[dragonfly.git] / usr.bin / window / wwscroll.c

/*	@(#)wwscroll.c	8.1 (Berkeley) 6/6/93	*/
/*	$NetBSD: wwscroll.c,v 1.7 2003/08/07 11:17:44 agc Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdlib.h>

#include "ww.h"
#include "tt.h"
#include "xx.h"

void
wwscroll(struct ww *w, int n)
{
	int dir;
	int top;

	if (n == 0)
		return;
	dir = n < 0 ? -1 : 1;
	top = w->ww_b.t - n;
	if (top > w->ww_w.t)
		top = w->ww_w.t;
	else if (top + w->ww_b.nr < w->ww_w.b)
		top = w->ww_w.b - w->ww_b.nr;
	n = abs(top - w->ww_b.t);
	if (n < w->ww_i.nr) {
		while (--n >= 0) {
			(void) wwscroll1(w, w->ww_i.t, w->ww_i.b, dir, 0);
			w->ww_buf += dir;
			w->ww_b.t -= dir;
			w->ww_b.b -= dir;
		}
	} else {
		w->ww_buf -= top - w->ww_b.t;
		w->ww_b.t = top;
		w->ww_b.b = top + w->ww_b.nr;
		wwredrawwin(w);
	}
}

/*
 * Scroll one line, between 'row1' and 'row2', in direction 'dir'.
 * Don't adjust ww_scroll.
 * And don't redraw 'leaveit' lines.
 */
int
wwscroll1(struct ww *w, int row1, int row2, int dir, int leaveit)
{
	int i;
	int row1x, row2x;
	int nvis;
	int nvismax;
	int scrolled = 0;

	/*
	 * See how many lines on the screen are affected.
	 * And calculate row1x, row2x, and left at the same time.
	 */
	for (i = row1; i < row2 && w->ww_nvis[i] == 0; i++)
		;
	if (i >= row2)			/* can't do any fancy stuff */
		goto out;
	row1x = i;
	for (i = row2 - 1; i >= row1 && w->ww_nvis[i] == 0; i--)
		;
	if (i <= row1x)
		goto out;		/* just one line is easy */
	row2x = i + 1;

	/*
	 * See how much of this window is visible.
	 */
	nvismax = wwncol * (row2x - row1x);
	nvis = 0;
	for (i = row1x; i < row2x; i++)
		nvis += w->ww_nvis[i];

	/*
	 * If it's a good idea to scroll and the terminal can, then do it.
	 */
	if (nvis < nvismax / 2)
		goto no_scroll;		/* not worth it */
	if ((dir > 0 ? tt.tt_scroll_down == 0 : tt.tt_scroll_up == 0) ||
	    ((tt.tt_scroll_top != row1x || tt.tt_scroll_bot != row2x - 1) &&
	    tt.tt_setscroll == 0))
		if (tt.tt_delline == 0 || tt.tt_insline == 0)
			goto no_scroll;
	xxscroll(dir, row1x, row2x);
	scrolled = 1;
	/*
	 * Fix up the old screen.
	 */
	{
		union ww_char *tmp;
		union ww_char **cpp, **cqq;

		if (dir > 0) {
			cpp = &wwos[row1x];
			cqq = cpp + 1;
			tmp = *cpp;
			for (i = row2x - row1x; --i > 0;)
				*cpp++ = *cqq++;
			*cpp = tmp;
		} else {
			cpp = &wwos[row2x];
			cqq = cpp - 1;
			tmp = *cqq;
			for (i = row2x - row1x; --i > 0;)
				*--cpp = *--cqq;
			*cqq = tmp;
		}
		for (i = wwncol; --i >= 0;)
			tmp++->c_w = ' ';
	}

no_scroll:
	/*
	 * Fix the new screen.
	 */
	if (nvis == nvismax) {
		/*
		 * Can shift whole lines.
		 */
		if (dir > 0) {
			{
				union ww_char *tmp;
				union ww_char **cpp, **cqq;

				cpp = &wwns[row1x];
				cqq = cpp + 1;
				tmp = *cpp;
				for (i = row2x - row1x; --i > 0;)
					*cpp++ = *cqq++;
				*cpp = tmp;
			}
			if (scrolled) {
				char *p, *q;

				p = &wwtouched[row1x];
				q = p + 1;
				for (i = row2x - row1x; --i > 0;)
					*p++ = *q++;
				*p |= WWU_TOUCHED;
			} else {
				char *p;

				p = &wwtouched[row1x];
				for (i = row2x - row1x; --i >= 0;)
					*p++ |= WWU_TOUCHED;
			}
			wwredrawwin1(w, row1, row1x, dir);
			wwredrawwin1(w, row2x - 1, row2 - leaveit, dir);
		} else {
			{
				union ww_char *tmp;
				union ww_char **cpp, **cqq;

