-/* basename.c -- return the last element in a path
+/* basename.c -- return the last element in a file name
- Copyright (C) 1990, 1998, 1999, 2000, 2001, 2003, 2004 Free
- Software Foundation, Inc.
+ Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2012 Free Software
+ Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "dirname.h"
-#include <string.h>
-
-/* 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.
- Return the address of the last file name component of NAME. If
- NAME has no file name components because it is all slashes, return
- NAME if it is empty, the address of its last slash otherwise. */
+#include <string.h>
+#include "xalloc.h"
+#include "xstrndup.h"
char *
base_name (char const *name)
{
- char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
- char const *p;
-
- for (p = base; *p; p++)
+ 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++;
+
+ /* 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))
{
- if (ISSLASH (*p))
- {
- /* Treat multiple adjacent slashes like a single slash. */
- do p++;
- while (ISSLASH (*p));
-
- /* If the file name ends in slash, use the trailing slash as
- the basename if no non-slashes have been found. */
- if (! *p)
- {
- if (ISSLASH (*base))
- base = p - 1;
- break;
- }
-
- /* *P is a non-slash preceded by a slash. */
- base = p;
- }
+ char *p = xmalloc (length + 3);
+ p[0] = '.';
+ p[1] = '/';
+ memcpy (p + 2, base, length);
+ p[length + 2] = '\0';
+ return p;
}
- return (char *) base;
-}
-
-/* Return the length of of the basename NAME. Typically NAME is the
- value returned by base_name. Act like strlen (NAME), except omit
- redundant trailing slashes. */
-
-size_t
-base_len (char const *name)
-{
- size_t len;
-
- for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
- continue;
-
- return len;
+ /* Finally, copy the basename. */
+ return xstrndup (base, length);
}