rts/src/keyboard/sdl-1.2/src/keyboard.c

#include <keyboard.h>
#include <keyboard_key.h>
#include <SDL.h>
#include <stdio.h>

static void append_key(const enum keyboard_key key, struct keyboard *const k)
{
    struct keyboard_combo *const c = &k->combo;

    for (size_t i = 0; i < sizeof c->keys / sizeof *c->keys; i++)
    {
        enum keyboard_key *const sel = &c->keys[i];

        if (*sel == KEYBOARD_KEY_NONE)
        {
            *sel = key;
            break;
        }
    }
}

static void remove_key(const enum keyboard_key key, struct keyboard *const k)
{
    struct keyboard_combo *const c = &k->combo;

    for (size_t i = 0; i < sizeof c->keys / sizeof *c->keys; i++)
    {
        enum keyboard_key *const sel = &c->keys[i];

        if (*sel == key)
            *sel = KEYBOARD_KEY_NONE;
    }
}

static void key_event(const SDL_KeyboardEvent *const ev,
    struct keyboard *const k)
{
    static const struct keymap
    {
        enum keyboard_key key;
        SDLKey sdl_key;
    } keymap[] =
    {
        {.key = KEYBOARD_KEY_BACKSPACE, .sdl_key = SDLK_BACKSPACE},
        {.key = KEYBOARD_KEY_LEFT, .sdl_key = SDLK_LEFT},
        {.key = KEYBOARD_KEY_RIGHT, .sdl_key = SDLK_RIGHT},
        {.key = KEYBOARD_KEY_UP, .sdl_key = SDLK_UP},
        {.key = KEYBOARD_KEY_DOWN, .sdl_key = SDLK_DOWN},
        {.key = KEYBOARD_KEY_LCTRL, .sdl_key = SDLK_LCTRL},
        {.key = KEYBOARD_KEY_RCTRL, .sdl_key = SDLK_RCTRL},
        {.key = KEYBOARD_KEY_LSHIFT, .sdl_key = SDLK_LSHIFT},
        {.key = KEYBOARD_KEY_RSHIFT, .sdl_key = SDLK_RSHIFT},
        {.key = KEYBOARD_KEY_ESC, .sdl_key = SDLK_ESCAPE},
        {.key = KEYBOARD_KEY_F11, .sdl_key = SDLK_F11},
        {.key = KEYBOARD_KEY_SPACE, .sdl_key = SDLK_SPACE},
        {.key = KEYBOARD_KEY_MINUS, .sdl_key = SDLK_MINUS},
        {.key = KEYBOARD_KEY_A, .sdl_key = SDLK_a},
        {.key = KEYBOARD_KEY_B, .sdl_key = SDLK_b},
        {.key = KEYBOARD_KEY_C, .sdl_key = SDLK_c},
        {.key = KEYBOARD_KEY_D, .sdl_key = SDLK_d},
        {.key = KEYBOARD_KEY_E, .sdl_key = SDLK_e},
        {.key = KEYBOARD_KEY_F, .sdl_key = SDLK_f},
        {.key = KEYBOARD_KEY_G, .sdl_key = SDLK_g},
        {.key = KEYBOARD_KEY_H, .sdl_key = SDLK_h},
        {.key = KEYBOARD_KEY_I, .sdl_key = SDLK_i},
        {.key = KEYBOARD_KEY_J, .sdl_key = SDLK_j},
        {.key = KEYBOARD_KEY_K, .sdl_key = SDLK_k},
        {.key = KEYBOARD_KEY_L, .sdl_key = SDLK_l},
        {.key = KEYBOARD_KEY_M, .sdl_key = SDLK_m},
        {.key = KEYBOARD_KEY_N, .sdl_key = SDLK_n},
        {.key = KEYBOARD_KEY_O, .sdl_key = SDLK_o},
        {.key = KEYBOARD_KEY_P, .sdl_key = SDLK_p},
        {.key = KEYBOARD_KEY_Q, .sdl_key = SDLK_q},
        {.key = KEYBOARD_KEY_R, .sdl_key = SDLK_r},
