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Diffstat (limited to 'src/read.c')
| -rw-r--r-- | src/read.c | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/src/read.c b/src/read.c new file mode 100644 index 0000000..df6ac20 --- /dev/null +++ b/src/read.c @@ -0,0 +1,735 @@ +/* $NetBSD: read.c,v 1.70 2013/05/27 23:55:55 christos Exp $ */ + +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Christos Zoulas of Cornell University. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "config.h" +#if !defined(lint) && !defined(SCCSID) +#if 0 +static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93"; +#else +__RCSID("$NetBSD: read.c,v 1.70 2013/05/27 23:55:55 christos Exp $"); +#endif +#endif /* not lint && not SCCSID */ + +/* + * read.c: Clean this junk up! This is horrible code. + * Terminal read functions + */ +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include <limits.h> +#include "el.h" + +#define OKCMD -1 /* must be -1! */ + +private int read__fixio(int, int); +private int read_preread(EditLine *); +private int read_char(EditLine *, Char *); +private int read_getcmd(EditLine *, el_action_t *, Char *); +private void read_pop(c_macro_t *); + +/* read_init(): + * Initialize the read stuff + */ +protected int +read_init(EditLine *el) +{ + /* builtin read_char */ + el->el_read.read_char = read_char; + return 0; +} + + +/* el_read_setfn(): + * Set the read char function to the one provided. + * If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one. + */ +protected int +el_read_setfn(EditLine *el, el_rfunc_t rc) +{ + el->el_read.read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc; + return 0; +} + + +/* el_read_getfn(): + * return the current read char function, or EL_BUILTIN_GETCFN + * if it is the default one + */ +protected el_rfunc_t +el_read_getfn(EditLine *el) +{ + return el->el_read.read_char == read_char ? + EL_BUILTIN_GETCFN : el->el_read.read_char; +} + + +#ifndef MIN +#define MIN(A,B) ((A) < (B) ? (A) : (B)) +#endif + +#ifdef DEBUG_EDIT +private void +read_debug(EditLine *el) +{ + + if (el->el_line.cursor > el->el_line.lastchar) + (void) fprintf(el->el_errfile, "cursor > lastchar\r\n"); + if (el->el_line.cursor < el->el_line.buffer) + (void) fprintf(el->el_errfile, "cursor < buffer\r\n"); + if (el->el_line.cursor > el->el_line.limit) + (void) fprintf(el->el_errfile, "cursor > limit\r\n"); + if (el->el_line.lastchar > el->el_line.limit) + (void) fprintf(el->el_errfile, "lastchar > limit\r\n"); + if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2]) + (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n"); +} +#endif /* DEBUG_EDIT */ + + +/* read__fixio(): + * Try to recover from a read error + */ +/* ARGSUSED */ +private int +read__fixio(int fd __attribute__((__unused__)), int e) +{ + + switch (e) { + case -1: /* Make sure that the code is reachable */ + +#ifdef EWOULDBLOCK + case EWOULDBLOCK: +#ifndef TRY_AGAIN +#define TRY_AGAIN +#endif +#endif /* EWOULDBLOCK */ + +#if defined(POSIX) && defined(EAGAIN) +#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN + case EAGAIN: +#ifndef TRY_AGAIN +#define TRY_AGAIN +#endif +#endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */ +#endif /* POSIX && EAGAIN */ + + e = 0; +#ifdef TRY_AGAIN +#if defined(F_SETFL) && defined(O_NDELAY) + if ((e = fcntl(fd, F_GETFL, 0)) == -1) + return -1; + + if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1) + return -1; + else + e = 1; +#endif /* F_SETFL && O_NDELAY */ + +#ifdef FIONBIO + { + int zero = 0; + + if (ioctl(fd, FIONBIO, &zero) == -1) + return -1; + else + e = 1; + } +#endif /* FIONBIO */ + +#endif /* TRY_AGAIN */ + return e ? 