1 /* $OpenBSD: lib_kernel.c,v 1.4 2023/10/17 09:52:09 nicm Exp $ */
2
3 /****************************************************************************
4 * Copyright 2020-2022,2023 Thomas E. Dickey *
5 * Copyright 1998-2009,2010 Free Software Foundation, Inc. *
6 * *
7 * Permission is hereby granted, free of charge, to any person obtaining a *
8 * copy of this software and associated documentation files (the *
9 * "Software"), to deal in the Software without restriction, including *
10 * without limitation the rights to use, copy, modify, merge, publish, *
11 * distribute, distribute with modifications, sublicense, and/or sell *
12 * copies of the Software, and to permit persons to whom the Software is *
13 * furnished to do so, subject to the following conditions: *
14 * *
15 * The above copyright notice and this permission notice shall be included *
16 * in all copies or substantial portions of the Software. *
17 * *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
25 * *
26 * Except as contained in this notice, the name(s) of the above copyright *
27 * holders shall not be used in advertising or otherwise to promote the *
28 * sale, use or other dealings in this Software without prior written *
29 * authorization. *
30 ****************************************************************************/
31
32 /****************************************************************************
33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
34 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
35 * and: Thomas E. Dickey 2002 *
36 * and: Juergen Pfeifer 2009 *
37 ****************************************************************************/
38
39 /*
40 * lib_kernel.c
41 *
42 * Misc. low-level routines:
43 * erasechar()
44 * killchar()
45 * flushinp()
46 *
47 * The baudrate() and delay_output() functions could logically live here,
48 * but are in other modules to reduce the static-link size of programs
49 * that use only these facilities.
50 */
51
52 #include <curses.priv.h>
53
54 MODULE_ID("$Id: lib_kernel.c,v 1.4 2023/10/17 09:52:09 nicm Exp $")
55
56 #ifdef TERMIOS
57 static int
_nc_vdisable(void)58 _nc_vdisable(void)
59 {
60 int value = -1;
61 #if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H
62 value = _POSIX_VDISABLE;
63 #endif
64 #if defined(_PC_VDISABLE) && HAVE_FPATHCONF
65 if (value == -1) {
66 value = (int) fpathconf(0, _PC_VDISABLE);
67 if (value == -1) {
68 value = 0377;
69 }
70 }
71 #elif defined(VDISABLE)
72 if (value == -1)
73 value = VDISABLE;
74 #endif
75 return value;
76 }
77 #endif /* TERMIOS */
78
79 /*
80 * erasechar()
81 *
82 * Return erase character as given in cur_term->Ottyb.
83 *
84 */
85
86 NCURSES_EXPORT(char)
NCURSES_SP_NAME(erasechar)87 NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0)
88 {
89 int result = ERR;
90 TERMINAL *termp = TerminalOf(SP_PARM);
91
92 T((T_CALLED("erasechar(%p)"), (void *) SP_PARM));
93
94 if (termp != 0) {
95 #ifdef TERMIOS
96 result = termp->Ottyb.c_cc[VERASE];
97 if (result == _nc_vdisable())
98 result = ERR;
99 #elif defined(EXP_WIN32_DRIVER)
100 result = ERR;
101 #else
102 result = termp->Ottyb.sg_erase;
103 #endif
104 }
105 returnChar((char) result);
106 }
107
108 #if NCURSES_SP_FUNCS
109 NCURSES_EXPORT(char)
erasechar(void)110 erasechar(void)
111 {
112 return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN);
113 }
114 #endif
115
116 /*
117 * killchar()
118 *
119 * Return kill character as given in cur_term->Ottyb.
120 *
121 */
122
123 NCURSES_EXPORT(char)
NCURSES_SP_NAME(killchar)124 NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0)
125 {
126 int result = ERR;
127 TERMINAL *termp = TerminalOf(SP_PARM);
128
129 T((T_CALLED("killchar(%p)"), (void *) SP_PARM));
130
131 if (termp != 0) {
132 #ifdef TERMIOS
133 result = termp->Ottyb.c_cc[VKILL];
134 if (result == _nc_vdisable())
135 result = ERR;
136 #elif defined(EXP_WIN32_DRIVER)
137 result = ERR;
138 #else
139 result = termp->Ottyb.sg_kill;
140 #endif
141 }
142 returnChar((char) result);
143 }
144
145 #if NCURSES_SP_FUNCS
146 NCURSES_EXPORT(char)
killchar(void)147 killchar(void)
148 {
149 return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
150 }
151 #endif
152
153 static void
flush_input(int fd)154 flush_input(int fd)
155 {
156 #ifdef TERMIOS
157 tcflush(fd, TCIFLUSH);
158 #else /* !TERMIOS */
159 errno = 0;
160 do {
161 #if defined(EXP_WIN32_DRIVER)
162 _nc_console_flush(_nc_console_fd2handle(fd));
163 #else
164 ioctl(fd, TIOCFLUSH, 0);
165 #endif
166 } while
167 (errno == EINTR);
168 #endif
169 }
170
171 /*
172 * flushinp()
173 *
174 * Flush any input on tty
175 */
176
177 NCURSES_EXPORT(int)
NCURSES_SP_NAME(flushinp)178 NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0)
179 {
180 T((T_CALLED("flushinp(%p)"), (void *) SP_PARM));
181
182 if (SP_PARM != 0) {
183 if (NC_ISATTY(SP_PARM->_ifd))
184 flush_input(SP_PARM->_ifd);
185 else if (NC_ISATTY(SP_PARM->_ofd))
186 flush_input(SP_PARM->_ofd);
187 if (SP_PARM) {
188 SP_PARM->_fifohead = -1;
189 SP_PARM->_fifotail = 0;
190 SP_PARM->_fifopeek = 0;
191 }
192 returnCode(OK);
193 }
194 returnCode(ERR);
195 }
196
197 #if NCURSES_SP_FUNCS
198 NCURSES_EXPORT(int)
flushinp(void)199 flushinp(void)
200 {
201 return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
202 }
203 #endif
204