apr_strtok.c

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/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifdef HAVE_STDDEF_H
#include <stddef.h>        /* for NULL */
#endif
 
#include "apr.h"
#include "apr_strings.h"
 
#define APR_WANT_STRFUNC   /* for strchr() */
#include "apr_want.h"
 
APR_DECLARE(char *) apr_strtok(char *str, const char *sep, char **last)
{
    char *token;
 
    if (!str)           /* subsequent call */
        str = *last;    /* start where we left off */
 
    /* skip characters in sep (will terminate at '\0') */
    while (*str && strchr(sep, *str))
        ++str;
 
    if (!*str)          /* no more tokens */
        return NULL;
 
    token = str;
 
    /* skip valid token characters to terminate token and
     * prepare for the next call (will terminate at '\0) 
     */
    *last = token + 1;
    while (**last && !strchr(sep, **last))
        ++*last;
 
    if (**last) {
        **last = '\0';
        ++*last;
    }
 
    return token;
}