Annotation of src/usr.bin/mg/display.c, Revision 1.16
1.16 ! vincent 1: /* $OpenBSD: display.c,v 1.15 2002/07/01 18:01:40 vincent Exp $ */
1.4 niklas 2:
1.1 deraadt 3: /*
4: * The functions in this file handle redisplay. The
5: * redisplay system knows almost nothing about the editing
6: * process; the editing functions do, however, set some
7: * hints to eliminate a lot of the grinding. There is more
8: * that can be done; the "vtputc" interface is a real
9: * pig. Two conditional compilation flags; the GOSLING
10: * flag enables dynamic programming redisplay, using the
11: * algorithm published by Jim Gosling in SIGOA. The MEMMAP
12: * changes things around for memory mapped video. With
13: * both off, the terminal is a VT52.
14: */
15: #include "def.h"
16: #include "kbd.h"
17:
1.16 ! vincent 18: #include <ctype.h>
! 19:
1.1 deraadt 20: /*
21: * You can change these back to the types
22: * implied by the name if you get tight for space. If you
23: * make both of them "int" you get better code on the VAX.
24: * They do nothing if this is not Gosling redisplay, except
25: * for change the size of a structure that isn't used.
26: * A bit of a cheat.
27: */
28: /* These defines really belong in sysdef.h */
29: #ifndef XCHAR
1.3 millert 30: #define XCHAR int
31: #define XSHORT int
1.1 deraadt 32: #endif
33:
34: #ifdef STANDOUT_GLITCH
1.2 millert 35: #include <term.h>
1.1 deraadt 36: #endif
37:
38: /*
39: * A video structure always holds
40: * an array of characters whose length is equal to
1.7 art 41: * the longest line possible. v_text is allocated
42: * dynamically to fit the screen width.
1.1 deraadt 43: */
1.3 millert 44: typedef struct {
1.6 mickey 45: short v_hash; /* Hash code, for compares. */
46: short v_flag; /* Flag word. */
47: short v_color; /* Color of the line. */
48: XSHORT v_cost; /* Cost of display. */
1.7 art 49: char *v_text; /* The actual characters. */
1.3 millert 50: } VIDEO;
51:
52: #define VFCHG 0x0001 /* Changed. */
53: #define VFHBAD 0x0002 /* Hash and cost are bad. */
54: #define VFEXT 0x0004 /* extended line (beond ncol) */
1.1 deraadt 55:
56: /*
57: * SCORE structures hold the optimal
58: * trace trajectory, and the cost of redisplay, when
59: * the dynamic programming redisplay code is used.
60: * If no fancy redisplay, this isn't used. The trace index
61: * fields can be "char", and the score a "short", but
62: * this makes the code worse on the VAX.
63: */
1.3 millert 64: typedef struct {
1.6 mickey 65: XCHAR s_itrace; /* "i" index for track back. */
66: XCHAR s_jtrace; /* "j" index for trace back. */
67: XSHORT s_cost; /* Display cost. */
1.3 millert 68: } SCORE;
69:
1.10 millert 70: void vtmove(int, int);
71: void vtputc(int);
72: void vtpute(int);
1.11 vincent 73: int vtputs(const char *);
1.10 millert 74: void vteeol(void);
75: void updext(int, int);
76: void modeline(MGWIN *);
77: void setscores(int, int);
78: void traceback(int, int, int, int);
79: void ucopy(VIDEO *, VIDEO *);
80: void uline(int, VIDEO *, VIDEO *);
81: void hash(VIDEO *);
1.6 mickey 82:
83:
84: int sgarbf = TRUE; /* TRUE if screen is garbage. */
1.7 art 85: int vtrow = HUGE; /* Virtual cursor row. */
86: int vtcol = HUGE; /* Virtual cursor column. */
1.6 mickey 87: int tthue = CNONE; /* Current color. */
88: int ttrow = HUGE; /* Physical cursor row. */
89: int ttcol = HUGE; /* Physical cursor column. */
90: int tttop = HUGE; /* Top of scroll region. */
91: int ttbot = HUGE; /* Bottom of scroll region. */
92: int lbound = 0; /* leftmost bound of the current line */
1.7 art 93: /* being displayed */
1.3 millert 94:
1.7 art 95: VIDEO **vscreen; /* Edge vector, virtual. */
96: VIDEO **pscreen; /* Edge vector, physical. */
97: VIDEO *video; /* Actual screen data. */
1.6 mickey 98: VIDEO blanks; /* Blank line image. */
1.1 deraadt 99:
100: #ifdef GOSLING
101: /*
102: * This matrix is written as an array because
103: * we do funny things in the "setscores" routine, which
104: * is very compute intensive, to make the subscripts go away.
105: * It would be "SCORE score[NROW][NROW]" in old speak.
106: * Look at "setscores" to understand what is up.
107: */
1.7 art 108: SCORE *score; /* [NROW * NROW] */
109: #endif
110:
111: /*
112: * Reinit the display data structures, this is called when the terminal
113: * size changes.
