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1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
3 | * Copyright (c) 1988 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * Mark Nudleman. | |
8 | * | |
9 | * Redistribution and use in source and binary forms are permitted | |
10 | * provided that the above copyright notice and this paragraph are | |
11 | * duplicated in all such forms and that any documentation, | |
12 | * advertising materials, and other materials related to such | |
13 | * distribution and use acknowledge that the software was developed | |
14 | * by the University of California, Berkeley. The name of the | |
15 | * University may not be used to endorse or promote products derived | |
16 | * from this software without specific prior written permission. | |
17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
18 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
19 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
20 | */ | |
21 | ||
22 | #ifndef lint | |
23 | static char sccsid[] = "@(#)screen.c 5.1 (Berkeley) %G%"; | |
24 | #endif /* not lint */ | |
25 | ||
26 | /* | |
27 | * Routines which deal with the characteristics of the terminal. | |
28 | * Uses termcap to be as terminal-independent as possible. | |
29 | * | |
30 | * {{ Someday this should be rewritten to use curses. }} | |
31 | */ | |
32 | ||
33 | #include "less.h" | |
34 | #if XENIX | |
35 | #include <sys/types.h> | |
36 | #include <sys/ioctl.h> | |
37 | #endif | |
38 | ||
39 | #if TERMIO | |
40 | #include <termio.h> | |
41 | #else | |
42 | #include <sgtty.h> | |
43 | #endif | |
44 | ||
45 | #ifdef TIOCGWINSZ | |
46 | #include <sys/ioctl.h> | |
47 | #else | |
48 | /* | |
49 | * For the Unix PC (ATT 7300 & 3B1): | |
50 | * Since WIOCGETD is defined in sys/window.h, we can't use that to decide | |
51 | * whether to include sys/window.h. Use SIGPHONE from sys/signal.h instead. | |
52 | */ | |
53 | #include <sys/signal.h> | |
54 | #ifdef SIGPHONE | |
55 | #include <sys/window.h> | |
56 | #endif | |
57 | #endif | |
58 | ||
59 | /* | |
60 | * Strings passed to tputs() to do various terminal functions. | |
61 | */ | |
62 | static char | |
63 | *sc_pad, /* Pad string */ | |
64 | *sc_home, /* Cursor home */ | |
65 | *sc_addline, /* Add line, scroll down following lines */ | |
66 | *sc_lower_left, /* Cursor to last line, first column */ | |
67 | *sc_move, /* General cursor positioning */ | |
68 | *sc_clear, /* Clear screen */ | |
69 | *sc_eol_clear, /* Clear to end of line */ | |
70 | *sc_s_in, /* Enter standout (highlighted) mode */ | |
71 | *sc_s_out, /* Exit standout mode */ | |
72 | *sc_u_in, /* Enter underline mode */ | |
73 | *sc_u_out, /* Exit underline mode */ | |
74 | *sc_b_in, /* Enter bold mode */ | |
75 | *sc_b_out, /* Exit bold mode */ | |
76 | *sc_visual_bell, /* Visual bell (flash screen) sequence */ | |
77 | *sc_backspace, /* Backspace cursor */ | |
78 | *sc_init, /* Startup terminal initialization */ | |
79 | *sc_deinit; /* Exit terminal de-intialization */ | |
80 | ||
81 | public int auto_wrap; /* Terminal does \r\n when write past margin */ | |
82 | public int ignaw; /* Terminal ignores \n immediately after wrap */ | |
83 | public int erase_char, kill_char; /* The user's erase and line-kill chars */ | |
84 | public int sc_width, sc_height; /* Height & width of screen */ | |
85 | public int sc_window = -1; /* window size for forward and backward */ | |
