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basename.c revision 1.5 
      1 /*	$NetBSD: basename.c,v 1.5 2002/10/17 02:06:04 thorpej 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 1.5 2002/10/17 02:06:04 thorpej 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(path)
     56 	char *path;
     57 {
     58 	static char singledot[] = ".";
     59 	static char result[PATH_MAX];
     60 	char *p, *lastp;
     61 	size_t len;
     62 
     63 	/*
     64 	 * If `path' is a null pointer or points to an empty string,
     65 	 * return a pointer to the string ".".
     66 	 */
     67 	if ((path == NULL) || (*path == '\0'))
     68 		return (singledot);
     69 
     70 	/* Strip trailing slashes, if any. */
     71 	lastp = path + strlen(path) - 1;
     72 	while (lastp != path && *lastp == '/')
     73 		lastp--;
     74 
     75 	/* Now find the beginning of this (final) component. */
     76 	p = lastp;
     77 	while (p != path && *(p - 1) != '/')
     78 		p--;
     79 
     80 	/* ...and copy the result into the result buffer. */
     81 	len = (lastp - p) + 1 /* last char */;
     82 	if (len > (PATH_MAX - 1))
     83 		len = PATH_MAX - 1;
     84 
     85 	memcpy(result, p, len);
     86 	result[len] = '\0';
     87 
     88 	return (result);
     89 }
     90 #endif
     91