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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
54MODULE_ID("$Id: lib_kernel.c,v 1.4 2023/10/17 09:52:09 nicm Exp $")
55
56#ifdef TERMIOS
57static int
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
86NCURSES_EXPORT(char)
87NCURSES_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
109NCURSES_EXPORT(char)
110erasechar(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
123NCURSES_EXPORT(char)
124NCURSES_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
146NCURSES_EXPORT(char)
147killchar(void)
148{
149 return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
150}
151#endif
152
153static void
154flush_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
177NCURSES_EXPORT(int)
178NCURSES_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
198NCURSES_EXPORT(int)
199flushinp(void)
200{
201 return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
202}
203#endif