Set ENDPTR to the first character after the end of the word. */ - if (endptr) - *endptr = s + sindex; - - /* Note whether or not the separator is IFS whitespace, used later. */ - whitesep = s[sindex] && spctabnl (s[sindex]); - - /* Move past the current separator character. */ - if (s[sindex]) - { - DECLARE_MBSTATE; - ADVANCE_CHAR (s, slen, sindex); - } - - /* Now skip sequences of space, tab, or newline characters if they are - in the list of separators. */ - while (s[sindex] && spctabnl (s[sindex]) && isifs (s[sindex])) - sindex++; - - /* If the first separator was IFS whitespace and the current character is - a non-whitespace IFS character, it should be part of the current field - delimiter, not a separate delimiter that would result in an empty field. - Look at POSIX.2, 3.6.5, (3)(b). */ - if (s[sindex] && whitesep && isifs (s[sindex]) && !spctabnl (s[sindex])) - { - sindex++; - /* An IFS character that is not IFS white space, along with any adjacent - IFS white space, shall delimit a field. */ - while (s[sindex] && spctabnl (s[sindex]) && isifs (s[sindex])) - sindex++; - } - - /* Update STRING to point to the next field. */ - *stringp = s + sindex; - return (current_word); -} - -/* Remove IFS white space at the end of STRING. Start at the end - of the string and walk backwards until the beginning of the string - or we find a character that's not IFS white space and not CTLESC. - Only let CTLESC escape a white space character if SAW_ESCAPE is - non-zero. */ -char * -strip_trailing_ifs_whitespace (string, separators, saw_escape) - char *string, *separators; - int saw_escape; -{ - char *s; - - s = string + STRLEN (string) - 1; - while (s > string && ((spctabnl (*s) && isifs (*s)) || - (saw_escape && *s == CTLESC && spctabnl (s[1])))) - s--; - *++s = '\0'; - return string; -} - -#if 0 -/* UNUSED */ -/* Split STRING into words at whitespace. Obeys shell-style quoting with - backslashes, single and double quotes. */ -WORD_LIST * -list_string_with_quotes (string) - char *string; -{ - WORD_LIST *list; - char *token, *s; - size_t s_len; - int c, i, tokstart, len; - - for (s = string; s && *s && spctabnl (*s); s++) - ; - if (s == 0 || *s == 0) - return ((WORD_LIST *)NULL); - - s_len = strlen (s); - tokstart = i = 0; - list = (WORD_LIST *)NULL; - while (1) - { - c = s[i]; - if (c == '\\') - { - i++; - if (s[i]) - i++; - } - else if (c == '\'') - i = skip_single_quoted (s, s_len, ++i); - else if (c == '"') - i = skip_double_quoted (s, s_len, ++i); - else if (c == 0 || spctabnl (c)) - { - /* We have found the end of a token. Make a word out of it and - add it to the word list. */ - token = substring (s, tokstart, i); - list = add_string_to_list (token, list); - free (token); - while (spctabnl (s[i])) - i++; - if (s[i]) - tokstart = i; - else - break; - } - else - i++; /* normal character */ - } - return (REVERSE_LIST (list, WORD_LIST *)); -} -#endif - -/********************************************************/ -/* */ -/* Functions to perform assignment statements */ -/* */ -/********************************************************/ - -#if defined (ARRAY_VARS) -static SHELL_VAR * -do_compound_assignment (name, value, flags) - char *name, *value; - int flags; -{ - SHELL_VAR *v; - int mklocal, mkassoc, mkglobal; - WORD_LIST *list; - - mklocal = flags & ASS_MKLOCAL; - mkassoc = flags & ASS_MKASSOC; - mkglobal = flags & ASS_MKGLOBAL; - - if (mklocal && variable_context) - { - v = find_variable (name); - list = expand_compound_array_assignment (v, value, flags); - if (mkassoc) - v = make_local_assoc_variable (name); - else if (v == 0 || (array_p (v) == 0 && assoc_p (v) == 0) || v->context != variable_context) - v = make_local_array_variable (name, 0); - if (v) - assign_compound_array_list (v, list, flags); - } - /* In a function but forcing assignment in global context */ - else if (mkglobal && variable_context) - { - v = find_global_variable (name); - list = expand_compound_array_assignment (v, value, flags); - if (v == 0 && mkassoc) - v = make_new_assoc_variable (name); - else if (v && mkassoc && assoc_p (v) == 0) - v = convert_var_to_assoc (v); - else if (v == 0) - v = make_new_array_variable (name); - else if (v && mkassoc == 0 && array_p (v) == 0) - v = convert_var_to_array (v); - if (v) - assign_compound_array_list (v, list, flags); - } - else - v = assign_array_from_string (name, value, flags); - - return (v); -} -#endif - -/* Given STRING, an assignment string, get the value of the right side - of the `=', and bind it to the left side. If EXPAND is true, then - perform parameter expansion, command substitution, and arithmetic - expansion on the right-hand side. Perform tilde expansion in any - case. Do not perform word splitting on the result of expansion. */ -static int -do_assignment_internal (word, expand) - const WORD_DESC *word; - int expand; -{ - int offset, appendop, assign_list, aflags, retval; - char *name, *value, *temp; - SHELL_VAR *entry; -#if defined (ARRAY_VARS) - char *t; - int ni; -#endif - const char *string; - - if (word == 0 || word->word == 0) - return 0; - - appendop = assign_list = aflags = 0; - string = word->word; - offset = assignment (string, 0); - name = savestring (string); - value = (char *)NULL; - - if (name[offset] == '=') - { - if (name[offset - 1] == '+') - { - appendop = 1; - name[offset - 1] = '\0'; - } - - name[offset] = 0; /* might need this set later */ - temp = name + offset + 1; - -#if defined (ARRAY_VARS) - if (expand && (word->flags & W_COMPASSIGN)) - { - assign_list = ni = 1; - value = extract_array_assignment_list (temp, &ni); - } - else -#endif - if (expand && temp[0]) - value = expand_string_if_necessary (temp, 0, expand_string_assignment); - else - value = savestring (temp); - } - - if (value == 0) - { - value = (char *)xmalloc (1); - value[0] = '\0'; - } - - if (echo_command_at_execute) - { - if (appendop) - name[offset - 1] = '+'; - xtrace_print_assignment (name, value, assign_list, 1); - if (appendop) - name[offset - 1] = '\0'; - } - -#define ASSIGN_RETURN(r) do { FREE (value); free (name); return (r); } while (0) - - if (appendop) - aflags |= ASS_APPEND; - -#if defined (ARRAY_VARS) - if (t = mbschr (name, '[')) /*]*/ - { - if (assign_list) - { - report_error (_("%s: cannot assign list to array member"), name); - ASSIGN_RETURN (0); - } - entry = assign_array_element (name, value, aflags); - if (entry == 0) - ASSIGN_RETURN (0); - } - else if (assign_list) - { - if ((word->flags & W_ASSIGNARG) && (word->flags & W_ASSNGLOBAL) == 0) - aflags |= ASS_MKLOCAL; - if ((word->flags & W_ASSIGNARG) && (word->flags & W_ASSNGLOBAL)) - aflags |= ASS_MKGLOBAL; - if (word->flags & W_ASSIGNASSOC) - aflags |= ASS_MKASSOC; - entry = do_compound_assignment (name, value, aflags); - } - else -#endif /* ARRAY_VARS */ - entry = bind_variable (name, value, aflags); - - stupidly_hack_special_variables (name); - - /* Return 1 if the assignment seems to have been performed correctly. */ - if (entry == 0 || readonly_p (entry)) - retval = 0; /* assignment failure */ - else if (noassign_p (entry)) - { - last_command_exit_value = EXECUTION_FAILURE; - retval = 1; /* error status, but not assignment failure */ - } - else - retval = 1; - - if (entry && retval != 0 && noassign_p (entry) == 0) - VUNSETATTR (entry, att_invisible); - - ASSIGN_RETURN (retval); -} - -/* Perform the assignment statement in STRING, and expand the - right side by doing tilde, command and parameter expansion. */ -int -do_assignment (string) - char *string; -{ - WORD_DESC td; - - td.flags = W_ASSIGNMENT; - td.word = string; - - return do_assignment_internal (&td, 1); -} - -int -do_word_assignment (word, flags) - WORD_DESC *word; - int flags; -{ - return do_assignment_internal (word, 1); -} - -/* Given STRING, an assignment string, get the value of the right side - of the `=', and bind it to the left side. Do not perform any word - expansions on the right hand side. */ -int -do_assignment_no_expand (string) - char *string; -{ - WORD_DESC td; - - td.flags = W_ASSIGNMENT; - td.word = string; - - return (do_assignment_internal (&td, 0)); -} - -/*************************************************** - * * - * Functions to manage the positional parameters * - * * - ***************************************************/ - -/* Return the word list that corresponds to `$*'. */ -WORD_LIST * -list_rest_of_args () -{ - register WORD_LIST *list, *args; - int i; - - /* Break out of the loop as soon as one of the dollar variables is null. */ - for (i = 1, list = (WORD_LIST *)NULL; i < 10 && dollar_vars[i]; i++) - list = make_word_list (make_bare_word (dollar_vars[i]), list); - - for (args = rest_of_args; args; args = args->next) - list = make_word_list (make_bare_word (args->word->word), list); - - return (REVERSE_LIST (list, WORD_LIST *)); -} - -int -number_of_args () -{ - register WORD_LIST *list; - int n; - - for (n = 0; n < 9 && dollar_vars[n+1]; n++) - ; - for (list = rest_of_args; list; list = list->next) - n++; - return n; -} - -/* Return the value of a positional parameter. This handles values > 10. */ -char * -get_dollar_var_value (ind) - intmax_t ind; -{ - char *temp; - WORD_LIST *p; - - if (ind < 10) - temp = dollar_vars[ind] ? savestring (dollar_vars[ind]) : (char *)NULL; - else /* We want something like ${11} */ - { - ind -= 10; - for (p = rest_of_args; p && ind--; p = p->next) - ; - temp = p ? savestring (p->word->word) : (char *)NULL; - } - return (temp); -} - -/* Make a single large string out of the dollar digit variables, - and the rest_of_args. If DOLLAR_STAR is 1, then obey the special - case of "$*" with respect to IFS. */ -char * -string_rest_of_args (dollar_star) - int dollar_star; -{ - register WORD_LIST *list; - char *string; - - list = list_rest_of_args (); - string = dollar_star ? string_list_dollar_star (list) : string_list (list); - dispose_words (list); - return (string); -} - -/* Return a string containing the positional parameters from START to - END, inclusive. If STRING[0] == '*', we obey the rules for $*, - which only makes a difference if QUOTED is non-zero. If QUOTED includes - Q_HERE_DOCUMENT or Q_DOUBLE_QUOTES, this returns a quoted list, otherwise - no quoting chars are added. */ -static char * -pos_params (string, start, end, quoted) - char *string; - int start, end, quoted; -{ - WORD_LIST *save, *params, *h, *t; - char *ret; - int i; - - /* see if we can short-circuit. if start == end, we want 0 parameters. */ - if (start == end) - return ((char *)NULL); - - save = params = list_rest_of_args (); - if (save == 0) - return ((char *)NULL); - - if (start == 0) /* handle ${@:0[:x]} specially */ - { - t = make_word_list (make_word (dollar_vars[0]), params); - save = params = t; - } - - for (i = start ? 1 : 0; params && i < start; i++) - params = params->next; - if (params == 0) - return ((char *)NULL); - for (h = t = params; params && i < end; i++) - { - t = params; - params = params->next; - } - - t->next = (WORD_LIST *)NULL; - - ret = string_list_pos_params (string[0], h, quoted); - - if (t != params) - t->next = params; - - dispose_words (save); - return (ret); -} - -/******************************************************************/ -/* */ -/* Functions to expand strings to strings or WORD_LISTs */ -/* */ -/******************************************************************/ - -#if defined (PROCESS_SUBSTITUTION) -#define EXP_CHAR(s) (s == '$' || s == '`' || s == '<' || s == '>' || s == CTLESC || s == '~') -#else -#define EXP_CHAR(s) (s == '$' || s == '`' || s == CTLESC || s == '~') -#endif - -/* If there are any characters in STRING that require full expansion, - then call FUNC to expand STRING; otherwise just perform quote - removal if necessary. This returns a new string. */ -static char * -expand_string_if_necessary (string, quoted, func) - char *string; - int quoted; - EXPFUNC *func; -{ - WORD_LIST *list; - size_t slen; - int i, saw_quote; - char *ret; - DECLARE_MBSTATE; - - /* Don't need string length for ADVANCE_CHAR unless multibyte chars possible. */ - slen = (MB_CUR_MAX > 1) ? strlen (string) : 0; - i = saw_quote = 0; - while (string[i]) - { - if (EXP_CHAR (string[i])) - break; - else if (string[i] == '\'' || string[i] == '\\' || string[i] == '"') - saw_quote = 1; - ADVANCE_CHAR (string, slen, i); - } - - if (string[i]) - { - list = (*func) (string, quoted); - if (list) - { - ret = string_list (list); - dispose_words (list); - } - else - ret = (char *)NULL; - } - else if (saw_quote && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0)) - ret = string_quote_removal (string, quoted); - else - ret = savestring (string); - - return ret; -} - -static inline char * -expand_string_to_string_internal (string, quoted, func) - char *string; - int quoted; - EXPFUNC *func; -{ - WORD_LIST *list; - char *ret; - - if (string == 0 || *string == '\0') - return ((char *)NULL); - - list = (*func) (string, quoted); - if (list) - { - ret = string_list (list); - dispose_words (list); - } - else - ret = (char *)NULL; - - return (ret); -} - -char * -expand_string_to_string (string, quoted) - char *string; - int quoted; -{ - return (expand_string_to_string_internal (string, quoted, expand_string)); -} - -char * -expand_string_unsplit_to_string (string, quoted) - char *string; - int quoted; -{ - return (expand_string_to_string_internal (string, quoted, expand_string_unsplit)); -} - -char * -expand_assignment_string_to_string (string, quoted) - char *string; - int quoted; -{ - return (expand_string_to_string_internal (string, quoted, expand_string_assignment)); -} - -char * -expand_arith_string (string, quoted) - char *string; - int quoted; -{ - return (expand_string_if_necessary (string, quoted, expand_string)); -} - -#if defined (COND_COMMAND) -/* Just remove backslashes in STRING. Returns a new string. */ -char * -remove_backslashes (string) - char *string; -{ - char *r, *ret, *s; - - r = ret = (char *)xmalloc (strlen (string) + 1); - for (s = string; s && *s; ) - { - if (*s == '\\') - s++; - if (*s == 0) - break; - *r++ = *s++; - } - *r = '\0'; - return ret; -} - -/* This needs better error handling. */ -/* Expand W for use as an argument to a unary or binary operator in a - [[...]] expression. If SPECIAL is 1, this is the rhs argument - to the != or == operator, and should be treated as a pattern. In - this case, we quote the string specially for the globbing code. If - SPECIAL is 2, this is an rhs argument for the =~ operator, and should - be quoted appropriately for regcomp/regexec. The caller is responsible - for removing the backslashes if the unquoted word is needed later. */ -char * -cond_expand_word (w, special) - WORD_DESC *w; - int special; -{ - char *r, *p; - WORD_LIST *l; - int qflags; - - if (w->word == 0 || w->word[0] == '\0') - return ((char *)NULL); - - w->flags |= W_NOSPLIT2; - l = call_expand_word_internal (w, 0, 0, (int *)0, (int *)0); - if (l) - { - if (special == 0) - { - dequote_list (l); - r = string_list (l); - } - else - { - qflags = QGLOB_CVTNULL; - if (special == 2) - qflags |= QGLOB_REGEXP; - p = string_list (l); - r = quote_string_for_globbing (p, qflags); - free (p); - } - dispose_words (l); - } - else - r = (char *)NULL; - - return r; -} -#endif - -/* Call expand_word_internal to expand W and handle error returns. - A convenience function for functions that don't want to handle - any errors or free any memory before aborting. */ -static WORD_LIST * -call_expand_word_internal (w, q, i, c, e) - WORD_DESC *w; - int q, i, *c, *e; -{ - WORD_LIST *result; - - result = expand_word_internal (w, q, i, c, e); - if (result == &expand_word_error || result == &expand_word_fatal) - { - /* By convention, each time this error is returned, w->word has - already been freed (it sometimes may not be in the fatal case, - but that doesn't result in a memory leak because we're going - to exit in most cases). */ - w->word = (char *)NULL; - last_command_exit_value = EXECUTION_FAILURE; - exp_jump_to_top_level ((result == &expand_word_error) ? DISCARD : FORCE_EOF); - /* NOTREACHED */ - } - else - return (result); -} - -/* Perform parameter expansion, command substitution, and arithmetic - expansion on STRING, as if it were a word. Leave the result quoted. - Since this does not perform word splitting, it leaves quoted nulls - in the result. */ -static WORD_LIST * -expand_string_internal (string, quoted) - char *string; - int quoted; -{ - WORD_DESC td; - WORD_LIST *tresult; - - if (string == 0 || *string == 0) - return ((WORD_LIST *)NULL); - - td.flags = 0; - td.word = savestring (string); - - tresult = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); - - FREE (td.word); - return (tresult); -} - -/* Expand STRING by performing parameter expansion, command substitution, - and arithmetic expansion. Dequote the resulting WORD_LIST before - returning it, but do not perform word splitting. The call to - remove_quoted_nulls () is in here because word splitting normally - takes care of quote removal. */ -WORD_LIST * -expand_string_unsplit (string, quoted) - char *string; - int quoted; -{ - WORD_LIST *value; - - if (string == 0 || *string == '\0') - return ((WORD_LIST *)NULL); - - expand_no_split_dollar_star = 1; - value = expand_string_internal (string, quoted); - expand_no_split_dollar_star = 0; - - if (value) - { - if (value->word) - { - remove_quoted_nulls (value->word->word); - value->word->flags &= ~W_HASQUOTEDNULL; - } - dequote_list (value); - } - return (value); -} - -/* Expand the rhs of an assignment statement */ -WORD_LIST * -expand_string_assignment (string, quoted) - char *string; - int quoted; -{ - WORD_DESC td; - WORD_LIST *value; - - if (string == 0 || *string == '\0') - return ((WORD_LIST *)NULL); - - expand_no_split_dollar_star = 1; - - td.flags = W_ASSIGNRHS; - td.word = savestring (string); - value = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); - FREE (td.word); - - expand_no_split_dollar_star = 0; - - if (value) - { - if (value->word) - { - remove_quoted_nulls (value->word->word); - value->word->flags &= ~W_HASQUOTEDNULL; - } - dequote_list (value); - } - return (value); -} - - -/* Expand one of the PS? prompt strings. This is a sort of combination of - expand_string_unsplit and expand_string_internal, but returns the - passed string when an error occurs. Might want to trap other calls - to jump_to_top_level here so we don't endlessly loop. */ -WORD_LIST * -expand_prompt_string (string, quoted, wflags) - char *string; - int quoted; - int wflags; -{ - WORD_LIST *value; - WORD_DESC td; - - if (string == 0 || *string == 0) - return ((WORD_LIST *)NULL); - - td.flags = wflags; - td.word = savestring (string); - - no_longjmp_on_fatal_error = 1; - value = expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); - no_longjmp_on_fatal_error = 0; - - if (value == &expand_word_error || value == &expand_word_fatal) - { - value = make_word_list (make_bare_word (string), (WORD_LIST *)NULL); - return value; - } - FREE (td.word); - if (value) - { - if (value->word) - { - remove_quoted_nulls (value->word->word); - value->word->flags &= ~W_HASQUOTEDNULL; - } - dequote_list (value); - } - return (value); -} - -/* Expand STRING just as if you were expanding a word, but do not dequote - the resultant WORD_LIST. This is called only from within this file, - and is used to correctly preserve quoted characters when expanding - things like ${1+"$@"}. This does parameter expansion, command - substitution, arithmetic expansion, and word splitting. */ -static WORD_LIST * -expand_string_leave_quoted (string, quoted) - char *string; - int quoted; -{ - WORD_LIST *tlist; - WORD_LIST *tresult; - - if (string == 0 || *string == '\0') - return ((WORD_LIST *)NULL); - - tlist = expand_string_internal (string, quoted); - - if (tlist) - { - tresult = word_list_split (tlist); - dispose_words (tlist); - return (tresult); - } - return ((WORD_LIST *)NULL); -} - -/* This does not perform word splitting or dequote the WORD_LIST - it returns. */ -static WORD_LIST * -expand_string_for_rhs (string, quoted, dollar_at_p, has_dollar_at) - char *string; - int quoted, *dollar_at_p, *has_dollar_at; -{ - WORD_DESC td; - WORD_LIST *tresult; - - if (string == 0 || *string == '\0') - return (WORD_LIST *)NULL; - - td.flags = W_NOSPLIT2; /* no splitting, remove "" and '' */ - td.word = string; - tresult = call_expand_word_internal (&td, quoted, 1, dollar_at_p, has_dollar_at); - return (tresult); -} - -/* Expand STRING just as if you were expanding a word. This also returns - a list of words. Note that filename globbing is *NOT* done for word - or string expansion, just when the shell is expanding a command. This - does parameter expansion, command substitution, arithmetic expansion, - and word splitting. Dequote the resultant WORD_LIST before returning. */ -WORD_LIST * -expand_string (string, quoted) - char *string; - int quoted; -{ - WORD_LIST *result; - - if (string == 0 || *string == '\0') - return ((WORD_LIST *)NULL); - - result = expand_string_leave_quoted (string, quoted); - return (result ? dequote_list (result) : result); -} - -/*************************************************** - * * - * Functions to handle quoting chars * - * * - ***************************************************/ - -/* Conventions: - - A string with s[0] == CTLNUL && s[1] == 0 is a quoted null string. - The parser passes CTLNUL as CTLESC CTLNUL. */ - -/* Quote escape characters in string s, but no other characters. This is - used to protect CTLESC and CTLNUL in variable values from the rest of - the word expansion process after the variable is expanded (word splitting - and filename generation). If IFS is null, we quote spaces as well, just - in case we split on spaces later (in the case of unquoted $@, we will - eventually attempt to split the entire word on spaces). Corresponding - code exists in dequote_escapes. Even if we don't end up splitting on - spaces, quoting spaces is not a problem. This should never be called on - a string that is quoted with single or double quotes or part of a here - document (effectively double-quoted). */ -char * -quote_escapes (string) - char *string; -{ - register char *s, *t; - size_t slen; - char *result, *send; - int quote_spaces, skip_ctlesc, skip_ctlnul; - DECLARE_MBSTATE; - - slen = strlen (string); - send = string + slen; - - quote_spaces = (ifs_value && *ifs_value == 0); - - for (skip_ctlesc = skip_ctlnul = 0, s = ifs_value; s && *s; s++) - skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL; - - t = result = (char *)xmalloc ((slen * 2) + 1); - s = string; - - while (*s) - { - if ((skip_ctlesc == 0 && *s == CTLESC) || (skip_ctlnul == 0 && *s == CTLNUL) || (quote_spaces && *s == ' ')) - *t++ = CTLESC; - COPY_CHAR_P (t, s, send); - } - *t = '\0'; - return (result); -} - -static WORD_LIST * -list_quote_escapes (list) - WORD_LIST *list; -{ - register WORD_LIST *w; - char *t; - - for (w = list; w; w = w->next) - { - t = w->word->word; - w->word->word = quote_escapes (t); - free (t); - } - return list; -} - -/* Inverse of quote_escapes; remove CTLESC protecting CTLESC or CTLNUL. - - The parser passes us CTLESC as CTLESC CTLESC and CTLNUL as CTLESC CTLNUL. - This is necessary to make unquoted CTLESC and CTLNUL characters in the - data stream pass through properly. - - We need to remove doubled CTLESC characters inside quoted strings before - quoting the entire string, so we do not double the number of CTLESC - characters. - - Also used by parts of the pattern substitution code. */ -char * -dequote_escapes (string) - char *string; -{ - register char *s, *t, *s1; - size_t slen; - char *result, *send; - int quote_spaces; - DECLARE_MBSTATE; - - if (string == 0) - return string; - - slen = strlen (string); - send = string + slen; - - t = result = (char *)xmalloc (slen + 1); - - if (strchr (string, CTLESC) == 0) - return (strcpy (result, string)); - - quote_spaces = (ifs_value && *ifs_value == 0); - - s = string; - while (*s) - { - if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL || (quote_spaces && s[1] == ' '))) - { - s++; - if (*s == '\0') - break; - } - COPY_CHAR_P (t, s, send); - } - *t = '\0'; - return result; -} - -/* Return a new string with the quoted representation of character C. - This turns "" into QUOTED_NULL, so the W_HASQUOTEDNULL flag needs to be - set in any resultant WORD_DESC where this value is the word. */ -static char * -make_quoted_char (c) - int c; -{ - char *temp; - - temp = (char *)xmalloc (3); - if (c == 0) - { - temp[0] = CTLNUL; - temp[1] = '\0'; - } - else - { - temp[0] = CTLESC; - temp[1] = c; - temp[2] = '\0'; - } - return (temp); -} - -/* Quote STRING, returning a new string. This turns "" into QUOTED_NULL, so - the W_HASQUOTEDNULL flag needs to be set in any resultant WORD_DESC where - this value is the word. */ -char * -quote_string (string) - char *string; -{ - register char *t; - size_t slen; - char *result, *send; - - if (*string == 0) - { - result = (char *)xmalloc (2); - result[0] = CTLNUL; - result[1] = '\0'; - } - else - { - DECLARE_MBSTATE; - - slen = strlen (string); - send = string + slen; - - result = (char *)xmalloc ((slen * 2) + 1); - - for (t = result; string < send; ) - { - *t++ = CTLESC; - COPY_CHAR_P (t, string, send); - } - *t = '\0'; - } - return (result); -} - -/* De-quote quoted characters in STRING. */ -char * -dequote_string (string) - char *string; -{ - register char *s, *t; - size_t slen; - char *result, *send; - DECLARE_MBSTATE; - - slen = strlen (string); - - t = result = (char *)xmalloc (slen + 1); - - if (QUOTED_NULL (string)) - { - result[0] = '\0'; - return (result); - } - - /* If no character in the string can be quoted, don't bother examining - each character. Just return a copy of the string passed to us. */ - if (strchr (string, CTLESC) == NULL) - return (strcpy (result, string)); - - send = string + slen; - s = string; - while (*s) - { - if (*s == CTLESC) - { - s++; - if (*s == '\0') - break; - } - COPY_CHAR_P (t, s, send); - } - - *t = '\0'; - return (result); -} - -/* Quote the entire WORD_LIST list. */ -static WORD_LIST * -quote_list (list) - WORD_LIST *list; -{ - register WORD_LIST *w; - char *t; - - for (w = list; w; w = w->next) - { - t = w->word->word; - w->word->word = quote_string (t); - if (*t == 0) - w->word->flags |= W_HASQUOTEDNULL; /* XXX - turn on W_HASQUOTEDNULL here? */ - w->word->flags |= W_QUOTED; - free (t); - } - return list; -} - -/* De-quote quoted characters in each word in LIST. */ -WORD_LIST * -dequote_list (list) - WORD_LIST *list; -{ - register char *s; - register WORD_LIST *tlist; - - for (tlist = list; tlist; tlist = tlist->next) - { - s = dequote_string (tlist->word->word); - if (QUOTED_NULL (tlist->word->word)) - tlist->word->flags &= ~W_HASQUOTEDNULL; - free (tlist->word->word); - tlist->word->word = s; - } - return list; -} - -/* Remove CTLESC protecting a CTLESC or CTLNUL in place. Return the passed - string. */ -char * -remove_quoted_escapes (string) - char *string; -{ - char *t; - - if (string) - { - t = dequote_escapes (string); - strcpy (string, t); - free (t); - } - - return (string); -} - -/* Perform quoted null character removal on STRING. We don't allow any - quoted null characters in the middle or at the ends of strings because - of how expand_word_internal works. remove_quoted_nulls () turns - STRING into an empty string iff it only consists of a quoted null, - and removes all unquoted CTLNUL characters. */ -char * -remove_quoted_nulls (string) - char *string; -{ - register size_t slen; - register int i, j, prev_i; - DECLARE_MBSTATE; - - if (strchr (string, CTLNUL) == 0) /* XXX */ - return string; /* XXX */ - - slen = strlen (string); - i = j = 0; - - while (i < slen) - { - if (string[i] == CTLESC) - { - /* Old code had j++, but we cannot assume that i == j at this - point -- what if a CTLNUL has already been removed from the - string? We don't want to drop the CTLESC or recopy characters - that we've already copied down. */ - i++; string[j++] = CTLESC; - if (i == slen) - break; - } - else if (string[i] == CTLNUL) - { - i++; - continue; - } - - prev_i = i; - ADVANCE_CHAR (string, slen, i); - if (j < prev_i) - { - do string[j++] = string[prev_i++]; while (prev_i < i); - } - else - j = i; - } - string[j] = '\0'; - - return (string); -} - -/* Perform quoted null character removal on each element of LIST. - This modifies LIST. */ -void -word_list_remove_quoted_nulls (list) - WORD_LIST *list; -{ - register WORD_LIST *t; - - for (t = list; t; t = t->next) - { - remove_quoted_nulls (t->word->word); - t->word->flags &= ~W_HASQUOTEDNULL; - } -} - -/* **************************************************************** */ -/* */ -/* Functions for Matching and Removing Patterns */ -/* */ -/* **************************************************************** */ - -#if defined (HANDLE_MULTIBYTE) -#if 0 /* Currently unused */ -static unsigned char * -mb_getcharlens (string, len) - char *string; - int len; -{ - int i, offset, last; - unsigned char *ret; - char *p; - DECLARE_MBSTATE; - - i = offset = 0; - last = 0; - ret = (unsigned char *)xmalloc (len); - memset (ret, 0, len); - while (string[last]) - { - ADVANCE_CHAR (string, len, offset); - ret[last] = offset - last; - last = offset; - } - return ret; -} -#endif -#endif - -/* Remove the portion of PARAM matched by PATTERN according to OP, where OP - can have one of 4 values: - RP_LONG_LEFT remove longest matching portion at start of PARAM - RP_SHORT_LEFT remove shortest matching portion at start of PARAM - RP_LONG_RIGHT remove longest matching portion at end of PARAM - RP_SHORT_RIGHT remove shortest matching portion at end of PARAM -*/ - -#define RP_LONG_LEFT 1 -#define RP_SHORT_LEFT 2 -#define RP_LONG_RIGHT 3 -#define RP_SHORT_RIGHT 4 - -/* Returns its first argument if nothing matched; new memory otherwise */ -static char * -remove_upattern (param, pattern, op) - char *param, *pattern; - int op; -{ - register int len; - register char *end; - register char *p, *ret, c; - - len = STRLEN (param); - end = param + len; - - switch (op) - { - case RP_LONG_LEFT: /* remove longest match at start */ - for (p = end; p >= param; p--) - { - c = *p; *p = '\0'; - if (strmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - *p = c; - return (savestring (p)); - } - *p = c; - - } - break; - - case RP_SHORT_LEFT: /* remove shortest match at start */ - for (p = param; p <= end; p++) - { - c = *p; *p = '\0'; - if (strmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - *p = c; - return (savestring (p)); - } - *p = c; - } - break; - - case RP_LONG_RIGHT: /* remove longest match at end */ - for (p = param; p <= end; p++) - { - if (strmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - c = *p; *p = '\0'; - ret = savestring (param); - *p = c; - return (ret); - } - } - break; - - case RP_SHORT_RIGHT: /* remove shortest match at end */ - for (p = end; p >= param; p--) - { - if (strmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - c = *p; *p = '\0'; - ret = savestring (param); - *p = c; - return (ret); - } - } - break; - } - - return (param); /* no match, return original string */ -} - -#if defined (HANDLE_MULTIBYTE) -/* Returns its first argument if nothing matched; new memory otherwise */ -static wchar_t * -remove_wpattern (wparam, wstrlen, wpattern, op) - wchar_t *wparam; - size_t wstrlen; - wchar_t *wpattern; - int op; -{ - wchar_t wc, *ret; - int n; - - switch (op) - { - case RP_LONG_LEFT: /* remove longest match at start */ - for (n = wstrlen; n >= 0; n--) - { - wc = wparam[n]; wparam[n] = L'\0'; - if (wcsmatch (wpattern, wparam, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - wparam[n] = wc; - return (wcsdup (wparam + n)); - } - wparam[n] = wc; - } - break; - - case RP_SHORT_LEFT: /* remove shortest match at start */ - for (n = 0; n <= wstrlen; n++) - { - wc = wparam[n]; wparam[n] = L'\0'; - if (wcsmatch (wpattern, wparam, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - wparam[n] = wc; - return (wcsdup (wparam + n)); - } - wparam[n] = wc; - } - break; - - case RP_LONG_RIGHT: /* remove longest match at end */ - for (n = 0; n <= wstrlen; n++) - { - if (wcsmatch (wpattern, wparam + n, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - wc = wparam[n]; wparam[n] = L'\0'; - ret = wcsdup (wparam); - wparam[n] = wc; - return (ret); - } - } - break; - - case RP_SHORT_RIGHT: /* remove shortest match at end */ - for (n = wstrlen; n >= 0; n--) - { - if (wcsmatch (wpattern, wparam + n, FNMATCH_EXTFLAG) != FNM_NOMATCH) - { - wc = wparam[n]; wparam[n] = L'\0'; - ret = wcsdup (wparam); - wparam[n] = wc; - return (ret); - } - } - break; - } - - return (wparam); /* no match, return original string */ -} -#endif /* HANDLE_MULTIBYTE */ - -static char * -remove_pattern (param, pattern, op) - char *param, *pattern; - int op; -{ - char *xret; - - if (param == NULL) - return (param); - if (*param == '\0' || pattern == NULL || *pattern == '\0') /* minor optimization */ - return (savestring (param)); - -#if defined (HANDLE_MULTIBYTE) - if (MB_CUR_MAX > 1) - { - wchar_t *ret, *oret; - size_t n; - wchar_t *wparam, *wpattern; - mbstate_t ps; - - n = xdupmbstowcs (&wpattern, NULL, pattern); - if (n == (size_t)-1) - { - xret = remove_upattern (param, pattern, op); - return ((xret == param) ? savestring (param) : xret); - } - n = xdupmbstowcs (&wparam, NULL, param); - - if (n == (size_t)-1) - { - free (wpattern); - xret = remove_upattern (param, pattern, op); - return ((xret == param) ? savestring (param) : xret); - } - oret = ret = remove_wpattern (wparam, n, wpattern, op); - /* Don't bother to convert wparam back to multibyte string if nothing - matched; just return copy of original string */ - if (ret == wparam) - { - free (wparam); - free (wpattern); - return (savestring (param)); - } - - free (wparam); - free (wpattern); - - n = strlen (param); - xret = (char *)xmalloc (n + 1); - memset (&ps, '\0', sizeof (mbstate_t)); - n = wcsrtombs (xret, (const wchar_t **)&ret, n, &ps); - xret[n] = '\0'; /* just to make sure */ - free (oret); - return xret; - } - else -#endif - { - xret = remove_upattern (param, pattern, op); - return ((xret == param) ? savestring (param) : xret); - } -} - -/* Match PAT anywhere in STRING and return the match boundaries. - This returns 1 in case of a successful match, 0 otherwise. SP - and EP are pointers into the string where the match begins and - ends, respectively. MTYPE controls what kind of match is attempted. - MATCH_BEG and MATCH_END anchor the match at the beginning and end - of the string, respectively. The longest match is returned. */ -static int -match_upattern (string, pat, mtype, sp, ep) - char *string, *pat; - int mtype; - char **sp, **ep; -{ - int c, len, mlen; - register char *p, *p1, *npat; - char *end; - int n1; - - /* If the pattern doesn't match anywhere in the string, go ahead and - short-circuit right away. A minor optimization, saves a bunch of - unnecessary calls to strmatch (up to N calls for a string of N - characters) if the match is unsuccessful. To preserve the semantics - of the substring matches below, we make sure that the pattern has - `*' as first and last character, making a new pattern if necessary. */ - /* XXX - check this later if I ever implement `**' with special meaning, - since this will potentially result in `**' at the beginning or end */ - len = STRLEN (pat); - if (pat[0] != '*' || (pat[0] == '*' && pat[1] == LPAREN && extended_glob) || pat[len - 1] != '*') - { - p = npat = (char *)xmalloc (len + 3); - p1 = pat; - if (*p1 != '*' || (*p1 == '*' && p1[1] == LPAREN && extended_glob)) - *p++ = '*'; - while (*p1) - *p++ = *p1++; - if (p1[-1] != '*' || p[-2] == '\\') - *p++ = '*'; - *p = '\0'; - } - else - npat = pat; - c = strmatch (npat, string, FNMATCH_EXTFLAG); - if (npat != pat) - free (npat); - if (c == FNM_NOMATCH) - return (0); - - len = STRLEN (string); - end = string + len; - - mlen = umatchlen (pat, len); - - switch (mtype) - { - case MATCH_ANY: - for (p = string; p <= end; p++) - { - if (match_pattern_char (pat, p)) - { - p1 = (mlen == -1) ? end : p + mlen; - /* p1 - p = length of portion of string to be considered - p = current position in string - mlen = number of characters consumed by match (-1 for entire string) - end = end of string - we want to break immediately if the potential match len - is greater than the number of characters remaining in the - string - */ - if (p1 > end) - break; - for ( ; p1 >= p; p1--) - { - c = *p1; *p1 = '\0'; - if (strmatch (pat, p, FNMATCH_EXTFLAG) == 0) - { - *p1 = c; - *sp = p; - *ep = p1; - return 1; - } - *p1 = c; -#if 1 - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; -#endif - } - } - } - - return (0); - - case MATCH_BEG: - if (match_pattern_char (pat, string) == 0) - return (0); - - for (p = (mlen == -1) ? end : string + mlen; p >= string; p--) - { - c = *p; *p = '\0'; - if (strmatch (pat, string, FNMATCH_EXTFLAG) == 0) - { - *p = c; - *sp = string; - *ep = p; - return 1; - } - *p = c; - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; - } - - return (0); - - case MATCH_END: - for (p = end - ((mlen == -1) ? len : mlen); p <= end; p++) - { - if (strmatch (pat, p, FNMATCH_EXTFLAG) == 0) - { - *sp = p; - *ep = end; - return 1; - } - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; - } - - return (0); - } - - return (0); -} - -#if defined (HANDLE_MULTIBYTE) -/* Match WPAT anywhere in WSTRING and return the match boundaries. - This returns 1 in case of a successful match, 0 otherwise. Wide - character version. */ -static int -match_wpattern (wstring, indices, wstrlen, wpat, mtype, sp, ep) - wchar_t *wstring; - char **indices; - size_t wstrlen; - wchar_t *wpat; - int mtype; - char **sp, **ep; -{ - wchar_t wc, *wp, *nwpat, *wp1; - size_t len; - int mlen; - int n, n1, n2, simple; - - simple = (wpat[0] != L'\\' && wpat[0] != L'*' && wpat[0] != L'?' && wpat[0] != L'['); -#if defined (EXTENDED_GLOB) - if (extended_glob) - simple &= (wpat[1] != L'(' || (wpat[0] != L'*' && wpat[0] != L'?' && wpat[0] != L'+' && wpat[0] != L'!' && wpat[0] != L'@')); /*)*/ -#endif - - /* If the pattern doesn't match anywhere in the string, go ahead and - short-circuit right away. A minor optimization, saves a bunch of - unnecessary calls to strmatch (up to N calls for a string of N - characters) if the match is unsuccessful. To preserve the semantics - of the substring matches below, we make sure that the pattern has - `*' as first and last character, making a new pattern if necessary. */ - len = wcslen (wpat); - if (wpat[0] != L'*' || (wpat[0] == L'*' && wpat[1] == WLPAREN && extended_glob) || wpat[len - 1] != L'*') - { - wp = nwpat = (wchar_t *)xmalloc ((len + 3) * sizeof (wchar_t)); - wp1 = wpat; - if (*wp1 != L'*' || (*wp1 == '*' && wp1[1] == WLPAREN && extended_glob)) - *wp++ = L'*'; - while (*wp1 != L'\0') - *wp++ = *wp1++; - if (wp1[-1] != L'*' || wp1[-2] == L'\\') - *wp++ = L'*'; - *wp = '\0'; - } - else - nwpat = wpat; - len = wcsmatch (nwpat, wstring, FNMATCH_EXTFLAG); - if (nwpat != wpat) - free (nwpat); - if (len == FNM_NOMATCH) - return (0); - - mlen = wmatchlen (wpat, wstrlen); - -/* itrace("wmatchlen (%ls) -> %d", wpat, mlen); */ - switch (mtype) - { - case MATCH_ANY: - for (n = 0; n <= wstrlen; n++) - { - n2 = simple ? (*wpat == wstring[n]) : match_pattern_wchar (wpat, wstring + n); - if (n2) - { - n1 = (mlen == -1) ? wstrlen : n + mlen; - if (n1 > wstrlen) - break; - - for ( ; n1 >= n; n1--) - { - wc = wstring[n1]; wstring[n1] = L'\0'; - if (wcsmatch (wpat, wstring + n, FNMATCH_EXTFLAG) == 0) - { - wstring[n1] = wc; - *sp = indices[n]; - *ep = indices[n1]; - return 1; - } - wstring[n1] = wc; - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; - } - } - } - - return (0); - - case MATCH_BEG: - if (match_pattern_wchar (wpat, wstring) == 0) - return (0); - - for (n = (mlen == -1) ? wstrlen : mlen; n >= 0; n--) - { - wc = wstring[n]; wstring[n] = L'\0'; - if (wcsmatch (wpat, wstring, FNMATCH_EXTFLAG) == 0) - { - wstring[n] = wc; - *sp = indices[0]; - *ep = indices[n]; - return 1; - } - wstring[n] = wc; - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; - } - - return (0); - - case MATCH_END: - for (n = wstrlen - ((mlen == -1) ? wstrlen : mlen); n <= wstrlen; n++) - { - if (wcsmatch (wpat, wstring + n, FNMATCH_EXTFLAG) == 0) - { - *sp = indices[n]; - *ep = indices[wstrlen]; - return 1; - } - /* If MLEN != -1, we have a fixed length pattern. */ - if (mlen != -1) - break; - } - - return (0); - } - - return (0); -} -#endif /* HANDLE_MULTIBYTE */ - -static int -match_pattern (string, pat, mtype, sp, ep) - char *string, *pat; - int mtype; - char **sp, **ep; -{ -#if defined (HANDLE_MULTIBYTE) - int ret; - size_t n; - wchar_t *wstring, *wpat; - char **indices; - size_t slen, plen, mslen, mplen, wn; -#endif - - if (string == 0 || *string == 0 || pat == 0 || *pat == 0) - return (0); - -#if defined (HANDLE_MULTIBYTE) - if (MB_CUR_MAX > 1) - { - if (mbsmbchar (string) == 0 && mbsmbchar (pat) == 0) - return (match_upattern (string, pat, mtype, sp, ep)); - - n = xdupmbstowcs (&wpat, NULL, pat); - if (n == (size_t)-1) - return (match_upattern (string, pat, mtype, sp, ep)); - n = xdupmbstowcs (&wstring, &indices, string); - if (n == (size_t)-1) - { - free (wpat); - return (match_upattern (string, pat, mtype, sp, ep)); - } -wn = wstring ? wcslen (wstring) : 0; -if (n != wn) - itrace("xdupmbstowcs returns %d != length of wstring %d", n, wn); - ret = match_wpattern (wstring, indices, n, wpat, mtype, sp, ep); - - free (wpat); - free (wstring); - free (indices); - - return (ret); - } - else -#endif - return (match_upattern (string, pat, mtype, sp, ep)); -} - -static int -getpatspec (c, value) - int c; - char *value; -{ - if (c == '#') - return ((*value == '#') ? RP_LONG_LEFT : RP_SHORT_LEFT); - else /* c == '%' */ - return ((*value == '%') ? RP_LONG_RIGHT : RP_SHORT_RIGHT); -} - -/* Posix.2 says that the WORD should be run through tilde expansion, - parameter expansion, command substitution and arithmetic expansion. - This leaves the result quoted, so quote_string_for_globbing () has - to be called to fix it up for strmatch (). If QUOTED is non-zero, - it means that the entire expression was enclosed in double quotes. - This means that quoting characters in the pattern do not make any - special pattern characters quoted. For example, the `*' in the - following retains its special meaning: "${foo#'*'}". */ -static char * -getpattern (value, quoted, expandpat) - char *value; - int quoted, expandpat; -{ - char *pat, *tword; - WORD_LIST *l; -#if 0 - int i; -#endif - /* There is a problem here: how to handle single or double quotes in the - pattern string when the whole expression is between double quotes? - POSIX.2 says that enclosing double quotes do not cause the pattern to - be quoted, but does that leave us a problem with @ and array[@] and their - expansions inside a pattern? */ -#if 0 - if (expandpat && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *tword) - { - i = 0; - pat = string_extract_double_quoted (tword, &i, 1); - free (tword); - tword = pat; - } -#endif - - /* expand_string_for_rhs () leaves WORD quoted and does not perform - word splitting. */ - l = *value ? expand_string_for_rhs (value, - (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? Q_PATQUOTE : quoted, - (int *)NULL, (int *)NULL) - : (WORD_LIST *)0; - pat = string_list (l); - dispose_words (l); - if (pat) - { - tword = quote_string_for_globbing (pat, QGLOB_CVTNULL); - free (pat); - pat = tword; - } - return (pat); -} - -#if 0 -/* Handle removing a pattern from a string as a result of ${name%[%]value} - or ${name#[#]value}. */ -static char * -variable_remove_pattern (value, pattern, patspec, quoted) - char *value, *pattern; - int patspec, quoted; -{ - char *tword; - - tword = remove_pattern (value, pattern, patspec); - - return (tword); -} -#endif - -static char * -list_remove_pattern (list, pattern, patspec, itype, quoted) - WORD_LIST *list; - char *pattern; - int patspec, itype, quoted; -{ - WORD_LIST *new, *l; - WORD_DESC *w; - char *tword; - - for (new = (WORD_LIST *)NULL, l = list; l; l = l->next) - { - tword = remove_pattern (l->word->word, pattern, patspec); - w = alloc_word_desc (); - w->word = tword ? tword : savestring (""); - new = make_word_list (w, new); - } - - l = REVERSE_LIST (new, WORD_LIST *); - tword = string_list_pos_params (itype, l, quoted); - dispose_words (l); - - return (tword); -} - -static char * -parameter_list_remove_pattern (itype, pattern, patspec, quoted) - int itype; - char *pattern; - int patspec, quoted; -{ - char *ret; - WORD_LIST *list; - - list = list_rest_of_args (); - if (list == 0) - return ((char *)NULL); - ret = list_remove_pattern (list, pattern, patspec, itype, quoted); - dispose_words (list); - return (ret); -} - -#if defined (ARRAY_VARS) -static char * -array_remove_pattern (var, pattern, patspec, varname, quoted) - SHELL_VAR *var; - char *pattern; - int patspec; - char *varname; /* so we can figure out how it's indexed */ - int quoted; -{ - ARRAY *a; - HASH_TABLE *h; - int