contrib/ncurses-5.4/ncurses/fifo_defs.h

   1 /****************************************************************************
   2  * Copyright (c) 1998,2002 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 1.4 2002/03/16 20:47:50 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() { head == FIFO_SIZE-1 ? head = 0 : head++; if (head == tail) head = -1, tail = 0;}
  49 #define h_dec() { head == 0 ? head = FIFO_SIZE-1 : head--; if (head == tail) tail = -1;}
  50 #define t_inc() { tail == FIFO_SIZE-1 ? tail = 0 : tail++; if (tail == head) tail = -1;}
  51 #define t_dec() { tail == 0 ? tail = FIFO_SIZE-1 : tail--; if (head == tail) fifo_clear();}
  52 #define p_inc() { peek == FIFO_SIZE-1 ? peek = 0 : peek++;}
  53
  54 #define cooked_key_in_fifo()    ((head != -1) && (peek != head))
  55 #define raw_key_in_fifo()       ((head != -1) && (peek != tail))
  56
  57 #undef HIDE_EINTR
  58
  59 #endif /* FIFO_DEFS_H */