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util.c
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/* $XTermId: util.c,v 1.956 2024/12/01 20:14:26 tom Exp $ */
/*
* Copyright 1999-2023,2024 by Thomas E. Dickey
*
* All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*
*
* Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of Digital Equipment
* Corporation not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
*
* DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* util.c */
#include <xterm.h>
#include <data.h>
#include <error.h>
#include <menu.h>
#include <fontutils.h>
#include <xstrings.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#if OPT_WIDE_CHARS
#if defined(HAVE_WCHAR_H) && defined(HAVE_WCWIDTH)
#include <wchar.h>
#endif
#include <wcwidth.h>
#endif
#ifdef HAVE_X11_EXTENSIONS_XINERAMA_H
#include <X11/extensions/Xinerama.h>
#endif /* HAVE_X11_EXTENSIONS_XINERAMA_H */
#include <graphics.h>
#define IncrementSavedLines(amount) \
if (screen->savedlines < screen->savelines) { \
if ((screen->savedlines += amount) > screen->savelines) \
screen->savedlines = screen->savelines; \
ScrollBarDrawThumb(xw, 1); \
}
static int handle_translated_exposure(XtermWidget xw,
int rect_x,
int rect_y,
int rect_width,
int rect_height);
static void ClearLeft(XtermWidget xw);
static void CopyWait(XtermWidget xw);
static void horizontal_copy_area(XtermWidget xw,
int firstchar,
int nchars,
int amount);
static void vertical_copy_area(XtermWidget xw,
int firstline,
int nlines,
int amount,
int left,
int right);
#if OPT_WIDE_CHARS
unsigned first_widechar;
int (*my_wcwidth) (wchar_t);
#endif
#if OPT_WIDE_CHARS
/*
* We will modify the 'n' cells beginning at the current position.
* Some of those cells may be part of multi-column characters, including
* carryover from the left. Find the limits of the multi-column characters
* that we should fill with blanks, return true if filling is needed.
*/
int
DamagedCells(TScreen *screen, unsigned n, int *klp, int *krp, int row, int col)
{
CLineData *ld = getLineData(screen, row);
int result = False;
assert(ld);
if (col < (int) ld->lineSize) {
int nn = (int) n;
int kl = col;
int kr = col + nn;
if (kr >= (int) ld->lineSize) {
nn = (ld->lineSize - col - 1);
kr = col + nn;
}
if (nn > 0) {
assert(kl < (int) ld->lineSize);
if (ld->charData[kl] == HIDDEN_CHAR) {
while (kl > 0) {
if (ld->charData[--kl] != HIDDEN_CHAR) {
break;
}
}
} else {
kl = col + 1;
}
assert(kr < (int) ld->lineSize);
if (ld->charData[kr] == HIDDEN_CHAR) {
while (kr < screen->max_col) {
assert((kr + 1) < (int) ld->lineSize);
if (ld->charData[++kr] != HIDDEN_CHAR) {
--kr;
break;
}
}
} else {
kr = col - 1;
}
if (klp)
*klp = kl;
if (krp)
*krp = kr;
result = (kr >= kl);
}
}
return result;
}
int
DamagedCurCells(TScreen *screen, unsigned n, int *klp, int *krp)
{
return DamagedCells(screen, n, klp, krp, screen->cur_row, screen->cur_col);
}
#endif /* OPT_WIDE_CHARS */
/*
* These routines are used for the jump scroll feature
*/
void
FlushScroll(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
int i;
int shift = INX2ROW(screen, 0);
int bot = screen->max_row - shift;
int refreshtop;
int refreshheight;
int scrolltop;
int scrollheight;
int left = ScrnLeftMargin(xw);
int right = ScrnRightMargin(xw);
Boolean full_lines = (Boolean) ((left == 0) && (right == screen->max_col));
if (screen->cursor_state)
HideCursor(xw);
TRACE(("FlushScroll %s-lines scroll:%d refresh %d\n",
full_lines ? "full" : "partial",
screen->scroll_amt,
screen->refresh_amt));
if (screen->scroll_amt > 0) {
/*
* Lines will be scrolled "up".
