| Amit Daniel Kachhap | e6a01f5 | 2011-07-20 11:45:59 +0530 | [diff] [blame] | 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 | } |