/*
  Hatari - keymap.c

  This file is distributed under the GNU General Public License, version 2
  or at your option any later version. Read the file gpl.txt for details.

  Map SDL key events to ST scancodes and send them to IKBD as
  pressed/released keys.  Based on Hatari configuration options,
  several different ways can be used to map SDL key events.
*/
const char Keymap_fileid[] = "Hatari keymap.c";

#include <ctype.h>
#include "main.h"
#include "keymap.h"
#include "configuration.h"
#include "file.h"
#include "ikbd.h"
#include "joy.h"
#include "shortcut.h"
#include "str.h"
#include "debugui.h"
#include "log.h"

/* if not able to map */
#define ST_NO_SCANCODE 0xff

/* Table for loaded keys: */
static int LoadedKeymap[KBD_MAX_SCANCODE][2];

/* List of ST scan codes to NOT de-bounce when running in maximum speed */
static const uint8_t DebounceExtendedKeys[] =
{
	0x1d,  /* CTRL */
	0x2a,  /* Left SHIFT */
	0x01,  /* ESC */
	0x38,  /* ALT */
	0x36,  /* Right SHIFT */
	0      /* term */
};



/*-----------------------------------------------------------------------*/
/**
 * Initialization.
 */
void Keymap_Init(void)
{
	Keymap_LoadRemapFile(ConfigureParams.Keyboard.szMappingFileName);
}

/**
 * Map SDL symbolic key to ST scan code.
 * This assumes a QWERTY ST keyboard.
 */
static uint8_t Keymap_SymbolicToStScanCode(const SDL_Keysym* pKeySym)
{
	uint8_t code;