114: */
115: int
116: vtresize(int force, int newrow, int newcol)
117: {
118: int i;
119: int rowchanged, colchanged;
120: static int first_run = 1;
121: VIDEO *vp;
122:
1.15 vincent 123: if (newrow < 1 || newcol < 1)
124: return (FALSE);
1.7 art 125:
126: rowchanged = (newrow != nrow);
127: colchanged = (newcol != ncol);
128:
129: #define TRYREALLOC(a, n) do { \
130: void *tmp; \
131: if ((tmp = realloc((a), (n))) == NULL) { \
132: panic("out of memory in display code"); \
1.15 vincent 133: } \
1.7 art 134: (a) = tmp; \
135: } while (0)
136:
137: /* No update needed */
138: if (!first_run && !force && !rowchanged && !colchanged) {
1.15 vincent 139: return (TRUE);
1.7 art 140: }
141:
142: if (first_run) {
143: memset(&blanks, 0, sizeof(blanks));
144: }
1.9 deraadt 145:
1.7 art 146: if (rowchanged || first_run) {
147: int vidstart;
148:
149: /*
150: * This is not pretty.
151: */
152: if (nrow == 0)
153: vidstart = 0;
154: else
155: vidstart = 2 * (nrow - 1);
156:
157: /*
158: * We're shrinking, free some internal data
159: */
160: if (newrow < nrow) {
161: for (i = 2 * (newrow - 1); i < 2 * (nrow - 1); i++) {
162: free(video[i].v_text);
163: video[i].v_text = NULL;
164: }
165: }
166:
167: #ifdef GOSLING
168: TRYREALLOC(score, newrow * newrow * sizeof(SCORE));
1.1 deraadt 169: #endif
1.7 art 170: TRYREALLOC(vscreen, (newrow - 1) * sizeof(VIDEO *));
171: TRYREALLOC(pscreen, (newrow - 1) * sizeof(VIDEO *));
172: TRYREALLOC(video, (2 * (newrow - 1)) * sizeof(VIDEO));
173:
174: /*
175: * Zero-out the entries we just allocated
176: */
1.15 vincent 177: for (i = vidstart; i < 2 * (newrow - 1); i++)
1.7 art 178: memset(&video[i], 0, sizeof(VIDEO));
179:
180: /*
181: * Reinitialize vscreen and pscreen arrays completely.
182: */
183: vp = &video[0];
184: for (i = 0; i < newrow - 1; ++i) {
185: vscreen[i] = vp;
186: ++vp;
187: pscreen[i] = vp;
188: ++vp;
189: }
190: }
191: if (rowchanged || colchanged || first_run) {
1.15 vincent 192: for (i = 0; i < 2 * (newrow - 1); i++)
1.7 art 193: TRYREALLOC(video[i].v_text, newcol * sizeof(char));
194: TRYREALLOC(blanks.v_text, newcol * sizeof(char));
195: }
196:
197: nrow = newrow;
198: ncol = newcol;
1.9 deraadt 199:
1.7 art 200: if (ttrow > nrow)
201: ttrow = nrow;
202: if (ttcol > ncol)
203: ttcol = ncol;
204:
1.9 deraadt 205: first_run = 0;
1.15 vincent 206: return (TRUE);
1.7 art 207: }
208:
209: #undef TRYREALLOC
1.1 deraadt 210:
211: /*
212: * Initialize the data structures used
213: * by the display code. The edge vectors used
214: * to access the screens are set up. The operating
215: * system's terminal I/O channel is set up. Fill the
216: * "blanks" array with ASCII blanks. The rest is done
217: * at compile time. The original window is marked
218: * as needing full update, and the physical screen
219: * is marked as garbage, so all the right stuff happens
220: * on the first call to redisplay.
221: */
1.5 art 222: void
1.11 vincent 223: vtinit(void)
1.3 millert 224: {
1.6 mickey 225: int i;
1.1 deraadt 226:
227: ttopen();
228: ttinit();
1.9 deraadt 229:
1.7 art 230: /*
231: * ttinit called ttresize(), which called vtresize(), so our data
232: * structures are setup correctly.
233: */
234:
1.1 deraadt 235: blanks.v_color = CTEXT;
1.7 art 236: for (i = 0; i < ncol; ++i)
1.1 deraadt 237: blanks.v_text[i] = ' ';
238: }
239:
240: /*
241: * Tidy up the virtual display system
242: * in anticipation of a return back to the host
243: * operating system. Right now all we do is position
244: * the cursor to the last line, erase the line, and
245: * close the terminal channel.
246: */
1.5 art 247: void
1.11 vincent 248: vttidy(void)
1.3 millert 249: {
250:
1.1 deraadt 251: ttcolor(CTEXT);
1.3 millert 252: ttnowindow(); /* No scroll window. */
253: ttmove(nrow - 1, 0); /* Echo line. */
1.1 deraadt 254: tteeol();
255: tttidy();
256: ttflush();
257: ttclose();
258: }
259:
260: /*
261: * Move the virtual cursor to an origin
262: * 0 spot on the virtual display screen. I could
263: * store the column as a character pointer to the spot
264: * on the line, which would make "vtputc" a little bit
265: * more efficient. No checking for errors.
266: */
1.5 art 267: void
1.11 vincent 268: vtmove(int row, int col)
1.3 millert 269: {
1.1 deraadt 270: vtrow = row;
271: vtcol = col;
272: }
273:
274: /*
275: * Write a character to the virtual display,
276: * dealing with long lines and the display of unprintable
277: * things like control characters. Also expand tabs every 8
278: * columns. This code only puts printing characters into
279: * the virtual display image. Special care must be taken when
280: * expanding tabs. On a screen whose width is not a multiple
281: * of 8, it is possible for the virtual cursor to hit the
282: * right margin before the next tab stop is reached. This
283: * makes the tab code loop if you are not careful.
