lib/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 Lesser General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) 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 Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <unistd.h>
  21
  22 #include <errno.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <stddef.h>
  26
  27 #if !HAVE_READLINK
  28
  29 /* readlink() substitute for systems that don't have a readlink() function,
  30    such as DJGPP 2.03 and mingw32.  */
  31
  32 /* The official POSIX return type of readlink() is ssize_t, but since here
  33    we have no declaration in a public header file, we use 'int' as return
  34    type.  */
  35
  36 int
  37 readlink (const char *path, char *buf, size_t bufsize)
  38 {
  39   struct stat statbuf;
  40
  41   /* In general we should use lstat() here, not stat().  But on platforms
  42      without symbolic links lstat() - if it exists - would be equivalent to
  43      stat(), therefore we can use stat().  This saves us a configure check.  */
  44   if (stat (path, &statbuf) >= 0)
  45     errno = EINVAL;
  46   return -1;
  47 }
  48
  49 #endif