/* $OpenBSD: fifo_defs.h,v 1.2 1998/07/23 21:18:17 millert Exp $ */ /**************************************************************************** * Copyright (c) 1998 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 * * $From: fifo_defs.h,v 1.2 1998/02/11 12:13:56 tom 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();} #define p_inc() { peek == FIFO_SIZE-1 ? peek = 0 : peek++;} #define cooked_key_in_fifo() (head!=-1 && peek!=head) #define raw_key_in_fifo() (head!=-1 && peek!=tail) #undef HIDE_EINTR #endif /* FIFO_DEFS_H */