sys/arch/hpc/stand/libsa/strtok.cpp

   1 /*      $NetBSD: strtok.cpp,v 1.1.2.3 2004/09/21 13:15:59 skrll Exp $   */
   2
   3 /*
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #include <sys/types.h>
  34 #include <stdlib.h>
  35 #include <libsa_string.h>
  36
  37 LIBSA_NAMESPACE_BEGIN
  38 __BEGIN_DECLS
  39 char *
  40 strtok(char *s, const char *delim)
  41 {
  42         const char *spanp;
  43         int c, sc;
  44         char *tok;
  45         static char *last;
  46
  47         if (s == NULL && (s = last) == NULL)
  48                 return (NULL);
  49
  50         /*
  51          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  52          */
  53 cont:
  54         c = *s++;
  55         for (spanp = delim; (sc = *spanp++) != 0;) {
  56                 if (c == sc)
  57                         goto cont;
  58         }
  59
  60         if (c == 0) {           /* no non-delimiter characters */
  61                 last = NULL;
  62                 return (NULL);
  63         }
  64         tok = s - 1;
  65
  66         /*
  67          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  68          * Note that delim must have one NUL; we stop if we see that, too.
  69          */
  70         for (;;) {
  71                 c = *s++;
  72                 spanp = delim;
  73                 do {
  74                         if ((sc = *spanp++) == c) {
  75                                 if (c == 0)
  76                                         s = NULL;
  77                                 else
  78                                         s[-1] = 0;
  79                                 last = s;
  80                                 return (tok);
  81                         }
  82                 } while (sc != 0);
  83         }
  84         /* NOTREACHED */
  85 }
  86 __END_DECLS
  87 LIBSA_NAMESPACE_END