1/****************************************************************************
2 * Copyright (c) 1998-2008,2012 Free Software Foundation, Inc.              *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
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 */
88