pwd/fgetpwent_r.c

   1 /* Copyright (C) 1991, 1996-1999, 2011 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <ctype.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <pwd.h>
  23
  24 #define flockfile(s) _IO_flockfile (s)
  25 #define funlockfile(s) _IO_funlockfile (s)
  26
  27 /* Define a line parsing function using the common code
  28    used in the nss_files module.  */
  29
  30 #define STRUCTURE       passwd
  31 #define ENTNAME         pwent
  32 struct pwent_data {};
  33
  34 #include <nss/nss_files/files-parse.c>
  35 LINE_PARSER
  36 (,
  37  STRING_FIELD (result->pw_name, ISCOLON, 0);
  38  if (line[0] == '\0'
  39      && (result->pw_name[0] == '+' || result->pw_name[0] == '-'))
  40    {
  41      /* This a special case.  We allow lines containing only a `+' sign
  42         since this is used for nss_compat.  All other services will
  43         reject this entry later.  Initialize all other fields now.  */
  44      result->pw_passwd = NULL;
  45      result->pw_uid = 0;
  46      result->pw_gid = 0;
  47      result->pw_gecos = NULL;
  48      result->pw_dir = NULL;
  49      result->pw_shell = NULL;
  50    }
  51  else
  52    {
  53      STRING_FIELD (result->pw_passwd, ISCOLON, 0);
  54      if (result->pw_name[0] == '+' || result->pw_name[0] == '-')
  55        {
  56          INT_FIELD_MAYBE_NULL (result->pw_uid, ISCOLON, 0, 10, , 0)
  57          INT_FIELD_MAYBE_NULL (result->pw_gid, ISCOLON, 0, 10, , 0)
  58        }
  59      else
  60        {
  61          INT_FIELD (result->pw_uid, ISCOLON, 0, 10,)
  62          INT_FIELD (result->pw_gid, ISCOLON, 0, 10,)
  63        }
  64      STRING_FIELD (result->pw_gecos, ISCOLON, 0);
  65      STRING_FIELD (result->pw_dir, ISCOLON, 0);
  66      result->pw_shell = line;
  67    }
  68  )
  69
  70
  71 /* Read one entry from the given stream.  */
  72 int
  73 __fgetpwent_r (FILE *stream, struct passwd *resbuf, char *buffer,
  74                size_t buflen, struct passwd **result)
  75 {
  76   char *p;
  77
  78   flockfile (stream);
  79   do
  80     {
  81       buffer[buflen - 1] = '\xff';
  82       p = fgets_unlocked (buffer, buflen, stream);
  83       if (p == NULL && feof_unlocked (stream))
  84         {
  85           funlockfile (stream);
  86           *result = NULL;
  87           __set_errno (ENOENT);
  88           return errno;
  89         }
  90       if (p == NULL || buffer[buflen - 1] != '\xff')
  91         {
  92           funlockfile (stream);
  93           *result = NULL;
  94           __set_errno (ERANGE);
  95           return errno;
  96         }
  97
  98       /* Skip leading blanks.  */
  99       while (isspace (*p))
 100         ++p;
 101     } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
 102              /* Parse the line.  If it is invalid, loop to
 103                 get the next line of the file to parse.  */
 104              ! parse_line (p, resbuf, (void *) buffer, buflen, &errno));
 105
 106   funlockfile (stream);
 107
 108   *result = resbuf;
 109   return 0;
 110 }
 111 weak_alias (__fgetpwent_r, fgetpwent_r)