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| Rev | Author | Line No. | Line |
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| 1339 | cejka | 1 | /* |
| 2 | * Copyright (C) 2006 Josef Cejka |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <key_buffer.h> |
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| 30 | #include <fifo.h> |
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| 31 | |||
| 32 | #define KBD_BUFFER_SIZE 128 |
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| 33 | |||
| 34 | FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); |
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| 35 | fifo_count_t buffer_items; |
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| 36 | |||
| 37 | void key_buffer_free(void) |
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| 38 | { |
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| 39 | buffer_items = 0; |
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| 40 | buffer.head = buffer.tail = 0; |
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| 41 | } |
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| 42 | |||
| 43 | void key_buffer_init(void) |
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| 44 | { |
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| 45 | key_buffer_free(); |
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| 46 | } |
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| 47 | |||
| 48 | /** |
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| 49 | * @return empty buffer space |
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| 50 | */ |
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| 51 | int key_buffer_available(void) |
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| 52 | { |
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| 53 | return KBD_BUFFER_SIZE - buffer_items; |
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| 54 | } |
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| 55 | |||
| 56 | void key_buffer_push(char key) |
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| 57 | { |
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| 58 | /* TODO: somebody may wait for key */ |
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| 59 | if (buffer_items < KBD_BUFFER_SIZE) { |
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| 60 | fifo_push(buffer, key); |
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| 61 | buffer_items++; |
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| 62 | } |
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| 63 | } |
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| 64 | |||
| 65 | /** Pop character from buffer. |
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| 66 | * @param c |
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| 67 | * @return zero on empty buffer, nonzero else |
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| 68 | */ |
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| 69 | int key_buffer_pop(char *c) |
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| 70 | { |
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| 71 | if (buffer_items > 0) { |
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| 72 | buffer_items--; |
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| 73 | *c = fifo_pop(buffer); |
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| 74 | return 1; |
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| 75 | } |
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| 76 | return 0; |
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| 77 | } |
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| 78 | |||
| 79 |