Commit | Line | Data |
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27704fe4 BJ |
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 | */ | |
118 | if (DB) | |
119 | vgoto(WECHO, 0), vputp(CD ? CD : CE, 1); | |
120 | else | |
121 | vigoto(WECHO, 0), vclreol(); | |
122 | splitw = 0; | |
123 | didphys = 1; | |
124 | } | |
125 | if (didphys) | |
126 | vclrbyte(vtube[WECHO], WCOLS); | |
127 | heldech = 0; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Fix the echo area for use, setting | |
132 | * the state variable splitw so we wont rollup | |
133 | * when we move the cursor there. | |
134 | */ | |
135 | fixech() | |
136 | { | |
137 | ||
138 | splitw++; | |
139 | if (state != VISUAL && state != CRTOPEN) { | |
140 | vclean(); | |
141 | vcnt = 0; | |
142 | } | |
143 | vgoto(WECHO, 0); flusho(); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Put the cursor ``before'' cp. | |
148 | */ | |
149 | vcursbef(cp) | |
150 | register char *cp; | |
151 | { | |
152 | ||
153 | if (cp <= linebuf) | |
154 | vgotoCL(value(NUMBER) << 3); | |
155 | else | |
156 | vgotoCL(column(cp - 1) - 1); | |
157 | } | |
158 | ||
159 | /* | |
160 | * Put the cursor ``at'' cp. | |
161 | */ | |
162 | vcursat(cp) | |
163 | register char *cp; | |
164 | { | |
165 | ||
166 | if (cp <= linebuf && linebuf[0] == 0) | |
167 | vgotoCL(value(NUMBER) << 3); | |
168 | else | |
169 | vgotoCL(column(cp - 1)); | |
170 | } | |
171 | ||
172 | /* | |
173 | * Put the cursor ``after'' cp. | |
174 | */ | |
175 | vcursaft(cp) | |
176 | register char *cp; | |
177 | { | |
178 | ||
179 | vgotoCL(column(cp)); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Fix the cursor to be positioned in the correct place | |
184 | * to accept a command. | |
185 | */ | |
186 | vfixcurs() | |
187 | { | |
188 | ||
189 | vsetcurs(cursor); | |
190 | } | |
191 | ||
192 | /* | |
193 | * Compute the column position implied by the cursor at ``nc'', | |
194 | * and move the cursor there. | |
195 | */ | |
196 | vsetcurs(nc) | |
197 | register char *nc; | |
198 | { | |
199 | register int col; | |
200 | ||
201 | col = column(nc); | |
202 | if (linebuf[0]) | |
203 | col--; | |
204 | vgotoCL(col); | |
205 | cursor = nc; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Move the cursor invisibly, i.e. only remember to do it. | |
210 | */ | |
211 | vigoto(y, x) | |
212 | int y, x; | |
213 | { | |
214 | ||
215 | destline = y; | |
216 | destcol = x; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Move the cursor to the position implied by any previous | |
221 | * vigoto (or low level hacking with destcol/destline as in readecho). | |
222 | */ | |
223 | vcsync() | |
224 | { | |
225 | ||
226 | vgoto(destline, destcol); | |
227 | } | |
228 | ||
229 | /* | |
230 | * Goto column x of the current line. | |
231 | */ | |
232 | vgotoCL(x) | |
233 | register int x; | |
234 | { | |
235 | ||
236 | if (splitw) | |
237 | vgoto(WECHO, x); | |
238 | else | |
239 | vgoto(LINE(vcline), x); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Invisible goto column x of current line. | |
244 | */ | |
245 | vigotoCL(x) | |
246 | register int x; | |
247 | { | |
248 | ||
249 | if (splitw) | |
250 | vigoto(WECHO, x); | |
251 | else | |
252 | vigoto(LINE(vcline), x); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Move cursor to line y, column x, handling wraparound and scrolling. | |
257 | */ | |
258 | vgoto(y, x) | |
259 | register int y, x; | |
260 | { | |
261 | register char *tp; | |
262 | register int c; | |
263 | ||
264 | /* | |
265 | * Fold the possibly too large value of x. | |
266 | */ | |
267 | if (x >= WCOLS) { | |
268 | y += x / WCOLS; | |
269 | x %= WCOLS; | |
270 | } | |
271 | if (y < 0) | |
272 | error("Internal error: vgoto"); | |
273 | if (outcol >= WCOLS) { | |
274 | if (AM) { | |
275 | outline += outcol / WCOLS; | |
276 | outcol %= WCOLS; | |
277 | } else | |
278 | outcol = WCOLS - 1; | |
279 | } | |
280 | ||
281 | /* | |
282 | * In a hardcopy or glass crt open, print the stuff | |
283 | * implied by a motion, or backspace. | |
284 | */ | |
285 | if (state == HARDOPEN || state == ONEOPEN) { | |
286 | if (y != outline) | |
287 | error("Line too long for open"); | |
288 | if (x + 1 < outcol - x || (outcol > x && !BS)) | |
289 | destcol = 0, fgoto(); | |
290 | tp = vtube[WBOT] + outcol; | |
291 | while (outcol != x) | |
292 | if (outcol < x) { | |
293 | if (*tp == 0) | |
294 | *tp = ' '; | |
295 | c = *tp++ & TRIM; | |
296 | vputc(c && (!OS || EO) ? c : ' '), outcol++; | |
297 | } else { | |
298 | if (BC) | |
299 | vputp(BC, 0); | |
300 | else | |
301 | vputc('\b'); | |
302 | outcol--; | |
303 | } | |
304 | destcol = outcol = x; | |
305 | destline = outline; | |
306 | return; | |
307 | } | |
308 | ||
309 | /* | |
