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98fb7faa MH |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include "ex.h" | |
3 | #include "ex_tty.h" | |
4 | #include "ex_vis.h" | |
5 | ||
6 | /* | |
7 | * Deal with the screen, clearing, cursor positioning, putting characters | |
8 | * into the screen image, and deleting characters. | |
9 | * Really hard stuff here is utilizing insert character operations | |
10 | * on intelligent terminals which differs widely from terminal to terminal. | |
11 | */ | |
12 | vclear() | |
13 | { | |
14 | ||
15 | #ifdef ADEBUG | |
16 | if (trace) | |
17 | tfixnl(), fprintf(trace, "------\nvclear\n"); | |
18 | #endif | |
19 | tputs(CL, LINES, putch); | |
20 | destcol = 0; | |
21 | outcol = 0; | |
22 | destline = 0; | |
23 | outline = 0; | |
24 | if (inopen) | |
25 | vclrbyte(vtube0, WCOLS * (WECHO - ZERO + 1)); | |
26 | } | |
27 | ||
28 | /* | |
29 | * Clear memory. | |
30 | */ | |
31 | vclrbyte(cp, i) | |
32 | register char *cp; | |
33 | register int i; | |
34 | { | |
35 | ||
36 | if (i > 0) | |
37 | do | |
38 | *cp++ = 0; | |
39 | while (--i != 0); | |
40 | } | |
41 | ||
42 | /* | |
43 | * Clear a physical display line, high level. | |
44 | */ | |
45 | vclrlin(l, tp) | |
46 | int l; | |
47 | line *tp; | |
48 | { | |
49 | ||
50 | vigoto(l, 0); | |
51 | if ((hold & HOLDAT) == 0) | |
52 | putchar(tp > dol ? ((UPPERCASE || HZ) ? '^' : '~') : '@'); | |
53 | if (state == HARDOPEN) | |
54 | sethard(); | |
55 | vclreol(); | |
56 | } | |
57 | ||
58 | /* | |
59 | * Clear to the end of the current physical line | |
60 | */ | |
61 | vclreol() | |
62 | { | |
63 | register int i, j; | |
64 | register char *tp; | |
65 | ||
66 | if (destcol == WCOLS) | |
67 | return; | |
68 | destline += destcol / WCOLS; | |
69 | destcol %= WCOLS; | |
70 | if (destline < 0 || destline > WECHO) | |
71 | error("Internal error: vclreol"); | |
72 | i = WCOLS - destcol; | |
73 | tp = vtube[destline] + destcol; | |
74 | if (CE) { | |
75 | if (IN && *tp || !ateopr()) { | |
76 | vcsync(); | |
77 | vputp(CE, 1); | |
78 | } | |
79 | vclrbyte(tp, i); | |
80 | return; | |
81 | } | |
82 | if (*tp == 0) | |
83 | return; | |
84 | while (i > 0 && (j = *tp & (QUOTE|TRIM))) { | |
85 | if (j != ' ' && (j & QUOTE) == 0) { | |
86 | destcol = WCOLS - i; | |
87 | vputchar(' '); | |
88 | } | |
89 | --i, *tp++ = 0; | |
90 | } | |
91 | } | |
92 | ||
93 | /* | |
94 | * Clear the echo line. | |
95 | * If didphys then its been cleared physically (as | |
96 | * a side effect of a clear to end of display, e.g.) | |
97 | * so just do it logically. | |
98 | * If work here is being held off, just remember, in | |
99 | * heldech, if work needs to be done, don't do anything. | |
100 | */ | |
101 | vclrech(didphys) | |
102 | bool didphys; | |
103 | { | |
104 | ||
105 | if (Peekkey == ATTN) | |
106 | return; | |
107 | if (hold & HOLDECH) { | |
108 | heldech = !didphys; | |
109 | return; | |
110 | } | |
111 | if (!didphys && (CD || CE)) { | |
112 | splitw++; | |
113 | /* | |
114 | * If display is retained below, then MUST use CD or CE | |
115 | * since we don't really know whats out there. | |
116 | * Vigoto might decide (incorrectly) to do nothing. | |
117 | */ | |
d266c416 MH |
118 | if (DB) { |
119 | vgoto(WECHO, 0); | |
120 | vputp(CD ? CD : CE, 1); | |
121 | } else { | |
122 | if (XT) { | |
123 | /* | |
124 | * This code basically handles the t1061 | |
125 | * where positioning at (0, 0) won't work | |
126 | * because the terminal won't let you put | |
127 | * the cursor on it's magic cookie. | |
128 | * | |
129 | * Should probably be XS above, or even a | |
130 | * new X? glitch, but right now t1061 is the | |
131 | * only terminal with XT. | |
132 | */ | |
133 | vgoto(WECHO, 0); | |
134 | vputp(DL, 1); | |
135 | } else { | |
136 | vigoto(WECHO, 0); | |
137 | vclreol(); | |
138 | } | |
139 | } | |
98fb7faa MH |
140 | splitw = 0; |
141 | didphys = 1; | |
142 | } | |
143 | if (didphys) | |
144 | vclrbyte(vtube[WECHO], WCOLS); | |
145 | heldech = 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Fix the echo area for use, setting | |
150 | * the state variable splitw so we wont rollup | |
151 | * when we move the cursor there. | |
152 | */ | |
153 | fixech() | |
154 | { | |
155 | ||
156 | splitw++; | |
157 | if (state != VISUAL && state != CRTOPEN) { | |
158 | vclean(); | |
159 | vcnt = 0; | |
160 | } | |
161 | vgoto(WECHO, 0); flusho(); | |
162 | } | |
163 | ||
164 | /* | |
165 | * Put the cursor ``before'' cp. | |
166 | */ | |
167 | vcursbef(cp) | |
168 | register char *cp; | |
169 | { | |
170 | ||
171 | if (cp <= linebuf) | |
172 | vgotoCL(value(NUMBER) << 3); | |
173 | else | |
174 | vgotoCL(column(cp - 1) - 1); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Put the cursor ``at'' cp. | |
179 | */ | |
180 | vcursat(cp) | |
181 | register char *cp; | |
182 | { | |
183 | ||
184 | if (cp <= linebuf && linebuf[0] == 0) | |
185 | vgotoCL(value(NUMBER) << 3); | |
186 | else | |
187 | vgotoCL(column(cp - 1)); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Put the cursor ``after'' cp. | |
192 | */ | |
193 | vcursaft(cp) | |
194 | register char *cp; | |
195 | { | |
196 | ||
197 | vgotoCL(column(cp)); | |
198 | } | |
199 | ||
200 | /* | |
