xref: /freebsd-11.0-release/lib/libc/gen/dirname.c

/*
 * 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.
 */

#if 0
#ifndef lint
static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/lib/libc/gen/dirname.c 108152 2002-12-21 07:12:35Z bbraun $");

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

char *
dirname(path)
	const char *path;
{
	static char *bname = NULL;
	const char *endp;

	if (bname == NULL) {
		bname = (char *)malloc(MAXPATHLEN);
		if (bname == NULL)
			return(NULL);
	}

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		(void)strcpy(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)strcpy(bname, *endp == '/' ? "/" : ".");
		return(bname);
	} else {
		do {
			endp--;
		} while (endp > path && *endp == '/');
	}

	if (endp - path + 2 > MAXPATHLEN) {
		errno = ENAMETOOLONG;
		return(NULL);
	}
	(void)strncpy(bname, path, endp - path + 1);
	bname[endp - path + 1] = '\0';
	return(bname);
}