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/** Push key to key buffer.
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/** Push key to key buffer.
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 * If buffer is full, character is ignored.
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 * If buffer is full, character is ignored.
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 * @param key code of stored key
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 * @param key code of stored key
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 */
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 */
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void keybuffer_push(keybuffer_t *keybuffer, char key)
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void keybuffer_push(keybuffer_t *keybuffer, int key)
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{
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{
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    futex_down(&keybuffer_futex);
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    futex_down(&keybuffer_futex);
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    if (keybuffer->items < KEYBUFFER_SIZE) {
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    if (keybuffer->items < KEYBUFFER_SIZE) {
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        keybuffer->fifo[keybuffer->tail] = key;
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        keybuffer->fifo[keybuffer->tail] = key;
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        keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE;
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        keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE;
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/** Pop character from buffer.
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/** Pop character from buffer.
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 * @param c pointer to space where to store character from buffer.
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 * @param c pointer to space where to store character from buffer.
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 * @return zero on empty buffer, nonzero else
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 * @return zero on empty buffer, nonzero else
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 */
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 */
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int keybuffer_pop(keybuffer_t *keybuffer, char *c)
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int keybuffer_pop(keybuffer_t *keybuffer, int *c)
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{
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{
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    futex_down(&keybuffer_futex);
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    futex_down(&keybuffer_futex);
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    if (keybuffer->items > 0) {
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    if (keybuffer->items > 0) {
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        keybuffer->items--;
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        keybuffer->items--;
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        *c = keybuffer->fifo[keybuffer->head];
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        *c = (keybuffer->fifo[keybuffer->head]) ;
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        keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE;
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        keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE;
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        futex_up(&keybuffer_futex);
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        futex_up(&keybuffer_futex);
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        return 1;
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        return 1;
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    }
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    }
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    futex_up(&keybuffer_futex);
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    futex_up(&keybuffer_futex);