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      1 /*-
      2  * Copyright (c) 1990, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #include "config.h"
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 static const char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";
     38 #endif /* LIBC_SCCS and not lint */
     39 #else
     40 __RCSID("$NetBSD: strsep.c,v 1.2 2014/01/26 21:43:45 christos Exp $");
     41 #endif
     42 
     43 #include <string.h>
     44 #include <stdio.h>
     45 
     46 /*
     47  * Get next token from string *stringp, where tokens are possibly-empty
     48  * strings separated by characters from delim.
     49  *
     50  * Writes NULs into the string at *stringp to end tokens.
     51  * delim need not remain constant from call to call.
     52  * On return, *stringp points past the last NUL written (if there might
     53  * be further tokens), or is NULL (if there are definitely no more tokens).
     54  *
     55  * If *stringp is NULL, strsep returns NULL.
     56  *
     57  * PUBLIC: #ifndef HAVE_STRSEP
     58  * PUBLIC: char *strsep __P((char **, const char *));
     59  * PUBLIC: #endif
     60  */
     61 char *
     62 strsep(register char **stringp, register const char *delim)
     63 {
     64 	register char *s;
     65 	register const char *spanp;
     66 	register int c, sc;
     67 	char *tok;
     68 
     69 	if ((s = *stringp) == NULL)
     70 		return (NULL);
     71 	for (tok = s;;) {
     72 		c = *s++;
     73 		spanp = delim;
     74 		do {
     75 			if ((sc = *spanp++) == c) {
     76 				if (c == 0)
     77 					s = NULL;
     78 				else
     79 					s[-1] = 0;
     80 				*stringp = s;
     81 				return (tok);
     82 			}
     83 		} while (sc != 0);
     84 	}
     85 	/* NOTREACHED */
     86 }
     87