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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 | * | |
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6 | * Redistribution and use in source and binary forms are permitted |
7 | * provided that the above copyright notice and this paragraph are | |
8 | * duplicated in all such forms and that any documentation, | |
9 | * advertising materials, and other materials related to such | |
10 | * distribution and use acknowledge that the software was developed | |
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11 | * by Mark Nudleman and the University of California, Berkeley. The |
12 | * name of Mark Nudleman or the | |
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13 | * University may not be used to endorse or promote products derived |
14 | * from this software without specific prior written permission. | |
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
18 | */ | |
19 | ||
20 | #ifndef lint | |
4a7551ea | 21 | static char sccsid[] = "@(#)screen.c 5.6 (Berkeley) %G%"; |
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22 | #endif /* not lint */ |
23 | ||
24 | /* | |
25 | * Routines which deal with the characteristics of the terminal. | |
26 | * Uses termcap to be as terminal-independent as possible. | |
27 | * | |
28 | * {{ Someday this should be rewritten to use curses. }} | |
29 | */ | |
30 | ||
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31 | #include <stdio.h> |
32 | #include <less.h> | |
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33 | |
34 | #if TERMIO | |
35 | #include <termio.h> | |
36 | #else | |
37 | #include <sgtty.h> | |
38 | #endif | |
39 | ||
40 | #ifdef TIOCGWINSZ | |
41 | #include <sys/ioctl.h> | |
42 | #else | |
43 | /* | |
44 | * For the Unix PC (ATT 7300 & 3B1): | |
45 | * Since WIOCGETD is defined in sys/window.h, we can't use that to decide | |
46 | * whether to include sys/window.h. Use SIGPHONE from sys/signal.h instead. | |
47 | */ | |
48 | #include <sys/signal.h> | |
49 | #ifdef SIGPHONE | |
50 | #include <sys/window.h> | |
51 | #endif | |
52 | #endif | |
53 | ||
54 | /* | |
55 | * Strings passed to tputs() to do various terminal functions. | |
56 | */ | |
57 | static char | |
58 | *sc_pad, /* Pad string */ | |
59 | *sc_home, /* Cursor home */ | |
60 | *sc_addline, /* Add line, scroll down following lines */ | |
61 | *sc_lower_left, /* Cursor to last line, first column */ | |
62 | *sc_move, /* General cursor positioning */ | |
63 | *sc_clear, /* Clear screen */ | |
64 | *sc_eol_clear, /* Clear to end of line */ | |
65 | *sc_s_in, /* Enter standout (highlighted) mode */ | |
66 | *sc_s_out, /* Exit standout mode */ | |
67 | *sc_u_in, /* Enter underline mode */ | |
68 | *sc_u_out, /* Exit underline mode */ | |
69 | *sc_b_in, /* Enter bold mode */ | |
70 | *sc_b_out, /* Exit bold mode */ | |
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71 | *sc_backspace, /* Backspace cursor */ |
72 | *sc_init, /* Startup terminal initialization */ | |
73 | *sc_deinit; /* Exit terminal de-intialization */ | |
74 | ||
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75 | int auto_wrap; /* Terminal does \r\n when write past margin */ |
76 | int ignaw; /* Terminal ignores \n immediately after wrap */ | |
77 | /* The user's erase and line-kill chars */ | |
78 | int erase_char, kill_char, werase_char; | |
79 | int sc_width, sc_height = -1; /* Height & width of screen */ | |
80 | int sc_window = -1; /* window size for forward and backward */ | |
81 | int bo_width, be_width; /* Printing width of boldface sequences */ | |
82 | int ul_width, ue_width; /* Printing width of underline sequences */ | |
