org.handhelds.familiar/packages/qte/qte-2.3.10/switches.h

   1 /*
   2  *  linux/include/linux/switches.h
   3  *
   4  *  Copyright (C) 2000 John Dorsey
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  23 October 2000 - created.
  11  */
  12
  13 #if !defined(_LINUX_SWITCHES_H)
  14 #define _LINUX_SWITCHES_H
  15
  16 #define SWITCHES_MASK_SIZE  (128)
  17
  18 typedef unsigned long switches_bitfield;
  19
  20 #define SWITCHES_BITS            (sizeof(switches_bitfield) * 8)
  21 #define SWITCHES_NUM_FIELDS      (SWITCHES_MASK_SIZE /  SWITCHES_BITS)
  22 #define SWITCHES_FIELD_SELECT(i) ((i) / SWITCHES_BITS)
  23 #define SWITCHES_FIELD_MASK(i)   ((switches_bitfield)(1 << (i) % \
  24                                   SWITCHES_BITS))
  25
  26 typedef struct switches_mask_t {
  27         unsigned int count;
  28         switches_bitfield events[SWITCHES_NUM_FIELDS];
  29         switches_bitfield states[SWITCHES_NUM_FIELDS];
  30 } switches_mask_t;
  31
  32 #define SWITCHES_ZERO(m) \
  33 do { \
  34         unsigned int sz_i; \
  35         (m)->count = 0; \
  36         for(sz_i = 0; sz_i < SWITCHES_NUM_FIELDS; ++sz_i) \
  37                 (m)->events[sz_i] = (m)->states[sz_i] = 0; \
  38 } while (0)
  39
  40 /* `s' is the state of the switch, either 0 or non-zero: */
  41 #define SWITCHES_SET(m, i, s) \
  42 do { \
  43         ((m)->events[SWITCHES_FIELD_SELECT((i))] |= \
  44          SWITCHES_FIELD_MASK((i))); \
  45         if(s) \
  46                 ((m)->states[SWITCHES_FIELD_SELECT((i))] |= \
  47                  SWITCHES_FIELD_MASK((i))); \
  48         else \
  49                 ((m)->states[SWITCHES_FIELD_SELECT((i))] &= \
  50                  ~SWITCHES_FIELD_MASK((i))); \
  51         ++((m)->count); \
  52 } while (0)
  53
  54 /* Should only use to clear an event set by SWITCHES_SET(): */
  55 #define SWITCHES_CLEAR(m, i) \
  56 do { \
  57         ((m)->events[SWITCHES_FIELD_SELECT((i))] &= \
  58          ~SWITCHES_FIELD_MASK((i))); \
  59         ((m)->states[SWITCHES_FIELD_SELECT((i))] &= \
  60          ~SWITCHES_FIELD_MASK((i))); \
  61         --((m)->count); \
  62 }
  63
  64 #define SWITCHES_COUNT(m) ((m)->count)
  65
  66 /* Returns 0 or non-zero: */
  67 #define SWITCHES_EVENT(m, i) \
  68 ((m)->events[SWITCHES_FIELD_SELECT((i))] & SWITCHES_FIELD_MASK((i)))
  69
  70 /* Returns 0 or non-zero: */
  71 #define SWITCHES_STATE(m, i) \
  72 ((m)->states[SWITCHES_FIELD_SELECT((i))] & SWITCHES_FIELD_MASK((i)))
  73
  74 #endif  /* !defined(_LINUX_SWITCHES_H) */