86 | public int bo_width, be_width; /* Printing width of boldface sequences */ | |
87 | public int ul_width, ue_width; /* Printing width of underline sequences */ | |
88 | public int so_width, se_width; /* Printing width of standout sequences */ | |
89 | ||
90 | /* | |
91 | * These two variables are sometimes defined in, | |
92 | * and needed by, the termcap library. | |
93 | * It may be necessary on some systems to declare them extern here. | |
94 | */ | |
95 | /*extern*/ short ospeed; /* Terminal output baud rate */ | |
96 | /*extern*/ char PC; /* Pad character */ | |
97 | ||
98 | extern int quiet; /* If VERY_QUIET, use visual bell for bell */ | |
99 | extern int know_dumb; /* Don't complain about a dumb terminal */ | |
100 | extern int back_scroll; | |
101 | char *tgetstr(); | |
102 | char *tgoto(); | |
103 | ||
104 | /* | |
105 | * Change terminal to "raw mode", or restore to "normal" mode. | |
106 | * "Raw mode" means | |
107 | * 1. An outstanding read will complete on receipt of a single keystroke. | |
108 | * 2. Input is not echoed. | |
109 | * 3. On output, \n is mapped to \r\n. | |
110 | * 4. \t is NOT expanded into spaces. | |
111 | * 5. Signal-causing characters such as ctrl-C (interrupt), | |
112 | * etc. are NOT disabled. | |
113 | * It doesn't matter whether an input \n is mapped to \r, or vice versa. | |
114 | */ | |
115 | public void | |
116 | raw_mode(on) | |
117 | int on; | |
118 | { | |
119 | #if TERMIO | |
120 | struct termio s; | |
121 | static struct termio save_term; | |
122 | ||
123 | if (on) | |
124 | { | |
125 | /* | |
126 | * Get terminal modes. | |
127 | */ | |
128 | ioctl(2, TCGETA, &s); | |
129 | ||
130 | /* | |
131 | * Save modes and set certain variables dependent on modes. | |
132 | */ | |
133 | save_term = s; | |
134 | ospeed = s.c_cflag & CBAUD; | |
135 | erase_char = s.c_cc[VERASE]; | |
136 | kill_char = s.c_cc[VKILL]; | |
137 | ||
138 | /* | |
139 | * Set the modes to the way we want them. | |
140 | */ | |
141 | s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL); | |
142 | s.c_oflag |= (OPOST|ONLCR|TAB3); | |
143 | s.c_oflag &= ~(OCRNL|ONOCR|ONLRET); | |
144 | s.c_cc[VMIN] = 1; | |
145 | s.c_cc[VTIME] = 0; | |
146 | } else | |
147 | { | |
148 | /* | |
149 | * Restore saved modes. | |
150 | */ | |
151 | s = save_term; | |
152 | } | |
153 | ioctl(2, TCSETAW, &s); | |
154 | #else | |
155 | struct sgttyb s; | |
156 | static struct sgttyb save_term; | |
157 | ||
158 | if (on) | |
159 | { | |
160 | /* | |
161 | * Get terminal modes. | |
162 | */ | |
163 | ioctl(2, TIOCGETP, &s); | |
164 | ||
165 | /* | |
166 | * Save modes and set certain variables dependent on modes. | |
167 | */ | |
168 | save_term = s; | |
169 | ospeed = s.sg_ospeed; | |
170 | erase_char = s.sg_erase; | |
171 | kill_char = s.sg_kill; | |
172 | ||
173 | /* | |
174 | * Set the modes to the way we want them. | |
175 | */ | |
176 | s.sg_flags |= CBREAK; | |
177 | s.sg_flags &= ~(ECHO|XTABS); | |
178 | } else | |
179 | { | |
180 | /* | |
181 | * Restore saved modes. | |
182 | */ | |
183 | s = save_term; | |
184 | } | |
185 | ioctl(2, TIOCSETN, &s); | |
186 | #endif | |
187 | } | |
188 | ||
189 | static void | |
190 | cannot(s) | |
191 | char *s; | |
192 | { | |
193 | char message[100]; | |
194 | ||
195 | if (know_dumb) | |
196 | /* | |
197 | * He knows he has a dumb terminal, so don't tell him. | |
198 | */ | |
199 | return; | |
200 | ||
201 | sprintf(message, "WARNING: terminal cannot \"%s\"", s); | |
