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/* Work around a bug of lstat on some systems
Copyright (C) 1997-1999, 2000-2006, 2008 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
/* Get the original definition of open. It might be defined as a macro. */
#define __need_system_sys_stat_h
#include <sys/types.h>
#include <sys/stat.h>
#undef __need_system_sys_stat_h
static inline int
orig_lstat (const char *filename, struct stat *buf)
{
return lstat (filename, buf);
}
/* Specification. */
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
/* lstat works differently on Linux and Solaris systems. POSIX (see
`pathname resolution' in the glossary) requires that programs like
`ls' take into consideration the fact that FILE has a trailing slash
when FILE is a symbolic link. On Linux and Solaris 10 systems, the
lstat function already has the desired semantics (in treating
`lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
but on Solaris 9 and earlier it does not.
If FILE has a trailing slash and specifies a symbolic link,
then use stat() to get more info on the referent of FILE.
If the referent is a non-directory, then set errno to ENOTDIR
and return -1. Otherwise, return stat's result. */
int
rpl_lstat (const char *file, struct stat *sbuf)
{
size_t len;
int lstat_result = orig_lstat (file, sbuf);
if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
return lstat_result;
len = strlen (file);
if (len == 0 || file[len - 1] != '/')
return 0;
/* FILE refers to a symbolic link and the name ends with a slash.
Call stat() to get info about the link's referent. */
/* If stat fails, then we do the same. */
if (stat (file, sbuf) != 0)
return -1;
/* If FILE references a directory, return 0. */
if (S_ISDIR (sbuf->st_mode))
return 0;
/* Here, we know stat succeeded and FILE references a non-directory.
But it was specified via a name including a trailing slash.
Fail with errno set to ENOTDIR to indicate the contradiction. */
errno = ENOTDIR;
return -1;
}
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