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1339 | cejka | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2006 Josef Cejka |
1339 | cejka | 3 | * All rights reserved. |
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 | |||
1649 | cejka | 29 | /** @addtogroup kbdgen |
4462 | decky | 30 | * @brief HelenOS generic uspace keyboard handler. |
31 | * @ingroup kbd |
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1649 | cejka | 32 | * @{ |
4462 | decky | 33 | */ |
1649 | cejka | 34 | /** @file |
35 | */ |
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4462 | decky | 36 | |
37 | #include <keybuffer.h> |
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1476 | cejka | 38 | #include <futex.h> |
1339 | cejka | 39 | |
1476 | cejka | 40 | atomic_t keybuffer_futex = FUTEX_INITIALIZER; |
41 | |||
1344 | cejka | 42 | /** Clear key buffer. |
43 | */ |
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3905 | svoboda | 44 | void keybuffer_free(keybuffer_t *keybuffer) |
1339 | cejka | 45 | { |
1476 | cejka | 46 | futex_down(&keybuffer_futex); |
47 | keybuffer->head = 0; |
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48 | keybuffer->tail = 0; |
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1451 | cejka | 49 | keybuffer->items = 0; |
1476 | cejka | 50 | futex_up(&keybuffer_futex); |
1339 | cejka | 51 | } |
52 | |||
1344 | cejka | 53 | /** Key buffer initialization. |
54 | * |
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55 | */ |
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1451 | cejka | 56 | void keybuffer_init(keybuffer_t *keybuffer) |
1339 | cejka | 57 | { |
1451 | cejka | 58 | keybuffer_free(keybuffer); |
1339 | cejka | 59 | } |
60 | |||
1344 | cejka | 61 | /** Get free space in buffer. |
4462 | decky | 62 | * |
63 | * This function is useful for processing some scancodes that are translated |
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1344 | cejka | 64 | * to more than one character. |
4462 | decky | 65 | * |
1339 | cejka | 66 | * @return empty buffer space |
4462 | decky | 67 | * |
1339 | cejka | 68 | */ |
4462 | decky | 69 | size_t keybuffer_available(keybuffer_t *keybuffer) |
1339 | cejka | 70 | { |
1451 | cejka | 71 | return KEYBUFFER_SIZE - keybuffer->items; |
1339 | cejka | 72 | } |
73 | |||
1344 | cejka | 74 | /** |
4462 | decky | 75 | * |
1344 | cejka | 76 | * @return nonzero, if buffer is not empty. |
4462 | decky | 77 | * |
1344 | cejka | 78 | */ |
4462 | decky | 79 | bool keybuffer_empty(keybuffer_t *keybuffer) |
1344 | cejka | 80 | { |
1451 | cejka | 81 | return (keybuffer->items == 0); |
1344 | cejka | 82 | } |
83 | |||
3905 | svoboda | 84 | /** Push key event to key buffer. |
85 | * |
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86 | * If the buffer is full, the event is ignored. |
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87 | * |
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4462 | decky | 88 | * @param keybuffer The keybuffer. |
89 | * @param ev The event to push. |
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90 | * |
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1344 | cejka | 91 | */ |
4462 | decky | 92 | void keybuffer_push(keybuffer_t *keybuffer, const console_event_t *ev) |
1339 | cejka | 93 | { |
1476 | cejka | 94 | futex_down(&keybuffer_futex); |
4462 | decky | 95 | |
1451 | cejka | 96 | if (keybuffer->items < KEYBUFFER_SIZE) { |
3905 | svoboda | 97 | keybuffer->fifo[keybuffer->tail] = *ev; |
1476 | cejka | 98 | keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE; |
1451 | cejka | 99 | keybuffer->items++; |
1339 | cejka | 100 | } |
4462 | decky | 101 | |
1476 | cejka | 102 | futex_up(&keybuffer_futex); |
1339 | cejka | 103 | } |
104 | |||
3905 | svoboda | 105 | /** Pop event from buffer. |
106 | * |
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4462 | decky | 107 | * @param edst Pointer to where the event should be saved. |
108 | * |
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109 | * @return True if an event was popped. |
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110 | * |
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1339 | cejka | 111 | */ |
4462 | decky | 112 | bool keybuffer_pop(keybuffer_t *keybuffer, console_event_t *edst) |
1339 | cejka | 113 | { |
1476 | cejka | 114 | futex_down(&keybuffer_futex); |
4462 | decky | 115 | |
1451 | cejka | 116 | if (keybuffer->items > 0) { |
117 | keybuffer->items--; |
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4462 | decky | 118 | *edst = (keybuffer->fifo[keybuffer->head]); |
1476 | cejka | 119 | keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE; |
120 | futex_up(&keybuffer_futex); |
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4462 | decky | 121 | |
122 | return true; |
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1339 | cejka | 123 | } |
4462 | decky | 124 | |
1476 | cejka | 125 | futex_up(&keybuffer_futex); |
4462 | decky | 126 | |
127 | return false; |
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1339 | cejka | 128 | } |
129 | |||
1649 | cejka | 130 | /** |
131 | * @} |
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4462 | decky | 132 | */ |