1 /**************************************************************************** 2 * Copyright (c) 1998-2007,2008 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 * and: Thomas E. Dickey 1996-on * 33 ****************************************************************************/ 34 35 /* 36 ** lib_ungetch.c 37 ** 38 ** The routine ungetch(). 39 ** 40 */ 41 42 #include <curses.priv.h> 43 44 MODULE_ID("$Id: lib_ungetch.c,v 1.11 2008/05/31 16:44:54 tom Exp $") 45 46 #include <fifo_defs.h> 47 48 #ifdef TRACE 49 NCURSES_EXPORT(void) 50 _nc_fifo_dump(SCREEN *sp) 51 { 52 int i; 53 T(("head = %d, tail = %d, peek = %d", head, tail, peek)); 54 for (i = 0; i < 10; i++) 55 T(("char %d = %s", i, _nc_tracechar(sp, sp->_fifo[i]))); 56 } 57 #endif /* TRACE */ 58 59 NCURSES_EXPORT(int) 60 _nc_ungetch(SCREEN *sp, int ch) 61 { 62 int rc = ERR; 63 64 if (tail != -1) { 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", _nc_tracechar(sp, ch))); 74 #ifdef TRACE 75 if (USE_TRACEF(TRACE_IEVENT)) { 76 _nc_fifo_dump(sp); 77 _nc_unlock_global(tracef); 78 } 79 #endif 80 rc = OK; 81 } 82 return rc; 83 } 84 85 NCURSES_EXPORT(int) 86 ungetch(int ch) 87 { 88 T((T_CALLED("ungetch(%s)"), _nc_tracechar(SP, ch))); 89 returnCode(_nc_ungetch(SP, ch)); 90 } 91