2.11BSD#431 - /usr/src/lib/libc/string/strtok.c

   1: /*
   2:  * Copyright (c) 1988, 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: #if defined(LIBC_SCCS) && !defined(lint)
  35: static char sccsid[] = "@(#)strtok.c	8.1.1 (2.11BSD) 1996/1/11";
  36: #endif /* LIBC_SCCS and not lint */
  37: 
  38: #include <string.h>
  39: #include <stdio.h>
  40: 
  41: char *
  42: strtok(s, delim)
  43:     register char *s;
  44:     register char *delim;
  45: {
  46:     register char *spanp;
  47:     int c, sc;
  48:     char *tok;
  49:     static char *last;
  50: 
  51: 
  52:     if (s == NULL && (s = last) == NULL)
  53:         return (NULL);
  54: 
  55:     /*
  56: 	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  57: 	 */
  58: cont:
  59:     c = *s++;
  60:     for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
  61:         if (c == sc)
  62:             goto cont;
  63:     }
  64: 
  65:     if (c == 0) {       /* no non-delimiter characters */
  66:         last = NULL;
  67:         return (NULL);
  68:     }
  69:     tok = s - 1;
  70: 
  71:     /*
  72: 	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  73: 	 * Note that delim must have one NUL; we stop if we see that, too.
  74: 	 */
  75:     for (;;) {
  76:         c = *s++;
  77:         spanp = (char *)delim;
  78:         do {
  79:             if ((sc = *spanp++) == c) {
  80:                 if (c == 0)
  81:                     s = NULL;
  82:                 else
  83:                     s[-1] = 0;
  84:                 last = s;
  85:                 return (tok);
  86:             }
  87:         } while (sc != 0);
  88:     }
  89:     /* NOTREACHED */
  90: }

Defined functions

Defined variables