[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>

char *
dirname_r(const char *path, char *dname)
{
	const char *endp;
	size_t len;

	/* 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);
}

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

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

	if (dname == NULL) {
		dname = (char *)malloc(MAXPATHLEN);
		if (dname == NULL)
			return (NULL);
	}
	return (dirname_r(path, 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 A	27
5b2abdfb A	28	char *
974e3884	29	dirname_r(const char path, char dname)
5b2abdfb	30	{
9385eb3d	31	const char *endp;
974e3884	32	size_t len;
5b2abdfb A	33
	34	/* Empty or NULL string gets treated as "." */
	35	if (path == NULL \|\| *path == '\0') {
1f2f436a A	36	dname[0] = '.';
	37	dname[1] = '\0';
	38	return (dname);
5b2abdfb A	39	}
5b2abdfb A	40
1f2f436a	41	/* Strip any trailing slashes */
5b2abdfb A	42	endp = path + strlen(path) - 1;
	43	while (endp > path && *endp == '/')
	44	endp--;
	45
	46	/* Find the start of the dir */
	47	while (endp > path && *endp != '/')
	48	endp--;
	49
	50	/* Either the dir is "/" or there are no slashes */
	51	if (endp == path) {
1f2f436a A	52	dname[0] = *endp == '/' ? '/' : '.';
	53	dname[1] = '\0';
	54	return (dname);
5b2abdfb	55	} else {
1f2f436a	56	/* Move forward past the separating slashes */
5b2abdfb A	57	do {
	58	endp--;
	59	} while (endp > path && *endp == '/');
	60	}
	61
1f2f436a A	62	len = endp - path + 1;
1f2f436a A	63	if (len >= MAXPATHLEN) {
5b2abdfb	64	errno = ENAMETOOLONG;
1f2f436a	65	return (NULL);
5b2abdfb	66	}
1f2f436a A	67	memcpy(dname, path, len);
	68	dname[len] = '\0';
	69	return (dname);
5b2abdfb	70	}
974e3884 A	71
	72	#if __DARWIN_UNIX03
	73	#define const /**/
	74	#endif
	75
	76	char *
	77	dirname(const char *path)
	78	{
	79	static char *dname = NULL;
	80
	81	if (dname == NULL) {
	82	dname = (char *)malloc(MAXPATHLEN);
	83	if (dname == NULL)
	84	return (NULL);
	85	}
	86	return (dirname_r(path, dname));
	87	}