gshadow/fgetsgent_r.c

   1 /* Copyright (C) 2009-2017 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <ctype.h>
  19 #include <errno.h>
  20 #include <gshadow.h>
  21 #include <stdio.h>
  22
  23 /* Define a line parsing function using the common code
  24    used in the nss_files module.  */
  25
  26 #define STRUCTURE       sgrp
  27 #define ENTNAME         sgent
  28 #define EXTERN_PARSER   1
  29 struct sgent_data {};
  30
  31 #include <nss/nss_files/files-parse.c>
  32
  33
  34 /* Read one shadow entry from the given stream.  */
  35 int
  36 __fgetsgent_r (FILE *stream, struct sgrp *resbuf, char *buffer, size_t buflen,
  37                struct sgrp **result)
  38 {
  39   char *p;
  40
  41   _IO_flockfile (stream);
  42   do
  43     {
  44       buffer[buflen - 1] = '\xff';
  45       p = fgets_unlocked (buffer, buflen, stream);
  46       if (p == NULL && feof_unlocked (stream))
  47         {
  48           _IO_funlockfile (stream);
  49           *result = NULL;
  50           __set_errno (ENOENT);
  51           return errno;
  52         }
  53       if (p == NULL || buffer[buflen - 1] != '\xff')
  54         {
  55           _IO_funlockfile (stream);
  56           *result = NULL;
  57           __set_errno (ERANGE);
  58           return errno;
  59         }
  60
  61       /* Skip leading blanks.  */
  62       while (isspace (*p))
  63         ++p;
  64     } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
  65              /* Parse the line.  If it is invalid, loop to
  66                 get the next line of the file to parse.  */
  67              ! parse_line (buffer, (void *) resbuf, (void *) buffer, buflen,
  68                            &errno));
  69
  70   _IO_funlockfile (stream);
  71
  72   *result = resbuf;
  73   return 0;
  74 }
  75 weak_alias (__fgetsgent_r, fgetsgent_r)