[apple/libc.git] / string / FreeBSD / strtok.c

/*-
 * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
 *
 * strtok_r, from Berkeley strtok
 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
 *
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  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
 *    notices, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notices, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
 * ``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 SOFTWEYR LLC, THE
 * REGENTS, OR CONTRIBUTORS 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 defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strtok.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/string/strtok.c,v 1.10 2007/12/12 18:33:06 wes Exp $");

#include <stddef.h>
#ifdef DEBUG_STRTOK
#include <stdio.h>
#endif
#include <string.h>

char	*__strtok_r(char *, const char *, char **);

__weak_reference(__strtok_r, strtok_r);

char *
__strtok_r(char *s, const char *delim, char **last)
{
	char *spanp, *tok;
	int c, sc;

	if (s == NULL && (s = *last) == NULL)
		return (NULL);

	/*
	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
	 */
cont:
	c = *s++;
	for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
		if (c == sc)
			goto cont;
	}

	if (c == 0) {		/* no non-delimiter characters */
		*last = NULL;
		return (NULL);
	}
	tok = s - 1;

	/*
	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
	 * Note that delim must have one NUL; we stop if we see that, too.
	 */
	for (;;) {
		c = *s++;
		spanp = (char *)delim;
		do {
			if ((sc = *spanp++) == c) {
				if (c == 0)
					s = NULL;
				else
					s[-1] = '\0';
				*last = s;
				return (tok);
			}
		} while (sc != 0);
	}
	/* NOTREACHED */
}

char *
strtok(char *s, const char *delim)
{
	static char *last;

	return (__strtok_r(s, delim, &last));
}

#ifdef DEBUG_STRTOK
/*
 * Test the tokenizer.
 */
int
main(void)
{
	char blah[80], test[80];
	char *brkb, *brkt, *phrase, *sep, *word;

	sep = "\\/:;=-";
	phrase = "foo";

	printf("String tokenizer test:\n");
	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
	for (word = strtok(test, sep); word; word = strtok(NULL, sep))
		printf("Next word is \"%s\".\n", word);
	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");

	for (word = strtok_r(test, sep, &brkt); word;
	    word = strtok_r(NULL, sep, &brkt)) {
		strcpy(blah, "blah:blat:blab:blag");

		for (phrase = strtok_r(blah, sep, &brkb); phrase;
		    phrase = strtok_r(NULL, sep, &brkb))
			printf("So far we're at %s:%s\n", word, phrase);
	}

	return (0);
}

#endif /* DEBUG_STRTOK */
Commit	Line	Data
9385eb3d	1	/*-
5b2abdfb A	2	* Copyright (c) 1998 Softweyr LLC. All rights reserved.
	3	*
	4	* strtok_r, from Berkeley strtok
	5	* Oct 13, 1998 by Wes Peters <wes@softweyr.com>
	6	*
	7	* Copyright (c) 1988, 1993
	8	* The Regents of the University of California. All rights reserved.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
5b2abdfb A	13	* 1. Redistributions of source code must retain the above copyright
5b2abdfb A	14	* notices, this list of conditions and the following disclaimer.
5b2abdfb A	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notices, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
5b2abdfb A	18	* 4. Neither the name of the University nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
	23	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	24	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	25	* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
	26	* REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	27	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
	28	* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	29	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
	34
9385eb3d A	35	#if defined(LIBC_SCCS) && !defined(lint)
	36	static char sccsid[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93";
	37	#endif /* LIBC_SCCS and not lint */
	38	#include <sys/cdefs.h>
1f2f436a	39	__FBSDID("$FreeBSD: src/lib/libc/string/strtok.c,v 1.10 2007/12/12 18:33:06 wes Exp $");
5b2abdfb A	40
5b2abdfb A	41	#include <stddef.h>
9385eb3d A	42	#ifdef DEBUG_STRTOK
	43	#include <stdio.h>
	44	#endif
5b2abdfb A	45	#include <string.h>
5b2abdfb A	46
9385eb3d A	47	char __strtok_r(char , const char , char *);
	48
	49	__weak_reference(__strtok_r, strtok_r);
	50
5b2abdfb	51	char *
9385eb3d	52	__strtok_r(char s, const char delim, char **last)
5b2abdfb	53	{
9385eb3d A	54	char spanp, tok;
	55	int c, sc;
	56
	57	if (s == NULL && (s = *last) == NULL)
	58	return (NULL);
	59
	60	/*
	61	* Skip (span) leading delimiters (s += strspn(s, delim), sort of).
	62	*/
5b2abdfb	63	cont:
5b2abdfb	64	c = *s++;
9385eb3d A	65	for (spanp = (char )delim; (sc = spanp++) != 0;) {
	66	if (c == sc)
	67	goto cont;
5b2abdfb	68	}
5b2abdfb	69
9385eb3d A	70	if (c == 0) { /* no non-delimiter characters */
	71	*last = NULL;
	72	return (NULL);
	73	}
	74	tok = s - 1;
	75
	76	/*
	77	* Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
	78	* Note that delim must have one NUL; we stop if we see that, too.
	79	*/
	80	for (;;) {
	81	c = *s++;
	82	spanp = (char *)delim;
	83	do {
	84	if ((sc = *spanp++) == c) {
	85	if (c == 0)
	86	s = NULL;
	87	else
	88	s[-1] = '\0';
	89	*last = s;
	90	return (tok);
	91	}
	92	} while (sc != 0);
	93	}
	94	/* NOTREACHED */
	95	}
5b2abdfb A	96
	97	char *
	98	strtok(char s, const char delim)
	99	{
9385eb3d	100	static char *last;
5b2abdfb	101
9385eb3d	102	return (__strtok_r(s, delim, &last));
5b2abdfb A	103	}
5b2abdfb A	104
9385eb3d	105	#ifdef DEBUG_STRTOK
5b2abdfb A	106	/*
	107	* Test the tokenizer.
	108	*/
	109	int
9385eb3d	110	main(void)
5b2abdfb	111	{
9385eb3d A	112	char blah[80], test[80];
9385eb3d A	113	char brkb, brkt, phrase, sep, *word;
5b2abdfb	114
9385eb3d A	115	sep = "\\/:;=-";
9385eb3d A	116	phrase = "foo";
5b2abdfb	117
9385eb3d A	118	printf("String tokenizer test:\n");
	119	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
	120	for (word = strtok(test, sep); word; word = strtok(NULL, sep))
	121	printf("Next word is \"%s\".\n", word);
	122	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
5b2abdfb	123
9385eb3d A	124	for (word = strtok_r(test, sep, &brkt); word;
	125	word = strtok_r(NULL, sep, &brkt)) {
	126	strcpy(blah, "blah:blat:blab:blag");
5b2abdfb	127
9385eb3d A	128	for (phrase = strtok_r(blah, sep, &brkb); phrase;
	129	phrase = strtok_r(NULL, sep, &brkb))
	130	printf("So far we're at %s:%s\n", word, phrase);
5b2abdfb	131	}
5b2abdfb	132
9385eb3d	133	return (0);
5b2abdfb A	134	}
	135
	136	#endif /* DEBUG_STRTOK */