201 | * Fix the cursor to be positioned in the correct place | |
202 | * to accept a command. | |
203 | */ | |
204 | vfixcurs() | |
205 | { | |
206 | ||
207 | vsetcurs(cursor); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Compute the column position implied by the cursor at ``nc'', | |
212 | * and move the cursor there. | |
213 | */ | |
214 | vsetcurs(nc) | |
215 | register char *nc; | |
216 | { | |
217 | register int col; | |
218 | ||
219 | col = column(nc); | |
220 | if (linebuf[0]) | |
221 | col--; | |
222 | vgotoCL(col); | |
223 | cursor = nc; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Move the cursor invisibly, i.e. only remember to do it. | |
228 | */ | |
229 | vigoto(y, x) | |
230 | int y, x; | |
231 | { | |
232 | ||
233 | destline = y; | |
234 | destcol = x; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Move the cursor to the position implied by any previous | |
239 | * vigoto (or low level hacking with destcol/destline as in readecho). | |
240 | */ | |
241 | vcsync() | |
242 | { | |
243 | ||
244 | vgoto(destline, destcol); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Goto column x of the current line. | |
249 | */ | |
250 | vgotoCL(x) | |
251 | register int x; | |
252 | { | |
253 | ||
254 | if (splitw) | |
255 | vgoto(WECHO, x); | |
256 | else | |
257 | vgoto(LINE(vcline), x); | |
258 | } | |
259 | ||
260 | /* | |
261 | * Invisible goto column x of current line. | |
262 | */ | |
263 | vigotoCL(x) | |
264 | register int x; | |
265 | { | |
266 | ||
267 | if (splitw) | |
268 | vigoto(WECHO, x); | |
269 | else | |
270 | vigoto(LINE(vcline), x); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Move cursor to line y, column x, handling wraparound and scrolling. | |
275 | */ | |
276 | vgoto(y, x) | |
277 | register int y, x; | |
278 | { | |
279 | register char *tp; | |
280 | register int c; | |
281 | ||
282 | /* | |
283 | * Fold the possibly too large value of x. | |
284 | */ | |
285 | if (x >= WCOLS) { | |
286 | y += x / WCOLS; | |
287 | x %= WCOLS; | |
288 | } | |
289 | if (y < 0) | |
290 | error("Internal error: vgoto"); | |
291 | if (outcol >= WCOLS) { | |
292 | if (AM) { | |
293 | outline += outcol / WCOLS; | |
294 | outcol %= WCOLS; | |
295 | } else | |
296 | outcol = WCOLS - 1; | |
297 | } | |
298 | ||
299 | /* | |
300 | * In a hardcopy or glass crt open, print the stuff | |
301 | * implied by a motion, or backspace. | |
302 | */ | |
303 | if (state == HARDOPEN || state == ONEOPEN) { | |
304 | if (y != outline) | |
305 | error("Line too long for open"); | |
306 | if (x + 1 < outcol - x || (outcol > x && !BS)) | |
307 | destcol = 0, fgoto(); | |
308 | tp = vtube[WBOT] + outcol; | |
309 | while (outcol != x) | |
310 | if (outcol < x) { | |
311 | if (*tp == 0) | |
312 | *tp = ' '; | |
313 | c = *tp++ & TRIM; | |
314 | vputc(c && (!OS || EO) ? c : ' '), outcol++; | |
315 | } else { | |
316 | if (BC) | |
317 | vputp(BC, 0); | |
318 | else | |
319 | vputc('\b'); | |
320 | outcol--; | |
321 | } | |
322 | destcol = outcol = x; | |
323 | destline = outline; | |
324 | return; | |
325 | } | |
326 | ||
327 | /* | |
328 | * If the destination position implies a scroll, do it. | |
329 | */ | |
330 | destline = y; | |
331 | if (destline > WBOT && (!splitw || destline > WECHO)) { | |
332 | endim(); | |
333 | vrollup(destline); | |
334 | } | |
335 | ||
336 | /* | |
337 | * If there really is a motion involved, do it. | |
338 | * The check here is an optimization based on profiling. | |
339 | */ | |
340 | destcol = x; | |
341 | if ((destline - outline) * WCOLS != destcol - outcol) { | |
342 | if (!MI) | |
343 | endim(); | |
344 | fgoto(); | |
345 | } | |
346 | } | |
347 | ||
348 | /* | |
349 | * This is the hardest code in the editor, and deals with insert modes | |
350 | * on different kinds of intelligent terminals. The complexity is due | |
351 | * to the cross product of three factors: | |
352 | * | |
353 | * 1. Lines may display as more than one segment on the screen. | |
354 | * 2. There are 2 kinds of intelligent terminal insert modes. | |
355 | * 3. Tabs squash when you insert characters in front of them, | |
356 | * in a way in which current intelligent terminals don't handle. | |
357 | * | |
358 | * The two kinds of terminals are typified by the DM2500 or HP2645 for | |
359 | * one and the CONCEPT-100 or the FOX for the other. | |
360 | * | |
361 | * The first (HP2645) kind has an insert mode where the characters | |
362 | * fall off the end of the line and the screen is shifted rigidly | |
363 | * no matter how the display came about. | |
364 | * | |
365 | * The second (CONCEPT-100) kind comes from terminals which are designed | |
366 | * for forms editing and which distinguish between blanks and ``spaces'' | |
367 | * on the screen, spaces being like blank, but never having had | |
368 | * and data typed into that screen position (since, e.g. a clear operation | |
369 | * like clear screen). On these terminals, when you insert a character, | |
370 | * the characters from where you are to the end of the screen shift | |
371 | * over till a ``space'' is found, and the null character there gets | |
372 | * eaten up. | |
373 | * | |
374 | * | |
375 | * The code here considers the line as consisting of several parts | |
