src/events/SDL_keyboard.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* General keyboard handling code for SDL */

#include "SDL_timer.h"
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "SDL_sysevents.h"


/* Global keyboard information */
static int SDL_num_keyboards;
static int SDL_current_keyboard;
static SDL_Keyboard **SDL_keyboards;

static const SDLKey SDL_default_keymap[SDL_NUM_SCANCODES] = {
    0, 0, 0, 0,
    'a',
    'b',
    'c',
    'd',
    'e',
    'f',
    'g',
    'h',
    'i',
    'j',
    'k',
    'l',
    'm',
    'n',
    'o',
    'p',
    'q',
    'r',
    's',
    't',
    'u',
    'v',
    'w',
    'x',
    'y',
    'z',
    '1',
    '2',
    '3',
    '4',
    '5',
    '6',
    '7',
    '8',
    '9',
    '0',
    SDLK_RETURN,
    SDLK_ESCAPE,
    SDLK_BACKSPACE,
    SDLK_TAB,
    SDLK_SPACE,
    '-',
    '=',
    '[',
    ']',
    '\\',
    '#',
    ';',
    '\'',
    '`',
    ',',
    '.',
    '/',
    SDLK_CAPSLOCK,
    SDLK_F1,
    SDLK_F2,
    SDLK_F3,
    SDLK_F4,
    SDLK_F5,
    SDLK_F6,
    SDLK_F7,
    SDLK_F8,
    SDLK_F9,
    SDLK_F10,
    SDLK_F11,
    SDLK_F12,
    SDLK_PRINTSCREEN,
    SDLK_SCROLLLOCK,
    SDLK_PAUSE,
    SDLK_INSERT,
    SDLK_HOME,
    SDLK_PAGEUP,
    SDLK_DELETE,
    SDLK_END,
    SDLK_PAGEDOWN,
    SDLK_RIGHT,
    SDLK_LEFT,
    SDLK_DOWN,
    SDLK_UP,
    SDLK_NUMLOCKCLEAR,
    SDLK_KP_DIVIDE,
    SDLK_KP_MULTIPLY,
    SDLK_KP_MINUS,
    SDLK_KP_PLUS,
    SDLK_KP_ENTER,
    SDLK_KP_1,
    SDLK_KP_2,
    SDLK_KP_3,
    SDLK_KP_4,
    SDLK_KP_5,
    SDLK_KP_6,
    SDLK_KP_7,
    SDLK_KP_8,
    SDLK_KP_9,
    SDLK_KP_0,
    SDLK_KP_PERIOD,
    0,
    SDLK_APPLICATION,
    SDLK_POWER,
    SDLK_KP_EQUALS,
    SDLK_F13,
    SDLK_F14,
    SDLK_F15,
    SDLK_F16,
    SDLK_F17,
    SDLK_F18,
    SDLK_F19,
    SDLK_F20,
    SDLK_F21,
    SDLK_F22,
    SDLK_F23,
    SDLK_F24,
    SDLK_EXECUTE,
    SDLK_HELP,
    SDLK_MENU,
    SDLK_SELECT,
    SDLK_STOP,
    SDLK_AGAIN,
    SDLK_UNDO,
    SDLK_CUT,
    SDLK_COPY,
    SDLK_PASTE,
    SDLK_FIND,
    SDLK_MUTE,
    SDLK_VOLUMEUP,
    SDLK_VOLUMEDOWN,
    0, 0, 0,
    SDLK_KP_COMMA,
    SDLK_KP_EQUALSAS400,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    SDLK_ALTERASE,
    SDLK_SYSREQ,
    SDLK_CANCEL,
    SDLK_CLEAR,
    SDLK_PRIOR,
    SDLK_RETURN2,
    SDLK_SEPARATOR,
    SDLK_OUT,
    SDLK_OPER,
    SDLK_CLEARAGAIN,
    SDLK_CRSEL,
    SDLK_EXSEL,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    SDLK_KP_00,
    SDLK_KP_000,
    SDLK_THOUSANDSSEPARATOR,
    SDLK_DECIMALSEPARATOR,
    SDLK_CURRENCYUNIT,
    SDLK_CURRENCYSUBUNIT,
    SDLK_KP_LEFTPAREN,
    SDLK_KP_RIGHTPAREN,
    SDLK_KP_LEFTBRACE,
    SDLK_KP_RIGHTBRACE,
    SDLK_KP_TAB,
    SDLK_KP_BACKSPACE,
    SDLK_KP_A,
    SDLK_KP_B,
    SDLK_KP_C,
    SDLK_KP_D,
    SDLK_KP_E,
    SDLK_KP_F,
    SDLK_KP_XOR,
    SDLK_KP_POWER,
    SDLK_KP_PERCENT,
    SDLK_KP_LESS,
    SDLK_KP_GREATER,
    SDLK_KP_AMPERSAND,
    SDLK_KP_DBLAMPERSAND,
    SDLK_KP_VERTICALBAR,
    SDLK_KP_DBLVERTICALBAR,
    SDLK_KP_COLON,
    SDLK_KP_HASH,
    SDLK_KP_SPACE,
    SDLK_KP_AT,
    SDLK_KP_EXCLAM,
    SDLK_KP_MEMSTORE,
    SDLK_KP_MEMRECALL,
    SDLK_KP_MEMCLEAR,
    SDLK_KP_MEMADD,
    SDLK_KP_MEMSUBTRACT,
    SDLK_KP_MEMMULTIPLY,
    SDLK_KP_MEMDIVIDE,
    SDLK_KP_PLUSMINUS,
    SDLK_KP_CLEAR,
    SDLK_KP_CLEARENTRY,
    SDLK_KP_BINARY,
    SDLK_KP_OCTAL,
    SDLK_KP_DECIMAL,
    SDLK_KP_HEXADECIMAL,
    0, 0,
    SDLK_LCTRL,
    SDLK_LSHIFT,
    SDLK_LALT,
    SDLK_LGUI,
    SDLK_RCTRL,
    SDLK_RSHIFT,
    SDLK_RALT,
    SDLK_RGUI,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    SDLK_MODE,
    SDLK_AUDIONEXT,
    SDLK_AUDIOPREV,
    SDLK_AUDIOSTOP,
    SDLK_AUDIOPLAY,
    SDLK_AUDIOMUTE,
    SDLK_MEDIASELECT,
    SDLK_WWW,
    SDLK_MAIL,
    SDLK_CALCULATOR,
    SDLK_COMPUTER,
    SDLK_AC_SEARCH,
    SDLK_AC_HOME,
    SDLK_AC_BACK,
    SDLK_AC_FORWARD,
    SDLK_AC_STOP,
    SDLK_AC_REFRESH,
    SDLK_AC_BOOKMARKS,
    SDLK_BRIGHTNESSDOWN,
    SDLK_BRIGHTNESSUP,
    SDLK_DISPLAYSWITCH,
    SDLK_KBDILLUMTOGGLE,
    SDLK_KBDILLUMDOWN,
    SDLK_KBDILLUMUP,
    SDLK_EJECT,
    SDLK_SLEEP,
};