	switch (pKeySym->sym)
	{
	 case SDLK_BACKSPACE: code = 0x0E; break;
	 case SDLK_TAB: code = 0x0F; break;
	 case SDLK_CLEAR: code = 0x47; break;
	 case SDLK_RETURN: code = 0x1C; break;
	 case SDLK_ESCAPE: code = 0x01; break;
	 case SDLK_SPACE: code = 0x39; break;
	 case SDLK_EXCLAIM: code = 0x09; break;     /* on azerty? */
	 case SDLK_QUOTEDBL: code = 0x04; break;    /* on azerty? */
	 case SDLK_HASH: code = 0x29; break;
	 case SDLK_DOLLAR: code = 0x1b; break;      /* on azerty */
	 case SDLK_AMPERSAND: code = 0x02; break;   /* on azerty? */
	 case SDLK_QUOTE: code = 0x28; break;
	 case SDLK_LEFTPAREN: code = 0x63; break;
	 case SDLK_RIGHTPAREN: code = 0x64; break;
	 case SDLK_ASTERISK: code = 0x66; break;
	 case SDLK_PLUS: code = 0x1B; break;
	 case SDLK_COMMA: code = 0x33; break;
	 case SDLK_MINUS: code = 0x35; break;
	 case SDLK_PERIOD: code = 0x34; break;
	 case SDLK_SLASH: code = 0x35; break;
	 case SDLK_0: code = 0x0B; break;
	 case SDLK_1: code = 0x02; break;
	 case SDLK_2: code = 0x03; break;
	 case SDLK_3: code = 0x04; break;
	 case SDLK_4: code = 0x05; break;
	 case SDLK_5: code = 0x06; break;
	 case SDLK_6: code = 0x07; break;
	 case SDLK_7: code = 0x08; break;
	 case SDLK_8: code = 0x09; break;
	 case SDLK_9: code = 0x0A; break;
	 case SDLK_COLON: code = 0x34; break;
	 case SDLK_SEMICOLON: code = 0x27; break;
	 case SDLK_LESS: code = 0x60; break;
	 case SDLK_EQUALS: code = 0x0D; break;
	 case SDLK_GREATER : code = 0x34; break;
	 case SDLK_QUESTION: code = 0x35; break;
	 case SDLK_AT: code = 0x28; break;
	 case SDLK_LEFTBRACKET: code = 0x1A; break;
	 case SDLK_BACKSLASH: code = 0x2B; break;     /* Might be 0x60 for UK keyboards */
	 case SDLK_RIGHTBRACKET: code = 0x1B; break;
	 case SDLK_CARET: code = 0x2B; break;
	 case SDLK_UNDERSCORE: code = 0x0C; break;
	 case SDLK_BACKQUOTE: code = 0x29; break;
	 case SDLK_a: code = 0x1E; break;
	 case SDLK_b: code = 0x30; break;
	 case SDLK_c: code = 0x2E; break;
	 case SDLK_d: code = 0x20; break;
	 case SDLK_e: code = 0x12; break;
	 case SDLK_f: code = 0x21; break;
	 case SDLK_g: code = 0x22; break;
	 case SDLK_h: code = 0x23; break;
	 case SDLK_i: code = 0x17; break;
	 case SDLK_j: code = 0x24; break;
	 case SDLK_k: code = 0x25; break;
	 case SDLK_l: code = 0x26; break;
	 case SDLK_m: code = 0x32; break;
	 case SDLK_n: code = 0x31; break;
	 case SDLK_o: code = 0x18; break;
	 case SDLK_p: code = 0x19; break;
	 case SDLK_q: code = 0x10; break;
	 case SDLK_r: code = 0x13; break;
	 case SDLK_s: code = 0x1F; break;
	 case SDLK_t: code = 0x14; break;
	 case SDLK_u: code = 0x16; break;
	 case SDLK_v: code = 0x2F; break;
	 case SDLK_w: code = 0x11; break;
	 case SDLK_x: code = 0x2D; break;
	 case SDLK_y: code = 0x15; break;
	 case SDLK_z: code = 0x2C; break;
	 case SDLK_DELETE: code = 0x53; break;
	 /* End of ASCII mapped keysyms */
	 case 180: code = 0x0D; break;
	 case 223: code = 0x0C; break;
	 case 228: code = 0x28; break;
	 case 246: code = 0x27; break;
	 case 252: code = 0x1A; break;
	 /* Numeric keypad: */
	 case SDLK_KP_0: code = 0x70; break;
	 case SDLK_KP_1: code = 0x6D; break;
	 case SDLK_KP_2: code = 0x6E; break;
	 case SDLK_KP_3: code = 0x6F; break;
	 case SDLK_KP_4: code = 0x6A; break;
	 case SDLK_KP_5: code = 0x6B; break;
	 case SDLK_KP_6: code = 0x6C; break;
	 case SDLK_KP_7: code = 0x67; break;
	 case SDLK_KP_8: code = 0x68; break;
	 case SDLK_KP_9: code = 0x69; break;
	 case SDLK_KP_PERIOD: code = 0x71; break;
	 case SDLK_KP_LEFTPAREN: code = 0x63; break;
	 case SDLK_KP_RIGHTPAREN: code = 0x64; break;
	 case SDLK_KP_DIVIDE: code = 0x65; break;
	 case SDLK_KP_MULTIPLY: code = 0x66; break;
	 case SDLK_KP_MINUS: code = 0x4A; break;
	 case SDLK_KP_PLUS: code = 0x4E; break;
	 case SDLK_KP_ENTER: code = 0x72; break;
	 case SDLK_KP_EQUALS: code = 0x61; break;
	 /* Arrows + Home/End pad */
	 case SDLK_UP: code = 0x48; break;
	 case SDLK_DOWN: code = 0x50; break;
	 case SDLK_RIGHT: code = 0x4D; break;
	 case SDLK_LEFT: code = 0x4B; break;
	 case SDLK_INSERT: code = 0x52; break;
	 case SDLK_HOME: code = 0x47; break;
	 case SDLK_END: code = 0x61; break;
	 case SDLK_PAGEUP: code = 0x63; break;
	 case SDLK_PAGEDOWN: code = 0x64; break;
	 /* Function keys */
	 case SDLK_F1: code = 0x3B; break;
	 case SDLK_F2: code = 0x3C; break;
	 case SDLK_F3: code = 0x3D; break;
	 case SDLK_F4: code = 0x3E; break;
	 case SDLK_F5: code = 0x3F; break;
	 case SDLK_F6: code = 0x40; break;
	 case SDLK_F7: code = 0x41; break;
	 case SDLK_F8: code = 0x42; break;
	 case SDLK_F9: code = 0x43; break;
	 case SDLK_F10: code = 0x44; break;
	 case SDLK_F11: code = 0x62; break;
	 case SDLK_F12: code = 0x61; break;
	 case SDLK_F13: code = 0x62; break;
	 /* Key state modifier keys */
	 case SDLK_CAPSLOCK: code = 0x3A; break;
	 case SDLK_SCROLLLOCK: code = 0x61; break;
	 case SDLK_RSHIFT: code = 0x36; break;
	 case SDLK_LSHIFT: code = 0x2A; break;
	 case SDLK_RCTRL: code = 0x1D; break;
	 case SDLK_LCTRL: code = 0x1D; break;
	 case SDLK_RALT: code = 0x38; break;
	 case SDLK_LALT: code = 0x38; break;
	 /* Miscellaneous function keys */
	 case SDLK_HELP: code = 0x62; break;
	 case SDLK_PRINTSCREEN: code = 0x62; break;
	 case SDLK_UNDO: code = 0x61; break;
	 default: code = ST_NO_SCANCODE;
	}

