Method utf16

core/string/ustring.cpp:2155–2206

}

Char16String String::utf16() const {
	int l = length();
	if (!l) {
		return Char16String();
	}

	const char32_t *d = &operator[](0);
	int fl = 0;
	for (int i = 0; i < l; i++) {
		uint32_t c = d[i];
		if (c <= 0xffff) { // 16 bits.
			fl += 1;
			if ((c & 0xfffff800) == 0xd800) {
				print_unicode_error(vformat("Unpaired surrogate (%x)", c));
			}
		} else if (c <= 0x10ffff) { // 32 bits.
			fl += 2;
		} else {
			print_unicode_error(vformat("Invalid unicode codepoint (%x), cannot represent as UTF-16", c), true);
			fl += 1;
		}
	}

	Char16String utf16s;
	if (fl == 0) {
		return utf16s;
	}

	utf16s.resize_uninitialized(fl + 1);
	uint16_t *cdst = (uint16_t *)utf16s.get_data();

#define APPEND_CHAR(m_c) *(cdst++) = m_c

	for (int i = 0; i < l; i++) {
		uint32_t c = d[i];

		if (c <= 0xffff) { // 16 bits.
			APPEND_CHAR(c);
		} else if (c <= 0x10ffff) { // 32 bits.
			APPEND_CHAR(uint32_t((c >> 10) + 0xd7c0)); // lead surrogate.
			APPEND_CHAR(uint32_t((c & 0x3ff) | 0xdc00)); // trail surrogate.
		} else {
			// the string is a valid UTF32, so it should never happen ...
			APPEND_CHAR(uint32_t((_replacement_char >> 10) + 0xd7c0));
			APPEND_CHAR(uint32_t((_replacement_char & 0x3ff) | 0xdc00));
		}
	}
#undef APPEND_CHAR
	*cdst = 0; //trailing zero

	return utf16s;
}

int64_t String::hex_to_int() const {
	int len = length();