1 /* Work around a bug of lstat on some systems
2
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free
4 Software Foundation, Inc.
5
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 2, or (at your option)
9 any later version.
10
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.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19 #include <sys/cdefs.h>
20 __RCSID("$NetBSD: lstat.c,v 1.2 2016/05/17 14:00:09 christos Exp $");
21
22
23 /* written by Jim Meyering */
24
25 #ifdef HAVE_CONFIG_H
26 # include <config.h>
27 #endif
28
29 /* The specification of these functions is in sys_stat.h. But we cannot
30 include this include file here, because on some systems, a
31 "#define lstat lstat64" is being used, and sys_stat.h deletes this
32 definition. */
33
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <stdlib.h>
37 #include <string.h>
38
39 #include "stat-macros.h"
40 #include "xalloc.h"
41
42 /* lstat works differently on Linux and Solaris systems. POSIX (see
43 `pathname resolution' in the glossary) requires that programs like `ls'
44 take into consideration the fact that FILE has a trailing slash when
45 FILE is a symbolic link. On Linux systems, the lstat function already
46 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
47 `lstat("symlink/.",sbuf)', but on Solaris it does not.
48
49 If FILE has a trailing slash and specifies a symbolic link,
50 then append a `.' to FILE and call lstat a second time. */
51
52 int
rpl_lstat(const char * file,struct stat * sbuf)53 rpl_lstat (const char *file, struct stat *sbuf)
54 {
55 size_t len;
56 char *new_file;
57
58 int lstat_result = lstat (file, sbuf);
59
60 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
61 return lstat_result;
62
63 len = strlen (file);
64 if (len == 0 || file[len - 1] != '/')
65 return lstat_result;
66
67 /* FILE refers to a symbolic link and the name ends with a slash.
68 Append a `.' to FILE and repeat the lstat call. */
69
70 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
71 new_file = xmalloc (len + 1 + 1);
72 memcpy (new_file, file, len);
73 new_file[len] = '.';
74 new_file[len + 1] = 0;
75
76 lstat_result = lstat (new_file, sbuf);
77 free (new_file);
78
79 return lstat_result;
80 }
81