Home | History | Annotate | Line # | Download | only in gen
basename.c revision 1.8 
      1 /*	$NetBSD: basename.c,v 1.8 2008/05/10 22:39:40 christos 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: basename.c,v 1.8 2008/05/10 22:39:40 christos Exp $");
     35 #endif /* !LIBC_SCCS && !lint */
     36 
     37 #include "namespace.h"
     38 #include <libgen.h>
     39 #include <limits.h>
     40 #include <string.h>
     41 
     42 #ifdef __weak_alias
     43 __weak_alias(basename,_basename)
     44 #endif
     45 
     46 #if !HAVE_BASENAME
     47 char *
     48 basename(char *path)
     49 {
     50 	static char singledot[] = ".";
     51 	static char result[PATH_MAX];
     52 	const char *p, *lastp;
     53 	size_t len;
     54 
     55 	/*
     56 	 * If `path' is a null pointer or points to an empty string,
     57 	 * return a pointer to the string ".".
     58 	 */
     59 	if ((path == NULL) || (*path == '\0'))
     60 		return (singledot);
     61 
     62 	/* Strip trailing slashes, if any. */
     63 	lastp = path + strlen(path) - 1;
     64 	while (lastp != path && *lastp == '/')
     65 		lastp--;
     66 
     67 	/* Now find the beginning of this (final) component. */
     68 	p = lastp;
     69 	while (p != path && *(p - 1) != '/')
     70 		p--;
     71 
     72 	/* ...and copy the result into the result buffer. */
     73 	len = (lastp - p) + 1 /* last char */;
     74 	if (len > (PATH_MAX - 1))
     75 		len = PATH_MAX - 1;
     76 
     77 	memcpy(result, p, len);
     78 	result[len] = '\0';
     79 
     80 	return (result);
     81 }
     82 #endif
     83