80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* $OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
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#endif /* not lint */
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#include <errno.h>
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#include <libgen.h>
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#include <string.h>
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#include <sys/param.h>
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char *
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dirname(path)
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const char *path;
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{
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static char bname[MAXPATHLEN];
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register const char *endp;
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/* Empty or NULL string gets treated as "." */
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if (path == NULL || *path == '\0') {
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(void)strcpy(bname, ".");
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return(bname);
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}
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/* Strip trailing slashes */
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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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/* Find the start of the dir */
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while (endp > path && *endp != '/')
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endp--;
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/* Either the dir is "/" or there are no slashes */
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if (endp == path) {
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(void)strcpy(bname, *endp == '/' ? "/" : ".");
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return(bname);
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} else {
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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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if (endp - path + 2 > sizeof(bname)) {
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errno = ENAMETOOLONG;
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return(NULL);
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}
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(void)strncpy(bname, path, endp - path + 1);
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bname[endp - path + 1] = '\0';
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return(bname);
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}
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