static const char *SDL_scancode_names[SDL_NUM_SCANCODES] = {
    NULL, NULL, NULL, NULL,
    "A",
    "B",
    "C",
    "D",
    "E",
    "F",
    "G",
    "H",
    "I",
    "J",
    "K",
    "L",
    "M",
    "N",
    "O",
    "P",
    "Q",
    "R",
    "S",
    "T",
    "U",
    "V",
    "W",
    "X",
    "Y",
    "Z",
    "1",
    "2",
    "3",
    "4",
    "5",
    "6",
    "7",
    "8",
    "9",
    "0",
    "Return",
    "Escape",
    "Backspace",
    "Tab",
    "Space",
    "-",
    "=",
    "[",
    "]",
    "\\",
    "#",
    ";",
    "'",
    "`",
    ",",
    ".",
    "/",
    "CapsLock",
    "F1",
    "F2",
    "F3",
    "F4",
    "F5",
    "F6",
    "F7",
    "F8",
    "F9",
    "F10",
    "F11",
    "F12",
    "PrintScreen",
    "ScrollLock",
    "Pause",
    "Insert",
    "Home",
    "PageUp",
    "Delete",
    "End",
    "PageDown",
    "Right",
    "Left",
    "Down",
    "Up",
    "Numlock",
    "Keypad /",
    "Keypad *",
    "Keypad -",
    "Keypad +",
    "Keypad Enter",
    "Keypad 1",
    "Keypad 2",
    "Keypad 3",
    "Keypad 4",
    "Keypad 5",
    "Keypad 6",
    "Keypad 7",
    "Keypad 8",
    "Keypad 9",
    "Keypad 0",
    "Keypad .",
    NULL,
    "Application",
    "Power",
    "Keypad =",
    "F13",
    "F14",
    "F15",
    "F16",
    "F17",
    "F18",
    "F19",
    "F20",
    "F21",
    "F22",
    "F23",
    "F24",
    "Execute",
    "Help",
    "Menu",
    "Select",
    "Stop",
    "Again",
    "Undo",
    "Cut",
    "Copy",
    "Paste",
    "Find",
    "Mute",
    "VolumeUp",
    "VolumeDown",
    NULL, NULL, NULL,
    "Keypad ,",
    "Keypad = (AS400)",
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    NULL, NULL, NULL, NULL, NULL, NULL,
    "AltErase",
    "SysReq",
    "Cancel",
    "Clear",
    "Prior",
    "Return",
    "Separator",
    "Out",
    "Oper",
    "Clear / Again",
    "CrSel",
    "ExSel",
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    "Keypad 00",
    "Keypad 000",
    "ThousandsSeparator",
    "DecimalSeparator",
    "CurrencyUnit",
    "CurrencySubUnit",
    "Keypad (",
    "Keypad )",
    "Keypad {",
    "Keypad }",
    "Keypad Tab",
    "Keypad Backspace",
    "Keypad A",
    "Keypad B",
    "Keypad C",
    "Keypad D",
    "Keypad E",
    "Keypad F",
    "Keypad XOR",
    "Keypad ^",
    "Keypad %",
    "Keypad <",
    "Keypad >",
    "Keypad &",
    "Keypad &&",
    "Keypad |",
    "Keypad ||",
    "Keypad :",
    "Keypad #",
    "Keypad Space",
    "Keypad @",
    "Keypad !",
    "Keypad MemStore",
    "Keypad MemRecall",
    "Keypad MemClear",
    "Keypad MemAdd",
    "Keypad MemSubtract",
    "Keypad MemMultiply",
    "Keypad MemDivide",
    "Keypad +/-",
    "Keypad Clear",
    "Keypad ClearEntry",
    "Keypad Binary",
    "Keypad Octal",
    "Keypad Decimal",
    "Keypad Hexadecimal",
    NULL, NULL,
    "Left Ctrl",
    "Left Shift",
    "Left Alt",
    "Left GUI",
    "Right Ctrl",
    "Right Shift",
    "Right Alt",
    "Right GUI",
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
    NULL,
    "ModeSwitch",
    "AudioNext",
    "AudioPrev",
    "AudioStop",
    "AudioPlay",
    "AudioMute",
    "MediaSelect",
    "WWW",
    "Mail",
    "Calculator",
    "Computer",
    "AC Search",
    "AC Home",
    "AC Back",
    "AC Forward",
    "AC Stop",
    "AC Refresh",
    "AC Bookmarks",
    "BrightnessDown",
    "BrightnessUp",
    "DisplaySwitch",
    "KBDIllumToggle",
    "KBDIllumDown",
    "KBDIllumUp",
    "Eject",
    "Sleep",
};

