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      1 /*
      2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*	$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $	*/
      7 
      8 /*
      9  * Copyright (c) 1990, 1993
     10  *	The Regents of the University of California.  All rights reserved.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  */
     40 
     41 #include "lint.h"
     42 #include <string.h>
     43 #include <stdio.h>
     44 
     45 #if defined(LIBC_SCCS) && !defined(lint)
     46 #if 0
     47 static char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";
     48 #else
     49 static char *rcsid =
     50 	"$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $";
     51 #endif
     52 #endif /* LIBC_SCCS and not lint */
     53 
     54 /*
     55  * Get next token from string *stringp, where tokens are possibly-empty
     56  * strings separated by characters from delim.
     57  *
     58  * Writes NULs into the string at *stringp to end tokens.
     59  * delim need not remain constant from call to call.
     60  * On return, *stringp points past the last NUL written (if there might
     61  * be further tokens), or is NULL (if there are definitely no more tokens).
     62  *
     63  * If *stringp is NULL, strsep returns NULL.
     64  */
     65 char *
     66 strsep(char **stringp, const char *delim)
     67 {
     68 	register char *s;
     69 	register const char *spanp;
     70 	register int c, sc;
     71 	char *tok;
     72 
     73 	if ((s = *stringp) == NULL)
     74 		return (NULL);
     75 	for (tok = s; ; ) {
     76 		c = *s++;
     77 		spanp = delim;
     78 		do {
     79 			if ((sc = *spanp++) == c) {
     80 				if (c == 0)
     81 					s = NULL;
     82 				else
     83 					s[-1] = 0;
     84 				*stringp = s;
     85 				return (tok);
     86 			}
     87 		} while (sc != 0);
     88 	}
     89 	/* NOTREACHED */
     90 }
     91