Remove stat module & update lstat.

[gnulib.git] / lib / lstat.c

diff --git a/lib/lstat.c b/lib/lstat.c
index ef274b0..0d539fe 100644 (file)
--- a/lib/lstat.c
+++ b/lib/lstat.c
@@ -1,8 +1,6 @@
-/* Work around the bug in some systems whereby lstat succeeds when
-   given the zero-length file name argument.  The lstat from SunOS 4.1.4
-   has this bug.
+/* Work around a bug of lstat on some systems
 
-   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free
+   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
@@ -19,5 +17,59 @@
    along with this program; if not, write to the Free Software Foundation,
    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#define LSTAT
-#include "stat.c"
+/* written by Jim Meyering */
+
+#include <config.h>
+
+/* 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 <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.  */
+
+int
+rpl_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;
+
+  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;
+
+  lstat_result = lstat (new_file, sbuf);
+  free (new_file);
+
+  return lstat_result;
+}