310 | * If the destination position implies a scroll, do it. | |
311 | */ | |
312 | destline = y; | |
313 | if (destline > WBOT && (!splitw || destline > WECHO)) { | |
314 | endim(); | |
315 | vrollup(destline); | |
316 | } | |
317 | ||
318 | /* | |
319 | * If there really is a motion involved, do it. | |
320 | * The check here is an optimization based on profiling. | |
321 | */ | |
322 | destcol = x; | |
323 | if ((destline - outline) * WCOLS != destcol - outcol) { | |
324 | if (!MI) | |
325 | endim(); | |
326 | fgoto(); | |
327 | } | |
328 | } | |
329 | ||
330 | /* | |
331 | * This is the hardest code in the editor, and deals with insert modes | |
332 | * on different kinds of intelligent terminals. The complexity is due | |
333 | * to the cross product of three factors: | |
334 | * | |
335 | * 1. Lines may display as more than one segment on the screen. | |
336 | * 2. There are 2 kinds of intelligent terminal insert modes. | |
337 | * 3. Tabs squash when you insert characters in front of them, | |
338 | * in a way in which current intelligent terminals don't handle. | |
339 | * | |
340 | * The two kinds of terminals are typified by the DM2500 or HP2645 for | |
341 | * one and the CONCEPT-100 or the FOX for the other. | |
342 | * | |
343 | * The first (HP2645) kind has an insert mode where the characters | |
344 | * fall off the end of the line and the screen is shifted rigidly | |
345 | * no matter how the display came about. | |
346 | * | |
347 | * The second (CONCEPT-100) kind comes from terminals which are designed | |
348 | * for forms editing and which distinguish between blanks and ``spaces'' | |
349 | * on the screen, spaces being like blank, but never having had | |
350 | * and data typed into that screen position (since, e.g. a clear operation | |
351 | * like clear screen). On these terminals, when you insert a character, | |
352 | * the characters from where you are to the end of the screen shift | |
353 | * over till a ``space'' is found, and the null character there gets | |
354 | * eaten up. | |
355 | * | |
356 | * | |
357 | * The code here considers the line as consisting of several parts | |
358 | * the first part is the ``doomed'' part, i.e. a part of the line | |
359 | * which is being typed over. Next comes some text up to the first | |
360 | * following tab. The tab is the next segment of the line, and finally | |
361 | * text after the tab. | |
362 | * | |
363 | * We have to consider each of these segments and the effect of the | |
364 | * insertion of a character on them. On terminals like HP2645's we | |
365 | * must simulate a multi-line insert mode using the primitive one | |
366 | * line insert mode. If we are inserting in front of a tab, we have | |
367 | * to either delete characters from the tab or insert white space | |
368 | * (when the tab reaches a new spot where it gets larger) before we | |
369 | * insert the new character. | |
370 | * | |
371 | * On a terminal like a CONCEPT our strategy is to make all | |
372 | * blanks be displayed, while trying to keep the screen having ``spaces'' | |
373 | * for portions of tabs. In this way the terminal hardward does some | |
374 | * of the hacking for compression of tabs, although this tends to | |
375 | * disappear as you work on the line and spaces change into blanks. | |
376 | * | |
377 | * There are a number of boundary conditions (like typing just before | |
378 | * the first following tab) where we can avoid a lot of work. Most | |
379 | * of them have to be dealt with explicitly because performance is | |
380 | * much, much worse if we don't. | |
381 | * | |
382 | * A final thing which is hacked here is two flavors of insert mode. | |
383 | * Datamedia's do this by an insert mode which you enter and leave | |
384 | * and by having normal motion character operate differently in this | |
385 | * mode, notably by having a newline insert a line on the screen in | |
386 | * this mode. This generally means it is unsafe to move around | |
387 | * the screen ignoring the fact that we are in this mode. | |
388 | * This is possible on some terminals, and wins big (e.g. HP), so | |
389 | * we encode this as a ``can move in insert capability'' mi, | |
390 | * and terminals which have it can do insert mode with much less | |
391 | * work when tabs are present following the cursor on the current line. | |
392 | */ | |
393 | ||
394 | /* | |
395 | * Routine to expand a tab, calling the normal Outchar routine | |
396 | * to put out each implied character. Note that we call outchar | |
397 | * with a QUOTE. We use QUOTE internally to represent a position | |
398 | * which is part of the expansion of a tab. | |
399 | */ | |
400 | vgotab() | |
401 | { | |
402 | register int i = (LINE(vcline) - destline) * WCOLS + destcol; | |
