/*
 * Copyright (C) 2001  Rob Crittenden (rcrit@greyoak.com)
 * Copyright (C) 2001  Ross Combs (rocombs@cs.nmsu.edu)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#define PREFS_INTERNAL_ACCESS
#include "common/setup_before.h"
#include <stdio.h>
#ifdef HAVE_STDDEF_H
# include <stddef.h>
#else
# ifndef NULL
#  define NULL ((void *)0)
# endif
#endif
#ifdef STDC_HEADERS
# include <stdlib.h>
#else
# ifdef HAVE_MALLOC_H
#  include <malloc.h>
# endif
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
# endif
#endif
#include <ctype.h>
#include "token.h"
#include "common/eventlog.h"
#include "common/setup_after.h"

/*
 * Given a string and an integer pointer skip past pos characters and return
 * the next white-space delimited string, setting pos to the new position.
 */
extern char * next_token(char * ptr, unsigned int * pos)
{
    unsigned int i;
    unsigned int start;
    int          quoted;
    
    if (!ptr || !pos)
	return NULL; 
    
    /* skip leading whitespace */
    for (i=*pos; isspace(ptr[i]); i++);
    
    if (ptr[i]=='\0')
	return NULL; /* if after whitespace, we're done */
    
    if (ptr[i]=='"')
    {
	quoted = 1;
	i++;
    }
    else
	quoted = 0;
    
    start = i;
    for (;;)
    {
	if (ptr[i]=='\0')
	    break;
        if (quoted) /* FIXME: add handling of escape chars so quotes can be in tokens */
	{
	    if (ptr[i]=='"')
		break;
        }
	else
	    if (isspace(ptr[i]))
		break;
	i++;
    }
    
    if (ptr[i]!='\0')
    {
	ptr[i] = '\0'; /* terminate the string */
	*pos = i+1; /* remember the position of the next char */
    }
    else
	*pos = i; /* this was the last token, just remember the NUL */
    
    return &ptr[start];
}