install-reloc: Support multi-binary installation.

[gnulib.git] / lib / basename.c

diff --git a/lib/basename.c b/lib/basename.c
index 4087e3d..d73fd41 100644 (file)
--- a/lib/basename.c
+++ b/lib/basename.c
@@ -1,30 +1,58 @@
-/* basename.c -- return the last element in a path */
+/* basename.c -- return the last element in a file name
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+   Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2013 Free Software
+   Foundation, Inc.
 
-#ifndef FILESYSTEM_PREFIX_LEN
-# define FILESYSTEM_PREFIX_LEN(f) 0
-#endif
+   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
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
-#ifndef ISSLASH
-# define ISSLASH(c) ((c) == '/')
-#endif
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
 
-/* In general, we can't use the builtin `basename' function if available,
-   since it has different meanings in different environments.
-   In some environments the builtin `basename' modifies its argument.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "dirname.h"
+
+#include <string.h>
+#include "xalloc.h"
+#include "xstrndup.h"
 
 char *
-base_name (name)
-     char const *name;
+base_name (char const *name)
 {
-  char const *base = name += FILESYSTEM_PREFIX_LEN (name);
+  char const *base = last_component (name);
+  size_t length;
+
+  /* If there is no last component, then name is a file system root or the
+     empty string.  */
+  if (! *base)
+    return xstrndup (name, base_len (name));
+
+  /* Collapse a sequence of trailing slashes into one.  */
+  length = base_len (base);
+  if (ISSLASH (base[length]))
+    length++;
 
-  for (; *name; name++)
-    if (ISSLASH (*name))
-      base = name + 1;
+  /* On systems with drive letters, "a/b:c" must return "./b:c" rather
+     than "b:c" to avoid confusion with a drive letter.  On systems
+     with pure POSIX semantics, this is not an issue.  */
+  if (FILE_SYSTEM_PREFIX_LEN (base))
+    {
+      char *p = xmalloc (length + 3);
+      p[0] = '.';
+      p[1] = '/';
+      memcpy (p + 2, base, length);
+      p[length + 2] = '\0';
+      return p;
+    }
 
-  return (char *) base;
+  /* Finally, copy the basename.  */
+  return xstrndup (base, length);
 }