itype; - char *ret; - WORD_LIST *list; - SHELL_VAR *v; - - /* compute itype from varname here */ - v = array_variable_part (varname, &ret, 0); - itype = ret[0]; - - a = (v && array_p (v)) ? array_cell (v) : 0; - h = (v && assoc_p (v)) ? assoc_cell (v) : 0; - - list = a ? array_to_word_list (a) : (h ? assoc_to_word_list (h) : 0); - if (list == 0) - return ((char *)NULL); - ret = list_remove_pattern (list, pattern, patspec, itype, quoted); - dispose_words (list); - - return ret; -} -#endif /* ARRAY_VARS */ - -static char * -parameter_brace_remove_pattern (varname, value, ind, patstr, rtype, quoted, flags) - char *varname, *value; - int ind; - char *patstr; - int rtype, quoted, flags; -{ - int vtype, patspec, starsub; - char *temp1, *val, *pattern; - SHELL_VAR *v; - - if (value == 0) - return ((char *)NULL); - - this_command_name = varname; - - vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val); - if (vtype == -1) - return ((char *)NULL); - - starsub = vtype & VT_STARSUB; - vtype &= ~VT_STARSUB; - - patspec = getpatspec (rtype, patstr); - if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) - patstr++; - - /* Need to pass getpattern newly-allocated memory in case of expansion -- - the expansion code will free the passed string on an error. */ - temp1 = savestring (patstr); - pattern = getpattern (temp1, quoted, 1); - free (temp1); - - temp1 = (char *)NULL; /* shut up gcc */ - switch (vtype) - { - case VT_VARIABLE: - case VT_ARRAYMEMBER: - temp1 = remove_pattern (val, pattern, patspec); - if (vtype == VT_VARIABLE) - FREE (val); - if (temp1) - { - val = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - ? quote_string (temp1) - : quote_escapes (temp1); - free (temp1); - temp1 = val; - } - break; -#if defined (ARRAY_VARS) - case VT_ARRAYVAR: - temp1 = array_remove_pattern (v, pattern, patspec, varname, quoted); - if (temp1 && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0)) - { - val = quote_escapes (temp1); - free (temp1); - temp1 = val; - } - break; -#endif - case VT_POSPARMS: - temp1 = parameter_list_remove_pattern (varname[0], pattern, patspec, quoted); - if (temp1 && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0)) - { - val = quote_escapes (temp1); - free (temp1); - temp1 = val; - } - break; - } - - FREE (pattern); - return temp1; -} - -/******************************************* - * * - * Functions to expand WORD_DESCs * - * * - *******************************************/ - -/* Expand WORD, performing word splitting on the result. This does - parameter expansion, command substitution, arithmetic expansion, - word splitting, and quote removal. */ - -WORD_LIST * -expand_word (word, quoted) - WORD_DESC *word; - int quoted; -{ - WORD_LIST *result, *tresult; - - tresult = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); - result = word_list_split (tresult); - dispose_words (tresult); - return (result ? dequote_list (result) : result); -} - -/* Expand WORD, but do not perform word splitting on the result. This - does parameter expansion, command substitution, arithmetic expansion, - and quote removal. */ -WORD_LIST * -expand_word_unsplit (word, quoted) - WORD_DESC *word; - int quoted; -{ - WORD_LIST *result; - - expand_no_split_dollar_star = 1; -#if defined (HANDLE_MULTIBYTE) - if (ifs_firstc[0] == 0) -#else - if (ifs_firstc == 0) -#endif - word->flags |= W_NOSPLIT; - word->flags |= W_NOSPLIT2; - result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); - expand_no_split_dollar_star = 0; - - return (result ? dequote_list (result) : result); -} - -/* Perform shell expansions on WORD, but do not perform word splitting or - quote removal on the result. Virtually identical to expand_word_unsplit; - could be combined if implementations don't diverge. */ -WORD_LIST * -expand_word_leave_quoted (word, quoted) - WORD_DESC *word; - int quoted; -{ - WORD_LIST *result; - - expand_no_split_dollar_star = 1; -#if defined (HANDLE_MULTIBYTE) - if (ifs_firstc[0] == 0) -#else - if (ifs_firstc == 0) -#endif - word->flags |= W_NOSPLIT; - word->flags |= W_NOSPLIT2; - result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); - expand_no_split_dollar_star = 0; - - return result; -} - -#if defined (PROCESS_SUBSTITUTION) - -/*****************************************************************/ -/* */ -/* Hacking Process Substitution */ -/* */ -/*****************************************************************/ - -#if !defined (HAVE_DEV_FD) -/* Named pipes must be removed explicitly with `unlink'. This keeps a list - of FIFOs the shell has open. unlink_fifo_list will walk the list and - unlink all of them. add_fifo_list adds the name of an open FIFO to the - list. NFIFO is a count of the number of FIFOs in the list. */ -#define FIFO_INCR 20 - -struct temp_fifo { - char *file; - pid_t proc; -}; - -static struct temp_fifo *fifo_list = (struct temp_fifo *)NULL; -static int nfifo; -static int fifo_list_size; - -char * -copy_fifo_list (sizep) - int *sizep; -{ - if (sizep) - *sizep = 0; - return (char *)NULL; -} - -static void -add_fifo_list (pathname) - char *pathname; -{ - if (nfifo >= fifo_list_size - 1) - { - fifo_list_size += FIFO_INCR; - fifo_list = (struct temp_fifo *)xrealloc (fifo_list, - fifo_list_size * sizeof (struct temp_fifo)); - } - - fifo_list[nfifo].file = savestring (pathname); - nfifo++; -} - -void -unlink_fifo (i) - int i; -{ - if ((fifo_list[i].proc == -1) || (kill(fifo_list[i].proc, 0) == -1)) - { - unlink (fifo_list[i].file); - free (fifo_list[i].file); - fifo_list[i].file = (char *)NULL; - fifo_list[i].proc = -1; - } -} - -void -unlink_fifo_list () -{ - int saved, i, j; - - if (nfifo == 0) - return; - - for (i = saved = 0; i < nfifo; i++) - { - if ((fifo_list[i].proc == -1) || (kill(fifo_list[i].proc, 0) == -1)) - { - unlink (fifo_list[i].file); - free (fifo_list[i].file); - fifo_list[i].file = (char *)NULL; - fifo_list[i].proc = -1; - } - else - saved++; - } - - /* If we didn't remove some of the FIFOs, compact the list. */ - if (saved) - { - for (i = j = 0; i < nfifo; i++) - if (fifo_list[i].file) - { - fifo_list[j].file = fifo_list[i].file; - fifo_list[j].proc = fifo_list[i].proc; - j++; - } - nfifo = j; - } - else - nfifo = 0; -} - -/* Take LIST, which is a bitmap denoting active FIFOs in fifo_list - from some point in the past, and close all open FIFOs in fifo_list - that are not marked as active in LIST. If LIST is NULL, close - everything in fifo_list. LSIZE is the number of elements in LIST, in - case it's larger than fifo_list_size (size of fifo_list). */ -void -close_new_fifos (list, lsize) - char *list; - int lsize; -{ - int i; - - if (list == 0) - { - unlink_fifo_list (); - return; - } - - for (i = 0; i < lsize; i++) - if (list[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1) - unlink_fifo (i); - - for (i = lsize; i < fifo_list_size; i++) - unlink_fifo (i); -} - -int -fifos_pending () -{ - return nfifo; -} - -int -num_fifos () -{ - return nfifo; -} - -static char * -make_named_pipe () -{ - char *tname; - - tname = sh_mktmpname ("sh-np", MT_USERANDOM|MT_USETMPDIR); - if (mkfifo (tname, 0600) < 0) - { - free (tname); - return ((char *)NULL); - } - - add_fifo_list (tname); - return (tname); -} - -#else /* HAVE_DEV_FD */ - -/* DEV_FD_LIST is a bitmap of file descriptors attached to pipes the shell - has open to children. NFDS is a count of the number of bits currently - set in DEV_FD_LIST. TOTFDS is a count of the highest possible number - of open files. */ -static char *dev_fd_list = (char *)NULL; -static int nfds; -static int totfds; /* The highest possible number of open files. */ - -char * -copy_fifo_list (sizep) - int *sizep; -{ - char *ret; - - if (nfds == 0 || totfds == 0) - { - if (sizep) - *sizep = 0; - return (char *)NULL; - } - - if (sizep) - *sizep = totfds; - ret = (char *)xmalloc (totfds); - return (memcpy (ret, dev_fd_list, totfds)); -} - -static void -add_fifo_list (fd) - int fd; -{ - if (dev_fd_list == 0 || fd >= totfds) - { - int ofds; - - ofds = totfds; - totfds = getdtablesize (); - if (totfds < 0 || totfds > 256) - totfds = 256; - if (fd >= totfds) - totfds = fd + 2; - - dev_fd_list = (char *)xrealloc (dev_fd_list, totfds); - memset (dev_fd_list + ofds, '\0', totfds - ofds); - } - - dev_fd_list[fd] = 1; - nfds++; -} - -int -fifos_pending () -{ - return 0; /* used for cleanup; not needed with /dev/fd */ -} - -int -num_fifos () -{ - return nfds; -} - -void -unlink_fifo (fd) - int fd; -{ - if (dev_fd_list[fd]) - { - close (fd); - dev_fd_list[fd] = 0; - nfds--; - } -} - -void -unlink_fifo_list () -{ - register int i; - - if (nfds == 0) - return; - - for (i = 0; nfds && i < totfds; i++) - unlink_fifo (i); - - nfds = 0; -} - -/* Take LIST, which is a snapshot copy of dev_fd_list from some point in - the past, and close all open fds in dev_fd_list that are not marked - as open in LIST. If LIST is NULL, close everything in dev_fd_list. - LSIZE is the number of elements in LIST, in case it's larger than - totfds (size of dev_fd_list). */ -void -close_new_fifos (list, lsize) - char *list; - int lsize; -{ - int i; - - if (list == 0) - { - unlink_fifo_list (); - return; - } - - for (i = 0; i < lsize; i++) - if (list[i] == 0 && i < totfds && dev_fd_list[i]) - unlink_fifo (i); - - for (i = lsize; i < totfds; i++) - unlink_fifo (i); -} - -#if defined (NOTDEF) -print_dev_fd_list () -{ - register int i; - - fprintf (stderr, "pid %ld: dev_fd_list:", (long)getpid ()); - fflush (stderr); - - for (i = 0; i < totfds; i++) - { - if (dev_fd_list[i]) - fprintf (stderr, " %d", i); - } - fprintf (stderr, "\n"); -} -#endif /* NOTDEF */ - -static char * -make_dev_fd_filename (fd) - int fd; -{ - char *ret, intbuf[INT_STRLEN_BOUND (int) + 1], *p; - - ret = (char *)xmalloc (sizeof (DEV_FD_PREFIX) + 8); - - strcpy (ret, DEV_FD_PREFIX); - p = inttostr (fd, intbuf, sizeof (intbuf)); - strcpy (ret + sizeof (DEV_FD_PREFIX) - 1, p); - - add_fifo_list (fd); - return (ret); -} - -#endif /* HAVE_DEV_FD */ - -/* Return a filename that will open a connection to the process defined by - executing STRING. HAVE_DEV_FD, if defined, means open a pipe and return - a filename in /dev/fd corresponding to a descriptor that is one of the - ends of the pipe. If not defined, we use named pipes on systems that have - them. Systems without /dev/fd and named pipes are out of luck. - - OPEN_FOR_READ_IN_CHILD, if 1, means open the named pipe for reading or - use the read end of the pipe and dup that file descriptor to fd 0 in - the child. If OPEN_FOR_READ_IN_CHILD is 0, we open the named pipe for - writing or use the write end of the pipe in the child, and dup that - file descriptor to fd 1 in the child. The parent does the opposite. */ - -static char * -process_substitute (string, open_for_read_in_child) - char *string; - int open_for_read_in_child; -{ - char *pathname; - int fd, result; - pid_t old_pid, pid; -#if defined (HAVE_DEV_FD) - int parent_pipe_fd, child_pipe_fd; - int fildes[2]; -#endif /* HAVE_DEV_FD */ -#if defined (JOB_CONTROL) - pid_t old_pipeline_pgrp; -#endif - - if (!string || !*string || wordexp_only) - return ((char *)NULL); - -#if !defined (HAVE_DEV_FD) - pathname = make_named_pipe (); -#else /* HAVE_DEV_FD */ - if (pipe (fildes) < 0) - { - sys_error (_("cannot make pipe for process substitution")); - return ((char *)NULL); - } - /* If OPEN_FOR_READ_IN_CHILD == 1, we want to use the write end of - the pipe in the parent, otherwise the read end. */ - parent_pipe_fd = fildes[open_for_read_in_child]; - child_pipe_fd = fildes[1 - open_for_read_in_child]; - /* Move the parent end of the pipe to some high file descriptor, to - avoid clashes with FDs used by the script. */ - parent_pipe_fd = move_to_high_fd (parent_pipe_fd, 1, 64); - - pathname = make_dev_fd_filename (parent_pipe_fd); -#endif /* HAVE_DEV_FD */ - - if (pathname == 0) - { - sys_error (_("cannot make pipe for process substitution")); - return ((char *)NULL); - } - - old_pid = last_made_pid; - -#if defined (JOB_CONTROL) - old_pipeline_pgrp = pipeline_pgrp; - pipeline_pgrp = shell_pgrp; - save_pipeline (1); -#endif /* JOB_CONTROL */ - - pid = make_child ((char *)NULL, 1); - if (pid == 0) - { - reset_terminating_signals (); /* XXX */ - free_pushed_string_input (); - /* Cancel traps, in trap.c. */ - restore_original_signals (); /* XXX - what about special builtins? bash-4.2 */ - setup_async_signals (); - subshell_environment |= SUBSHELL_COMSUB|SUBSHELL_PROCSUB; - } - -#if defined (JOB_CONTROL) - set_sigchld_handler (); - stop_making_children (); - /* XXX - should we only do this in the parent? (as in command subst) */ - pipeline_pgrp = old_pipeline_pgrp; -#endif /* JOB_CONTROL */ - - if (pid < 0) - { - sys_error (_("cannot make child for process substitution")); - free (pathname); -#if defined (HAVE_DEV_FD) - close (parent_pipe_fd); - close (child_pipe_fd); -#endif /* HAVE_DEV_FD */ - return ((char *)NULL); - } - - if (pid > 0) - { -#if defined (JOB_CONTROL) - restore_pipeline (1); -#endif - -#if !defined (HAVE_DEV_FD) - fifo_list[nfifo-1].proc = pid; -#endif - - last_made_pid = old_pid; - -#if defined (JOB_CONTROL) && defined (PGRP_PIPE) - close_pgrp_pipe (); -#endif /* JOB_CONTROL && PGRP_PIPE */ - -#if defined (HAVE_DEV_FD) - close (child_pipe_fd); -#endif /* HAVE_DEV_FD */ - - return (pathname); - } - - set_sigint_handler (); - -#if defined (JOB_CONTROL) - set_job_control (0); -#endif /* JOB_CONTROL */ - -#if !defined (HAVE_DEV_FD) - /* Open the named pipe in the child. */ - fd = open (pathname, open_for_read_in_child ? O_RDONLY|O_NONBLOCK : O_WRONLY); - if (fd < 0) - { - /* Two separate strings for ease of translation. */ - if (open_for_read_in_child) - sys_error (_("cannot open named pipe %s for reading"), pathname); - else - sys_error (_("cannot open named pipe %s for writing"), pathname); - - exit (127); - } - if (open_for_read_in_child) - { - if (sh_unset_nodelay_mode (fd) < 0) - { - sys_error (_("cannot reset nodelay mode for fd %d"), fd); - exit (127); - } - } -#else /* HAVE_DEV_FD */ - fd = child_pipe_fd; -#endif /* HAVE_DEV_FD */ - - if (dup2 (fd, open_for_read_in_child ? 0 : 1) < 0) - { - sys_error (_("cannot duplicate named pipe %s as fd %d"), pathname, - open_for_read_in_child ? 0 : 1); - exit (127); - } - - if (fd != (open_for_read_in_child ? 0 : 1)) - close (fd); - - /* Need to close any files that this process has open to pipes inherited - from its parent. */ - if (current_fds_to_close) - { - close_fd_bitmap (current_fds_to_close); - current_fds_to_close = (struct fd_bitmap *)NULL; - } - -#if defined (HAVE_DEV_FD) - /* Make sure we close the parent's end of the pipe and clear the slot - in the fd list so it is not closed later, if reallocated by, for - instance, pipe(2). */ - close (parent_pipe_fd); - dev_fd_list[parent_pipe_fd] = 0; -#endif /* HAVE_DEV_FD */ - - /* subshells shouldn't have this flag, which controls using the temporary - environment for variable lookups. */ - expanding_redir = 0; - - result = parse_and_execute (string, "process substitution", (SEVAL_NONINT|SEVAL_NOHIST)); - -#if !defined (HAVE_DEV_FD) - /* Make sure we close the named pipe in the child before we exit. */ - close (open_for_read_in_child ? 0 : 1); -#endif /* !HAVE_DEV_FD */ - - exit (result); - /*NOTREACHED*/ -} -#endif /* PROCESS_SUBSTITUTION */ - -/***********************************/ -/* */ -/* Command Substitution */ -/* */ -/***********************************/ - -static char * -read_comsub (fd, quoted, rflag) - int fd, quoted; - int *rflag; -{ - char *istring, buf[128], *bufp, *s; - int istring_index, istring_size, c, tflag, skip_ctlesc, skip_ctlnul; - ssize_t bufn; - - istring = (char *)NULL; - istring_index = istring_size = bufn = tflag = 0; - - for (skip_ctlesc = skip_ctlnul = 0, s = ifs_value; s && *s; s++) - skip_ctlesc |= *s == CTLESC, skip_ctlnul |= *s == CTLNUL; - - /* Read the output of the command through the pipe. This may need to be - changed to understand multibyte characters in the future. */ - while (1) - { - if (fd < 0) - break; - if (--bufn <= 0) - { - bufn = zread (fd, buf, sizeof (buf)); - if (bufn <= 0) - break; - bufp = buf; - } - c = *bufp++; - - if (c == 0) - { -#if 0 - internal_warning ("read_comsub: ignored null byte in input"); -#endif - continue; - } - - /* Add the character to ISTRING, possibly after resizing it. */ - RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, DEFAULT_ARRAY_SIZE); - - /* This is essentially quote_string inline */ - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) /* || c == CTLESC || c == CTLNUL */) - istring[istring_index++] = CTLESC; - /* Escape CTLESC and CTLNUL in the output to protect those characters - from the rest of the word expansions (word splitting and globbing.) - This is essentially quote_escapes inline. */ - else if (skip_ctlesc == 0 && c == CTLESC) - { - tflag |= W_HASCTLESC; - istring[istring_index++] = CTLESC; - } - else if ((skip_ctlnul == 0 && c == CTLNUL) || (c == ' ' && (ifs_value && *ifs_value == 0))) - istring[istring_index++] = CTLESC; - - istring[istring_index++] = c; - -#if 0 -#if defined (__CYGWIN__) - if (c == '\n' && istring_index > 1 && istring[istring_index - 2] == '\r') - { - istring_index--; - istring[istring_index - 1] = '\n'; - } -#endif -#endif - } - - if (istring) - istring[istring_index] = '\0'; - - /* If we read no output, just return now and save ourselves some - trouble. */ - if (istring_index == 0) - { - FREE (istring); - if (rflag) - *rflag = tflag; - return (char *)NULL; - } - - /* Strip trailing newlines from the output of the command. */ - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - { - while (istring_index > 0) - { - if (istring[istring_index - 1] == '\n') - { - --istring_index; - - /* If the newline was quoted, remove the quoting char. */ - if (istring[istring_index - 1] == CTLESC) - --istring_index; - } - else - break; - } - istring[istring_index] = '\0'; - } - else - strip_trailing (istring, istring_index - 1, 1); - - if (rflag) - *rflag = tflag; - return istring; -} - -/* Perform command substitution on STRING. This returns a WORD_DESC * with the - contained string possibly quoted. */ -WORD_DESC * -command_substitute (string, quoted) - char *string; - int quoted; -{ - pid_t pid, old_pid, old_pipeline_pgrp, old_async_pid; - char *istring; - int result, fildes[2], function_value, pflags, rc, tflag; - WORD_DESC *ret; - - istring = (char *)NULL; - - /* Don't fork () if there is no need to. In the case of no command to - run, just return NULL. */ - if (!string || !*string || (string[0] == '\n' && !string[1])) - return ((WORD_DESC *)NULL); - - if (wordexp_only && read_but_dont_execute) - { - last_command_exit_value = EX_WEXPCOMSUB; - jump_to_top_level (EXITPROG); - } - - /* We're making the assumption here that the command substitution will - eventually run a command from the file system. Since we'll run - maybe_make_export_env in this subshell before executing that command, - the parent shell and any other shells it starts will have to remake - the environment. If we make it before we fork, other shells won't - have to. Don't bother if we have any temporary variable assignments, - though, because the export environment will be remade after this - command completes anyway, but do it if all the words to be expanded - are variable assignments. */ - if (subst_assign_varlist == 0 || garglist == 0) - maybe_make_export_env (); /* XXX */ - - /* Flags to pass to parse_and_execute() */ - pflags = (interactive && sourcelevel == 0) ? SEVAL_RESETLINE : 0; - - /* Pipe the output of executing STRING into the current shell. */ - if (pipe (fildes) < 0) - { - sys_error (_("cannot make pipe for command substitution")); - goto error_exit; - } - - old_pid = last_made_pid; -#if defined (JOB_CONTROL) - old_pipeline_pgrp = pipeline_pgrp; - /* Don't reset the pipeline pgrp if we're already a subshell in a pipeline. */ - if ((subshell_environment & SUBSHELL_PIPE) == 0) - pipeline_pgrp = shell_pgrp; - cleanup_the_pipeline (); -#endif /* JOB_CONTROL */ - - old_async_pid = last_asynchronous_pid; - pid = make_child ((char *)NULL, subshell_environment&SUBSHELL_ASYNC); - last_asynchronous_pid = old_async_pid; - - if (pid == 0) - { - /* Reset the signal handlers in the child, but don't free the - trap strings. Set a flag noting that we have to free the - trap strings if we run trap to change a signal disposition. */ - reset_signal_handlers (); - subshell_environment |= SUBSHELL_RESETTRAP; - } - -#if defined (JOB_CONTROL) - /* XXX DO THIS ONLY IN PARENT ? XXX */ - set_sigchld_handler (); - stop_making_children (); - if (pid != 0) - pipeline_pgrp = old_pipeline_pgrp; -#else - stop_making_children (); -#endif /* JOB_CONTROL */ - - if (pid < 0) - { - sys_error (_("cannot make child for command substitution")); - error_exit: - - last_made_pid = old_pid; - - FREE (istring); - close (fildes[0]); - close (fildes[1]); - return ((WORD_DESC *)NULL); - } - - if (pid == 0) - { - set_sigint_handler (); /* XXX */ - - free_pushed_string_input (); - - if (dup2 (fildes[1], 1) < 0) - { - sys_error (_("command_substitute: cannot duplicate pipe as fd 1")); - exit (EXECUTION_FAILURE); - } - - /* If standard output is closed in the parent shell - (such as after `exec >&-'), file descriptor 1 will be - the lowest available file descriptor, and end up in - fildes[0]. This can happen for stdin and stderr as well, - but stdout is more important -- it will cause no output - to be generated from this command. */ - if ((fildes[1] != fileno (stdin)) && - (fildes[1] != fileno (stdout)) && - (fildes[1] != fileno (stderr))) - close (fildes[1]); - - if ((fildes[0] != fileno (stdin)) && - (fildes[0] != fileno (stdout)) && - (fildes[0] != fileno (stderr))) - close (fildes[0]); - -#ifdef __CYGWIN__ - /* Let stdio know the fd may have changed from text to binary mode, and - make sure to preserve stdout line buffering. */ - freopen (NULL, "w", stdout); - sh_setlinebuf (stdout); -#endif /* __CYGWIN__ */ - - /* The currently executing shell is not interactive. */ - interactive = 0; - - /* This is a subshell environment. */ - subshell_environment |= SUBSHELL_COMSUB; - - /* When not in POSIX mode, command substitution does not inherit - the -e flag. */ - if (posixly_correct == 0) - { - builtin_ignoring_errexit = 0; - change_flag ('e', FLAG_OFF); - set_shellopts (); - } - - remove_quoted_escapes (string); - - startup_state = 2; /* see if we can avoid a fork */ - /* Give command substitution a place to jump back to on failure, - so we don't go back up to main (). */ - result = setjmp_nosigs (top_level); - - /* If we're running a command substitution inside a shell function, - trap `return' so we don't return from the function in the subshell - and go off to never-never land. */ - if (result == 0 && return_catch_flag) - function_value = setjmp_nosigs (return_catch); - else - function_value = 0; - - if (result == ERREXIT) - rc = last_command_exit_value; - else if (result == EXITPROG) - rc = last_command_exit_value; - else if (result) - rc = EXECUTION_FAILURE; - else if (function_value) - rc = return_catch_value; - else - { - subshell_level++; - rc = parse_and_execute (string, "command substitution", pflags|SEVAL_NOHIST); - subshell_level--; - } - - last_command_exit_value = rc; - rc = run_exit_trap (); -#if defined (PROCESS_SUBSTITUTION) - unlink_fifo_list (); -#endif - exit (rc); - } - else - { -#if defined (JOB_CONTROL) && defined (PGRP_PIPE) - close_pgrp_pipe (); -#endif /* JOB_CONTROL && PGRP_PIPE */ - - close (fildes[1]); - - tflag = 0; - istring = read_comsub (fildes[0], quoted, &tflag); - - close (fildes[0]); - - current_command_subst_pid = pid; - last_command_exit_value = wait_for (pid); - last_command_subst_pid = pid; - last_made_pid = old_pid; - -#if defined (JOB_CONTROL) - /* If last_command_exit_value > 128, then the substituted command - was terminated by a signal. If that signal was SIGINT, then send - SIGINT to ourselves. This will break out of loops, for instance. */ - if (last_command_exit_value == (128 + SIGINT) && last_command_exit_signal == SIGINT) - kill (getpid (), SIGINT); - - /* wait_for gives the terminal back to shell_pgrp. If some other - process group should have it, give it away to that group here. - pipeline_pgrp is non-zero only while we are constructing a - pipline, so what we are concerned about is whether or not that - pipeline was started in the background. A pipeline started in - the background should never get the tty back here. */ - if (interactive && pipeline_pgrp != (pid_t)0 && (subshell_environment & SUBSHELL_ASYNC) == 0) - give_terminal_to (pipeline_pgrp, 0); -#endif /* JOB_CONTROL */ - - ret = alloc_word_desc (); - ret->word = istring; - ret->flags = tflag; - - return ret; - } -} - -/******************************************************** - * * - * Utility functions for parameter expansion * - * * - ********************************************************/ - -#if defined (ARRAY_VARS) - -static arrayind_t -array_length_reference (s) - char *s; -{ - int len; - arrayind_t ind; - char *akey; - char *t, c; - ARRAY *array; - HASH_TABLE *h; - SHELL_VAR *var; - - var = array_variable_part (s, &t, &len); - - /* If unbound variables should generate an error, report one and return - failure. */ - if ((var == 0 || (assoc_p (var) == 0 && array_p (var) == 0)) && unbound_vars_is_error) - { - c = *--t; - *t = '\0'; - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (s); - *t = c; - return (-1); - } - else if (var == 0) - return 0; - - /* We support a couple of expansions for variables that are not arrays. - We'll return the length of the value for v[0], and 1 for v[@] or - v[*]. Return 0 for everything else. */ - - array = array_p (var) ? array_cell (var) : (ARRAY *)NULL; - h = assoc_p (var) ? assoc_cell (var) : (HASH_TABLE *)NULL; - - if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') - { - if (assoc_p (var)) - return (h ? assoc_num_elements (h) : 0); - else if (array_p (var)) - return (array ? array_num_elements (array) : 0); - else - return (var_isset (var) ? 1 : 0); - } - - if (assoc_p (var)) - { - t[len - 1] = '\0'; - akey = expand_assignment_string_to_string (t, 0); /* [ */ - t[len - 1] = ']'; - if (akey == 0 || *akey == 0) - { - err_badarraysub (t); - FREE (akey); - return (-1); - } - t = assoc_reference (assoc_cell (var), akey); - free (akey); - } - else - { - ind = array_expand_index (var, t, len); - /* negative subscripts to indexed arrays count back from end */ - if (var && array_p (var) && ind < 0) - ind = array_max_index (array_cell (var)) + 1 + ind; - if (ind < 0) - { - err_badarraysub (t); - return (-1); - } - if (array_p (var)) - t = array_reference (array, ind); - else - t = (ind == 0) ? value_cell (var) : (char *)NULL; - } - - len = MB_STRLEN (t); - return (len); -} -#endif /* ARRAY_VARS */ - -static int -valid_brace_expansion_word (name, var_is_special) - char *name; - int var_is_special; -{ - if (DIGIT (*name) && all_digits (name)) - return 1; - else if (var_is_special) - return 1; -#if defined (ARRAY_VARS) - else if (valid_array_reference (name)) - return 1; -#endif /* ARRAY_VARS */ - else if (legal_identifier (name)) - return 1; - else - return 0; -} - -static int -chk_atstar (name, quoted, quoted_dollar_atp, contains_dollar_at) - char *name; - int quoted; - int *quoted_dollar_atp, *contains_dollar_at; -{ - char *temp1; - - if (name == 0) - { - if (quoted_dollar_atp) - *quoted_dollar_atp = 0; - if (contains_dollar_at) - *contains_dollar_at = 0; - return 0; - } - - /* check for $@ and $* */ - if (name[0] == '@' && name[1] == 0) - { - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 1; - if (contains_dollar_at) - *contains_dollar_at = 1; - return 1; - } - else if (name[0] == '*' && name[1] == '\0' && quoted == 0) - { - if (contains_dollar_at) - *contains_dollar_at = 1; - return 1; - } - - /* Now check for ${array[@]} and ${array[*]} */ -#if defined (ARRAY_VARS) - else if (valid_array_reference (name)) - { - temp1 = mbschr (name, '['); - if (temp1 && temp1[1] == '@' && temp1[2] == ']') - { - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 1; - if (contains_dollar_at) - *contains_dollar_at = 1; - return 1; - } /* [ */ - /* ${array[*]}, when unquoted, should be treated like ${array[@]}, - which should result in separate words even when IFS is unset. */ - if (temp1 && temp1[1] == '*' && temp1[2] == ']' && quoted == 0) - { - if (contains_dollar_at) - *contains_dollar_at = 1; - return 1; - } - } -#endif - return 0; -} - -/* Parameter expand NAME, and return a new string which is the expansion, - or NULL if there was no expansion. - VAR_IS_SPECIAL is non-zero if NAME is one of the special variables in - the shell, e.g., "@", "$", "*", etc. QUOTED, if non-zero, means that - NAME was found inside of a double-quoted expression. */ -static WORD_DESC * -parameter_brace_expand_word (name, var_is_special, quoted, pflags, indp) - char *name; - int var_is_special, quoted, pflags; - arrayind_t *indp; -{ - WORD_DESC *ret; - char *temp, *tt; - intmax_t arg_index; - SHELL_VAR *var; - int atype, rflags; - arrayind_t ind; - - ret = 0; - temp = 0; - rflags = 0; - - if (indp) - *indp = INTMAX_MIN; - - /* Handle multiple digit arguments, as in ${11}. */ - if (legal_number (name, &arg_index)) - { - tt = get_dollar_var_value (arg_index); - if (tt) - temp = (*tt && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - ? quote_string (tt) - : quote_escapes (tt); - else - temp = (char *)NULL; - FREE (tt); - } - else if (var_is_special) /* ${@} */ - { - int sindex; - tt = (char *)xmalloc (2 + strlen (name)); - tt[sindex = 0] = '$'; - strcpy (tt + 1, name); - - ret = param_expand (tt, &sindex, quoted, (int *)NULL, (int *)NULL, - (int *)NULL, (int *)NULL, pflags); - free (tt); - } -#if defined (ARRAY_VARS) - else if (valid_array_reference (name)) - { -expand_arrayref: - /* XXX - does this leak if name[@] or name[*]? */ - if (pflags & PF_ASSIGNRHS) - { - temp = array_variable_name (name, &tt, (int *)0); - if (ALL_ELEMENT_SUB (tt[0]) && tt[1] == ']') - temp = array_value (name, quoted|Q_DOUBLE_QUOTES, 0, &atype, &ind); - else - temp = array_value (name, quoted, 0, &atype, &ind); - } - else - temp = array_value (name, quoted, 0, &atype, &ind); - if (atype == 0 && temp) - { - temp = (*temp && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - ? quote_string (temp) - : quote_escapes (temp); - rflags |= W_ARRAYIND; - if (indp) - *indp = ind; - } - else if (atype == 1 && temp && QUOTED_NULL (temp) && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - rflags |= W_HASQUOTEDNULL; - } -#endif - else if (var = find_variable (name)) - { - if (var_isset (var) && invisible_p (var) == 0) - { -#if defined (ARRAY_VARS) - if (assoc_p (var)) - temp = assoc_reference (assoc_cell (var), "0"); - else if (array_p (var)) - temp = array_reference (array_cell (var), 0); - else - temp = value_cell (var); -#else - temp = value_cell (var); -#endif - - if (temp) - temp = (*temp && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - ? quote_string (temp) - : quote_escapes (temp); - } - else - temp = (char *)NULL; - } - else if (var = find_variable_last_nameref (name)) - { - temp = nameref_cell (var); -#if defined (ARRAY_VARS) - /* Handle expanding nameref whose value is x[n] */ - if (temp && *temp && valid_array_reference (temp)) - { - name = temp; - goto expand_arrayref; - } -#endif - /* y=2 ; typeset -n x=y; echo ${x} is not the same as echo ${2} in ksh */ - else if (temp && *temp && legal_identifier (temp) == 0) - { - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("%s: invalid variable name for name reference"), temp); - temp = &expand_param_error; - } - else - temp = (char *)NULL; - } - else - temp = (char *)NULL; - - if (ret == 0) - { - ret = alloc_word_desc (); - ret->word = temp; - ret->flags |= rflags; - } - return ret; -} - -/* Expand an indirect reference to a variable: ${!NAME} expands to the - value of the variable whose name is the value of NAME. */ -static WORD_DESC * -parameter_brace_expand_indir (name, var_is_special, quoted, quoted_dollar_atp, contains_dollar_at) - char *name; - int var_is_special, quoted; - int *quoted_dollar_atp, *contains_dollar_at; -{ - char *temp, *t; - WORD_DESC *w; - SHELL_VAR *v; - - /* See if it's a nameref first, behave in ksh93-compatible fashion. - There is at least one incompatibility: given ${!foo[0]} where foo=bar, - bash performs an indirect lookup on foo[0] and expands the result; - ksh93 expands bar[0]. We could do that here -- there are enough usable - primitives to do that -- but do not at this point. */ - if (var_is_special == 0 && (v = find_variable_last_nameref (name))) - { - if (nameref_p (v) && (t = nameref_cell (v)) && *t) - { - w = alloc_word_desc (); - w->word = savestring (t); - w->flags = 0; - return w; - } - } - - /* If var_is_special == 0, and name is not an array reference, this does - more expansion than necessary. It should really look up the variable's - value and not try to expand it. */ - w = parameter_brace_expand_word (name, var_is_special, quoted, PF_IGNUNBOUND, 0); - t = w->word; - /* Have to dequote here if necessary */ - if (t) - { - temp = (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) - ? dequote_string (t) - : dequote_escapes (t); - free (t); - t = temp; - } - dispose_word_desc (w); - - chk_atstar (t, quoted, quoted_dollar_atp, contains_dollar_at); - if (t == 0) - return (WORD_DESC *)NULL; - - w = parameter_brace_expand_word (t, SPECIAL_VAR(t, 0), quoted, 0, 0); - free (t); - - return w; -} - -/* Expand the right side of a parameter expansion of the form ${NAMEcVALUE}, - depending on the value of C, the separating character. C can be one of - "-", "+", or "=". QUOTED is true if the entire brace expression occurs - between double quotes. */ -static WORD_DESC * -parameter_brace_expand_rhs (name, value, c, quoted, qdollaratp, hasdollarat) - char *name, *value; - int c, quoted, *qdollaratp, *hasdollarat; -{ - WORD_DESC *w; - WORD_LIST *l; - char *t, *t1, *temp; - int hasdol; - - /* If the entire expression is between double quotes, we want to treat - the value as a double-quoted string, with the exception that we strip - embedded unescaped double quotes (for sh backwards compatibility). */ - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *value) - { - hasdol = 0; - temp = string_extract_double_quoted (value, &hasdol, 1); - } - else - temp = value; - - w = alloc_word_desc (); - hasdol = 0; - /* XXX was 0 not quoted */ - l = *temp ? expand_string_for_rhs (temp, quoted, &hasdol, (int *)NULL) - : (WORD_LIST *)0; - if (hasdollarat) - *hasdollarat = hasdol || (l && l->next); - if (temp != value) - free (temp); - if (l) - { - /* The expansion of TEMP returned something. We need to treat things - slightly differently if HASDOL is non-zero. If we have "$@", the - individual words have already been quoted. We need to turn them - into a string with the words separated by the first character of - $IFS without any additional quoting, so string_list_dollar_at won't - do the right thing. We use string_list_dollar_star instead. */ - temp = (hasdol || l->next) ? string_list_dollar_star (l) : string_list (l); - - /* If l->next is not null, we know that TEMP contained "$@", since that - is the only expansion that creates more than one word. */ - if (qdollaratp && ((hasdol && quoted) || l->next)) - *qdollaratp = 1; - /* If we have a quoted null result (QUOTED_NULL(temp)) and the word is - a quoted null (l->next == 0 && QUOTED_NULL(l->word->word)), the - flags indicate it (l->word->flags & W_HASQUOTEDNULL), and the - expansion is quoted (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - (which is more paranoia than anything else), we need to return the - quoted null string and set the flags to indicate it. */ - if (l->next == 0 && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && QUOTED_NULL (temp) && QUOTED_NULL (l->word->word) && (l->word->flags & W_HASQUOTEDNULL)) - { - w->flags |= W_HASQUOTEDNULL; - } - dispose_words (l); - } - else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && hasdol) - { - /* The brace expansion occurred between double quotes and there was - a $@ in TEMP. It does not matter if the $@ is quoted, as long as - it does not expand to anything. In this case, we want to return - a quoted empty string. */ - temp = make_quoted_char ('\0'); - w->flags |= W_HASQUOTEDNULL; - } - else - temp = (char *)NULL; - - if (c == '-' || c == '+') - { - w->word = temp; - return w; - } - - /* c == '=' */ - t = temp ? savestring (temp) : savestring (""); - t1 = dequote_string (t); - free (t); -#if defined (ARRAY_VARS) - if (valid_array_reference (name)) - assign_array_element (name, t1, 0); - else -#endif /* ARRAY_VARS */ - bind_variable (name, t1, 0); -#if 0 - if (STREQ (name, "IFS") == 0) -#endif - stupidly_hack_special_variables (name); - - /* From Posix group discussion Feb-March 2010. Issue 7 0000221 */ - free (temp); - - w->word = t1; - return w; -} - -/* Deal with the right hand side of a ${name:?value} expansion in the case - that NAME is null or not set. If VALUE is non-null it is expanded and - used as the error message to print, otherwise a standard message is - printed. */ -static void -parameter_brace_expand_error (name, value) - char *name, *value; -{ - WORD_LIST *l; - char *temp; - - last_command_exit_value = EXECUTION_FAILURE; /* ensure it's non-zero */ - if (value && *value) - { - l = expand_string (value, 0); - temp = string_list (l); - report_error ("%s: %s", name, temp ? temp : ""); /* XXX was value not "" */ - FREE (temp); - dispose_words (l); - } - else - report_error (_("%s: parameter null or not set"), name); - - /* Free the data we have allocated during this expansion, since we - are about to longjmp out. */ - free (name); - FREE (value); -} - -/* Return 1 if NAME is something for which parameter_brace_expand_length is - OK to do. */ -static int -valid_length_expression (name) - char *name; -{ - return (name[1] == '\0' || /* ${#} */ - ((sh_syntaxtab[(unsigned char) name[1]] & CSPECVAR) && name[2] == '\0') || /* special param */ - (DIGIT (name[1]) && all_digits (name + 1)) || /* ${#11} */ -#if defined (ARRAY_VARS) - valid_array_reference (name + 1) || /* ${#a[7]} */ -#endif - legal_identifier (name + 1)); /* ${#PS1} */ -} - -/* Handle the parameter brace expansion that requires us to return the - length of a parameter. */ -static intmax_t -parameter_brace_expand_length (name) - char *name; -{ - char *t, *newname; - intmax_t number, arg_index; - WORD_LIST *list; -#if defined (ARRAY_VARS) - SHELL_VAR *var; -#endif - - if (name[1] == '\0') /* ${#} */ - number = number_of_args (); - else if ((name[1] == '@' || name[1] == '*') && name[2] == '\0') /* ${#@}, ${#*} */ - number = number_of_args (); - else if ((sh_syntaxtab[(unsigned char) name[1]] & CSPECVAR) && name[2] == '\0') - { - /* Take the lengths of some of the shell's special parameters. */ - switch (name[1]) - { - case '-': - t = which_set_flags (); - break; - case '?': - t = itos (last_command_exit_value); - break; - case '$': - t = itos (dollar_dollar_pid); - break; - case '!': - if (last_asynchronous_pid == NO_PID) - t = (char *)NULL; /* XXX - error if set -u set? */ - else - t = itos (last_asynchronous_pid); - break; - case '#': - t = itos (number_of_args ()); - break; - } - number = STRLEN (t); - FREE (t); - } -#if defined (ARRAY_VARS) - else if (valid_array_reference (name + 1)) - number = array_length_reference (name + 1); -#endif /* ARRAY_VARS */ - else - { - number = 0; - - if (legal_number (name + 1, &arg_index)) /* ${#1} */ - { - t = get_dollar_var_value (arg_index); - if (t == 0 && unbound_vars_is_error) - return INTMAX_MIN; - number = MB_STRLEN (t); - FREE (t); - } -#if defined (ARRAY_VARS) - else if ((var = find_variable (name + 1)) && (invisible_p (var) == 0) && (array_p (var) || assoc_p (var))) - { - if (assoc_p (var)) - t = assoc_reference (assoc_cell (var), "0"); - else - t = array_reference (array_cell (var), 0); - if (t == 0 && unbound_vars_is_error) - return INTMAX_MIN; - number = MB_STRLEN (t); - } -#endif - else /* ${#PS1} */ - { - newname = savestring (name); - newname[0] = '$'; - list = expand_string (newname, Q_DOUBLE_QUOTES); - t = list ? string_list (list) : (char *)NULL; - free (newname); - if (list) - dispose_words (list); - - number = t ? MB_STRLEN (t) : 0; - FREE (t); - } - } - - return (number); -} - -/* Skip characters in SUBSTR until DELIM. SUBSTR is an arithmetic expression, - so we do some ad-hoc parsing of an arithmetic expression to find - the first DELIM, instead of using strchr(3). Two rules: - 1. If the substring contains a `(', read until closing `)'. - 2. If the substring contains a `?', read past one `:' for each `?'. -*/ - -static char * -skiparith (substr, delim) - char *substr; - int delim; -{ - size_t sublen; - int skipcol, pcount, i; - DECLARE_MBSTATE; - - sublen = strlen (substr); - i = skipcol = pcount = 0; - while (substr[i]) - { - /* Balance parens */ - if (substr[i] == LPAREN) - { - pcount++; - i++; - continue; - } - if (substr[i] == RPAREN && pcount) - { - pcount--; - i++; - continue; - } - if (pcount) - { - ADVANCE_CHAR (substr, sublen, i); - continue; - } - - /* Skip one `:' for each `?' */ - if (substr[i] == ':' && skipcol) - { - skipcol--; - i++; - continue; - } - if (substr[i] == delim) - break; - if (substr[i] == '?') - { - skipcol++; - i++; - continue; - } - ADVANCE_CHAR (substr, sublen, i); - } - - return (substr + i); -} - -/* Verify and limit the start and end of the desired substring. If - VTYPE == 0, a regular shell variable is being used; if it is 1, - then the positional parameters are being used; if it is 2, then - VALUE is really a pointer to an array variable that should be used. - Return value is 1 if both values were OK, 0 if there was a problem - with an invalid expression, or -1 if the values were out of range. */ -static int -verify_substring_values (v, value, substr, vtype, e1p, e2p) - SHELL_VAR *v; - char *value, *substr; - int vtype; - intmax_t *e1p, *e2p; -{ - char *t, *temp1, *temp2; - arrayind_t len; - int expok; -#if defined (ARRAY_VARS) - ARRAY *a; - HASH_TABLE *h; -#endif - - /* duplicate behavior of strchr(3) */ - t = skiparith (substr, ':'); - if (*t && *t == ':') - *t = '\0'; - else - t = (char *)0; - - temp1 = expand_arith_string (substr, Q_DOUBLE_QUOTES); - *e1p = evalexp (temp1, &expok); - free (temp1); - if (expok == 0) - return (0); - - len = -1; /* paranoia */ - switch (vtype) - { - case VT_VARIABLE: - case VT_ARRAYMEMBER: - len = MB_STRLEN (value); - break; - case VT_POSPARMS: - len = number_of_args () + 1; - if (*e1p == 0) - len++; /* add one arg if counting from $0 */ - break; -#if defined (ARRAY_VARS) - case VT_ARRAYVAR: - /* For arrays, the first value deals with array indices. Negative - offsets count from one past the array's maximum index. Associative - arrays treat the number of elements as the maximum index. */ - if (assoc_p (v)) - { - h = assoc_cell (v); - len = assoc_num_elements (h) + (*e1p < 0); - } - else - { - a = (ARRAY *)value; - len = array_max_index (a) + (*e1p < 0); /* arrays index from 0 to n - 1 */ - } - break; -#endif - } - - if (len == -1) /* paranoia */ - return -1; - - if (*e1p < 0) /* negative offsets count from end */ - *e1p += len; - - if (*e1p > len || *e1p < 0) - return (-1); - -#if defined (ARRAY_VARS) - /* For arrays, the second offset deals with the number of elements. */ - if (vtype == VT_ARRAYVAR) - len = assoc_p (v) ? assoc_num_elements (h) : array_num_elements (a); -#endif - - if (t) - { - t++; - temp2 = savestring (t); - temp1 = expand_arith_string (temp2, Q_DOUBLE_QUOTES); - free (temp2); - t[-1] = ':'; - *e2p = evalexp (temp1, &expok); - free (temp1); - if (expok == 0) - return (0); -#if 1 - if ((vtype == VT_ARRAYVAR || vtype == VT_POSPARMS) && *e2p < 0) -#else - /* bash-4.3: allow positional parameter length < 0 to count backwards - from end of positional parameters */ - if (vtype == VT_ARRAYVAR && *e2p < 0) -#endif - { - internal_error (_("%s: substring expression < 0"), t); - return (0); - } -#if defined (ARRAY_VARS) - /* In order to deal with sparse arrays, push the intelligence about how - to deal with the number of elements desired down to the array- - specific functions. */ - if (vtype != VT_ARRAYVAR) -#endif - { - if (*e2p < 0) - { - *e2p += len; - if (*e2p < 0 || *e2p < *e1p) - { - internal_error (_("%s: substring expression < 0"), t); - return (0); - } - } - else - *e2p += *e1p; /* want E2 chars starting at E1 */ - if (*e2p > len) - *e2p = len; - } - } - else - *e2p = len; - - return (1); -} - -/* Return the type of variable specified by VARNAME (simple variable, - positional param, or array variable). Also return the value specified - by VARNAME (value of a variable or a reference to an array element). - QUOTED is the standard description of quoting state, using Q_* defines. - FLAGS is currently a set of flags to pass to array_value. If IND is - non-null and not INTMAX_MIN, and FLAGS includes AV_USEIND, IND is - passed to array_value so the array index is not computed again. - If