c10a556f9b
storage, rather than modifying their input arguments. While not reentrant, this is explcitly allowed by IEEE Std 1003.1-2001 (which allows either behavior, stating that it is implementation-dependent). The new semantics are considered less hostile/more useful by most programs which use basename(3) and/or dirname(3) (several programs in the NetBSD tree reimplement basename()/dirname() themselves to avoid modification of the input argument). This new implementation truncates results to PATH_MAX. The Std does not address this in the static storage case. However since PATH_MAX is the maximum pathname length in the Std, this should not be a problem in practice. Nontheless, it is noted in the BUGS section. See the basename(3)/dirname(3) regression tests in src/regress/lib/libc. Inspired by discussion with Niels Provos, related to PR 18647.
91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* $NetBSD: basename.c,v 1.5 2002/10/17 02:06:04 thorpej Exp $ */
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/*-
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* Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein and Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: basename.c,v 1.5 2002/10/17 02:06:04 thorpej Exp $");
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#endif /* !LIBC_SCCS && !lint */
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#include "namespace.h"
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#include <libgen.h>
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#include <limits.h>
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#include <string.h>
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#ifdef __weak_alias
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__weak_alias(basename,_basename)
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#endif
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#if !HAVE_BASENAME
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char *
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basename(path)
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char *path;
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{
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static char singledot[] = ".";
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static char result[PATH_MAX];
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char *p, *lastp;
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size_t len;
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/*
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* If `path' is a null pointer or points to an empty string,
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* return a pointer to the string ".".
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*/
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if ((path == NULL) || (*path == '\0'))
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return (singledot);
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/* Strip trailing slashes, if any. */
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lastp = path + strlen(path) - 1;
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while (lastp != path && *lastp == '/')
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lastp--;
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/* Now find the beginning of this (final) component. */
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p = lastp;
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while (p != path && *(p - 1) != '/')
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p--;
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/* ...and copy the result into the result buffer. */
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len = (lastp - p) + 1 /* last char */;
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if (len > (PATH_MAX - 1))
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len = PATH_MAX - 1;
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memcpy(result, p, len);
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result[len] = '\0';
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return (result);
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}
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#endif
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