376 | * the first part is the ``doomed'' part, i.e. a part of the line | |
377 | * which is being typed over. Next comes some text up to the first | |
378 | * following tab. The tab is the next segment of the line, and finally | |
379 | * text after the tab. | |
380 | * | |
381 | * We have to consider each of these segments and the effect of the | |
382 | * insertion of a character on them. On terminals like HP2645's we | |
383 | * must simulate a multi-line insert mode using the primitive one | |
384 | * line insert mode. If we are inserting in front of a tab, we have | |
385 | * to either delete characters from the tab or insert white space | |
386 | * (when the tab reaches a new spot where it gets larger) before we | |
387 | * insert the new character. | |
388 | * | |
389 | * On a terminal like a CONCEPT our strategy is to make all | |
390 | * blanks be displayed, while trying to keep the screen having ``spaces'' | |
391 | * for portions of tabs. In this way the terminal hardward does some | |
392 | * of the hacking for compression of tabs, although this tends to | |
393 | * disappear as you work on the line and spaces change into blanks. | |
394 | * | |
395 | * There are a number of boundary conditions (like typing just before | |
396 | * the first following tab) where we can avoid a lot of work. Most | |
397 | * of them have to be dealt with explicitly because performance is | |
398 | * much, much worse if we don't. | |
399 | * | |
400 | * A final thing which is hacked here is two flavors of insert mode. | |
401 | * Datamedia's do this by an insert mode which you enter and leave | |
402 | * and by having normal motion character operate differently in this | |
403 | * mode, notably by having a newline insert a line on the screen in | |
404 | * this mode. This generally means it is unsafe to move around | |
405 | * the screen ignoring the fact that we are in this mode. | |
406 | * This is possible on some terminals, and wins big (e.g. HP), so | |
407 | * we encode this as a ``can move in insert capability'' mi, | |
408 | * and terminals which have it can do insert mode with much less | |
409 | * work when tabs are present following the cursor on the current line. | |
410 | */ | |
411 | ||
412 | /* | |
413 | * Routine to expand a tab, calling the normal Outchar routine | |
414 | * to put out each implied character. Note that we call outchar | |
415 | * with a QUOTE. We use QUOTE internally to represent a position | |
416 | * which is part of the expansion of a tab. | |
417 | */ | |
418 | vgotab() | |
419 | { | |
d266c416 | 420 | register int i = tabcol(destcol, value(TABSTOP)) - destcol; |
98fb7faa MH |
421 | |
422 | do | |
423 | (*Outchar)(QUOTE); | |
d266c416 | 424 | while (--i); |
98fb7faa MH |
425 | } |
426 | ||
427 | /* | |
428 | * Variables for insert mode. | |
429 | */ | |
430 | int linend; /* The column position of end of line */ | |
431 | int tabstart; /* Column of start of first following tab */ | |
432 | int tabend; /* Column of end of following tabs */ | |
433 | int tabsize; /* Size of the following tabs */ | |
434 | int tabslack; /* Number of ``spaces'' in following tabs */ | |
435 | int inssiz; /* Number of characters to be inserted */ | |
436 | int inscol; /* Column where insertion is taking place */ | |
437 | int shft; /* Amount tab expansion shifted rest of line */ | |
438 | int slakused; /* This much of tabslack will be used up */ | |
439 | ||
440 | /* | |
441 | * This routine MUST be called before insert mode is run, | |
442 | * and brings all segments of the current line to the top | |
443 | * of the screen image buffer so it is easier for us to | |
444 | * maniuplate them. | |
445 | */ | |
446 | vprepins() | |
447 | { | |
448 | register int i; | |
449 | register char *cp = vtube0; | |
450 | ||
451 | for (i = 0; i < DEPTH(vcline); i++) { | |
452 | vmaktop(LINE(vcline) + i, cp); | |
453 | cp += WCOLS; | |
454 | } | |
455 | } | |
456 | ||
457 | vmaktop(p, cp) | |
458 | register int p; | |
459 | char *cp; | |
460 | { | |
461 | register int i; | |
462 | char temp[TUBECOLS]; | |
463 | ||
d266c416 | 464 | if (p < 0 || vtube[p] == cp) |
98fb7faa MH |
465 | return; |
466 | for (i = ZERO; i <= WECHO; i++) | |
467 | if (vtube[i] == cp) { | |
468 | copy(temp, vtube[i], WCOLS); | |
469 | copy(vtube[i], vtube[p], WCOLS); | |
470 | copy(vtube[p], temp, WCOLS); | |
471 | vtube[i] = vtube[p]; | |
472 | vtube[p] = cp; | |
473 | return; | |
474 | } | |
475 | error("Line too long"); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Insert character c at current cursor position. | |
480 | * Multi-character inserts occur only as a result | |
481 | * of expansion of tabs (i.e. inssize == 1 except | |
482 | * for tabs) and code assumes this in several place | |
483 | * to make life simpler. | |
484 | */ | |
485 | vinschar(c) | |
486 | char c; | |
487 | { | |
488 | register int i; | |
489 | register char *tp; | |
490 | ||
491 | if ((!IM || !EI) && ((hold & HOLDQIK) || !value(REDRAW) || value(SLOWOPEN))) { | |
492 | /* | |
493 | * Don't want to try to use terminal | |
494 | * insert mode, or to try to fake it. | |
495 | * Just put the character out; the screen | |
496 | * will probably be wrong but we will fix it later. | |