403 | ||
404 | do | |
405 | (*Outchar)(QUOTE); | |
406 | while (++i % value(TABSTOP)); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Variables for insert mode. | |
411 | */ | |
412 | int linend; /* The column position of end of line */ | |
413 | int tabstart; /* Column of start of first following tab */ | |
414 | int tabend; /* Column of end of following tabs */ | |
415 | int tabsize; /* Size of the following tabs */ | |
416 | int tabslack; /* Number of ``spaces'' in following tabs */ | |
417 | int inssiz; /* Number of characters to be inserted */ | |
418 | int inscol; /* Column where insertion is taking place */ | |
419 | int shft; /* Amount tab expansion shifted rest of line */ | |
420 | int slakused; /* This much of tabslack will be used up */ | |
421 | ||
422 | /* | |
423 | * This routine MUST be called before insert mode is run, | |
424 | * and brings all segments of the current line to the top | |
425 | * of the screen image buffer so it is easier for us to | |
426 | * maniuplate them. | |
427 | */ | |
428 | vprepins() | |
429 | { | |
430 | register int i; | |
431 | register char *cp = vtube0; | |
432 | ||
433 | for (i = 0; i < DEPTH(vcline); i++) { | |
434 | vmaktop(LINE(vcline) + i, cp); | |
435 | cp += WCOLS; | |
436 | } | |
437 | } | |
438 | ||
439 | vmaktop(p, cp) | |
440 | register int p; | |
441 | char *cp; | |
442 | { | |
443 | register int i; | |
444 | char temp[TUBECOLS]; | |
445 | ||
446 | if (vtube[p] == cp) | |
447 | return; | |
448 | for (i = ZERO; i <= WECHO; i++) | |
449 | if (vtube[i] == cp) { | |
450 | copy(temp, vtube[i], WCOLS); | |
451 | copy(vtube[i], vtube[p], WCOLS); | |
452 | copy(vtube[p], temp, WCOLS); | |
453 | vtube[i] = vtube[p]; | |
454 | vtube[p] = cp; | |
455 | return; | |
456 | } | |
457 | error("Line too long"); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Insert character c at current cursor position. | |
462 | * Multi-character inserts occur only as a result | |
463 | * of expansion of tabs (i.e. inssize == 1 except | |
464 | * for tabs) and code assumes this in several place | |
465 | * to make life simpler. | |
466 | */ | |
467 | vinschar(c) | |
468 | char c; | |
469 | { | |
470 | register int i; | |
471 | register char *tp; | |
472 | ||
473 | if ((!IM || !EI) && ((hold & HOLDQIK) || !value(REDRAW) || value(SLOWOPEN))) { | |
474 | /* | |
475 | * Don't want to try to use terminal | |
476 | * insert mode, or to try to fake it. | |
477 | * Just put the character out; the screen | |
478 | * will probably be wrong but we will fix it later. | |
479 | */ | |
480 | if (c == '\t') { | |
481 | vgotab(); | |
482 | return; | |
483 | } | |
484 | vputchar(c); | |
485 | if (DEPTH(vcline) * WCOLS + !value(REDRAW) > | |
486 | (destline - LINE(vcline)) * WCOLS + destcol) | |
487 | return; | |
488 | /* | |
489 | * The next line is about to be clobbered | |
490 | * make space for another segment of this line | |
491 | * (on an intelligent terminal) or just remember | |
492 | * that next line was clobbered (on a dumb one | |
493 | * if we don't care to redraw the tail. | |
494 | */ | |
495 | if (AL) { | |
496 | vnpins(0); | |
497 | } else { | |
498 | c = LINE(vcline) + DEPTH(vcline); | |
499 | if (c < LINE(vcline + 1) || c > WBOT) | |
500 | return; | |
501 | i = destcol; | |
502 | vinslin(c, 1, vcline); | |
503 | DEPTH(vcline)++; | |
504 | vigoto(c, i); | |
505 | vprepins(); | |
506 | } | |
507 | return; | |
508 | } | |
509 | /* | |
510 | * Compute the number of positions in the line image of the | |
511 | * current line. This is done from the physical image | |
512 | * since that is faster. Note that we have no memory | |
513 | * from insertion to insertion so that routines which use | |
514 | * us don't have to worry about moving the cursor around. | |
515 | */ | |
516 | if (*vtube0 == 0) | |
517 | linend = 0; | |
518 | else { | |
519 | /* | |
520 | * Search backwards for a non-null character | |
521 | * from the end of the displayed line. | |
522 | */ | |
523 | i = WCOLS * DEPTH(vcline); | |
524 | if (i == 0) | |
525 | i = WCOLS; | |
526 | tp = vtube0 + i; | |
527 | while (*--tp == 0) | |
528 | if (--i == 0) | |
529 | break; | |
530 | linend = i; | |
531 | } | |
532 | ||
533 | /* | |
534 | * We insert at a position based on the physical location | |
535 | * of the output cursor. | |
536 | */ | |
537 | inscol = destcol + (destline - LINE(vcline)) * WCOLS; | |
538 | if (c == '\t') { | |
539 | /* | |
540 | * Characters inserted from a tab must be | |
541 | * remembered as being part of a tab, but we can't | |
542 | * use QUOTE here since we really need to print blanks. | |
543 | * QUOTE|' ' is the representation of this. | |
544 | */ | |
545 | inssiz = value(TABSTOP) - inscol % value(TABSTOP); | |
546 | c = ' ' | QUOTE; | |
