grp/fgetgrent.c

   1 /* Copyright (C) 1991, 1996 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdio.h>
  20 #include <grp.h>
  21
  22 /* Define a line parsing function using the common code
  23    used in the nss_files module.  */
  24
  25 #define STRUCTURE       group
  26 #define ENTNAME         grent
  27 struct grent_data {};
  28
  29 #define TRAILING_LIST_MEMBER            gr_mem
  30 #define TRAILING_LIST_SEPARATOR_P(c)    ((c) == ',')
  31 #include "../nss/nss_files/files-parse.c"
  32 LINE_PARSER
  33 (,
  34  STRING_FIELD (result->gr_name, ISCOLON, 0);
  35  STRING_FIELD (result->gr_passwd, ISCOLON, 0);
  36  INT_FIELD (result->gr_gid, ISCOLON, 0, 10,);
  37  )
  38
  39
  40 /* Read one entry from the given stream.  */
  41 struct group *
  42 fgetgrent (FILE *stream)
  43 {
  44   static char buffer[BUFSIZ];
  45   static struct group result;
  46   char *p;
  47
  48   do
  49     {
  50       p = fgets (buffer, sizeof buffer, stream);
  51       if (p == NULL)
  52         return NULL;
  53
  54       /* Skip leading blanks.  */
  55       while (isspace (*p))
  56         ++p;
  57     } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
  58              /* Parse the line.  If it is invalid, loop to
  59                 get the next line of the file to parse.  */
  60              ! parse_line (p, &result, (void *) buffer, sizeof buffer));
  61
  62   return &result;
  63 }