202 | error(message); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Get terminal capabilities via termcap. | |
207 | */ | |
208 | public void | |
209 | get_term() | |
210 | { | |
211 | char termbuf[2048]; | |
212 | char *sp; | |
213 | char *term; | |
214 | int hard; | |
215 | #ifdef TIOCGWINSZ | |
216 | struct winsize w; | |
217 | #else | |
218 | #ifdef WIOCGETD | |
219 | struct uwdata w; | |
220 | #endif | |
221 | #endif | |
222 | static char sbuf[1024]; | |
223 | ||
224 | char *getenv(); | |
225 | ||
226 | /* | |
227 | * Find out what kind of terminal this is. | |
228 | */ | |
229 | if ((term = getenv("TERM")) == NULL) | |
230 | term = "unknown"; | |
231 | if (tgetent(termbuf, term) <= 0) | |
232 | strcpy(termbuf, "dumb:co#80:hc:"); | |
233 | ||
234 | /* | |
235 | * Get size of the screen. | |
236 | */ | |
237 | #ifdef TIOCGWINSZ | |
238 | if (ioctl(2, TIOCGWINSZ, &w) == 0 && w.ws_row > 0) | |
239 | sc_height = w.ws_row; | |
240 | else | |
241 | #else | |
242 | #ifdef WIOCGETD | |
243 | if (ioctl(2, WIOCGETD, &w) == 0 && w.uw_height > 0) | |
244 | sc_height = w.uw_height/w.uw_vs; | |
245 | else | |
246 | #endif | |
247 | #endif | |
248 | sc_height = tgetnum("li"); | |
249 | hard = (sc_height < 0 || tgetflag("hc")); | |
250 | if (hard) | |
251 | { | |
252 | /* Oh no, this is a hardcopy terminal. */ | |
253 | sc_height = 24; | |
254 | } | |
255 | ||
256 | #ifdef TIOCGWINSZ | |
257 | if (ioctl(2, TIOCGWINSZ, &w) == 0 && w.ws_col > 0) | |
258 | sc_width = w.ws_col; | |
259 | else | |
260 | #ifdef WIOCGETD | |
261 | if (ioctl(2, WIOCGETD, &w) == 0 && w.uw_width > 0) | |
262 | sc_width = w.uw_width/w.uw_hs; | |
263 | else | |
264 | #endif | |
265 | #endif | |
266 | sc_width = tgetnum("co"); | |
267 | if (sc_width < 0) | |
268 | sc_width = 80; | |
269 | ||
270 | auto_wrap = tgetflag("am"); | |
271 | ignaw = tgetflag("xn"); | |
272 | ||
273 | /* | |
274 | * Assumes termcap variable "sg" is the printing width of | |
275 | * the standout sequence, the end standout sequence, | |
276 | * the underline sequence, the end underline sequence, | |
277 | * the boldface sequence, and the end boldface sequence. | |
278 | */ | |
279 | if ((so_width = tgetnum("sg")) < 0) | |
280 | so_width = 0; | |
281 | be_width = bo_width = ue_width = ul_width = se_width = so_width; | |
282 | ||
283 | /* | |
284 | * Get various string-valued capabilities. | |
285 | */ | |
286 | sp = sbuf; | |
287 | ||
288 | sc_pad = tgetstr("pc", &sp); | |
289 | if (sc_pad != NULL) | |
290 | PC = *sc_pad; | |
291 | ||
292 | sc_init = tgetstr("ti", &sp); | |
293 | if (sc_init == NULL) | |
294 | sc_init = ""; | |
295 | ||
296 | sc_deinit= tgetstr("te", &sp); | |
297 | if (sc_deinit == NULL) | |
298 | sc_deinit = ""; | |
299 | ||
300 | sc_eol_clear = tgetstr("ce", &sp); | |
301 | if (hard || sc_eol_clear == NULL || *sc_eol_clear == '\0') | |
302 | { | |
303 | cannot("clear to end of line"); | |
304 | sc_eol_clear = ""; | |
305 | } | |
306 | ||
307 | sc_clear = tgetstr("cl", &sp); | |
308 | if (hard || sc_clear == NULL || *sc_clear == '\0') | |
309 | { | |
310 | cannot("clear screen"); | |
311 | sc_clear = "\n\n"; | |
312 | } | |
313 | ||
314 | sc_move = tgetstr("cm", &sp); | |
315 | if (hard || sc_move == NULL || *sc_move == '\0') | |
316 | { | |
317 | /* | |
318 | * This is not an error here, because we don't | |
319 | * always need sc_move. | |
320 | * We need it only if we don't have home or lower-left. | |
321 | */ | |