*/
refreshheight = screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg - refreshheight + 1;
refreshtop = screen->bot_marg - refreshheight + 1 + shift;
i = screen->max_row - screen->scroll_amt + 1;
if (refreshtop > i) {
refreshtop = i;
}
/*
* If this is the normal (not alternate) screen, and the top margin is
* at the top of the screen, then we will shift full lines scrolled out
* of the scrolling region into the saved-lines.
*/
if (screen->scrollWidget
&& !screen->whichBuf
&& full_lines
&& screen->top_marg == 0) {
scrolltop = 0;
scrollheight += shift;
if (scrollheight > i)
scrollheight = i;
i = screen->bot_marg - bot;
if (i > 0) {
refreshheight -= i;
if (refreshheight < screen->scroll_amt) {
refreshheight = screen->scroll_amt;
}
}
IncrementSavedLines(screen->scroll_amt);
} else {
scrolltop = screen->top_marg + shift;
i = bot - (screen->bot_marg - screen->refresh_amt + screen->scroll_amt);
if (i > 0) {
if (bot < screen->bot_marg) {
refreshheight = screen->scroll_amt + i;
}
} else {
scrollheight += i;
refreshheight = screen->scroll_amt;
i = screen->top_marg + screen->scroll_amt - 1 - bot;
if (i > 0) {
refreshtop += i;
refreshheight -= i;
}
}
}
} else {
/*
* Lines will be scrolled "down".
*/
refreshheight = -screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg - refreshheight + 1;
refreshtop = screen->top_marg + shift;
scrolltop = refreshtop + refreshheight;
i = screen->bot_marg - bot;
if (i > 0) {
scrollheight -= i;
}
i = screen->top_marg + refreshheight - 1 - bot;
if (i > 0) {
refreshheight -= i;
}
}
vertical_copy_area(xw,
scrolltop + screen->scroll_amt,
scrollheight,
screen->scroll_amt,
left,
right);
ScrollSelection(screen, -(screen->scroll_amt), False);
screen->scroll_amt = 0;
screen->refresh_amt = 0;
if (refreshheight > 0) {
ClearCurBackground(xw,
refreshtop,
left,
(unsigned) refreshheight,
(unsigned) (right + 1 - left),
(unsigned) FontWidth(screen));
ScrnRefresh(xw,
refreshtop,
0,
refreshheight,
MaxCols(screen),
False);
}
xtermTimedDbe(xw);
return;
}
/*
* Returns true if there are lines off-screen due to scrolling which should
* include the current line. If false, the line is visible and we should
* paint it now rather than waiting for the line to become visible.
*/
static Bool
AddToRefresh(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
int amount = screen->refresh_amt;
int row = screen->cur_row;
Bool result;
if (amount == 0) {
result = False;
} else if (amount > 0) {
int bottom;
if (row == (bottom = screen->bot_marg) - amount) {
screen->refresh_amt++;
result = True;
} else {
result = (row >= bottom - amount + 1 && row <= bottom);
}
} else {
int top;
amount = -amount;
if (row == (top = screen->top_marg) + amount) {
screen->refresh_amt--;
result = True;
} else {
result = (row <= top + amount - 1 && row >= top);
}
}
/*
* If this line is visible, and there are scrolled-off lines, flush out
* those which are now visible.
*/
if (!result && screen->scroll_amt)
FlushScroll(xw);
return result;
}
/*
* Returns true if the current row is in the visible area (it should be for
* screen operations) and incidentally flush the scrolled-in lines which
* have newly become visible.
*/
static Bool
AddToVisible(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
Bool result = False;
if (INX2ROW(screen, screen->cur_row) <= LastRowNumber(screen)) {
if (!AddToRefresh(xw)) {
result = True;
}
}
return result;
}
/*
* If we're scrolling, leave the selection intact if possible.
* If it will bump into one of the extremes of the saved-lines, truncate that.
* If the selection is not entirely contained within the margins and not
* entirely outside the margins, clear it.