0 : -1; + + case EINTR: + return 0; + + default: + return -1; + } +} + + +/* read_preread(): + * Try to read the stuff in the input queue; + */ +private int +read_preread(EditLine *el) +{ + int chrs = 0; + + if (el->el_tty.t_mode == ED_IO) + return 0; + +#ifndef WIDECHAR +/* FIONREAD attempts to buffer up multiple bytes, and to make that work + * properly with partial wide/UTF-8 characters would need some careful work. */ +#ifdef FIONREAD + (void) ioctl(el->el_infd, FIONREAD, &chrs); + if (chrs > 0) { + char buf[EL_BUFSIZ]; + + chrs = read(el->el_infd, buf, + (size_t) MIN(chrs, EL_BUFSIZ - 1)); + if (chrs > 0) { + buf[chrs] = '\0'; + el_push(el, buf); + } + } +#endif /* FIONREAD */ +#endif + return chrs > 0; +} + + +/* el_push(): + * Push a macro + */ +public void +FUN(el,push)(EditLine *el, const Char *str) +{ + c_macro_t *ma = &el->el_chared.c_macro; + + if (str != NULL && ma->level + 1 < EL_MAXMACRO) { + ma->level++; + if ((ma->macro[ma->level] = Strdup(str)) != NULL) + return; + ma->level--; + } + terminal_beep(el); + terminal__flush(el); +} + + +/* read_getcmd(): + * Get next command from the input stream, return OKCMD on success. + * Character values > 255 are not looked up in the map, but inserted. + */ +private int +read_getcmd(EditLine *el, el_action_t *cmdnum, Char *ch) +{ + el_action_t cmd; + int num; + + el->el_errno = 0; + do { + if ((num = FUN(el,getc)(el, ch)) != 1) {/* if EOF or error */ + el->el_errno = num == 0 ? 0 : errno; + return 0; /* not OKCMD */ + } + +#ifdef KANJI + if ((*ch & 0200)) { + el->el_state.metanext = 0; + cmd = CcViMap[' ']; + break; + } else +#endif /* KANJI */ + + if (el->el_state.metanext) { + el->el_state.metanext = 0; + *ch |= 0200; + } +#ifdef WIDECHAR + if (*ch >= N_KEYS) + cmd = ED_INSERT; + else +#endif + cmd = el->el_map.current[(unsigned char) *ch]; + if (cmd == ED_SEQUENCE_LEAD_IN) { + keymacro_value_t val; + switch (keymacro_get(el, ch, &val)) { + case XK_CMD: + cmd = val.cmd; + break; + case XK_STR: + FUN(el,push)(el, val.str); + break; +#ifdef notyet + case XK_EXE: + /* XXX: In the future to run a user function */ + RunCommand(val.str); + break; +#endif + default: + EL_ABORT((el->el_errfile, "Bad XK_ type \n")); + break; + } + } + if (el->el_map.alt == NULL) + el->el_map.current = el->el_map.key; + } while (cmd == ED_SEQUENCE_LEAD_IN); + *cmdnum = cmd; + return OKCMD; +} + +#ifdef WIDECHAR +/* utf8_islead(): + * Test whether a byte is a leading byte of a UTF-8 sequence. + */ +private int +utf8_islead(int c) +{ + return c < 0x80 || /* single byte char */ + (c >= 0xc2 && c <= 0xf4); /* start of multibyte sequence */ +} +#endif + +/* read_char(): + * Read a character from the tty. + */ +private int +read_char(EditLine *el, Char *cp) +{ + ssize_t num_read; + int tried = 0; + char cbuf[MB_LEN_MAX]; + size_t cbp = 0; + int bytes = 0; + + again: + el->el_signal->sig_no = 0; + while ((num_read = read(el->el_infd, cbuf + cbp, (size_t)1)) == -1) { + int e = errno; + switch (el->el_signal->sig_no) { + case SIGCONT: + FUN(el,set)(el, EL_REFRESH); + /*FALLTHROUGH*/ + case SIGWINCH: + sig_set(el); + goto again; + default: + break; + } + if (!tried && read__fixio(el->el_infd, e) == 0) + tried = 1; + else { + errno = e; + *cp = '\0'; + return -1; + } + } + + /* Test for EOF */ + if (num_read == 0) { + errno = 0; + *cp = '\0'; + return 0; + } + +#ifdef WIDECHAR + if (el->el_flags & CHARSET_IS_UTF8) { + if (!utf8_islead((unsigned char)cbuf[0])) + goto again; /* discard the byte we read and try again */ + ++cbp; + if ((bytes = ct_mbtowc(cp, cbuf, cbp)) == -1) { + ct_mbtowc_reset; + if (cbp >= MB_LEN_MAX) { /* "shouldn't happen" */ + errno = EILSEQ; + *cp = '\0'; + return -1; + } + goto again; + } + } else if (isascii((unsigned char)cbuf[0]) || + /* we don't support other multibyte charsets */ + ++cbp != 1 || + /* Try non-ASCII characters in a 8-bit character set */ + (bytes = ct_mbtowc(cp, cbuf, cbp)) != 1) +#endif + *cp = (unsigned char)cbuf[0]; + + if ((el->el_flags & IGNORE_EXTCHARS) && bytes > 1) { + cbp = 0; /* skip this character */ + goto again; + } + + return (int)num_read; +} + +/* read_pop(): + * Pop a macro from the stack + */ +private void +read_pop(c_macro_t *ma) +{ + int i; + + el_free(ma->macro[0]); + for (i = 0; i < ma->level; i++) + ma->macro[i] = ma->macro[i + 1]; + ma->level--; + ma->offset = 0; +} + +/* el_getc(): + * Read a character + */ +public int +FUN(el,getc)(EditLine *el, Char *cp) +{ + int num_read; + c_macro_t *ma = &el->el_chared.c_macro; + + terminal__flush(el); + for (;;) { + if (ma->level < 0) { + if (!read_preread(el)) + break; + } + + if (ma->level < 0) + break; + + if (ma->macro[0][ma->offset] == '\0') { + read_pop(ma); + continue; + } + + *cp = ma->macro[0][ma->offset++]; + + if (ma->macro[0][ma->offset] == '\0') { + /* Needed for QuoteMode On */ + read_pop(ma); + } + + return 1; + } + +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, "Turning raw mode on\n"); +#endif /* DEBUG_READ */ + if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */ + return 0; + +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, "Reading a character\n"); +#endif /* DEBUG_READ */ + num_read = (*el->el_read.read_char)(el, cp); + if (num_read < 0) + el->el_errno = errno; +#ifdef WIDECHAR + if (el->el_flags & NARROW_READ) + *cp = *(char *)(void *)cp; +#endif +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, "Got it %c\n", *cp); +#endif /* DEBUG_READ */ + return num_read; +} + +protected void +read_prepare(EditLine *el) +{ + if (el->el_flags & HANDLE_SIGNALS) + sig_set(el); + if (el->el_flags & NO_TTY) + return; + if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED) + tty_rawmode(el); + + /* This is relatively cheap, and things go terribly wrong if + we have the wrong size. */ + el_resize(el); + re_clear_display(el); /* reset the display stuff */ + ch_reset(el, 0); + re_refresh(el); /* print the prompt */ + + if (el->el_flags & UNBUFFERED) + terminal__flush(el); +} + +protected void +read_finish(EditLine *el) +{ + if ((el->el_flags & UNBUFFERED) == 0) + (void) tty_cookedmode(el); + if (el->el_flags & HANDLE_SIGNALS) + sig_clr(el); +} + +public const Char * +FUN(el,gets)(EditLine *el, int *nread) +{ + int retval; + el_action_t cmdnum = 0; + int num; /* how many chars we have read at NL */ + Char ch, *cp; + int crlf = 0; + int nrb; +#ifdef FIONREAD + c_macro_t *ma = &el->el_chared.c_macro; +#endif /* FIONREAD */ + + if (nread == NULL) + nread = &nrb; + *nread = 0; + + if (el->el_flags & NO_TTY) { + size_t idx; + + cp = el->el_line.buffer; + while ((num = (*el->el_read.read_char)(el, cp)) == 1) { + /* make sure there is space for next character */ + if (cp + 1 >= el->el_line.limit) { + idx = (size_t)(cp - el->el_line.buffer); + if (!ch_enlargebufs(el, (size_t)2)) + break; + cp = &el->el_line.buffer[idx]; + } + cp++; + if (el->el_flags & UNBUFFERED) + break; + if (cp[-1] == '\r' || cp[-1] == '\n') + break; + } + if (num == -1) { + if (errno == EINTR) + cp = el->el_line.buffer; + el->el_errno = errno; + } + + goto noedit; + } + + +#ifdef FIONREAD + if (el->el_tty.t_mode == EX_IO && ma->level < 0) { + long chrs = 0; + + (void) ioctl(el->el_infd, FIONREAD, &chrs); + if (chrs == 0) { + if (tty_rawmode(el) < 0) { + errno = 0; + *nread = 0; + return NULL; + } + } + } +#endif /* FIONREAD */ + + if ((el->el_flags & UNBUFFERED) == 0) + read_prepare(el); + + if (el->el_flags & EDIT_DISABLED) { + size_t idx; + + if ((el->el_flags & UNBUFFERED) == 0) + cp = el->el_line.buffer; + else + cp = el->el_line.lastchar; + + terminal__flush(el); + + while ((num = (*el->el_read.read_char)(el, cp)) == 1) { + /* make sure there is space next character */ + if (cp + 1 >= el->el_line.limit) { + idx = (size_t)(cp - el->el_line.buffer); + if (!ch_enlargebufs(el, (size_t)2)) + break; + cp = &el->el_line.buffer[idx]; + } + cp++; + crlf = cp[-1] == '\r' || cp[-1] == '\n'; + if (el->el_flags & UNBUFFERED) + break; + if (crlf) + break; + } + + if (num == -1) { + if (errno == EINTR) + cp = el->el_line.buffer; + el->el_errno = errno; + } + + goto noedit; + } + + for (num = OKCMD; num == OKCMD;) { /* while still editing this + * line */ +#ifdef DEBUG_EDIT + read_debug(el); +#endif /* DEBUG_EDIT */ + /* if EOF or error */ + if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) { + num = -1; +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, + "Returning from el_gets %d\n", num); +#endif /* DEBUG_READ */ + break; + } + if (el->el_errno == EINTR) { + el->el_line.buffer[0] = '\0'; + el->el_line.lastchar = + el->el_line.cursor = el->el_line.buffer; + break; + } + if ((unsigned int)cmdnum >= (unsigned int)el->el_map.nfunc) { /* BUG CHECK command */ +#ifdef DEBUG_EDIT + (void) fprintf(el->el_errfile, + "ERROR: illegal command from key 0%o\r\n", ch); +#endif /* DEBUG_EDIT */ + continue; /* try again */ + } + /* now do the real command */ +#ifdef DEBUG_READ + { + el_bindings_t *b; + for (b = el->el_map.help; b->name; b++) + if (b->func == cmdnum) + break; + if (b->name) + (void) fprintf(el->el_errfile, + "Executing %s\n", b->name); + else + (void) fprintf(el->el_errfile, + "Error command = %d\n", cmdnum); + } +#endif /* DEBUG_READ */ + /* vi redo needs these way down the levels... */ + el->el_state.thiscmd = cmdnum; + el->el_state.thisch = ch; + if (el->el_map.type == MAP_VI && + el->el_map.current == el->el_map.key && + el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) { + if (cmdnum == VI_DELETE_PREV_CHAR && + el->el_chared.c_redo.pos != el->el_chared.c_redo.buf + && Isprint(el->el_chared.c_redo.pos[-1])) + el->el_chared.c_redo.pos--; + else + *el->el_chared.c_redo.pos++ = ch; + } + retval = (*el->el_map.func[cmdnum]) (el, ch); +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, + "Returned state %d\n", retval ); +#endif /* DEBUG_READ */ + + /* save the last command here */ + el->el_state.lastcmd = cmdnum; + + /* use any return value */ + switch (retval) { + case CC_CURSOR: + re_refresh_cursor(el); + break; + + case CC_REDISPLAY: + re_clear_lines(el); + re_clear_display(el); + /* FALLTHROUGH */ + + case CC_REFRESH: + re_refresh(el); + break; + + case CC_REFRESH_BEEP: + re_refresh(el); + terminal_beep(el); + break; + + case CC_NORM: /* normal char */ + break; + + case CC_ARGHACK: /* Suggested by Rich Salz */ + /* <rsalz@pineapple.bbn.com> */ + continue; /* keep going... */ + + case CC_EOF: /* end of file typed */ + if ((el->el_flags & UNBUFFERED) == 0) + num = 0; + else if (num == -1) { + *el->el_line.lastchar++ = CONTROL('d'); + el->el_line.cursor = el->el_line.lastchar; + num = 1; + } + break; + + case CC_NEWLINE: /* normal end of line */ + num = (int)(el->el_line.lastchar - el->el_line.buffer); + break; + + case CC_FATAL: /* fatal error, reset to known state */ +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, + "*** editor fatal ERROR ***\r\n\n"); +#endif /* DEBUG_READ */ + /* put (real) cursor in a known place */ + re_clear_display(el); /* reset the display stuff */ + ch_reset(el, 1); /* reset the input pointers */ + re_refresh(el); /* print the prompt again */ + break; + + case CC_ERROR: + default: /* functions we don't know about */ +#ifdef DEBUG_READ + (void) fprintf(el->el_errfile, + "*** editor ERROR ***\r\n\n"); +#endif /* DEBUG_READ */ + terminal_beep(el); + terminal__flush(el); + break; + } + el->el_state.argument = 1; + el->el_state.doingarg = 0; + el->el_chared.c_vcmd.action = NOP; + if (el->el_flags & UNBUFFERED) + break; + } + + terminal__flush(el); /* flush any buffered output */ + /* make sure the tty is set up correctly */ + if ((el->el_flags & UNBUFFERED) == 0) { + read_finish(el); + *nread = num != -1 ? num : 0; + } else { + *nread = (int)(el->el_line.lastchar - el->el_line.buffer); + } + goto done; +noedit: + el->el_line.cursor = el->el_line.lastchar = cp; + *cp = '\0'; + *nread = (int)(el->el_line.cursor - el->el_line.buffer); +done: + if (*nread == 0) { + if (num == -1) { + *nread = -1; + errno = el->el_errno; + } + return NULL; + } else + return el->el_line.buffer; +} |