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  1. /*
  2.  * Copyright (c) 1988 Regents of the University of California.
  3.  * 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. Neither the name of the University nor the names of its contributors
  14.  *    may be used to endorse or promote products derived from this software
  15.  *    without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27.  * SUCH DAMAGE.
  28.  */
  29.  
  30. #include <string.h>
  31.  
  32. char *
  33. _DEFUN (__strtok_r, (s, delim, lasts, skip_leading_delim),
  34.         register char *s _AND
  35.         register const char *delim _AND
  36.         char **lasts _AND
  37.         int skip_leading_delim)
  38. {
  39.         register char *spanp;
  40.         register int c, sc;
  41.         char *tok;
  42.  
  43.  
  44.         if (s == NULL && (s = *lasts) == NULL)
  45.                 return (NULL);
  46.  
  47.         /*
  48.          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  49.          */
  50. cont:
  51.         c = *s++;
  52.         for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
  53.                 if (c == sc) {
  54.                         if (skip_leading_delim) {
  55.                                 goto cont;
  56.                         }
  57.                         else {
  58.                                 *lasts = s;
  59.                                 s[-1] = 0;
  60.                                 return (s - 1);
  61.                         }
  62.                 }
  63.         }
  64.  
  65.         if (c == 0) {           /* no non-delimiter characters */
  66.                 *lasts = 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.                                 *lasts = s;
  85.                                 return (tok);
  86.                         }
  87.                 } while (sc != 0);
  88.         }
  89.         /* NOTREACHED */
  90. }
  91.  
  92. char *
  93. _DEFUN (strtok_r, (s, delim, lasts),
  94.         register char *s _AND
  95.         register const char *delim _AND
  96.         char **lasts)
  97. {
  98.         return __strtok_r (s, delim, lasts, 1);
  99. }
  100.