284: * Three guesses how we found this.
285: */
1.5 art 286: void
1.11 vincent 287: vtputc(int c)
1.3 millert 288: {
1.6 mickey 289: VIDEO *vp;
1.1 deraadt 290:
1.8 vincent 291: c &= 0xff;
1.9 deraadt 292:
1.1 deraadt 293: vp = vscreen[vtrow];
294: if (vtcol >= ncol)
1.3 millert 295: vp->v_text[ncol - 1] = '$';
1.1 deraadt 296: else if (c == '\t'
297: #ifdef NOTAB
1.3 millert 298: && !(curbp->b_flag & BFNOTAB)
1.1 deraadt 299: #endif
1.3 millert 300: ) {
1.1 deraadt 301: do {
302: vtputc(' ');
1.3 millert 303: } while (vtcol < ncol && (vtcol & 0x07) != 0);
1.1 deraadt 304: } else if (ISCTRL(c)) {
305: vtputc('^');
306: vtputc(CCHR(c));
1.16 ! vincent 307: } else if (isprint(c))
1.1 deraadt 308: vp->v_text[vtcol++] = c;
1.16 ! vincent 309: else {
! 310: char bf[5];
! 311: snprintf(bf, sizeof bf, "\\%o", c);
! 312: vtputs(bf);
! 313: }
1.1 deraadt 314: }
315:
1.3 millert 316: /*
317: * Put a character to the virtual screen in an extended line. If we are not
318: * yet on left edge, don't print it yet. Check for overflow on the right
319: * margin.
1.1 deraadt 320: */
1.5 art 321: void
1.11 vincent 322: vtpute(int c)
1.1 deraadt 323: {
1.3 millert 324: VIDEO *vp;
1.1 deraadt 325:
1.8 vincent 326: c &= 0xff;
1.9 deraadt 327:
1.3 millert 328: vp = vscreen[vtrow];
329: if (vtcol >= ncol)
330: vp->v_text[ncol - 1] = '$';
331: else if (c == '\t'
1.1 deraadt 332: #ifdef NOTAB
1.3 millert 333: && !(curbp->b_flag & BFNOTAB)
1.1 deraadt 334: #endif
1.3 millert 335: ) {
336: do {
337: vtpute(' ');
1.8 vincent 338: } while (((vtcol + lbound) & 0x07) != 0 && vtcol < ncol);
1.3 millert 339: } else if (ISCTRL(c) != FALSE) {
340: vtpute('^');
341: vtpute(CCHR(c));
342: } else {
343: if (vtcol >= 0)
344: vp->v_text[vtcol] = c;
345: ++vtcol;
346: }
347: }
348:
349: /*
350: * Erase from the end of the software cursor to the end of the line on which
351: * the software cursor is located. The display routines will decide if a
352: * hardware erase to end of line command should be used to display this.
1.1 deraadt 353: */
1.5 art 354: void
1.11 vincent 355: vteeol(void)
1.3 millert 356: {
357: VIDEO *vp;
1.1 deraadt 358:
359: vp = vscreen[vtrow];
360: while (vtcol < ncol)
361: vp->v_text[vtcol++] = ' ';
362: }
363:
364: /*
365: * Make sure that the display is
366: * right. This is a three part process. First,
367: * scan through all of the windows looking for dirty
368: * ones. Check the framing, and refresh the screen.
369: * Second, make sure that "currow" and "curcol" are
370: * correct for the current window. Third, make the
371: * virtual and physical screens the same.
372: */
1.5 art 373: void
1.11 vincent 374: update(void)
1.3 millert 375: {
1.6 mickey 376: LINE *lp;
377: MGWIN *wp;
378: VIDEO *vp1;
379: VIDEO *vp2;
380: int i, j;
381: int c;
382: int hflag;
383: int currow;
384: int curcol;
385: int offs;
386: int size;
1.1 deraadt 387:
1.3 millert 388: if (typeahead())
389: return;
390: if (sgarbf) { /* must update everything */
1.1 deraadt 391: wp = wheadp;
1.3 millert 392: while (wp != NULL) {
1.1 deraadt 393: wp->w_flag |= WFMODE | WFHARD;
394: wp = wp->w_wndp;
395: }
396: }
1.3 millert 397: hflag = FALSE; /* Not hard. */
1.8 vincent 398: for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
399: /*
400: * Nothing to be done.
401: */
402: if (wp->w_flag == 0)
403: continue;
1.9 deraadt 404:
1.8 vincent 405: if ((wp->w_flag & WFFORCE) == 0) {
406: lp = wp->w_linep;
407: for (i = 0; i < wp->w_ntrows; ++i) {
408: if (lp == wp->w_dotp)
409: goto out;
410: if (lp == wp->w_bufp->b_linep)
411: break;
412: lp = lforw(lp);
1.1 deraadt 413: }
1.8 vincent 414: }
415: /*
416: * Put the middle-line in place.
