1/****************************************************************************
2 * Copyright (c) 1998-2009,2010 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                        2002                    *
33 *     and: Juergen Pfeifer                         2009                    *
34 ****************************************************************************/
35
36/*
37 *	lib_kernel.c
38 *
39 *	Misc. low-level routines:
40 *		erasechar()
41 *		killchar()
42 *		flushinp()
43 *
44 * The baudrate() and delay_output() functions could logically live here,
45 * but are in other modules to reduce the static-link size of programs
46 * that use only these facilities.
47 */
48
49#include <curses.priv.h>
50
51MODULE_ID("$Id: lib_kernel.c,v 1.31 2010/12/19 01:21:19 tom Exp $")
52
53static int
54_nc_vdisable(void)
55{
56    int value = -1;
57#if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H
58    value = _POSIX_VDISABLE;
59#endif
60#if defined(_PC_VDISABLE)
61    if (value == -1) {
62	value = (int) fpathconf(0, _PC_VDISABLE);
63	if (value == -1) {
64	    value = 0377;
65	}
66    }
67#elif defined(VDISABLE)
68    if (value == -1)
69	value = VDISABLE;
70#endif
71    return value;
72}
73
74/*
75 *	erasechar()
76 *
77 *	Return erase character as given in cur_term->Ottyb.
78 *
79 */
80
81NCURSES_EXPORT(char)
82NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0)
83{
84    int result = ERR;
85    TERMINAL *termp = TerminalOf(SP_PARM);
86
87    T((T_CALLED("erasechar(%p)"), (void *) SP_PARM));
88
89    if (termp != 0) {
90#ifdef TERMIOS
91	result = termp->Ottyb.c_cc[VERASE];
92	if (result == _nc_vdisable())
93	    result = ERR;
94#else
95	result = termp->Ottyb.sg_erase;
96#endif
97    }
98    returnChar((char) result);
99}
100
101#if NCURSES_SP_FUNCS
102NCURSES_EXPORT(char)
103erasechar(void)
104{
105    return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN);
106}
107#endif
108
109/*
110 *	killchar()
111 *
112 *	Return kill character as given in cur_term->Ottyb.
113 *
114 */
115
116NCURSES_EXPORT(char)
117NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0)
118{
119    int result = ERR;
120    TERMINAL *termp = TerminalOf(SP_PARM);
121
122    T((T_CALLED("killchar(%p)"), (void *) SP_PARM));
123
124    if (termp != 0) {
125#ifdef TERMIOS
126	result = termp->Ottyb.c_cc[VKILL];
127	if (result == _nc_vdisable())
128	    result = ERR;
129#else
130	result = termp->Ottyb.sg_kill;
131#endif
132    }
133    returnChar((char) result);
134}
135
136#if NCURSES_SP_FUNCS
137NCURSES_EXPORT(char)
138killchar(void)
139{
140    return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
141}
142#endif
143
144/*
145 *	flushinp()
146 *
147 *	Flush any input on cur_term->Filedes
148 *
149 */
150
151NCURSES_EXPORT(int)
152NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0)
153{
154    TERMINAL *termp = TerminalOf(SP_PARM);
155
156    T((T_CALLED("flushinp(%p)"), (void *) SP_PARM));
157
158    if (termp != 0) {
159#ifdef TERMIOS
160	tcflush(termp->Filedes, TCIFLUSH);
161#else
162	errno = 0;
163	do {
164	    ioctl(termp->Filedes, TIOCFLUSH, 0);
165	} while
166	    (errno == EINTR);
167#endif
168	if (SP_PARM) {
169	    SP_PARM->_fifohead = -1;
170	    SP_PARM->_fifotail = 0;
171	    SP_PARM->_fifopeek = 0;
172	}
173	returnCode(OK);
174    }
175    returnCode(ERR);
176}
177
178#if NCURSES_SP_FUNCS
179NCURSES_EXPORT(int)
180flushinp(void)
181{
182    return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
183}
184#endif
185