/* Taken from SDL_iconv() */
static char *
SDL_UCS4ToUTF8(Uint32 ch, char *dst)
{
    Uint8 *p = (Uint8 *) dst;
    if (ch <= 0x7F) {
        *p = (Uint8) ch;
        ++dst;
    } else if (ch <= 0x7FF) {
        p[0] = 0xC0 | (Uint8) ((ch >> 6) & 0x1F);
        p[1] = 0x80 | (Uint8) (ch & 0x3F);
        dst += 2;
    } else if (ch <= 0xFFFF) {
        p[0] = 0xE0 | (Uint8) ((ch >> 12) & 0x0F);
        p[1] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
        p[2] = 0x80 | (Uint8) (ch & 0x3F);
        dst += 3;
    } else if (ch <= 0x1FFFFF) {
        p[0] = 0xF0 | (Uint8) ((ch >> 18) & 0x07);
        p[1] = 0x80 | (Uint8) ((ch >> 12) & 0x3F);
        p[2] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
        p[3] = 0x80 | (Uint8) (ch & 0x3F);
        dst += 4;
    } else if (ch <= 0x3FFFFFF) {
        p[0] = 0xF8 | (Uint8) ((ch >> 24) & 0x03);
        p[1] = 0x80 | (Uint8) ((ch >> 18) & 0x3F);
        p[2] = 0x80 | (Uint8) ((ch >> 12) & 0x3F);
        p[3] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
        p[4] = 0x80 | (Uint8) (ch & 0x3F);
        dst += 5;
    } else {
        p[0] = 0xFC | (Uint8) ((ch >> 30) & 0x01);
        p[1] = 0x80 | (Uint8) ((ch >> 24) & 0x3F);
        p[2] = 0x80 | (Uint8) ((ch >> 18) & 0x3F);
        p[3] = 0x80 | (Uint8) ((ch >> 12) & 0x3F);
        p[4] = 0x80 | (Uint8) ((ch >> 6) & 0x3F);
        p[5] = 0x80 | (Uint8) (ch & 0x3F);
        dst += 6;
    }
    return dst;
}