322 | sc_move = ""; | |
323 | } | |
324 | ||
325 | sc_s_in = tgetstr("so", &sp); | |
326 | if (hard || sc_s_in == NULL) | |
327 | sc_s_in = ""; | |
328 | ||
329 | sc_s_out = tgetstr("se", &sp); | |
330 | if (hard || sc_s_out == NULL) | |
331 | sc_s_out = ""; | |
332 | ||
333 | sc_u_in = tgetstr("us", &sp); | |
334 | if (hard || sc_u_in == NULL) | |
335 | sc_u_in = sc_s_in; | |
336 | ||
337 | sc_u_out = tgetstr("ue", &sp); | |
338 | if (hard || sc_u_out == NULL) | |
339 | sc_u_out = sc_s_out; | |
340 | ||
341 | sc_b_in = tgetstr("md", &sp); | |
342 | if (hard || sc_b_in == NULL) | |
343 | { | |
344 | sc_b_in = sc_s_in; | |
345 | sc_b_out = sc_s_out; | |
346 | } else | |
347 | { | |
348 | sc_b_out = tgetstr("me", &sp); | |
349 | if (hard || sc_b_out == NULL) | |
350 | sc_b_out = ""; | |
351 | } | |
352 | ||
353 | sc_visual_bell = tgetstr("vb", &sp); | |
354 | if (hard || sc_visual_bell == NULL) | |
355 | sc_visual_bell = ""; | |
356 | ||
357 | sc_home = tgetstr("ho", &sp); | |
358 | if (hard || sc_home == NULL || *sc_home == '\0') | |
359 | { | |
360 | if (*sc_move == '\0') | |
361 | { | |
362 | cannot("home cursor"); | |
363 | /* | |
364 | * This last resort for sc_home is supposed to | |
365 | * be an up-arrow suggesting moving to the | |
366 | * top of the "virtual screen". (The one in | |
367 | * your imagination as you try to use this on | |
368 | * a hard copy terminal.) | |
369 | */ | |
370 | sc_home = "|\b^"; | |
371 | } else | |
372 | { | |
373 | /* | |
374 | * No "home" string, | |
375 | * but we can use "move(0,0)". | |
376 | */ | |
377 | strcpy(sp, tgoto(sc_move, 0, 0)); | |
378 | sc_home = sp; | |
379 | sp += strlen(sp) + 1; | |
380 | } | |
381 | } | |
382 | ||
383 | sc_lower_left = tgetstr("ll", &sp); | |
384 | if (hard || sc_lower_left == NULL || *sc_lower_left == '\0') | |
385 | { | |
386 | if (*sc_move == '\0') | |
387 | { | |
388 | cannot("move cursor to lower left of screen"); | |
389 | sc_lower_left = "\r"; | |
390 | } else | |
391 | { | |
392 | /* | |
393 | * No "lower-left" string, | |
394 | * but we can use "move(0,last-line)". | |
395 | */ | |
396 | strcpy(sp, tgoto(sc_move, 0, sc_height-1)); | |
397 | sc_lower_left = sp; | |
398 | sp += strlen(sp) + 1; | |
399 | } | |
400 | } | |
401 | ||
402 | /* | |
403 | * To add a line at top of screen and scroll the display down, | |
404 | * we use "al" (add line) or "sr" (scroll reverse). | |
405 | */ | |
406 | if ((sc_addline = tgetstr("al", &sp)) == NULL || | |
407 | *sc_addline == '\0') | |
408 | sc_addline = tgetstr("sr", &sp); | |
409 | ||
410 | if (hard || sc_addline == NULL || *sc_addline == '\0') | |
411 | { | |
412 | cannot("scroll backwards"); | |
413 | sc_addline = ""; | |
414 | /* Force repaint on any backward movement */ | |
415 | back_scroll = 0; | |
416 | } | |
417 | ||
418 | if (tgetflag("bs")) | |
419 | sc_backspace = "\b"; | |
420 | else | |
421 | { | |
422 | sc_backspace = tgetstr("bc", &sp); | |
423 | if (sc_backspace == NULL || *sc_backspace == '\0') | |
424 | sc_backspace = "\b"; | |
425 | } | |
426 | } | |
427 | ||
428 | ||
429 | /* | |
430 | * Below are the functions which perform all the | |
431 | * terminal-specific screen manipulation. | |
432 | */ | |
433 | ||
434 | ||
435 | /* | |
436 | * Initialize terminal | |
437 | */ | |
438 | public void | |
439 | init() | |
440 | { | |
441 | tputs(sc_init, sc_height, putchr); | |
442 | } | |
443 | ||
444 | /* | |
445 | * Deinitialize terminal | |
446 | */ | |
