1 /*-
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static char sccsid[] = "@(#)tty.c 8.5 (Berkeley) 8/13/94";
32 #endif /* not lint */
33
34 #include <stdlib.h>
35 #include <termios.h>
36 #include <unistd.h>
37
38 #include "curses.h"
39
40 /*
41 * In general, curses should leave tty hardware settings alone (speed, parity,
42 * word size). This is most easily done in BSD by using TCSASOFT on all
43 * tcsetattr calls. On other systems, it would be better to get and restore
44 * those attributes at each change, or at least when stopped and restarted.
45 * See also the comments in getterm().
46 */
47 #ifdef TCSASOFT
48 int __tcaction = 1; /* Ignore hardware settings. */
49 #else
50 int __tcaction = 0;
51 #endif
52
53 struct termios __orig_termios, __baset;
54 static struct termios cbreakt, rawt, *curt;
55 static int useraw;
56
57 #ifndef OXTABS
58 #ifdef XTABS /* SMI uses XTABS. */
59 #define OXTABS XTABS
60 #else
61 #define OXTABS 0
62 #endif
63 #endif
64
65 /*
66 * gettmode --
67 * Do terminal type initialization.
68 */
69 int
gettmode()70 gettmode()
71 {
72 useraw = 0;
73
74 if (tcgetattr(STDIN_FILENO, &__orig_termios))
75 return (ERR);
76
77 __baset = __orig_termios;
78 __baset.c_oflag &= ~OXTABS;
79
80 GT = 0; /* historical. was used before we wired OXTABS off */
81 NONL = (__baset.c_oflag & ONLCR) == 0;
82
83 /*
84 * XXX
85 * System V and SMI systems overload VMIN and VTIME, such that
86 * VMIN is the same as the VEOF element, and VTIME is the same
87 * as the VEOL element. This means that, if VEOF was ^D, the
88 * default VMIN is 4. Majorly stupid.
89 */
90 cbreakt = __baset;
91 cbreakt.c_lflag &= ~ICANON;
92 cbreakt.c_cc[VMIN] = 1;
93 cbreakt.c_cc[VTIME] = 0;
94
95 rawt = cbreakt;
96 rawt.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
97 rawt.c_oflag &= ~OPOST;
98 rawt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
99
100 /*
101 * In general, curses should leave hardware-related settings alone.
102 * This includes parity and word size. Older versions set the tty
103 * to 8 bits, no parity in raw(), but this is considered to be an
104 * artifact of the old tty interface. If it's desired to change
105 * parity and word size, the TCSASOFT bit has to be removed from the
106 * calls that switch to/from "raw" mode.
107 */
108 if (!__tcaction) {
109 rawt.c_iflag &= ~ISTRIP;
110 rawt.c_cflag &= ~(CSIZE|PARENB);
111 rawt.c_cflag |= CS8;
112 }
113
114 curt = &__baset;
115 return (tcsetattr(STDIN_FILENO, __tcaction ?
116 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
117 }
118
119 int
raw()120 raw()
121 {
122 useraw = __pfast = __rawmode = 1;
123 curt = &rawt;
124 return (tcsetattr(STDIN_FILENO, __tcaction ?
125 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
126 }
127
128 int
noraw()129 noraw()
130 {
131 useraw = __pfast = __rawmode = 0;
132 curt = &__baset;
133 return (tcsetattr(STDIN_FILENO, __tcaction ?
134 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
135 }
136
137 int
cbreak()138 cbreak()
139 {
140
141 __rawmode = 1;
142 curt = useraw ? &rawt : &cbreakt;
143 return (tcsetattr(STDIN_FILENO, __tcaction ?
144 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
145 }
146
147 int
nocbreak()148 nocbreak()
149 {
150
151 __rawmode = 0;
152 curt = useraw ? &rawt : &__baset;
153 return (tcsetattr(STDIN_FILENO, __tcaction ?