83 | int so_width, se_width; /* Printing width of standout sequences */ | |
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84 | |
85 | /* | |
86 | * These two variables are sometimes defined in, | |
87 | * and needed by, the termcap library. | |
88 | * It may be necessary on some systems to declare them extern here. | |
89 | */ | |
90 | /*extern*/ short ospeed; /* Terminal output baud rate */ | |
91 | /*extern*/ char PC; /* Pad character */ | |
92 | ||
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93 | extern int back_scroll; |
94 | char *tgetstr(); | |
95 | char *tgoto(); | |
96 | ||
97 | /* | |
98 | * Change terminal to "raw mode", or restore to "normal" mode. | |
99 | * "Raw mode" means | |
100 | * 1. An outstanding read will complete on receipt of a single keystroke. | |
101 | * 2. Input is not echoed. | |
102 | * 3. On output, \n is mapped to \r\n. | |
103 | * 4. \t is NOT expanded into spaces. | |
104 | * 5. Signal-causing characters such as ctrl-C (interrupt), | |
105 | * etc. are NOT disabled. | |
106 | * It doesn't matter whether an input \n is mapped to \r, or vice versa. | |
107 | */ | |
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108 | raw_mode(on) |
109 | int on; | |
110 | { | |
111 | #if TERMIO | |
112 | struct termio s; | |
113 | static struct termio save_term; | |
114 | ||
115 | if (on) | |
116 | { | |
117 | /* | |
118 | * Get terminal modes. | |
119 | */ | |
966c6ec0 | 120 | (void)ioctl(2, TCGETA, &s); |
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121 | |
122 | /* | |
123 | * Save modes and set certain variables dependent on modes. | |
124 | */ | |
125 | save_term = s; | |
126 | ospeed = s.c_cflag & CBAUD; | |
127 | erase_char = s.c_cc[VERASE]; | |
128 | kill_char = s.c_cc[VKILL]; | |
966c6ec0 | 129 | werase_char = s.c_cc[VWERASE]; |
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130 | |
131 | /* | |
132 | * Set the modes to the way we want them. | |
133 | */ | |
134 | s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL); | |
135 | s.c_oflag |= (OPOST|ONLCR|TAB3); | |
136 | s.c_oflag &= ~(OCRNL|ONOCR|ONLRET); | |
137 | s.c_cc[VMIN] = 1; | |
138 | s.c_cc[VTIME] = 0; | |
139 | } else | |
140 | { | |
141 | /* | |
142 | * Restore saved modes. | |
143 | */ | |
144 | s = save_term; | |
145 | } | |
966c6ec0 | 146 | (void)ioctl(2, TCSETAW, &s); |
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147 | #else |
148 | struct sgttyb s; | |
149 | static struct sgttyb save_term; | |
150 | ||
151 | if (on) | |
152 | { | |
153 | /* | |
154 | * Get terminal modes. | |
155 | */ | |
966c6ec0 | 156 | (void)ioctl(2, TIOCGETP, &s); |
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157 | |
158 | /* | |
159 | * Save modes and set certain variables dependent on modes. | |
160 | */ | |
161 | save_term = s; | |
162 | ospeed = s.sg_ospeed; | |
163 | erase_char = s.sg_erase; | |
164 | kill_char = s.sg_kill; | |
966c6ec0 | 165 | werase_char = -1; |
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166 | |
167 | /* | |
168 | * Set the modes to the way we want them. | |
169 | */ | |
170 | s.sg_flags |= CBREAK; | |
171 | s.sg_flags &= ~(ECHO|XTABS); | |
172 | } else | |
173 | { | |
174 | /* | |
175 | * Restore saved modes. | |
176 | */ | |
177 | s = save_term; | |
178 | } | |
966c6ec0 | 179 | (void)ioctl(2, TIOCSETN, &s); |
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180 | #endif |
181 | } | |
182 | ||
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183 | /* |
184 | * Get terminal capabilities via termcap. | |
185 | */ | |
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186 | get_term() |
187 | { | |
188 | char termbuf[2048]; | |
189 | char *sp; | |
190 | char *term; | |
191 | int hard; | |
192 | #ifdef TIOCGWINSZ | |
