ObjFW  Diff

	if ([string isKindOfClass: [OFString_UTF8 class]] ||
	    [string isKindOfClass: [OFMutableString_UTF8 class]]) {
		if (((OFString_UTF8*)string)->s->isUTF8)
			s->isUTF8 = YES;
	} else
		s->isUTF8 = YES;
}

- (void)appendCharacters: (of_unichar_t*)characters
		  length: (size_t)length
{
	char *tmp;

	tmp = [self allocMemoryWithSize: (length * 4) + 1];
	@try {
		size_t i, j = 0;
		BOOL isUTF8 = NO;

		for (i = 0; i < length; i++) {
			char buffer[4];

			switch (of_string_utf8_encode(characters[i], buffer)) {
			case 1:
				tmp[j++] = buffer[0];
				break;
			case 2:
				isUTF8 = YES;

				memcpy(tmp + j, buffer, 2);
				j += 2;

				break;
			case 3:
				isUTF8 = YES;

				memcpy(tmp + j, buffer, 3);
				j += 3;

				break;
			case 4:
				isUTF8 = YES;

				memcpy(tmp + j, buffer, 4);
				j += 4;

				break;
			default:
				@throw [OFInvalidEncodingException
				    exceptionWithClass: [self class]];
			}
		}

		tmp[j] = '\0';

		s->hashed = NO;
		s->cString = [self resizeMemory: s->cString
					   size: s->cStringLength + j + 1];
		memcpy(s->cString + s->cStringLength, tmp, j + 1);

		s->cStringLength += j;
		s->length += length;

		if (isUTF8)
			s->isUTF8 = YES;
	} @finally {
		[self freeMemory: tmp];
	}
}

- (void)appendFormat: (OFConstantString*)format
	   arguments: (va_list)arguments
{
	char *UTF8String;
	int UTF8StringLength;