*/
static void
adjustHiliteOnFwdScroll(XtermWidget xw, int amount, Bool all_lines)
{
TScreen *screen = TScreenOf(xw);
int lo_row = (all_lines
? (screen->bot_marg - screen->savelines)
: screen->top_marg);
int hi_row = screen->bot_marg;
int left = ScrnLeftMargin(xw);
int right = ScrnRightMargin(xw);
TRACE2(("adjustSelection FWD %s by %d (%s)\n",
screen->whichBuf ? "alternate" : "normal",
amount,
all_lines ? "all" : "visible"));
TRACE2((" before highlite %d.%d .. %d.%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col));
TRACE2((" margins %d..%d\n", screen->top_marg, screen->bot_marg));
TRACE2((" limits %d..%d\n", lo_row, hi_row));
if ((left > 0 || right < screen->max_col) &&
((screen->startH.row >= lo_row &&
screen->startH.row - amount <= hi_row) ||
(screen->endH.row >= lo_row &&
screen->endH.row - amount <= hi_row))) {
/*
* This could be improved slightly by excluding the special case where
* the selection is on a single line outside left/right margins.
*/
TRACE2(("deselect because selection overlaps with scrolled partial-line\n"));
ScrnDisownSelection(xw);
} else if (screen->startH.row >= lo_row
&& screen->startH.row - amount < lo_row) {
/* truncate the selection because its start would move out of region */
if (lo_row + amount <= screen->endH.row) {
TRACE2(("truncate selection by changing start %d.%d to %d.%d\n",
screen->startH.row,
screen->startH.col,
lo_row + amount,
0));
screen->startH.row = lo_row + amount;
screen->startH.col = 0;
} else {
TRACE2(("deselect because %d.%d .. %d.%d shifted %d is outside margins %d..%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col,
-amount,
lo_row,
hi_row));
ScrnDisownSelection(xw);
}
} else if (screen->startH.row <= hi_row && screen->endH.row > hi_row) {
TRACE2(("deselect because selection straddles top-margin\n"));
ScrnDisownSelection(xw);
} else if (screen->startH.row < lo_row && screen->endH.row > lo_row) {
TRACE2(("deselect because selection straddles bottom-margin\n"));
ScrnDisownSelection(xw);
}
TRACE2((" after highlite %d.%d .. %d.%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col));
}
/*
* This is the same as adjustHiliteOnFwdScroll(), but reversed. In this case,
* only the visible lines are affected.
*/
static void
adjustHiliteOnBakScroll(XtermWidget xw, int amount)
{
TScreen *screen = TScreenOf(xw);
int lo_row = screen->top_marg;
int hi_row = screen->bot_marg;
TRACE2(("adjustSelection BAK %s by %d (%s)\n",
screen->whichBuf ? "alternate" : "normal",
amount,
"visible"));
TRACE2((" before highlite %d.%d .. %d.%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col));
TRACE2((" margins %d..%d\n", screen->top_marg, screen->bot_marg));
if (screen->endH.row >= hi_row
&& screen->endH.row + amount > hi_row) {
/* truncate the selection because its start would move out of region */
if (hi_row - amount >= screen->startH.row) {
TRACE2(("truncate selection by changing start %d.%d to %d.%d\n",
screen->startH.row,
screen->startH.col,
hi_row - amount,
0));
screen->endH.row = hi_row - amount;
screen->endH.col = 0;
} else {
TRACE2(("deselect because %d.%d .. %d.%d shifted %d is outside margins %d..%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col,
amount,
lo_row,
hi_row));
ScrnDisownSelection(xw);
}
} else if (screen->endH.row >= lo_row && screen->startH.row < lo_row) {
ScrnDisownSelection(xw);
} else if (screen->endH.row > hi_row && screen->startH.row > hi_row) {
ScrnDisownSelection(xw);
}
TRACE2((" after highlite %d.%d .. %d.%d\n",
screen->startH.row,
screen->startH.col,
screen->endH.row,
screen->endH.col));
}
/*
* Move cells in LineData's on the current screen to simulate scrolling by the
* given amount of lines.