497 | */ | |
498 | if (c == '\t') { | |
499 | vgotab(); | |
500 | return; | |
501 | } | |
502 | vputchar(c); | |
503 | if (DEPTH(vcline) * WCOLS + !value(REDRAW) > | |
504 | (destline - LINE(vcline)) * WCOLS + destcol) | |
505 | return; | |
506 | /* | |
507 | * The next line is about to be clobbered | |
508 | * make space for another segment of this line | |
509 | * (on an intelligent terminal) or just remember | |
510 | * that next line was clobbered (on a dumb one | |
511 | * if we don't care to redraw the tail. | |
512 | */ | |
513 | if (AL) { | |
514 | vnpins(0); | |
515 | } else { | |
516 | c = LINE(vcline) + DEPTH(vcline); | |
517 | if (c < LINE(vcline + 1) || c > WBOT) | |
518 | return; | |
519 | i = destcol; | |
520 | vinslin(c, 1, vcline); | |
521 | DEPTH(vcline)++; | |
522 | vigoto(c, i); | |
523 | vprepins(); | |
524 | } | |
525 | return; | |
526 | } | |
527 | /* | |
528 | * Compute the number of positions in the line image of the | |
529 | * current line. This is done from the physical image | |
530 | * since that is faster. Note that we have no memory | |
531 | * from insertion to insertion so that routines which use | |
532 | * us don't have to worry about moving the cursor around. | |
533 | */ | |
534 | if (*vtube0 == 0) | |
535 | linend = 0; | |
536 | else { | |
537 | /* | |
538 | * Search backwards for a non-null character | |
539 | * from the end of the displayed line. | |
540 | */ | |
541 | i = WCOLS * DEPTH(vcline); | |
542 | if (i == 0) | |
543 | i = WCOLS; | |
544 | tp = vtube0 + i; | |
545 | while (*--tp == 0) | |
546 | if (--i == 0) | |
547 | break; | |
548 | linend = i; | |
549 | } | |
550 | ||
551 | /* | |
552 | * We insert at a position based on the physical location | |
553 | * of the output cursor. | |
554 | */ | |
555 | inscol = destcol + (destline - LINE(vcline)) * WCOLS; | |
556 | if (c == '\t') { | |
557 | /* | |
558 | * Characters inserted from a tab must be | |
559 | * remembered as being part of a tab, but we can't | |
560 | * use QUOTE here since we really need to print blanks. | |
561 | * QUOTE|' ' is the representation of this. | |
562 | */ | |
d266c416 | 563 | inssiz = tabcol(inscol, value(TABSTOP)) - inscol; |
98fb7faa MH |
564 | c = ' ' | QUOTE; |
565 | } else | |
566 | inssiz = 1; | |
567 | ||
568 | /* | |
569 | * If the text to be inserted is less than the number | |
570 | * of doomed positions, then we don't need insert mode, | |
571 | * rather we can just typeover. | |
572 | */ | |
573 | if (inssiz <= doomed) { | |
574 | endim(); | |
575 | if (inscol != linend) | |
576 | doomed -= inssiz; | |
577 | do | |
578 | vputchar(c); | |
579 | while (--inssiz); | |
580 | return; | |
581 | } | |
582 | ||
583 | /* | |
584 | * Have to really do some insertion, thus | |
585 | * stake out the bounds of the first following | |
586 | * group of tabs, computing starting position, | |
587 | * ending position, and the number of ``spaces'' therein | |
588 | * so we can tell how much it will squish. | |
589 | */ | |
590 | tp = vtube0 + inscol; | |
591 | for (i = inscol; i < linend; i++) | |
592 | if (*tp++ & QUOTE) { | |
593 | --tp; | |
594 | break; | |
595 | } | |
596 | tabstart = tabend = i; | |
597 | tabslack = 0; | |
598 | while (tabend < linend) { | |
599 | i = *tp++; | |
600 | if ((i & QUOTE) == 0) | |
601 | break; | |
602 | if ((i & TRIM) == 0) | |
603 | tabslack++; | |
604 | tabsize++; | |
605 | tabend++; | |
606 | } | |
607 | tabsize = tabend - tabstart; | |
608 | ||
609 | /* | |
610 | * For HP's and DM's, e.g. tabslack has no meaning. | |
611 | */ | |
612 | if (!IN) | |
613 | tabslack = 0; | |
614 | #ifdef IDEBUG | |
615 | if (trace) { | |
616 | fprintf(trace, "inscol %d, inssiz %d, tabstart %d, ", | |
617 | inscol, inssiz, tabstart); | |
618 | fprintf(trace, "tabend %d, tabslack %d, linend %d\n", | |
619 | tabend, tabslack, linend); | |
620 | } | |
621 | #endif | |
622 | ||
623 | /* | |
624 | * The real work begins. | |
625 | */ | |
626 | slakused = 0; | |
627 | shft = 0; | |
628 | if (tabsize) { | |
629 | /* | |
630 | * There are tabs on this line. | |
631 | * If they need to expand, then the rest of the line | |
632 | * will have to be shifted over. In this case, | |
633 | * we will need to make sure there are no ``spaces'' | |
634 | * in the rest of the line (on e.g. CONCEPT-100) | |
635 | * and then grab another segment on the screen if this | |
636 | * line is now deeper. We then do the shift | |
637 | * implied by the insertion. | |
638 | */ | |
d266c416 | 639 | if (inssiz >= doomed + tabcol(tabstart, value(TABSTOP)) - tabstart) { |
98fb7faa MH |
640 | if (IN) |
641 | vrigid(); | |
642 | vneedpos(value(TABSTOP)); | |
643 | vishft(); | |
644 | } | |
645 | } else if (inssiz > doomed) | |
646 | /* | |
647 | * No tabs, but line may still get deeper. | |
648 | */ | |
649 | vneedpos(inssiz - doomed); | |
650 | /* | |
651 | * Now put in the inserted characters. | |
652 | */ | |
653 | viin(c); | |
654 | ||
655 | /* | |
656 | * Now put the cursor in its final resting place. | |
657 | */ | |
658 | destline = LINE(vcline); | |
659 | destcol = inscol + inssiz; | |
660 | vcsync(); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Rigidify the rest of the line after the first | |
