ObjFW  Diff

		buf[i] = 0x80 | (c & 0x3F);
		return 4;
	}

	return 0;
}

of_unichar_t
of_string_utf8_to_unicode(const char *buf_, size_t len)
size_t
of_string_utf8_to_unicode(const char *buf_, size_t len, of_unichar_t *ret)
{
	const uint8_t *buf = (const uint8_t*)buf_;

	if (!(*buf & 0x80))
		return buf[0];
	if (!(*buf & 0x80)) {
		*ret = buf[0];
		return 1;
	}

	if ((*buf & 0xE0) == 0xC0) {
		if (OF_UNLIKELY(len < 2))
			return OF_INVALID_UNICHAR;
			return 0;

		return ((buf[0] & 0x1F) << 6) | (buf[1] & 0x3F);
		*ret = ((buf[0] & 0x1F) << 6) | (buf[1] & 0x3F);
		return 2;
	}

	if ((*buf & 0xF0) == 0xE0) {
		if (OF_UNLIKELY(len < 3))
			return OF_INVALID_UNICHAR;
			return 0;

		return ((buf[0] & 0x0F) << 12) | ((buf[1] & 0x3F) << 6) |
		*ret = ((buf[0] & 0x0F) << 12) | ((buf[1] & 0x3F) << 6) |
		    (buf[2] & 0x3F);
		return 3;
	}

	if ((*buf & 0xF8) == 0xF0) {
		if (OF_UNLIKELY(len < 4))
			return OF_INVALID_UNICHAR;
			return 0;

		return ((buf[0] & 0x07) << 18) | ((buf[1] & 0x3F) << 12) |
		*ret = ((buf[0] & 0x07) << 18) | ((buf[1] & 0x3F) << 12) |
		    ((buf[2] & 0x3F) << 6) | (buf[3] & 0x3F);
		return 4;
	}

	return OF_INVALID_UNICHAR;
	return 0;
}

size_t
of_string_position_to_index(const char *str, size_t pos)
{
	size_t i, idx = pos;

	of_unichar_t c;

	index = of_string_index_to_position(string, index, length);

	if (index >= length)
		@throw [OFOutOfRangeException newWithClass: isa];

	if ((c = of_string_utf8_to_unicode(string + index, length - index)) ==
	if (!of_string_utf8_to_unicode(string + index, length - index, &c))
	    OF_INVALID_UNICHAR)
		@throw [OFInvalidEncodingException newWithClass: isa];

	return c;
}

- (size_t)indexOfFirstOccurrenceOfString: (OFString*)str
{