				cpp = &wwns[row2x];
				cqq = cpp - 1;
				tmp = *cqq;
				for (i = row2x - row1x; --i > 0;)
					*--cpp = *--cqq;
				*cqq = tmp;
			}
			if (scrolled) {
				char *p, *q;

				p = &wwtouched[row2x];
				q = p - 1;
				for (i = row2x - row1x; --i > 0;)
					*--p = *--q;
				*q |= WWU_TOUCHED;
			} else {
				char *p;

				p = &wwtouched[row1x];
				for (i = row2x - row1x; --i >= 0;)
					*p++ |= WWU_TOUCHED;
			}
			wwredrawwin1(w, row1 + leaveit, row1x + 1, dir);
			wwredrawwin1(w, row2x, row2, dir);
		}
	} else {
		if (scrolled) {
			char *p;

			p = &wwtouched[row1x];
			for (i = row2x - row1x; --i >= 0;)
				*p++ |= WWU_TOUCHED;
		}
out:
		if (dir > 0)
			wwredrawwin1(w, row1, row2 - leaveit, dir);
		else
			wwredrawwin1(w, row1 + leaveit, row2, dir);
	}
	return scrolled;
}
Commit	Line	Data
2c872e05	1	/* @(#)wwscroll.c 8.1 (Berkeley) 6/6/93 */
abecab39 SW	2	/* $NetBSD: wwscroll.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */
abecab39 SW	3
984263bc MD	4	/*
	5	* Copyright (c) 1983, 1993
	6	* The Regents of the University of California. All rights reserved.
	7	*
	8	* This code is derived from software contributed to Berkeley by
	9	* Edward Wang at The University of California, Berkeley.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
abecab39	19	* 3. Neither the name of the University nor the names of its contributors
984263bc MD	20	* may be used to endorse or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*/
	35
abecab39 SW	36	#include <stdlib.h>
abecab39 SW	37
984263bc MD	38	#include "ww.h"
984263bc MD	39	#include "tt.h"
abecab39	40	#include "xx.h"
984263bc	41
abecab39 SW	42	void
abecab39 SW	43	wwscroll(struct ww *w, int n)
984263bc	44	{
abecab39 SW	45	int dir;
abecab39 SW	46	int top;
984263bc MD	47
	48	if (n == 0)
	49	return;
	50	dir = n < 0 ? -1 : 1;
	51	top = w->ww_b.t - n;
	52	if (top > w->ww_w.t)
	53	top = w->ww_w.t;
	54	else if (top + w->ww_b.nr < w->ww_w.b)
	55	top = w->ww_w.b - w->ww_b.nr;
	56	n = abs(top - w->ww_b.t);
	57	if (n < w->ww_i.nr) {
	58	while (--n >= 0) {
	59	(void) wwscroll1(w, w->ww_i.t, w->ww_i.b, dir, 0);
	60	w->ww_buf += dir;
	61	w->ww_b.t -= dir;
	62	w->ww_b.b -= dir;
	63	}
	64	} else {
	65	w->ww_buf -= top - w->ww_b.t;
	66	w->ww_b.t = top;
	67	w->ww_b.b = top + w->ww_b.nr;
	68	wwredrawwin(w);
	69	}
	70	}
	71
	72	/*
	73	* Scroll one line, between 'row1' and 'row2', in direction 'dir'.
	74	* Don't adjust ww_scroll.
	75	* And don't redraw 'leaveit' lines.
	76	*/
abecab39 SW	77	int
abecab39 SW	78	wwscroll1(struct ww *w, int row1, int row2, int dir, int leaveit)
984263bc	79	{
abecab39	80	int i;
984263bc MD	81	int row1x, row2x;
	82	int nvis;
	83	int nvismax;
	84	int scrolled = 0;
	85
	86	/*
	87	* See how many lines on the screen are affected.
	88	* And calculate row1x, row2x, and left at the same time.
	89	*/
	90	for (i = row1; i < row2 && w->ww_nvis[i] == 0; i++)
	91	;
	92	if (i >= row2) /* can't do any fancy stuff */
	93	goto out;
	94	row1x = i;
	95	for (i = row2 - 1; i >= row1 && w->ww_nvis[i] == 0; i--)
	96	;
	97	if (i <= row1x)
	98	goto out; /* just one line is easy */
	99	row2x = i + 1;
