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- /*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
-
- #ifndef lint
- static char *sccsid = "@(#)ex_vwind.c 7.4 (Berkeley) 3/9/87; 1.2 (Bellcore) 87/04/24";
- #endif not lint
-
- #include "ex.h"
- #include "ex_tty.h"
- #include "ex_vis.h"
-
- /*
- * Routines to adjust the window, showing specified lines
- * in certain positions on the screen, and scrolling in both
- * directions. Code here is very dependent on mode (open versus visual).
- */
-
- /*
- * Move in a nonlocal way to line addr.
- * If it isn't on screen put it in specified context.
- * New position for cursor is curs.
- * Like most routines here, we vsave().
- */
- vmoveto(addr, curs, context)
- register line *addr;
- char *curs;
- char context;
- {
-
- markit(addr);
- vsave();
- vjumpto(addr, curs, context);
- }
-
- /*
- * Vjumpto is like vmoveto, but doesn't mark previous
- * context or save linebuf as current line.
- */
- vjumpto(addr, curs, context)
- register line *addr;
- char *curs;
- char context;
- {
-
- ignore(noteit(0));
- if (context != 0)
- vcontext(addr, context);
- else
- vshow(addr, NOLINE);
- ignore(noteit(1));
- vnline(curs);
- }
-
- /*
- * Go up or down cnt (negative is up) to new position curs.
- */
- vupdown(cnt, curs)
- register int cnt;
- char *curs;
- {
-
- if (cnt > 0)
- vdown(cnt, 0, 0);
- else if (cnt < 0)
- vup(-cnt, 0, 0);
- if (vcnt == 0)
- vrepaint(curs);
- else
- vnline(curs);
- }
-
- /*
- * Go up cnt lines, afterwards preferring to be ind
- * logical lines from the top of the screen.
- * If scroll, then we MUST use a scroll.
- * Otherwise clear and redraw if motion is far.
- */
- vup(cnt, ind, scroll)
- register int cnt, ind;
- bool scroll;
- {
- register int i, tot;
-
- if (dot == one) {
- beep();
- return;
- }
- vsave();
- i = lineDOT() - 1;
- if (cnt > i) {
- ind -= cnt - i;
- if (ind < 0)
- ind = 0;
- cnt = i;
- }
- if (!scroll && cnt <= vcline) {
- vshow(dot - cnt, NOLINE);
- return;
- }
- cnt -= vcline, dot -= vcline, vcline = 0;
- if (hold & HOLDWIG)
- goto contxt;
- if (state == VISUAL && !AL && !SR &&
- cnt <= WTOP - ex_ZERO && vfit(dot - cnt, cnt) <= WTOP - ex_ZERO)
- goto okr;
- tot = WECHO - ex_ZERO;
- if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) {
- if (ind > basWLINES / 2)
- ind = basWLINES / 3;
- contxt:
- vcontext(dot + ind - cnt, '.');
- return;
- }
- okr:
- vrollR(cnt);
- if (scroll) {
- vcline += ind, dot += ind;
- if (vcline >= vcnt)
- dot -= vcline - vcnt + 1, vcline = vcnt - 1;
- getDOT();
- }
- }
-
- /*
- * Like vup, but scrolling down.
- */
- vdown(cnt, ind, scroll)
- register int cnt, ind;
- bool scroll;
- {
- register int i, tot;
-
- if (dot == dol) {
- beep();
- return;
- }
- vsave();
- i = dol - dot;
- if (cnt > i) {
- ind -= cnt - i;
- if (ind < 0)
- ind = 0;
- cnt = i;
- }
- i = vcnt - vcline - 1;
- if (!scroll && cnt <= i) {
- vshow(dot + cnt, NOLINE);
- return;
- }
- cnt -= i, dot += i, vcline += i;
- if (hold & HOLDWIG)
- goto dcontxt;
- if (!scroll) {
- tot = WECHO - ex_ZERO;
- if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) {
- dcontxt:
- vcontext(dot + cnt, '.');
- return;
- }
- }
- if (cnt > 0)
- vroll(cnt);
- if (state == VISUAL && scroll) {
- vcline -= ind, dot -= ind;
- if (vcline < 0)
- dot -= vcline, vcline = 0;
- getDOT();
- }
- }
-
- /*
- * Show line addr in context where on the screen.
- * Work here is in determining new top line implied by
- * this placement of line addr, since we always draw from the top.
- */
- vcontext(addr, where)
- register line *addr;
- char where;
- {
- register line *top;
-
- getline(*addr);
- if (state != VISUAL)
- top = addr;
- else switch (where) {
-
- case '^':
- addr = vback(addr, basWLINES - vdepth());
- getline(*addr);
- /* fall into ... */
-
- case '-':
- top = vback(addr, basWLINES - vdepth());
- getline(*addr);
- break;
-
- case '.':
- top = vback(addr, basWLINES / 2 - vdepth());
- getline(*addr);
- break;
-
- default:
- top = addr;
- break;
- }
- if (state == ONEOPEN && LINE(0) == WBOT)
- vup1();
- vcnt = vcline = 0;
- vclean();
- if (state == CRTOPEN)
- vup1();
- vshow(addr, top);
- }
-
- /*
- * Get a clean line. If we are in a hard open
- * we may be able to reuse the line we are on
- * if it is blank. This is a real win.
- */
- vclean()
- {
-
- if (state != VISUAL && state != CRTOPEN) {
- destcol = 0;
- if (!ateopr())
- vup1();
- vcnt = 0;
- }
- }
-
- /*
- * Show line addr with the specified top line on the screen.
