1/****************************************************************************
2 * Copyright (c) 1998-2003,2004 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 ****************************************************************************/
34
35/*
36 *	lib_kernel.c
37 *
38 *	Misc. low-level routines:
39 *		erasechar()
40 *		killchar()
41 *		flushinp()
42 *
43 * The baudrate() and delay_output() functions could logically live here,
44 * but are in other modules to reduce the static-link size of programs
45 * that use only these facilities.
46 */
47
48#include <curses.priv.h>
49#include <term.h>		/* cur_term */
50
51MODULE_ID("$Id: lib_kernel.c,v 1.24 2004/05/08 17:11:21 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 = 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)
82erasechar(void)
83{
84    int result = ERR;
85    T((T_CALLED("erasechar()")));
86
87    if (cur_term != 0) {
88#ifdef TERMIOS
89	result = cur_term->Ottyb.c_cc[VERASE];
90	if (result == _nc_vdisable())
91	    result = ERR;
92#else
93	result = cur_term->Ottyb.sg_erase;
94#endif
95    }
96    returnCode(result);
97}
98
99/*
100 *	killchar()
101 *
102 *	Return kill character as given in cur_term->Ottyb.
103 *
104 */
105
106NCURSES_EXPORT(char)
107killchar(void)
108{
109    int result = ERR;
110    T((T_CALLED("killchar()")));
111
112    if (cur_term != 0) {
113#ifdef TERMIOS
114	result = cur_term->Ottyb.c_cc[VKILL];
115	if (result == _nc_vdisable())
116	    result = ERR;
117#else
118	result = cur_term->Ottyb.sg_kill;
119#endif
120    }
121    returnCode(result);
122}
123
124/*
125 *	flushinp()
126 *
127 *	Flush any input on cur_term->Filedes
128 *
129 */
130
131NCURSES_EXPORT(int)
132flushinp(void)
133{
134    T((T_CALLED("flushinp()")));
135
136    if (cur_term != 0) {
137#ifdef TERMIOS
138	tcflush(cur_term->Filedes, TCIFLUSH);
139#else
140	errno = 0;
141	do {
142	    ioctl(cur_term->Filedes, TIOCFLUSH, 0);
143	} while
144	    (errno == EINTR);
145#endif
146	if (SP) {
147	    SP->_fifohead = -1;
148	    SP->_fifotail = 0;
149	    SP->_fifopeek = 0;
150	}
151	returnCode(OK);
152    }
153    returnCode(ERR);
154}
155