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  1. /*
  2.  * Copyright (c) 2006 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup kbdgen
  30.  * @brief   HelenOS generic uspace keyboard handler.
  31.  * @ingroup  kbd
  32.  * @{
  33.  */
  34. /** @file
  35.  */
  36.  
  37. #ifndef __KEY_BUFFER_H__
  38. #define __KEY_BUFFER_H__
  39.  
  40. #include <sys/types.h>
  41. #include <kbd/kbd.h>
  42.  
  43. /** Size of buffer for pressed keys */
  44. #define KEYBUFFER_SIZE 128
  45.  
  46. typedef struct {
  47.     kbd_event_t fifo[KEYBUFFER_SIZE];
  48.     unsigned long head;
  49.     unsigned long tail;
  50.     unsigned long items;
  51. } keybuffer_t;
  52.  
  53. extern void keybuffer_free(keybuffer_t *);
  54. extern void keybuffer_init(keybuffer_t *);
  55. extern int keybuffer_available(keybuffer_t *);
  56. extern int keybuffer_empty(keybuffer_t *);
  57. extern void keybuffer_push(keybuffer_t *, const kbd_event_t *);
  58. extern int keybuffer_pop(keybuffer_t *, kbd_event_t *);
  59.  
  60. #endif
  61.  
  62. /**
  63.  * @}
  64.  */
  65.  
  66.