665 | * group of following tabs, typing blanks over ``spaces''. | |
666 | */ | |
667 | vrigid() | |
668 | { | |
669 | register int col; | |
670 | register char *tp = vtube0 + tabend; | |
671 | ||
672 | for (col = tabend; col < linend; col++) | |
673 | if ((*tp++ & TRIM) == 0) { | |
674 | endim(); | |
675 | vgotoCL(col); | |
676 | vputchar(' ' | QUOTE); | |
677 | } | |
678 | } | |
679 | ||
680 | /* | |
681 | * We need cnt more positions on this line. | |
682 | * Open up new space on the screen (this may in fact be a | |
683 | * screen rollup). | |
684 | * | |
685 | * On a dumb terminal we may infact redisplay the rest of the | |
686 | * screen here brute force to keep it pretty. | |
687 | */ | |
688 | vneedpos(cnt) | |
689 | int cnt; | |
690 | { | |
691 | register int d = DEPTH(vcline); | |
692 | register int rmdr = d * WCOLS - linend; | |
693 | ||
694 | if (cnt <= rmdr - IN) | |
695 | return; | |
696 | endim(); | |
697 | vnpins(1); | |
698 | } | |
699 | ||
700 | vnpins(dosync) | |
701 | int dosync; | |
702 | { | |
703 | register int d = DEPTH(vcline); | |
704 | register int e; | |
705 | ||
706 | e = LINE(vcline) + DEPTH(vcline); | |
707 | if (e < LINE(vcline + 1)) { | |
708 | vigoto(e, 0); | |
709 | vclreol(); | |
710 | return; | |
711 | } | |
712 | DEPTH(vcline)++; | |
713 | if (e < WECHO) { | |
714 | e = vglitchup(vcline, d); | |
715 | vigoto(e, 0); vclreol(); | |
716 | if (dosync) { | |
717 | Outchar = vputchar; | |
718 | vsync(e + 1); | |
719 | Outchar = vinschar; | |
720 | } | |
721 | } else { | |
722 | vup1(); | |
723 | vigoto(WBOT, 0); | |
724 | vclreol(); | |
725 | } | |
726 | vprepins(); | |
727 | } | |
728 | ||
729 | /* | |
730 | * Do the shift of the next tabstop implied by | |
731 | * insertion so it expands. | |
732 | */ | |
733 | vishft() | |
734 | { | |
735 | int tshft = 0; | |
736 | int j; | |
737 | register int i; | |
738 | register char *tp = vtube0; | |
739 | register char *up; | |
740 | short oldhold = hold; | |
741 | ||
742 | shft = value(TABSTOP); | |
743 | hold |= HOLDPUPD; | |
744 | if (!IM && !EI) { | |
745 | /* | |
746 | * Dumb terminals are easy, we just have | |
747 | * to retype the text. | |
748 | */ | |
749 | vigotoCL(tabend + shft); | |
750 | up = tp + tabend; | |
751 | for (i = tabend; i < linend; i++) | |
752 | vputchar(*up++); | |
753 | } else if (IN) { | |
754 | /* | |
755 | * CONCEPT-like terminals do most of the work for us, | |
756 | * we don't have to muck with simulation of multi-line | |
757 | * insert mode. Some of the shifting may come for free | |
758 | * also if the tabs don't have enough slack to take up | |
759 | * all the inserted characters. | |
760 | */ | |
761 | i = shft; | |
762 | slakused = inssiz - doomed; | |
763 | if (slakused > tabslack) { | |
764 | i -= slakused - tabslack; | |
765 | slakused -= tabslack; | |
766 | } | |
767 | if (i > 0 && tabend != linend) { | |
768 | tshft = i; | |
769 | vgotoCL(tabend); | |
770 | goim(); | |
771 | do | |
772 | vputchar(' ' | QUOTE); | |
773 | while (--i); | |
774 | } | |
775 | } else { | |
776 | /* | |
777 | * HP and Datamedia type terminals have to have multi-line | |
778 | * insert faked. Hack each segment after where we are | |
779 | * (going backwards to where we are.) We then can | |
780 | * hack the segment where the end of the first following | |
781 | * tab group is. | |
782 | */ | |
783 | for (j = DEPTH(vcline) - 1; j > (tabend + shft) / WCOLS; j--) { | |
784 | vgotoCL(j * WCOLS); | |
785 | goim(); | |
786 | up = tp + j * WCOLS - shft; | |
787 | i = shft; | |
887e3e0d MH |
788 | do { |
789 | if (*up) | |
790 | vputchar(*up++); | |
791 | else | |
792 | break; | |
793 | } while (--i); | |
98fb7faa MH |
794 | } |
795 | vigotoCL(tabstart); | |
796 | i = shft - (inssiz - doomed); | |
797 | if (i > 0) { | |
798 | tabslack = inssiz - doomed; | |
799 | vcsync(); | |
800 | goim(); | |
801 | do | |
802 | vputchar(' '); | |
803 | while (--i); | |
804 | } | |
805 | } | |
806 | /* | |
807 | * Now do the data moving in the internal screen | |
808 | * image which is common to all three cases. | |
809 | */ | |
810 | tp += linend; | |
811 | up = tp + shft; | |
812 | i = linend - tabend; | |
813 | if (i > 0) | |
814 | do | |
815 | *--up = *--tp; | |
816 | while (--i); | |
817 | if (IN && tshft) { | |
818 | i = tshft; | |
819 | do | |
820 | *--up = ' ' | QUOTE; | |
821 | while (--i); | |
822 | } | |
823 | hold = oldhold; | |
824 | } | |
825 | ||
826 | /* | |
827 | * Now do the insert of the characters (finally). | |
828 | */ | |
829 | viin(c) | |
830 | char c; | |
831 | { | |
832 | register char *tp, *up; | |
833 | register int i, j; | |
834 | register bool noim = 0; | |
835 | int remdoom; | |
836 | short oldhold = hold; | |
837 | ||
838 | hold |= HOLDPUPD; | |
839 | if (tabsize && (IM && EI) && inssiz - doomed > tabslack) | |
840 | /* | |
841 | * There is a tab out there which will be affected | |
842 | * by the insertion since there aren't enough doomed | |
843 | * characters to take up all the insertion and we do | |
844 | * have insert mode capability. | |
845 | */ | |
846 | if (inscol + doomed == tabstart) { | |
847 | /* | |
848 | * The end of the doomed characters sits right at the | |
849 | * start of the tabs, then we don't need to use insert | |