	return code;
}


/**
 * Remap SDL scancode key to ST Scan code
 */
static uint8_t Keymap_PcToStScanCode(const SDL_Keysym* pKeySym)
{
	switch (pKeySym->scancode)
	{
	 case SDL_SCANCODE_A: return 0x1e;
	 case SDL_SCANCODE_B: return 0x30;
	 case SDL_SCANCODE_C: return 0x2e;
	 case SDL_SCANCODE_D: return 0x20;
	 case SDL_SCANCODE_E: return 0x12;
	 case SDL_SCANCODE_F: return 0x21;
	 case SDL_SCANCODE_G: return 0x22;
	 case SDL_SCANCODE_H: return 0x23;
	 case SDL_SCANCODE_I: return 0x17;
	 case SDL_SCANCODE_J: return 0x24;
	 case SDL_SCANCODE_K: return 0x25;
	 case SDL_SCANCODE_L: return 0x26;
	 case SDL_SCANCODE_M: return 0x32;
	 case SDL_SCANCODE_N: return 0x31;
	 case SDL_SCANCODE_O: return 0x18;
	 case SDL_SCANCODE_P: return 0x19;
	 case SDL_SCANCODE_Q: return 0x10;
	 case SDL_SCANCODE_R: return 0x13;
	 case SDL_SCANCODE_S: return 0x1f;
	 case SDL_SCANCODE_T: return 0x14;
	 case SDL_SCANCODE_U: return 0x16;
	 case SDL_SCANCODE_V: return 0x2f;
	 case SDL_SCANCODE_W: return 0x11;
	 case SDL_SCANCODE_X: return 0x2d;
	 case SDL_SCANCODE_Y: return 0x15;
	 case SDL_SCANCODE_Z: return 0x2c;
	 case SDL_SCANCODE_1: return 0x02;
	 case SDL_SCANCODE_2: return 0x03;
	 case SDL_SCANCODE_3: return 0x04;
	 case SDL_SCANCODE_4: return 0x05;
	 case SDL_SCANCODE_5: return 0x06;
	 case SDL_SCANCODE_6: return 0x07;
	 case SDL_SCANCODE_7: return 0x08;
	 case SDL_SCANCODE_8: return 0x09;
	 case SDL_SCANCODE_9: return 0x0a;
	 case SDL_SCANCODE_0: return 0x0b;
	 case SDL_SCANCODE_RETURN: return 0x1c;
	 case SDL_SCANCODE_ESCAPE: return 0x01;
	 case SDL_SCANCODE_BACKSPACE: return 0x0e;
	 case SDL_SCANCODE_TAB: return 0x0f;
	 case SDL_SCANCODE_SPACE: return 0x39;
	 case SDL_SCANCODE_MINUS: return 0x0c;
	 case SDL_SCANCODE_EQUALS: return 0x0d;
	 case SDL_SCANCODE_LEFTBRACKET: return 0x1a;
	 case SDL_SCANCODE_RIGHTBRACKET: return 0x1b;
	 case SDL_SCANCODE_BACKSLASH: return 0x29;  /* for 0x60 see NONUSBACKSLASH */
	 case SDL_SCANCODE_NONUSHASH: return 0x2b;
	 case SDL_SCANCODE_SEMICOLON: return 0x27;
	 case SDL_SCANCODE_APOSTROPHE: return 0x28;
	 case SDL_SCANCODE_GRAVE: return 0x2b;      /* ok? */
	 case SDL_SCANCODE_COMMA: return 0x33;
	 case SDL_SCANCODE_PERIOD: return 0x34;
	 case SDL_SCANCODE_SLASH: return 0x35;
	 case SDL_SCANCODE_CAPSLOCK: return 0x3a;
	 case SDL_SCANCODE_F1: return 0x3b;
	 case SDL_SCANCODE_F2: return 0x3c;
	 case SDL_SCANCODE_F3: return 0x3d;
	 case SDL_SCANCODE_F4: return 0x3e;
	 case SDL_SCANCODE_F5: return 0x3f;
	 case SDL_SCANCODE_F6: return 0x40;
	 case SDL_SCANCODE_F7: return 0x41;
	 case SDL_SCANCODE_F8: return 0x42;
	 case SDL_SCANCODE_F9: return 0x43;
	 case SDL_SCANCODE_F10: return 0x44;
	 case SDL_SCANCODE_F11: return 0x62;
