pwd/fgetpwent_r.c

   1 /* Copyright (C) 1991-2021 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 <stdio.h>
  21 #include <pwd.h>
  22
  23 /* Define a line parsing function using the common code
  24    used in the nss_files module.  */
  25
  26 #define STRUCTURE       passwd
  27 #define ENTNAME         pwent
  28 struct pwent_data {};
  29
  30 #include <nss/nss_files/files-parse.c>
  31 LINE_PARSER
  32 (,
  33  STRING_FIELD (result->pw_name, ISCOLON, 0);
  34  if (line[0] == '\0'
  35      && (result->pw_name[0] == '+' || result->pw_name[0] == '-'))
  36    {
  37      /* This a special case.  We allow lines containing only a `+' sign
  38         since this is used for nss_compat.  All other services will
  39         reject this entry later.  Initialize all other fields now.  */
  40      result->pw_passwd = NULL;
  41      result->pw_uid = 0;
  42      result->pw_gid = 0;
  43      result->pw_gecos = NULL;
  44      result->pw_dir = NULL;
  45      result->pw_shell = NULL;
  46    }
  47  else
  48    {
  49      STRING_FIELD (result->pw_passwd, ISCOLON, 0);
  50      if (result->pw_name[0] == '+' || result->pw_name[0] == '-')
  51        {
  52          INT_FIELD_MAYBE_NULL (result->pw_uid, ISCOLON, 0, 10, , 0)
  53          INT_FIELD_MAYBE_NULL (result->pw_gid, ISCOLON, 0, 10, , 0)
  54        }
  55      else
  56        {
  57          INT_FIELD (result->pw_uid, ISCOLON, 0, 10,)
  58          INT_FIELD (result->pw_gid, ISCOLON, 0, 10,)
  59        }
  60      STRING_FIELD (result->pw_gecos, ISCOLON, 0);
  61      STRING_FIELD (result->pw_dir, ISCOLON, 0);
  62      result->pw_shell = line;
  63    }
  64  )
  65
  66
  67 /* Read one entry from the given stream.  */
  68 int
  69 __fgetpwent_r (FILE *stream, struct passwd *resbuf, char *buffer,
  70                size_t buflen, struct passwd **result)
  71 {
  72   int ret = __nss_fgetent_r (stream, resbuf, buffer, buflen, parse_line);
  73   if (ret == 0)
  74     *result = resbuf;
  75   else
  76     *result = NULL;
  77   return ret;
  78 }
  79 weak_alias (__fgetpwent_r, fgetpwent_r)