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/* ========================================================================
* Copyright 1988-2007 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: String return successive tokens
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
*
* Date: 11 May 1989
* Last Edited: 30 January 2007
*/
/* Find token in string
* Accepts: source pointer or NIL to use previous source
* vector of token delimiters pointer
* Returns: pointer to next token
*/
static char *state = NIL; /* string to locate tokens */
char *strtok (char *s,char *ct)
{
return strtok_r (s,ct,&state);/* jacket into reentrant routine */
}
/* Find token in string (reentrant)
* Accepts: source pointer or NIL to use previous source
* vector of token delimiters pointer
* returned state pointer
* Returns: pointer to next token
*/
char *strtok_r (char *s,char *ct,char **r)
{
char *t,*ts;
if (!s) s = *r; /* use previous token if none specified */
*r = NIL; /* default to no returned state */
if (!(s && *s)) return NIL; /* no tokens left */
/* find any leading delimiters */
do for (t = ct, ts = NIL; *t; t++) if (*t == *s) {
if (*(ts = ++s)) break; /* yes, restart search if more in string */
return NIL; /* else no more tokens */
} while (ts); /* continue until no more leading delimiters */
/* can we find a new delimiter? */
for (ts = s; *ts; ts++) for (t = ct; *t; t++) if (*t == *ts) {
*ts++ = '\0'; /* yes, tie off token at that point */
*r = ts; /* save subsequent tokens for future call */
return s; /* return our token */
}
return s; /* return final token */
}
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