adtools/clib2

/*
 * $Id: string_strtok_r.c,v 1.4 2006-01-08 12:04:27 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */

/****************************************************************************/

#ifndef _STRING_HEADERS_H
#include "string_headers.h"
#endif /* _STRING_HEADERS_H */

/****************************************************************************/

char *
strtok_r(char *str, const char *separator_set,char ** state_ptr)
{
    char * result = NULL;
    char * last;
    size_t size;

    assert( separator_set != NULL && state_ptr != NULL );

    #if defined(CHECK_FOR_NULL_POINTERS)
    {
        if(separator_set == NULL || state_ptr == NULL)
        {
            __set_errno(EFAULT);
            goto out;
        }
    }
    #endif /* CHECK_FOR_NULL_POINTERS */

    last = (*state_ptr);

    /* Did we get called before? Restart at the last valid position. */
    if(str == NULL)
    {
        str = last;

        /* However, we may have hit the end of the
           string already. */
        if(str == NULL)
            goto out;
    }

    last = NULL;

    /* Skip the characters which count as
       separators. */
    str += strspn(str, separator_set);
    if((*str) == '\0')
        goto out;

    /* Count the number of characters which aren't
       separators. */
    size = strcspn(str, separator_set);
    if(size == 0)
        goto out;

    /* This is where the search can resume later. */
    last = &str[size];

    /* If we didn't hit the end of the string already,
       skip the separator. */
    if((*last) != '\0')
        last++;

    /* This is the token we found; make sure that
       it looks like a valid string. */
    str[size] = '\0';

    result = str;

 out:

    if(state_ptr != NULL)
        (*state_ptr) = last;

    return(result);
}