850 | * mode; unless the tab has already been expanded | |
851 | * in which case we MUST use insert mode. | |
852 | */ | |
853 | slakused = 0; | |
854 | noim = !shft; | |
855 | } else { | |
856 | /* | |
857 | * The last really special case to handle is case | |
858 | * where the tab is just sitting there and doesn't | |
859 | * have enough slack to let the insertion take | |
860 | * place without shifting the rest of the line | |
861 | * over. In this case we have to go out and | |
862 | * delete some characters of the tab before we start | |
863 | * or the answer will be wrong, as the rest of the | |
864 | * line will have been shifted. This code means | |
865 | * that terminals with only insert chracter (no | |
866 | * delete character) won't work correctly. | |
867 | */ | |
868 | i = inssiz - doomed - tabslack - slakused; | |
869 | i %= value(TABSTOP); | |
870 | if (i > 0) { | |
871 | vgotoCL(tabstart); | |
872 | godm(); | |
873 | for (i = inssiz - doomed - tabslack; i > 0; i--) | |
874 | vputp(DC, DEPTH(vcline)); | |
875 | enddm(); | |
876 | } | |
877 | } | |
878 | ||
879 | /* | |
880 | * Now put out the characters of the actual insertion. | |
881 | */ | |
882 | vigotoCL(inscol); | |
883 | remdoom = doomed; | |
884 | for (i = inssiz; i > 0; i--) { | |
885 | if (remdoom > 0) { | |
886 | remdoom--; | |
887 | endim(); | |
888 | } else if (noim) | |
889 | endim(); | |
890 | else if (IM && EI) { | |
891 | vcsync(); | |
892 | goim(); | |
893 | } | |
894 | vputchar(c); | |
895 | } | |
896 | ||
897 | if (!IM || !EI) { | |
898 | /* | |
899 | * We are a dumb terminal; brute force update | |
900 | * the rest of the line; this is very much an n^^2 process, | |
901 | * and totally unreasonable at low speed. | |
902 | * | |
903 | * You asked for it, you get it. | |
904 | */ | |
905 | tp = vtube0 + inscol + doomed; | |
906 | for (i = inscol + doomed; i < tabstart; i++) | |
907 | vputchar(*tp++); | |
908 | hold = oldhold; | |
909 | vigotoCL(tabstart + inssiz - doomed); | |
910 | for (i = tabsize - (inssiz - doomed) + shft; i > 0; i--) | |
911 | vputchar(' ' | QUOTE); | |
912 | } else { | |
913 | if (!IN) { | |
914 | /* | |
915 | * On terminals without multi-line | |
916 | * insert in the hardware, we must go fix the segments | |
917 | * between the inserted text and the following | |
918 | * tabs, if they are on different lines. | |
919 | * | |
920 | * Aaargh. | |
921 | */ | |
922 | tp = vtube0; | |
923 | for (j = (inscol + inssiz - 1) / WCOLS + 1; | |
924 | j <= (tabstart + inssiz - doomed - 1) / WCOLS; j++) { | |
925 | vgotoCL(j * WCOLS); | |
926 | i = inssiz - doomed; | |
927 | up = tp + j * WCOLS - i; | |
928 | goim(); | |
929 | do | |
930 | vputchar(*up++); | |
931 | while (--i && *up); | |
932 | } | |
933 | } else { | |
934 | /* | |
935 | * On terminals with multi line inserts, | |
936 | * life is simpler, just reflect eating of | |
937 | * the slack. | |
938 | */ | |
939 | tp = vtube0 + tabend; | |
940 | for (i = tabsize - (inssiz - doomed); i >= 0; i--) { | |
941 | if ((*--tp & (QUOTE|TRIM)) == QUOTE) { | |
942 | --tabslack; | |
943 | if (tabslack >= slakused) | |
944 | continue; | |
945 | } | |
946 | *tp = ' ' | QUOTE; | |
947 | } | |
948 | } | |
949 | /* | |
950 | * Blank out the shifted positions to be tab positions. | |
951 | */ | |
952 | if (shft) { | |
953 | tp = vtube0 + tabend + shft; | |
954 | for (i = tabsize - (inssiz - doomed) + shft; i > 0; i--) | |
955 | if ((*--tp & QUOTE) == 0) | |
956 | *tp = ' ' | QUOTE; | |
957 | } | |
958 | } | |
959 | ||
960 | /* | |
961 | * Finally, complete the screen image update | |
962 | * to reflect the insertion. | |
963 | */ | |
964 | hold = oldhold; | |
965 | tp = vtube0 + tabstart; up = tp + inssiz - doomed; | |
966 | for (i = tabstart; i > inscol + doomed; i--) | |
967 | *--up = *--tp; | |
968 | for (i = inssiz; i > 0; i--) | |
969 | *--up = c; | |
970 | doomed = 0; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Go into ``delete mode''. If the | |
975 | * sequence which goes into delete mode | |
976 | * is the same as that which goes into insert | |
977 | * mode, then we are in delete mode already. | |
978 | */ | |
979 | godm() | |
980 | { | |
981 | ||
982 | if (insmode) { | |
983 | if (eq(DM, IM)) | |
984 | return; | |
985 | endim(); | |
986 | } | |
987 | vputp(DM, 0); | |
988 | } | |
989 | ||
990 | /* | |
991 | * If we are coming out of delete mode, but | |
992 | * delete and insert mode end with the same sequence, | |
993 | * it wins to pretend we are now in insert mode, | |
994 | * since we will likely want to be there again soon | |
995 | * if we just moved over to delete space from part of | |
996 | * a tab (above). | |
997 | */ | |
998 | enddm() | |
999 | { | |
1000 | ||
1001 | if (eq(DM, IM)) { | |
1002 | insmode = 1; | |
1003 | return; | |
1004 | } | |
1005 | vputp(ED, 0); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * In and out of insert mode. | |
1010 | * Note that the code here demands that there be | |
1011 | * a string for insert mode (the null string) even | |
1012 | * if the terminal does all insertions a single character | |
1013 | * at a time, since it branches based on whether IM is null. | |
1014 | */ | |
1015 | goim() | |
1016 | { | |
1017 | ||
1018 | if (!insmode) | |
