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
20 /* written by Jim Meyering */
21
22 #ifdef HAVE_CONFIG_H
23 # include <config.h>
24 #endif
25
26 /* The specification of these functions is in sys_stat.h. But we cannot
27 include this include file here, because on some systems, a
28 "#define lstat lstat64" is being used, and sys_stat.h deletes this
29 definition. */
30
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "stat-macros.h"
37 #include "xalloc.h"
38
39 /* lstat works differently on Linux and Solaris systems. POSIX (see
40 `pathname resolution' in the glossary) requires that programs like `ls'
41 take into consideration the fact that FILE has a trailing slash when
42 FILE is a symbolic link. On Linux systems, the lstat function already
43 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
44 `lstat("symlink/.",sbuf)', but on Solaris it does not.
45
46 If FILE has a trailing slash and specifies a symbolic link,
47 then append a `.' to FILE and call lstat a second time. */
48
49 int
rpl_lstat(const char * file,struct stat * sbuf)50 rpl_lstat (const char *file, struct stat *sbuf)
51 {
52 size_t len;
53 char *new_file;
54
55 int lstat_result = lstat (file, sbuf);
56
57 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
58 return lstat_result;
59
60 len = strlen (file);
61 if (len == 0 || file[len - 1] != '/')
62 return lstat_result;
63
64 /* FILE refers to a symbolic link and the name ends with a slash.
65 Append a `.' to FILE and repeat the lstat call. */
66
67 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
68 new_file = xmalloc (len + 1 + 1);
69 memcpy (new_file, file, len);
70 new_file[len] = '.';
71 new_file[len + 1] = 0;
72
73 lstat_result = lstat (new_file, sbuf);
74 free (new_file);
75
76 return lstat_result;
77 }
78