strtok.c
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- /*
- * 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: 12 September 1994
- *
- * Copyright 1994 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appears in all copies and that both the
- * above copyright notice and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made
- * available "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
- /* 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 *ts = NIL; /* string to locate tokens */
- char *strtok (char *s,char *ct)
- {
- char *t;
- if (!s) s = ts; /* use previous token if none specified */
- if (!(s && *s)) return NIL; /* no tokens */
- /* find any leading delimiters */
- do for (t = ct, ts = NIL; *t; t++) if (*t == *s) {
- if (*(ts = ++s)) break; /* yes, restart seach if more in string */
- return ts = 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++ = ' '; /* yes, tie off token at that point */
- return s; /* return our token */
- }
- ts = NIL; /* no more tokens */
- return s; /* return final token */
- }