1 /* $OpenBSD: fifo_defs.h,v 1.4 2023/10/17 09:52:08 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright 2020 Thomas E. Dickey * 5 * Copyright 1998-2012,2016 Free Software Foundation, Inc. * 6 * * 7 * Permission is hereby granted, free of charge, to any person obtaining a * 8 * copy of this software and associated documentation files (the * 9 * "Software"), to deal in the Software without restriction, including * 10 * without limitation the rights to use, copy, modify, merge, publish, * 11 * distribute, distribute with modifications, sublicense, and/or sell * 12 * copies of the Software, and to permit persons to whom the Software is * 13 * furnished to do so, subject to the following conditions: * 14 * * 15 * The above copyright notice and this permission notice shall be included * 16 * in all copies or substantial portions of the Software. * 17 * * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 25 * * 26 * Except as contained in this notice, the name(s) of the above copyright * 27 * holders shall not be used in advertising or otherwise to promote the * 28 * sale, use or other dealings in this Software without prior written * 29 * authorization. * 30 ****************************************************************************/ 31 32 /**************************************************************************** 33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 34 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 35 ****************************************************************************/ 36 37 /* 38 * Common macros for lib_getch.c, lib_ungetch.c 39 * 40 * $Id: fifo_defs.h,v 1.4 2023/10/17 09:52:08 nicm Exp $ 41 */ 42 43 #ifndef FIFO_DEFS_H 44 #define FIFO_DEFS_H 1 45 46 #define head sp->_fifohead 47 #define tail sp->_fifotail 48 /* peek points to next uninterpreted character */ 49 #define peek sp->_fifopeek 50 51 #define h_inc() { \ 52 (head >= FIFO_SIZE-1) \ 53 ? head = 0 \ 54 : head++; \ 55 if (head == tail) \ 56 head = -1, tail = 0; \ 57 } 58 #define h_dec() { \ 59 (head <= 0) \ 60 ? head = FIFO_SIZE-1 \ 61 : head--; \ 62 if (head == tail) \ 63 tail = -1; \ 64 } 65 #define t_inc() { \ 66 (tail >= FIFO_SIZE-1) \ 67 ? tail = 0 \ 68 : tail++; \ 69 if (tail == head) \ 70 tail = -1; \ 71 } 72 #define t_dec() { \ 73 (tail <= 0) \ 74 ? tail = FIFO_SIZE-1 \ 75 : tail--; \ 76 if (head == tail) \ 77 fifo_clear(sp); \ 78 } 79 #define p_inc() { \ 80 (peek >= FIFO_SIZE-1) \ 81 ? peek = 0 \ 82 : peek++; \ 83 } 84 85 #define cooked_key_in_fifo() ((head >= 0) && (peek != head)) 86 #define raw_key_in_fifo() ((head >= 0) && (peek != tail)) 87 88 #endif /* FIFO_DEFS_H */ 89