usr/src/cmd/vi/port/ex_vwind.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  27 /*        All Rights Reserved   */
  28
  29
  30 /* Copyright (c) 1981 Regents of the University of California */
  31
  32 #include "ex.h"
  33 #include "ex_tty.h"
  34 #include "ex_vis.h"
  35
  36 /*
  37  * Routines to adjust the window, showing specified lines
  38  * in certain positions on the screen, and scrolling in both
  39  * directions.  Code here is very dependent on mode (open versus visual).
  40  */
  41
  42 /*
  43  * Move in a nonlocal way to line addr.
  44  * If it isn't on screen put it in specified context.
  45  * New position for cursor is curs.
  46  * Like most routines here, we vsave().
  47  */
  48 void
  49 vmoveto(addr, curs, context)
  50         line *addr;
  51         unsigned char *curs;
  52         unsigned char context;
  53 {
  54
  55         markit(addr);
  56         vsave();
  57         vjumpto(addr, curs, context);
  58 }
  59
  60 /*
  61  * Vjumpto is like vmoveto, but doesn't mark previous
  62  * context or save linebuf as current line.
  63  */
  64 void
  65 vjumpto(line *addr, unsigned char *curs, unsigned char context)
  66 {
  67
  68         noteit(0);
  69         if (context != 0)
  70                 vcontext(addr, context);
  71         else
  72                 vshow(addr, NOLINE);
  73         noteit(1);
  74         vnline(curs);
  75 }
  76
  77 /*
  78  * Go up or down cnt (negative is up) to new position curs.
  79  */
  80 void
  81 vupdown(int cnt, unsigned char *curs)
  82 {
  83
  84         if (cnt > 0)
  85                 vdown(cnt, 0, 0);
  86         else if (cnt < 0)
  87                 vup(-cnt, 0, 0);
  88         if (vcnt == 0)
  89                 vrepaint(curs);
  90         else
  91                 vnline(curs);
  92 }
  93
  94 /*
  95  * Go up cnt lines, afterwards preferring to be ind
  96  * logical lines from the top of the screen.
  97  * If scroll, then we MUST use a scroll.
  98  * Otherwise clear and redraw if motion is far.
  99  */
 100 void
 101 vup(int cnt, int ind, bool scroll)
 102 {
 103         int i, tot;
 104
 105         if (dot == one) {
 106                 (void) beep();
 107                 return;
 108         }
 109         vsave();
 110         i = lineDOT() - 1;
 111         if (cnt > i) {
 112                 ind -= cnt - i;
 113                 if (ind < 0)
 114                         ind = 0;
 115                 cnt = i;
 116         }
 117         if (!scroll && cnt <= vcline) {
 118                 vshow(dot - cnt, NOLINE);
 119                 return;
 120         }
 121         cnt -= vcline, dot -= vcline, vcline = 0;
 122         if (hold & HOLDWIG)
 123                 goto contxt;
 124         if (state == VISUAL && !insert_line && !scroll_reverse &&
 125             cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO)
 126                 goto okr;
 127         tot = WECHO - WTOP;
 128         if (state != VISUAL || (!insert_line && !scroll_reverse) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) {
 129                 if (ind > basWLINES / 2)
 130                         ind = basWLINES / 3;
 131 contxt:
 132                 vcontext(dot + ind - cnt, '.');
 133                 return;
 134         }
 135 okr:
 136         vrollR(cnt);
 137         if (scroll) {
 138                 vcline += ind, dot += ind;
 139                 if (vcline >= vcnt)
 140                         dot -= vcline - vcnt + 1, vcline = vcnt - 1;
 141                 getDOT();
 142         }
 143 }
 144
 145 /*
 146  * Like vup, but scrolling down.
 147  */
 148 void
 149 vdown(int cnt, int ind, bool scroll)
 150 {
 151         int i, tot;
 152
 153         if (dot == dol) {
 154                 (void) beep();
 155                 return;
 156         }
 157         vsave();
 158         i = dol - dot;
 159         if (cnt > i) {
 160                 ind -= cnt - i;
 161                 if (ind < 0)
 162                         ind = 0;
 163                 cnt = i;
 164         }
 165         i = vcnt - vcline - 1;
 166         if (!scroll && cnt <= i) {
 167                 vshow(dot + cnt, NOLINE);
 168                 return;
 169         }
 170         cnt -= i, dot += i, vcline += i;
 171         if (hold & HOLDWIG)
 172                 goto dcontxt;
 173         if (!scroll) {
 174                 tot = WECHO - WTOP;
 175                 if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) {
 176 dcontxt:
 177                         vcontext(dot + cnt, '.');
 178                         return;
 179                 }
 180         }
 181         if (cnt > 0)
 182                 vroll(cnt);
 183         if (state == VISUAL && scroll) {
 184                 vcline -= ind, dot -= ind;
 185                 if (vcline < 0)
 186                         dot -= vcline, vcline = 0;
 187                 getDOT();
 188         }
 189 }
 190
 191 /*
 192  * Show line addr in context where on the screen.
