100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/* $NetBSD: strtok.c,v 1.10 1999/09/20 04:39:49 lukem Exp $ */
|
|
|
|
/*
|
|
* 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
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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 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 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93";
|
|
#else
|
|
__RCSID("$NetBSD: strtok.c,v 1.10 1999/09/20 04:39:49 lukem Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
char *
|
|
strtok(s, delim)
|
|
char *s;
|
|
const char *delim;
|
|
{
|
|
const char *spanp;
|
|
int c, sc;
|
|
char *tok;
|
|
static char *last;
|
|
|
|
/* s may be NULL */
|
|
_DIAGASSERT(delim != NULL);
|
|
|
|
if (s == NULL && (s = last) == NULL)
|
|
return (NULL);
|
|
|
|
/*
|
|
* Skip (span) leading delimiters (s += strspn(s, delim), sort of).
|
|
*/
|
|
cont:
|
|
c = *s++;
|
|
for (spanp = 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 = delim;
|
|
do {
|
|
if ((sc = *spanp++) == c) {
|
|
if (c == 0)
|
|
s = NULL;
|
|
else
|
|
s[-1] = 0;
|
|
last = s;
|
|
return (tok);
|
|
}
|
|
} while (sc != 0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|