The Tcpdump Group git mirrors - libpcap/blob - missing/strtok_r.c

   1 /*-
   2  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
   3  *
   4  * strtok_r, from Berkeley strtok
   5  * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
   6  *
   7  * Copyright (c) 1988, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notices, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notices, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  25  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
  26  * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  28  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  29  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * From: @(#)strtok.c   8.1 (Berkeley) 6/4/93
  35  */
  36
  37 #ifdef HAVE_CONFIG_H
  38 #include <config.h>
  39 #endif
  40
  41 #include "portability.h"
  42
  43 char *
  44 pcap_strtok_r(char *s, const char *delim, char **last)
  45 {
  46         char *spanp, *tok;
  47         int c, sc;
  48
  49         if (s == NULL && (s = *last) == NULL)
  50                 return (NULL);
  51
  52         /*
  53          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
  54          */
  55 cont:
  56         c = *s++;
  57         for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
  58                 if (c == sc)
  59                         goto cont;
  60         }
  61
  62         if (c == 0) {           /* no non-delimiter characters */
  63                 *last = NULL;
  64                 return (NULL);
  65         }
  66         tok = s - 1;
  67
  68         /*
  69          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
  70          * Note that delim must have one NUL; we stop if we see that, too.
  71          */
  72         for (;;) {
  73                 c = *s++;
  74                 spanp = (char *)delim;
  75                 do {
  76                         if ((sc = *spanp++) == c) {
  77                                 if (c == 0)
  78                                         s = NULL;
  79                                 else
  80                                         s[-1] = '\0';
  81                                 *last = s;
  82                                 return (tok);
  83                         }
  84                 } while (sc != 0);
  85         }
  86         /* NOTREACHED */
  87 }