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