/* Public functions */
int
SDL_KeyboardInit(void)
{
    return (0);
}

SDL_Keyboard *
SDL_GetKeyboard(int index)
{
    if (index < 0 || index >= SDL_num_keyboards) {
        return NULL;
    }
    return SDL_keyboards[index];
}

int
SDL_AddKeyboard(const SDL_Keyboard * keyboard, int index)
{
    SDL_Keyboard **keyboards;

    /* Add the keyboard to the list of keyboards */
    if (index < 0 || index >= SDL_num_keyboards || SDL_keyboards[index]) {
        keyboards =
            (SDL_Keyboard **) SDL_realloc(SDL_keyboards,
                                          (SDL_num_keyboards +
                                           1) * sizeof(*keyboards));
        if (!keyboards) {
            SDL_OutOfMemory();
            return -1;
        }

        SDL_keyboards = keyboards;
        index = SDL_num_keyboards++;
    }
    SDL_keyboards[index] =
        (SDL_Keyboard *) SDL_malloc(sizeof(*SDL_keyboards[index]));
    if (!SDL_keyboards[index]) {
        SDL_OutOfMemory();
        return -1;
    }
    *SDL_keyboards[index] = *keyboard;

    return index;
}

void
SDL_DelKeyboard(int index)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);

    if (!keyboard) {
        return;
    }

    if (keyboard->FreeKeyboard) {
        keyboard->FreeKeyboard(keyboard);
    }
    SDL_free(keyboard);

    SDL_keyboards[index] = NULL;
}

void
SDL_ResetKeyboard(int index)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);
    SDL_scancode scancode;

    if (!keyboard) {
        return;
    }

    for (scancode = 0; scancode < SDL_NUM_SCANCODES; ++scancode) {
        if (keyboard->keystate[scancode] == SDL_PRESSED) {
            SDL_SendKeyboardKey(index, SDL_RELEASED, scancode);
        }
    }
}

void
SDL_GetDefaultKeymap(SDLKey * keymap)
{
    SDL_memcpy(keymap, SDL_default_keymap, sizeof(SDL_default_keymap));
}

void
SDL_SetKeymap(int index, int start, SDLKey * keys, int length)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);

    if (!keyboard) {
        return;
    }

    if (start < 0 || start + length > SDL_NUM_SCANCODES) {
        return;
    }

    SDL_memcpy(&keyboard->keymap[start], keys, sizeof(*keys) * length);
}

void
SDL_SetScancodeName(SDL_scancode scancode, const char *name)
{
    SDL_scancode_names[scancode] = name;
}

void
SDL_SetKeyboardFocus(int index, SDL_WindowID windowID)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);
    int i;
    SDL_bool focus;

    if (!keyboard) {
        return;
    }

    /* See if the current window has lost focus */
    if (keyboard->focus && keyboard->focus != windowID) {
        focus = SDL_FALSE;
        for (i = 0; i < SDL_num_keyboards; ++i) {
            if (i != index) {
                SDL_Keyboard *check = SDL_GetKeyboard(i);
                if (check && check->focus == keyboard->focus) {
                    focus = SDL_TRUE;
                    break;
                }
            }
        }
        if (!focus) {
            SDL_SendWindowEvent(keyboard->focus, SDL_WINDOWEVENT_FOCUS_LOST,
                                0, 0);
        }
    }

    keyboard->focus = windowID;

    if (keyboard->focus) {
        SDL_SendWindowEvent(keyboard->focus, SDL_WINDOWEVENT_FOCUS_GAINED,
                            0, 0);
    }
}

int
SDL_SendKeyboardKey(int index, Uint8 state, SDL_scancode scancode)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);
    int posted;
    Uint16 modstate;
    Uint8 type;