this returns VT_VARIABLE, the caller assumes that CTLESC and CTLNUL - characters in the value are quoted with CTLESC and takes appropriate - steps. For convenience, *VALP is set to the dequoted VALUE. */ -static int -get_var_and_type (varname, value, ind, quoted, flags, varp, valp) - char *varname, *value; - arrayind_t ind; - int quoted, flags; - SHELL_VAR **varp; - char **valp; -{ - int vtype; - char *temp; -#if defined (ARRAY_VARS) - SHELL_VAR *v; -#endif - arrayind_t lind; - - /* This sets vtype to VT_VARIABLE or VT_POSPARMS */ - vtype = (varname[0] == '@' || varname[0] == '*') && varname[1] == '\0'; - if (vtype == VT_POSPARMS && varname[0] == '*') - vtype |= VT_STARSUB; - *varp = (SHELL_VAR *)NULL; - -#if defined (ARRAY_VARS) - if (valid_array_reference (varname)) - { - v = array_variable_part (varname, &temp, (int *)0); - /* If we want to signal array_value to use an already-computed index, - set LIND to that index */ - lind = (ind != INTMAX_MIN && (flags & AV_USEIND)) ? ind : 0; - if (v && (array_p (v) || assoc_p (v))) - { /* [ */ - if (ALL_ELEMENT_SUB (temp[0]) && temp[1] == ']') - { - /* Callers have to differentiate betwen indexed and associative */ - vtype = VT_ARRAYVAR; - if (temp[0] == '*') - vtype |= VT_STARSUB; - *valp = array_p (v) ? (char *)array_cell (v) : (char *)assoc_cell (v); - } - else - { - vtype = VT_ARRAYMEMBER; - *valp = array_value (varname, Q_DOUBLE_QUOTES, flags, (int *)NULL, &lind); - } - *varp = v; - } - else if (v && (ALL_ELEMENT_SUB (temp[0]) && temp[1] == ']')) - { - vtype = VT_VARIABLE; - *varp = v; - if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) - *valp = dequote_string (value); - else - *valp = dequote_escapes (value); - } - else - { - vtype = VT_ARRAYMEMBER; - *varp = v; - *valp = array_value (varname, Q_DOUBLE_QUOTES, flags, (int *)NULL, &lind); - } - } - else if ((v = find_variable (varname)) && (invisible_p (v) == 0) && (assoc_p (v) || array_p (v))) - { - vtype = VT_ARRAYMEMBER; - *varp = v; - *valp = assoc_p (v) ? assoc_reference (assoc_cell (v), "0") : array_reference (array_cell (v), 0); - } - else -#endif - { - if (value && vtype == VT_VARIABLE) - { - if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) - *valp = dequote_string (value); - else - *valp = dequote_escapes (value); - } - else - *valp = value; - } - - return vtype; -} - -/******************************************************/ -/* */ -/* Functions to extract substrings of variable values */ -/* */ -/******************************************************/ - -#if defined (HANDLE_MULTIBYTE) -/* Character-oriented rather than strictly byte-oriented substrings. S and - E, rather being strict indices into STRING, indicate character (possibly - multibyte character) positions that require calculation. - Used by the ${param:offset[:length]} expansion. */ -static char * -mb_substring (string, s, e) - char *string; - int s, e; -{ - char *tt; - int start, stop, i, slen; - DECLARE_MBSTATE; - - start = 0; - /* Don't need string length in ADVANCE_CHAR unless multibyte chars possible. */ - slen = (MB_CUR_MAX > 1) ? STRLEN (string) : 0; - - i = s; - while (string[start] && i--) - ADVANCE_CHAR (string, slen, start); - stop = start; - i = e - s; - while (string[stop] && i--) - ADVANCE_CHAR (string, slen, stop); - tt = substring (string, start, stop); - return tt; -} -#endif - -/* Process a variable substring expansion: ${name:e1[:e2]}. If VARNAME - is `@', use the positional parameters; otherwise, use the value of - VARNAME. If VARNAME is an array variable, use the array elements. */ - -static char * -parameter_brace_substring (varname, value, ind, substr, quoted, flags) - char *varname, *value; - int ind; - char *substr; - int quoted, flags; -{ - intmax_t e1, e2; - int vtype, r, starsub; - char *temp, *val, *tt, *oname; - SHELL_VAR *v; - - if (value == 0) - return ((char *)NULL); - - oname = this_command_name; - this_command_name = varname; - - vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val); - if (vtype == -1) - { - this_command_name = oname; - return ((char *)NULL); - } - - starsub = vtype & VT_STARSUB; - vtype &= ~VT_STARSUB; - - r = verify_substring_values (v, val, substr, vtype, &e1, &e2); - this_command_name = oname; - if (r <= 0) - { - if (vtype == VT_VARIABLE) - FREE (val); - return ((r == 0) ? &expand_param_error : (char *)NULL); - } - - switch (vtype) - { - case VT_VARIABLE: - case VT_ARRAYMEMBER: -#if defined (HANDLE_MULTIBYTE) - if (MB_CUR_MAX > 1) - tt = mb_substring (val, e1, e2); - else -#endif - tt = substring (val, e1, e2); - - if (vtype == VT_VARIABLE) - FREE (val); - if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) - temp = quote_string (tt); - else - temp = tt ? quote_escapes (tt) : (char *)NULL; - FREE (tt); - break; - case VT_POSPARMS: - tt = pos_params (varname, e1, e2, quoted); - if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) == 0) - { - temp = tt ? quote_escapes (tt) : (char *)NULL; - FREE (tt); - } - else - temp = tt; - break; -#if defined (ARRAY_VARS) - case VT_ARRAYVAR: - if (assoc_p (v)) - /* we convert to list and take first e2 elements starting at e1th - element -- officially undefined for now */ - temp = assoc_subrange (assoc_cell (v), e1, e2, starsub, quoted); - else - /* We want E2 to be the number of elements desired (arrays can be sparse, - so verify_substring_values just returns the numbers specified and we - rely on array_subrange to understand how to deal with them). */ - temp = array_subrange (array_cell (v), e1, e2, starsub, quoted); - /* array_subrange now calls array_quote_escapes as appropriate, so the - caller no longer needs to. */ - break; -#endif - default: - temp = (char *)NULL; - } - - return temp; -} - -/****************************************************************/ -/* */ -/* Functions to perform pattern substitution on variable values */ -/* */ -/****************************************************************/ - -static int -shouldexp_replacement (s) - char *s; -{ - register char *p; - - for (p = s; p && *p; p++) - { - if (*p == '\\') - p++; - else if (*p == '&') - return 1; - } - return 0; -} - -char * -pat_subst (string, pat, rep, mflags) - char *string, *pat, *rep; - int mflags; -{ - char *ret, *s, *e, *str, *rstr, *mstr; - int rsize, rptr, l, replen, mtype, rxpand, rslen, mlen; - - if (string == 0) - return (savestring ("")); - - mtype = mflags & MATCH_TYPEMASK; - -#if 0 /* bash-4.2 ? */ - rxpand = (rep && *rep) ? shouldexp_replacement (rep) : 0; -#else - rxpand = 0; -#endif - - /* Special cases: - * 1. A null pattern with mtype == MATCH_BEG means to prefix STRING - * with REP and return the result. - * 2. A null pattern with mtype == MATCH_END means to append REP to - * STRING and return the result. - * These don't understand or process `&' in the replacement string. - */ - if ((pat == 0 || *pat == 0) && (mtype == MATCH_BEG || mtype == MATCH_END)) - { - replen = STRLEN (rep); - l = STRLEN (string); - ret = (char *)xmalloc (replen + l + 2); - if (replen == 0) - strcpy (ret, string); - else if (mtype == MATCH_BEG) - { - strcpy (ret, rep); - strcpy (ret + replen, string); - } - else - { - strcpy (ret, string); - strcpy (ret + l, rep); - } - return (ret); - } - - ret = (char *)xmalloc (rsize = 64); - ret[0] = '\0'; - - for (replen = STRLEN (rep), rptr = 0, str = string;;) - { - if (match_pattern (str, pat, mtype, &s, &e) == 0) - break; - l = s - str; - - if (rxpand) - { - int x; - mlen = e - s; - mstr = xmalloc (mlen + 1); - for (x = 0; x < mlen; x++) - mstr[x] = s[x]; - mstr[mlen] = '\0'; - rstr = strcreplace (rep, '&', mstr, 0); - rslen = strlen (rstr); - } - else - { - rstr = rep; - rslen = replen; - } - - RESIZE_MALLOCED_BUFFER (ret, rptr, (l + rslen), rsize, 64); - - /* OK, now copy the leading unmatched portion of the string (from - str to s) to ret starting at rptr (the current offset). Then copy - the replacement string at ret + rptr + (s - str). Increment - rptr (if necessary) and str and go on. */ - if (l) - { - strncpy (ret + rptr, str, l); - rptr += l; - } - if (replen) - { - strncpy (ret + rptr, rstr, rslen); - rptr += rslen; - } - str = e; /* e == end of match */ - - if (rstr != rep) - free (rstr); - - if (((mflags & MATCH_GLOBREP) == 0) || mtype != MATCH_ANY) - break; - - if (s == e) - { - /* On a zero-length match, make sure we copy one character, since - we increment one character to avoid infinite recursion. */ - RESIZE_MALLOCED_BUFFER (ret, rptr, 1, rsize, 64); - ret[rptr++] = *str++; - e++; /* avoid infinite recursion on zero-length match */ - } - } - - /* Now copy the unmatched portion of the input string */ - if (str && *str) - { - RESIZE_MALLOCED_BUFFER (ret, rptr, STRLEN(str) + 1, rsize, 64); - strcpy (ret + rptr, str); - } - else - ret[rptr] = '\0'; - - return ret; -} - -/* Do pattern match and replacement on the positional parameters. */ -static char * -pos_params_pat_subst (string, pat, rep, mflags) - char *string, *pat, *rep; - int mflags; -{ - WORD_LIST *save, *params; - WORD_DESC *w; - char *ret; - int pchar, qflags; - - save = params = list_rest_of_args (); - if (save == 0) - return ((char *)NULL); - - for ( ; params; params = params->next) - { - ret = pat_subst (params->word->word, pat, rep, mflags); - w = alloc_word_desc (); - w->word = ret ? ret : savestring (""); - dispose_word (params->word); - params->word = w; - } - - pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@'; - qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0; - - ret = string_list_pos_params (pchar, save, qflags); - - dispose_words (save); - - return (ret); -} - -/* Perform pattern substitution on VALUE, which is the expansion of - VARNAME. PATSUB is an expression supplying the pattern to match - and the string to substitute. QUOTED is a flags word containing - the type of quoting currently in effect. */ -static char * -parameter_brace_patsub (varname, value, ind, patsub, quoted, flags) - char *varname, *value; - int ind; - char *patsub; - int quoted, flags; -{ - int vtype, mflags, starsub, delim; - char *val, *temp, *pat, *rep, *p, *lpatsub, *tt; - SHELL_VAR *v; - - if (value == 0) - return ((char *)NULL); - - this_command_name = varname; - - vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val); - if (vtype == -1) - return ((char *)NULL); - - starsub = vtype & VT_STARSUB; - vtype &= ~VT_STARSUB; - - mflags = 0; - /* PATSUB is never NULL when this is called. */ - if (*patsub == '/') - { - mflags |= MATCH_GLOBREP; - patsub++; - } - - /* Malloc this because expand_string_if_necessary or one of the expansion - functions in its call chain may free it on a substitution error. */ - lpatsub = savestring (patsub); - - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - mflags |= MATCH_QUOTED; - - if (starsub) - mflags |= MATCH_STARSUB; - - /* If the pattern starts with a `/', make sure we skip over it when looking - for the replacement delimiter. */ - delim = skip_to_delim (lpatsub, ((*patsub == '/') ? 1 : 0), "/", 0); - if (lpatsub[delim] == '/') - { - lpatsub[delim] = 0; - rep = lpatsub + delim + 1; - } - else - rep = (char *)NULL; - - if (rep && *rep == '\0') - rep = (char *)NULL; - - /* Perform the same expansions on the pattern as performed by the - pattern removal expansions. */ - pat = getpattern (lpatsub, quoted, 1); - - if (rep) - { - /* We want to perform quote removal on the expanded replacement even if - the entire expansion is double-quoted because the parser and string - extraction functions treated quotes in the replacement string as - special. THIS IS NOT BACKWARDS COMPATIBLE WITH BASH-4.2. */ - if (shell_compatibility_level > 42) - rep = expand_string_if_necessary (rep, quoted & ~(Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT), expand_string_unsplit); - /* This is the bash-4.2 code. */ - else if ((mflags & MATCH_QUOTED) == 0) - rep = expand_string_if_necessary (rep, quoted, expand_string_unsplit); - else - rep = expand_string_to_string_internal (rep, quoted, expand_string_unsplit); - } - - /* ksh93 doesn't allow the match specifier to be a part of the expanded - pattern. This is an extension. Make sure we don't anchor the pattern - at the beginning or end of the string if we're doing global replacement, - though. */ - p = pat; - if (mflags & MATCH_GLOBREP) - mflags |= MATCH_ANY; - else if (pat && pat[0] == '#') - { - mflags |= MATCH_BEG; - p++; - } - else if (pat && pat[0] == '%') - { - mflags |= MATCH_END; - p++; - } - else - mflags |= MATCH_ANY; - - /* OK, we now want to substitute REP for PAT in VAL. If - flags & MATCH_GLOBREP is non-zero, the substitution is done - everywhere, otherwise only the first occurrence of PAT is - replaced. The pattern matching code doesn't understand - CTLESC quoting CTLESC and CTLNUL so we use the dequoted variable - values passed in (VT_VARIABLE) so the pattern substitution - code works right. We need to requote special chars after - we're done for VT_VARIABLE and VT_ARRAYMEMBER, and for the - other cases if QUOTED == 0, since the posparams and arrays - indexed by * or @ do special things when QUOTED != 0. */ - - switch (vtype) - { - case VT_VARIABLE: - case VT_ARRAYMEMBER: - temp = pat_subst (val, p, rep, mflags); - if (vtype == VT_VARIABLE) - FREE (val); - if (temp) - { - tt = (mflags & MATCH_QUOTED) ? quote_string (temp) : quote_escapes (temp); - free (temp); - temp = tt; - } - break; - case VT_POSPARMS: - temp = pos_params_pat_subst (val, p, rep, mflags); - if (temp && (mflags & MATCH_QUOTED) == 0) - { - tt = quote_escapes (temp); - free (temp); - temp = tt; - } - break; -#if defined (ARRAY_VARS) - case VT_ARRAYVAR: - temp = assoc_p (v) ? assoc_patsub (assoc_cell (v), p, rep, mflags) - : array_patsub (array_cell (v), p, rep, mflags); - /* Don't call quote_escapes anymore; array_patsub calls - array_quote_escapes as appropriate before adding the - space separators; ditto for assoc_patsub. */ - break; -#endif - } - - FREE (pat); - FREE (rep); - free (lpatsub); - - return temp; -} - -/****************************************************************/ -/* */ -/* Functions to perform case modification on variable values */ -/* */ -/****************************************************************/ - -/* Do case modification on the positional parameters. */ - -static char * -pos_params_modcase (string, pat, modop, mflags) - char *string, *pat; - int modop; - int mflags; -{ - WORD_LIST *save, *params; - WORD_DESC *w; - char *ret; - int pchar, qflags; - - save = params = list_rest_of_args (); - if (save == 0) - return ((char *)NULL); - - for ( ; params; params = params->next) - { - ret = sh_modcase (params->word->word, pat, modop); - w = alloc_word_desc (); - w->word = ret ? ret : savestring (""); - dispose_word (params->word); - params->word = w; - } - - pchar = (mflags & MATCH_STARSUB) == MATCH_STARSUB ? '*' : '@'; - qflags = (mflags & MATCH_QUOTED) == MATCH_QUOTED ? Q_DOUBLE_QUOTES : 0; - - ret = string_list_pos_params (pchar, save, qflags); - dispose_words (save); - - return (ret); -} - -/* Perform case modification on VALUE, which is the expansion of - VARNAME. MODSPEC is an expression supplying the type of modification - to perform. QUOTED is a flags word containing the type of quoting - currently in effect. */ -static char * -parameter_brace_casemod (varname, value, ind, modspec, patspec, quoted, flags) - char *varname, *value; - int ind, modspec; - char *patspec; - int quoted, flags; -{ - int vtype, starsub, modop, mflags, x; - char *val, *temp, *pat, *p, *lpat, *tt; - SHELL_VAR *v; - - if (value == 0) - return ((char *)NULL); - - this_command_name = varname; - - vtype = get_var_and_type (varname, value, ind, quoted, flags, &v, &val); - if (vtype == -1) - return ((char *)NULL); - - starsub = vtype & VT_STARSUB; - vtype &= ~VT_STARSUB; - - modop = 0; - mflags = 0; - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - mflags |= MATCH_QUOTED; - if (starsub) - mflags |= MATCH_STARSUB; - - p = patspec; - if (modspec == '^') - { - x = p && p[0] == modspec; - modop = x ? CASE_UPPER : CASE_UPFIRST; - p += x; - } - else if (modspec == ',') - { - x = p && p[0] == modspec; - modop = x ? CASE_LOWER : CASE_LOWFIRST; - p += x; - } - else if (modspec == '~') - { - x = p && p[0] == modspec; - modop = x ? CASE_TOGGLEALL : CASE_TOGGLE; - p += x; - } - - lpat = p ? savestring (p) : 0; - /* Perform the same expansions on the pattern as performed by the - pattern removal expansions. FOR LATER */ - pat = lpat ? getpattern (lpat, quoted, 1) : 0; - - /* OK, now we do the case modification. */ - switch (vtype) - { - case VT_VARIABLE: - case VT_ARRAYMEMBER: - temp = sh_modcase (val, pat, modop); - if (vtype == VT_VARIABLE) - FREE (val); - if (temp) - { - tt = (mflags & MATCH_QUOTED) ? quote_string (temp) : quote_escapes (temp); - free (temp); - temp = tt; - } - break; - - case VT_POSPARMS: - temp = pos_params_modcase (val, pat, modop, mflags); - if (temp && (mflags & MATCH_QUOTED) == 0) - { - tt = quote_escapes (temp); - free (temp); - temp = tt; - } - break; - -#if defined (ARRAY_VARS) - case VT_ARRAYVAR: - temp = assoc_p (v) ? assoc_modcase (assoc_cell (v), pat, modop, mflags) - : array_modcase (array_cell (v), pat, modop, mflags); - /* Don't call quote_escapes; array_modcase calls array_quote_escapes - as appropriate before adding the space separators; ditto for - assoc_modcase. */ - break; -#endif - } - - FREE (pat); - free (lpat); - - return temp; -} - -/* Check for unbalanced parens in S, which is the contents of $(( ... )). If - any occur, this must be a nested command substitution, so return 0. - Otherwise, return 1. A valid arithmetic expression must always have a - ( before a matching ), so any cases where there are more right parens - means that this must not be an arithmetic expression, though the parser - will not accept it without a balanced total number of parens. */ -static int -chk_arithsub (s, len) - const char *s; - int len; -{ - int i, count; - DECLARE_MBSTATE; - - i = count = 0; - while (i < len) - { - if (s[i] == LPAREN) - count++; - else if (s[i] == RPAREN) - { - count--; - if (count < 0) - return 0; - } - - switch (s[i]) - { - default: - ADVANCE_CHAR (s, len, i); - break; - - case '\\': - i++; - if (s[i]) - ADVANCE_CHAR (s, len, i); - break; - - case '\'': - i = skip_single_quoted (s, len, ++i); - break; - - case '"': - i = skip_double_quoted ((char *)s, len, ++i); - break; - } - } - - return (count == 0); -} - -/****************************************************************/ -/* */ -/* Functions to perform parameter expansion on a string */ -/* */ -/****************************************************************/ - -/* ${[#][!]name[[:][^[^]][,[,]]#[#]%[%]-=?+[word][:e1[:e2]]]} */ -static WORD_DESC * -parameter_brace_expand (string, indexp, quoted, pflags, quoted_dollar_atp, contains_dollar_at) - char *string; - int *indexp, quoted, *quoted_dollar_atp, *contains_dollar_at, pflags; -{ - int check_nullness, var_is_set, var_is_null, var_is_special; - int want_substring, want_indir, want_patsub, want_casemod; - char *name, *value, *temp, *temp1; - WORD_DESC *tdesc, *ret; - int t_index, sindex, c, tflag, modspec; - intmax_t number; - arrayind_t ind; - - temp = temp1 = value = (char *)NULL; - var_is_set = var_is_null = var_is_special = check_nullness = 0; - want_substring = want_indir = want_patsub = want_casemod = 0; - - sindex = *indexp; - t_index = ++sindex; - /* ${#var} doesn't have any of the other parameter expansions on it. */ - if (string[t_index] == '#' && legal_variable_starter (string[t_index+1])) /* {{ */ - name = string_extract (string, &t_index, "}", SX_VARNAME); - else -#if defined (CASEMOD_EXPANSIONS) - /* To enable case-toggling expansions using the `~' operator character - change the 1 to 0. */ -# if defined (CASEMOD_CAPCASE) - name = string_extract (string, &t_index, "#%^,~:-=?+/}", SX_VARNAME); -# else - name = string_extract (string, &t_index, "#%^,:-=?+/}", SX_VARNAME); -# endif /* CASEMOD_CAPCASE */ -#else - name = string_extract (string, &t_index, "#%:-=?+/}", SX_VARNAME); -#endif /* CASEMOD_EXPANSIONS */ - - ret = 0; - tflag = 0; - - ind = INTMAX_MIN; - - /* If the name really consists of a special variable, then make sure - that we have the entire name. We don't allow indirect references - to special variables except `#', `?', `@' and `*'. */ - if ((sindex == t_index && VALID_SPECIAL_LENGTH_PARAM (string[t_index])) || - (sindex == t_index - 1 && string[sindex] == '!' && VALID_INDIR_PARAM (string[t_index]))) - { - t_index++; - temp1 = string_extract (string, &t_index, "#%:-=?+/}", 0); - name = (char *)xrealloc (name, 3 + (strlen (temp1))); - *name = string[sindex]; - if (string[sindex] == '!') - { - /* indirect reference of $#, $?, $@, or $* */ - name[1] = string[sindex + 1]; - strcpy (name + 2, temp1); - } - else - strcpy (name + 1, temp1); - free (temp1); - } - sindex = t_index; - - /* Find out what character ended the variable name. Then - do the appropriate thing. */ - if (c = string[sindex]) - sindex++; - - /* If c is followed by one of the valid parameter expansion - characters, move past it as normal. If not, assume that - a substring specification is being given, and do not move - past it. */ - if (c == ':' && VALID_PARAM_EXPAND_CHAR (string[sindex])) - { - check_nullness++; - if (c = string[sindex]) - sindex++; - } - else if (c == ':' && string[sindex] != RBRACE) - want_substring = 1; - else if (c == '/' /* && string[sindex] != RBRACE */) /* XXX */ - want_patsub = 1; -#if defined (CASEMOD_EXPANSIONS) - else if (c == '^' || c == ',' || c == '~') - { - modspec = c; - want_casemod = 1; - } -#endif - - /* Catch the valid and invalid brace expressions that made it through the - tests above. */ - /* ${#-} is a valid expansion and means to take the length of $-. - Similarly for ${#?} and ${##}... */ - if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && - VALID_SPECIAL_LENGTH_PARAM (c) && string[sindex] == RBRACE) - { - name = (char *)xrealloc (name, 3); - name[1] = c; - name[2] = '\0'; - c = string[sindex++]; - } - - /* ...but ${#%}, ${#:}, ${#=}, ${#+}, and ${#/} are errors. */ - if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && - member (c, "%:=+/") && string[sindex] == RBRACE) - { - temp = (char *)NULL; - goto bad_substitution; - } - - /* Indirect expansion begins with a `!'