- * Top may be 0; in this case have vcontext compute the top
- * (and call us recursively). Eventually, we clear the screen
- * (or its open mode equivalent) and redraw.
- */
- vshow(addr, top)
- line *addr, *top;
- {
- #ifndef CBREAK
- register bool fried = 0;
- #endif
- register int cnt = addr - dot;
- register int i = vcline + cnt;
- short oldhold = hold;
-
- if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {
- dot = addr;
- getDOT();
- vcline = i;
- return;
- }
- if (state != VISUAL) {
- dot = addr;
- vopen(dot, WBOT);
- return;
- }
- if (top == 0) {
- vcontext(addr, '.');
- return;
- }
- dot = top;
- #ifndef CBREAK
- if (vcookit(2))
- fried++, vcook();
- #endif
- oldhold = hold;
- hold |= HOLDAT;
- vclear();
- vreset(0);
- vredraw(WTOP);
- /* error if vcline >= vcnt ! */
- vcline = addr - top;
- dot = addr;
- getDOT();
- hold = oldhold;
- vsync(LASTLINE);
- #ifndef CBREAK
- if (fried)
- flusho(), vraw();
- #endif
- }
-
- /*
- * reset the state.
- * If inecho then leave us at the beginning of the echo
- * area; we are called this way in the middle of a :e escape
- * from visual, e.g.
- */
- vreset(inecho)
- bool inecho;
- {
-
- vcnt = vcline = 0;
- WTOP = basWTOP;
- WLINES = basWLINES;
- if (inecho)
- splitw = 1, vgoto(WECHO, 0);
- }
-
- /*
- * Starting from which line preceding tp uses almost (but not more
- * than) cnt physical lines?
- */
- line *
- vback(tp, cnt)
- register int cnt;
- register line *tp;
- {
- register int d;
-
- if (cnt > 0)
- for (; tp > one; tp--) {
- getline(tp[-1]);
- d = vdepth();
- if (d > cnt)
- break;
- cnt -= d;
- }
- return (tp);
- }
-
- /*
- * How much scrolling will it take to roll cnt lines starting at tp?
- */
- vfit(tp, cnt)
- register line *tp;
- int cnt;
- {
- register int j;
-
- j = 0;
- while (cnt > 0) {
- cnt--;
- getline(tp[cnt]);
- j += vdepth();
- }
- if (tp > dot)
- j -= WBOT - LASTLINE;
- return (j);
- }
-
- /*
- * Roll cnt lines onto the screen.
- */
- vroll(cnt)
- register int cnt;
- {
- #ifndef CBREAK
- register bool fried = 0;
- #endif
- short oldhold = hold;
-
- #ifdef ADEBUG
- if (trace)
- tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);
- #endif
- if (state != VISUAL)
- hold |= HOLDAT|HOLDROL;
- if (WBOT == WECHO) {
- vcnt = 0;
- if (state == ONEOPEN)
- vup1();
- }
- #ifndef CBREAK
- if (vcookit(cnt))
- fried++, vcook();
- #endif
- for (; cnt > 0 && Peek_key != ATTN; cnt--) {
- dot++, vcline++;
- vopen(dot, LASTLINE);
- vscrap();
- }
- hold = oldhold;
- if (state == HARDOPEN)
- sethard();
- vsyncCL();
- #ifndef CBREAK
- if (fried)
- flusho(), vraw();
- #endif
- }
-
- /*
- * Roll backwards (scroll up).
- */
- vrollR(cnt)
- register int cnt;
- {
- short oldhold = hold;
-
- #ifdef ADEBUG
- if (trace)
- tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
- #endif
- #ifndef CBREAK
- if (vcookit(cnt))
- fried++, vcook();
- #endif
- if (WBOT == WECHO)
- vcnt = 0;
- heldech = 0;
- hold |= HOLDAT|HOLDECH;
- for (; cnt > 0 && Peek_key != ATTN; cnt--) {
- dot--;
- vopen(dot, WTOP);
- vscrap();
- }
- hold = oldhold;
- if (heldech)
- vclrech(0);
- vsync(LINE(vcnt-1));
- #ifndef CBREAK
- if (fried)
- flusho(), vraw();
- #endif
- }
-
- /*
- * Go into cooked mode (allow interrupts) during
- * a scroll if we are at less than 1200 baud and not
- * a 'vi' command, of if we are in a 'vi' command and the
- * scroll is more than 2 full screens.
- *
- * BUG: An interrupt during a scroll in this way
- * dumps to command mode.
- */
- vcookit(cnt)
- register int cnt;
- {
-
- return (cnt > 1 && (ospeed < B1200 && !initev || cnt > LINES * 2));
- }
-
- /*
- * Determine displayed depth of current line.
- */
- vdepth()
- {
- register int d;
-
- d = (column(NOSTR) + WCOLS - 1 + (Put_char == listchar) + IN) / WCOLS;
- #ifdef ADEBUG
- if (trace)
- tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);
- #endif
- return (d == 0 ? 1 : d);
- }
-
- /*
- * Move onto a new line, with cursor at position curs.
- */
- vnline(curs)
- char *curs;
- {
-
- if (curs)
- wcursor = curs;
- else if (vmoving)
- wcursor = vfindcol(vmovcol);
- else
- wcursor = vskipwh(linebuf);
- cursor = linebuf;
- vmove();
- }
-