    if (!keyboard || !scancode) {
        return 0;
    }
#if 0
    printf("The '%s' key has been %s\n", SDL_GetScancodeName(scancode),
           state == SDL_PRESSED ? "pressed" : "released");
#endif
    if (state == SDL_PRESSED) {
        modstate = keyboard->modstate;
        switch (scancode) {
        case SDL_SCANCODE_NUMLOCKCLEAR:
            keyboard->modstate ^= KMOD_NUM;
            break;
        case SDL_SCANCODE_CAPSLOCK:
            keyboard->modstate ^= KMOD_CAPS;
            break;
        case SDL_SCANCODE_LCTRL:
            keyboard->modstate |= KMOD_LCTRL;
            break;
        case SDL_SCANCODE_RCTRL:
            keyboard->modstate |= KMOD_RCTRL;
            break;
        case SDL_SCANCODE_LSHIFT:
            keyboard->modstate |= KMOD_LSHIFT;
            break;
        case SDL_SCANCODE_RSHIFT:
            keyboard->modstate |= KMOD_RSHIFT;
            break;
        case SDL_SCANCODE_LALT:
            keyboard->modstate |= KMOD_LALT;
            break;
        case SDL_SCANCODE_RALT:
            keyboard->modstate |= KMOD_RALT;
            break;
        case SDL_SCANCODE_LGUI:
            keyboard->modstate |= KMOD_LGUI;
            break;
        case SDL_SCANCODE_RGUI:
            keyboard->modstate |= KMOD_RGUI;
            break;
        case SDL_SCANCODE_MODE:
            keyboard->modstate |= KMOD_MODE;
            break;
        default:
            break;
        }
    } else {
        switch (scancode) {
        case SDL_SCANCODE_NUMLOCKCLEAR:
        case SDL_SCANCODE_CAPSLOCK:
            break;
        case SDL_SCANCODE_LCTRL:
            keyboard->modstate &= ~KMOD_LCTRL;
            break;
        case SDL_SCANCODE_RCTRL:
            keyboard->modstate &= ~KMOD_RCTRL;
            break;
        case SDL_SCANCODE_LSHIFT:
            keyboard->modstate &= ~KMOD_LSHIFT;
            break;
        case SDL_SCANCODE_RSHIFT:
            keyboard->modstate &= ~KMOD_RSHIFT;
            break;
        case SDL_SCANCODE_LALT:
            keyboard->modstate &= ~KMOD_LALT;
            break;
        case SDL_SCANCODE_RALT:
            keyboard->modstate &= ~KMOD_RALT;
            break;
        case SDL_SCANCODE_LGUI:
            keyboard->modstate &= ~KMOD_LGUI;
            break;
        case SDL_SCANCODE_RGUI:
            keyboard->modstate &= ~KMOD_RGUI;
            break;
        case SDL_SCANCODE_MODE:
            keyboard->modstate &= ~KMOD_MODE;
            break;
        default:
            break;
        }
        modstate = keyboard->modstate;
    }

    /* Figure out what type of event this is */
    switch (state) {
    case SDL_PRESSED:
        type = SDL_KEYDOWN;
        break;
    case SDL_RELEASED:
        type = SDL_KEYUP;
        break;
    default:
        /* Invalid state -- bail */
        return 0;
    }

    /* Drop events that don't change state */
    if (keyboard->keystate[scancode] == state) {
#if 0
        printf("Keyboard event didn't change state - dropped!\n");
#endif
        return 0;
    }

    /* Update internal keyboard state */
    keyboard->keystate[scancode] = state;

    /* Post the event, if desired */
    posted = 0;
    if (SDL_ProcessEvents[type] == SDL_ENABLE) {
        SDL_Event event;
        event.key.type = type;
        event.key.which = (Uint8) index;
        event.key.state = state;
        event.key.keysym.scancode = scancode;
        event.key.keysym.sym = keyboard->keymap[scancode];
        event.key.keysym.mod = modstate;
        event.key.keysym.unicode = 0;
        event.key.windowID = keyboard->focus;
        posted = (SDL_PushEvent(&event) > 0);
    }
    return (posted);
}

int
SDL_SendKeyboardText(int index, const char *text)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(index);
    int posted;

    if (!keyboard) {
        return 0;
    }

    /* Post the event, if desired */
    posted = 0;
    if (SDL_ProcessEvents[SDL_TEXTINPUT] == SDL_ENABLE) {
        SDL_Event event;
        event.text.type = SDL_TEXTINPUT;
        event.text.which = (Uint8) index;
        SDL_strlcpy(event.text.text, text, SDL_arraysize(event.text.text));
        event.text.windowID = keyboard->focus;
        posted = (SDL_PushEvent(&event) > 0);
    }
    return (posted);
}

int
SDL_SendEditingText(const char *text, int start, int length)
{
    int posted;

