fifo_defs.h revision 50276 
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2 * Copyright (c) 1998 Free Software Foundation, Inc.                        *
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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 1.2 1998/02/11 12:13:56 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 */
60