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/* $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $ */ |
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|
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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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* |
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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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|
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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#ifndef HAVE_DIRNAME |
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|
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#include <sys/cdefs.h> |
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#include <sys/param.h> |
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#ifdef HAVE_LIBGEN_H |
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#include <libgen.h> |
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#endif |
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#ifdef HAVE_LIMITS_H |
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#include <limits.h> |
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#endif |
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#ifdef HAVE_STRING_H |
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#include <string.h> |
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#endif |
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#ifndef PATH_MAX |
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# define PATH_MAX 1024 |
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#endif |
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#ifndef MIN |
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# define MIN(a, b) ((a < b) ? a : b) |
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#endif |
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|
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|
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static size_t |
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xdirname_r(const char *path, char *buf, size_t buflen) |
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{ |
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const char *endp; |
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size_t len; |
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|
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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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path = "."; |
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len = 1; |
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goto out; |
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} |
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|
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/* Strip trailing slashes, if any. */ |
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endp = path + strlen(path) - 1; |
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while (endp != path && *endp == '/') |
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endp--; |
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|
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/* Find the start of the dir */ |
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while (endp > path && *endp != '/') |
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endp--; |
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|
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if (endp == path) { |
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path = *endp == '/' ? "/" : "."; |
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len = 1; |
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goto out; |
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} |
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|
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do |
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endp--; |
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while (endp > path && *endp == '/'); |
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|
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len = endp - path + 1; |
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out: |
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if (buf != NULL && buflen != 0) { |
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buflen = MIN(len, buflen - 1); |
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memcpy(buf, path, buflen); |
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buf[buflen] = '\0'; |
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} |
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return len; |
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} |
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|
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char * |
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dirname(char *path) |
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{ |
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static char result[PATH_MAX]; |
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(void)xdirname_r(path, result, sizeof(result)); |
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return result; |
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} |
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|
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#ifdef MAIN |
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#include <stdlib.h> |
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#include <stdio.h> |
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|
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int |
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main(int argc, char *argv[]) |
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{ |
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printf("%s\n", dirname(argv[1])); |
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exit(0); |
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} |
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#endif |
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#endif |
