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db873f322b
1999-06-07 Ulrich Drepper <drepper@cygnus.com> * grp/fgetgrent.c (fgetgrent): Remember position of stream before reading and reset in case the buffer was too small. * grp/fgetgrent_r.c (__fgetgrent_r): Set errno to ENOENT in case of EOF.
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/* Copyright (C) 1991, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <ctype.h>
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#include <errno.h>
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#include <grp.h>
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#include <stdio.h>
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#ifdef USE_IN_LIBIO
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# include <libio/iolibio.h>
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# define flockfile(s) _IO_flockfile (s)
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# define funlockfile(s) _IO_funlockfile (s)
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#endif
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/* Define a line parsing function using the common code
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used in the nss_files module. */
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#define STRUCTURE group
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#define ENTNAME grent
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struct grent_data {};
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#define TRAILING_LIST_MEMBER gr_mem
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#define TRAILING_LIST_SEPARATOR_P(c) ((c) == ',')
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#include <nss/nss_files/files-parse.c>
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LINE_PARSER
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(,
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STRING_FIELD (result->gr_name, ISCOLON, 0);
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if (line[0] == '\0'
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&& (result->gr_name[0] == '+' || result->gr_name[0] == '-'))
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{
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result->gr_passwd = NULL;
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result->gr_gid = 0;
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}
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else
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{
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STRING_FIELD (result->gr_passwd, ISCOLON, 0);
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if (result->gr_name[0] == '+' || result->gr_name[0] == '-')
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INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)
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else
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INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)
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}
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)
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/* Read one entry from the given stream. */
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int
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__fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
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struct group **result)
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{
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char *p;
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int parse_result;
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flockfile (stream);
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do
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{
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buffer[buflen - 1] = '\xff';
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p = fgets_unlocked (buffer, buflen, stream);
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if (p == NULL && feof_unlocked (stream))
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{
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funlockfile (stream);
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*result = NULL;
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__set_errno (ENOENT);
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return errno;
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}
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if (p == NULL || buffer[buflen - 1] != '\xff')
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{
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funlockfile (stream);
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*result = NULL;
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__set_errno (ERANGE);
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return errno;
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}
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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} while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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|| ! (parse_result = parse_line (p, resbuf,
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(void *) buffer, buflen,
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&errno)));
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funlockfile (stream);
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if (parse_result == -1)
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{
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/* The parser ran out of space. */
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*result = NULL;
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return errno;
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}
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*result = resbuf;
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return 0;
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}
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weak_alias (__fgetgrent_r, fgetgrent_r)
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