/* ====================================================================
 * Copyright (c) 1999-2001 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
 * ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY
 * NOR ITS EMPLOYEES 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.
 *
 * ====================================================================
 *
 */
/*
 * str2words.c -- Convert a string to an array of words
 * HISTORY
 * 
 * 21-Oct-95	M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University.
 * 		Created.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <ctype.h>

#include "s2types.h"
#include "str2words.h"
#include "err.h"

int32 str2words (char *line, char **ptr, int32 max_ptr)
{
    int32 i, n;
    
    n = 0;	/* #words found so far */
    i = 0;	/* For scanning through the input string */
    for (;;) {
	/* Skip whitespace before next word */
	for (; line[i] && (isspace(line[i])); i++);
	if (! line[i])
	    break;
	
	if (n >= max_ptr) {
	    /*
	     * Pointer array size insufficient.  Restore NULL chars inserted so far
	     * to space chars.  Not a perfect restoration, but better than nothing.
	     */
	    for (; i >= 0; --i)
		if (line[i] == '\0')
		    line[i] = ' ';
	    
	    return -1;
	}
	
	/* Scan to end of word */
	ptr[n++] = line+i;
	for (; line[i] && (! isspace(line[i])); i++);
	if (! line[i])
	    break;
	line[i++] = '\0';
    }
    
    return n;
}