grp/fgetgrent_r.c

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <ctype.h>
  19 #include <errno.h>
  20 #include <grp.h>
  21 #include <stdio.h>
  22
  23 /* Define a line parsing function using the common code
  24    used in the nss_files module.  */
  25
  26 #define STRUCTURE       group
  27 #define ENTNAME         grent
  28 struct grent_data {};
  29
  30 #define TRAILING_LIST_MEMBER            gr_mem
  31 #define TRAILING_LIST_SEPARATOR_P(c)    ((c) == ',')
  32 #include <nss/nss_files/files-parse.c>
  33 LINE_PARSER
  34 (,
  35  STRING_FIELD (result->gr_name, ISCOLON, 0);
  36  if (line[0] == '\0'
  37      && (result->gr_name[0] == '+' || result->gr_name[0] == '-'))
  38    {
  39      result->gr_passwd = NULL;
  40      result->gr_gid = 0;
  41    }
  42  else
  43    {
  44      STRING_FIELD (result->gr_passwd, ISCOLON, 0);
  45      if (result->gr_name[0] == '+' || result->gr_name[0] == '-')
  46        INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)
  47      else
  48        INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)
  49    }
  50  )
  51
  52
  53 /* Read one entry from the given stream.  */
  54 int
  55 __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
  56                struct group **result)
  57 {
  58   int ret = __nss_fgetent_r (stream, resbuf, buffer, buflen, parse_line);
  59   if (ret == 0)
  60     *result = resbuf;
  61   else
  62     *result = NULL;
  63   return ret;
  64 }
  65 weak_alias (__fgetgrent_r, fgetgrent_r)