*/
static void
scrollInMargins(XtermWidget xw, int amount, int top)
{
TScreen *screen = TScreenOf(xw);
LineData *src;
LineData *dst;
int row;
int left = ScrnLeftMargin(xw);
int right = ScrnRightMargin(xw);
int length = right + 1 - left;
if_OPT_WIDE_CHARS(screen, {
if (amount != 0) {
for (row = top; row <= screen->bot_marg; ++row) {
LineData *ld;
if ((ld = getLineData(screen, row + amount)) != NULL) {
if (left > 0) {
if (ld->charData[left] == HIDDEN_CHAR) {
Clear1Cell(ld, left - 1);
Clear1Cell(ld, left);
}
}
if (right + 1 < (int) ld->lineSize) {
if (ld->charData[right + 1] == HIDDEN_CHAR) {
Clear1Cell(ld, right);
Clear1Cell(ld, right + 1);
}
}
}
}
}
});
if (amount > 0) {
for (row = top; row <= screen->bot_marg - amount; ++row) {
if ((src = getLineData(screen, row + amount)) != NULL
&& (dst = getLineData(screen, row)) != NULL) {
CopyCells(screen, src, dst, left, length, False);
}
}
while (row <= screen->bot_marg) {
ClearCells(xw, 0, (unsigned) length, row, left);
++row;
}
} else if (amount < 0) {
for (row = screen->bot_marg; row >= top - amount; --row) {
if ((src = getLineData(screen, row + amount)) != NULL
&& (dst = getLineData(screen, row)) != NULL) {
CopyCells(screen, src, dst, left, length, True);
}
}
while (row >= top) {
ClearCells(xw, 0, (unsigned) length, row, left);
--row;
}
}
}
#if OPT_WIDE_CHARS
/*
* If we're repainting a section of wide-characters that, e.g., ClearCells has
* repaired when finding double-cell characters, then we should account for
* that in the repaint.
*/
static void
ScrnUpdate2(XtermWidget xw,
int toprow,
int leftcol,
int nrows,
int ncols,
Bool force)
{
if_OPT_WIDE_CHARS(TScreenOf(xw), {
if (leftcol + ncols <= TScreenOf(xw)->max_col)
ncols++;
if (leftcol > 0) {
leftcol--;
ncols++;
}
});
ScrnUpdate(xw, toprow, leftcol, nrows, ncols, force);
}
#else
#define ScrnUpdate2(xw, toprow, leftcol, nrows, ncols, force) \
ScrnUpdate(xw, toprow, leftcol, nrows, ncols, force)
#endif
/*
* scrolls the screen by amount lines, erases bottom, doesn't alter
* cursor position (i.e. cursor moves down amount relative to text).
* All done within the scrolling region, of course.
* requires: amount > 0
*/
void
xtermScroll(XtermWidget xw, int amount)
{
TScreen *screen = TScreenOf(xw);
int i;
int refreshtop = 0;
int refreshheight;
Boolean save_wrap = screen->do_wrap;
int left = ScrnLeftMargin(xw);
int right = ScrnRightMargin(xw);
Boolean scroll_all_lines = (Boolean) (screen->scrollWidget
&& !screen->whichBuf
&& screen->top_marg == 0);
Boolean scroll_full_line = ((left == 0) && (right == screen->max_col));
TRACE(("xtermScroll count=%d (top %d, saved %d)\n", amount,
screen->topline, screen->savelines));
screen->cursor_busy += 1;
screen->cursor_moved = True;
if (screen->cursor_state)
HideCursor(xw);
i = screen->bot_marg - screen->top_marg + 1;
if (amount > i)
amount = i;
if (!scroll_full_line) {
refreshheight = 0;
} else
#if OPT_SCROLL_LOCK
if ((screen->allowScrollLock && screen->scroll_lock)
|| (screen->autoScrollLock && screen->topline < 0)) {
refreshheight = 0;
screen->scroll_amt = 0;
screen->refresh_amt = 0;
if (--(screen->topline) < -screen->savelines) {
screen->topline = -screen->savelines;
screen->scroll_dirty = True;
}
if (++(screen->savedlines) > screen->savelines) {
screen->savedlines = screen->savelines;
}
} else
#endif
{
if (ScrnHaveSelection(screen))
adjustHiliteOnFwdScroll(xw, amount, scroll_all_lines);
if (screen->jumpscroll) {
if (screen->scroll_amt > 0) {
if (!screen->fastscroll) {
if (screen->refresh_amt + amount > i)
FlushScroll(xw);
}
screen->scroll_amt += amount;
screen->refresh_amt += amount;
} else {
if (!screen->fastscroll) {
if (screen->scroll_amt < 0)
FlushScroll(xw);
}
screen->scroll_amt = amount;
screen->refresh_amt = amount;
}
refreshheight = 0;
} else {
int scrolltop;
int scrollheight;
