1 /* Work around the bug in some systems whereby stat/lstat succeeds when
2 given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
3 has this bug. Also work around a deficiency in Solaris systems (up to at
4 least Solaris 9) regarding the semantics of `lstat ("symlink/", sbuf).'
6 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free
7 Software Foundation, Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software Foundation,
21 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 /* written by Jim Meyering */
27 #include <sys/types.h>
33 #if defined LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
37 # ifdef STAT_MACROS_BROKEN
43 # define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
51 /* lstat works differently on Linux and Solaris systems. POSIX (see
52 `pathname resolution' in the glossary) requires that programs like `ls'
53 take into consideration the fact that FILE has a trailing slash when
54 FILE is a symbolic link. On Linux systems, the lstat function already
55 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
56 `lstat("symlink/.",sbuf)', but on Solaris it does not.
58 If FILE has a trailing slash and specifies a symbolic link,
59 then append a `.' to FILE and call lstat a second time. */
62 slash_aware_lstat (const char *file, struct stat *sbuf)
67 int lstat_result = lstat (file, sbuf);
69 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
73 if (file[len - 1] != '/')
76 /* FILE refers to a symbolic link and the name ends with a slash.
77 Append a `.' to FILE and repeat the lstat call. */
79 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
80 new_file = xmalloc (len + 1 + 1);
81 memcpy (new_file, file, len);
83 new_file[len + 1] = 0;
85 lstat_result = lstat (new_file, sbuf);
90 #endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
92 /* This is a wrapper for stat/lstat.
93 If FILE is the empty string, fail with errno == ENOENT.
94 Otherwise, return the result of calling the real stat/lstat.
96 This works around the bug in some systems whereby stat/lstat succeeds when
97 given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
100 /* This function also provides a version of lstat with consistent semantics
101 when FILE specifies a symbolic link and has a trailing slash. */
104 # define rpl_xstat rpl_lstat
105 # if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
106 # define xstat_return_val(F, S) slash_aware_lstat (F, S)
108 # define xstat_return_val(F, S) lstat (F, S)
111 # define rpl_xstat rpl_stat
112 # define xstat_return_val(F, S) stat (F, S)
116 rpl_xstat (const char *file, struct stat *sbuf)
118 if (file && *file == 0)
124 return xstat_return_val (file, sbuf);