	 case SDL_SCANCODE_F12: return 0x61;
	 case SDL_SCANCODE_PRINTSCREEN: return 0x62;
	 case SDL_SCANCODE_SCROLLLOCK: return 0x61;
	 case SDL_SCANCODE_PAUSE: return 0x61;
	 case SDL_SCANCODE_INSERT: return 0x52;
	 case SDL_SCANCODE_HOME: return 0x47;
	 case SDL_SCANCODE_PAGEUP: return 0x63;
	 case SDL_SCANCODE_DELETE: return 0x53;
	 case SDL_SCANCODE_END: return 0x2b;
	 case SDL_SCANCODE_PAGEDOWN: return 0x64;
	 case SDL_SCANCODE_RIGHT: return 0x4d;
	 case SDL_SCANCODE_LEFT: return 0x4b;
	 case SDL_SCANCODE_DOWN: return 0x50;
	 case SDL_SCANCODE_UP: return 0x48;
	 case SDL_SCANCODE_NUMLOCKCLEAR: return 0x64;
	 case SDL_SCANCODE_KP_DIVIDE: return 0x65;
	 case SDL_SCANCODE_KP_MULTIPLY: return 0x66;
	 case SDL_SCANCODE_KP_MINUS: return 0x4a;
	 case SDL_SCANCODE_KP_PLUS: return 0x4e;
	 case SDL_SCANCODE_KP_ENTER: return 0x72;
	 case SDL_SCANCODE_KP_1: return 0x6d;
	 case SDL_SCANCODE_KP_2: return 0x6e;
	 case SDL_SCANCODE_KP_3: return 0x6f;
	 case SDL_SCANCODE_KP_4: return 0x6a;
	 case SDL_SCANCODE_KP_5: return 0x6b;
	 case SDL_SCANCODE_KP_6: return 0x6c;
	 case SDL_SCANCODE_KP_7: return 0x67;
	 case SDL_SCANCODE_KP_8: return 0x68;
	 case SDL_SCANCODE_KP_9: return 0x69;
	 case SDL_SCANCODE_KP_0: return 0x70;
	 case SDL_SCANCODE_KP_PERIOD: return 0x71;
	 case SDL_SCANCODE_NONUSBACKSLASH: return 0x60;
	 //case SDL_SCANCODE_APPLICATION: return ;
	 case SDL_SCANCODE_KP_EQUALS: return 0x63;
	 case SDL_SCANCODE_F13: return 0x63;
	 case SDL_SCANCODE_F14: return 0x64;
	 case SDL_SCANCODE_HELP: return 0x62;
	 case SDL_SCANCODE_UNDO: return 0x61;
	 case SDL_SCANCODE_KP_COMMA: return 0x71;
	 case SDL_SCANCODE_CLEAR: return 0x47;
	 case SDL_SCANCODE_RETURN2: return 0x1c;
	 case SDL_SCANCODE_KP_LEFTPAREN: return 0x63;
	 case SDL_SCANCODE_KP_RIGHTPAREN: return 0x64;
	 case SDL_SCANCODE_KP_LEFTBRACE: return 0x63;
	 case SDL_SCANCODE_KP_RIGHTBRACE: return 0x64;
	 case SDL_SCANCODE_KP_TAB: return 0x0f;
	 case SDL_SCANCODE_KP_BACKSPACE: return 0x0e;
	 case SDL_SCANCODE_KP_COLON: return 0x33;
	 case SDL_SCANCODE_KP_HASH: return 0x0c;
	 case SDL_SCANCODE_KP_SPACE: return 0x39;
	 case SDL_SCANCODE_KP_CLEAR: return 0x47;
	 case SDL_SCANCODE_LCTRL: return 0x1d;
	 case SDL_SCANCODE_LSHIFT: return 0x2a;
	 case SDL_SCANCODE_LALT: return 0x38;
	 case SDL_SCANCODE_RCTRL: return 0x1d;
	 case SDL_SCANCODE_RSHIFT: return 0x36;
	 default:
		if (!pKeySym->scancode && pKeySym->sym)
		{
			/* assume SimulateKey
			 * -> KeyUp/Down
			 *    -> Remap (with scancode mode configured)
			 *       -> PcToStScanCode
			 */
			return Keymap_SymbolicToStScanCode(pKeySym);
		}
		Log_Printf(LOG_WARN, "Unhandled scancode 0x%x!\n", pKeySym->scancode);
		return ST_NO_SCANCODE;
	}
}


