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      1 /*-
      2  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
      3  *
      4  * strtok_r, from Berkeley strtok
      5  * Oct 13, 1998 by Wes Peters <wes (at) 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:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notices, this list of conditions and the following disclaimer.
     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.
     18  * 3. 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  * From: @(#)strtok.c	8.1 (Berkeley) 6/4/93
     35  */
     36 
     37 #ifdef HAVE_CONFIG_H
     38 #include "config.h"
     39 #endif
     40 
     41 #include "portability.h"
     42 
     43 char *
     44 pcap_strtok_r(char *s, const char *delim, char **last)
     45 {
     46 	char *spanp, *tok;
     47 	int c, sc;
     48 
     49 	if (s == NULL && (s = *last) == NULL)
     50 		return (NULL);
     51 
     52 	/*
     53 	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
     54 	 */
     55 cont:
     56 	c = *s++;
     57 	for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
     58 		if (c == sc)
     59 			goto cont;
     60 	}
     61 
     62 	if (c == 0) {		/* no non-delimiter characters */
     63 		*last = NULL;
     64 		return (NULL);
     65 	}
     66 	tok = s - 1;
     67 
     68 	/*
     69 	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
     70 	 * Note that delim must have one NUL; we stop if we see that, too.
     71 	 */
     72 	for (;;) {
     73 		c = *s++;
     74 		spanp = (char *)delim;
     75 		do {
     76 			if ((sc = *spanp++) == c) {
     77 				if (c == 0)
     78 					s = NULL;
     79 				else
     80 					s[-1] = '\0';
     81 				*last = s;
     82 				return (tok);
     83 			}
     84 		} while (sc != 0);
     85 	}
     86 	/* NOTREACHED */
     87 }
     88