[unix-history] / usr / src / usr.bin / ex / ex_vwind.c

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.proprietary.c%
 */

#ifndef lint
static char sccsid[] = "@(#)ex_vwind.c	8.1 (Berkeley) %G%";
#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();
}
Commit	Line	Data
2791ff57	1	/*-
eb035710 KB	2	* Copyright (c) 1980, 1993
eb035710 KB	3	* The Regents of the University of California. All rights reserved.
2791ff57 KB	4	*
2791ff57 KB	5	* %sccs.include.proprietary.c%
f9679f70 DF	6	*/
	7
	8	#ifndef lint
eb035710	9	static char sccsid[] = "@(#)ex_vwind.c 8.1 (Berkeley) %G%";
2791ff57	10	#endif /* not lint */
f9679f70	11
d31bedb7 MH	12	#include "ex.h"
	13	#include "ex_tty.h"
	14	#include "ex_vis.h"
	15
	16	/*
	17	* Routines to adjust the window, showing specified lines
	18	* in certain positions on the screen, and scrolling in both
	19	* directions. Code here is very dependent on mode (open versus visual).
	20	*/
	21
	22	/*
	23	* Move in a nonlocal way to line addr.
	24	* If it isn't on screen put it in specified context.
	25	* New position for cursor is curs.
	26	* Like most routines here, we vsave().
	27	*/
	28	vmoveto(addr, curs, context)
	29	register line *addr;
	30	char *curs;
	31	char context;
	32	{
	33
	34	markit(addr);
	35	vsave();
	36	vjumpto(addr, curs, context);
	37	}
	38
	39	/*
	40	* Vjumpto is like vmoveto, but doesn't mark previous
	41	* context or save linebuf as current line.
	42	*/
	43	vjumpto(addr, curs, context)
	44	register line *addr;
	45	char *curs;
	46	char context;
	47	{
	48
5a6c967e	49	ignore(noteit(0));
d31bedb7 MH	50	if (context != 0)
	51	vcontext(addr, context);
	52	else
	53	vshow(addr, NOLINE);
5a6c967e	54	ignore(noteit(1));
d31bedb7 MH	55	vnline(curs);
	56	}
	57
	58	/*
	59	* Go up or down cnt (negative is up) to new position curs.
	60	*/
	61	vupdown(cnt, curs)
	62	register int cnt;
	63	char *curs;
	64	{
	65
	66	if (cnt > 0)
	67	vdown(cnt, 0, 0);
	68	else if (cnt < 0)
	69	vup(-cnt, 0, 0);
	70	if (vcnt == 0)
	71	vrepaint(curs);
	72	else
	73	vnline(curs);
	74	}
	75
	76	/*
	77	* Go up cnt lines, afterwards preferring to be ind
	78	* logical lines from the top of the screen.
	79	* If scroll, then we MUST use a scroll.
	80	* Otherwise clear and redraw if motion is far.
	81	*/
	82	vup(cnt, ind, scroll)
	83	register int cnt, ind;
	84	bool scroll;
	85	{
	86	register int i, tot;
	87
	88	if (dot == one) {
	89	beep();
	90	return;
	91	}
	92	vsave();
	93	i = lineDOT() - 1;
	94	if (cnt > i) {
	95	ind -= cnt - i;
	96	if (ind < 0)
	97	ind = 0;
	98	cnt = i;
	99	}
	100	if (!scroll && cnt <= vcline) {
	101	vshow(dot - cnt, NOLINE);
	102	return;
	103	}
	104	cnt -= vcline, dot -= vcline, vcline = 0;
	105	if (hold & HOLDWIG)
	106	goto contxt;
	107	if (state == VISUAL && !AL && !SR &&
5a6c967e	108	cnt <= WTOP - ex_ZERO && vfit(dot - cnt, cnt) <= WTOP - ex_ZERO)
d31bedb7	109	goto okr;
5a6c967e	110	tot = WECHO - ex_ZERO;
d31bedb7 MH	111	if (state != VISUAL \|\| (!AL && !SR) \|\| (!scroll && (cnt > tot \|\| vfit(dot - cnt, cnt) > tot / 3 + 1))) {
	112	if (ind > basWLINES / 2)
	113	ind = basWLINES / 3;
	114	contxt:
	115	vcontext(dot + ind - cnt, '.');
	116	return;
	117	}
	118	okr:
	119	vrollR(cnt);
	120	if (scroll) {
	121	vcline += ind, dot += ind;
	122	if (vcline >= vcnt)
	123	dot -= vcline - vcnt + 1, vcline = vcnt - 1;
	124	getDOT();
	125	}
	126	}
	127
	128	/*
	129	* Like vup, but scrolling down.
