mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/* Stub for readlink().
|
|
Copyright (C) 2003-2007, 2009-2015 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/>. */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
|
#include <string.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. */
|
|
|
|
ssize_t
|
|
readlink (const char *name, char *buf _GL_UNUSED,
|
|
size_t bufsize _GL_UNUSED)
|
|
{
|
|
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 (name, &statbuf) >= 0)
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
#else /* HAVE_READLINK */
|
|
|
|
# undef readlink
|
|
|
|
/* readlink() wrapper that uses correct types, for systems like cygwin
|
|
1.5.x where readlink returns int, and which rejects trailing slash,
|
|
for Solaris 9. */
|
|
|
|
ssize_t
|
|
rpl_readlink (const char *name, char *buf, size_t bufsize)
|
|
{
|
|
# if READLINK_TRAILING_SLASH_BUG
|
|
size_t len = strlen (name);
|
|
if (len && name[len - 1] == '/')
|
|
{
|
|
/* Even if name without the slash is a symlink to a directory,
|
|
both lstat() and stat() must resolve the trailing slash to
|
|
the directory rather than the symlink. We can therefore
|
|
safely use stat() to distinguish between EINVAL and
|
|
ENOTDIR/ENOENT, avoiding extra overhead of rpl_lstat(). */
|
|
struct stat st;
|
|
if (stat (name, &st) == 0)
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
# endif /* READLINK_TRAILING_SLASH_BUG */
|
|
return readlink (name, buf, bufsize);
|
|
}
|
|
|
|
#endif /* HAVE_READLINK */
|