1 /* $OpenBSD: lib_ungetch.c,v 1.3 2010/01/12 23:22:06 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2007,2008 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 * and: Thomas E. Dickey 1996-on * 35 ****************************************************************************/ 36 37 /* 38 ** lib_ungetch.c 39 ** 40 ** The routine ungetch(). 41 ** 42 */ 43 44 #include <curses.priv.h> 45 46 MODULE_ID("$Id: lib_ungetch.c,v 1.3 2010/01/12 23:22:06 nicm Exp $") 47 48 #include <fifo_defs.h> 49 50 #ifdef TRACE 51 NCURSES_EXPORT(void) 52 _nc_fifo_dump(SCREEN *sp) 53 { 54 int i; 55 T(("head = %d, tail = %d, peek = %d", head, tail, peek)); 56 for (i = 0; i < 10; i++) 57 T(("char %d = %s", i, _nc_tracechar(sp, sp->_fifo[i]))); 58 } 59 #endif /* TRACE */ 60 61 NCURSES_EXPORT(int) 62 _nc_ungetch(SCREEN *sp, int ch) 63 { 64 int rc = ERR; 65 66 if (tail != -1) { 67 if (head == -1) { 68 head = 0; 69 t_inc(); 70 peek = tail; /* no raw keys */ 71 } else 72 h_dec(); 73 74 sp->_fifo[head] = ch; 75 T(("ungetch %s ok", _nc_tracechar(sp, ch))); 76 #ifdef TRACE 77 if (USE_TRACEF(TRACE_IEVENT)) { 78 _nc_fifo_dump(sp); 79 _nc_unlock_global(tracef); 80 } 81 #endif 82 rc = OK; 83 } 84 return rc; 85 } 86 87 NCURSES_EXPORT(int) 88 ungetch(int ch) 89 { 90 T((T_CALLED("ungetch(%s)"), _nc_tracechar(SP, ch))); 91 returnCode(_nc_ungetch(SP, ch)); 92 } 93