text: /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "SDL_config.h"
  
  /* General keyboard handling code for SDL */
  
  #include "SDL_timer.h"
  #include "SDL_events.h"
  #include "SDL_events_c.h"
  #include "../video/SDL_sysvideo.h"
  
  
  /* #define DEBUG_KEYBOARD */
  
  /* Global keyboard information */
  
  typedef struct SDL_Keyboard SDL_Keyboard;
  
  struct SDL_Keyboard
  {
      /* Data common to all keyboards */
      SDL_Window *focus;
      Uint16 modstate;
      Uint8 keystate[SDL_NUM_SCANCODES];
      SDL_Keycode keymap[SDL_NUM_SCANCODES];
  };
  
  static SDL_Keyboard SDL_keyboard;
  
  static const SDL_Keycode 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() */
  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)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      /* Set the default keymap */
      SDL_memcpy(keyboard->keymap, SDL_default_keymap, sizeof(SDL_default_keymap));
      return (0);
  }
  
  void
  SDL_ResetKeyboard(void)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
      SDL_Scancode scancode;
  
  #ifdef DEBUG_KEYBOARD
      printf("Resetting keyboard\n");
  #endif
      for (scancode = 0; scancode < SDL_NUM_SCANCODES; ++scancode) {
          if (keyboard->keystate[scancode] == SDL_PRESSED) {
              SDL_SendKeyboardKey(SDL_RELEASED, scancode);
          }
      }
  }
  
  void
  SDL_GetDefaultKeymap(SDL_Keycode * keymap)
  {
      SDL_memcpy(keymap, SDL_default_keymap, sizeof(SDL_default_keymap));
  }
  
  void
  SDL_SetKeymap(int start, SDL_Keycode * keys, int length)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      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;
  }
  
  SDL_Window *
  SDL_GetKeyboardFocus(void)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      return keyboard->focus;
  }
  
  void
  SDL_SetKeyboardFocus(SDL_Window * window)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  printf("SDL_SetKeyboardFocus(SDL_Window * window) %p\n",window); 
      if (keyboard->focus && !window) {
          /* We won't get anymore keyboard messages, so reset keyboard state */
          SDL_ResetKeyboard();
      }
  printf("SDL_SetKeyboardFocus(SDL_Window * window)  focus %p\n",keyboard->focus); 
  
      /* See if the current window has lost focus */
      if (keyboard->focus && keyboard->focus != window) {
          SDL_SendWindowEvent(keyboard->focus, SDL_WINDOWEVENT_FOCUS_LOST,
                              0, 0);
  
          /* Ensures IME compositions are committed */
          if (SDL_EventState(SDL_TEXTINPUT, SDL_QUERY)) {
              SDL_VideoDevice *video = SDL_GetVideoDevice();
              if (video && video->StopTextInput) {
                  video->StopTextInput(video);
              }
          }
      }
  
      keyboard->focus = window;
  
      if (keyboard->focus) {
  printf("Sending window focus \n");      
          SDL_SendWindowEvent(keyboard->focus, SDL_WINDOWEVENT_FOCUS_GAINED,
                              0, 0);
  
          if (SDL_EventState(SDL_TEXTINPUT, SDL_QUERY)) {
              SDL_VideoDevice *video = SDL_GetVideoDevice();
              if (video && video->StartTextInput) {
                  video->StartTextInput(video);
              }
          }
      }
  }
  
  int
  SDL_SendKeyboardKey(Uint8 state, SDL_Scancode scancode)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
      int posted;
      Uint16 modstate;
      Uint32 type;
      Uint8 repeat;
  
      if (!scancode) {
          return 0;
      }
  #ifdef DEBUG_KEYBOARD
      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 */
      repeat = (state && keyboard->keystate[scancode]);
      if (keyboard->keystate[scancode] == state && !repeat) {
  #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_GetEventState(type) == SDL_ENABLE) {
          SDL_Event event;
          event.key.type = type;
          event.key.state = state;
          event.key.repeat = repeat;
          event.key.keysym.scancode = scancode;
          event.key.keysym.sym = keyboard->keymap[scancode];
          event.key.keysym.mod = modstate;
          event.key.windowID = keyboard->focus ? keyboard->focus->id : 0;
          posted = (SDL_PushEvent(&event) > 0);
      }
      return (posted);
  }
  
  int
  SDL_SendKeyboardText(const char *text)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
      int posted;
  
      /* Don't post text events for unprintable characters */
      if ((unsigned char)*text < ' ' || *text == 127) {
          return 0;
      }
  