    /* Post the event, if desired */
    posted = 0;
    if (SDL_ProcessEvents[SDL_TEXTEDITING] == SDL_ENABLE) {
        SDL_Event event;
        event.edit.type = SDL_TEXTEDITING;
        event.edit.start = start;
        event.edit.length = length;
        SDL_strlcpy(event.edit.text, text, SDL_arraysize(event.text.text));
        posted = (SDL_PushEvent(&event) > 0);
    }
    return (posted);
}

void
SDL_KeyboardQuit(void)
{
    int i;

    for (i = 0; i < SDL_num_keyboards; ++i) {
        SDL_DelKeyboard(i);
    }
    SDL_num_keyboards = 0;
    SDL_current_keyboard = 0;

    if (SDL_keyboards) {
        SDL_free(SDL_keyboards);
        SDL_keyboards = NULL;
    }
}

int
SDL_GetNumKeyboards(void)
{
    return SDL_num_keyboards;
}

int
SDL_SelectKeyboard(int index)
{
    if (index >= 0 && index < SDL_num_keyboards) {
        SDL_current_keyboard = index;
    }
    return SDL_current_keyboard;
}

Uint8 *
SDL_GetKeyboardState(int *numkeys)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(SDL_current_keyboard);

    if (numkeys != (int *) 0) {
        *numkeys = SDL_NUM_SCANCODES;
    }

    if (!keyboard) {
        return NULL;
    }
    return keyboard->keystate;
}

SDLMod
SDL_GetModState(void)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(SDL_current_keyboard);

    if (!keyboard) {
        return KMOD_NONE;
    }
    return keyboard->modstate;
}

void
SDL_SetModState(SDLMod modstate)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(SDL_current_keyboard);

    if (!keyboard) {
        return;
    }
    keyboard->modstate = modstate;
}

SDLKey
SDL_GetKeyFromScancode(SDL_scancode scancode)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(SDL_current_keyboard);

    if (!keyboard) {
        return SDLK_UNKNOWN;
    }
    return keyboard->keymap[scancode];
}

SDL_scancode
SDL_GetScancodeFromKey(SDLKey key)
{
    SDL_Keyboard *keyboard = SDL_GetKeyboard(SDL_current_keyboard);
    SDL_scancode scancode;

    if (!keyboard) {
        return SDL_SCANCODE_UNKNOWN;
    }

    for (scancode = SDL_SCANCODE_UNKNOWN; scancode < SDL_NUM_SCANCODES;
         ++scancode) {
        if (keyboard->keymap[scancode] == key) {
            return scancode;
        }
    }
    return SDL_SCANCODE_UNKNOWN;
}

const char *
SDL_GetScancodeName(SDL_scancode scancode)
{
    const char *name = SDL_scancode_names[scancode];

    if (name)
        return name;
    else
        return "";
}

const char *
SDL_GetKeyName(SDLKey key)
{
    static char name[8];
    char *end;

    if (key & SDLK_SCANCODE_MASK) {
        return
            SDL_GetScancodeName((SDL_scancode) (key & ~SDLK_SCANCODE_MASK));
    }

    switch (key) {
    case SDLK_RETURN:
        return SDL_GetScancodeName(SDL_SCANCODE_RETURN);
    case SDLK_ESCAPE:
        return SDL_GetScancodeName(SDL_SCANCODE_ESCAPE);
    case SDLK_BACKSPACE:
        return SDL_GetScancodeName(SDL_SCANCODE_BACKSPACE);
    case SDLK_TAB:
        return SDL_GetScancodeName(SDL_SCANCODE_TAB);
    case SDLK_SPACE:
        return SDL_GetScancodeName(SDL_SCANCODE_SPACE);
    case SDLK_DELETE:
        return SDL_GetScancodeName(SDL_SCANCODE_DELETE);
    default:
        /* Unaccented letter keys on latin keyboards are normally
           labeled in upper case (and probably on others like Greek or
           Cyrillic too, so if you happen to know for sure, please
           adapt this). */
        if (key >= 'a' && key <= 'z') {
            key -= 32;
        }

        end = SDL_UCS4ToUTF8((Uint32) key, name);
        *end = '\0';
        return name;
    }
}

/* vi: set ts=4 sw=4 expandtab: */