int shift;
int bot;
ScrollSelection(screen, -(amount), False);
if (amount == i) {
ClearScreen(xw);
goto done;
}
shift = INX2ROW(screen, 0);
bot = screen->max_row - shift;
scrollheight = i - amount;
refreshheight = amount;
if ((refreshtop = screen->bot_marg - refreshheight + 1 + shift) >
(i = screen->max_row - refreshheight + 1))
refreshtop = i;
if (scroll_all_lines) {
scrolltop = 0;
if ((scrollheight += shift) > i)
scrollheight = i;
IncrementSavedLines(amount);
} else {
scrolltop = screen->top_marg + shift;
if ((i = screen->bot_marg - bot) > 0) {
scrollheight -= i;
if ((i = screen->top_marg + amount - 1 - bot) >= 0) {
refreshtop += i;
refreshheight -= i;
}
}
}
if (screen->multiscroll && amount == 1 &&
screen->topline == 0 && screen->top_marg == 0 &&
screen->bot_marg == screen->max_row) {
if (screen->incopy < 0 && screen->scrolls == 0)
CopyWait(xw);
screen->scrolls++;
}
vertical_copy_area(xw,
scrolltop + amount,
scrollheight,
amount,
left,
right);
if (refreshheight > 0) {
ClearCurBackground(xw,
refreshtop,
left,
(unsigned) refreshheight,
(unsigned) (right + 1 - left),
(unsigned) FontWidth(screen));
if (refreshheight > shift)
refreshheight = shift;
}
}
}
if (amount > 0) {
if (left > 0 || right < screen->max_col) {
scrollInMargins(xw, amount, screen->top_marg);
ScrnUpdate2(xw,
screen->top_marg,
left,
screen->bot_marg + 1 - screen->top_marg,
right + 1 - left,
True);
} else if (scroll_all_lines) {
ScrnDeleteLine(xw,
screen->saveBuf_index,
screen->bot_marg + screen->savelines,
0,
(unsigned) amount);
} else {
ScrnDeleteLine(xw,
screen->visbuf,
screen->bot_marg,
screen->top_marg,
(unsigned) amount);
}
}
scroll_displayed_graphics(xw, amount);
if (refreshheight > 0) {
ScrnRefresh(xw,
refreshtop,
left,
refreshheight,
right + 1 - left,
False);
}
done:
screen->do_wrap = save_wrap;
screen->cursor_busy -= 1;
TRACE(("...xtermScroll count=%d (top %d, saved %d)\n", amount,
screen->topline, screen->savelines));
return;
}
/*
* This is from ISO 6429, not found in any of DEC's terminals.
*/
void
xtermScrollLR(XtermWidget xw, int amount, Bool toLeft)
{
if (amount > 0) {
xtermColScroll(xw, amount, toLeft, ScrnLeftMargin(xw));
}
}
/*
* Implement DECBI/DECFI (back/forward column index)
*/
void
xtermColIndex(XtermWidget xw, Bool toLeft)
{
TScreen *screen = TScreenOf(xw);
if (toLeft) {
if (ScrnIsColInMargins(screen, screen->cur_col)) {
if (screen->cur_col == ScrnLeftMargin(xw)) {
xtermColScroll(xw, 1, False, screen->cur_col);
} else {
CursorBack(xw, 1);
}
} else {
CursorBack(xw, 1);
}
} else {
if (ScrnIsColInMargins(screen, screen->cur_col)) {
if (screen->cur_col == ScrnRightMargin(xw)) {
xtermColScroll(xw, 1, True, ScrnLeftMargin(xw));
} else {
CursorForward(xw, 1);
}
} else {
CursorForward(xw, 1);
}
}
}
/*
* Implement DECDC/DECIC (delete/insert column)
*/
void
xtermColScroll(XtermWidget xw, int amount, Bool toLeft, int at_col)
{
TScreen *screen = TScreenOf(xw);
if (amount > 0) {
int min_row;
int max_row;
if (ScrnHaveRowMargins(screen)) {
min_row = screen->top_marg;
max_row = screen->bot_marg;
} else {
min_row = 0;
max_row = screen->max_row;
}
if (screen->cur_row >= min_row
&& screen->cur_row <= max_row
&& screen->cur_col >= screen->lft_marg
&& screen->cur_col <= screen->rgt_marg) {
int save_row = screen->cur_row;
int save_col = screen->cur_col;
int row;
screen->cur_col = at_col;
if (toLeft) {
for (row = min_row; row <= max_row; row++) {
screen->cur_row = row;
ScrnDeleteChar(xw, (unsigned) amount);
}
} else {
for (row = min_row; row <= max_row; row++) {
screen->cur_row = row;
ScrnInsertChar(xw, (unsigned) amount);
}
}
screen->cur_row = save_row;
screen->cur_col = save_col;
xtermRepaint(xw);
}
}
}
/*
* Reverse scrolls the screen by amount lines, erases top, doesn't alter
* cursor position (i.e. cursor moves up amount relative to text).
