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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. #ifndef __KEY_BUFFER_H__
  30. #define __KEY_BUFFER_H__
  31.  
  32. #include <types.h>
  33.  
  34. /** Size of buffer for pressed keys */
  35. #define KEYBUFFER_SIZE 128
  36.  
  37. typedef struct {
  38.     char fifo[KEYBUFFER_SIZE];
  39.     unsigned long head;
  40.     unsigned long tail;
  41.     unsigned long items;
  42. } keybuffer_t;
  43.  
  44. void keybuffer_free(keybuffer_t *keybuffer);
  45. void keybuffer_init(keybuffer_t *keybuffer);
  46. int keybuffer_available(keybuffer_t *keybuffer);
  47. int keybuffer_empty(keybuffer_t *keybuffer);
  48. void keybuffer_push(keybuffer_t *keybuffer, char key);
  49. int keybuffer_pop(keybuffer_t *keybuffer, char *c);
  50.  
  51. #endif
  52.  
  53.