[apple/libc.git] / gen / FreeBSD / dirname.c

/*	$OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $	*/

/*
 * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/dirname.c,v 1.8 2008/11/03 05:19:45 delphij Exp $");

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

#if __DARWIN_UNIX03
#define const /**/
#endif

char *
dirname(const char *path)
{
	static char *dname = NULL;
	size_t len;
	const char *endp;

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

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		dname[0] = '.';
		dname[1] = '\0';
		return (dname);
	}

	/* Strip any 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) {
		dname[0] = *endp == '/' ? '/' : '.';
		dname[1] = '\0';
		return (dname);
	} else {
		/* Move forward past the separating slashes */
		do {
			endp--;
		} while (endp > path && *endp == '/');
	}

	len = endp - path + 1;
	if (len >= MAXPATHLEN) {
		errno = ENAMETOOLONG;
		return (NULL);
	}
	memcpy(dname, path, len);
	dname[len] = '\0';
	return (dname);
}
Commit	Line	Data
1f2f436a A	1	/* $OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $ */
1f2f436a A	2
5b2abdfb	3	/*
1f2f436a	4	* Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
5b2abdfb	5	*
1f2f436a A	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
5b2abdfb	9	*
1f2f436a A	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
5b2abdfb A	17	*/
5b2abdfb A	18
9385eb3d	19	#include <sys/cdefs.h>
1f2f436a	20	__FBSDID("$FreeBSD: src/lib/libc/gen/dirname.c,v 1.8 2008/11/03 05:19:45 delphij Exp $");
5b2abdfb A	21
	22	#include <errno.h>
	23	#include <libgen.h>
9385eb3d	24	#include <stdlib.h>
5b2abdfb A	25	#include <string.h>
5b2abdfb A	26	#include <sys/param.h>
5b2abdfb	27
ad3c9f2a A	28	#if __DARWIN_UNIX03
	29	#define const /**/
	30	#endif
	31
5b2abdfb	32	char *
1f2f436a	33	dirname(const char *path)
5b2abdfb	34	{
1f2f436a A	35	static char *dname = NULL;
1f2f436a A	36	size_t len;
9385eb3d	37	const char *endp;
5b2abdfb	38
1f2f436a A	39	if (dname == NULL) {
	40	dname = (char *)malloc(MAXPATHLEN);
	41	if (dname == NULL)
9385eb3d	42	return(NULL);
5b2abdfb A	43	}
	44
	45	/* Empty or NULL string gets treated as "." */
	46	if (path == NULL \|\| *path == '\0') {
1f2f436a A	47	dname[0] = '.';
	48	dname[1] = '\0';
	49	return (dname);
5b2abdfb A	50	}
5b2abdfb A	51
1f2f436a	52	/* Strip any trailing slashes */
5b2abdfb A	53	endp = path + strlen(path) - 1;
	54	while (endp > path && *endp == '/')
	55	endp--;
	56
	57	/* Find the start of the dir */
	58	while (endp > path && *endp != '/')
	59	endp--;
	60
	61	/* Either the dir is "/" or there are no slashes */
	62	if (endp == path) {
1f2f436a A	63	dname[0] = *endp == '/' ? '/' : '.';
	64	dname[1] = '\0';
	65	return (dname);
5b2abdfb	66	} else {
1f2f436a	67	/* Move forward past the separating slashes */
5b2abdfb A	68	do {
	69	endp--;
	70	} while (endp > path && *endp == '/');
	71	}
	72
1f2f436a A	73	len = endp - path + 1;
1f2f436a A	74	if (len >= MAXPATHLEN) {
5b2abdfb	75	errno = ENAMETOOLONG;
1f2f436a	76	return (NULL);
5b2abdfb	77	}
1f2f436a A	78	memcpy(dname, path, len);
	79	dname[len] = '\0';
	80	return (dname);
5b2abdfb	81	}