text: /*
   * Copyright (c) 1988, 1993
   *    The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    This product includes software developed by the University of
   *    California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <string.h>
  #include <stddef.h>
  
  char *
  strtok(s, delim)
      register char *s;
      register const char *delim;
  {
      register char *spanp;
      register int c, sc;
      char *tok;
      static char *last;
  
  
      if (s == NULL && (s = last) == NULL)
          return (NULL);
  
      /*
       * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
       */
  cont:
      c = *s++;
      for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
          if (c == sc)
              goto cont;
      }
  
      if (c == 0) {        /* no non-delimiter characters */
          last = NULL;
          return (NULL);
      }
      tok = s - 1;
  
      /*
       * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
       * Note that delim must have one NUL; we stop if we see that, too.
       */
      for (;;) {
          c = *s++;
          spanp = (char *)delim;
          do {
              if ((sc = *spanp++) == c) {
                  if (c == 0)
                      s = NULL;
                  else
                      s[-1] = 0;
                  last = s;
                  return (tok);
              }
          } while (sc != 0);
      }
      /* NOTREACHED */
  }
  