193 | struct winsize w; | |
194 | #else | |
195 | #ifdef WIOCGETD | |
196 | struct uwdata w; | |
197 | #endif | |
198 | #endif | |
199 | static char sbuf[1024]; | |
200 | ||
bd410f1f | 201 | char *getenv(), *strcpy(); |
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202 | |
203 | /* | |
204 | * Find out what kind of terminal this is. | |
205 | */ | |
206 | if ((term = getenv("TERM")) == NULL) | |
207 | term = "unknown"; | |
208 | if (tgetent(termbuf, term) <= 0) | |
bd410f1f | 209 | (void)strcpy(termbuf, "dumb:co#80:hc:"); |
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210 | |
211 | /* | |
212 | * Get size of the screen. | |
213 | */ | |
214 | #ifdef TIOCGWINSZ | |
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215 | if (ioctl(2, TIOCGWINSZ, &w) == 0 && w.ws_row > 0) |
216 | sc_height = w.ws_row; | |
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217 | #else |
218 | #ifdef WIOCGETD | |
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219 | if (ioctl(2, WIOCGETD, &w) == 0 && w.uw_height > 0) |
220 | sc_height = w.uw_height/w.uw_vs; | |
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221 | #endif |
222 | #endif | |
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223 | else |
224 | sc_height = tgetnum("li"); | |
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225 | hard = (sc_height < 0 || tgetflag("hc")); |
226 | if (hard) { | |
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227 | /* Oh no, this is a hardcopy terminal. */ |
228 | sc_height = 24; | |
229 | } | |
230 | ||
231 | #ifdef TIOCGWINSZ | |
232 | if (ioctl(2, TIOCGWINSZ, &w) == 0 && w.ws_col > 0) | |
233 | sc_width = w.ws_col; | |
234 | else | |
235 | #ifdef WIOCGETD | |
236 | if (ioctl(2, WIOCGETD, &w) == 0 && w.uw_width > 0) | |
237 | sc_width = w.uw_width/w.uw_hs; | |
238 | else | |
239 | #endif | |
240 | #endif | |
241 | sc_width = tgetnum("co"); | |
242 | if (sc_width < 0) | |
243 | sc_width = 80; | |
244 | ||
245 | auto_wrap = tgetflag("am"); | |
246 | ignaw = tgetflag("xn"); | |
247 | ||
248 | /* | |
249 | * Assumes termcap variable "sg" is the printing width of | |
250 | * the standout sequence, the end standout sequence, | |
251 | * the underline sequence, the end underline sequence, | |
252 | * the boldface sequence, and the end boldface sequence. | |
253 | */ | |
254 | if ((so_width = tgetnum("sg")) < 0) | |
255 | so_width = 0; | |
256 | be_width = bo_width = ue_width = ul_width = se_width = so_width; | |
257 | ||
258 | /* | |
259 | * Get various string-valued capabilities. | |
260 | */ | |
261 | sp = sbuf; | |
262 | ||
263 | sc_pad = tgetstr("pc", &sp); | |
264 | if (sc_pad != NULL) | |
265 | PC = *sc_pad; | |
266 | ||
267 | sc_init = tgetstr("ti", &sp); | |
268 | if (sc_init == NULL) | |
269 | sc_init = ""; | |
270 | ||
271 | sc_deinit= tgetstr("te", &sp); | |
272 | if (sc_deinit == NULL) | |
273 | sc_deinit = ""; | |
274 | ||
275 | sc_eol_clear = tgetstr("ce", &sp); | |
276 | if (hard || sc_eol_clear == NULL || *sc_eol_clear == '\0') | |
277 | { | |
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278 | sc_eol_clear = ""; |
279 | } | |
280 | ||
281 | sc_clear = tgetstr("cl", &sp); | |
282 | if (hard || sc_clear == NULL || *sc_clear == '\0') | |
283 | { | |
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284 | sc_clear = "\n\n"; |
285 | } | |
286 | ||
287 | sc_move = tgetstr("cm", &sp); | |
288 | if (hard || sc_move == NULL || *sc_move == '\0') | |
289 | { | |
290 | /* | |
291 | * This is not an error here, because we don't | |
292 | * always need sc_move. | |
293 | * We need it only if we don't have home or lower-left. | |
294 | */ | |
295 | sc_move = ""; | |
296 | } | |
297 | ||
298 | sc_s_in = tgetstr("so", &sp); | |
