You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.3 KiB
74 lines
2.3 KiB
/* Stub for readlink(). |
|
Copyright (C) 2003-2007, 2009-2017 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 */
|
|
|