1019 | vputp(IM, 0); | |
1020 | insmode = 1; | |
1021 | } | |
1022 | ||
1023 | endim() | |
1024 | { | |
1025 | ||
1026 | if (insmode) { | |
1027 | vputp(EI, 0); | |
1028 | insmode = 0; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Put the character c on the screen at the current cursor position. | |
1034 | * This routine handles wraparound and scrolling and understands not | |
1035 | * to roll when splitw is set, i.e. we are working in the echo area. | |
1036 | * There is a bunch of hacking here dealing with the difference between | |
1037 | * QUOTE, QUOTE|' ', and ' ' for CONCEPT-100 like terminals, and also | |
1038 | * code to deal with terminals which overstrike, including CRT's where | |
1039 | * you can erase overstrikes with some work. CRT's which do underlining | |
1040 | * implicitly which has to be erased (like CONCEPTS) are also handled. | |
1041 | */ | |
1042 | vputchar(c) | |
1043 | register int c; | |
1044 | { | |
1045 | register char *tp; | |
1046 | register int d; | |
1047 | ||
1048 | c &= (QUOTE|TRIM); | |
1049 | #ifdef TRACE | |
1050 | if (trace) | |
1051 | tracec(c); | |
1052 | #endif | |
887e3e0d | 1053 | /* Fix problem of >79 chars on echo line. */ |
98fb7faa | 1054 | if (destcol >= WCOLS-1 && splitw && destline == WECHO) |
887e3e0d | 1055 | pofix(); |
98fb7faa MH |
1056 | if (destcol >= WCOLS) { |
1057 | destline += destcol / WCOLS; | |
1058 | destcol %= WCOLS; | |
1059 | } | |
1060 | if (destline > WBOT && (!splitw || destline > WECHO)) | |
1061 | vrollup(destline); | |
1062 | tp = vtube[destline] + destcol; | |
1063 | switch (c) { | |
1064 | ||
1065 | case '\t': | |
1066 | vgotab(); | |
1067 | return; | |
1068 | ||
1069 | case ' ': | |
1070 | /* | |
1071 | * We can get away without printing a space in a number | |
1072 | * of cases, but not always. We get away with doing nothing | |
1073 | * if we are not in insert mode, and not on a CONCEPT-100 | |
1074 | * like terminal, and either not in hardcopy open or in hardcopy | |
1075 | * open on a terminal with no overstriking, provided, | |
1076 | * in all cases, that nothing has ever been displayed | |
1077 | * at this position. Ugh. | |
1078 | */ | |
1079 | if (!insmode && !IN && (state != HARDOPEN || OS) && (*tp&TRIM) == 0) { | |
1080 | *tp = ' '; | |
1081 | destcol++; | |
1082 | return; | |
1083 | } | |
1084 | goto def; | |
1085 | ||
1086 | case QUOTE: | |
1087 | if (insmode) { | |
1088 | /* | |
1089 | * When in insert mode, tabs have to expand | |
1090 | * to real, printed blanks. | |
1091 | */ | |
1092 | c = ' ' | QUOTE; | |
1093 | goto def; | |
1094 | } | |
1095 | if (*tp == 0) { | |
1096 | /* | |
1097 | * A ``space''. | |
1098 | */ | |
1099 | if ((hold & HOLDPUPD) == 0) | |
1100 | *tp = QUOTE; | |
1101 | destcol++; | |
1102 | return; | |
1103 | } | |
1104 | /* | |
1105 | * A ``space'' ontop of a part of a tab. | |
1106 | */ | |
1107 | if (*tp & QUOTE) { | |
1108 | destcol++; | |
1109 | return; | |
1110 | } | |
1111 | c = ' ' | QUOTE; | |
1112 | /* fall into ... */ | |
1113 | ||
1114 | def: | |
1115 | default: | |
1116 | d = *tp & TRIM; | |
1117 | /* | |
1118 | * Now get away with doing nothing if the characters | |
1119 | * are the same, provided we are not in insert mode | |
1120 | * and if we are in hardopen, that the terminal has overstrike. | |
1121 | */ | |
1122 | if (d == (c & TRIM) && !insmode && (state != HARDOPEN || OS)) { | |
1123 | if ((hold & HOLDPUPD) == 0) | |
1124 | *tp = c; | |
1125 | destcol++; | |
1126 | return; | |
1127 | } | |
1128 | /* | |
1129 | * Backwards looking optimization. | |
1130 | * The low level cursor motion routines will use | |
1131 | * a cursor motion right sequence to step 1 character | |
1132 | * right. On, e.g., a DM3025A this is 2 characters | |
1133 | * and printing is noticeably slower at 300 baud. | |
1134 | * Since the low level routines are not allowed to use | |
1135 | * spaces for positioning, we discover the common | |
1136 | * case of a single space here and force a space | |
1137 | * to be printed. | |
1138 | */ | |
1139 | if (destcol == outcol + 1 && tp[-1] == ' ' && outline == destline) { | |
1140 | vputc(' '); | |
1141 | outcol++; | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * This is an inline expansion a call to vcsync() dictated | |
1146 | * by high frequency in a profile. | |
1147 | */ | |
1148 | if (outcol != destcol || outline != destline) | |
1149 | vgoto(destline, destcol); | |
1150 | ||
1151 | /* | |
1152 | * Deal with terminals which have overstrike. | |
1153 | * We handle erasing general overstrikes, erasing | |
1154 | * underlines on terminals (such as CONCEPTS) which | |
1155 | * do underlining correctly automatically (e.g. on nroff | |
1156 | * output), and remembering, in hardcopy mode, | |
1157 | * that we have overstruct something. | |
1158 | */ | |
1159 | if (!insmode && d && d != ' ' && d != (c & TRIM)) { | |
1160 | if (EO && (OS || UL && (c == '_' || d == '_'))) { | |
1161 | vputc(' '); | |
1162 | outcol++, destcol++; | |
1163 | back1(); | |
1164 | } else | |
1165 | rubble = 1; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Unless we are just bashing characters around for | |
1170 | * inner working of insert mode, update the display. | |
1171 | */ | |