/**
 * Remap a keypad key to ST scan code. We use a separate function for this
 * so that we can easily toggle between number and cursor mode with the
 * numlock key.
 */
static uint8_t Keymap_GetKeyPadScanCode(const SDL_Keysym* pKeySym)
{
	if (SDL_GetModState() & KMOD_NUM)
	{
		switch (pKeySym->sym)
		{
		 case SDLK_KP_1:  return 0x6d;  /* NumPad 1 */
		 case SDLK_KP_2:  return 0x6e;  /* NumPad 2 */
		 case SDLK_KP_3:  return 0x6f;  /* NumPad 3 */
		 case SDLK_KP_4:  return 0x6a;  /* NumPad 4 */
		 case SDLK_KP_5:  return 0x6b;  /* NumPad 5 */
		 case SDLK_KP_6:  return 0x6c;  /* NumPad 6 */
		 case SDLK_KP_7:  return 0x67;  /* NumPad 7 */
		 case SDLK_KP_8:  return 0x68;  /* NumPad 8 */
		 case SDLK_KP_9:  return 0x69;  /* NumPad 9 */
		 default:  break;
		}
	}
	else
	{
		switch (pKeySym->sym)
		{
		 case SDLK_KP_1:  return 0x6d;  /* NumPad 1 */
		 case SDLK_KP_2:  return 0x50;  /* Cursor down */
		 case SDLK_KP_3:  return 0x6f;  /* NumPad 3 */
		 case SDLK_KP_4:  return 0x4b;  /* Cursor left */
		 case SDLK_KP_5:  return 0x50;  /* Cursor down (again?) */
		 case SDLK_KP_6:  return 0x4d;  /* Cursor right */
		 case SDLK_KP_7:  return 0x52;  /* Insert - good for Dungeon Master */
		 case SDLK_KP_8:  return 0x48;  /* Cursor up */
		 case SDLK_KP_9:  return 0x47;  /* Home - again for Dungeon Master */
		 default:  break;
		}
	}
	return ST_NO_SCANCODE;
}


/**
 * Remap SDL Key to ST Scan code
 */
static uint8_t Keymap_RemapKeyToSTScanCode(const SDL_Keysym* pKeySym)
{
	/* Check for keypad first so we can handle numlock */
	if (ConfigureParams.Keyboard.nKeymapType != KEYMAP_LOADED)
	{
		if (pKeySym->sym >= SDLK_KP_1 && pKeySym->sym <= SDLK_KP_9)
		{
			return Keymap_GetKeyPadScanCode(pKeySym);
		}
	}

	/* Remap from PC scancodes? */
	if (ConfigureParams.Keyboard.nKeymapType == KEYMAP_SCANCODE)
	{
		return Keymap_PcToStScanCode(pKeySym);
	}

	/* Use loaded keymap? */
	if (ConfigureParams.Keyboard.nKeymapType == KEYMAP_LOADED)
	{
		int i;
		for (i = 0; i < KBD_MAX_SCANCODE && LoadedKeymap[i][1] != 0; i++)
		{
			if (pKeySym->sym == (SDL_Keycode)LoadedKeymap[i][0])
				return LoadedKeymap[i][1];
		}
	}

	/* Use symbolic mapping */
	return Keymap_SymbolicToStScanCode(pKeySym);
}


/*-----------------------------------------------------------------------*/
/**
 * Load keyboard remap file
 */
void Keymap_LoadRemapFile(const char *pszFileName)
{
	char szString[1024];
	int STScanCode, PCKeyCode;
	FILE *in;
	int idx = 0;

	/* Initialize table with default values */
	memset(LoadedKeymap, 0, sizeof(LoadedKeymap));

	if (!*pszFileName)
		return;