	130	*/
	131	vdown(cnt, ind, scroll)
	132	register int cnt, ind;
	133	bool scroll;
	134	{
	135	register int i, tot;
	136
	137	if (dot == dol) {
	138	beep();
	139	return;
	140	}
	141	vsave();
	142	i = dol - dot;
	143	if (cnt > i) {
	144	ind -= cnt - i;
	145	if (ind < 0)
	146	ind = 0;
	147	cnt = i;
	148	}
	149	i = vcnt - vcline - 1;
	150	if (!scroll && cnt <= i) {
	151	vshow(dot + cnt, NOLINE);
	152	return;
	153	}
	154	cnt -= i, dot += i, vcline += i;
	155	if (hold & HOLDWIG)
	156	goto dcontxt;
	157	if (!scroll) {
5a6c967e	158	tot = WECHO - ex_ZERO;
d31bedb7 MH	159	if (state != VISUAL \|\| cnt - tot > 0 \|\| vfit(dot, cnt) > tot / 3 + 1) {
	160	dcontxt:
	161	vcontext(dot + cnt, '.');
	162	return;
	163	}
	164	}
	165	if (cnt > 0)
	166	vroll(cnt);
	167	if (state == VISUAL && scroll) {
	168	vcline -= ind, dot -= ind;
	169	if (vcline < 0)
	170	dot -= vcline, vcline = 0;
	171	getDOT();
	172	}
	173	}
	174
	175	/*
	176	* Show line addr in context where on the screen.
	177	* Work here is in determining new top line implied by
	178	* this placement of line addr, since we always draw from the top.
	179	*/
	180	vcontext(addr, where)
	181	register line *addr;
	182	char where;
	183	{
	184	register line *top;
	185
	186	getline(*addr);
	187	if (state != VISUAL)
	188	top = addr;
	189	else switch (where) {
	190
	191	case '^':
	192	addr = vback(addr, basWLINES - vdepth());
	193	getline(*addr);
	194	/* fall into ... */
	195
	196	case '-':
	197	top = vback(addr, basWLINES - vdepth());
	198	getline(*addr);
	199	break;
	200
	201	case '.':
	202	top = vback(addr, basWLINES / 2 - vdepth());
	203	getline(*addr);
	204	break;
	205
	206	default:
	207	top = addr;
	208	break;
	209	}
	210	if (state == ONEOPEN && LINE(0) == WBOT)
	211	vup1();
	212	vcnt = vcline = 0;
	213	vclean();
	214	if (state == CRTOPEN)
	215	vup1();
	216	vshow(addr, top);
	217	}
	218
	219	/*
	220	* Get a clean line. If we are in a hard open
	221	* we may be able to reuse the line we are on
	222	* if it is blank. This is a real win.
223	*/
224	vclean()
225	{
226
227	if (state != VISUAL && state != CRTOPEN) {
228	destcol = 0;
229	if (!ateopr())
230	vup1();
231	vcnt = 0;
232	}
233	}
234
235	/*
236	* Show line addr with the specified top line on the screen.
237	* Top may be 0; in this case have vcontext compute the top
238	* (and call us recursively). Eventually, we clear the screen
239	* (or its open mode equivalent) and redraw.
240	*/
241	vshow(addr, top)
242	line addr, top;
243	{
244	#ifndef CBREAK
245	register bool fried = 0;
246	#endif
247	register int cnt = addr - dot;
248	register int i = vcline + cnt;
249	short oldhold = hold;
250
251	if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {
252	dot = addr;
253	getDOT();
254	vcline = i;
255	return;
256	}
257	if (state != VISUAL) {
258	dot = addr;
259	vopen(dot, WBOT);
260	return;
261	}
262	if (top == 0) {
263	vcontext(addr, '.');
264	return;
265	}
266	dot = top;
267	#ifndef CBREAK
268	if (vcookit(2))
269	fried++, vcook();
270	#endif
271	oldhold = hold;
272	hold \|= HOLDAT;
273	vclear();
274	vreset(0);
275	vredraw(WTOP);
276	/* error if vcline >= vcnt ! */
277	vcline = addr - top;
278	dot = addr;
279	getDOT();
280	hold = oldhold;
281	vsync(LASTLINE);
282	#ifndef CBREAK
283	if (fried)
284	flusho(), vraw();
285	#endif
286	}
287
288	/*
289	* reset the state.
290	* If inecho then leave us at the beginning of the echo
291	* area; we are called this way in the middle of a :e escape
292	* from visual, e.g.
