shadow/fgetspent_r.c

   1 /* Copyright (C) 1996-2019 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <ctype.h>
  19 #include <errno.h>
  20 #include <shadow.h>
  21 #include <stdio.h>
  22
  23 #define flockfile(s) _IO_flockfile (s)
  24 #define funlockfile(s) _IO_funlockfile (s)
  25
  26 /* Define a line parsing function using the common code
  27    used in the nss_files module.  */
  28
  29 #define STRUCTURE       spwd
  30 #define ENTNAME         spent
  31 #define EXTERN_PARSER   1
  32 struct spent_data {};
  33
  34 #include <nss/nss_files/files-parse.c>
  35
  36
  37 /* Read one shadow entry from the given stream.  */
  38 int
  39 __fgetspent_r (FILE *stream, struct spwd *resbuf, char *buffer, size_t buflen,
  40                struct spwd **result)
  41 {
  42   char *p;
  43
  44   flockfile (stream);
  45   do
  46     {
  47       buffer[buflen - 1] = '\xff';
  48       p = fgets_unlocked (buffer, buflen, stream);
  49       if (p == NULL && feof_unlocked (stream))
  50         {
  51           funlockfile (stream);
  52           *result = NULL;
  53           __set_errno (ENOENT);
  54           return errno;
  55         }
  56       if (p == NULL || buffer[buflen - 1] != '\xff')
  57         {
  58           funlockfile (stream);
  59           *result = NULL;
  60           __set_errno (ERANGE);
  61           return errno;
  62         }
  63
  64       /* Skip leading blanks.  */
  65       while (isspace (*p))
  66         ++p;
  67     } while (*p == '\0' || *p == '#' /* Ignore empty and comment lines.  */
  68              /* Parse the line.  If it is invalid, loop to
  69                 get the next line of the file to parse.  */
  70              || ! parse_line (buffer, (void *) resbuf, NULL, 0, &errno));
  71
  72   funlockfile (stream);
  73
  74   *result = resbuf;
  75   return 0;
  76 }
  77 weak_alias (__fgetspent_r, fgetspent_r)