      /* Post the event, if desired */
      posted = 0;
      if (SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE) {
          SDL_Event event;
          event.text.type = SDL_TEXTINPUT;
          event.text.windowID = keyboard->focus ? keyboard->focus->id : 0;
          SDL_utf8strlcpy(event.text.text, text, SDL_arraysize(event.text.text));
          posted = (SDL_PushEvent(&event) > 0);
      }
      return (posted);
  }
  
  int
  SDL_SendEditingText(const char *text, int start, int length)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
      int posted;
  
      /* Post the event, if desired */
      posted = 0;
      if (SDL_GetEventState(SDL_TEXTEDITING) == SDL_ENABLE) {
          SDL_Event event;
          event.edit.type = SDL_TEXTEDITING;
          event.edit.windowID = keyboard->focus ? keyboard->focus->id : 0;
          event.edit.start = start;
          event.edit.length = length;
          SDL_utf8strlcpy(event.edit.text, text, SDL_arraysize(event.edit.text));
          posted = (SDL_PushEvent(&event) > 0);
      }
      return (posted);
  }
  
  void
  SDL_KeyboardQuit(void)
  {
  }
  
  const Uint8 *
  SDL_GetKeyboardState(int *numkeys)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      if (numkeys != (int *) 0) {
          *numkeys = SDL_NUM_SCANCODES;
      }
      return keyboard->keystate;
  }
  
  SDL_Keymod
  SDL_GetModState(void)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      return keyboard->modstate;
  }
  
  void
  SDL_SetModState(SDL_Keymod modstate)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      keyboard->modstate = modstate;
  }
  
  SDL_Keycode
  SDL_GetKeyFromScancode(SDL_Scancode scancode)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
  
      if (scancode < SDL_SCANCODE_UNKNOWN || scancode >= SDL_NUM_SCANCODES) {
            SDL_InvalidParamError("scancode");
            return 0;
      }
  
      return keyboard->keymap[scancode];
  }
  
  SDL_Scancode
  SDL_GetScancodeFromKey(SDL_Keycode key)
  {
      SDL_Keyboard *keyboard = &SDL_keyboard;
      SDL_Scancode scancode;
  
      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;
      if (scancode < SDL_SCANCODE_UNKNOWN || scancode >= SDL_NUM_SCANCODES) {
            SDL_InvalidParamError("scancode");
            return "";
      }
  
      name = SDL_scancode_names[scancode];
      if (name)
          return name;
      else
          return "";
  }
  
  SDL_Scancode SDL_GetScancodeFromName(const char *name)
  {
      int i;
  
      if (!name || !*name) {
              SDL_InvalidParamError("name");
          return SDL_SCANCODE_UNKNOWN;
      }
  
      for (i = 0; i < SDL_arraysize(SDL_scancode_names); ++i) {
          if (!SDL_scancode_names[i]) {
              continue;
          }
          if (SDL_strcasecmp(name, SDL_scancode_names[i]) == 0) {
              return (SDL_Scancode)i;
          }
      }
  
      SDL_InvalidParamError("name");
      return SDL_SCANCODE_UNKNOWN;
  }
  
  const char *
  SDL_GetKeyName(SDL_Keycode 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;
      }
  }
  
  SDL_Keycode
  SDL_GetKeyFromName(const char *name)
  {
      SDL_Keycode key;
  
          /* Check input */
          if (name == NULL) return SDLK_UNKNOWN;
  
      /* If it's a single UTF-8 character, then that's the keycode itself */
      key = *(const unsigned char *)name;
      if (key >= 0xF0) {
          if (SDL_strlen(name) == 4) {
              int i = 0;
              key  = (Uint16)(name[i]&0x07) << 18;
              key |= (Uint16)(name[++i]&0x3F) << 12;
              key |= (Uint16)(name[++i]&0x3F) << 6;
              key |= (Uint16)(name[++i]&0x3F);
              return key;
          }
          return SDLK_UNKNOWN;
      } else if (key >= 0xE0) {
          if (SDL_strlen(name) == 3) {
              int i = 0;
              key  = (Uint16)(name[i]&0x0F) << 12;
              key |= (Uint16)(name[++i]&0x3F) << 6;
              key |= (Uint16)(name[++i]&0x3F);
              return key;
          }
          return SDLK_UNKNOWN;
      } else if (key >= 0xC0) {
          if (SDL_strlen(name) == 2) {
              int i = 0;
              key  = (Uint16)(name[i]&0x1F) << 6;
              key |= (Uint16)(name[++i]&0x3F);
              return key;
          }
          return SDLK_UNKNOWN;
      } else {
          if (SDL_strlen(name) == 1) {
              if (key >= 'A' && key <= 'Z') {
                  key += 32;
              }
              return key;
          }
  
          /* Get the scancode for this name, and the associated keycode */
          return SDL_default_keymap[SDL_GetScancodeFromName(name)];
      }
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  