417: */
418: i = wp->w_force;
419: if (i > 0) {
420: --i;
421: if (i >= wp->w_ntrows)
422: i = wp->w_ntrows - 1;
423: } else if (i < 0) {
424: i += wp->w_ntrows;
425: if (i < 0)
426: i = 0;
427: } else
1.9 deraadt 428: i = wp->w_ntrows / 2; /* current center, no change */
429:
1.8 vincent 430: /*
431: * Find the line
432: */
433: lp = wp->w_dotp;
434: while (i != 0 && lback(lp) != wp->w_bufp->b_linep) {
435: --i;
436: lp = lback(lp);
437: }
438: wp->w_linep = lp;
439: wp->w_flag |= WFHARD; /* Force full. */
440: out:
441: lp = wp->w_linep; /* Try reduced update. */
442: i = wp->w_toprow;
443: if ((wp->w_flag & ~WFMODE) == WFEDIT) {
444: while (lp != wp->w_dotp) {
445: ++i;
446: lp = lforw(lp);
1.1 deraadt 447: }
1.8 vincent 448: vscreen[i]->v_color = CTEXT;
449: vscreen[i]->v_flag |= (VFCHG | VFHBAD);
450: vtmove(i, 0);
451: for (j = 0; j < llength(lp); ++j)
452: vtputc(lgetc(lp, j));
453: vteeol();
454: } else if ((wp->w_flag & (WFEDIT | WFHARD)) != 0) {
455: hflag = TRUE;
456: while (i < wp->w_toprow + wp->w_ntrows) {
1.1 deraadt 457: vscreen[i]->v_color = CTEXT;
1.3 millert 458: vscreen[i]->v_flag |= (VFCHG | VFHBAD);
1.1 deraadt 459: vtmove(i, 0);
1.8 vincent 460: if (lp != wp->w_bufp->b_linep) {
461: for (j = 0; j < llength(lp); ++j)
462: vtputc(lgetc(lp, j));
463: lp = lforw(lp);
464: }
1.1 deraadt 465: vteeol();
1.8 vincent 466: ++i;
1.1 deraadt 467: }
468: }
1.8 vincent 469: if ((wp->w_flag & WFMODE) != 0)
470: modeline(wp);
471: wp->w_flag = 0;
472: wp->w_force = 0;
1.1 deraadt 473: }
1.3 millert 474: lp = curwp->w_linep; /* Cursor location. */
1.1 deraadt 475: currow = curwp->w_toprow;
476: while (lp != curwp->w_dotp) {
477: ++currow;
478: lp = lforw(lp);
479: }
480: curcol = 0;
481: i = 0;
482: while (i < curwp->w_doto) {
483: c = lgetc(lp, i++);
484: if (c == '\t'
485: #ifdef NOTAB
1.3 millert 486: && !(curbp->b_flag & BFNOTAB)
1.1 deraadt 487: #endif
1.3 millert 488: )
489: curcol |= 0x07;
1.1 deraadt 490: else if (ISCTRL(c) != FALSE)
491: ++curcol;
492: ++curcol;
493: }
1.3 millert 494: if (curcol >= ncol - 1) { /* extended line. */
495: /* flag we are extended and changed */
1.1 deraadt 496: vscreen[currow]->v_flag |= VFEXT | VFCHG;
1.3 millert 497: updext(currow, curcol); /* and output extended line */
498: } else
499: lbound = 0; /* not extended line */
1.1 deraadt 500:
1.3 millert 501: /*
502: * make sure no lines need to be de-extended because the cursor is no
503: * longer on them
504: */
1.1 deraadt 505: wp = wheadp;
506: while (wp != NULL) {
1.3 millert 507: lp = wp->w_linep;
508: i = wp->w_toprow;
509: while (i < wp->w_toprow + wp->w_ntrows) {
510: if (vscreen[i]->v_flag & VFEXT) {
511: /* always flag extended lines as changed */
512: vscreen[i]->v_flag |= VFCHG;
513: if ((wp != curwp) || (lp != wp->w_dotp) ||
514: (curcol < ncol - 1)) {
515: vtmove(i, 0);
516: for (j = 0; j < llength(lp); ++j)
517: vtputc(lgetc(lp, j));
518: vteeol();
519: /* this line no longer is extended */
520: vscreen[i]->v_flag &= ~VFEXT;
521: }
522: }
523: lp = lforw(lp);
524: ++i;
1.1 deraadt 525: }
1.3 millert 526: /* if garbaged then fix up mode lines */
527: if (sgarbf != FALSE)
528: vscreen[i]->v_flag |= VFCHG;
529: /* and onward to the next window */
530: wp = wp->w_wndp;
1.1 deraadt 531: }
532:
1.3 millert 533: if (sgarbf != FALSE) { /* Screen is garbage. */
534: sgarbf = FALSE; /* Erase-page clears */
535: epresf = FALSE; /* the message area. */
536: tttop = HUGE; /* Forget where you set */
537: ttbot = HUGE; /* scroll region. */
538: tthue = CNONE; /* Color unknown. */
1.1 deraadt 539: ttmove(0, 0);
540: tteeop();
1.3 millert 541: for (i = 0; i < nrow - 1; ++i) {
1.1 deraadt 542: uline(i, vscreen[i], &blanks);
543: ucopy(vscreen[i], pscreen[i]);
544: }
545: ttmove(currow, curcol - lbound);
546: ttflush();
547: return;
548: }
549: #ifdef GOSLING
550: if (hflag != FALSE) { /* Hard update? */
1.3 millert 551: for (i = 0; i < nrow - 1; ++i) {/* Compute hash data. */
1.1 deraadt 552: hash(vscreen[i]);
553: hash(pscreen[i]);
554: }
555: offs = 0; /* Get top match. */
1.3 millert 556: while (offs != nrow - 1) {
1.1 deraadt 557: vp1 = vscreen[offs];
558: vp2 = pscreen[offs];
559: if (vp1->v_color != vp2->v_color
1.3 millert 560: || vp1->v_hash != vp2->v_hash)
1.1 deraadt 561: break;
562: uline(offs, vp1, vp2);
563: ucopy(vp1, vp2);
564: ++offs;
565: }
1.3 millert 566: if (offs == nrow - 1) { /* Might get it all. */