. A valid indirect expansion is - either a variable name, one of the positional parameters or a special - variable that expands to one of the positional parameters. */ - want_indir = *name == '!' && - (legal_variable_starter ((unsigned char)name[1]) || DIGIT (name[1]) - || VALID_INDIR_PARAM (name[1])); - - /* Determine the value of this variable. */ - - /* Check for special variables, directly referenced. */ - if (SPECIAL_VAR (name, want_indir)) - var_is_special++; - - /* Check for special expansion things, like the length of a parameter */ - if (*name == '#' && name[1]) - { - /* If we are not pointing at the character just after the - closing brace, then we haven't gotten all of the name. - Since it begins with a special character, this is a bad - substitution. Also check NAME for validity before trying - to go on. */ - if (string[sindex - 1] != RBRACE || (valid_length_expression (name) == 0)) - { - temp = (char *)NULL; - goto bad_substitution; - } - - number = parameter_brace_expand_length (name); - if (number == INTMAX_MIN && unbound_vars_is_error) - { - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (name+1); - free (name); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } - free (name); - - *indexp = sindex; - if (number < 0) - return (&expand_wdesc_error); - else - { - ret = alloc_word_desc (); - ret->word = itos (number); - return ret; - } - } - - /* ${@} is identical to $@. */ - if (name[0] == '@' && name[1] == '\0') - { - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 1; - - if (contains_dollar_at) - *contains_dollar_at = 1; - - tflag |= W_DOLLARAT; - } - - /* Process ${!PREFIX*} expansion. */ - if (want_indir && string[sindex - 1] == RBRACE && - (string[sindex - 2] == '*' || string[sindex - 2] == '@') && - legal_variable_starter ((unsigned char) name[1])) - { - char **x; - WORD_LIST *xlist; - - temp1 = savestring (name + 1); - number = strlen (temp1); - temp1[number - 1] = '\0'; - x = all_variables_matching_prefix (temp1); - xlist = strvec_to_word_list (x, 0, 0); - if (string[sindex - 2] == '*') - temp = string_list_dollar_star (xlist); - else - { - temp = string_list_dollar_at (xlist, quoted); - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 1; - if (contains_dollar_at) - *contains_dollar_at = 1; - - tflag |= W_DOLLARAT; - } - free (x); - dispose_words (xlist); - free (temp1); - *indexp = sindex; - - free (name); - - ret = alloc_word_desc (); - ret->word = temp; - ret->flags = tflag; /* XXX */ - return ret; - } - -#if defined (ARRAY_VARS) - /* Process ${!ARRAY[@]} and ${!ARRAY[*]} expansion. */ /* [ */ - if (want_indir && string[sindex - 1] == RBRACE && - string[sindex - 2] == ']' && valid_array_reference (name+1)) - { - char *x, *x1; - - temp1 = savestring (name + 1); - x = array_variable_name (temp1, &x1, (int *)0); /* [ */ - FREE (x); - if (ALL_ELEMENT_SUB (x1[0]) && x1[1] == ']') - { - temp = array_keys (temp1, quoted); /* handles assoc vars too */ - if (x1[0] == '@') - { - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 1; - if (contains_dollar_at) - *contains_dollar_at = 1; - - tflag |= W_DOLLARAT; - } - - free (temp1); - *indexp = sindex; - - ret = alloc_word_desc (); - ret->word = temp; - ret->flags = tflag; /* XXX */ - return ret; - } - - free (temp1); - } -#endif /* ARRAY_VARS */ - - /* Make sure that NAME is valid before trying to go on. */ - if (valid_brace_expansion_word (want_indir ? name + 1 : name, - var_is_special) == 0) - { - temp = (char *)NULL; - goto bad_substitution; - } - - if (want_indir) - tdesc = parameter_brace_expand_indir (name + 1, var_is_special, quoted, quoted_dollar_atp, contains_dollar_at); - else - tdesc = parameter_brace_expand_word (name, var_is_special, quoted, PF_IGNUNBOUND|(pflags&(PF_NOSPLIT2|PF_ASSIGNRHS)), &ind); - - if (tdesc) - { - temp = tdesc->word; - tflag = tdesc->flags; - dispose_word_desc (tdesc); - } - else - temp = (char *)0; - - if (temp == &expand_param_error || temp == &expand_param_fatal) - { - FREE (name); - FREE (value); - return (temp == &expand_param_error ? &expand_wdesc_error : &expand_wdesc_fatal); - } - -#if defined (ARRAY_VARS) - if (valid_array_reference (name)) - chk_atstar (name, quoted, quoted_dollar_atp, contains_dollar_at); -#endif - - var_is_set = temp != (char *)0; - var_is_null = check_nullness && (var_is_set == 0 || *temp == 0); - /* XXX - this may not need to be restricted to special variables */ - if (check_nullness) - var_is_null |= var_is_set && var_is_special && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && QUOTED_NULL (temp); - - /* Get the rest of the stuff inside the braces. */ - if (c && c != RBRACE) - { - /* Extract the contents of the ${ ... } expansion - according to the Posix.2 rules. */ - value = extract_dollar_brace_string (string, &sindex, quoted, (c == '%' || c == '#' || c =='/' || c == '^' || c == ',' || c ==':') ? SX_POSIXEXP|SX_WORD : SX_WORD); - if (string[sindex] == RBRACE) - sindex++; - else - goto bad_substitution; - } - else - value = (char *)NULL; - - *indexp = sindex; - - /* All the cases where an expansion can possibly generate an unbound - variable error. */ - if (want_substring || want_patsub || want_casemod || c == '#' || c == '%' || c == RBRACE) - { - if (var_is_set == 0 && unbound_vars_is_error && ((name[0] != '@' && name[0] != '*') || name[1])) - { - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (name); - FREE (value); - FREE (temp); - free (name); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } - } - - /* If this is a substring spec, process it and add the result. */ - if (want_substring) - { - temp1 = parameter_brace_substring (name, temp, ind, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0); - FREE (name); - FREE (value); - FREE (temp); - - if (temp1 == &expand_param_error) - return (&expand_wdesc_error); - else if (temp1 == &expand_param_fatal) - return (&expand_wdesc_fatal); - - ret = alloc_word_desc (); - ret->word = temp1; - if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ret->flags |= W_QUOTED|W_HASQUOTEDNULL; - return ret; - } - else if (want_patsub) - { - temp1 = parameter_brace_patsub (name, temp, ind, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0); - FREE (name); - FREE (value); - FREE (temp); - - if (temp1 == &expand_param_error) - return (&expand_wdesc_error); - else if (temp1 == &expand_param_fatal) - return (&expand_wdesc_fatal); - - ret = alloc_word_desc (); - ret->word = temp1; - if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ret->flags |= W_QUOTED|W_HASQUOTEDNULL; - return ret; - } -#if defined (CASEMOD_EXPANSIONS) - else if (want_casemod) - { - temp1 = parameter_brace_casemod (name, temp, ind, modspec, value, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0); - FREE (name); - FREE (value); - FREE (temp); - - if (temp1 == &expand_param_error) - return (&expand_wdesc_error); - else if (temp1 == &expand_param_fatal) - return (&expand_wdesc_fatal); - - ret = alloc_word_desc (); - ret->word = temp1; - if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ret->flags |= W_QUOTED|W_HASQUOTEDNULL; - return ret; - } -#endif - - /* Do the right thing based on which character ended the variable name. */ - switch (c) - { - default: - case '\0': - bad_substitution: - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("%s: bad substitution"), string ? string : "??"); - FREE (value); - FREE (temp); - free (name); - return &expand_wdesc_error; - - case RBRACE: - break; - - case '#': /* ${param#[#]pattern} */ - case '%': /* ${param%[%]pattern} */ - if (value == 0 || *value == '\0' || temp == 0 || *temp == '\0') - { - FREE (value); - break; - } - temp1 = parameter_brace_remove_pattern (name, temp, ind, value, c, quoted, (tflag & W_ARRAYIND) ? AV_USEIND : 0); - free (temp); - free (value); - free (name); - - ret = alloc_word_desc (); - ret->word = temp1; - if (temp1 && QUOTED_NULL (temp1) && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ret->flags |= W_QUOTED|W_HASQUOTEDNULL; - return ret; - - case '-': - case '=': - case '?': - case '+': - if (var_is_set && var_is_null == 0) - { - /* If the operator is `+', we don't want the value of the named - variable for anything, just the value of the right hand side. */ - if (c == '+') - { - /* XXX -- if we're double-quoted and the named variable is "$@", - we want to turn off any special handling of "$@" -- - we're not using it, so whatever is on the rhs applies. */ - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 0; - if (contains_dollar_at) - *contains_dollar_at = 0; - - FREE (temp); - if (value) - { - /* From Posix discussion on austin-group list. Issue 221 - requires that backslashes escaping `}' inside - double-quoted ${...} be removed. */ - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - quoted |= Q_DOLBRACE; - ret = parameter_brace_expand_rhs (name, value, c, - quoted, - quoted_dollar_atp, - contains_dollar_at); - /* XXX - fix up later, esp. noting presence of - W_HASQUOTEDNULL in ret->flags */ - free (value); - } - else - temp = (char *)NULL; - } - else - { - FREE (value); - } - /* Otherwise do nothing; just use the value in TEMP. */ - } - else /* VAR not set or VAR is NULL. */ - { - FREE (temp); - temp = (char *)NULL; - if (c == '=' && var_is_special) - { - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("$%s: cannot assign in this way"), name); - free (name); - free (value); - return &expand_wdesc_error; - } - else if (c == '?') - { - parameter_brace_expand_error (name, value); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } - else if (c != '+') - { - /* XXX -- if we're double-quoted and the named variable is "$@", - we want to turn off any special handling of "$@" -- - we're not using it, so whatever is on the rhs applies. */ - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) - *quoted_dollar_atp = 0; - if (contains_dollar_at) - *contains_dollar_at = 0; - - /* From Posix discussion on austin-group list. Issue 221 requires - that backslashes escaping `}' inside double-quoted ${...} be - removed. */ - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - quoted |= Q_DOLBRACE; - ret = parameter_brace_expand_rhs (name, value, c, quoted, - quoted_dollar_atp, - contains_dollar_at); - /* XXX - fix up later, esp. noting presence of - W_HASQUOTEDNULL in tdesc->flags */ - } - free (value); - } - - break; - } - free (name); - - if (ret == 0) - { - ret = alloc_word_desc (); - ret->flags = tflag; - ret->word = temp; - } - return (ret); -} - -/* Expand a single ${xxx} expansion. The braces are optional. When - the braces are used, parameter_brace_expand() does the work, - possibly calling param_expand recursively. */ -static WORD_DESC * -param_expand (string, sindex, quoted, expanded_something, - contains_dollar_at, quoted_dollar_at_p, had_quoted_null_p, - pflags) - char *string; - int *sindex, quoted, *expanded_something, *contains_dollar_at; - int *quoted_dollar_at_p, *had_quoted_null_p, pflags; -{ - char *temp, *temp1, uerror[3]; - int zindex, t_index, expok; - unsigned char c; - intmax_t number; - SHELL_VAR *var; - WORD_LIST *list; - WORD_DESC *tdesc, *ret; - int tflag; - - zindex = *sindex; - c = string[++zindex]; - - temp = (char *)NULL; - ret = tdesc = (WORD_DESC *)NULL; - tflag = 0; - - /* Do simple cases first. Switch on what follows '$'. */ - switch (c) - { - /* $0 .. $9? */ - case '0': - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - case '7': - case '8': - case '9': - temp1 = dollar_vars[TODIGIT (c)]; - if (unbound_vars_is_error && temp1 == (char *)NULL) - { - uerror[0] = '$'; - uerror[1] = c; - uerror[2] = '\0'; - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (uerror); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } - if (temp1) - temp = (*temp1 && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ? quote_string (temp1) - : quote_escapes (temp1); - else - temp = (char *)NULL; - - break; - - /* $$ -- pid of the invoking shell. */ - case '$': - temp = itos (dollar_dollar_pid); - break; - - /* $# -- number of positional parameters. */ - case '#': - temp = itos (number_of_args ()); - break; - - /* $? -- return value of the last synchronous command. */ - case '?': - temp = itos (last_command_exit_value); - break; - - /* $- -- flags supplied to the shell on invocation or by `set'. */ - case '-': - temp = which_set_flags (); - break; - - /* $! -- Pid of the last asynchronous command. */ - case '!': - /* If no asynchronous pids have been created, expand to nothing. - If `set -u' has been executed, and no async processes have - been created, this is an expansion error. */ - if (last_asynchronous_pid == NO_PID) - { - if (expanded_something) - *expanded_something = 0; - temp = (char *)NULL; - if (unbound_vars_is_error) - { - uerror[0] = '$'; - uerror[1] = c; - uerror[2] = '\0'; - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (uerror); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } - } - else - temp = itos (last_asynchronous_pid); - break; - - /* The only difference between this and $@ is when the arg is quoted. */ - case '*': /* `$*' */ - list = list_rest_of_args (); - -#if 0 - /* According to austin-group posix proposal by Geoff Clare in - <20090505091501.GA10097@squonk.masqnet> of 5 May 2009: - - "The shell shall write a message to standard error and - immediately exit when it tries to expand an unset parameter - other than the '@' and '*' special parameters." - */ - - if (list == 0 && unbound_vars_is_error && (pflags & PF_IGNUNBOUND) == 0) - { - uerror[0] = '$'; - uerror[1] = '*'; - uerror[2] = '\0'; - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (uerror); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } -#endif - - /* If there are no command-line arguments, this should just - disappear if there are other characters in the expansion, - even if it's quoted. */ - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && list == 0) - temp = (char *)NULL; - else if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES|Q_PATQUOTE)) - { - /* If we have "$*" we want to make a string of the positional - parameters, separated by the first character of $IFS, and - quote the whole string, including the separators. If IFS - is unset, the parameters are separated by ' '; if $IFS is - null, the parameters are concatenated. */ - temp = (quoted & (Q_DOUBLE_QUOTES|Q_PATQUOTE)) ? string_list_dollar_star (list) : string_list (list); - if (temp) - { - temp1 = quote_string (temp); - if (*temp == 0) - tflag |= W_HASQUOTEDNULL; - free (temp); - temp = temp1; - } - } - else - { - /* We check whether or not we're eventually going to split $* here, - for example when IFS is empty and we are processing the rhs of - an assignment statement. In that case, we don't separate the - arguments at all. Otherwise, if the $* is not quoted it is - identical to $@ */ -# if defined (HANDLE_MULTIBYTE) - if (expand_no_split_dollar_star && ifs_firstc[0] == 0) -# else - if (expand_no_split_dollar_star && ifs_firstc == 0) -# endif - temp = string_list_dollar_star (list); - else - { - temp = string_list_dollar_at (list, quoted); - if (quoted == 0 && (ifs_is_set == 0 || ifs_is_null)) - tflag |= W_SPLITSPACE; - } - - if (expand_no_split_dollar_star == 0 && contains_dollar_at) - *contains_dollar_at = 1; - } - - dispose_words (list); - break; - - /* When we have "$@" what we want is "$1" "$2" "$3" ... This - means that we have to turn quoting off after we split into - the individually quoted arguments so that the final split - on the first character of $IFS is still done. */ - case '@': /* `$@' */ - list = list_rest_of_args (); - -#if 0 - /* According to austin-group posix proposal by Geoff Clare in - <20090505091501.GA10097@squonk.masqnet> of 5 May 2009: - - "The shell shall write a message to standard error and - immediately exit when it tries to expand an unset parameter - other than the '@' and '*' special parameters." - */ - - if (list == 0 && unbound_vars_is_error && (pflags & PF_IGNUNBOUND) == 0) - { - uerror[0] = '$'; - uerror[1] = '@'; - uerror[2] = '\0'; - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (uerror); - return (interactive_shell ? &expand_wdesc_error : &expand_wdesc_fatal); - } -#endif - - /* We want to flag the fact that we saw this. We can't turn - off quoting entirely, because other characters in the - string might need it (consider "\"$@\""), but we need some - way to signal that the final split on the first character - of $IFS should be done, even though QUOTED is 1. */ - /* XXX - should this test include Q_PATQUOTE? */ - if (quoted_dollar_at_p && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - *quoted_dollar_at_p = 1; - if (contains_dollar_at) - *contains_dollar_at = 1; - - /* We want to separate the positional parameters with the first - character of $IFS in case $IFS is something other than a space. - We also want to make sure that splitting is done no matter what -- - according to POSIX.2, this expands to a list of the positional - parameters no matter what IFS is set to. */ - temp = string_list_dollar_at (list, (pflags & PF_ASSIGNRHS) ? (quoted|Q_DOUBLE_QUOTES) : quoted); - - tflag |= W_DOLLARAT; - dispose_words (list); - break; - - case LBRACE: - tdesc = parameter_brace_expand (string, &zindex, quoted, pflags, - quoted_dollar_at_p, - contains_dollar_at); - - if (tdesc == &expand_wdesc_error || tdesc == &expand_wdesc_fatal) - return (tdesc); - temp = tdesc ? tdesc->word : (char *)0; - - /* XXX */ - /* Quoted nulls should be removed if there is anything else - in the string. */ - /* Note that we saw the quoted null so we can add one back at - the end of this function if there are no other characters - in the string, discard TEMP, and go on. The exception to - this is when we have "${@}" and $1 is '', since $@ needs - special handling. */ - if (tdesc && tdesc->word && (tdesc->flags & W_HASQUOTEDNULL) && QUOTED_NULL (temp)) - { - if (had_quoted_null_p) - *had_quoted_null_p = 1; - if (*quoted_dollar_at_p == 0) - { - free (temp); - tdesc->word = temp = (char *)NULL; - } - - } - - ret = tdesc; - goto return0; - - /* Do command or arithmetic substitution. */ - case LPAREN: - /* We have to extract the contents of this paren substitution. */ - t_index = zindex + 1; - temp = extract_command_subst (string, &t_index, 0); - zindex = t_index; - - /* For Posix.2-style `$(( ))' arithmetic substitution, - extract the expression and pass it to the evaluator. */ - if (temp && *temp == LPAREN) - { - char *temp2; - temp1 = temp + 1; - temp2 = savestring (temp1); - t_index = strlen (temp2) - 1; - - if (temp2[t_index] != RPAREN) - { - free (temp2); - goto comsub; - } - - /* Cut off ending `)' */ - temp2[t_index] = '\0'; - - if (chk_arithsub (temp2, t_index) == 0) - { - free (temp2); -#if 0 - internal_warning (_("future versions of the shell will force evaluation as an arithmetic substitution")); -#endif - goto comsub; - } - - /* Expand variables found inside the expression. */ - temp1 = expand_arith_string (temp2, Q_DOUBLE_QUOTES); - free (temp2); - -arithsub: - /* No error messages. */ - this_command_name = (char *)NULL; - number = evalexp (temp1, &expok); - free (temp); - free (temp1); - if (expok == 0) - { - if (interactive_shell == 0 && posixly_correct) - { - last_command_exit_value = EXECUTION_FAILURE; - return (&expand_wdesc_fatal); - } - else - return (&expand_wdesc_error); - } - temp = itos (number); - break; - } - -comsub: - if (pflags & PF_NOCOMSUB) - /* we need zindex+1 because string[zindex] == RPAREN */ - temp1 = substring (string, *sindex, zindex+1); - else - { - tdesc = command_substitute (temp, quoted); - temp1 = tdesc ? tdesc->word : (char *)NULL; - if (tdesc) - dispose_word_desc (tdesc); - } - FREE (temp); - temp = temp1; - break; - - /* Do POSIX.2d9-style arithmetic substitution. This will probably go - away in a future bash release. */ - case '[': - /* Extract the contents of this arithmetic substitution. */ - t_index = zindex + 1; - temp = extract_arithmetic_subst (string, &t_index); - zindex = t_index; - if (temp == 0) - { - temp = savestring (string); - if (expanded_something) - *expanded_something = 0; - goto return0; - } - - /* Do initial variable expansion. */ - temp1 = expand_arith_string (temp, Q_DOUBLE_QUOTES); - - goto arithsub; - - default: - /* Find the variable in VARIABLE_LIST. */ - temp = (char *)NULL; - - for (t_index = zindex; (c = string[zindex]) && legal_variable_char (c); zindex++) - ; - temp1 = (zindex > t_index) ? substring (string, t_index, zindex) : (char *)NULL; - - /* If this isn't a variable name, then just output the `$'. */ - if (temp1 == 0 || *temp1 == '\0') - { - FREE (temp1); - temp = (char *)xmalloc (2); - temp[0] = '$'; - temp[1] = '\0'; - if (expanded_something) - *expanded_something = 0; - goto return0; - } - - /* If the variable exists, return its value cell. */ - var = find_variable (temp1); - - if (var && invisible_p (var) == 0 && var_isset (var)) - { -#if defined (ARRAY_VARS) - if (assoc_p (var) || array_p (var)) - { - temp = array_p (var) ? array_reference (array_cell (var), 0) - : assoc_reference (assoc_cell (var), "0"); - if (temp) - temp = (*temp && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ? quote_string (temp) - : quote_escapes (temp); - else if (unbound_vars_is_error) - goto unbound_variable; - } - else -#endif - { - temp = value_cell (var); - - temp = (*temp && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) - ? quote_string (temp) - : quote_escapes (temp); - } - - free (temp1); - - goto return0; - } - else if (var = find_variable_last_nameref (temp1)) - { - temp = nameref_cell (var); -#if defined (ARRAY_VARS) - if (temp && *temp && valid_array_reference (temp)) - { - tdesc = parameter_brace_expand_word (temp, SPECIAL_VAR (temp, 0), quoted, pflags, (arrayind_t *)NULL); - if (tdesc == &expand_wdesc_error || tdesc == &expand_wdesc_fatal) - return (tdesc); - ret = tdesc; - goto return0; - } - else -#endif - /* y=2 ; typeset -n x=y; echo $x is not the same as echo $2 in ksh */ - if (temp && *temp && legal_identifier (temp) == 0) - { - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("%s: invalid variable name for name reference"), temp); - return (&expand_wdesc_error); /* XXX */ - } - else - temp = (char *)NULL; - } - - temp = (char *)NULL; - -unbound_variable: - if (unbound_vars_is_error) - { - last_command_exit_value = EXECUTION_FAILURE; - err_unboundvar (temp1); - } - else - { - free (temp1); - goto return0; - } - - free (temp1); - last_command_exit_value = EXECUTION_FAILURE; - return ((unbound_vars_is_error && interactive_shell == 0) - ? &expand_wdesc_fatal - : &expand_wdesc_error); - } - - if (string[zindex]) - zindex++; - -return0: - *sindex = zindex; - - if (ret == 0) - { - ret = alloc_word_desc (); - ret->flags = tflag; /* XXX */ - ret->word = temp; - } - return