-/* Work around the bug in some systems whereby stat succeeds when
- given the zero-length file name argument. The stat from SunOS4.1.4
- has this bug.
- Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+/* Work around the bug in some systems whereby stat/lstat succeeds when
+ given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
+ has this bug. Also work around a deficiency in Solaris systems (up to at
+ least Solaris 9) regarding the semantics of `lstat ("symlink/", sbuf).'
+
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 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
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
+#if defined LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
+# include <stdlib.h>
+# include <string.h>
+
+# include "stat-macros.h"
+# include "xalloc.h"
+
+/* 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. */
+
+static int
+slash_aware_lstat (const char *file, struct stat *sbuf)
+{
+ size_t len;
+ char *new_file;
+
+ int lstat_result = lstat (file, sbuf);
+
+ if (lstat_result != 0 || !S_ISLNK (sbuf->st_mode))
+ return lstat_result;
-/* This is a wrapper for stat(2).
+ len = strlen (file);
+ if (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;
+
+ lstat_result = lstat (new_file, sbuf);
+ free (new_file);
+
+ return lstat_result;
+}
+#endif /* LSTAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK */
+
+/* This is a wrapper for stat/lstat.
If FILE is the empty string, fail with errno == ENOENT.
- Otherwise, return the result of calling the real stat.
+ Otherwise, return the result of calling the real stat/lstat.
- This works around the bug in some systems whereby stat succeeds when
- given the zero-length file name argument. The stat from SunOS4.1.4
+ This works around the bug in some systems whereby stat/lstat succeeds when
+ given the zero-length file name argument. The stat/lstat from SunOS 4.1.4
has this bug. */
+/* This function also provides a version of lstat with consistent semantics
+ when FILE specifies a symbolic link and has a trailing slash. */
+
+#ifdef LSTAT
+# define rpl_xstat rpl_lstat
+# if ! LSTAT_FOLLOWS_SLASHED_SYMLINK
+# define xstat_return_val(F, S) slash_aware_lstat (F, S)
+# else
+# define xstat_return_val(F, S) lstat (F, S)
+# endif
+#else
+# define rpl_xstat rpl_stat
+# define xstat_return_val(F, S) stat (F, S)
+#endif
+
int
-rpl_stat (const char *file, struct stat *sbuf)
+rpl_xstat (const char *file, struct stat *sbuf)
{
if (file && *file == 0)
{
return -1;
}
- return stat (file, sbuf);
+ return xstat_return_val (file, sbuf);
}