1 /*-
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)tty.c 8.6 (Berkeley) 01/10/95";
10 #endif /* not lint */
11
12 #include <stdlib.h>
13 #include <termios.h>
14 #include <unistd.h>
15
16 #include "curses.h"
17
18 /*
19 * In general, curses should leave tty hardware settings alone (speed, parity,
20 * word size). This is most easily done in BSD by using TCSASOFT on all
21 * tcsetattr calls. On other systems, it would be better to get and restore
22 * those attributes at each change, or at least when stopped and restarted.
23 * See also the comments in getterm().
24 */
25 #ifdef TCSASOFT
26 int __tcaction = 1; /* Ignore hardware settings. */
27 #else
28 int __tcaction = 0;
29 #endif
30
31 struct termios __orig_termios, __baset;
32 static struct termios cbreakt, rawt, *curt;
33 static int useraw;
34
35 #ifndef OXTABS
36 #ifdef XTABS /* SMI uses XTABS. */
37 #define OXTABS XTABS
38 #else
39 #define OXTABS 0
40 #endif
41 #endif
42
43 /*
44 * gettmode --
45 * Do terminal type initialization.
46 */
47 int
gettmode()48 gettmode()
49 {
50 useraw = 0;
51
52 if (tcgetattr(STDIN_FILENO, &__orig_termios))
53 return (ERR);
54
55 __baset = __orig_termios;
56 __baset.c_oflag &= ~OXTABS;
57
58 GT = 0; /* historical. was used before we wired OXTABS off */
59 NONL = (__baset.c_oflag & ONLCR) == 0;
60
61 /*
62 * XXX
63 * System V and SMI systems overload VMIN and VTIME, such that
64 * VMIN is the same as the VEOF element, and VTIME is the same
65 * as the VEOL element. This means that, if VEOF was ^D, the
66 * default VMIN is 4. Majorly stupid.
67 */
68 cbreakt = __baset;
69 cbreakt.c_lflag &= ~ICANON;
70 cbreakt.c_cc[VMIN] = 1;
71 cbreakt.c_cc[VTIME] = 0;
72
73 rawt = cbreakt;
74 rawt.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|INLCR|IGNCR|ICRNL|IXON);
75 rawt.c_oflag &= ~OPOST;
76 rawt.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
77
78 /*
79 * In general, curses should leave hardware-related settings alone.
80 * This includes parity and word size. Older versions set the tty
81 * to 8 bits, no parity in raw(), but this is considered to be an
82 * artifact of the old tty interface. If it's desired to change
83 * parity and word size, the TCSASOFT bit has to be removed from the
84 * calls that switch to/from "raw" mode.
85 */
86 if (!__tcaction) {
87 rawt.c_iflag &= ~ISTRIP;
88 rawt.c_cflag &= ~(CSIZE|PARENB);
89 rawt.c_cflag |= CS8;
90 }
91
92 curt = &__baset;
93 return (tcsetattr(STDIN_FILENO, __tcaction ?
94 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
95 }
96
97 int
raw()98 raw()
99 {
100 useraw = __pfast = __rawmode = 1;
101 curt = &rawt;
102 return (tcsetattr(STDIN_FILENO, __tcaction ?
103 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
104 }
105
106 int
noraw()107 noraw()
108 {
109 useraw = __pfast = __rawmode = 0;
110 curt = &__baset;
111 return (tcsetattr(STDIN_FILENO, __tcaction ?
112 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
113 }
114
115 int
cbreak()116 cbreak()
117 {
118
119 __rawmode = 1;
120 curt = useraw ? &rawt : &cbreakt;
121 return (tcsetattr(STDIN_FILENO, __tcaction ?
122 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
123 }
124
125 int
nocbreak()126 nocbreak()
127 {
128
129 __rawmode = 0;
130 curt = useraw ? &rawt : &__baset;
131 return (tcsetattr(STDIN_FILENO, __tcaction ?