* All done within the scrolling region, of course.
* Requires: amount > 0
*/
void
RevScroll(XtermWidget xw, int amount)
{
TScreen *screen = TScreenOf(xw);
int i = screen->bot_marg - screen->top_marg + 1;
int left = ScrnLeftMargin(xw);
int right = ScrnRightMargin(xw);
Boolean scroll_full_line = ((left == 0) && (right == screen->max_col));
TRACE(("RevScroll count=%d\n", amount));
screen->cursor_busy += 1;
screen->cursor_moved = True;
if (screen->cursor_state)
HideCursor(xw);
if (amount > i)
amount = i;
if (ScrnHaveSelection(screen))
adjustHiliteOnBakScroll(xw, amount);
if (!scroll_full_line) {
;
} else if (screen->jumpscroll) {
if (screen->scroll_amt < 0) {
if (-screen->refresh_amt + amount > i)
FlushScroll(xw);
screen->scroll_amt -= amount;
screen->refresh_amt -= amount;
} else {
if (screen->scroll_amt > 0)
FlushScroll(xw);
screen->scroll_amt = -amount;
screen->refresh_amt = -amount;
}
} else {
int shift = INX2ROW(screen, 0);
int bot = screen->max_row - shift;
int refreshheight = amount;
int refreshtop = screen->top_marg + shift;
int scrollheight = (screen->bot_marg
- screen->top_marg - refreshheight + 1);
int scrolltop = refreshtop + refreshheight;
if ((i = screen->bot_marg - bot) > 0)
scrollheight -= i;
if ((i = screen->top_marg + refreshheight - 1 - bot) > 0)
refreshheight -= i;
if (screen->multiscroll && amount == 1 &&
screen->topline == 0 && screen->top_marg == 0 &&
screen->bot_marg == screen->max_row) {
if (screen->incopy < 0 && screen->scrolls == 0)
CopyWait(xw);
screen->scrolls++;
}
vertical_copy_area(xw,
scrolltop - amount,
scrollheight,
-amount,
left,
right);
if (refreshheight > 0) {
ClearCurBackground(xw,
refreshtop,
left,
(unsigned) refreshheight,
(unsigned) (right + 1 - left),
(unsigned) FontWidth(screen));
}
}
if (amount > 0) {
if (left > 0 || right < screen->max_col) {
scrollInMargins(xw, -amount, screen->top_marg);
ScrnUpdate2(xw,
screen->top_marg,
left,
screen->bot_marg + 1 - screen->top_marg,
right + 1 - left,
True);
} else {
ScrnInsertLine(xw,
screen->visbuf,
screen->bot_marg,
screen->top_marg,
(unsigned) amount);
}
}
screen->cursor_busy -= 1;
return;
}
#if OPT_ZICONBEEP
void
initZIconBeep(void)
{
if (resource.zIconBeep > 100 || resource.zIconBeep < -100) {
resource.zIconBeep = 0; /* was 100, but I prefer to defaulting off. */
xtermWarning("a number between -100 and 100 is required for zIconBeep. 0 used by default\n");
}
}
static char *
getIconName(void)
{
static char *icon_name;
static Arg args[] =
{
{XtNiconName, (XtArgVal) & icon_name}
};
icon_name = NULL;
XtGetValues(toplevel, args, XtNumber(args));
return icon_name;
}
static void
setZIconBeep(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
/* Flag icon name with "***" on window output when iconified.
*/
if (resource.zIconBeep && mapstate == IsUnmapped && !screen->zIconBeep_flagged) {
char *icon_name = getIconName();
if (icon_name != NULL) {
screen->zIconBeep_flagged = True;
ChangeIconName(xw, icon_name);
}