1 /****************************************************************************
2 * Copyright 2020-2022,2023 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 1.36 2023/06/10 13:29:06 tom Exp $")
53
54 #ifdef TERMIOS
55 static int
_nc_vdisable(void)56 _nc_vdisable(void)
57 {
58 int value = -1;
59 #if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H
60 value = _POSIX_VDISABLE;
61 #endif
62 #if defined(_PC_VDISABLE) && HAVE_FPATHCONF
63 if (value == -1) {
64 value = (int) fpathconf(0, _PC_VDISABLE);
65 if (value == -1) {
66 value = 0377;
67 }
68 }
69 #elif defined(VDISABLE)
70 if (value == -1)
71 value = VDISABLE;
72 #endif
73 return value;
74 }
75 #endif /* TERMIOS */
76
77 /*
78 * erasechar()
79 *
80 * Return erase character as given in cur_term->Ottyb.
81 *
82 */
83
84 NCURSES_EXPORT(char)
NCURSES_SP_NAME(erasechar)85 NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0)
86 {
87 int result = ERR;
88 TERMINAL *termp = TerminalOf(SP_PARM);
89
90 T((T_CALLED("erasechar(%p)"), (void *) SP_PARM));
91
92 if (termp != 0) {
93 #ifdef TERMIOS
94 result = termp->Ottyb.c_cc[VERASE];
95 if (result == _nc_vdisable())
96 result = ERR;
97 #elif defined(EXP_WIN32_DRIVER)
98 result = ERR;
99 #else
100 result = termp->Ottyb.sg_erase;
101 #endif
102 }
103 returnChar((char) result);
104 }
105
106 #if NCURSES_SP_FUNCS
107 NCURSES_EXPORT(char)
erasechar(void)108 erasechar(void)
109 {
110 return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN);
111 }
112 #endif
113
114 /*
115 * killchar()
116 *
117 * Return kill character as given in cur_term->Ottyb.
118 *
119 */
120
121 NCURSES_EXPORT(char)
NCURSES_SP_NAME(killchar)122 NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0)
123 {
124 int result = ERR;
125 TERMINAL *termp = TerminalOf(SP_PARM);
126
127 T((T_CALLED("killchar(%p)"), (void *) SP_PARM));
128
129 if (termp != 0) {
130 #ifdef TERMIOS
131 result = termp->Ottyb.c_cc[VKILL];
132 if (result == _nc_vdisable())
133 result = ERR;
134 #elif defined(EXP_WIN32_DRIVER)
135 result = ERR;
136 #else
137 result = termp->Ottyb.sg_kill;
138 #endif
139 }
140 returnChar((char) result);
141 }
142
143 #if NCURSES_SP_FUNCS
144 NCURSES_EXPORT(char)
killchar(void)145 killchar(void)
146 {
147 return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
148 }
149 #endif
150
151 static void
flush_input(int fd)152 flush_input(int fd)
153 {
154 #ifdef TERMIOS
155 tcflush(fd, TCIFLUSH);
156 #else /* !TERMIOS */
157 errno = 0;
158 do {
159 #if defined(EXP_WIN32_DRIVER)
160 _nc_console_flush(_nc_console_fd2handle(fd));
161 #else
162 ioctl(fd, TIOCFLUSH, 0);
163 #endif
164 } while
165 (errno == EINTR);
166 #endif
167 }
168
169 /*
170 * flushinp()
171 *
172 * Flush any input on tty
173 */
174
175 NCURSES_EXPORT(int)
NCURSES_SP_NAME(flushinp)176 NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0)
177 {
178 T((T_CALLED("flushinp(%p)"), (void *) SP_PARM));
179
180 if (SP_PARM != 0) {
181 if (NC_ISATTY(SP_PARM->_ifd))
182 flush_input(SP_PARM->_ifd);
183 else if (NC_ISATTY(SP_PARM->_ofd))
184 flush_input(SP_PARM->_ofd);
185 if (SP_PARM) {
186 SP_PARM->_fifohead = -1;
187 SP_PARM->_fifotail = 0;
188 SP_PARM->_fifopeek = 0;
189 }
190 returnCode(OK);
191 }
192 returnCode(ERR);
193 }
194
195 #if NCURSES_SP_FUNCS
196 NCURSES_EXPORT(int)
flushinp(void)197 flushinp(void)
198 {
199 return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
200 }
201 #endif
202