	/* Attempt to load file */
	if (!File_Exists(pszFileName))
	{
		Log_Printf(LOG_DEBUG, "Keymap_LoadRemapFile: '%s' not a file\n", pszFileName);
		return;
	}
	in = fopen(pszFileName, "r");
	if (!in)
	{
		Log_Printf(LOG_ERROR, "Keymap_LoadRemapFile: failed to "
			   " open keymap file '%s'\n", pszFileName);
		return;
	}

	while (!feof(in) && idx < KBD_MAX_SCANCODE)
	{
		/* Read line from file */
		if (fgets(szString, sizeof(szString), in) == NULL)
			break;
		/* Remove white-space from start of line */
		Str_Trim(szString);
		if (strlen(szString)>0)
		{
			char *p;
			/* Is a comment? */
			if (szString[0] == ';' || szString[0] == '#')
				continue;
			/* Cut out the values */
			p = strtok(szString, ",");
			if (!p)
				continue;
			Str_Trim(szString);
			PCKeyCode = atoi(szString);    /* Direct key code? */
			if (PCKeyCode < 10)
			{
				/* If it's not a valid number >= 10, then
				 * assume we've got a symbolic key name
				 */
				int offset = 0;
				/* quoted character (e.g. comment line char)? */
				if (*szString == '\\' && strlen(szString) == 2)
					offset = 1;
				PCKeyCode = Keymap_GetKeyFromName(szString+offset);
			}
			p = strtok(NULL, "\n");
			if (!p)
				continue;
			STScanCode = atoi(p);
			/* Store into remap table, check both value within range */
			if (STScanCode > 0 && STScanCode <= KBD_MAX_SCANCODE
			    && PCKeyCode >= 8)
			{
				LOG_TRACE(TRACE_KEYMAP,
				          "keymap from file: sym=%i --> scan=%i\n",
				          PCKeyCode, STScanCode);
				LoadedKeymap[idx][0] = PCKeyCode;
				LoadedKeymap[idx][1] = STScanCode;
				idx += 1;
			}
			else
			{
				Log_Printf(LOG_WARN, "Could not parse keymap file:"
				           " '%s' (%d >= 8), '%s' (0 > %d <= %d)\n",
					   szString, PCKeyCode, p, STScanCode, KBD_MAX_SCANCODE);
			}
		}
	}

	fclose(in);
}


/*-----------------------------------------------------------------------*/
/**
 * Scan list of keys to NOT de-bounce when running in maximum speed, eg ALT,SHIFT,CTRL etc...
 * @return true if key requires de-bouncing
 */
static bool Keymap_DebounceSTKey(uint8_t STScanCode)
{
	int i=0;

	/* Are we in fast forward, and have disabled key repeat? */
	if ((ConfigureParams.System.bFastForward == true)
	    && (ConfigureParams.Keyboard.bDisableKeyRepeat))
	{
		/* We should de-bounce all non extended keys,
		 * e.g. leave ALT, SHIFT, CTRL etc... held */
		while (DebounceExtendedKeys[i])
		{
			if (STScanCode == DebounceExtendedKeys[i])
				return false;
			i++;
		}

		/* De-bounce key */
		return true;
	}

	/* Do not de-bounce key */
	return false;
}


/*-----------------------------------------------------------------------*/
/**
 * Debounce any PC key held down if running with key repeat disabled.
 * This is called each ST frame, so keys get held down for one VBL which
 * is enough for 68000 code to scan.
 */
void Keymap_DebounceAllKeys(void)
{
	uint8_t nScanCode;

	/* Return if we aren't in fast forward or have not disabled key repeat */
	if ((ConfigureParams.System.bFastForward == false)
	        || (!ConfigureParams.Keyboard.bDisableKeyRepeat))
	{
		return;
	}

	/* Now run through each key looking for ones held down */
	for (nScanCode = 1; nScanCode < ARRAY_SIZE(Keyboard.KeyStates); nScanCode++)
	{
		/* Is key held? */
		if (Keyboard.KeyStates[nScanCode])
		{
			/* Does this require de-bouncing? */
			if (Keymap_DebounceSTKey(nScanCode))
			{
				IKBD_PressSTKey(nScanCode, false);
				Keyboard.KeyStates[nScanCode] = false;
			}
		}
	}

