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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 #include  <LibConfig.h>
     34 
     35 #include <sys/cdefs.h>
     36 #include <string.h>
     37 #include <stdio.h>
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 static char sccsid[] = "@(#)strsep.c  8.1 (Berkeley) 6/4/93";
     41 #endif /* LIBC_SCCS and not lint */
     42 
     43 /*
     44  * Get next token from string *stringp, where tokens are possibly-empty
     45  * strings separated by characters from delim.
     46  *
     47  * Writes NULs into the string at *stringp to end tokens.
     48  * delim need not remain constant from call to call.
     49  * On return, *stringp points past the last NUL written (if there might
     50  * be further tokens), or is NULL (if there are definitely no more tokens).
     51  *
     52  * If *stringp is NULL, strsep returns NULL.
     53  */
     54 char *
     55 strsep(
     56   register char **stringp,
     57   register const char *delim
     58   )
     59 {
     60   register char *s;
     61   register const char *spanp;
     62   register int c, sc;
     63   char *tok;
     64 
     65   if ((s = *stringp) == NULL)
     66     return (NULL);
     67   for (tok = s;;) {
     68     c = *s++;
     69     spanp = delim;
     70     do {
     71       if ((sc = *spanp++) == c) {
     72         if (c == 0)
     73           s = NULL;
     74         else
     75           s[-1] = 0;
     76         *stringp = s;
     77         return (tok);
     78       }
     79     } while (sc != 0);
     80   }
     81   /* NOTREACHED */
     82 }
     83