154 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
155 }
156
157 int
echo()158 echo()
159 {
160 rawt.c_lflag |= ECHO;
161 cbreakt.c_lflag |= ECHO;
162 __baset.c_lflag |= ECHO;
163
164 __echoit = 1;
165 return (tcsetattr(STDIN_FILENO, __tcaction ?
166 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
167 }
168
169 int
noecho()170 noecho()
171 {
172 rawt.c_lflag &= ~ECHO;
173 cbreakt.c_lflag &= ~ECHO;
174 __baset.c_lflag &= ~ECHO;
175
176 __echoit = 0;
177 return (tcsetattr(STDIN_FILENO, __tcaction ?
178 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
179 }
180
181 int
nl()182 nl()
183 {
184 rawt.c_iflag |= ICRNL;
185 rawt.c_oflag |= ONLCR;
186 cbreakt.c_iflag |= ICRNL;
187 cbreakt.c_oflag |= ONLCR;
188 __baset.c_iflag |= ICRNL;
189 __baset.c_oflag |= ONLCR;
190
191 __pfast = __rawmode;
192 return (tcsetattr(STDIN_FILENO, __tcaction ?
193 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
194 }
195
196 int
nonl()197 nonl()
198 {
199 rawt.c_iflag &= ~ICRNL;
200 rawt.c_oflag &= ~ONLCR;
201 cbreakt.c_iflag &= ~ICRNL;
202 cbreakt.c_oflag &= ~ONLCR;
203 __baset.c_iflag &= ~ICRNL;
204 __baset.c_oflag &= ~ONLCR;
205
206 __pfast = 1;
207 return (tcsetattr(STDIN_FILENO, __tcaction ?
208 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
209 }
210
211 void
__startwin()212 __startwin()
213 {
214 static char *stdbuf;
215 static size_t len;
216
217 (void)fflush(stdout);
218
219 /*
220 * Some C libraries default to a 1K buffer when talking to a tty.
221 * With a larger screen, especially across a network, we'd like
222 * to get it to all flush in a single write. Make it twice as big
223 * as just the characters (so that we have room for cursor motions
224 * and standout information) but no more than 8K.
225 */
226 if (stdbuf == NULL) {
227 if ((len = LINES * COLS * 2) > 8192)
228 len = 8192;
229 if ((stdbuf = malloc(len)) == NULL)
230 len = 0;
231 }
232 (void)setvbuf(stdout, stdbuf, _IOFBF, len);
233
234 tputs(TI, 0, __cputchar);
235 tputs(VS, 0, __cputchar);
236 }
237
238 int
endwin()239 endwin()
240 {
241 __restore_stophandler();
242
243 if (curscr != NULL) {
244 if (curscr->flags & __WSTANDOUT) {
245 tputs(SE, 0, __cputchar);
246 curscr->flags &= ~__WSTANDOUT;
247 }
248 __mvcur(curscr->cury, curscr->cury, curscr->maxy - 1, 0, 0);
249 }
250
251 (void)tputs(VE, 0, __cputchar);
252 (void)tputs(TE, 0, __cputchar);
253 (void)fflush(stdout);
254 (void)setvbuf(stdout, NULL, _IOLBF, 0);
255
256 return (tcsetattr(STDIN_FILENO, __tcaction ?
257 TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK);
258 }
259
260 /*
261 * The following routines, savetty and resetty are completely useless and
262 * are left in only as stubs. If people actually use them they will almost
263 * certainly screw up the state of the world.
264 */
265 static struct termios savedtty;
266 int
savetty()267 savetty()
268 {
269 return (tcgetattr(STDIN_FILENO, &savedtty) ? ERR : OK);
270 }
271
272 int
resetty()273 resetty()
274 {
275 return (tcsetattr(STDIN_FILENO, __tcaction ?
276 TCSASOFT | TCSADRAIN : TCSADRAIN, &savedtty) ? ERR : OK);
277 }
278