Function Input_Keyboard_HandleKeys

src/input/input.c:591–655

* Handle keyboard input. * @param value Combined keycode and modifier flags. * @return key value and modifier flags. (ASCII value or > 0x80) * @todo Most users seem to ignore the returned high byte, perhaps make it a * uint8 at some time in the future? */

 *      uint8 at some time in the future?
 */
uint16 Input_Keyboard_HandleKeys(uint16 value)
{
	uint16 keyFlags;

	keyFlags = value & 0xFF00;
	value &= 0x00FF;

	if ((keyFlags & 0x8000) != 0 || (keyFlags & 0x800) != 0) {
		return 0;	/* return on key up */
	}

	if (value == 0x6E) {
		return keyFlags | 0x1B;	/* ESCAPE */
	}

	if (value < 0x3E) {	/* Printables Chars */
		uint8 keySave = value & 0x3F;
		uint16 asciiValue;

		if ((keyFlags & 0x100) != 0) {
			asciiValue = s_keymapShift[keySave];
		} else {
			asciiValue = s_keymapNormal[keySave];
		}

		if ((keyFlags & 0x200) != 0) {	/* ALT */
			if ((s_keymapSpecialMask[keySave >> 3] & (1 << (keySave & 7))) != 0) {
				asciiValue &= 0x1F;
			}
		}
		return keyFlags | asciiValue;
	}

	if (value < 0x4B) {
		/* 0x3E - 0x4A : unused codes ? */
		if (value >= 0x41) {
			return keyFlags | (value + 0x85);	/* 0x41-0x4A => 0xC6-0xCF */
		}
		return keyFlags | value | 0x80;	/* 0x3E 0x3F 0x40 => 0xBE 0xBF 0xC0 */
	}

	if (value < 0x6E) {
		/* 0x4B - 0x6D : Keypad + grey edit keys */
		if (value >= 0x5A) {
			return s_keymapNumlock[value - 0x5A];
		} else {
			/*return s_keymapNumpad[value - 0x4B]; CODE has been removed in 1b81370b006 */
		}
	}

	if (value < 0x70 || value > 0x79) {
		return keyFlags | value | 0x80;
	}
	value -= 0x70;	/* F1-F10 Function keys */
	if ((keyFlags & 0x700) != 0) {
		if ((keyFlags & 0x400) == 0) {	/* ? */
			if ((keyFlags & 0x200) == 0) {	/* ALT */
				return keyFlags | (0xAC - value); /* 0xA3 - 0xAC */