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
40 # ifdef STAT_MACROS_BROKEN
46 # define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
52 # ifndef HAVE_DECL_FREE
53 "this configure-time declaration test was not run"
61 /* lstat works differently on Linux and Solaris systems. POSIX (see
62 `pathname resolution' in the glossary) requires that programs like `ls'
63 take into consideration the fact that FILE has a trailing slash when
64 FILE is a symbolic link. On Linux systems, the lstat function already
65 has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
66 `lstat("symlink/.",sbuf)', but on Solaris it does not.
68 If FILE has a trailing slash and specifies a symbolic link,
69 then append a `.' to FILE and call lstat a second time. */
72 slash_aware_lstat (const char *file, struct stat *sbuf)
77 int lstat_result = lstat (file, sbuf);
79 if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
83 if (file[len - 1] != '/')
86 /* FILE refers to a symbolic link and the name ends with a slash.
87 Append a `.' to FILE and repeat the lstat call. */
89 /* Add one for the `.' we'll append, and one more for the trailing NUL. */
90 new_file = xmalloc (len + 1 + 1);
91 memcpy (new_file, file, len);
93 new_file[len + 1] = 0;
95 lstat_result = lstat (new_file, sbuf);
100 #endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
102 /* This is a wrapper for stat/lstat.
103 If FILE is the empty string, fail with errno == ENOENT.
104 Otherwise, return the result of calling the real stat/lstat.
106 This works around the bug in some systems whereby stat/lstat succeeds when
107 given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
110 /* This function also provides a version of lstat with consistent semantics
111 when FILE specifies a symbolic link and has a trailing slash. */
114 # define rpl_xstat rpl_lstat
115 # if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
116 # define xstat_return_val(F, S) slash_aware_lstat (F, S)
118 # define xstat_return_val(F, S) lstat (F, S)
121 # define rpl_xstat rpl_stat
122 # define xstat_return_val(F, S) stat (F, S)
126 rpl_xstat (const char *file, struct stat *sbuf)
128 if (file && *file == 0)
134 return xstat_return_val (file, sbuf);