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