447 | public void | |
448 | deinit() | |
449 | { | |
450 | tputs(sc_deinit, sc_height, putchr); | |
451 | } | |
452 | ||
453 | /* | |
454 | * Home cursor (move to upper left corner of screen). | |
455 | */ | |
456 | public void | |
457 | home() | |
458 | { | |
459 | tputs(sc_home, 1, putchr); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Add a blank line (called with cursor at home). | |
464 | * Should scroll the display down. | |
465 | */ | |
466 | public void | |
467 | add_line() | |
468 | { | |
469 | tputs(sc_addline, sc_height, putchr); | |
470 | } | |
471 | ||
472 | /* | |
473 | * Move cursor to lower left corner of screen. | |
474 | */ | |
475 | public void | |
476 | lower_left() | |
477 | { | |
478 | tputs(sc_lower_left, 1, putchr); | |
479 | } | |
480 | ||
481 | /* | |
482 | * Ring the terminal bell. | |
483 | */ | |
484 | public void | |
485 | bell() | |
486 | { | |
487 | if (quiet == VERY_QUIET) | |
488 | vbell(); | |
489 | else | |
490 | putchr('\7'); | |
491 | } | |
492 | ||
493 | /* | |
494 | * Output the "visual bell", if there is one. | |
495 | */ | |
496 | public void | |
497 | vbell() | |
498 | { | |
499 | if (*sc_visual_bell == '\0') | |
500 | return; | |
501 | tputs(sc_visual_bell, sc_height, putchr); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Clear the screen. | |
506 | */ | |
507 | public void | |
508 | clear() | |
509 | { | |
510 | tputs(sc_clear, sc_height, putchr); | |
511 | } | |
512 | ||
513 | /* | |
514 | * Clear from the cursor to the end of the cursor's line. | |
515 | * {{ This must not move the cursor. }} | |
516 | */ | |
517 | public void | |
518 | clear_eol() | |
519 | { | |
520 | tputs(sc_eol_clear, 1, putchr); | |
521 | } | |
522 | ||
523 | /* | |
524 | * Begin "standout" (bold, underline, or whatever). | |
525 | */ | |
526 | public void | |
527 | so_enter() | |
528 | { | |
529 | tputs(sc_s_in, 1, putchr); | |
530 | } | |
531 | ||
532 | /* | |
533 | * End "standout". | |
534 | */ | |
535 | public void | |
536 | so_exit() | |
537 | { | |
538 | tputs(sc_s_out, 1, putchr); | |
539 | } | |
540 | ||
541 | /* | |
542 | * Begin "underline" (hopefully real underlining, | |
543 | * otherwise whatever the terminal provides). | |
544 | */ | |
545 | public void | |
546 | ul_enter() | |
547 | { | |
548 | tputs(sc_u_in, 1, putchr); | |
549 | } | |
550 | ||
551 | /* | |
552 | * End "underline". | |
553 | */ | |
554 | public void | |
555 | ul_exit() | |
556 | { | |
557 | tputs(sc_u_out, 1, putchr); | |
558 | } | |
559 | ||
560 | /* | |
561 | * Begin "bold" | |
562 | */ | |
563 | public void | |
564 | bo_enter() | |
565 | { | |
566 | tputs(sc_b_in, 1, putchr); | |
567 | } | |
568 | ||
569 | /* | |
570 | * End "bold". | |
571 | */ | |
572 | public void | |
573 | bo_exit() | |
574 | { | |
575 | tputs(sc_b_out, 1, putchr); | |
576 | } | |
577 | ||
578 | /* | |
579 | * Erase the character to the left of the cursor | |
580 | * and move the cursor left. | |
581 | */ | |
582 | public void | |
583 | backspace() | |
584 | { | |
585 | /* | |
586 | * Try to erase the previous character by overstriking with a space. | |
587 | */ | |
588 | tputs(sc_backspace, 1, putchr); | |
589 | putchr(' '); | |
590 | tputs(sc_backspace, 1, putchr); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Output a plain backspace, without erasing the previous char. | |
595 | */ | |
596 | public void | |
597 | putbs() | |
598 | { | |
599 | tputs(sc_backspace, 1, putchr); | |
600 | } |