1172 | if ((hold & HOLDPUPD) == 0) | |
1173 | *tp = c; | |
1174 | ||
1175 | /* | |
1176 | * In insert mode, put out the IC sequence, padded | |
1177 | * based on the depth of the current line. | |
1178 | * A terminal which had no real insert mode, rather | |
1179 | * opening a character position at a time could do this. | |
1180 | * Actually should use depth to end of current line | |
1181 | * but this rarely matters. | |
1182 | */ | |
1183 | if (insmode) | |
1184 | vputp(IC, DEPTH(vcline)); | |
1185 | vputc(c & TRIM); | |
1186 | ||
1187 | /* | |
1188 | * In insert mode, IP is a post insert pad. | |
1189 | */ | |
1190 | if (insmode) | |
1191 | vputp(IP, DEPTH(vcline)); | |
1192 | destcol++, outcol++; | |
1193 | ||
1194 | /* | |
1195 | * CONCEPT braindamage in early models: after a wraparound | |
1196 | * the next newline is eaten. It's hungry so we just | |
1197 | * feed it now rather than worrying about it. | |
1198 | */ | |
1199 | if (XN && outcol % WCOLS == 0) | |
1200 | vputc('\n'); | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Delete display positions stcol through endcol. | |
1206 | * Amount of use of special terminal features here is limited. | |
1207 | */ | |
1208 | physdc(stcol, endcol) | |
1209 | int stcol, endcol; | |
1210 | { | |
1211 | register char *tp, *up; | |
1212 | char *tpe; | |
1213 | register int i; | |
1214 | register int nc = endcol - stcol; | |
1215 | ||
1216 | #ifdef IDEBUG | |
1217 | if (trace) | |
1218 | tfixnl(), fprintf(trace, "physdc(%d, %d)\n", stcol, endcol); | |
1219 | #endif | |
1220 | if (!DC || nc <= 0) | |
1221 | return; | |
1222 | if (IN) { | |
1223 | /* | |
1224 | * CONCEPT-100 like terminal. | |
1225 | * If there are any ``spaces'' in the material to be | |
1226 | * deleted, then this is too hard, just retype. | |
1227 | */ | |
1228 | vprepins(); | |
1229 | up = vtube0 + stcol; | |
1230 | i = nc; | |
1231 | do | |
1232 | if ((*up++ & (QUOTE|TRIM)) == QUOTE) | |
1233 | return; | |
1234 | while (--i); | |
1235 | i = 2 * nc; | |
1236 | do | |
1237 | if (*up == 0 || (*up++ & QUOTE) == QUOTE) | |
1238 | return; | |
1239 | while (--i); | |
1240 | vgotoCL(stcol); | |
1241 | } else { | |
1242 | /* | |
1243 | * HP like delete mode. | |
1244 | * Compute how much text we are moving over by deleting. | |
1245 | * If it appears to be faster to just retype | |
1246 | * the line, do nothing and that will be done later. | |
1247 | * We are assuming 2 output characters per deleted | |
1248 | * characters and that clear to end of line is available. | |
1249 | */ | |
1250 | i = stcol / WCOLS; | |
1251 | if (i != endcol / WCOLS) | |
1252 | return; | |
1253 | i += LINE(vcline); | |
1254 | stcol %= WCOLS; | |
1255 | endcol %= WCOLS; | |
1256 | up = vtube[i]; tp = up + endcol; tpe = up + WCOLS; | |
1257 | while (tp < tpe && *tp) | |
1258 | tp++; | |
1259 | if (tp - (up + stcol) < 2 * nc) | |
1260 | return; | |
1261 | vgoto(i, stcol); | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * Go into delete mode and do the actual delete. | |
1266 | * Padding is on DC itself. | |
1267 | */ | |
1268 | godm(); | |
1269 | for (i = nc; i > 0; i--) | |
1270 | vputp(DC, DEPTH(vcline)); | |
1271 | vputp(ED, 0); | |
1272 | ||
1273 | /* | |
1274 | * Straighten up. | |
1275 | * With CONCEPT like terminals, characters are pulled left | |
1276 | * from first following null. HP like terminals shift rest of | |
1277 | * this (single physical) line rigidly. | |
1278 | */ | |
1279 | if (IN) { | |
1280 | up = vtube0 + stcol; | |
1281 | tp = vtube0 + endcol; | |
1282 | while (i = *tp++) { | |
1283 | if ((i & (QUOTE|TRIM)) == QUOTE) | |
1284 | break; | |
1285 | *up++ = i; | |
1286 | } | |
1287 | do | |
1288 | *up++ = i; | |
1289 | while (--nc); | |
1290 | } else { | |
1291 | copy(up + stcol, up + endcol, WCOLS - endcol); | |
1292 | vclrbyte(tpe - nc, nc); | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | #ifdef TRACE | |
1297 | tfixnl() | |
1298 | { | |
1299 | ||
1300 | if (trubble || techoin) | |
1301 | fprintf(trace, "\n"); | |
1302 | trubble = 0, techoin = 0; | |
1303 | } | |
1304 | ||
1305 | tvliny() | |
1306 | { | |
1307 | register int i; | |
1308 | ||
1309 | if (!trace) | |
1310 | return; | |
1311 | tfixnl(); | |
1312 | fprintf(trace, "vcnt = %d, vcline = %d, vliny = ", vcnt, vcline); | |
1313 | for (i = 0; i <= vcnt; i++) { | |
1314 | fprintf(trace, "%d", LINE(i)); | |
1315 | if (FLAGS(i) & VDIRT) | |
1316 | fprintf(trace, "*"); | |
1317 | if (DEPTH(i) != 1) | |
1318 | fprintf(trace, "<%d>", DEPTH(i)); | |
1319 | if (i < vcnt) | |
1320 | fprintf(trace, " "); | |
1321 | } | |
1322 | fprintf(trace, "\n"); | |
1323 | } | |
1324 | ||
1325 | tracec(c) | |
1326 | char c; | |
1327 | { | |
1328 | ||
1329 | if (!techoin) | |
1330 | trubble = 1; | |
1331 | if (c == ESCAPE) | |
1332 | fprintf(trace, "$"); | |
1333 | else if (c < ' ' || c == DELETE) | |
1334 | fprintf(trace, "^%c", ctlof(c)); | |
1335 | else | |
1336 | fprintf(trace, "%c", c); | |
1337 | } | |
1338 | #endif | |
1339 | ||
1340 | /* | |
1341 | * Put a character with possible tracing. | |
1342 | */ | |
1343 | vputch(c) | |
1344 | int c; | |
1345 | { | |
1346 | ||
1347 | #ifdef TRACE | |
1348 | if (trace) | |
1349 | tracec(c); | |
1350 | #endif | |
1351 | vputc(c); | |
1352 | } |