grp/fgetgrent_r.c

   1 /* Copyright (C) 1991, 1996, 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <ctype.h>
  20 #include <errno.h>
  21 #include <grp.h>
  22 #include <stdio.h>
  23
  24 /* Define a line parsing function using the common code
  25    used in the nss_files module.  */
  26
  27 #define STRUCTURE       group
  28 #define ENTNAME         grent
  29 struct grent_data {};
  30
  31 #define TRAILING_LIST_MEMBER            gr_mem
  32 #define TRAILING_LIST_SEPARATOR_P(c)    ((c) == ',')
  33 #include <nss/nss_files/files-parse.c>
  34 LINE_PARSER
  35 (,
  36  STRING_FIELD (result->gr_name, ISCOLON, 0);
  37  if (line[0] == '\0'
  38      && (result->gr_name[0] == '+' || result->gr_name[0] == '-'))
  39    {
  40      result->gr_passwd = NULL;
  41      result->gr_gid = 0;
  42    }
  43  else
  44    {
  45      STRING_FIELD (result->gr_passwd, ISCOLON, 0);
  46      if (result->gr_name[0] == '+' || result->gr_name[0] == '-')
  47        INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)
  48      else
  49        INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)
  50    }
  51  )
  52
  53
  54 /* Read one entry from the given stream.  */
  55 int
  56 __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
  57                struct group **result)
  58 {
  59   char *p;
  60   int parse_result;
  61
  62   do
  63     {
  64       p = fgets (buffer, buflen, stream);
  65       if (p == NULL)
  66         {
  67           *result = NULL;
  68           return errno;
  69         }
  70
  71       /* Skip leading blanks.  */
  72       while (isspace (*p))
  73         ++p;
  74     } while (*p == '\0' || *p == '#'    /* Ignore empty and comment lines.  */
  75              /* Parse the line.  If it is invalid, loop to
  76                 get the next line of the file to parse.  */
  77              || ! (parse_result = parse_line (p, resbuf,
  78                                               (void *) buffer, buflen,
  79                                               __errno_location ())));
  80
  81   if (parse_result == -1)
  82     {
  83       /* The parser ran out of space.  */
  84       *result = NULL;
  85       return errno;
  86     }
  87
  88   *result = resbuf;
  89   return 0;
  90 }
  91 weak_alias (__fgetgrent_r, fgetgrent_r)