	100
	101	/*
	102	* See how much of this window is visible.
	103	*/
	104	nvismax = wwncol * (row2x - row1x);
	105	nvis = 0;
	106	for (i = row1x; i < row2x; i++)
	107	nvis += w->ww_nvis[i];
	108
	109	/*
	110	* If it's a good idea to scroll and the terminal can, then do it.
	111	*/
	112	if (nvis < nvismax / 2)
	113	goto no_scroll; /* not worth it */
	114	if ((dir > 0 ? tt.tt_scroll_down == 0 : tt.tt_scroll_up == 0) \|\|
abecab39 SW	115	((tt.tt_scroll_top != row1x \|\| tt.tt_scroll_bot != row2x - 1) &&
abecab39 SW	116	tt.tt_setscroll == 0))
984263bc MD	117	if (tt.tt_delline == 0 \|\| tt.tt_insline == 0)
	118	goto no_scroll;
	119	xxscroll(dir, row1x, row2x);
	120	scrolled = 1;
	121	/*
	122	* Fix up the old screen.
	123	*/
	124	{
abecab39 SW	125	union ww_char *tmp;
abecab39 SW	126	union ww_char cpp, cqq;
984263bc MD	127
	128	if (dir > 0) {
	129	cpp = &wwos[row1x];
	130	cqq = cpp + 1;
	131	tmp = *cpp;
	132	for (i = row2x - row1x; --i > 0;)
	133	cpp++ = cqq++;
	134	*cpp = tmp;
	135	} else {
	136	cpp = &wwos[row2x];
	137	cqq = cpp - 1;
	138	tmp = *cqq;
	139	for (i = row2x - row1x; --i > 0;)
	140	--cpp = --cqq;
	141	*cqq = tmp;
	142	}
	143	for (i = wwncol; --i >= 0;)
	144	tmp++->c_w = ' ';
	145	}
	146
	147	no_scroll:
	148	/*
	149	* Fix the new screen.
	150	*/
	151	if (nvis == nvismax) {
	152	/*
	153	* Can shift whole lines.
	154	*/
	155	if (dir > 0) {
	156	{
abecab39 SW	157	union ww_char *tmp;
abecab39 SW	158	union ww_char cpp, cqq;
984263bc MD	159
	160	cpp = &wwns[row1x];
	161	cqq = cpp + 1;
	162	tmp = *cpp;
	163	for (i = row2x - row1x; --i > 0;)
	164	cpp++ = cqq++;
	165	*cpp = tmp;
	166	}
	167	if (scrolled) {
abecab39	168	char p, q;
984263bc MD	169
	170	p = &wwtouched[row1x];
	171	q = p + 1;
	172	for (i = row2x - row1x; --i > 0;)
	173	p++ = q++;
	174	*p \|= WWU_TOUCHED;
	175	} else {
abecab39	176	char *p;
984263bc MD	177
	178	p = &wwtouched[row1x];
	179	for (i = row2x - row1x; --i >= 0;)
	180	*p++ \|= WWU_TOUCHED;
	181	}
	182	wwredrawwin1(w, row1, row1x, dir);
	183	wwredrawwin1(w, row2x - 1, row2 - leaveit, dir);
	184	} else {
	185	{
abecab39 SW	186	union ww_char *tmp;
abecab39 SW	187	union ww_char cpp, cqq;
984263bc MD	188
	189	cpp = &wwns[row2x];
	190	cqq = cpp - 1;
	191	tmp = *cqq;
	192	for (i = row2x - row1x; --i > 0;)
	193	--cpp = --cqq;
	194	*cqq = tmp;
	195	}
	196	if (scrolled) {
abecab39	197	char p, q;
984263bc MD	198
	199	p = &wwtouched[row2x];
	200	q = p - 1;
	201	for (i = row2x - row1x; --i > 0;)
	202	--p = --q;
	203	*q \|= WWU_TOUCHED;
	204	} else {
abecab39	205	char *p;
984263bc MD	206
	207	p = &wwtouched[row1x];
	208	for (i = row2x - row1x; --i >= 0;)
	209	*p++ \|= WWU_TOUCHED;
	210	}
	211	wwredrawwin1(w, row1 + leaveit, row1x + 1, dir);
	212	wwredrawwin1(w, row2x, row2, dir);
	213	}
	214	} else {
	215	if (scrolled) {
abecab39	216	char *p;
984263bc MD	217
	218	p = &wwtouched[row1x];
	219	for (i = row2x - row1x; --i >= 0;)
	220	*p++ \|= WWU_TOUCHED;
	221	}
	222	out:
	223	if (dir > 0)
	224	wwredrawwin1(w, row1, row2 - leaveit, dir);
	225	else
	226	wwredrawwin1(w, row1 + leaveit, row2, dir);
	227	}
	228	return scrolled;
	229	}