1/**************************************************************************** 2 * Copyright (c) 1998-2001,2002 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** lib_ungetch.c 36** 37** The routine ungetch(). 38** 39*/ 40 41#include <curses.priv.h> 42 43MODULE_ID("$Id: lib_ungetch.c,v 1.8 2002/08/24 22:08:48 tom Exp $") 44 45#include <fifo_defs.h> 46 47#ifdef TRACE 48NCURSES_EXPORT(void) 49_nc_fifo_dump(void) 50{ 51 int i; 52 T(("head = %d, tail = %d, peek = %d", head, tail, peek)); 53 for (i = 0; i < 10; i++) 54 T(("char %d = %s", i, _tracechar(SP->_fifo[i]))); 55} 56#endif /* TRACE */ 57 58NCURSES_EXPORT(int) 59ungetch(int ch) 60{ 61 T((T_CALLED("ungetch(%s)"), _tracechar(ch))); 62 63 if (tail == -1) 64 returnCode(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 %s ok", _tracechar(ch))); 74#ifdef TRACE 75 if (_nc_tracing & TRACE_IEVENT) 76 _nc_fifo_dump(); 77#endif 78 returnCode(OK); 79} 80