293	*/
294	vreset(inecho)
295	bool inecho;
296	{
297
298	vcnt = vcline = 0;
299	WTOP = basWTOP;
300	WLINES = basWLINES;
301	if (inecho)
302	splitw = 1, vgoto(WECHO, 0);
303	}
304
305	/*
306	* Starting from which line preceding tp uses almost (but not more
307	* than) cnt physical lines?
308	*/
309	line *
310	vback(tp, cnt)
311	register int cnt;
312	register line *tp;
313	{
314	register int d;
315
316	if (cnt > 0)
317	for (; tp > one; tp--) {
318	getline(tp[-1]);
319	d = vdepth();
320	if (d > cnt)
321	break;
322	cnt -= d;
323	}
324	return (tp);
325	}
326
327	/*
328	* How much scrolling will it take to roll cnt lines starting at tp?
329	*/
330	vfit(tp, cnt)
331	register line *tp;
332	int cnt;
333	{
334	register int j;
335
336	j = 0;
337	while (cnt > 0) {
338	cnt--;
339	getline(tp[cnt]);
340	j += vdepth();
341	}
342	if (tp > dot)
343	j -= WBOT - LASTLINE;
344	return (j);
345	}
346
347	/*
348	* Roll cnt lines onto the screen.
349	*/
350	vroll(cnt)
351	register int cnt;
352	{
353	#ifndef CBREAK
354	register bool fried = 0;
355	#endif
356	short oldhold = hold;
357
358	#ifdef ADEBUG
359	if (trace)
360	tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);
361	#endif
362	if (state != VISUAL)
363	hold \|= HOLDAT\|HOLDROL;
364	if (WBOT == WECHO) {
365	vcnt = 0;
366	if (state == ONEOPEN)
367	vup1();
368	}
369	#ifndef CBREAK
370	if (vcookit(cnt))
371	fried++, vcook();
372	#endif
5a6c967e	373	for (; cnt > 0 && Peek_key != ATTN; cnt--) {
d31bedb7 MH	374	dot++, vcline++;
	375	vopen(dot, LASTLINE);
	376	vscrap();
	377	}
	378	hold = oldhold;
	379	if (state == HARDOPEN)
	380	sethard();
	381	vsyncCL();
	382	#ifndef CBREAK
	383	if (fried)
	384	flusho(), vraw();
	385	#endif
	386	}
	387
	388	/*
	389	* Roll backwards (scroll up).
	390	*/
	391	vrollR(cnt)
	392	register int cnt;
	393	{
d31bedb7 MH	394	short oldhold = hold;
	395
	396	#ifdef ADEBUG
	397	if (trace)
	398	tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
	399	#endif
	400	#ifndef CBREAK
	401	if (vcookit(cnt))
	402	fried++, vcook();
	403	#endif
	404	if (WBOT == WECHO)
	405	vcnt = 0;
	406	heldech = 0;
	407	hold \|= HOLDAT\|HOLDECH;
5a6c967e	408	for (; cnt > 0 && Peek_key != ATTN; cnt--) {
d31bedb7 MH	409	dot--;
	410	vopen(dot, WTOP);
	411	vscrap();
	412	}
	413	hold = oldhold;
	414	if (heldech)
	415	vclrech(0);
	416	vsync(LINE(vcnt-1));
	417	#ifndef CBREAK
	418	if (fried)
	419	flusho(), vraw();
	420	#endif
	421	}
	422
	423	/*
	424	* Go into cooked mode (allow interrupts) during
	425	* a scroll if we are at less than 1200 baud and not
	426	* a 'vi' command, of if we are in a 'vi' command and the
	427	* scroll is more than 2 full screens.
	428	*
	429	* BUG: An interrupt during a scroll in this way
	430	* dumps to command mode.
	431	*/
	432	vcookit(cnt)
	433	register int cnt;
	434	{
	435
	436	return (cnt > 1 && (ospeed < B1200 && !initev \|\| cnt > LINES * 2));
	437	}
	438
	439	/*
	440	* Determine displayed depth of current line.
	441	*/
	442	vdepth()
	443	{
	444	register int d;
	445
5a6c967e	446	d = (column(NOSTR) + WCOLS - 1 + (Put_char == listchar) + IN) / WCOLS;
d31bedb7 MH	447	#ifdef ADEBUG
	448	if (trace)
	449	tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);
	450	#endif
	451	return (d == 0 ? 1 : d);
	452	}
	453
	454	/*
	455	* Move onto a new line, with cursor at position curs.
	456	*/
	457	vnline(curs)
	458	char *curs;
	459	{
	460
	461	if (curs)
	462	wcursor = curs;
	463	else if (vmoving)
	464	wcursor = vfindcol(vmovcol);
	465	else
	466	wcursor = vskipwh(linebuf);
	467	cursor = linebuf;
	468	vmove();
	469	}