ret; -} - -/* Make a word list which is the result of parameter and variable - expansion, command substitution, arithmetic substitution, and - quote removal of WORD. Return a pointer to a WORD_LIST which is - the result of the expansion. If WORD contains a null word, the - word list returned is also null. - - QUOTED contains flag values defined in shell.h. - - ISEXP is used to tell expand_word_internal that the word should be - treated as the result of an expansion. This has implications for - how IFS characters in the word are treated. - - CONTAINS_DOLLAR_AT and EXPANDED_SOMETHING are return values; when non-null - they point to an integer value which receives information about expansion. - CONTAINS_DOLLAR_AT gets non-zero if WORD contained "$@", else zero. - EXPANDED_SOMETHING get non-zero if WORD contained any parameter expansions, - else zero. - - This only does word splitting in the case of $@ expansion. In that - case, we split on ' '. */ - -/* Values for the local variable quoted_state. */ -#define UNQUOTED 0 -#define PARTIALLY_QUOTED 1 -#define WHOLLY_QUOTED 2 - -static WORD_LIST * -expand_word_internal (word, quoted, isexp, contains_dollar_at, expanded_something) - WORD_DESC *word; - int quoted, isexp; - int *contains_dollar_at; - int *expanded_something; -{ - WORD_LIST *list; - WORD_DESC *tword; - - /* The intermediate string that we build while expanding. */ - char *istring; - - /* The current size of the above object. */ - int istring_size; - - /* Index into ISTRING. */ - int istring_index; - - /* Temporary string storage. */ - char *temp, *temp1; - - /* The text of WORD. */ - register char *string; - - /* The size of STRING. */ - size_t string_size; - - /* The index into STRING. */ - int sindex; - - /* This gets 1 if we see a $@ while quoted. */ - int quoted_dollar_at; - - /* One of UNQUOTED, PARTIALLY_QUOTED, or WHOLLY_QUOTED, depending on - whether WORD contains no quoting characters, a partially quoted - string (e.g., "xx"ab), or is fully quoted (e.g., "xxab"). */ - int quoted_state; - - /* State flags */ - int had_quoted_null; - int has_dollar_at, temp_has_dollar_at; - int split_on_spaces; - int tflag; - int pflags; /* flags passed to param_expand */ - - int assignoff; /* If assignment, offset of `=' */ - - register unsigned char c; /* Current character. */ - int t_index; /* For calls to string_extract_xxx. */ - - char twochars[2]; - - DECLARE_MBSTATE; - - istring = (char *)xmalloc (istring_size = DEFAULT_INITIAL_ARRAY_SIZE); - istring[istring_index = 0] = '\0'; - quoted_dollar_at = had_quoted_null = has_dollar_at = 0; - split_on_spaces = 0; - quoted_state = UNQUOTED; - - string = word->word; - if (string == 0) - goto finished_with_string; - /* Don't need the string length for the SADD... and COPY_ macros unless - multibyte characters are possible. */ - string_size = (MB_CUR_MAX > 1) ? strlen (string) : 1; - - if (contains_dollar_at) - *contains_dollar_at = 0; - - assignoff = -1; - - /* Begin the expansion. */ - - for (sindex = 0; ;) - { - c = string[sindex]; - - /* Case on toplevel character. */ - switch (c) - { - case '\0': - goto finished_with_string; - - case CTLESC: - sindex++; -#if HANDLE_MULTIBYTE - if (MB_CUR_MAX > 1 && string[sindex]) - { - SADD_MBQCHAR_BODY(temp, string, sindex, string_size); - } - else -#endif - { - temp = (char *)xmalloc (3); - temp[0] = CTLESC; - temp[1] = c = string[sindex]; - temp[2] = '\0'; - } - -dollar_add_string: - if (string[sindex]) - sindex++; - -add_string: - if (temp) - { - istring = sub_append_string (temp, istring, &istring_index, &istring_size); - temp = (char *)0; - } - - break; - -#if defined (PROCESS_SUBSTITUTION) - /* Process substitution. */ - case '<': - case '>': - { - if (string[++sindex] != LPAREN || (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (word->flags & (W_DQUOTE|W_NOPROCSUB)) || posixly_correct) - { - sindex--; /* add_character: label increments sindex */ - goto add_character; - } - else - t_index = sindex + 1; /* skip past both '<' and LPAREN */ - - temp1 = extract_process_subst (string, (c == '<') ? "<(" : ">(", &t_index); /*))*/ - sindex = t_index; - - /* If the process substitution specification is `<()', we want to - open the pipe for writing in the child and produce output; if - it is `>()', we want to open the pipe for reading in the child - and consume input. */ - temp = temp1 ? process_substitute (temp1, (c == '>')) : (char *)0; - - FREE (temp1); - - goto dollar_add_string; - } -#endif /* PROCESS_SUBSTITUTION */ - - case '=': - /* Posix.2 section 3.6.1 says that tildes following `=' in words - which are not assignment statements are not expanded. If the - shell isn't in posix mode, though, we perform tilde expansion - on `likely candidate' unquoted assignment statements (flags - include W_ASSIGNMENT but not W_QUOTED). A likely candidate - contains an unquoted :~ or =~. Something to think about: we - now have a flag that says to perform tilde expansion on arguments - to `assignment builtins' like declare and export that look like - assignment statements. We now do tilde expansion on such words - even in POSIX mode. */ - if (word->flags & (W_ASSIGNRHS|W_NOTILDE)) - { - if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c)) - goto add_ifs_character; - else - goto add_character; - } - /* If we're not in posix mode or forcing assignment-statement tilde - expansion, note where the `=' appears in the word and prepare to - do tilde expansion following the first `='. */ - if ((word->flags & W_ASSIGNMENT) && - (posixly_correct == 0 || (word->flags & W_TILDEEXP)) && - assignoff == -1 && sindex > 0) - assignoff = sindex; - if (sindex == assignoff && string[sindex+1] == '~') /* XXX */ - word->flags |= W_ITILDE; -#if 0 - else if ((word->flags & W_ASSIGNMENT) && - (posixly_correct == 0 || (word->flags & W_TILDEEXP)) && - string[sindex+1] == '~') - word->flags |= W_ITILDE; -#endif - if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c)) - goto add_ifs_character; - else - goto add_character; - - case ':': - if (word->flags & W_NOTILDE) - { - if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c)) - goto add_ifs_character; - else - goto add_character; - } - - if ((word->flags & (W_ASSIGNMENT|W_ASSIGNRHS|W_TILDEEXP)) && - string[sindex+1] == '~') - word->flags |= W_ITILDE; - - if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c)) - goto add_ifs_character; - else - goto add_character; - - case '~': - /* If the word isn't supposed to be tilde expanded, or we're not - at the start of a word or after an unquoted : or = in an - assignment statement, we don't do tilde expansion. */ - if ((word->flags & (W_NOTILDE|W_DQUOTE)) || - (sindex > 0 && ((word->flags & W_ITILDE) == 0)) || - (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - { - word->flags &= ~W_ITILDE; - if (isexp == 0 && (word->flags & (W_NOSPLIT|W_NOSPLIT2)) == 0 && isifs (c) && (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) == 0) - goto add_ifs_character; - else - goto add_character; - } - - if (word->flags & W_ASSIGNRHS) - tflag = 2; - else if (word->flags & (W_ASSIGNMENT|W_TILDEEXP)) - tflag = 1; - else - tflag = 0; - - temp = bash_tilde_find_word (string + sindex, tflag, &t_index); - - word->flags &= ~W_ITILDE; - - if (temp && *temp && t_index > 0) - { - temp1 = bash_tilde_expand (temp, tflag); - if (temp1 && *temp1 == '~' && STREQ (temp, temp1)) - { - FREE (temp); - FREE (temp1); - goto add_character; /* tilde expansion failed */ - } - free (temp); - temp = temp1; - sindex += t_index; - goto add_quoted_string; /* XXX was add_string */ - } - else - { - FREE (temp); - goto add_character; - } - - case '$': - if (expanded_something) - *expanded_something = 1; - - temp_has_dollar_at = 0; - pflags = (word->flags & W_NOCOMSUB) ? PF_NOCOMSUB : 0; - if (word->flags & W_NOSPLIT2) - pflags |= PF_NOSPLIT2; - if (word->flags & W_ASSIGNRHS) - pflags |= PF_ASSIGNRHS; - tword = param_expand (string, &sindex, quoted, expanded_something, - &temp_has_dollar_at, "ed_dollar_at, - &had_quoted_null, pflags); - has_dollar_at += temp_has_dollar_at; - split_on_spaces += (tword->flags & W_SPLITSPACE); - - if (tword == &expand_wdesc_error || tword == &expand_wdesc_fatal) - { - free (string); - free (istring); - return ((tword == &expand_wdesc_error) ? &expand_word_error - : &expand_word_fatal); - } - if (contains_dollar_at && has_dollar_at) - *contains_dollar_at = 1; - - if (tword && (tword->flags & W_HASQUOTEDNULL)) - had_quoted_null = 1; - - temp = tword ? tword->word : (char *)NULL; - dispose_word_desc (tword); - - /* Kill quoted nulls; we will add them back at the end of - expand_word_internal if nothing else in the string */ - if (had_quoted_null && temp && QUOTED_NULL (temp)) - { - FREE (temp); - temp = (char *)NULL; - } - - goto add_string; - break; - - case '`': /* Backquoted command substitution. */ - { - t_index = sindex++; - - temp = string_extract (string, &sindex, "`", SX_REQMATCH); - /* The test of sindex against t_index is to allow bare instances of - ` to pass through, for backwards compatibility. */ - if (temp == &extract_string_error || temp == &extract_string_fatal) - { - if (sindex - 1 == t_index) - { - sindex = t_index; - goto add_character; - } - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("bad substitution: no closing \"`\" in %s") , string+t_index); - free (string); - free (istring); - return ((temp == &extract_string_error) ? &expand_word_error - : &expand_word_fatal); - } - - if (expanded_something) - *expanded_something = 1; - - if (word->flags & W_NOCOMSUB) - /* sindex + 1 because string[sindex] == '`' */ - temp1 = substring (string, t_index, sindex + 1); - else - { - de_backslash (temp); - tword = command_substitute (temp, quoted); - temp1 = tword ? tword->word : (char *)NULL; - if (tword) - dispose_word_desc (tword); - } - FREE (temp); - temp = temp1; - goto dollar_add_string; - } - - case '\\': - if (string[sindex + 1] == '\n') - { - sindex += 2; - continue; - } - - c = string[++sindex]; - - if (quoted & Q_HERE_DOCUMENT) - tflag = CBSHDOC; - else if (quoted & Q_DOUBLE_QUOTES) - tflag = CBSDQUOTE; - else - tflag = 0; - - /* From Posix discussion on austin-group list: Backslash escaping - a } in ${...} is removed. Issue 0000221 */ - if ((quoted & Q_DOLBRACE) && c == RBRACE) - { - SCOPY_CHAR_I (twochars, CTLESC, c, string, sindex, string_size); - } - /* This is the fix for " $@\ " */ - else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && ((sh_syntaxtab[c] & tflag) == 0) & isexp == 0 && isifs (c)) - { - RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, - DEFAULT_ARRAY_SIZE); - istring[istring_index++] = CTLESC; - istring[istring_index++] = '\\'; - istring[istring_index] = '\0'; - - SCOPY_CHAR_I (twochars, CTLESC, c, string, sindex, string_size); - } - else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && ((sh_syntaxtab[c] & tflag) == 0)) - { - SCOPY_CHAR_I (twochars, '\\', c, string, sindex, string_size); - } - else if (c == 0) - { - c = CTLNUL; - sindex--; /* add_character: label increments sindex */ - goto add_character; - } - else - { - SCOPY_CHAR_I (twochars, CTLESC, c, string, sindex, string_size); - } - - sindex++; -add_twochars: - /* BEFORE jumping here, we need to increment sindex if appropriate */ - RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, - DEFAULT_ARRAY_SIZE); - istring[istring_index++] = twochars[0]; - istring[istring_index++] = twochars[1]; - istring[istring_index] = '\0'; - - break; - - case '"': - if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - goto add_character; - - t_index = ++sindex; - temp = string_extract_double_quoted (string, &sindex, 0); - - /* If the quotes surrounded the entire string, then the - whole word was quoted. */ - quoted_state = (t_index == 1 && string[sindex] == '\0') - ? WHOLLY_QUOTED - : PARTIALLY_QUOTED; - - if (temp && *temp) - { - tword = alloc_word_desc (); - tword->word = temp; - - temp = (char *)NULL; - - temp_has_dollar_at = 0; /* XXX */ - /* Need to get W_HASQUOTEDNULL flag through this function. */ - list = expand_word_internal (tword, Q_DOUBLE_QUOTES, 0, &temp_has_dollar_at, (int *)NULL); - has_dollar_at += temp_has_dollar_at; - - if (list == &expand_word_error || list == &expand_word_fatal) - { - free (istring); - free (string); - /* expand_word_internal has already freed temp_word->word - for us because of the way it prints error messages. */ - tword->word = (char *)NULL; - dispose_word (tword); - return list; - } - - dispose_word (tword); - - /* "$@" (a double-quoted dollar-at) expands into nothing, - not even a NULL word, when there are no positional - parameters. */ - if (list == 0 && has_dollar_at) - { - quoted_dollar_at++; - break; - } - - /* If we get "$@", we know we have expanded something, so we - need to remember it for the final split on $IFS. This is - a special case; it's the only case where a quoted string - can expand into more than one word. It's going to come back - from the above call to expand_word_internal as a list with - a single word, in which all characters are quoted and - separated by blanks. What we want to do is to turn it back - into a list for the next piece of code. */ - if (list) - dequote_list (list); - - if (list && list->word && (list->word->flags & W_HASQUOTEDNULL)) - had_quoted_null = 1; /* XXX */ - - if (has_dollar_at) - { - quoted_dollar_at++; - if (contains_dollar_at) - *contains_dollar_at = 1; - if (expanded_something) - *expanded_something = 1; - } - } - else - { - /* What we have is "". This is a minor optimization. */ - FREE (temp); - list = (WORD_LIST *)NULL; - } - - /* The code above *might* return a list (consider the case of "$@", - where it returns "$1", "$2", etc.). We can't throw away the - rest of the list, and we have to make sure each word gets added - as quoted. We test on tresult->next: if it is non-NULL, we - quote the whole list, save it to a string with string_list, and - add that string. We don't need to quote the results of this - (and it would be wrong, since that would quote the separators - as well), so we go directly to add_string. */ - if (list) - { - if (list->next) - { - /* Testing quoted_dollar_at makes sure that "$@" is - split correctly when $IFS does not contain a space. */ - temp = quoted_dollar_at - ? string_list_dollar_at (list, Q_DOUBLE_QUOTES) - : string_list (quote_list (list)); - dispose_words (list); - goto add_string; - } - else - { - temp = savestring (list->word->word); - tflag = list->word->flags; - dispose_words (list); - - /* If the string is not a quoted null string, we want - to remove any embedded unquoted CTLNUL characters. - We do not want to turn quoted null strings back into - the empty string, though. We do this because we - want to remove any quoted nulls from expansions that - contain other characters. For example, if we have - x"$*"y or "x$*y" and there are no positional parameters, - the $* should expand into nothing. */ - /* We use the W_HASQUOTEDNULL flag to differentiate the - cases: a quoted null character as above and when - CTLNUL is contained in the (non-null) expansion - of some variable. We use the had_quoted_null flag to - pass the value through this function to its caller. */ - if ((tflag & W_HASQUOTEDNULL) && QUOTED_NULL (temp) == 0) - remove_quoted_nulls (temp); /* XXX */ - } - } - else - temp = (char *)NULL; - - /* We do not want to add quoted nulls to strings that are only - partially quoted; we can throw them away. The exception to - this is when we are going to be performing word splitting, - since we have to preserve a null argument if the next character - will cause word splitting. */ - if (temp == 0 && quoted_state == PARTIALLY_QUOTED && (word->flags & (W_NOSPLIT|W_NOSPLIT2))) - continue; - - add_quoted_string: - - if (temp) - { - temp1 = temp; - temp = quote_string (temp); - free (temp1); - goto add_string; - } - else - { - /* Add NULL arg. */ - c = CTLNUL; - sindex--; /* add_character: label increments sindex */ - goto add_character; - } - - /* break; */ - - case '\'': - if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT))) - goto add_character; - - t_index = ++sindex; - temp = string_extract_single_quoted (string, &sindex); - - /* If the entire STRING was surrounded by single quotes, - then the string is wholly quoted. */ - quoted_state = (t_index == 1 && string[sindex] == '\0') - ? WHOLLY_QUOTED - : PARTIALLY_QUOTED; - - /* If all we had was '', it is a null expansion. */ - if (*temp == '\0') - { - free (temp); - temp = (char *)NULL; - } - else - remove_quoted_escapes (temp); /* ??? */ - - /* We do not want to add quoted nulls to strings that are only - partially quoted; such nulls are discarded. */ - if (temp == 0 && (quoted_state == PARTIALLY_QUOTED)) - continue; - - /* If we have a quoted null expansion, add a quoted NULL to istring. */ - if (temp == 0) - { - c = CTLNUL; - sindex--; /* add_character: label increments sindex */ - goto add_character; - } - else - goto add_quoted_string; - - /* break; */ - - default: - /* This is the fix for " $@ " */ - add_ifs_character: - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (isexp == 0 && isifs (c))) - { - if (string[sindex]) /* from old goto dollar_add_string */ - sindex++; - if (c == 0) - { - c = CTLNUL; - goto add_character; - } - else - { -#if HANDLE_MULTIBYTE - if (MB_CUR_MAX > 1) - sindex--; - - if (MB_CUR_MAX > 1) - { - SADD_MBQCHAR_BODY(temp, string, sindex, string_size); - } - else -#endif - { - twochars[0] = CTLESC; - twochars[1] = c; - goto add_twochars; - } - } - } - - SADD_MBCHAR (temp, string, sindex, string_size); - - add_character: - RESIZE_MALLOCED_BUFFER (istring, istring_index, 1, istring_size, - DEFAULT_ARRAY_SIZE); - istring[istring_index++] = c; - istring[istring_index] = '\0'; - - /* Next character. */ - sindex++; - } - } - -finished_with_string: - /* OK, we're ready to return. If we have a quoted string, and - quoted_dollar_at is not set, we do no splitting at all; otherwise - we split on ' '. The routines that call this will handle what to - do if nothing has been expanded. */ - - /* Partially and wholly quoted strings which expand to the empty - string are retained as an empty arguments. Unquoted strings - which expand to the empty string are discarded. The single - exception is the case of expanding "$@" when there are no - positional parameters. In that case, we discard the expansion. */ - - /* Because of how the code that handles "" and '' in partially - quoted strings works, we need to make ISTRING into a QUOTED_NULL - if we saw quoting characters, but the expansion was empty. - "" and '' are tossed away before we get to this point when - processing partially quoted strings. This makes "" and $xxx"" - equivalent when xxx is unset. We also look to see whether we - saw a quoted null from a ${} expansion and add one back if we - need to. */ - - /* If we expand to nothing and there were no single or double quotes - in the word, we throw it away. Otherwise, we return a NULL word. - The single exception is for $@ surrounded by double quotes when - there are no positional parameters. In that case, we also throw - the word away. */ - - if (*istring == '\0') - { - if (quoted_dollar_at == 0 && (had_quoted_null || quoted_state == PARTIALLY_QUOTED)) - { - istring[0] = CTLNUL; - istring[1] = '\0'; - tword = make_bare_word (istring); - tword->flags |= W_HASQUOTEDNULL; /* XXX */ - list = make_word_list (tword, (WORD_LIST *)NULL); - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - tword->flags |= W_QUOTED; - } - /* According to sh, ksh, and Posix.2, if a word expands into nothing - and a double-quoted "$@" appears anywhere in it, then the entire - word is removed. */ - else if (quoted_state == UNQUOTED || quoted_dollar_at) - list = (WORD_LIST *)NULL; -#if 0 - else - { - tword = make_bare_word (istring); - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - tword->flags |= W_QUOTED; - list = make_word_list (tword, (WORD_LIST *)NULL); - } -#else - else - list = (WORD_LIST *)NULL; -#endif - } - else if (word->flags & W_NOSPLIT) - { - tword = make_bare_word (istring); - if (word->flags & W_ASSIGNMENT) - tword->flags |= W_ASSIGNMENT; /* XXX */ - if (word->flags & W_COMPASSIGN) - tword->flags |= W_COMPASSIGN; /* XXX */ - if (word->flags & W_NOGLOB) - tword->flags |= W_NOGLOB; /* XXX */ - if (word->flags & W_NOBRACE) - tword->flags |= W_NOBRACE; /* XXX */ - if (word->flags & W_NOEXPAND) - tword->flags |= W_NOEXPAND; /* XXX */ - if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) - tword->flags |= W_QUOTED; - if (had_quoted_null && QUOTED_NULL (istring)) - tword->flags |= W_HASQUOTEDNULL; - list = make_word_list (tword, (WORD_LIST *)NULL); - } - else - { - char *ifs_chars; - - ifs_chars = (quoted_dollar_at || has_dollar_at) ? ifs_value : (char *)NULL; - - /* If we have $@, we need to split the results no matter what. If - IFS is unset or NULL, string_list_dollar_at has separated the - positional parameters with a space, so we split on space (we have - set ifs_chars to " \t\n" above if ifs is unset). If IFS is set, - string_list_dollar_at has separated the positional parameters - with the first character of $IFS, so we split on $IFS. If - SPLIT_ON_SPACES is set, we expanded $* (unquoted) with IFS either - unset or null, and we want to make sure that we split on spaces - regardless of what else has happened to IFS since the expansion. */ - if (split_on_spaces) - list = list_string (istring, " ", 1); /* XXX quoted == 1? */ - else if (has_dollar_at && ifs_chars) - list = list_string (istring, *ifs_chars ? ifs_chars : " ", 1); - else - { - tword = make_bare_word (istring); - if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (quoted_state == WHOLLY_QUOTED)) - tword->flags |= W_QUOTED; - if (word->flags & W_ASSIGNMENT) - tword->flags |= W_ASSIGNMENT; - if (word->flags & W_COMPASSIGN) - tword->flags |= W_COMPASSIGN; - if (word->flags & W_NOGLOB) - tword->flags |= W_NOGLOB; - if (word->flags & W_NOBRACE) - tword->flags |= W_NOBRACE; - if (word->flags & W_NOEXPAND) - tword->flags |= W_NOEXPAND; - if (had_quoted_null && QUOTED_NULL (istring)) - tword->flags |= W_HASQUOTEDNULL; /* XXX */ - list = make_word_list (tword, (WORD_LIST *)NULL); - } - } - - free (istring); - return (list); -} - -/* **************************************************************** */ -/* */ -/* Functions for Quote Removal */ -/* */ -/* **************************************************************** */ - -/* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the - backslash quoting rules