gl/readlink.c

   1 /* Stub for readlink().
   2    Copyright (C) 2003-2007 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include <unistd.h>
  22
  23 #include <errno.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <stddef.h>
  27
  28 #if !HAVE_READLINK
  29
  30 /* readlink() substitute for systems that don't have a readlink() function,
  31    such as DJGPP 2.03 and mingw32.  */
  32
  33 /* The official POSIX return type of readlink() is ssize_t, but since here
  34    we have no declaration in a public header file, we use 'int' as return
  35    type.  */
  36
  37 int
  38 readlink (const char *path, char *buf, size_t bufsize)
  39 {
  40   struct stat statbuf;
  41
  42   /* In general we should use lstat() here, not stat().  But on platforms
  43      without symbolic links lstat() - if it exists - would be equivalent to
  44      stat(), therefore we can use stat().  This saves us a configure check.  */
  45   if (stat (path, &statbuf) >= 0)
  46     errno = EINVAL;
  47   return -1;
  48 }
  49
  50 #endif