547 | } else | |
548 | inssiz = 1; | |
549 | ||
550 | /* | |
551 | * If the text to be inserted is less than the number | |
552 | * of doomed positions, then we don't need insert mode, | |
553 | * rather we can just typeover. | |
554 | */ | |
555 | if (inssiz <= doomed) { | |
556 | endim(); | |
557 | if (inscol != linend) | |
558 | doomed -= inssiz; | |
559 | do | |
560 | vputchar(c); | |
561 | while (--inssiz); | |
562 | return; | |
563 | } | |
564 | ||
565 | /* | |
566 | * Have to really do some insertion, thus | |
567 | * stake out the bounds of the first following | |
568 | * group of tabs, computing starting position, | |
569 | * ending position, and the number of ``spaces'' therein | |
570 | * so we can tell how much it will squish. | |
571 | */ | |
572 | tp = vtube0 + inscol; | |
573 | for (i = inscol; i < linend; i++) | |
574 | if (*tp++ & QUOTE) { | |
575 | --tp; | |
576 | break; | |
577 | } | |
578 | tabstart = tabend = i; | |
579 | tabslack = 0; | |
580 | while (tabend < linend) { | |
581 | i = *tp++; | |
582 | if ((i & QUOTE) == 0) | |
583 | break; | |
584 | if ((i & TRIM) == 0) | |
585 | tabslack++; | |
586 | tabsize++; | |
587 | tabend++; | |
588 | } | |
589 | tabsize = tabend - tabstart; | |
590 | ||
591 | /* | |
592 | * For HP's and DM's, e.g. tabslack has no meaning. | |
593 | */ | |
594 | if (!IN) | |
595 | tabslack = 0; | |
596 | #ifdef IDEBUG | |
597 | if (trace) { | |
598 | fprintf(trace, "inscol %d, inssiz %d, tabstart %d, ", | |
599 | inscol, inssiz, tabstart); | |
600 | fprintf(trace, "tabend %d, tabslack %d, linend %d\n", | |
601 | tabend, tabslack, linend); | |
602 | } | |
603 | #endif | |
604 | ||
605 | /* | |
606 | * The real work begins. | |
607 | */ | |
608 | slakused = 0; | |
609 | shft = 0; | |
610 | if (tabsize) { | |
611 | /* | |
612 | * There are tabs on this line. | |
613 | * If they need to expand, then the rest of the line | |
614 | * will have to be shifted over. In this case, | |
615 | * we will need to make sure there are no ``spaces'' | |
616 | * in the rest of the line (on e.g. CONCEPT-100) | |
617 | * and then grab another segment on the screen if this | |
618 | * line is now deeper. We then do the shift | |
619 | * implied by the insertion. | |
620 | */ | |
621 | if (inssiz >= doomed + value(TABSTOP) - tabstart % value(TABSTOP)) { | |
622 | if (IN) | |
623 | vrigid(); | |
624 | vneedpos(value(TABSTOP)); | |
625 | vishft(); | |
626 | } | |
627 | } else if (inssiz > doomed) | |
628 | /* | |
629 | * No tabs, but line may still get deeper. | |
630 | */ | |
631 | vneedpos(inssiz - doomed); | |
632 | /* | |
633 | * Now put in the inserted characters. | |
634 | */ | |
635 | viin(c); | |
636 | ||
637 | /* | |
638 | * Now put the cursor in its final resting place. | |
639 | */ | |
640 | destline = LINE(vcline); | |
641 | destcol = inscol + inssiz; | |
642 | vcsync(); | |
643 | } | |
644 | ||
645 | /* | |
646 | * Rigidify the rest of the line after the first | |
647 | * group of following tabs, typing blanks over ``spaces''. | |
648 | */ | |
649 | vrigid() | |
650 | { | |
651 | register int col; | |
652 | register char *tp = vtube0 + tabend; | |
653 | ||
654 | for (col = tabend; col < linend; col++) | |
655 | if ((*tp++ & TRIM) == 0) { | |
656 | endim(); | |
657 | vgotoCL(col); | |
658 | vputchar(' ' | QUOTE); | |
659 | } | |
660 | } | |
661 | ||
662 | /* | |
663 | * We need cnt more positions on this line. | |
664 | * Open up new space on the screen (this may in fact be a | |
665 | * screen rollup). | |
666 | * | |
667 | * On a dumb terminal we may infact redisplay the rest of the | |
668 | * screen here brute force to keep it pretty. | |
669 | */ | |
670 | vneedpos(cnt) | |
671 | int cnt; | |
672 | { | |
673 | register int d = DEPTH(vcline); | |
674 | register int rmdr = d * WCOLS - linend; | |
675 | ||
676 | if (cnt <= rmdr - IN) | |
677 | return; | |
678 | endim(); | |
679 | vnpins(1); | |
680 | } | |
681 | ||
682 | vnpins(dosync) | |
683 | int dosync; | |
684 | { | |
685 | register int d = DEPTH(vcline); | |
686 | register int e; | |
687 | ||
688 | e = LINE(vcline) + DEPTH(vcline); | |
689 | if (e < LINE(vcline + 1)) { | |
690 | vigoto(e, 0); | |
691 | vclreol(); | |
692 | return; | |
693 | } | |
694 | DEPTH(vcline)++; | |
695 | if (e < WECHO) { | |
696 | e = vglitchup(vcline, d); | |
697 | vigoto(e, 0); vclreol(); | |
698 | if (dosync) { | |
699 | Outchar = vputchar; | |
700 | vsync(e + 1); | |
701 | Outchar = vinschar; | |
702 | } | |
703 | } else { | |
704 | vup1(); | |
705 | vigoto(WBOT, 0); | |
706 | vclreol(); | |
707 | } | |
708 | vprepins(); | |
709 | } | |
710 | ||
711 | /* | |
712 | * Do the shift of the next tabstop implied by | |
713 | * insertion so it expands. | |
714 | */ | |
715 | vishft() | |
716 | { | |
