ObjFW  Diff

 * For example, on Windows XP, when using Windows XP's console, changing the
 * codepage to UTF-8 mostly breaks write() and completely breaks read():
 * write() suddenly returns the number of characters - instead of bytes -
 * written and read() just returns 0 as soon as a Unicode character is being
 * read.
 *
 * Therefore, instead of just using the UTF-8 codepage, this captures all reads
 * and writes to of_std{in,out,err} on the low level, interprets the buffer as
 * UTF-8 and converts to / from UTF-16 to use ReadConsoleW() / WriteConsoleW().
 * Doing so is safe, as the console only supports text anyway and thus it does
 * not matter if binary gets garbled by the conversion (e.g. because invalid
 * UTF-8 gets converted to U+FFFD).
 *
 * In order to not do this when redirecting input / output to a file (as the
 * file would then be read / written in the wrong encoding and break reading /

{
	int fd;

	if (self != [OFWin32ConsoleStdIOStream class])
		return;

	if ((fd = _fileno(stdin)) >= 0)
		of_stdin = [[OFWin32ConsoleStdIOStream alloc]
		    of_initWithFileDescriptor: fd];
	if ((fd = _fileno(stdout)) >= 0)
		of_stdout = [[OFWin32ConsoleStdIOStream alloc]
		    of_initWithFileDescriptor: fd];
	if ((fd = _fileno(stderr)) >= 0)
		of_stderr = [[OFWin32ConsoleStdIOStream alloc]
		    of_initWithFileDescriptor: fd];
}

- (instancetype)of_initWithFileDescriptor: (int)fd
{
	self = [super of_initWithFileDescriptor: fd];

		if (UTF16Len > 0 && _incompleteUTF16Surrogate != 0) {
			OFUnichar c =
			    (((_incompleteUTF16Surrogate & 0x3FF) << 10) |
			    (UTF16[0] & 0x3FF)) + 0x10000;
			char UTF8[4];
			size_t UTF8Len;

			if ((UTF8Len = of_string_utf8_encode(c, UTF8)) == 0)
				@throw [OFInvalidEncodingException exception];

			if (UTF8Len <= length) {
				memcpy(buffer, UTF8, UTF8Len);
				j += UTF8Len;
			} else {
				if (rest == nil)

				c = (((c & 0x3FF) << 10) | (next & 0x3FF)) +
				    0x10000;

				i++;
			}

			if ((UTF8Len = of_string_utf8_encode(c, UTF8)) == 0)
				@throw [OFInvalidEncodingException exception];

			if (j + UTF8Len <= length) {
				memcpy(buffer + j, UTF8, UTF8Len);
				j += UTF8Len;
			} else {
				if (rest == nil)

	if (_incompleteUTF8SurrogateLen > 0) {
		OFUnichar c;
		OFChar16 UTF16[2];
		ssize_t UTF8Len;
		size_t toCopy;
		DWORD UTF16Len, bytesWritten;

		UTF8Len = -of_string_utf8_decode(
		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);

		OFEnsure(UTF8Len > 0);

		toCopy = UTF8Len - _incompleteUTF8SurrogateLen;
		if (toCopy > length)
			toCopy = length;

		memcpy(_incompleteUTF8Surrogate + _incompleteUTF8SurrogateLen,
		    buffer, toCopy);
		_incompleteUTF8SurrogateLen += toCopy;

		if (_incompleteUTF8SurrogateLen < (size_t)UTF8Len)
			return 0;

		UTF8Len = of_string_utf8_decode(
		    _incompleteUTF8Surrogate, _incompleteUTF8SurrogateLen, &c);

		if (UTF8Len <= 0 || c > 0x10FFFF) {
			assert(UTF8Len == 0 || UTF8Len < -4);

			UTF16[0] = 0xFFFD;
			UTF16Len = 1;

	@try {
		DWORD bytesWritten;

		while (i < length) {
			OFUnichar c;
			ssize_t UTF8Len;

			UTF8Len = of_string_utf8_decode(buffer + i, length - i,
			    &c);

			if (UTF8Len < 0 && UTF8Len >= -4) {
				OFEnsure(length - i < 4);

				memcpy(_incompleteUTF8Surrogate, buffer + i,
				    length - i);