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