 193  * Work here is in determining new top line implied by
 194  * this placement of line addr, since we always draw from the top.
 195  */
 196 void
 197 vcontext(line *addr, unsigned char where)
 198 {
 199         line *top;
 200
 201         getaline(*addr);
 202         if (state != VISUAL)
 203                 top = addr;
 204         else switch (where) {
 205
 206         case '^':
 207                 addr = vback(addr, basWLINES - vdepth());
 208                 getaline(*addr);
 209                 /* fall into ... */
 210
 211         case '-':
 212                 top = vback(addr, basWLINES - vdepth());
 213                 getaline(*addr);
 214                 break;
 215
 216         case '.':
 217                 top = vback(addr, basWLINES / 2 - vdepth());
 218                 getaline(*addr);
 219                 break;
 220
 221         default:
 222                 top = addr;
 223                 break;
 224         }
 225         if (state == ONEOPEN && LINE(0) == WBOT)
 226                 vup1();
 227         vcnt = vcline = 0;
 228         vclean();
 229         if (state == CRTOPEN)
 230                 vup1();
 231         vshow(addr, top);
 232 }
 233
 234 /*
 235  * Get a clean line.  If we are in a hard open
 236  * we may be able to reuse the line we are on
 237  * if it is blank.  This is a real win.
 238  */
 239 void
 240 vclean(void)
 241 {
 242
 243         if (state != VISUAL && state != CRTOPEN) {
 244                 destcol = 0;
 245                 if (!ateopr())
 246                         vup1();
 247                 vcnt = 0;
 248         }
 249 }
 250
 251 /*
 252  * Show line addr with the specified top line on the screen.
 253  * Top may be 0; in this case have vcontext compute the top
 254  * (and call us recursively).  Eventually, we clear the screen
 255  * (or its open mode equivalent) and redraw.
 256  */
 257 void
 258 vshow(line *addr, line *top)
 259 {
 260 #ifndef CBREAK
 261         bool fried = 0;
 262 #endif
 263         int cnt = addr - dot;
 264         int i = vcline + cnt;
 265         short oldhold = hold;
 266
 267         if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {
 268                 dot = addr;
 269                 getDOT();
 270                 vcline = i;
 271                 return;
 272         }
 273         if (state != VISUAL) {
 274                 dot = addr;
 275                 vopen(dot, WBOT);
 276                 return;
 277         }
 278         if (top == 0) {
 279                 vcontext(addr, '.');
 280                 return;
 281         }
 282         dot = top;
 283 #ifndef CBREAK
 284         if (vcookit(2))
 285                 fried++, vcook();
 286 #endif
 287         oldhold = hold;
 288         hold |= HOLDAT;
 289         vclear();
 290         vreset(0);
 291         vredraw(WTOP);
 292         /* error if vcline >= vcnt ! */
 293         vcline = addr - top;
 294         dot = addr;
 295         getDOT();
 296         hold = oldhold;
 297         vsync(LASTLINE);
 298 #ifndef CBREAK
 299         if (fried)
 300                 flusho(), vraw();
 301 #endif
 302 }
 303
 304 /*
 305  * reset the state.
 306  * If inecho then leave us at the beginning of the echo
 307  * area;  we are called this way in the middle of a :e escape
 308  * from visual, e.g.
 309  */
 310 void
 311 vreset(bool inecho)
 312 {
 313
 314         vcnt = vcline = 0;
 315         WTOP = basWTOP;
 316         WLINES = basWLINES;
 317         if (inecho)
 318                 splitw = 1, vgoto(WECHO, 0);
 319 }
 320
 321 /*
 322  * Starting from which line preceding tp uses almost (but not more
 323  * than) cnt physical lines?
 324  */
 325 line *
 326 vback(tp, cnt)
 327         int cnt;
 328         line *tp;
 329 {
 330         int d;
 331
 332         if (cnt > 0)
 333                 for (; tp > one; tp--) {
 334                         getaline(tp[-1]);
 335                         d = vdepth();
 336                         if (d > cnt)
 337                                 break;
 338                         cnt -= d;
 339                 }
 340         return (tp);
 341 }
 342
 343 /*
 344  * How much scrolling will it take to roll cnt lines starting at tp?