299 | if (hard || sc_s_in == NULL) | |
300 | sc_s_in = ""; | |
301 | ||
302 | sc_s_out = tgetstr("se", &sp); | |
303 | if (hard || sc_s_out == NULL) | |
304 | sc_s_out = ""; | |
305 | ||
306 | sc_u_in = tgetstr("us", &sp); | |
307 | if (hard || sc_u_in == NULL) | |
308 | sc_u_in = sc_s_in; | |
309 | ||
310 | sc_u_out = tgetstr("ue", &sp); | |
311 | if (hard || sc_u_out == NULL) | |
312 | sc_u_out = sc_s_out; | |
313 | ||
314 | sc_b_in = tgetstr("md", &sp); | |
315 | if (hard || sc_b_in == NULL) | |
316 | { | |
317 | sc_b_in = sc_s_in; | |
318 | sc_b_out = sc_s_out; | |
319 | } else | |
320 | { | |
321 | sc_b_out = tgetstr("me", &sp); | |
322 | if (hard || sc_b_out == NULL) | |
323 | sc_b_out = ""; | |
324 | } | |
325 | ||
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326 | sc_home = tgetstr("ho", &sp); |
327 | if (hard || sc_home == NULL || *sc_home == '\0') | |
328 | { | |
329 | if (*sc_move == '\0') | |
330 | { | |
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331 | /* |
332 | * This last resort for sc_home is supposed to | |
333 | * be an up-arrow suggesting moving to the | |
334 | * top of the "virtual screen". (The one in | |
335 | * your imagination as you try to use this on | |
336 | * a hard copy terminal.) | |
337 | */ | |
b2796622 | 338 | sc_home = "|\b^"; |
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339 | } else |
340 | { | |
341 | /* | |
342 | * No "home" string, | |
343 | * but we can use "move(0,0)". | |
344 | */ | |
bd410f1f | 345 | (void)strcpy(sp, tgoto(sc_move, 0, 0)); |
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346 | sc_home = sp; |
347 | sp += strlen(sp) + 1; | |
348 | } | |
349 | } | |
350 | ||
351 | sc_lower_left = tgetstr("ll", &sp); | |
352 | if (hard || sc_lower_left == NULL || *sc_lower_left == '\0') | |
353 | { | |
354 | if (*sc_move == '\0') | |
355 | { | |
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356 | sc_lower_left = "\r"; |
357 | } else | |
358 | { | |
359 | /* | |
360 | * No "lower-left" string, | |
361 | * but we can use "move(0,last-line)". | |
362 | */ | |
bd410f1f | 363 | (void)strcpy(sp, tgoto(sc_move, 0, sc_height-1)); |
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364 | sc_lower_left = sp; |
365 | sp += strlen(sp) + 1; | |
366 | } | |
367 | } | |
368 | ||
369 | /* | |
370 | * To add a line at top of screen and scroll the display down, | |
371 | * we use "al" (add line) or "sr" (scroll reverse). | |
372 | */ | |
373 | if ((sc_addline = tgetstr("al", &sp)) == NULL || | |
374 | *sc_addline == '\0') | |
375 | sc_addline = tgetstr("sr", &sp); | |
376 | ||
377 | if (hard || sc_addline == NULL || *sc_addline == '\0') | |
378 | { | |
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379 | sc_addline = ""; |
380 | /* Force repaint on any backward movement */ | |
381 | back_scroll = 0; | |
382 | } | |
383 | ||
384 | if (tgetflag("bs")) | |
385 | sc_backspace = "\b"; | |
386 | else | |
387 | { | |
388 | sc_backspace = tgetstr("bc", &sp); | |
389 | if (sc_backspace == NULL || *sc_backspace == '\0') | |
390 | sc_backspace = "\b"; | |
391 | } | |
392 | } | |
393 | ||
394 | ||
395 | /* | |
396 | * Below are the functions which perform all the | |
397 | * terminal-specific screen manipulation. | |
398 | */ | |
399 | ||
966c6ec0 | 400 | int putchr(); |
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401 | |
402 | /* | |
403 | * Initialize terminal | |
404 | */ | |
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405 | init() |
406 | { | |
407 | tputs(sc_init, sc_height, putchr); | |
408 | } | |
409 | ||
410 | /* | |
411 | * Deinitialize terminal | |
412 | */ | |
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413 | deinit() |
414 | { | |