717 | int tshft = 0; | |
718 | int j; | |
719 | register int i; | |
720 | register char *tp = vtube0; | |
721 | register char *up; | |
722 | short oldhold = hold; | |
723 | ||
724 | shft = value(TABSTOP); | |
725 | hold |= HOLDPUPD; | |
726 | if (!IM && !EI) { | |
727 | /* | |
728 | * Dumb terminals are easy, we just have | |
729 | * to retype the text. | |
730 | */ | |
731 | vigotoCL(tabend + shft); | |
732 | up = tp + tabend; | |
733 | for (i = tabend; i < linend; i++) | |
734 | vputchar(*up++); | |
735 | } else if (IN) { | |
736 | /* | |
737 | * CONCEPT-like terminals do most of the work for us, | |
738 | * we don't have to muck with simulation of multi-line | |
739 | * insert mode. Some of the shifting may come for free | |
740 | * also if the tabs don't have enough slack to take up | |
741 | * all the inserted characters. | |
742 | */ | |
743 | i = shft; | |
744 | slakused = inssiz - doomed; | |
745 | if (slakused > tabslack) { | |
746 | i -= slakused - tabslack; | |
747 | slakused -= tabslack; | |
748 | } | |
749 | if (i > 0 && tabend != linend) { | |
750 | tshft = i; | |
751 | vgotoCL(tabend); | |
752 | goim(); | |
753 | do | |
754 | vputchar(' ' | QUOTE); | |
755 | while (--i); | |
756 | } | |
757 | } else { | |
758 | /* | |
759 | * HP and Datamedia type terminals have to have multi-line | |
760 | * insert faked. Hack each segment after where we are | |
761 | * (going backwards to where we are.) We then can | |
762 | * hack the segment where the end of the first following | |
763 | * tab group is. | |
764 | */ | |
765 | for (j = DEPTH(vcline) - 1; j > (tabend + shft) / WCOLS; j--) { | |
766 | vgotoCL(j * WCOLS); | |
767 | goim(); | |
768 | up = tp + j * WCOLS - shft; | |
769 | i = shft; | |
770 | do | |
771 | vputchar(*up++); | |
772 | while (--i); | |
773 | } | |
774 | vigotoCL(tabstart); | |
775 | i = shft - (inssiz - doomed); | |
776 | if (i > 0) { | |
777 | tabslack = inssiz - doomed; | |
778 | vcsync(); | |
779 | goim(); | |
780 | do | |
781 | vputchar(' '); | |
782 | while (--i); | |
783 | } | |
784 | } | |
785 | /* | |
786 | * Now do the data moving in the internal screen | |
787 | * image which is common to all three cases. | |
788 | */ | |
789 | tp += linend; | |
790 | up = tp + shft; | |
791 | i = linend - tabend; | |
792 | if (i > 0) | |
793 | do | |
794 | *--up = *--tp; | |
795 | while (--i); | |
796 | if (IN && tshft) { | |
797 | i = tshft; | |
798 | do | |
799 | *--up = ' ' | QUOTE; | |
800 | while (--i); | |
801 | } | |
802 | hold = oldhold; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Now do the insert of the characters (finally). | |
807 | */ | |
808 | viin(c) | |
809 | char c; | |
810 | { | |
811 | register char *tp, *up; | |
812 | register int i, j; | |
813 | register bool noim = 0; | |
814 | int remdoom; | |
815 | short oldhold = hold; | |
816 | ||
817 | hold |= HOLDPUPD; | |
818 | if (tabsize && (IM && EI) && inssiz - doomed > tabslack) | |
819 | /* | |
820 | * There is a tab out there which will be affected | |
821 | * by the insertion since there aren't enough doomed | |
822 | * characters to take up all the insertion and we do | |
823 | * have insert mode capability. | |
824 | */ | |
825 | if (inscol + doomed == tabstart) { | |
826 | /* | |
827 | * The end of the doomed characters sits right at the | |
828 | * start of the tabs, then we don't need to use insert | |
829 | * mode; unless the tab has already been expanded | |
830 | * in which case we MUST use insert mode. | |
831 | */ | |
832 | slakused = 0; | |
833 | noim = !shft; | |
834 | } else { | |
835 | /* | |
836 | * The last really special case to handle is case | |
837 | * where the tab is just sitting there and doesn't | |
838 | * have enough slack to let the insertion take | |
839 | * place without shifting the rest of the line | |
840 | * over. In this case we have to go out and | |
841 | * delete some characters of the tab before we start | |
842 | * or the answer will be wrong, as the rest of the | |
843 | * line will have been shifted. This code means | |
844 | * that terminals with only insert chracter (no | |
845 | * delete character) won't work correctly. | |
846 | */ | |
847 | i = inssiz - doomed - tabslack - slakused; | |
848 | i %= value(TABSTOP); | |
849 | if (i > 0) { | |
850 | vgotoCL(tabstart); | |
851 | godm(); | |
852 | for (i = inssiz - doomed - tabslack; i > 0; i--) | |
853 | vputp(DC, DEPTH(vcline)); | |
854 | enddm(); | |
855 | } | |
856 | } | |
857 | ||
858 | /* | |
859 | * Now put out the characters of the actual insertion. | |
860 | */ | |
861 | vigotoCL(inscol); | |
862 | remdoom = doomed; | |
863 | for (i = inssiz; i > 0; i--) { | |
864 | if (remdoom > 0) { | |
865 | remdoom--; | |
866 | endim(); | |
867 | } else if (noim) | |
868 | endim(); | |
