pwd/fgetpwent_r.c

   1 /* Copyright (C) 1991, 1996, 1997, 1998 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 <stdio.h>
  22 #include <pwd.h>
  23
  24 /* Define a line parsing function using the common code
  25    used in the nss_files module.  */
  26
  27 #define STRUCTURE       passwd
  28 #define ENTNAME         pwent
  29 struct pwent_data {};
  30
  31 #include <nss/nss_files/files-parse.c>
  32 LINE_PARSER
  33 (,
  34  STRING_FIELD (result->pw_name, ISCOLON, 0);
  35  if (line[0] == '\0'
  36      && (result->pw_name[0] == '+' || result->pw_name[0] == '-'))
  37    {
  38      /* This a special case.  We allow lines containing only a `+' sign
  39         since this is used for nss_compat.  All other services will
  40         reject this entry later.  Initialize all other fields now.  */
  41      result->pw_passwd = NULL;
  42      result->pw_uid = 0;
  43      result->pw_gid = 0;
  44      result->pw_gecos = NULL;
  45      result->pw_dir = NULL;
  46      result->pw_shell = NULL;
  47    }
  48  else
  49    {
  50      STRING_FIELD (result->pw_passwd, ISCOLON, 0);
  51      if (result->pw_name[0] == '+' || result->pw_name[0] == '-')
  52        {
  53          INT_FIELD_MAYBE_NULL (result->pw_uid, ISCOLON, 0, 10, , 0)
  54          INT_FIELD_MAYBE_NULL (result->pw_gid, ISCOLON, 0, 10, , 0)
  55        }
  56      else
  57        {
  58          INT_FIELD (result->pw_uid, ISCOLON, 0, 10,)
  59          INT_FIELD (result->pw_gid, ISCOLON, 0, 10,)
  60        }
  61      STRING_FIELD (result->pw_gecos, ISCOLON, 0);
  62      STRING_FIELD (result->pw_dir, ISCOLON, 0);
  63      result->pw_shell = line;
  64    }
  65  )
  66
  67
  68 /* Read one entry from the given stream.  */
  69 int
  70 __fgetpwent_r (FILE *stream, struct passwd *resbuf, char *buffer,
  71                size_t buflen, struct passwd **result)
  72 {
  73   char *p;
  74
  75   do
  76     {
  77       buffer[buflen - 1] = '\xff';
  78       p = fgets (buffer, buflen, stream);
  79       if (p == NULL && feof (stream))
  80         {
  81           *result = NULL;
  82           return errno;
  83         }
  84       if (p == NULL || buffer[buflen - 1] != '\xff')
  85         {
  86           *result = NULL;
  87           return errno = ERANGE;
  88         }
  89
  90       /* Skip leading blanks.  */
  91       while (isspace (*p))
  92         ++p;
  93     } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
  94              /* Parse the line.  If it is invalid, loop to
  95                 get the next line of the file to parse.  */
  96              ! parse_line (p, resbuf, (void *) buffer, buflen, &errno));
  97
  98   *result = resbuf;
  99   return 0;
 100 }
 101 weak_alias (__fgetpwent_r, fgetpwent_r)