1.1 deraadt 567: ttmove(currow, curcol - lbound);
568: ttflush();
569: return;
570: }
1.3 millert 571: size = nrow - 1; /* Get bottom match. */
1.1 deraadt 572: while (size != offs) {
1.3 millert 573: vp1 = vscreen[size - 1];
574: vp2 = pscreen[size - 1];
1.1 deraadt 575: if (vp1->v_color != vp2->v_color
1.3 millert 576: || vp1->v_hash != vp2->v_hash)
1.1 deraadt 577: break;
1.3 millert 578: uline(size - 1, vp1, vp2);
1.1 deraadt 579: ucopy(vp1, vp2);
580: --size;
581: }
582: if ((size -= offs) == 0) /* Get screen size. */
583: panic("Illegal screen size in update");
584: setscores(offs, size); /* Do hard update. */
585: traceback(offs, size, size, size);
1.3 millert 586: for (i = 0; i < size; ++i)
587: ucopy(vscreen[offs + i], pscreen[offs + i]);
1.1 deraadt 588: ttmove(currow, curcol - lbound);
589: ttflush();
590: return;
591: }
592: #endif
1.3 millert 593: for (i = 0; i < nrow - 1; ++i) { /* Easy update. */
1.1 deraadt 594: vp1 = vscreen[i];
595: vp2 = pscreen[i];
1.3 millert 596: if ((vp1->v_flag & VFCHG) != 0) {
1.1 deraadt 597: uline(i, vp1, vp2);
598: ucopy(vp1, vp2);
599: }
600: }
601: ttmove(currow, curcol - lbound);
602: ttflush();
603: }
604:
605: /*
606: * Update a saved copy of a line,
607: * kept in a VIDEO structure. The "vvp" is
608: * the one in the "vscreen". The "pvp" is the one
609: * in the "pscreen". This is called to make the
610: * virtual and physical screens the same when
611: * display has done an update.
612: */
1.5 art 613: void
1.11 vincent 614: ucopy(VIDEO *vvp, VIDEO *pvp)
1.3 millert 615: {
1.1 deraadt 616:
1.3 millert 617: vvp->v_flag &= ~VFCHG; /* Changes done. */
618: pvp->v_flag = vvp->v_flag; /* Update model. */
619: pvp->v_hash = vvp->v_hash;
620: pvp->v_cost = vvp->v_cost;
1.1 deraadt 621: pvp->v_color = vvp->v_color;
622: bcopy(vvp->v_text, pvp->v_text, ncol);
623: }
624:
1.3 millert 625: /*
626: * updext: update the extended line which the cursor is currently on at a
627: * column greater than the terminal width. The line will be scrolled right or
628: * left to let the user see where the cursor is
1.1 deraadt 629: */
1.5 art 630: void
1.11 vincent 631: updext(int currow, int curcol)
1.1 deraadt 632: {
1.6 mickey 633: LINE *lp; /* pointer to current line */
634: int j; /* index into line */
1.1 deraadt 635:
1.13 millert 636: if (ncol < 2)
637: return;
638:
1.3 millert 639: /*
640: * calculate what column the left bound should be
641: * (force cursor into middle half of screen)
642: */
643: lbound = curcol - (curcol % (ncol >> 1)) - (ncol >> 2);
1.13 millert 644:
1.3 millert 645: /*
646: * scan through the line outputing characters to the virtual screen
647: * once we reach the left edge
648: */
649: vtmove(currow, -lbound); /* start scanning offscreen */
650: lp = curwp->w_dotp; /* line to output */
651: for (j = 0; j < llength(lp); ++j) /* until the end-of-line */
652: vtpute(lgetc(lp, j));
653: vteeol(); /* truncate the virtual line */
654: vscreen[currow]->v_text[0] = '$'; /* and put a '$' in column 1 */
1.1 deraadt 655: }
656:
657: /*
658: * Update a single line. This routine only
659: * uses basic functionality (no insert and delete character,
660: * but erase to end of line). The "vvp" points at the VIDEO
661: * structure for the line on the virtual screen, and the "pvp"
662: * is the same for the physical screen. Avoid erase to end of
663: * line when updating CMODE color lines, because of the way that
664: * reverse video works on most terminals.
665: */
1.5 art 666: void
1.11 vincent 667: uline(int row, VIDEO *vvp, VIDEO *pvp)
1.3 millert 668: {
669: char *cp1;
670: char *cp2;
671: char *cp3;
672: char *cp4;
673: char *cp5;
1.6 mickey 674: int nbflag;
1.1 deraadt 675:
1.11 vincent 676: #ifdef MEMMAP
677: putline(row + 1, 1, &vvp->v_text[0]);
678: #else
679:
1.3 millert 680: if (vvp->v_color != pvp->v_color) { /* Wrong color, do a */
681: ttmove(row, 0); /* full redraw. */
1.1 deraadt 682: #ifdef STANDOUT_GLITCH
1.2 millert 683: if (pvp->v_color != CTEXT && magic_cookie_glitch >= 0)
684: tteeol();
1.1 deraadt 685: #endif
686: ttcolor(vvp->v_color);
687: #ifdef STANDOUT_GLITCH
1.2 millert 688: cp1 = &vvp->v_text[magic_cookie_glitch > 0 ? magic_cookie_glitch : 0];
1.3 millert 689: /*
690: * the odd code for magic_cookie_glitch==0 is to avoid
691: * putting the invisable glitch character on the next line.
