1 /****************************************************************************
2  * Copyright (c) 1998-2003,2004 Free Software Foundation, Inc.              *
3  *                                                                          *
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5  * copy of this software and associated documentation files (the            *
6  * "Software"), to deal in the Software without restriction, including      *
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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,   *
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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 
51 MODULE_ID("$Id: lib_kernel.c,v 1.24 2004/05/08 17:11:21 tom Exp $")
52 
53 static 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 
81 NCURSES_EXPORT(char)
82 erasechar(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 
106 NCURSES_EXPORT(char)
107 killchar(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 
131 NCURSES_EXPORT(int)
132 flushinp(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