415 | tputs(sc_deinit, sc_height, putchr); | |
416 | } | |
417 | ||
418 | /* | |
419 | * Home cursor (move to upper left corner of screen). | |
420 | */ | |
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421 | home() |
422 | { | |
423 | tputs(sc_home, 1, putchr); | |
424 | } | |
425 | ||
426 | /* | |
427 | * Add a blank line (called with cursor at home). | |
428 | * Should scroll the display down. | |
429 | */ | |
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430 | add_line() |
431 | { | |
432 | tputs(sc_addline, sc_height, putchr); | |
433 | } | |
434 | ||
4a7551ea | 435 | int short_file; /* if file less than a screen */ |
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436 | lower_left() |
437 | { | |
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438 | if (short_file) { |
439 | putchr('\r'); | |
440 | flush(); | |
441 | } | |
442 | else | |
443 | tputs(sc_lower_left, 1, putchr); | |
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444 | } |
445 | ||
446 | /* | |
447 | * Ring the terminal bell. | |
448 | */ | |
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449 | bell() |
450 | { | |
966c6ec0 | 451 | putchr('\7'); |
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452 | } |
453 | ||
454 | /* | |
455 | * Clear the screen. | |
456 | */ | |
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457 | clear() |
458 | { | |
459 | tputs(sc_clear, sc_height, putchr); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Clear from the cursor to the end of the cursor's line. | |
464 | * {{ This must not move the cursor. }} | |
465 | */ | |
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466 | clear_eol() |
467 | { | |
468 | tputs(sc_eol_clear, 1, putchr); | |
469 | } | |
470 | ||
471 | /* | |
472 | * Begin "standout" (bold, underline, or whatever). | |
473 | */ | |
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474 | so_enter() |
475 | { | |
476 | tputs(sc_s_in, 1, putchr); | |
477 | } | |
478 | ||
479 | /* | |
480 | * End "standout". | |
481 | */ | |
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482 | so_exit() |
483 | { | |
484 | tputs(sc_s_out, 1, putchr); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Begin "underline" (hopefully real underlining, | |
489 | * otherwise whatever the terminal provides). | |
490 | */ | |
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491 | ul_enter() |
492 | { | |
493 | tputs(sc_u_in, 1, putchr); | |
494 | } | |
495 | ||
496 | /* | |
497 | * End "underline". | |
498 | */ | |
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499 | ul_exit() |
500 | { | |
501 | tputs(sc_u_out, 1, putchr); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Begin "bold" | |
506 | */ | |
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507 | bo_enter() |
508 | { | |
509 | tputs(sc_b_in, 1, putchr); | |
510 | } | |
511 | ||
512 | /* | |
513 | * End "bold". | |
514 | */ | |
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515 | bo_exit() |
516 | { | |
517 | tputs(sc_b_out, 1, putchr); | |
518 | } | |
519 | ||
520 | /* | |
521 | * Erase the character to the left of the cursor | |
522 | * and move the cursor left. | |
523 | */ | |
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524 | backspace() |
525 | { | |
526 | /* | |
527 | * Try to erase the previous character by overstriking with a space. | |
528 | */ | |
529 | tputs(sc_backspace, 1, putchr); | |
530 | putchr(' '); | |
531 | tputs(sc_backspace, 1, putchr); | |
532 | } | |
533 | ||
534 | /* | |
535 | * Output a plain backspace, without erasing the previous char. | |
536 | */ | |
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537 | putbs() |
538 | { | |
539 | tputs(sc_backspace, 1, putchr); | |
540 | } |