| 0,0 → 1,79 |
|---|
| /* |
| * Copyright (C) 2006 Josef Cejka |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <key_buffer.h> |
| #include <fifo.h> |
| |
| #define KBD_BUFFER_SIZE 128 |
| |
| FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); |
| fifo_count_t buffer_items; |
| |
| void key_buffer_free(void) |
| { |
| buffer_items = 0; |
| buffer.head = buffer.tail = 0; |
| } |
| |
| void key_buffer_init(void) |
| { |
| key_buffer_free(); |
| } |
| |
| /** |
| * @return empty buffer space |
| */ |
| int key_buffer_available(void) |
| { |
| return KBD_BUFFER_SIZE - buffer_items; |
| } |
| |
| void key_buffer_push(char key) |
| { |
| /* TODO: somebody may wait for key */ |
| if (buffer_items < KBD_BUFFER_SIZE) { |
| fifo_push(buffer, key); |
| buffer_items++; |
| } |
| } |
| |
| /** Pop character from buffer. |
| * @param c |
| * @return zero on empty buffer, nonzero else |
| */ |
| int key_buffer_pop(char *c) |
| { |
| if (buffer_items > 0) { |
| buffer_items--; |
| *c = fifo_pop(buffer); |
| return 1; |
| } |
| return 0; |
| } |
| |
| |