1.1 deraadt 692: * (Hazeltine executive 80 model 30)
693: */
1.3 millert 694: cp2 = &vvp->v_text[ncol - (magic_cookie_glitch >= 0 ? (magic_cookie_glitch != 0 ? magic_cookie_glitch : 1) : 0)];
1.1 deraadt 695: #else
696: cp1 = &vvp->v_text[0];
697: cp2 = &vvp->v_text[ncol];
698: #endif
699: while (cp1 != cp2) {
700: ttputc(*cp1++);
701: ++ttcol;
702: }
703: #ifndef MOVE_STANDOUT
704: ttcolor(CTEXT);
705: #endif
706: return;
707: }
1.3 millert 708: cp1 = &vvp->v_text[0]; /* Compute left match. */
1.1 deraadt 709: cp2 = &pvp->v_text[0];
1.3 millert 710: while (cp1 != &vvp->v_text[ncol] && cp1[0] == cp2[0]) {
1.1 deraadt 711: ++cp1;
712: ++cp2;
713: }
1.3 millert 714: if (cp1 == &vvp->v_text[ncol]) /* All equal. */
1.1 deraadt 715: return;
716: nbflag = FALSE;
1.3 millert 717: cp3 = &vvp->v_text[ncol]; /* Compute right match. */
1.1 deraadt 718: cp4 = &pvp->v_text[ncol];
719: while (cp3[-1] == cp4[-1]) {
720: --cp3;
721: --cp4;
1.3 millert 722: if (cp3[0] != ' ') /* Note non-blanks in */
723: nbflag = TRUE; /* the right match. */
1.1 deraadt 724: }
1.3 millert 725: cp5 = cp3; /* Is erase good? */
726: if (nbflag == FALSE && vvp->v_color == CTEXT) {
727: while (cp5 != cp1 && cp5[-1] == ' ')
1.1 deraadt 728: --cp5;
729: /* Alcyon hack */
1.3 millert 730: if ((int) (cp3 - cp5) <= tceeol)
1.1 deraadt 731: cp5 = cp3;
732: }
733: /* Alcyon hack */
1.3 millert 734: ttmove(row, (int) (cp1 - &vvp->v_text[0]));
1.1 deraadt 735: #ifdef STANDOUT_GLITCH
1.2 millert 736: if (vvp->v_color != CTEXT && magic_cookie_glitch > 0) {
1.3 millert 737: if (cp1 < &vvp->v_text[magic_cookie_glitch])
738: cp1 = &vvp->v_text[magic_cookie_glitch];
739: if (cp5 > &vvp->v_text[ncol - magic_cookie_glitch])
740: cp5 = &vvp->v_text[ncol - magic_cookie_glitch];
1.2 millert 741: } else if (magic_cookie_glitch < 0)
1.1 deraadt 742: #endif
743: ttcolor(vvp->v_color);
744: while (cp1 != cp5) {
745: ttputc(*cp1++);
746: ++ttcol;
747: }
1.3 millert 748: if (cp5 != cp3) /* Do erase. */
1.1 deraadt 749: tteeol();
750: #endif
751: }
752:
753: /*
1.3 millert 754: * Redisplay the mode line for the window pointed to by the "wp".
755: * This is the only routine that has any idea of how the modeline is
756: * formatted. You can change the modeline format by hacking at this
757: * routine. Called by "update" any time there is a dirty window. Note
758: * that if STANDOUT_GLITCH is defined, first and last magic_cookie_glitch
759: * characters may never be seen.
760: */
1.5 art 761: void
1.11 vincent 762: modeline(MGWIN *wp)
1.3 millert 763: {
1.6 mickey 764: int n;
1.3 millert 765: BUFFER *bp;
1.12 vincent 766: int mode;
1.3 millert 767:
768: n = wp->w_toprow + wp->w_ntrows; /* Location. */
769: vscreen[n]->v_color = CMODE; /* Mode line color. */
770: vscreen[n]->v_flag |= (VFCHG | VFHBAD); /* Recompute, display. */
771: vtmove(n, 0); /* Seek to right line. */
1.1 deraadt 772: bp = wp->w_bufp;
1.3 millert 773: vtputc('-');
774: vtputc('-');
1.12 vincent 775: if ((bp->b_flag & BFREADONLY) != 0) {
776: vtputc('%');
1.14 vincent 777: if ((bp->b_flag & BFCHG) != 0)
778: vtputc('*');
779: else
780: vtputc('%');
1.12 vincent 781: } else if ((bp->b_flag & BFCHG) != 0) { /* "*" if changed. */
1.3 millert 782: vtputc('*');
783: vtputc('*');
1.12 vincent 784: } else {
1.3 millert 785: vtputc('-');
786: vtputc('-');
1.1 deraadt 787: }
788: vtputc('-');
1.3 millert 789: n = 5;
1.1 deraadt 790: n += vtputs("Mg: ");
791: if (bp->b_bname[0] != '\0')
792: n += vtputs(&(bp->b_bname[0]));
1.3 millert 793: while (n < 42) { /* Pad out with blanks */
1.1 deraadt 794: vtputc(' ');
795: ++n;
796: }
797: vtputc('(');
798: ++n;
1.11 vincent 799: for (mode = 0; ; ) {
1.3 millert 800: n += vtputs(bp->b_modes[mode]->p_name);
801: if (++mode > bp->b_nmodes)
802: break;
803: vtputc('-');
804: ++n;
1.1 deraadt 805: }
806: vtputc(')');
807: ++n;
1.3 millert 808: while (n < ncol) { /* Pad out. */
1.1 deraadt 809: vtputc('-');
810: ++n;
811: }
812: }
813: /*
814: * output a string to the mode line, report how long it was.
