1 /****************************************************************************
2 * Copyright 2020 Thomas E. Dickey *
3 * Copyright 1998-2009,2010 Free Software Foundation, Inc. *
4 * *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
12 * *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
15 * *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * *
24 * Except as contained in this notice, the name(s) of the above copyright *
25 * holders shall not be used in advertising or otherwise to promote the *
26 * sale, use or other dealings in this Software without prior written *
27 * authorization. *
28 ****************************************************************************/
29
30 /****************************************************************************
31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
32 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
33 * and: Thomas E. Dickey 2002 *
34 * and: Juergen Pfeifer 2009 *
35 ****************************************************************************/
36
37 /*
38 * lib_kernel.c
39 *
40 * Misc. low-level routines:
41 * erasechar()
42 * killchar()
43 * flushinp()
44 *
45 * The baudrate() and delay_output() functions could logically live here,
46 * but are in other modules to reduce the static-link size of programs
47 * that use only these facilities.
48 */
49
50 #include <curses.priv.h>
51
52 MODULE_ID("$Id: lib_kernel.c,v 1.32 2020/02/02 23:34:34 tom Exp $")
53
54 static int
_nc_vdisable(void)55 _nc_vdisable(void)
56 {
57 int value = -1;
58 #if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H
59 value = _POSIX_VDISABLE;
60 #endif
61 #if defined(_PC_VDISABLE)
62 if (value == -1) {
63 value = (int) fpathconf(0, _PC_VDISABLE);
64 if (value == -1) {
65 value = 0377;
66 }
67 }
68 #elif defined(VDISABLE)
69 if (value == -1)
70 value = VDISABLE;
71 #endif
72 return value;
73 }
74
75 /*
76 * erasechar()
77 *
78 * Return erase character as given in cur_term->Ottyb.
79 *
80 */
81
82 NCURSES_EXPORT(char)
NCURSES_SP_NAME(erasechar)83 NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0)
84 {
85 int result = ERR;
86 TERMINAL *termp = TerminalOf(SP_PARM);
87
88 T((T_CALLED("erasechar(%p)"), (void *) SP_PARM));
89
90 if (termp != 0) {
91 #ifdef TERMIOS
92 result = termp->Ottyb.c_cc[VERASE];
93 if (result == _nc_vdisable())
94 result = ERR;
95 #else
96 result = termp->Ottyb.sg_erase;
97 #endif
98 }
99 returnChar((char) result);
100 }
101
102 #if NCURSES_SP_FUNCS
103 NCURSES_EXPORT(char)
erasechar(void)104 erasechar(void)
105 {
106 return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN);
107 }
108 #endif
109
110 /*
111 * killchar()
112 *
113 * Return kill character as given in cur_term->Ottyb.
114 *
115 */
116
117 NCURSES_EXPORT(char)
NCURSES_SP_NAME(killchar)118 NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0)
119 {
120 int result = ERR;
121 TERMINAL *termp = TerminalOf(SP_PARM);
122
123 T((T_CALLED("killchar(%p)"), (void *) SP_PARM));
124
125 if (termp != 0) {
126 #ifdef TERMIOS
127 result = termp->Ottyb.c_cc[VKILL];
128 if (result == _nc_vdisable())
129 result = ERR;
130 #else
131 result = termp->Ottyb.sg_kill;
132 #endif
133 }
134 returnChar((char) result);
135 }
136
137 #if NCURSES_SP_FUNCS
138 NCURSES_EXPORT(char)
killchar(void)139 killchar(void)
140 {
141 return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
142 }
143 #endif
144
145 /*
146 * flushinp()
147 *
148 * Flush any input on cur_term->Filedes
149 *
150 */
151
152 NCURSES_EXPORT(int)
NCURSES_SP_NAME(flushinp)153 NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0)
154 {
155 TERMINAL *termp = TerminalOf(SP_PARM);
156
157 T((T_CALLED("flushinp(%p)"), (void *) SP_PARM));
158
159 if (termp != 0) {
160 #ifdef TERMIOS
161 tcflush(termp->Filedes, TCIFLUSH);
162 #else
163 errno = 0;
164 do {
165 ioctl(termp->Filedes, TIOCFLUSH, 0);
166 } while
167 (errno == EINTR);
168 #endif
169 if (SP_PARM) {
170 SP_PARM->_fifohead = -1;
171 SP_PARM->_fifotail = 0;
172 SP_PARM->_fifopeek = 0;
173 }
174 returnCode(OK);
175 }
176 returnCode(ERR);
177 }
178
179 #if NCURSES_SP_FUNCS
180 NCURSES_EXPORT(int)
flushinp(void)181 flushinp(void)
182 {
183 return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
184 }
185 #endif
186