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strtok_r.c

00001 /*
00002  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
00003  *
00004  * strtok_r, from Berkeley strtok
00005  * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
00006  *
00007  * Copyright (c) 1988, 1993
00008  *    The Regents of the University of California.  All rights reserved.
00009  *
00010  * Redistribution and use in source and binary forms, with or without
00011  * modification, are permitted provided that the following conditions
00012  * are met:
00013  *
00014  * 1. Redistributions of source code must retain the above copyright
00015  *    notices, this list of conditions and the following disclaimer.
00016  * 
00017  * 2. Redistributions in binary form must reproduce the above copyright
00018  *    notices, this list of conditions and the following disclaimer in the
00019  *    documentation and/or other materials provided with the distribution.
00020  * 
00021  * 3. All advertising materials mentioning features or use of this software
00022  *    must display the following acknowledgement:
00023  *
00024  *    This product includes software developed by Softweyr LLC, the
00025  *      University of California, Berkeley, and its contributors.
00026  *
00027  * 4. Neither the name of the University nor the names of its contributors
00028  *    may be used to endorse or promote products derived from this software
00029  *    without specific prior written permission.
00030  *
00031  * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
00032  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00033  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
00034  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
00035  * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00036  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00037  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00038  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00039  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00040  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00041  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00042  */
00043 
00044 #include "libu_conf.h"
00045 
00046 #ifndef HAVE_STRTOK_R
00047 #include <stddef.h>
00048 #include <string.h>
00049 
00050 char *
00051 strtok_r(char *s, const char *delim, char **last)
00052 {
00053     char *spanp;
00054     int c, sc;
00055     char *tok;
00056 
00057     if (s == NULL && (s = *last) == NULL)
00058     {
00059         return NULL;
00060     }
00061 
00062     /*
00063      * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
00064      */
00065 cont:
00066     c = *s++;
00067     for (spanp = (char *)delim; (sc = *spanp++) != 0; )
00068     {
00069         if (c == sc)
00070         {
00071             goto cont;
00072         }
00073     }
00074 
00075     if (c == 0)        /* no non-delimiter characters */
00076     {
00077         *last = NULL;
00078         return NULL;
00079     }
00080     tok = s - 1;
00081 
00082     /*
00083      * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
00084      * Note that delim must have one NUL; we stop if we see that, too.
00085      */
00086     for (;;)
00087     {
00088         c = *s++;
00089         spanp = (char *)delim;
00090         do
00091         {
00092             if ((sc = *spanp++) == c)
00093             {
00094                 if (c == 0)
00095                 {
00096                     s = NULL;
00097                 }
00098                 else
00099                 {
00100                     char *w = s - 1;
00101                     *w = '\0';
00102                 }
00103                 *last = s;
00104                 return tok;
00105             }
00106         }
00107         while (sc != 0);
00108     }
00109     /* NOTREACHED */
00110 }
00111 
00112 #else
00113 char *strtok_r(char *s, const char *delim, char **last);
00114 #endif 

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