        {.key = KEYBOARD_KEY_S, .sdl_key = SDLK_s},
        {.key = KEYBOARD_KEY_T, .sdl_key = SDLK_t},
        {.key = KEYBOARD_KEY_U, .sdl_key = SDLK_u},
        {.key = KEYBOARD_KEY_V, .sdl_key = SDLK_v},
        {.key = KEYBOARD_KEY_W, .sdl_key = SDLK_w},
        {.key = KEYBOARD_KEY_X, .sdl_key = SDLK_x},
        {.key = KEYBOARD_KEY_Y, .sdl_key = SDLK_y},
        {.key = KEYBOARD_KEY_Z, .sdl_key = SDLK_z},
        {.key = KEYBOARD_KEY_0, .sdl_key = SDLK_0},
        {.key = KEYBOARD_KEY_1, .sdl_key = SDLK_1},
        {.key = KEYBOARD_KEY_2, .sdl_key = SDLK_2},
        {.key = KEYBOARD_KEY_3, .sdl_key = SDLK_3},
        {.key = KEYBOARD_KEY_4, .sdl_key = SDLK_4},
        {.key = KEYBOARD_KEY_5, .sdl_key = SDLK_5},
        {.key = KEYBOARD_KEY_6, .sdl_key = SDLK_6},
        {.key = KEYBOARD_KEY_7, .sdl_key = SDLK_7},
        {.key = KEYBOARD_KEY_8, .sdl_key = SDLK_8},
        {.key = KEYBOARD_KEY_9, .sdl_key = SDLK_9},
        {.key = KEYBOARD_KEY_0, .sdl_key = SDLK_KP0},
        {.key = KEYBOARD_KEY_1, .sdl_key = SDLK_KP1},
        {.key = KEYBOARD_KEY_2, .sdl_key = SDLK_KP2},
        {.key = KEYBOARD_KEY_3, .sdl_key = SDLK_KP3},
        {.key = KEYBOARD_KEY_4, .sdl_key = SDLK_KP4},
        {.key = KEYBOARD_KEY_5, .sdl_key = SDLK_KP5},
        {.key = KEYBOARD_KEY_6, .sdl_key = SDLK_KP6},
        {.key = KEYBOARD_KEY_7, .sdl_key = SDLK_KP7},
        {.key = KEYBOARD_KEY_8, .sdl_key = SDLK_KP8},
        {.key = KEYBOARD_KEY_9, .sdl_key = SDLK_KP9},
        {.key = KEYBOARD_KEY_DOT, .sdl_key = SDLK_PERIOD},
        {.key = KEYBOARD_KEY_DOT, .sdl_key = SDLK_KP_PERIOD}
    };

    for (size_t i = 0; i < sizeof keymap / sizeof *keymap; i++)
    {
        const struct keymap *const km = &keymap[i];

        if (ev->keysym.sym == km->sdl_key)
        {
            if (ev->state == SDL_PRESSED)
                append_key(km->key, k);
            else
                remove_key(km->key, k);
        }
    }
}

void keyboard_update(struct keyboard *const k)
{
    SDL_Event ev;
    int n;

    k->oldcombo = k->combo;

    while ((n = SDL_PeepEvents(&ev, 1, SDL_GETEVENT,
                SDL_KEYEVENTMASK | SDL_QUITMASK)) > 0)
    {
        switch (ev.type)
        {
            case SDL_KEYDOWN:
                /* Fall through. */
            case SDL_KEYUP:
                key_event(&ev.key, k);
                break;

            case SDL_QUIT:
                append_key(KEYBOARD_KEY_EXIT, k);
                break;

            default:
                fprintf(stderr, "%s: unexpected SDL_Event %d\n",
                    __func__, ev.type);
                break;
        }
    }

    if (n < 0)
    {
        fprintf(stderr, "%s: SDL_PeepEvents: %s\n",
            __func__, SDL_GetError());
        return;
    }
}