1 /* $OpenBSD: fifo_defs.h,v 1.3 2010/01/12 23:21:59 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2002,2008 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 33 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 34 ****************************************************************************/ 35 36 /* 37 * Common macros for lib_getch.c, lib_ungetch.c 38 * 39 * $Id: fifo_defs.h,v 1.3 2010/01/12 23:21:59 nicm Exp $ 40 */ 41 42 #ifndef FIFO_DEFS_H 43 #define FIFO_DEFS_H 1 44 45 #define head sp->_fifohead 46 #define tail sp->_fifotail 47 /* peek points to next uninterpreted character */ 48 #define peek sp->_fifopeek 49 50 #define h_inc() { head == FIFO_SIZE-1 ? head = 0 : head++; if (head == tail) head = -1, tail = 0;} 51 #define h_dec() { head == 0 ? head = FIFO_SIZE-1 : head--; if (head == tail) tail = -1;} 52 #define t_inc() { tail == FIFO_SIZE-1 ? tail = 0 : tail++; if (tail == head) tail = -1;} 53 #define t_dec() { tail == 0 ? tail = FIFO_SIZE-1 : tail--; if (head == tail) fifo_clear(sp);} 54 #define p_inc() { peek == FIFO_SIZE-1 ? peek = 0 : peek++;} 55 56 #define cooked_key_in_fifo() ((head != -1) && (peek != head)) 57 #define raw_key_in_fifo() ((head != -1) && (peek != tail)) 58 59 #undef HIDE_EINTR 60 61 #endif /* FIFO_DEFS_H */ 62