815: */
1.3 millert 816: int
1.11 vincent 817: vtputs(const char *s)
1.3 millert 818: {
1.11 vincent 819: int n = 0;
1.1 deraadt 820:
821: while (*s != '\0') {
822: vtputc(*s++);
823: ++n;
824: }
825: return n;
826: }
1.3 millert 827:
1.1 deraadt 828: #ifdef GOSLING
829: /*
1.3 millert 830: * Compute the hash code for the line pointed to by the "vp".
831: * Recompute it if necessary. Also set the approximate redisplay
832: * cost. The validity of the hash code is marked by a flag bit.
833: * The cost understand the advantages of erase to end of line.
834: * Tuned for the VAX by Bob McNamara; better than it used to be on
1.1 deraadt 835: * just about any machine.
836: */
1.5 art 837: void
1.11 vincent 838: hash(VIDEO *vp)
1.3 millert 839: {
1.6 mickey 840: int i;
841: int n;
1.3 millert 842: char *s;
843:
844: if ((vp->v_flag & VFHBAD) != 0) { /* Hash bad. */
845: s = &vp->v_text[ncol - 1];
846: for (i = ncol; i != 0; --i, --s)
1.1 deraadt 847: if (*s != ' ')
848: break;
1.3 millert 849: n = ncol - i; /* Erase cheaper? */
1.1 deraadt 850: if (n > tceeol)
851: n = tceeol;
1.3 millert 852: vp->v_cost = i + n; /* Bytes + blanks. */
853: for (n = 0; i != 0; --i, --s)
854: n = (n << 5) + n + *s;
855: vp->v_hash = n; /* Hash code. */
856: vp->v_flag &= ~VFHBAD; /* Flag as all done. */
1.1 deraadt 857: }
858: }
859:
860: /*
861: * Compute the Insert-Delete
862: * cost matrix. The dynamic programming algorithm
863: * described by James Gosling is used. This code assumes
864: * that the line above the echo line is the last line involved
865: * in the scroll region. This is easy to arrange on the VT100
866: * because of the scrolling region. The "offs" is the origin 0
867: * offset of the first row in the virtual/physical screen that
868: * is being updated; the "size" is the length of the chunk of
869: * screen being updated. For a full screen update, use offs=0
870: * and size=nrow-1.
871: *
872: * Older versions of this code implemented the score matrix by
873: * a two dimensional array of SCORE nodes. This put all kinds of
874: * multiply instructions in the code! This version is written to
875: * use a linear array and pointers, and contains no multiplication
876: * at all. The code has been carefully looked at on the VAX, with
877: * only marginal checking on other machines for efficiency. In
878: * fact, this has been tuned twice! Bob McNamara tuned it even
879: * more for the VAX, which is a big issue for him because of
880: * the 66 line X displays.
881: *
882: * On some machines, replacing the "for (i=1; i<=size; ++i)" with
883: * i = 1; do { } while (++i <=size)" will make the code quite a
884: * bit better; but it looks ugly.
885: */
1.5 art 886: void
1.11 vincent 887: setscores(int offs, int size)
1.3 millert 888: {
1.6 mickey 889: SCORE *sp;
890: SCORE *sp1;
891: int tempcost;
892: int bestcost;
893: int j, i;
894: VIDEO **vp, **pp;
895: VIDEO **vbase, **pbase;
1.3 millert 896:
897: vbase = &vscreen[offs - 1]; /* By hand CSE's. */
898: pbase = &pscreen[offs - 1];
899: score[0].s_itrace = 0; /* [0, 0] */
1.1 deraadt 900: score[0].s_jtrace = 0;
1.3 millert 901: score[0].s_cost = 0;
902: sp = &score[1]; /* Row 0, inserts. */
1.1 deraadt 903: tempcost = 0;
904: vp = &vbase[1];
1.3 millert 905: for (j = 1; j <= size; ++j) {
1.1 deraadt 906: sp->s_itrace = 0;
1.3 millert 907: sp->s_jtrace = j - 1;
1.1 deraadt 908: tempcost += tcinsl;
909: tempcost += (*vp)->v_cost;
910: sp->s_cost = tempcost;
911: ++vp;
912: ++sp;
913: }
1.7 art 914: sp = &score[nrow]; /* Column 0, deletes. */
1.1 deraadt 915: tempcost = 0;
1.3 millert 916: for (i = 1; i <= size; ++i) {
917: sp->s_itrace = i - 1;
1.1 deraadt 918: sp->s_jtrace = 0;
1.3 millert 919: tempcost += tcdell;
1.1 deraadt 920: sp->s_cost = tempcost;
1.7 art 921: sp += nrow;
1.1 deraadt 922: }
1.7 art 923: sp1 = &score[nrow + 1]; /* [1, 1]. */
1.1 deraadt 924: pp = &pbase[1];
