[openssh.git] / openbsd-compat / dirname.c

/*	$OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $	*/

/*
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"
#ifndef HAVE_DIRNAME

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */

#include <errno.h>
#include <string.h>
#include <sys/param.h>

char *
dirname(path)
	const char *path;
{
	static char bname[MAXPATHLEN];
	register const char *endp;

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		(void)strlcpy(bname, ".", sizeof bname);
		return(bname);
	}

	/* Strip trailing slashes */
	endp = path + strlen(path) - 1;
	while (endp > path && *endp == '/')
		endp--;

	/* Find the start of the dir */
	while (endp > path && *endp != '/')
		endp--;

	/* Either the dir is "/" or there are no slashes */
	if (endp == path) {
		(void)strlcpy(bname, *endp == '/' ? "/" : ".", sizeof bname);
		return(bname);
	} else {
		do {
			endp--;
		} while (endp > path && *endp == '/');
	}

	if (endp - path + 2 > sizeof(bname)) {
		errno = ENAMETOOLONG;
		return(NULL);
	}
	strlcpy(bname, path, endp - path + 2);
	return(bname);
}
#endif
Commit	Line	Data
ac8802eb	1	/* $OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $ */
b4d02860	2
	3	/*
	4	* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. The name of the author may not be used to endorse or promote products
	16	* derived from this software without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	19	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	20	* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
	21	* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	22	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	23	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
	24	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	25	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	26	* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	27	* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	28	*/
	29
	30	#include "includes.h"
	31	#ifndef HAVE_DIRNAME
	32
	33	#if defined(LIBC_SCCS) && !defined(lint)
ac8802eb	34	static char rcsid[] = "$OpenBSD: dirname.c,v 1.7 2002/05/24 21:22:37 deraadt Exp $";
b4d02860	35	#endif /* LIBC_SCCS and not lint */
	36
	37	#include <errno.h>
	38	#include <string.h>
	39	#include <sys/param.h>
	40
	41	char *
	42	dirname(path)
	43	const char *path;
	44	{
	45	static char bname[MAXPATHLEN];
	46	register const char *endp;
	47
	48	/* Empty or NULL string gets treated as "." */
	49	if (path == NULL \|\| *path == '\0') {
ac8802eb	50	(void)strlcpy(bname, ".", sizeof bname);
b4d02860	51	return(bname);
	52	}
	53
	54	/* Strip trailing slashes */
	55	endp = path + strlen(path) - 1;
	56	while (endp > path && *endp == '/')
	57	endp--;
	58
	59	/* Find the start of the dir */
	60	while (endp > path && *endp != '/')
	61	endp--;
	62
	63	/* Either the dir is "/" or there are no slashes */
	64	if (endp == path) {
ac8802eb	65	(void)strlcpy(bname, *endp == '/' ? "/" : ".", sizeof bname);
b4d02860	66	return(bname);
	67	} else {
	68	do {
	69	endp--;
	70	} while (endp > path && *endp == '/');
	71	}
	72
1656cbed	73	if (endp - path + 2 > sizeof(bname)) {
b4d02860	74	errno = ENAMETOOLONG;
	75	return(NULL);
	76	}
f11065cb	77	strlcpy(bname, path, endp - path + 2);
b4d02860	78	return(bname);
	79	}
	80	#endif