/*
 * roman.c
 *
 * Copyright 2009 CrossWire Bible Society (http://www.crosswire.org)
 *	CrossWire Bible Society
 *	P. O. Box 2528
 *	Tempe, AZ  85280-2528
 *
 * 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 version 2.
 *
 * 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.
 *
 */

#include <stdlib.h>
#include <string.h>
#include <roman.h>

SWORD_NAMESPACE_START

char isroman (const char *str, int maxchars) {
	char *ch = (char*)str;
	for (; *ch && (!maxchars || (ch-str) <= maxchars); ch++)
		if (!strchr("IVXLCDMivxlcdm ", *ch))
			return 0;
	return 1;
}

int from_rom(const char* str) {
	int i, n = strlen(str);
	short * num= (short *) calloc(n, sizeof(short));
	for (i = 0; str[i]; i++) {
		switch(str[i]) {
		case 'i':
		case 'I':
			num[i] = 1;
			break;
		case 'v':
		case 'V':
			num[i] = 5;
			break;
		case 'x':
		case 'X':
			num[i] = 10;
			break;
		case 'l':
		case 'L':
			num[i] = 50;
			break;
		case 'c':
		case 'C':
			num[i] = 100;
			break;
		case 'd':
		case 'D':
			num[i] = 500;
			break;
		case 'm':
		case 'M':
			num[i] = 1000;
			break;
		default:
			num[i] = 0;
		}
	}
	for (i = 1; str[i]; i++) {
		if (num[i] > num[i-1])  {
			num[i] -= num[i-1];
			num[i-1] = 0;
		}
	}
	n = 0;
	for (i = 0; str[i]; i++) {
		n += num[i];
	}
     free(num);
	return n;
}

SWORD_NAMESPACE_END