869 | else if (IM && EI) { | |
870 | vcsync(); | |
871 | goim(); | |
872 | } | |
873 | vputchar(c); | |
874 | } | |
875 | ||
876 | if (!IM || !EI) { | |
877 | /* | |
878 | * We are a dumb terminal; brute force update | |
879 | * the rest of the line; this is very much an n^^2 process, | |
880 | * and totally unreasonable at low speed. | |
881 | * | |
882 | * You asked for it, you get it. | |
883 | */ | |
884 | tp = vtube0 + inscol + doomed; | |
885 | for (i = inscol + doomed; i < tabstart; i++) | |
886 | vputchar(*tp++); | |
887 | hold = oldhold; | |
888 | vigotoCL(tabstart + inssiz - doomed); | |
889 | for (i = tabsize - (inssiz - doomed) + shft; i > 0; i--) | |
890 | vputchar(' ' | QUOTE); | |
891 | } else { | |
892 | if (!IN) { | |
893 | /* | |
894 | * On terminals without multi-line | |
895 | * insert in the hardware, we must go fix the segments | |
896 | * between the inserted text and the following | |
897 | * tabs, if they are on different lines. | |
898 | * | |
899 | * Aaargh. | |
900 | */ | |
901 | tp = vtube0; | |
902 | for (j = (inscol + inssiz - 1) / WCOLS + 1; | |
903 | j <= (tabstart + inssiz - doomed - 1) / WCOLS; j++) { | |
904 | vgotoCL(j * WCOLS); | |
905 | i = inssiz - doomed; | |
906 | up = tp + j * WCOLS - i; | |
907 | goim(); | |
908 | do | |
909 | vputchar(*up++); | |
910 | while (--i && *up); | |
911 | } | |
912 | } else { | |
913 | /* | |
914 | * On terminals with multi line inserts, | |
915 | * life is simpler, just reflect eating of | |
916 | * the slack. | |
917 | */ | |
918 | tp = vtube0 + tabend; | |
919 | for (i = tabsize - (inssiz - doomed); i >= 0; i--) { | |
920 | if ((*--tp & (QUOTE|TRIM)) == QUOTE) { | |
921 | --tabslack; | |
922 | if (tabslack >= slakused) | |
923 | continue; | |
924 | } | |
925 | *tp = ' ' | QUOTE; | |
926 | } | |
927 | } | |
928 | /* | |
929 | * Blank out the shifted positions to be tab positions. | |
930 | */ | |
931 | if (shft) { | |
932 | tp = vtube0 + tabend + shft; | |
933 | for (i = tabsize - (inssiz - doomed) + shft; i > 0; i--) | |
934 | if ((*--tp & QUOTE) == 0) | |
935 | *tp = ' ' | QUOTE; | |
936 | } | |
937 | } | |
938 | ||
939 | /* | |
940 | * Finally, complete the screen image update | |
941 | * to reflect the insertion. | |
942 | */ | |
943 | hold = oldhold; | |
944 | tp = vtube0 + tabstart; up = tp + inssiz - doomed; | |
945 | for (i = tabstart; i > inscol + doomed; i--) | |
946 | *--up = *--tp; | |
947 | for (i = inssiz; i > 0; i--) | |
948 | *--up = c; | |
949 | doomed = 0; | |
950 | } | |
951 | ||
952 | /* | |
953 | * Go into ``delete mode''. If the | |
954 | * sequence which goes into delete mode | |
955 | * is the same as that which goes into insert | |
956 | * mode, then we are in delete mode already. | |
957 | */ | |
958 | godm() | |
959 | { | |
960 | ||
961 | if (insmode) { | |
962 | if (eq(DM, IM)) | |
963 | return; | |
964 | endim(); | |
965 | } | |
966 | vputp(DM, 0); | |
967 | } | |
968 | ||
969 | /* | |
970 | * If we are coming out of delete mode, but | |
971 | * delete and insert mode end with the same sequence, | |
972 | * it wins to pretend we are now in insert mode, | |
973 | * since we will likely want to be there again soon | |
974 | * if we just moved over to delete space from part of | |
975 | * a tab (above). | |
976 | */ | |
977 | enddm() | |
978 | { | |
979 | ||
980 | if (eq(DM, IM)) { | |
981 | insmode = 1; | |
982 | return; | |
983 | } | |
984 | vputp(ED, 0); | |
985 | } | |
986 | ||
987 | /* | |
988 | * In and out of insert mode. | |
989 | * Note that the code here demands that there be | |
990 | * a string for insert mode (the null string) even | |
991 | * if the terminal does all insertions a single character | |
992 | * at a time, since it branches based on whether IM is null. | |
993 | */ | |
994 | goim() | |
995 | { | |
996 | ||
997 | if (!insmode) | |
998 | vputp(IM, 0); | |
999 | insmode = 1; | |
1000 | } | |
1001 | ||
1002 | endim() | |
1003 | { | |
1004 | ||
1005 | if (insmode) { | |
1006 | vputp(EI, 0); | |
1007 | insmode = 0; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * Put the character c on the screen at the current cursor position. | |
1013 | * This routine handles wraparound and scrolling and understands not | |
1014 | * to roll when splitw is set, i.e. we are working in the echo area. | |
1015 | * There is a bunch of hacking here dealing with the difference between | |
1016 | * QUOTE, QUOTE|' ', and ' ' for CONCEPT-100 like terminals, and also | |
1017 | * code to deal with terminals which overstrike, including CRT's where | |
1018 | * you can erase overstrikes with some work. CRT's which do underlining | |
1019 | * implicitly which has to be erased (like CONCEPTS) are also handled. | |
1020 | */ | |
1021 | vputchar(c) | |
1022 | register int c; | |
