/*
	Strip out anything in the string that is not a digit
	Original Source: <http://cocoa.karelia.com/Foundation_Categories/NSString/Strip_out_anything_.m>
	(See copyright notice at <http://cocoa.karelia.com>)
*/

/*"	Return a string consisting only of the digits in the string.  For example, (916) 692-1560 is converted to 9166921560.
"*/

- (NSString *)digitsOnly
{
	NSString *result = nil;
	unsigned len = [self length];
	unichar *buffer = malloc(len * sizeof(unichar));
	NSCharacterSet *decimalDigits = [NSCharacterSet decimalDigitCharacterSet];
	unsigned i;
	unsigned j = 0;
	for ( i = 0 ; i < len ; i++ )
	{
		unichar c = [self characterAtIndex:i];
		if ([decimalDigits characterIsMember:c])
		{
			buffer[j++] = c;
		}
	}
	result = [[[NSString alloc] initWithCharacters:buffer length:j] autorelease];
	free(buffer);
	return result;
}