132 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
133 }
134
135 int
echo()136 echo()
137 {
138 rawt.c_lflag |= ECHO;
139 cbreakt.c_lflag |= ECHO;
140 __baset.c_lflag |= ECHO;
141
142 __echoit = 1;
143 return (tcsetattr(STDIN_FILENO, __tcaction ?
144 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
145 }
146
147 int
noecho()148 noecho()
149 {
150 rawt.c_lflag &= ~ECHO;
151 cbreakt.c_lflag &= ~ECHO;
152 __baset.c_lflag &= ~ECHO;
153
154 __echoit = 0;
155 return (tcsetattr(STDIN_FILENO, __tcaction ?
156 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
157 }
158
159 int
nl()160 nl()
161 {
162 rawt.c_iflag |= ICRNL;
163 rawt.c_oflag |= ONLCR;
164 cbreakt.c_iflag |= ICRNL;
165 cbreakt.c_oflag |= ONLCR;
166 __baset.c_iflag |= ICRNL;
167 __baset.c_oflag |= ONLCR;
168
169 __pfast = __rawmode;
170 return (tcsetattr(STDIN_FILENO, __tcaction ?
171 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
172 }
173
174 int
nonl()175 nonl()
176 {
177 rawt.c_iflag &= ~ICRNL;
178 rawt.c_oflag &= ~ONLCR;
179 cbreakt.c_iflag &= ~ICRNL;
180 cbreakt.c_oflag &= ~ONLCR;
181 __baset.c_iflag &= ~ICRNL;
182 __baset.c_oflag &= ~ONLCR;
183
184 __pfast = 1;
185 return (tcsetattr(STDIN_FILENO, __tcaction ?
186 TCSASOFT | TCSADRAIN : TCSADRAIN, curt) ? ERR : OK);
187 }
188
189 void
__startwin()190 __startwin()
191 {
192 static char *stdbuf;
193 static size_t len;
194
195 (void)fflush(stdout);
196
197 /*
198 * Some C libraries default to a 1K buffer when talking to a tty.
199 * With a larger screen, especially across a network, we'd like
200 * to get it to all flush in a single write. Make it twice as big
201 * as just the characters (so that we have room for cursor motions
202 * and standout information) but no more than 8K.
203 */
204 if (stdbuf == NULL) {
205 if ((len = LINES * COLS * 2) > 8192)
206 len = 8192;
207 if ((stdbuf = malloc(len)) == NULL)
208 len = 0;
209 }
210 (void)setvbuf(stdout, stdbuf, _IOFBF, len);
211
212 tputs(TI, 0, __cputchar);
213 tputs(VS, 0, __cputchar);
214 }
215
216 int
endwin()217 endwin()
218 {
219 __restore_stophandler();
220
221 if (curscr != NULL) {
222 if (curscr->flags & __WSTANDOUT) {
223 tputs(SE, 0, __cputchar);
224 curscr->flags &= ~__WSTANDOUT;
225 }
226 __mvcur(curscr->cury, curscr->curx, curscr->maxy - 1, 0, 0);
227 }
228
229 (void)tputs(VE, 0, __cputchar);
230 (void)tputs(TE, 0, __cputchar);
231 (void)fflush(stdout);
232 (void)setvbuf(stdout, NULL, _IOLBF, 0);
233
234 return (tcsetattr(STDIN_FILENO, __tcaction ?
235 TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK);
236 }
237
238 /*
239 * The following routines, savetty and resetty are completely useless and
240 * are left in only as stubs. If people actually use them they will almost
241 * certainly screw up the state of the world.
242 */
243 static struct termios savedtty;
244 int
savetty()245 savetty()
246 {
247 return (tcgetattr(STDIN_FILENO, &savedtty) ? ERR : OK);
248 }
249
250 int
resetty()251 resetty()
252 {
253 return (tcsetattr(STDIN_FILENO, __tcaction ?
254 TCSASOFT | TCSADRAIN : TCSADRAIN, &savedtty) ? ERR : OK);
255 }
256