1023 | { | |
1024 | register char *tp; | |
1025 | register int d; | |
1026 | ||
1027 | c &= (QUOTE|TRIM); | |
1028 | #ifdef TRACE | |
1029 | if (trace) | |
1030 | tracec(c); | |
1031 | #endif | |
1032 | /* Patch to fix problem of >79 chars on echo line: don't echo extras */ | |
1033 | if (destcol >= WCOLS-1 && splitw && destline == WECHO) | |
1034 | return; | |
1035 | if (destcol >= WCOLS) { | |
1036 | destline += destcol / WCOLS; | |
1037 | destcol %= WCOLS; | |
1038 | } | |
1039 | if (destline > WBOT && (!splitw || destline > WECHO)) | |
1040 | vrollup(destline); | |
1041 | tp = vtube[destline] + destcol; | |
1042 | switch (c) { | |
1043 | ||
1044 | case '\t': | |
1045 | vgotab(); | |
1046 | return; | |
1047 | ||
1048 | case ' ': | |
1049 | /* | |
1050 | * We can get away without printing a space in a number | |
1051 | * of cases, but not always. We get away with doing nothing | |
1052 | * if we are not in insert mode, and not on a CONCEPT-100 | |
1053 | * like terminal, and either not in hardcopy open or in hardcopy | |
1054 | * open on a terminal with no overstriking, provided, | |
1055 | * in all cases, that nothing has ever been displayed | |
1056 | * at this position. Ugh. | |
1057 | */ | |
1058 | if (!insmode && !IN && (state != HARDOPEN || OS) && (*tp&TRIM) == 0) { | |
1059 | *tp = ' '; | |
1060 | destcol++; | |
1061 | return; | |
1062 | } | |
1063 | goto def; | |
1064 | ||
1065 | case QUOTE: | |
1066 | if (insmode) { | |
1067 | /* | |
1068 | * When in insert mode, tabs have to expand | |
1069 | * to real, printed blanks. | |
1070 | */ | |
1071 | c = ' ' | QUOTE; | |
1072 | goto def; | |
1073 | } | |
1074 | if (*tp == 0) { | |
1075 | /* | |
1076 | * A ``space''. | |
1077 | */ | |
1078 | if ((hold & HOLDPUPD) == 0) | |
1079 | *tp = QUOTE; | |
1080 | destcol++; | |
1081 | return; | |
1082 | } | |
1083 | /* | |
1084 | * A ``space'' ontop of a part of a tab. | |
1085 | */ | |
1086 | if (*tp & QUOTE) { | |
1087 | destcol++; | |
1088 | return; | |
1089 | } | |
1090 | c = ' ' | QUOTE; | |
1091 | /* fall into ... */ | |
1092 | ||
1093 | def: | |
1094 | default: | |
1095 | d = *tp & TRIM; | |
1096 | /* | |
1097 | * Now get away with doing nothing if the characters | |
1098 | * are the same, provided we are not in insert mode | |
1099 | * and if we are in hardopen, that the terminal has overstrike. | |
1100 | */ | |
1101 | if (d == (c & TRIM) && !insmode && (state != HARDOPEN || OS)) { | |
1102 | if ((hold & HOLDPUPD) == 0) | |
1103 | *tp = c; | |
1104 | destcol++; | |
1105 | return; | |
1106 | } | |
1107 | /* | |
1108 | * Backwards looking optimization. | |
1109 | * The low level cursor motion routines will use | |
1110 | * a cursor motion right sequence to step 1 character | |
1111 | * right. On, e.g., a DM3025A this is 2 characters | |
1112 | * and printing is noticeably slower at 300 baud. | |
1113 | * Since the low level routines are not allowed to use | |
1114 | * spaces for positioning, we discover the common | |
1115 | * case of a single space here and force a space | |
1116 | * to be printed. | |
1117 | */ | |
1118 | if (destcol == outcol + 1 && tp[-1] == ' ' && outline == destline) { | |
1119 | vputc(' '); | |
1120 | outcol++; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * This is an inline expansion a call to vcsync() dictated | |
1125 | * by high frequency in a profile. | |
1126 | */ | |
1127 | if (outcol != destcol || outline != destline) | |
1128 | vgoto(destline, destcol); | |
1129 | ||
1130 | /* | |
1131 | * Deal with terminals which have overstrike. | |
1132 | * We handle erasing general overstrikes, erasing | |
1133 | * underlines on terminals (such as CONCEPTS) which | |
1134 | * do underlining correctly automatically (e.g. on nroff | |
1135 | * output), and remembering, in hardcopy mode, | |
1136 | * that we have overstruct something. | |
1137 | */ | |
1138 | if (!insmode && d && d != ' ' && d != (c & TRIM)) { | |
1139 | if (EO && (OS || UL && (c == '_' || d == '_'))) { | |
1140 | vputc(' '); | |
1141 | outcol++, destcol++; | |
1142 | back1(); | |
1143 | } else | |
1144 | rubble = 1; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Unless we are just bashing characters around for | |
1149 | * inner working of insert mode, update the display. | |
1150 | */ | |
1151 | if ((hold & HOLDPUPD) == 0) | |
1152 | *tp = c; | |
1153 | ||
1154 | /* | |
1155 | * In insert mode, put out the IC sequence, padded | |
1156 | * based on the depth of the current line. | |
1157 | * A terminal which had no real insert mode, rather | |
1158 | * opening a character position at a time could do this. | |
1159 | * Actually should use depth to end of current line | |
1160 | * but this rarely matters. | |
1161 | */ | |
1162 | if (insmode) | |
1163 | vputp(IC, DEPTH(vcline)); | |
