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util.c
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/*
* $XConsortium: util.c /main/33 1996/12/01 23:47:10 swick $
* $XFree86: xc/programs/xterm/util.c,v 3.51 2000/02/29 03:09:30 dawes Exp $
*/
/*
* Copyright 1999-2000 by Thomas E. Dickey <dickey@clark.net>
*
* 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 <stdio.h>
#include <ctype.h>
extern Bool waiting_for_initial_map;
static int ClearInLine (TScreen *screen, int row, int col, int len);
static int handle_translated_exposure (TScreen *screen, int rect_x, int rect_y, unsigned int rect_width, unsigned int rect_height);
static void ClearLeft (TScreen *screen);
static void CopyWait (TScreen *screen);
static void horizontal_copy_area (TScreen *screen, int firstchar, int nchars, int amount);
static void vertical_copy_area (TScreen *screen, int firstline, int nlines, int amount);
/*
* These routines are used for the jump scroll feature
*/
void
FlushScroll(register TScreen *screen)
{
register int i;
register int shift = -screen->topline;
register int bot = screen->max_row - shift;
register int refreshtop;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if(screen->cursor_state)
HideCursor();
if(screen->scroll_amt > 0) {
refreshheight = screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg -
refreshheight + 1;
if((refreshtop = screen->bot_marg - refreshheight + 1 + shift) >
(i = screen->max_row - screen->scroll_amt + 1))
refreshtop = i;
if(screen->scrollWidget && !screen->alternate
&& screen->top_marg == 0) {
scrolltop = 0;
if((scrollheight += shift) > i)
scrollheight = i;
if((i = screen->bot_marg - bot) > 0 &&
(refreshheight -= i) < screen->scroll_amt)
refreshheight = screen->scroll_amt;
if((i = screen->savedlines) < screen->savelines) {
if((i += screen->scroll_amt) >
screen->savelines)
i = screen->savelines;
screen->savedlines = i;
ScrollBarDrawThumb(screen->scrollWidget);
}
} else {
scrolltop = screen->top_marg + shift;
if((i = bot - (screen->bot_marg - screen->refresh_amt +
screen->scroll_amt)) > 0) {
if(bot < screen->bot_marg)
refreshheight = screen->scroll_amt + i;
} else {
scrollheight += i;
refreshheight = screen->scroll_amt;
if((i = screen->top_marg + screen->scroll_amt -
1 - bot) > 0) {
refreshtop += i;
refreshheight -= i;
}
}
}
} else {
refreshheight = -screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg -
refreshheight + 1;
refreshtop = screen->top_marg + shift;
scrolltop = refreshtop + refreshheight;
if((i = screen->bot_marg - bot) > 0)
scrollheight -= i;
if((i = screen->top_marg + refreshheight - 1 - bot) > 0)
refreshheight -= i;
}
scrolling_copy_area(screen, scrolltop+screen->scroll_amt,
scrollheight, screen->scroll_amt);
ScrollSelection(screen, -(screen->scroll_amt));
screen->scroll_amt = 0;
screen->refresh_amt = 0;
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
ScrnRefresh(screen, refreshtop, 0, refreshheight,
screen->max_col + 1, False);
}
}
int
AddToRefresh(register TScreen *screen)
{
register int amount = screen->refresh_amt;
register int row = screen->cur_row;
if(amount == 0)
return(0);
if(amount > 0) {
register int bottom;
if(row == (bottom = screen->bot_marg) - amount) {
screen->refresh_amt++;
return(1);
}
return(row >= bottom - amount + 1 && row <= bottom);
} else {
register int top;
amount = -amount;
if(row == (top = screen->top_marg) + amount) {
screen->refresh_amt--;
return(1);
}
return(row <= top + amount - 1 && row >= top);
}
}
/*
* 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(register TScreen *screen, register int amount)
{
register int i = screen->bot_marg - screen->top_marg + 1;
register int shift;
register int bot;
register int refreshtop = 0;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if(screen->cursor_state)
HideCursor();
if (amount > i)
amount = i;
if(screen->jumpscroll) {
if(screen->scroll_amt > 0) {
if(screen->refresh_amt + amount > i)
FlushScroll(screen);
screen->scroll_amt += amount;
screen->refresh_amt += amount;
} else {