for within double quotes or a here document. */ -char * -string_quote_removal (string, quoted) - char *string; - int quoted; -{ - size_t slen; - char *r, *result_string, *temp, *send; - int sindex, tindex, dquote; - unsigned char c; - DECLARE_MBSTATE; - - /* The result can be no longer than the original string. */ - slen = strlen (string); - send = string + slen; - - r = result_string = (char *)xmalloc (slen + 1); - - for (dquote = sindex = 0; c = string[sindex];) - { - switch (c) - { - case '\\': - c = string[++sindex]; - if (c == 0) - { - *r++ = '\\'; - break; - } - if (((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) && (sh_syntaxtab[c] & CBSDQUOTE) == 0) - *r++ = '\\'; - /* FALLTHROUGH */ - - default: - SCOPY_CHAR_M (r, string, send, sindex); - break; - - case '\'': - if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) - { - *r++ = c; - sindex++; - break; - } - tindex = sindex + 1; - temp = string_extract_single_quoted (string, &tindex); - if (temp) - { - strcpy (r, temp); - r += strlen (r); - free (temp); - } - sindex = tindex; - break; - - case '"': - dquote = 1 - dquote; - sindex++; - break; - } - } - *r = '\0'; - return (result_string); -} - -#if 0 -/* UNUSED */ -/* Perform quote removal on word WORD. This allocates and returns a new - WORD_DESC *. */ -WORD_DESC * -word_quote_removal (word, quoted) - WORD_DESC *word; - int quoted; -{ - WORD_DESC *w; - char *t; - - t = string_quote_removal (word->word, quoted); - w = alloc_word_desc (); - w->word = t ? t : savestring (""); - return (w); -} - -/* Perform quote removal on all words in LIST. If QUOTED is non-zero, - the members of the list are treated as if they are surrounded by - double quotes. Return a new list, or NULL if LIST is NULL. */ -WORD_LIST * -word_list_quote_removal (list, quoted) - WORD_LIST *list; - int quoted; -{ - WORD_LIST *result, *t, *tresult, *e; - - for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) - { - tresult = make_word_list (word_quote_removal (t->word, quoted), (WORD_LIST *)NULL); -#if 0 - result = (WORD_LIST *) list_append (result, tresult); -#else - if (result == 0) - result = e = tresult; - else - { - e->next = tresult; - while (e->next) - e = e->next; - } -#endif - } - return (result); -} -#endif - -/******************************************* - * * - * Functions to perform word splitting * - * * - *******************************************/ - -void -setifs (v) - SHELL_VAR *v; -{ - char *t; - unsigned char uc; - - ifs_var = v; - ifs_value = (v && value_cell (v)) ? value_cell (v) : " \t\n"; - - ifs_is_set = ifs_var != 0; - ifs_is_null = ifs_is_set && (*ifs_value == 0); - - /* Should really merge ifs_cmap with sh_syntaxtab. XXX - doesn't yet - handle multibyte chars in IFS */ - memset (ifs_cmap, '\0', sizeof (ifs_cmap)); - for (t = ifs_value ; t && *t; t++) - { - uc = *t; - ifs_cmap[uc] = 1; - } - -#if defined (HANDLE_MULTIBYTE) - if (ifs_value == 0) - { - ifs_firstc[0] = '\0'; - ifs_firstc_len = 1; - } - else - { - size_t ifs_len; - ifs_len = strnlen (ifs_value, MB_CUR_MAX); - ifs_firstc_len = MBLEN (ifs_value, ifs_len); - if (ifs_firstc_len == 1 || ifs_firstc_len == 0 || MB_INVALIDCH (ifs_firstc_len)) - { - ifs_firstc[0] = ifs_value[0]; - ifs_firstc[1] = '\0'; - ifs_firstc_len = 1; - } - else - memcpy (ifs_firstc, ifs_value, ifs_firstc_len); - } -#else - ifs_firstc = ifs_value ? *ifs_value : 0; -#endif -} - -char * -getifs () -{ - return ifs_value; -} - -/* This splits a single word into a WORD LIST on $IFS, but only if the word - is not quoted. list_string () performs quote removal for us, even if we - don't do any splitting. */ -WORD_LIST * -word_split (w, ifs_chars) - WORD_DESC *w; - char *ifs_chars; -{ - WORD_LIST *result; - - if (w) - { - char *xifs; - - xifs = ((w->flags & W_QUOTED) || ifs_chars == 0) ? "" : ifs_chars; - result = list_string (w->word, xifs, w->flags & W_QUOTED); - } - else - result = (WORD_LIST *)NULL; - - return (result); -} - -/* Perform word splitting on LIST and return the RESULT. It is possible - to return (WORD_LIST *)NULL. */ -static WORD_LIST * -word_list_split (list) - WORD_LIST *list; -{ - WORD_LIST *result, *t, *tresult, *e; - - for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) - { - tresult = word_split (t->word, ifs_value); - if (result == 0) - result = e = tresult; - else - { - e->next = tresult; - while (e->next) - e = e->next; - } - } - return (result); -} - -/************************************************** - * * - * Functions to expand an entire WORD_LIST * - * * - **************************************************/ - -/* Do any word-expansion-specific cleanup and jump to top_level */ -static void -exp_jump_to_top_level (v) - int v; -{ - set_pipestatus_from_exit (last_command_exit_value); - - /* Cleanup code goes here. */ - expand_no_split_dollar_star = 0; /* XXX */ - expanding_redir = 0; - assigning_in_environment = 0; - - if (parse_and_execute_level == 0) - top_level_cleanup (); /* from sig.c */ - - jump_to_top_level (v); -} - -/* Put NLIST (which is a WORD_LIST * of only one element) at the front of - ELIST, and set ELIST to the new list. */ -#define PREPEND_LIST(nlist, elist) \ - do { nlist->next = elist; elist = nlist; } while (0) - -/* Separate out any initial variable assignments from TLIST. If set -k has - been executed, remove all assignment statements from TLIST. Initial - variable assignments and other environment assignments are placed - on SUBST_ASSIGN_VARLIST. */ -static WORD_LIST * -separate_out_assignments (tlist) - WORD_LIST *tlist; -{ - register WORD_LIST *vp, *lp; - - if (tlist == 0) - return ((WORD_LIST *)NULL); - - if (subst_assign_varlist) - dispose_words (subst_assign_varlist); /* Clean up after previous error */ - - subst_assign_varlist = (WORD_LIST *)NULL; - vp = lp = tlist; - - /* Separate out variable assignments at the start of the command. - Loop invariant: vp->next == lp - Loop postcondition: - lp = list of words left after assignment statements skipped - tlist = original list of words - */ - while (lp && (lp->word->flags & W_ASSIGNMENT)) - { - vp = lp; - lp = lp->next; - } - - /* If lp != tlist, we have some initial assignment statements. - We make SUBST_ASSIGN_VARLIST point to the list of assignment - words and TLIST point to the remaining words. */ - if (lp != tlist) - { - subst_assign_varlist = tlist; - /* ASSERT(vp->next == lp); */ - vp->next = (WORD_LIST *)NULL; /* terminate variable list */ - tlist = lp; /* remainder of word list */ - } - - /* vp == end of variable list */ - /* tlist == remainder of original word list without variable assignments */ - if (!tlist) - /* All the words in tlist were assignment statements */ - return ((WORD_LIST *)NULL); - - /* ASSERT(tlist != NULL); */ - /* ASSERT((tlist->word->flags & W_ASSIGNMENT) == 0); */ - - /* If the -k option is in effect, we need to go through the remaining - words, separate out the assignment words, and place them on - SUBST_ASSIGN_VARLIST. */ - if (place_keywords_in_env) - { - WORD_LIST *tp; /* tp == running pointer into tlist */ - - tp = tlist; - lp = tlist->next; - - /* Loop Invariant: tp->next == lp */ - /* Loop postcondition: tlist == word list without assignment statements */ - while (lp) - { - if (lp->word->flags & W_ASSIGNMENT) - { - /* Found an assignment statement, add this word to end of - subst_assign_varlist (vp). */ - if (!subst_assign_varlist) - subst_assign_varlist = vp = lp; - else - { - vp->next = lp; - vp = lp; - } - - /* Remove the word pointed to by LP from TLIST. */ - tp->next = lp->next; - /* ASSERT(vp == lp); */ - lp->next = (WORD_LIST *)NULL; - lp = tp->next; - } - else - { - tp = lp; - lp = lp->next; - } - } - } - return (tlist); -} - -#define WEXP_VARASSIGN 0x001 -#define WEXP_BRACEEXP 0x002 -#define WEXP_TILDEEXP 0x004 -#define WEXP_PARAMEXP 0x008 -#define WEXP_PATHEXP 0x010 - -/* All of the expansions, including variable assignments at the start of - the list. */ -#define WEXP_ALL (WEXP_VARASSIGN|WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) - -/* All of the expansions except variable assignments at the start of - the list. */ -#define WEXP_NOVARS (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) - -/* All of the `shell expansions': brace expansion, tilde expansion, parameter - expansion, command substitution, arithmetic expansion, word splitting, and - quote removal. */ -#define WEXP_SHELLEXP (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP) - -/* Take the list of words in LIST and do the various substitutions. Return - a new list of words which is the expanded list, and without things like - variable assignments. */ - -WORD_LIST * -expand_words (list) - WORD_LIST *list; -{ - return (expand_word_list_internal (list, WEXP_ALL)); -} - -/* Same as expand_words (), but doesn't hack variable or environment - variables. */ -WORD_LIST * -expand_words_no_vars (list) - WORD_LIST *list; -{ - return (expand_word_list_internal (list, WEXP_NOVARS)); -} - -WORD_LIST * -expand_words_shellexp (list) - WORD_LIST *list; -{ - return (expand_word_list_internal (list, WEXP_SHELLEXP)); -} - -static WORD_LIST * -glob_expand_word_list (tlist, eflags) - WORD_LIST *tlist; - int eflags; -{ - char **glob_array, *temp_string; - register int glob_index; - WORD_LIST *glob_list, *output_list, *disposables, *next; - WORD_DESC *tword; - - output_list = disposables = (WORD_LIST *)NULL; - glob_array = (char **)NULL; - while (tlist) - { - /* For each word, either globbing is attempted or the word is - added to orig_list. If globbing succeeds, the results are - added to orig_list and the word (tlist) is added to the list - of disposable words. If globbing fails and failed glob - expansions are left unchanged (the shell default), the - original word is added to orig_list. If globbing fails and - failed glob expansions are removed, the original word is - added to the list of disposable words. orig_list ends up - in reverse order and requires a call to REVERSE_LIST to - be set right. After all words are examined, the disposable - words are freed. */ - next = tlist->next; - - /* If the word isn't an assignment and contains an unquoted - pattern matching character, then glob it. */ - if ((tlist->word->flags & W_NOGLOB) == 0 && - unquoted_glob_pattern_p (tlist->word->word)) - { - glob_array = shell_glob_filename (tlist->word->word); - - /* Handle error cases. - I don't think we should report errors like "No such file - or directory". However, I would like to report errors - like "Read failed". */ - - if (glob_array == 0 || GLOB_FAILED (glob_array)) - { - glob_array = (char **)xmalloc (sizeof (char *)); - glob_array[0] = (char *)NULL; - } - - /* Dequote the current word in case we have to use it. */ - if (glob_array[0] == NULL) - { - temp_string = dequote_string (tlist->word->word); - free (tlist->word->word); - tlist->word->word = temp_string; - } - - /* Make the array into a word list. */ - glob_list = (WORD_LIST *)NULL; - for (glob_index = 0; glob_array[glob_index]; glob_index++) - { - tword = make_bare_word (glob_array[glob_index]); - glob_list = make_word_list (tword, glob_list); - } - - if (glob_list) - { - output_list = (WORD_LIST *)list_append (glob_list, output_list); - PREPEND_LIST (tlist, disposables); - } - else if (fail_glob_expansion != 0) - { - last_command_exit_value = EXECUTION_FAILURE; - report_error (_("no match: %s"), tlist->word->word); - exp_jump_to_top_level (DISCARD); - } - else if (allow_null_glob_expansion == 0) - { - /* Failed glob expressions are left unchanged. */ - PREPEND_LIST (tlist, output_list); - } - else - { - /* Failed glob expressions are removed. */ - PREPEND_LIST (tlist, disposables); - } - } - else - { - /* Dequote the string. */ - temp_string = dequote_string (tlist->word->word); - free (tlist->word->word); - tlist->word->word = temp_string; - PREPEND_LIST (tlist, output_list); - } - - strvec_dispose (glob_array); - glob_array = (char **)NULL; - - tlist = next; - } - - if (disposables) - dispose_words (disposables); - - if (output_list) - output_list = REVERSE_LIST (output_list, WORD_LIST *); - - return (output_list); -} - -#if defined (BRACE_EXPANSION) -static WORD_LIST * -brace_expand_word_list (tlist, eflags) - WORD_LIST *tlist; - int eflags; -{ - register char **expansions; - char *temp_string; - WORD_LIST *disposables, *output_list, *next; - WORD_DESC *w; - int eindex; - - for (disposables = output_list = (WORD_LIST *)NULL; tlist; tlist = next) - { - next = tlist->next; - - if (tlist->word->flags & W_NOBRACE) - { -/*itrace("brace_expand_word_list: %s: W_NOBRACE", tlist->word->word);*/ - PREPEND_LIST (tlist, output_list); - continue; - } - - if ((tlist->word->flags & (W_COMPASSIGN|W_ASSIGNARG)) == (W_COMPASSIGN|W_ASSIGNARG)) - { -/*itrace("brace_expand_word_list: %s: W_COMPASSIGN|W_ASSIGNARG", tlist->word->word);*/ - PREPEND_LIST (tlist, output_list); - continue; - } - - /* Only do brace expansion if the word has a brace character. If - not, just add the word list element to BRACES and continue. In - the common case, at least when running shell scripts, this will - degenerate to a bunch of calls to `mbschr', and then what is - basically a reversal of TLIST into BRACES, which is corrected - by a call to REVERSE_LIST () on BRACES when the end of TLIST - is reached. */ - if (mbschr (tlist->word->word, LBRACE)) - { - expansions = brace_expand (tlist->word->word); - - for (eindex = 0; temp_string = expansions[eindex]; eindex++) - { - w = alloc_word_desc (); - w->word = temp_string; - - /* If brace expansion didn't change the word, preserve - the flags. We may want to preserve the flags - unconditionally someday -- XXX */ - if (STREQ (temp_string, tlist->word->word)) - w->flags = tlist->word->flags; - else - w = make_word_flags (w, temp_string); - - output_list = make_word_list (w, output_list); - } - free (expansions); - - /* Add TLIST to the list of words to be freed after brace - expansion has been performed. */ - PREPEND_LIST (tlist, disposables); - } - else - PREPEND_LIST (tlist, output_list); - } - - if (disposables) - dispose_words (disposables); - - if (output_list) - output_list = REVERSE_LIST (output_list, WORD_LIST *); - - return (output_list); -} -#endif - -#if defined (ARRAY_VARS) -/* Take WORD, a compound associative array assignment, and internally run - 'declare -A w', where W is the variable name portion of WORD. */ -static int -make_internal_declare (word, option) - char *word; - char *option; -{ - int t; - WORD_LIST *wl; - WORD_DESC *w; - - w = make_word (word); - - t = assignment (w->word, 0); - w->word[t] = '\0'; - - wl = make_word_list (w, (WORD_LIST *)NULL); - wl = make_word_list (make_word (option), wl); - - return (declare_builtin (wl)); -} -#endif - -static WORD_LIST * -shell_expand_word_list (tlist, eflags) - WORD_LIST *tlist; - int eflags; -{ - WORD_LIST *expanded, *orig_list, *new_list, *next, *temp_list; - int expanded_something, has_dollar_at; - char *temp_string; - - /* We do tilde expansion all the time. This is what 1003.2 says. */ - new_list = (WORD_LIST *)NULL; - for (orig_list = tlist; tlist; tlist = next) - { - temp_string = tlist->word->word; - - next = tlist->next; - -#if defined (ARRAY_VARS) - /* If this is a compound array assignment to a builtin that accepts - such assignments (e.g., `declare'), take the assignment and perform - it separately, handling the semantics of declarations inside shell - functions. This avoids the double-evaluation of such arguments, - because `declare' does some evaluation of compound assignments on - its own. */ - if ((tlist->word->flags & (W_COMPASSIGN|W_ASSIGNARG)) == (W_COMPASSIGN|W_ASSIGNARG)) - { - int t; - - if ((tlist->word->flags & (W_ASSIGNASSOC|W_ASSNGLOBAL)) == (W_ASSIGNASSOC|W_ASSNGLOBAL)) - make_internal_declare (tlist->word->word, "-gA"); - else if (tlist->word->flags & W_ASSIGNASSOC) - make_internal_declare (tlist->word->word, "-A"); - else if ((tlist->word->flags & (W_ASSIGNARRAY|W_ASSNGLOBAL)) == (W_ASSIGNARRAY|W_ASSNGLOBAL)) - make_internal_declare (tlist->word->word, "-ga"); - else if (tlist->word->flags & W_ASSIGNARRAY) - make_internal_declare (tlist->word->word, "-a"); - else if (tlist->word->flags & W_ASSNGLOBAL) - make_internal_declare (tlist->word->word, "-g"); - - t = do_word_assignment (tlist->word, 0); - if (t == 0) - { - last_command_exit_value = EXECUTION_FAILURE; - exp_jump_to_top_level (DISCARD); - } - - /* Now transform the word as ksh93 appears to do and go on */ - t = assignment (tlist->word->word, 0); - tlist->word->word[t] = '\0'; - tlist->word->flags &= ~(W_ASSIGNMENT|W_NOSPLIT|W_COMPASSIGN|W_ASSIGNARG|W_ASSIGNASSOC|W_ASSIGNARRAY); - } -#endif - - expanded_something = 0; - expanded = expand_word_internal - (tlist->word, 0, 0, &has_dollar_at, &expanded_something); - - if (expanded == &expand_word_error || expanded == &expand_word_fatal) - { - /* By convention, each time this error is returned, - tlist->word->word has already been freed. */ - tlist->word->word = (char *)NULL; - - /* Dispose our copy of the original list. */ - dispose_words (orig_list); - /* Dispose the new list we're building. */ - dispose_words (new_list); - - last_command_exit_value = EXECUTION_FAILURE; - if (expanded == &expand_word_error) - exp_jump_to_top_level (DISCARD); - else - exp_jump_to_top_level (FORCE_EOF); - } - - /* Don't split words marked W_NOSPLIT. */ - if (expanded_something && (tlist->word->flags & W_NOSPLIT) == 0) - { - temp_list = word_list_split (expanded); - dispose_words (expanded); - } - else - { - /* If no parameter expansion, command substitution, process - substitution, or arithmetic substitution took place, then - do not do word splitting. We still have to remove quoted - null characters from the result. */ - word_list_remove_quoted_nulls (expanded); - temp_list = expanded; - } - - expanded = REVERSE_LIST (temp_list, WORD_LIST *); - new_list = (WORD_LIST *)list_append (expanded, new_list); - } - - if (orig_list) - dispose_words (orig_list); - - if (new_list) - new_list = REVERSE_LIST (new_list, WORD_LIST *); - - return (new_list); -} - -/* The workhorse for expand_words () and expand_words_no_vars (). - First arg is LIST, a WORD_LIST of words. - Second arg EFLAGS is a flags word controlling which expansions are - performed. - - This does all of the substitutions: brace expansion, tilde expansion, - parameter expansion, command substitution, arithmetic expansion, - process substitution, word splitting, and pathname expansion, according - to the bits set in EFLAGS. Words with the W_QUOTED or W_NOSPLIT bits - set, or for which no expansion is done, do not undergo word splitting. - Words with the W_NOGLOB bit set do not undergo pathname expansion; words - with W_NOBRACE set do not undergo brace expansion (see - brace_expand_word_list above). */ -static WORD_LIST * -expand_word_list_internal (list, eflags) - WORD_LIST *list; - int eflags; -{ - WORD_LIST *new_list, *temp_list; - int tint; - - tempenv_assign_error = 0; - if (list == 0) - return ((WORD_LIST *)NULL); - - garglist = new_list = copy_word_list (list); - if (eflags & WEXP_VARASSIGN) - { - garglist = new_list = separate_out_assignments (new_list); - if (new_list == 0) - { - if (subst_assign_varlist) - { - /* All the words were variable assignments, so they are placed - into the shell's environment. */ - for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next) - { - this_command_name = (char *)NULL; /* no arithmetic errors */ - tint = do_word_assignment (temp_list->word, 0); - /* Variable assignment errors in non-interactive shells - running in Posix.2 mode cause the shell to exit. */ - if (tint == 0) - { - last_command_exit_value = EXECUTION_FAILURE; - if (interactive_shell == 0 && posixly_correct) - exp_jump_to_top_level (FORCE_EOF); - else - exp_jump_to_top_level (DISCARD); - } - } - dispose_words (subst_assign_varlist); - subst_assign_varlist = (WORD_LIST *)NULL; - } - return ((WORD_LIST *)NULL); - } - } - - /* Begin expanding the words that remain. The expansions take place on - things that aren't really variable assignments. */ - -#if defined (BRACE_EXPANSION) - /* Do brace expansion on this word if there are any brace characters - in the string. */ - if ((eflags & WEXP_BRACEEXP) && brace_expansion && new_list) - new_list = brace_expand_word_list (new_list, eflags); -#endif /* BRACE_EXPANSION */ - - /* Perform the `normal' shell expansions: tilde expansion, parameter and - variable substitution, command substitution, arithmetic expansion, - and word splitting. */ - new_list = shell_expand_word_list (new_list, eflags); - - /* Okay, we're almost done. Now let's just do some filename - globbing. */ - if (new_list) - { - if ((eflags & WEXP_PATHEXP) && disallow_filename_globbing == 0) - /* Glob expand the word list unless globbing has been disabled. */ - new_list = glob_expand_word_list (new_list, eflags); - else - /* Dequote the words, because we're not performing globbing. */ - new_list = dequote_list (new_list); - } - - if ((eflags & WEXP_VARASSIGN) && subst_assign_varlist) - { - sh_wassign_func_t *assign_func; - int is_special_builtin, is_builtin_or_func; - - /* If the remainder of the words expand to nothing, Posix.2 requires - that the variable and environment assignments affect the shell's - environment. */ - assign_func = new_list ? assign_in_env : do_word_assignment; - tempenv_assign_error = 0; - - is_builtin_or_func = (new_list && new_list->word && (find_shell_builtin (new_list->word->word) || find_function (new_list->word->word))); - /* Posix says that special builtins exit if a variable assignment error - occurs in an assignment preceding it. */ - is_special_builtin = (posixly_correct && new_list && new_list->word && find_special_builtin (new_list->word->word)); - - for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next) - { - this_command_name = (char *)NULL; - assigning_in_environment = (assign_func == assign_in_env); - tint = (*assign_func) (temp_list->word, is_builtin_or_func); - assigning_in_environment = 0; - /* Variable assignment errors in non-interactive shells running - in Posix.2 mode cause the shell to exit. */ - if (tint == 0) - { - if (assign_func == do_word_assignment) - { - last_command_exit_value = EXECUTION_FAILURE; - if (interactive_shell == 0 && posixly_correct && is_special_builtin) - exp_jump_to_top_level (FORCE_EOF); - else - exp_jump_to_top_level (DISCARD); - } - else - tempenv_assign_error++; - } - } - - dispose_words (subst_assign_varlist); - subst_assign_varlist = (WORD_LIST *)NULL; - } - - return (new_list); -} |