 345  */
 346 int
 347 vfit(line *tp, int cnt)
 348 {
 349         int j;
 350
 351         j = 0;
 352         while (cnt > 0) {
 353                 cnt--;
 354                 getaline(tp[cnt]);
 355                 j += vdepth();
 356         }
 357         if (tp > dot)
 358                 j -= WBOT - LASTLINE;
 359         return (j);
 360 }
 361
 362 /*
 363  * Roll cnt lines onto the screen.
 364  */
 365 void
 366 vroll(int cnt)
 367 {
 368 #ifndef CBREAK
 369         bool fried = 0;
 370 #endif
 371         short oldhold = hold;
 372
 373 #ifdef ADEBUG
 374         if (trace)
 375                 tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);
 376 #endif
 377         if (state != VISUAL)
 378                 hold |= HOLDAT|HOLDROL;
 379         if (WBOT == WECHO) {
 380                 vcnt = 0;
 381                 if (state == ONEOPEN)
 382                         vup1();
 383         }
 384 #ifndef CBREAK
 385         if (vcookit(cnt))
 386                 fried++, vcook();
 387 #endif
 388         for (; cnt > 0 && Peekkey != ATTN; cnt--) {
 389                 dot++, vcline++;
 390                 vopen(dot, LASTLINE);
 391                 vscrap();
 392         }
 393         hold = oldhold;
 394         if (state == HARDOPEN)
 395                 sethard();
 396         vsyncCL();
 397 #ifndef CBREAK
 398         if (fried)
 399                 flusho(), vraw();
 400 #endif
 401 }
 402
 403 /*
 404  * Roll backwards (scroll up).
 405  */
 406 void
 407 vrollR(int cnt)
 408 {
 409         bool fried = 0;
 410         short oldhold = hold;
 411
 412 #ifdef ADEBUG
 413         if (trace)
 414                 tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
 415 #endif
 416 #ifndef CBREAK
 417         if (vcookit(cnt))
 418                 fried++, vcook();
 419 #endif
 420         if (WBOT == WECHO)
 421                 vcnt = 0;
 422         heldech = 0;
 423         hold |= HOLDAT|HOLDECH;
 424         for (; cnt > 0 && Peekkey != ATTN; cnt--) {
 425                 dot--;
 426                 vopen(dot, WTOP);
 427                 vscrap();
 428         }
 429         hold = oldhold;
 430         if (heldech)
 431                 vclrech(0);
 432         vsync(LINE(vcnt-1));
 433 #ifndef CBREAK
 434         if (fried)
 435                 flusho(), vraw();
 436 #endif
 437 }
 438
 439 /*
 440  * Go into cooked mode (allow interrupts) during
 441  * a scroll if we are at less than 1200 baud and not
 442  * a 'vi' command, of if we are in a 'vi' command and the
 443  * scroll is more than 2 full screens.
 444  *
 445  * BUG:         An interrupt during a scroll in this way
 446  *              dumps to command mode.
 447  */
 448 int
 449 vcookit(int cnt)
 450 {
 451
 452         return (cnt > 1 && (ospeed < B1200 && !initev || cnt > lines * 2));
 453 }
 454
 455 /*
 456  * Determine displayed depth of current line.
 457  */
 458 int
 459 vdepth(void)
 460 {
 461         int d;
 462
 463         d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + insert_null_glitch) / WCOLS;
 464 #ifdef ADEBUG
 465         if (trace)
 466                 tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);
 467 #endif
 468         return (d == 0 ? 1 : d);
 469 }
 470
 471 /*
 472  * Move onto a new line, with cursor at position curs.
 473  */
 474 void
 475 vnline(unsigned char *curs)
 476 {
 477         unsigned char *owcursor;
 478         int j;
 479         if (curs) {
 480                 if(curs >= strend(linebuf)) {
 481                         if(!*linebuf)
 482                                 wcursor = linebuf;
 483                         else {
 484                                 wcursor = strend(linebuf);
 485                                 wcursor = lastchr(linebuf, wcursor);
 486                         }
 487                 } else {
 488                         owcursor = wcursor = curs;
 489                         j = wcursor - linebuf;
 490                         for(wcursor = linebuf; wcursor - linebuf < j; ) {
 491                                 owcursor = wcursor;
 492                                 wcursor = nextchr(wcursor);
 493                         }
 494                         if(wcursor - linebuf > j)
 495                                 wcursor = owcursor;
 496                 }
 497
 498         } else if (vmoving)
 499                 wcursor = vfindcol(vmovcol);
 500         else
 501                 wcursor = vskipwh(linebuf);
 502         cursor = linebuf;
 503         (void) vmove();
 504 }