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/* Common code for file-based database parsers in nss_files module.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
/* These symbols are defined by the including source file:
ENTNAME -- database name of the structure and functions (hostent, pwent).
STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
DATABASE -- string of the database file's name ("hosts", "passwd").
ENTDATA -- if defined, `struct ENTDATA' is used by the parser to store
things pointed to by the resultant `struct STRUCTURE'.
NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
Also see files-XXX.c. */
#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b
#ifndef STRUCTURE
#define STRUCTURE ENTNAME
#endif
struct parser_data
{
#ifdef ENTDATA
struct ENTDATA entdata;
#define ENTDATA_DECL(data) struct ENTDATA *const entdata = &data->entdata;
#else
#define ENTDATA_DECL(data)
#endif
char linebuffer[0];
};
#ifdef ENTDATA
/* The function can't be exported, because the entdata structure
is defined only in files-foo.c. */
#define parser_stclass static inline
#else
/* Export the line parser function so it can be used in nss_db. */
#define parser_stclass /* Global */
#define parse_line CONCAT(_nss_files_parse_,ENTNAME)
#endif
#ifdef EXTERN_PARSER
/* The parser is defined in a different module. */
extern int parse_line (char *line, struct STRUCTURE *result,
struct parser_data *data, int datalen);
#define LINE_PARSER(EOLSET, BODY) /* Do nothing */
#else
/* Define a line parsing function. */
#define LINE_PARSER(EOLSET, BODY) \
parser_stclass int \
parse_line (char *line, struct STRUCTURE *result, \
struct parser_data *data, int datalen) \
{ \
ENTDATA_DECL (data) \
char *p = strpbrk (line, EOLSET "\n"); \
if (p) \
*p = '\0'; \
BODY; \
TRAILING_LIST_PARSER; \
return 1; \
}
#define STRING_FIELD(variable, terminator_p, swallow) \
{ \
variable = line; \
while (*line != '\0' && !terminator_p (*line)) \
++line; \
if (*line != '\0') \
{ \
*line = '\0'; \
do \
++line; \
while (swallow && terminator_p (*line)); \
} \
}
#define INT_FIELD(variable, terminator_p, swallow, base, convert) \
{ \
char *endp; \
variable = convert (strtol (line, &endp, base)); \
if (endp == line) \
return 0; \
else if (terminator_p (*endp)) \
do \
++endp; \
while (swallow && terminator_p (*endp)); \
else if (*endp != '\0') \
return 0; \
line = endp; \
}
#define INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \
{ \
char *endp; \
if (*line == '\0') \
/* We expect some more input, so don't allow the string to end here. */ \
return 0; \
variable = convert (strtol (line, &endp, base)); \
if (endp == line) \
variable = default; \
if (terminator_p (*endp)) \
do \
++endp; \
while (swallow && terminator_p (*endp)); \
else if (*endp != '\0') \
return 0; \
line = endp; \
}
#define ISCOLON(c) ((c) == ':')
#ifndef TRAILING_LIST_MEMBER
#define TRAILING_LIST_PARSER /* Nothing to do. */
#else
#define TRAILING_LIST_PARSER \
{ \
char **list = parse_list (line, data, datalen); \
if (list) \
result->TRAILING_LIST_MEMBER = list; \
else \
return 0; \
}
static inline char **
parse_list (char *line, struct parser_data *data, int datalen)
{
char *eol, **list, **p;
if (line >= data->linebuffer && line < (char *) data + datalen)
/* Find the end of the line buffer, we will use the space in DATA after
it for storing the vector of pointers. */
eol = strchr (line, '\0') + 1;
else
/* LINE does not point within DATA->linebuffer, so that space is
not being used for scratch space right now. We can use all of
it for the pointer vector storage. */
eol = data->linebuffer;
/* Adjust the pointer so it is aligned for storing pointers. */
eol += __alignof__ (char *) - 1;
eol -= (eol - (char *) 0) % __alignof__ (char *);
/* We will start the storage here for the vector of pointers. */
list = (char **) eol;
p = list;
while (1)
{
char *elt;
if ((char *) &p[1] - (char *) data > datalen)
{
/* We cannot fit another pointer in the buffer. */
__set_errno (ERANGE);
return NULL;
}
if (*line == '\0')
break;
elt = line;
while (1)
{
if (TRAILING_LIST_SEPARATOR_P (*line))
{
*p++ = elt;
*line = '\0';
do
++line;
while (TRAILING_LIST_SEPARATOR_P (*line));
elt = line;
}
else if (*line == '\0' || *line == '\n')
{
/* End of the line. */
if (line > elt)
/* Last element. */
*p++ = elt;
*line = '\0';
break;
}
else
++line;
}
}
*p = NULL;
return list;
}
#endif /* TRAILING_LIST_MEMBER */
#endif /* EXTERN_PARSER */
#define LOOKUP_NAME(nameelt, aliaselt) \
{ \
char **ap; \
if (! strcmp (name, result->nameelt)) \
break; \
for (ap = result->aliaselt; *ap; ++ap) \
if (! strcmp (name, *ap)) \
break; \
if (*ap) \
break; \
}
/* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */
#ifndef GENERIC
#define GENERIC "files-XXX.c"
#endif
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