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basename.c revision 1.6 
      1 /*	$NetBSD: basename.c,v 1.6 2008/04/23 07:53:26 plunky Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein and Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 __RCSID("$NetBSD: basename.c,v 1.6 2008/04/23 07:53:26 plunky Exp $");
     42 #endif /* !LIBC_SCCS && !lint */
     43 
     44 #include "namespace.h"
     45 #include <libgen.h>
     46 #include <limits.h>
     47 #include <string.h>
     48 
     49 #ifdef __weak_alias
     50 __weak_alias(basename,_basename)
     51 #endif
     52 
     53 #if !HAVE_BASENAME
     54 char *
     55 basename(const char *path)
     56 {
     57 	static char singledot[] = ".";
     58 	static char result[PATH_MAX];
     59 	const char *p, *lastp;
     60 	size_t len;
     61 
     62 	/*
     63 	 * If `path' is a null pointer or points to an empty string,
     64 	 * return a pointer to the string ".".
     65 	 */
     66 	if ((path == NULL) || (*path == '\0'))
     67 		return (singledot);
     68 
     69 	/* Strip trailing slashes, if any. */
     70 	lastp = path + strlen(path) - 1;
     71 	while (lastp != path && *lastp == '/')
     72 		lastp--;
     73 
     74 	/* Now find the beginning of this (final) component. */
     75 	p = lastp;
     76 	while (p != path && *(p - 1) != '/')
     77 		p--;
     78 
     79 	/* ...and copy the result into the result buffer. */
     80 	len = (lastp - p) + 1 /* last char */;
     81 	if (len > (PATH_MAX - 1))
     82 		len = PATH_MAX - 1;
     83 
     84 	memcpy(result, p, len);
     85 	result[len] = '\0';
     86 
     87 	return (result);
     88 }
     89 #endif
     90