contrib/ncurses/ncurses/fifo_defs.h

   1 /****************************************************************************
   2  * Copyright (c) 1998-2008,2012 Free Software Foundation, Inc.              *
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  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  ****************************************************************************/
  33
  34 /*
  35  * Common macros for lib_getch.c, lib_ungetch.c
  36  *
  37  * $Id: fifo_defs.h,v 1.7 2012/08/04 15:59:17 tom Exp $
  38  */
  39
  40 #ifndef FIFO_DEFS_H
  41 #define FIFO_DEFS_H 1
  42
  43 #define head    sp->_fifohead
  44 #define tail    sp->_fifotail
  45 /* peek points to next uninterpreted character */
  46 #define peek    sp->_fifopeek
  47
  48 #define h_inc() { \
  49             (head >= FIFO_SIZE-1) \
  50                 ? head = 0 \
  51                 : head++; \
  52             if (head == tail) \
  53                 head = -1, tail = 0; \
  54         }
  55 #define h_dec() { \
  56             (head <= 0) \
  57                 ? head = FIFO_SIZE-1 \
  58                 : head--; \
  59             if (head == tail) \
  60                 tail = -1; \
  61         }
  62 #define t_inc() { \
  63             (tail >= FIFO_SIZE-1) \
  64                 ? tail = 0 \
  65                 : tail++; \
  66             if (tail == head) \
  67                 tail = -1; \
  68             }
  69 #define t_dec() { \
  70             (tail <= 0) \
  71                 ? tail = FIFO_SIZE-1 \
  72                 : tail--; \
  73             if (head == tail) \
  74                 fifo_clear(sp); \
  75             }
  76 #define p_inc() { \
  77             (peek >= FIFO_SIZE-1) \
  78                 ? peek = 0 \
  79                 : peek++; \
  80             }
  81
  82 #define cooked_key_in_fifo()    ((head >= 0) && (peek != head))
  83 #define raw_key_in_fifo()       ((head >= 0) && (peek != tail))
  84
  85 #undef HIDE_EINTR
  86
  87 #endif /* FIFO_DEFS_H */