1164 | vputc(c & TRIM); | |
1165 | ||
1166 | /* | |
1167 | * In insert mode, IP is a post insert pad. | |
1168 | */ | |
1169 | if (insmode) | |
1170 | vputp(IP, DEPTH(vcline)); | |
1171 | destcol++, outcol++; | |
1172 | ||
1173 | /* | |
1174 | * CONCEPT braindamage in early models: after a wraparound | |
1175 | * the next newline is eaten. It's hungry so we just | |
1176 | * feed it now rather than worrying about it. | |
1177 | */ | |
1178 | if (XN && outcol % WCOLS == 0) | |
1179 | vputc('\n'); | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Delete display positions stcol through endcol. | |
1185 | * Amount of use of special terminal features here is limited. | |
1186 | */ | |
1187 | physdc(stcol, endcol) | |
1188 | int stcol, endcol; | |
1189 | { | |
1190 | register char *tp, *up; | |
1191 | char *tpe; | |
1192 | register int i; | |
1193 | register int nc = endcol - stcol; | |
1194 | ||
1195 | #ifdef IDEBUG | |
1196 | if (trace) | |
1197 | tfixnl(), fprintf(trace, "physdc(%d, %d)\n", stcol, endcol); | |
1198 | #endif | |
1199 | if (!DC || nc <= 0) | |
1200 | return; | |
1201 | if (IN) { | |
1202 | /* | |
1203 | * CONCEPT-100 like terminal. | |
1204 | * If there are any ``spaces'' in the material to be | |
1205 | * deleted, then this is too hard, just retype. | |
1206 | */ | |
1207 | vprepins(); | |
1208 | up = vtube0 + stcol; | |
1209 | i = nc; | |
1210 | do | |
1211 | if ((*up++ & (QUOTE|TRIM)) == QUOTE) | |
1212 | return; | |
1213 | while (--i); | |
1214 | i = 2 * nc; | |
1215 | do | |
1216 | if (*up == 0 || (*up++ & QUOTE) == QUOTE) | |
1217 | return; | |
1218 | while (--i); | |
1219 | vgotoCL(stcol); | |
1220 | } else { | |
1221 | /* | |
1222 | * HP like delete mode. | |
1223 | * Compute how much text we are moving over by deleting. | |
1224 | * If it appears to be faster to just retype | |
1225 | * the line, do nothing and that will be done later. | |
1226 | * We are assuming 2 output characters per deleted | |
1227 | * characters and that clear to end of line is available. | |
1228 | */ | |
1229 | i = stcol / WCOLS; | |
1230 | if (i != endcol / WCOLS) | |
1231 | return; | |
1232 | i += LINE(vcline); | |
1233 | stcol %= WCOLS; | |
1234 | endcol %= WCOLS; | |
1235 | up = vtube[i]; tp = up + endcol; tpe = up + WCOLS; | |
1236 | while (tp < tpe && *tp) | |
1237 | tp++; | |
1238 | if (tp - (up + stcol) < 2 * nc) | |
1239 | return; | |
1240 | vgoto(i, stcol); | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Go into delete mode and do the actual delete. | |
1245 | * Padding is on DC itself. | |
1246 | */ | |
1247 | godm(); | |
1248 | for (i = nc; i > 0; i--) | |
1249 | vputp(DC, DEPTH(vcline)); | |
1250 | vputp(ED, 0); | |
1251 | ||
1252 | /* | |
1253 | * Straighten up. | |
1254 | * With CONCEPT like terminals, characters are pulled left | |
1255 | * from first following null. HP like terminals shift rest of | |
1256 | * this (single physical) line rigidly. | |
1257 | */ | |
1258 | if (IN) { | |
1259 | up = vtube0 + stcol; | |
1260 | tp = vtube0 + endcol; | |
1261 | while (i = *tp++) { | |
1262 | if ((i & (QUOTE|TRIM)) == QUOTE) | |
1263 | break; | |
1264 | *up++ = i; | |
1265 | } | |
1266 | do | |
1267 | *up++ = i; | |
1268 | while (--nc); | |
1269 | } else { | |
1270 | copy(up + stcol, up + endcol, WCOLS - endcol); | |
1271 | vclrbyte(tpe - nc, nc); | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | #ifdef TRACE | |
1276 | tfixnl() | |
1277 | { | |
1278 | ||
1279 | if (trubble || techoin) | |
1280 | fprintf(trace, "\n"); | |
1281 | trubble = 0, techoin = 0; | |
1282 | } | |
1283 | ||
1284 | tvliny() | |
1285 | { | |
1286 | register int i; | |
1287 | ||
1288 | if (!trace) | |
1289 | return; | |
1290 | tfixnl(); | |
1291 | fprintf(trace, "vcnt = %d, vcline = %d, vliny = ", vcnt, vcline); | |
1292 | for (i = 0; i <= vcnt; i++) { | |
1293 | fprintf(trace, "%d", LINE(i)); | |
1294 | if (FLAGS(i) & VDIRT) | |
1295 | fprintf(trace, "*"); | |
1296 | if (DEPTH(i) != 1) | |
1297 | fprintf(trace, "<%d>", DEPTH(i)); | |
1298 | if (i < vcnt) | |
1299 | fprintf(trace, " "); | |
1300 | } | |
1301 | fprintf(trace, "\n"); | |
1302 | } | |
1303 | ||
1304 | tracec(c) | |
1305 | char c; | |
1306 | { | |
1307 | ||
1308 | if (!techoin) | |
1309 | trubble = 1; | |
1310 | if (c == ESCAPE) | |
1311 | fprintf(trace, "$"); | |
1312 | else if (c < ' ' || c == DELETE) | |
1313 | fprintf(trace, "^%c", ctlof(c)); | |
1314 | else | |
1315 | fprintf(trace, "%c", c); | |
1316 | } | |
1317 | #endif | |
1318 | ||
1319 | /* | |
1320 | * Put a character with possible tracing. | |
1321 | */ | |
1322 | vputch(c) | |
1323 | int c; | |
1324 | { | |
1325 | ||
1326 | #ifdef TRACE | |
1327 | if (trace) | |
1328 | tracec(c); | |
1329 | #endif | |
1330 | vputc(c); | |
1331 | } |