if(screen->scroll_amt < 0)
FlushScroll(screen);
screen->scroll_amt = amount;
screen->refresh_amt = amount;
}
refreshheight = 0;
} else {
ScrollSelection(screen, -(amount));
if (amount == i) {
ClearScreen(screen);
return;
}
shift = -screen->topline;
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(screen->scrollWidget && !screen->alternate
&& screen->top_marg == 0) {
scrolltop = 0;
if((scrollheight += shift) > i)
scrollheight = i;
if((i = screen->savedlines) < screen->savelines) {
if((i += amount) > screen->savelines)
i = screen->savelines;
screen->savedlines = i;
ScrollBarDrawThumb(screen->scrollWidget);
}
} 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(screen);
screen->scrolls++;
}
scrolling_copy_area(screen, scrolltop+amount, scrollheight, amount);
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
if(refreshheight > shift)
refreshheight = shift;
}
}
if(screen->scrollWidget && !screen->alternate && screen->top_marg == 0)
ScrnDeleteLine(screen, screen->allbuf,
screen->bot_marg + screen->savelines, 0,
amount, screen->max_col + 1);
else
ScrnDeleteLine(screen, screen->visbuf,
screen->bot_marg, screen->top_marg,
amount, screen->max_col + 1);
if(refreshheight > 0)
ScrnRefresh(screen, refreshtop, 0, refreshheight,
screen->max_col + 1, False);
}
/*
* 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(register TScreen *screen, register int amount)
{
register int i = screen->bot_marg - screen->top_marg + 1;
register int shift;
register int bot;
register int refreshtop;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if(screen->cursor_state)
HideCursor();
if (amount > i)
amount = i;
if(screen->jumpscroll) {
if(screen->scroll_amt < 0) {
if(-screen->refresh_amt + amount > i)
FlushScroll(screen);
screen->scroll_amt -= amount;
screen->refresh_amt -= amount;
} else {
if(screen->scroll_amt > 0)
FlushScroll(screen);
screen->scroll_amt = -amount;
screen->refresh_amt = -amount;
}
} else {
shift = -screen->topline;
bot = screen->max_row - shift;
refreshheight = amount;
scrollheight = screen->bot_marg - screen->top_marg -
refreshheight + 1;
refreshtop = screen->top_marg + shift;
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(screen);
screen->scrolls++;
}
scrolling_copy_area(screen, scrolltop-amount, scrollheight, -amount);
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
}
}
ScrnInsertLine(screen, screen->visbuf, screen->bot_marg, screen->top_marg,
amount, screen->max_col + 1);
}
/*
* If cursor not in scrolling region, returns. Else,
* inserts n blank lines at the cursor's position. Lines above the
* bottom margin are lost.
*/
void
InsertLine (register TScreen *screen, register int n)
{
register int i;
register int shift;
register int bot;
register int refreshtop;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if (screen->cur_row < screen->top_marg ||
screen->cur_row > screen->bot_marg)
return;
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if (n > (i = screen->bot_marg - screen->cur_row + 1))
n = i;
if(screen->jumpscroll) {
if(screen->scroll_amt <= 0 &&
screen->cur_row <= -screen->refresh_amt) {
if(-screen->refresh_amt + n > screen->max_row + 1)
FlushScroll(screen);
screen->scroll_amt -= n;
screen->refresh_amt -= n;
} else if(screen->scroll_amt)
FlushScroll(screen);
}
if(!screen->scroll_amt) {
shift = -screen->topline;
bot = screen->max_row - shift;
refreshheight = n;
scrollheight = screen->bot_marg - screen->cur_row - refreshheight + 1;
refreshtop = screen->cur_row + shift;
scrolltop = refreshtop + refreshheight;
if((i = screen->bot_marg - bot) > 0)
scrollheight -= i;
if((i = screen->cur_row + refreshheight - 1 - bot) > 0)
refreshheight -= i;
vertical_copy_area(screen, scrolltop-n, scrollheight, -n);
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
}
}
ScrnInsertLine(screen, screen->visbuf, screen->bot_marg, screen->cur_row, n,
screen->max_col + 1);
}
/*
* If cursor not in scrolling region, returns. Else, deletes n lines
* at the cursor's position, lines added at bottom margin are blank.
