lib/readlink.c

   1 /* Stub for readlink().
   2    Copyright (C) 2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #if HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <errno.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25
  26 #if !HAVE_READLINK
  27
  28 /* readlink() substitute for systems that don't have a readlink() function,
  29    such as DJGPP 2.03 and mingw32.  */
  30
  31 /* The official POSIX return type of readlink() is ssize_t, but since here
  32    we have no declaration in a public header file, we use 'int' as return
  33    type.  */
  34
  35 int
  36 readlink (const char *path, char *buf, size_t bufsize)
  37 {
  38   struct stat statbuf;
  39
  40   /* In general we should use lstat() here, not stat().  But on platforms
  41      without symbolic links lstat() - if it exists - would be equivalent to
  42      stat(), therefore we can use stat().  This saves us a configure check.  */
  43   if (stat (path, &statbuf) >= 0)
  44     errno = EINVAL;
  45   return -1;
  46 }
  47
  48 #endif