}


/*-----------------------------------------------------------------------*/
/* Returns false if SDL_Keycode is for modifier key that
 * won't be converted to ST scancode, true otherwise
 */
static bool IsKeyTranslatable(SDL_Keycode symkey)
{
	switch (symkey)
	{
	case SDLK_RALT:
	case SDLK_LGUI:
	case SDLK_RGUI:
	case SDLK_MODE:
	case SDLK_NUMLOCKCLEAR:
		return false;
	}
	return true;
}


/*-----------------------------------------------------------------------*/
/**
 * User pressed a key down
 */
void Keymap_KeyDown(const SDL_Keysym *sdlkey)
{
	uint8_t STScanCode;
	int symkey = sdlkey->sym;
	int modkey = sdlkey->mod;

	LOG_TRACE(TRACE_KEYMAP, "key down: sym=%i scan=%i mod=0x%x name='%s'\n",
	          symkey, sdlkey->scancode, modkey, Keymap_GetKeyName(symkey));

	if (ShortCut_CheckKeys(modkey, symkey, true))
		return;

	/* If using joystick emulation via keyboard, DON'T send keys to keyboard processor!!!
	 * Some games use keyboard as pause! */
	if (Joy_KeyDown(symkey, modkey))
		return;

	/* Ignore modifier keys that are not passed to the ST */
	if (!IsKeyTranslatable(symkey))
		return;

	STScanCode = Keymap_RemapKeyToSTScanCode(sdlkey);
	LOG_TRACE(TRACE_KEYMAP, "key map: sym=0x%x to ST-scan=0x%02x\n", symkey, STScanCode);
	if (STScanCode != ST_NO_SCANCODE)
	{
		if (!Keyboard.KeyStates[STScanCode])
		{
			/* Set down */
			Keyboard.KeyStates[STScanCode] = true;
			IKBD_PressSTKey(STScanCode, true);
		}
	}
}


/*-----------------------------------------------------------------------*/
/**
 * User released a key
 */
void Keymap_KeyUp(const SDL_Keysym *sdlkey)
{
	uint8_t STScanCode;
	int symkey = sdlkey->sym;
	int modkey = sdlkey->mod;

	LOG_TRACE(TRACE_KEYMAP, "key up: sym=%i scan=%i mod=0x%x name='%s'\n",
	          symkey, sdlkey->scancode, modkey, Keymap_GetKeyName(symkey));

	/* Ignore short-cut keys here */
	if (ShortCut_CheckKeys(modkey, symkey, false))
		return;

	/* If using keyboard emulation, DON'T send keys to keyboard processor!!!
	 * Some games use keyboard as pause! */
	if (Joy_KeyUp(symkey, modkey))
		return;

	/* Ignore modifier keys that are not passed to the ST */
	if (!IsKeyTranslatable(symkey))
		return;

	STScanCode = Keymap_RemapKeyToSTScanCode(sdlkey);
	/* Release key (only if was pressed) */
	if (STScanCode != ST_NO_SCANCODE)
	{
		if (Keyboard.KeyStates[STScanCode])
		{
			IKBD_PressSTKey(STScanCode, false);
			Keyboard.KeyStates[STScanCode] = false;
		}
	}
}

/*-----------------------------------------------------------------------*/
/**
 * Simulate press or release of a key corresponding to given character
 */
void Keymap_SimulateCharacter(char asckey, bool press)
{
	SDL_Keysym sdlkey;

	sdlkey.mod = KMOD_NONE;
	sdlkey.scancode = 0;
	if (isupper((unsigned char)asckey))
	{
		if (press)
		{
			sdlkey.sym = SDLK_LSHIFT;
			Keymap_KeyDown(&sdlkey);
		}
		sdlkey.sym = tolower((unsigned char)asckey);
		sdlkey.mod = KMOD_LSHIFT;
	}
	else
	{
		sdlkey.sym = asckey;
	}
	if (press)
	{
		Keymap_KeyDown(&sdlkey);
	}
	else
	{
		Keymap_KeyUp(&sdlkey);
		if (isupper((unsigned char)asckey))
		{
			sdlkey.sym = SDLK_LSHIFT;
			Keymap_KeyUp(&sdlkey);
		}
	}
}


int Keymap_GetKeyFromName(const char *name)
{
	return SDL_GetKeyFromName(name);
}

const char *Keymap_GetKeyName(int keycode)
{
	if (!keycode)
		return "";

	return SDL_GetKeyName(keycode);
}