*/
void
DeleteLine(register TScreen *screen, register int n)
{
register int i;
register int shift;
register int bot;
register int refreshtop;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if (screen->cur_row < screen->top_marg ||
screen->cur_row > screen->bot_marg)
return;
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if (n > (i = screen->bot_marg - screen->cur_row + 1))
n = i;
if(screen->jumpscroll) {
if(screen->scroll_amt >= 0 && screen->cur_row == screen->top_marg) {
if(screen->refresh_amt + n > screen->max_row + 1)
FlushScroll(screen);
screen->scroll_amt += n;
screen->refresh_amt += n;
} else if(screen->scroll_amt)
FlushScroll(screen);
}
if(!screen->scroll_amt) {
shift = -screen->topline;
bot = screen->max_row - shift;
scrollheight = i - n;
refreshheight = n;
if((refreshtop = screen->bot_marg - refreshheight + 1 + shift) >
(i = screen->max_row - refreshheight + 1))
refreshtop = i;
if(screen->scrollWidget && !screen->alternate && screen->cur_row == 0) {
scrolltop = 0;
if((scrollheight += shift) > i)
scrollheight = i;
if((i = screen->savedlines) < screen->savelines) {
if((i += n) > screen->savelines)
i = screen->savelines;
screen->savedlines = i;
ScrollBarDrawThumb(screen->scrollWidget);
}
} else {
scrolltop = screen->cur_row + shift;
if((i = screen->bot_marg - bot) > 0) {
scrollheight -= i;
if((i = screen->cur_row + n - 1 - bot) >= 0) {
refreshheight -= i;
}
}
}
vertical_copy_area(screen, scrolltop+n, scrollheight, n);
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
}
}
/* adjust screen->buf */
if(screen->scrollWidget && !screen->alternate && screen->cur_row == 0)
ScrnDeleteLine(screen, screen->allbuf,
screen->bot_marg + screen->savelines, 0,
n, screen->max_col + 1);
else
ScrnDeleteLine(screen, screen->visbuf,
screen->bot_marg, screen->cur_row,
n, screen->max_col + 1);
}
/*
* Insert n blanks at the cursor's position, no wraparound
*/
void
InsertChar (register TScreen *screen, register int n)
{
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if(screen->cur_row - screen->topline <= screen->max_row) {
if(!AddToRefresh(screen)) {
int col = screen->max_col + 1 - n;
if(screen->scroll_amt)
FlushScroll(screen);
#if OPT_DEC_CHRSET
if (CSET_DOUBLE(SCRN_BUF_CSETS(screen, screen->cur_row)[0])) {
col = (screen->max_col + 1) / 2 - n;
}
#endif
/*
* prevent InsertChar from shifting the end of a line over
* if it is being appended to
*/
if (non_blank_line (screen->visbuf, screen->cur_row,
screen->cur_col, screen->max_col + 1))
horizontal_copy_area(screen, screen->cur_col,
col - screen->cur_col,
n);
ClearCurBackground(
screen,
CursorY (screen, screen->cur_row),
CurCursorX (screen, screen->cur_row, screen->cur_col),
FontHeight(screen),
n * CurFontWidth(screen,screen->cur_row));
}
}
/* adjust screen->buf */
ScrnInsertChar(screen, n, screen->max_col + 1);
}
/*
* Deletes n chars at the cursor's position, no wraparound.
*/
void
DeleteChar (register TScreen *screen, register int n)
{
register int width;
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if (n > (width = screen->max_col + 1 - screen->cur_col))
n = width;
if(screen->cur_row - screen->topline <= screen->max_row) {
if(!AddToRefresh(screen)) {
int col = screen->max_col + 1 - n;
if(screen->scroll_amt)
FlushScroll(screen);
#if OPT_DEC_CHRSET
if (CSET_DOUBLE(SCRN_BUF_CSETS(screen, screen->cur_row)[0])) {
col = (screen->max_col + 1) / 2 - n;
}
#endif
horizontal_copy_area(screen, screen->cur_col+n,
col - screen->cur_col,
-n);
ClearCurBackground (
screen,
CursorY (screen, screen->cur_row),
CurCursorX(screen, screen->cur_row, col),
FontHeight(screen),
n * CurFontWidth(screen,screen->cur_row));
}
}
/* adjust screen->buf */
ScrnDeleteChar (screen, n, screen->max_col + 1);
}
/*
* Clear from cursor position to beginning of display, inclusive.
