readlink.c

来自「libiconv是一个很不错的字符集转换库。程序接口也很简单」· C语言 代码 · 共 49 行

/* Stub for readlink().
   Copyright (C) 2003 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>

#if !HAVE_READLINK

/* readlink() substitute for systems that don't have a readlink() function,
   such as DJGPP 2.03 and mingw32.  */

/* The official POSIX return type of readlink() is ssize_t, but since here
   we have no declaration in a public header file, we use 'int' as return
   type.  */

int
readlink (const char *path, char *buf, size_t bufsize)
{
  struct stat statbuf;

  /* In general we should use lstat() here, not stat().  But on platforms
     without symbolic links lstat() - if it exists - would be equivalent to
     stat(), therefore we can use stat().  This saves us a configure check.  */
  if (stat (path, &statbuf) >= 0)
    errno = EINVAL;
  return -1;
}

#endif