1 /**************************************************************************** 2 * Copyright 2020 Thomas E. Dickey * 3 * Copyright 1998-2012,2016 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 32 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 33 ****************************************************************************/ 34 35 /* 36 * Common macros for lib_getch.c, lib_ungetch.c 37 * 38 * $Id: fifo_defs.h,v 1.9 2020/02/02 23:34:34 tom Exp $ 39 */ 40 41 #ifndef FIFO_DEFS_H 42 #define FIFO_DEFS_H 1 43 44 #define head sp->_fifohead 45 #define tail sp->_fifotail 46 /* peek points to next uninterpreted character */ 47 #define peek sp->_fifopeek 48 49 #define h_inc() { \ 50 (head >= FIFO_SIZE-1) \ 51 ? head = 0 \ 52 : head++; \ 53 if (head == tail) \ 54 head = -1, tail = 0; \ 55 } 56 #define h_dec() { \ 57 (head <= 0) \ 58 ? head = FIFO_SIZE-1 \ 59 : head--; \ 60 if (head == tail) \ 61 tail = -1; \ 62 } 63 #define t_inc() { \ 64 (tail >= FIFO_SIZE-1) \ 65 ? tail = 0 \ 66 : tail++; \ 67 if (tail == head) \ 68 tail = -1; \ 69 } 70 #define t_dec() { \ 71 (tail <= 0) \ 72 ? tail = FIFO_SIZE-1 \ 73 : tail--; \ 74 if (head == tail) \ 75 fifo_clear(sp); \ 76 } 77 #define p_inc() { \ 78 (peek >= FIFO_SIZE-1) \ 79 ? peek = 0 \ 80 : peek++; \ 81 } 82 83 #define cooked_key_in_fifo() ((head >= 0) && (peek != head)) 84 #define raw_key_in_fifo() ((head >= 0) && (peek != tail)) 85 86 #endif /* FIFO_DEFS_H */ 87