-/* Work around the bug in some systems whereby lstat succeeds when
- given the zero-length file name argument. The lstat from SunOS4.1.4
- has this bug.
- Copyright (C) 1997 Free Software Foundation, Inc.
+/* Work around a bug of lstat on some systems
+
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free
+ Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* written by Jim Meyering */
-#include <config.h>
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* The specification of these functions is in sys_stat.h. But we cannot
+ include this include file here, because on some systems, a
+ "#define lstat lstat64" is being used, and sys_stat.h deletes this
+ definition. */
+
#include <sys/types.h>
#include <sys/stat.h>
-#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
+#include <stdlib.h>
+#include <string.h>
+
+#include "stat-macros.h"
+#include "xalloc.h"
-/* FIXME: describe. */
+/* lstat works differently on Linux and Solaris systems. POSIX (see
+ `pathname resolution' in the glossary) requires that programs like `ls'
+ take into consideration the fact that FILE has a trailing slash when
+ FILE is a symbolic link. On Linux systems, the lstat function already
+ has the desired semantics (in treating `lstat("symlink/",sbuf)' just like
+ `lstat("symlink/.",sbuf)', but on Solaris it does not.
+
+ If FILE has a trailing slash and specifies a symbolic link,
+ then append a `.' to FILE and call lstat a second time. */
int
-lstat (file, sbuf)
- const char *file;
- struct stat *sbuf;
+rpl_lstat (const char *file, struct stat *sbuf)
{
- if (file && *file == 0)
- {
- errno = EINVAL;
- return -1;
- }
+ size_t len;
+ char *new_file;
+
+ int lstat_result = lstat (file, sbuf);
+
+ if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
+ return lstat_result;
+
+ len = strlen (file);
+ if (len == 0 || file[len - 1] != '/')
+ return lstat_result;
+
+ /* FILE refers to a symbolic link and the name ends with a slash.
+ Append a `.' to FILE and repeat the lstat call. */
+
+ /* Add one for the `.' we'll append, and one more for the trailing NUL. */
+ new_file = xmalloc (len + 1 + 1);
+ memcpy (new_file, file, len);
+ new_file[len] = '.';
+ new_file[len + 1] = 0;
-#undef lstat
+ lstat_result = lstat (new_file, sbuf);
+ free (new_file);
- return lstat (file, sbuf);
+ return lstat_result;
}