1 /* $OpenBSD: lib_ungetch.c,v 1.2 2001/01/22 18:01:47 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998,2000 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 ** lib_ungetch.c 38 ** 39 ** The routine ungetch(). 40 ** 41 */ 42 43 #include <curses.priv.h> 44 45 MODULE_ID("$From: lib_ungetch.c,v 1.4 2000/12/10 02:43:27 tom Exp $") 46 47 #include <fifo_defs.h> 48 49 #ifdef TRACE 50 NCURSES_EXPORT(void) 51 _nc_fifo_dump(void) 52 { 53 int i; 54 T(("head = %d, tail = %d, peek = %d", head, tail, peek)); 55 for (i = 0; i < 10; i++) 56 T(("char %d = %s", i, _trace_key(SP->_fifo[i]))); 57 } 58 #endif /* TRACE */ 59 60 NCURSES_EXPORT(int) 61 ungetch(int ch) 62 { 63 if (tail == -1) 64 return ERR; 65 if (head == -1) { 66 head = 0; 67 t_inc() 68 peek = tail; /* no raw keys */ 69 } else 70 h_dec(); 71 72 SP->_fifo[head] = ch; 73 T(("ungetch %#x ok", ch)); 74 #ifdef TRACE 75 if (_nc_tracing & TRACE_IEVENT) 76 _nc_fifo_dump(); 77 #endif 78 return OK; 79 } 80