1.3 millert 925: for (i = 1; i <= size; ++i) {
1.1 deraadt 926: sp = sp1;
927: vp = &vbase[1];
1.3 millert 928: for (j = 1; j <= size; ++j) {
929: sp->s_itrace = i - 1;
1.1 deraadt 930: sp->s_jtrace = j;
1.7 art 931: bestcost = (sp - nrow)->s_cost;
1.3 millert 932: if (j != size) /* Cd(A[i])=0 @ Dis. */
1.1 deraadt 933: bestcost += tcdell;
1.3 millert 934: tempcost = (sp - 1)->s_cost;
1.1 deraadt 935: tempcost += (*vp)->v_cost;
1.3 millert 936: if (i != size) /* Ci(B[j])=0 @ Dsj. */
1.1 deraadt 937: tempcost += tcinsl;
938: if (tempcost < bestcost) {
939: sp->s_itrace = i;
1.3 millert 940: sp->s_jtrace = j - 1;
1.1 deraadt 941: bestcost = tempcost;
942: }
1.7 art 943: tempcost = (sp - nrow - 1)->s_cost;
1.1 deraadt 944: if ((*pp)->v_color != (*vp)->v_color
1.3 millert 945: || (*pp)->v_hash != (*vp)->v_hash)
1.1 deraadt 946: tempcost += (*vp)->v_cost;
947: if (tempcost < bestcost) {
1.3 millert 948: sp->s_itrace = i - 1;
949: sp->s_jtrace = j - 1;
1.1 deraadt 950: bestcost = tempcost;
951: }
952: sp->s_cost = bestcost;
1.3 millert 953: ++sp; /* Next column. */
1.1 deraadt 954: ++vp;
955: }
956: ++pp;
1.7 art 957: sp1 += nrow; /* Next row. */
1.1 deraadt 958: }
959: }
960:
961: /*
962: * Trace back through the dynamic programming cost
963: * matrix, and update the screen using an optimal sequence
964: * of redraws, insert lines, and delete lines. The "offs" is
965: * the origin 0 offset of the chunk of the screen we are about to
966: * update. The "i" and "j" are always started in the lower right
967: * corner of the matrix, and imply the size of the screen.
968: * A full screen traceback is called with offs=0 and i=j=nrow-1.
969: * There is some do-it-yourself double subscripting here,
970: * which is acceptable because this routine is much less compute
971: * intensive then the code that builds the score matrix!
972: */
1.5 art 973: void
1.11 vincent 974: traceback(int offs, int size, int i, int j)
1.6 mickey 975: {
976: int itrace;
977: int jtrace;
978: int k;
979: int ninsl;
980: int ndraw;
981: int ndell;
1.1 deraadt 982:
1.3 millert 983: if (i == 0 && j == 0) /* End of update. */
1.1 deraadt 984: return;
1.7 art 985: itrace = score[(nrow * i) + j].s_itrace;
986: jtrace = score[(nrow * i) + j].s_jtrace;
1.3 millert 987: if (itrace == i) { /* [i, j-1] */
988: ninsl = 0; /* Collect inserts. */
1.1 deraadt 989: if (i != size)
990: ninsl = 1;
991: ndraw = 1;
1.3 millert 992: while (itrace != 0 || jtrace != 0) {
1.7 art 993: if (score[(nrow * itrace) + jtrace].s_itrace != itrace)
1.1 deraadt 994: break;
1.7 art 995: jtrace = score[(nrow * itrace) + jtrace].s_jtrace;
1.1 deraadt 996: if (i != size)
997: ++ninsl;
998: ++ndraw;
999: }
1000: traceback(offs, size, itrace, jtrace);
1001: if (ninsl != 0) {
1002: ttcolor(CTEXT);
1.3 millert 1003: ttinsl(offs + j - ninsl, offs + size - 1, ninsl);
1.1 deraadt 1004: }
1.3 millert 1005: do { /* B[j], A[j] blank. */
1006: k = offs + j - ndraw;
1.1 deraadt 1007: uline(k, vscreen[k], &blanks);
1008: } while (--ndraw);
1009: return;
1010: }
1.3 millert 1011: if (jtrace == j) { /* [i-1, j] */
1012: ndell = 0; /* Collect deletes. */
1.1 deraadt 1013: if (j != size)
1014: ndell = 1;
1.3 millert 1015: while (itrace != 0 || jtrace != 0) {
1.7 art 1016: if (score[(nrow * itrace) + jtrace].s_jtrace != jtrace)
1.1 deraadt 1017: break;
1.7 art 1018: itrace = score[(nrow * itrace) + jtrace].s_itrace;
1.1 deraadt 1019: if (j != size)
1020: ++ndell;
1021: }
1022: if (ndell != 0) {
1023: ttcolor(CTEXT);
1.3 millert 1024: ttdell(offs + i - ndell, offs + size - 1, ndell);
1.1 deraadt 1025: }
1026: traceback(offs, size, itrace, jtrace);
1027: return;
1028: }
1029: traceback(offs, size, itrace, jtrace);
1.3 millert 1030: k = offs + j - 1;
1031: uline(k, vscreen[k], pscreen[offs + i - 1]);
1.1 deraadt 1032: }
1033: #endif
![[BACK]](/icons/back.gif){kind=icon}
Return to display.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / mg