1 /* Work around a bug of lstat on some systems
3 Copyright (C) 1997-1999, 2000-2006, 2008-2009 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* written by Jim Meyering */
24 /* On systems that lack symlinks, our replacement <sys/stat.h> already
25 defined lstat as stat, so there is nothing further to do other than
26 avoid an empty file. */
28 #else /* HAVE_LSTAT */
30 /* Get the original definition of lstat. It might be defined as a macro. */
31 # define __need_system_sys_stat_h
32 # include <sys/types.h>
33 # include <sys/stat.h>
34 # undef __need_system_sys_stat_h
37 orig_lstat (const char *filename, struct stat *buf)
39 return lstat (filename, buf);
43 # include <sys/stat.h>
48 /* lstat works differently on Linux and Solaris systems. POSIX (see
49 `pathname resolution' in the glossary) requires that programs like
50 `ls' take into consideration the fact that FILE has a trailing slash
51 when FILE is a symbolic link. On Linux and Solaris 10 systems, the
52 lstat function already has the desired semantics (in treating
53 `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
54 but on Solaris 9 and earlier it does not.
56 If FILE has a trailing slash and specifies a symbolic link,
57 then use stat() to get more info on the referent of FILE.
58 If the referent is a non-directory, then set errno to ENOTDIR
59 and return -1. Otherwise, return stat's result. */
62 rpl_lstat (const char *file, struct stat *sbuf)
65 int lstat_result = orig_lstat (file, sbuf);
67 if (lstat_result != 0)
70 /* This replacement file can blindly check against '/' rather than
71 using the ISSLASH macro, because all platforms with '\\' either
72 lack symlinks (mingw) or have working lstat (cygwin) and thus do
73 not compile this file. 0 len should have already been filtered
74 out above, with a failure return of ENOENT. */
76 if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
79 /* At this point, a trailing slash is only permitted on
80 symlink-to-dir; but it should have found information on the
81 directory, not the symlink. Call stat() to get info about the
82 link's referent. Our replacement stat guarantees valid results,
83 even if the symlink is not pointing to a directory. */
84 if (!S_ISLNK (sbuf->st_mode))
89 return stat (file, sbuf);
92 #endif /* HAVE_LSTAT */