/* ==== parse.c ============================================================
 * Copyright (c) 1995 by Chris Provenzano, proven@mit.edu
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by Chris Provenzano.
 * 4. The name of Chris Provenzano may not be used to endorse or promote 
 *	  products derived from this software without specific prior written
 *	  permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO 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.
 *
 * Description : Main fc functions.
 *
 *  1.00 95/06/28  proven
 *      -Started coding this file.
 */

#include <stdio.h>
#include <errno.h>
#include "util.h"
#include "parse.h"

/* Special keys */
char * special_keys[] = { ".", "..", "...", NULL };

/* ==========================================================================
 * parse_key_is_special() 
 */
int parse_key_is_special(char * key) 
{
	int i;
	
	for (i = 0; special_keys[i]; i++) {
		if (!strcmp(key, special_keys[i])) {
			return(i + 1);
		}
	}
	return(OK);
}

/* ==========================================================================
 * parse_skip_space()
 */
char * parse_skip_space(char * data)
{                                                                           
    char * end_space;                                                       
                                                                            
    for(end_space = data; *end_space && isspace(*end_space); end_space++);  
    return((*end_space) ? end_space : NULL);
}   

/* ==========================================================================
 * parse_for_key()
 *
 * Not valid chars are [: \t\n\0] and non printable characters.
 */
char * parse_get_key(char * data, char ** data_end)
{
	char * key = NULL;
	int i = 0;

	if (data && (data = parse_skip_space(data))) {
		if (!isalnum(data[i])) {
			if (!isprint(data[i])) {
				return(NULL);
			}
			switch(data[i]) {
			case ':':
				return(NULL);
				break;
			default:
				break;
			}
		}
		/* Have a valid first character */
		while(data[++i]) {
			if (!isalnum(data[i])) {
				if (!isprint(data[i])) {
					if (data_end) {
						*data_end = data + i + 1;
					}
					data[i] = '\0';
					return(data);
				}
				switch(data[i]) {
				case '\t':
				case '\n':
				case ' ':
				case ':':
					if (data_end) {
						*data_end = data + i + 1;
					}
					data[i] = '\0';
					return(data);
					break;
				default:
					break;
				}
			}
		}
	}
	if (data_end) {
		*data_end = NULL;
	}
	return(data);
}