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/* $OpenBSD: fifo_defs.h,v 1.4 2023/10/17 09:52:08 nicm Exp $ */
/****************************************************************************
* Copyright 2020 Thomas E. Dickey *
* Copyright 1998-2012,2016 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
****************************************************************************/
/*
* Common macros for lib_getch.c, lib_ungetch.c
*
* $Id: fifo_defs.h,v 1.4 2023/10/17 09:52:08 nicm Exp $
*/
#ifndef FIFO_DEFS_H
#define FIFO_DEFS_H 1
#define head sp->_fifohead
#define tail sp->_fifotail
/* peek points to next uninterpreted character */
#define peek sp->_fifopeek
#define h_inc() { \
(head >= FIFO_SIZE-1) \
? head = 0 \
: head++; \
if (head == tail) \
head = -1, tail = 0; \
}
#define h_dec() { \
(head <= 0) \
? head = FIFO_SIZE-1 \
: head--; \
if (head == tail) \
tail = -1; \
}
#define t_inc() { \
(tail >= FIFO_SIZE-1) \
? tail = 0 \
: tail++; \
if (tail == head) \
tail = -1; \
}
#define t_dec() { \
(tail <= 0) \
? tail = FIFO_SIZE-1 \
: tail--; \
if (head == tail) \
fifo_clear(sp); \
}
#define p_inc() { \
(peek >= FIFO_SIZE-1) \
? peek = 0 \
: peek++; \
}
#define cooked_key_in_fifo() ((head >= 0) && (peek != head))
#define raw_key_in_fifo() ((head >= 0) && (peek != tail))
#endif /* FIFO_DEFS_H */
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