*/
static void
ClearAbove (register TScreen *screen)
{
if (screen->protected_mode != OFF_PROTECT) {
register int row;
for (row = 0; row <= screen->max_row; row++)
ClearInLine(screen, row, 0, screen->max_col + 1);
} else {
register int top, height;
if(screen->cursor_state)
HideCursor();
if((top = -screen->topline) <= screen->max_row) {
if(screen->scroll_amt)
FlushScroll(screen);
if((height = screen->cur_row + top) > screen->max_row)
height = screen->max_row;
if((height -= top) > 0) {
ClearCurBackground(screen,
top * FontHeight(screen) + screen->border,
OriginX(screen),
height * FontHeight(screen),
Width(screen));
}
}
ClearBufRows(screen, 0, screen->cur_row - 1);
}
if(screen->cur_row - screen->topline <= screen->max_row)
ClearLeft(screen);
}
/*
* Clear from cursor position to end of display, inclusive.
*/
static void
ClearBelow (register TScreen *screen)
{
ClearRight(screen, -1);
if (screen->protected_mode != OFF_PROTECT) {
register int row;
for (row = screen->cur_row + 1; row <= screen->max_row; row++)
ClearInLine(screen, row, 0, screen->max_col + 1);
} else {
register int top;
if((top = screen->cur_row - screen->topline) <= screen->max_row) {
if(screen->scroll_amt)
FlushScroll(screen);
if(++top <= screen->max_row) {
ClearCurBackground(screen,
top * FontHeight(screen) + screen->border,
OriginX(screen),
(screen->max_row - top + 1) * FontHeight(screen),
Width(screen));
}
}
ClearBufRows(screen, screen->cur_row + 1, screen->max_row);
}
}
/*
* Clear the given row, for the given range of columns, returning 1 if no
* protected characters were found, 0 otherwise.
*/
static int
ClearInLine(register TScreen *screen, int row, int col, int len)
{
int rc = 1;
int flags = TERM_COLOR_FLAGS;
/*
* If we're clearing to the end of the line, we won't count this as
* "drawn" characters. We'll only do cut/paste on "drawn" characters,
* so this has the effect of suppressing trailing blanks from a
* selection.
*/
if (col + len + 1 < screen->max_col)
flags |= CHARDRAWN;
/* If we've marked protected text on the screen, we'll have to
* check each time we do an erase.
*/
if (screen->protected_mode != OFF_PROTECT) {
register int n;
Char *attrs = SCRN_BUF_ATTRS(screen, row) + col;
int saved_mode = screen->protected_mode;
Bool done;
/* disable this branch during recursion */
screen->protected_mode = OFF_PROTECT;
do {
done = True;
for (n = 0; n < len; n++) {
if (attrs[n] & PROTECTED) {
rc = 0; /* found a protected segment */
if (n != 0)
ClearInLine(screen, row, col, n);
while ((n < len)
&& (attrs[n] & PROTECTED))
n++;
done = False;
break;
}
}
/* setup for another segment, past the protected text */
if (!done) {
attrs += n;
col += n;
len -= n;
}
} while (!done);
screen->protected_mode = saved_mode;
if (len <= 0)
return 0;
}
/* fall through to the final non-protected segment */
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if (row - screen->topline <= screen->max_row) {
if(!AddToRefresh(screen)) {
if(screen->scroll_amt)
FlushScroll(screen);
ClearCurBackground (
screen,
CursorY (screen, row),
CurCursorX (screen, row, col),
FontHeight(screen),
len * CurFontWidth(screen,row));
}
}
memset(SCRN_BUF_CHARS(screen, row) + col, ' ', len);
memset(SCRN_BUF_ATTRS(screen, row) + col, flags, len);
if_OPT_EXT_COLORS(screen,{
memset(SCRN_BUF_FGRND(screen, row) + col, term->sgr_foreground, len);
memset(SCRN_BUF_BGRND(screen, row) + col, term->cur_background, len);
})
if_OPT_ISO_TRADITIONAL_COLORS(screen,{
memset(SCRN_BUF_COLOR(screen, row) + col, xtermColorPair(), len);
})
if_OPT_DEC_CHRSET({
memset(SCRN_BUF_CSETS(screen, row) + col, curXtermChrSet(screen->cur_row), len);
})
if_OPT_WIDE_CHARS(screen,{
memset(SCRN_BUF_WIDEC(screen, row) + col, 0, len);
})
return rc;
}
/*
* Clear the next n characters on the cursor's line, including the cursor's
* position.
*/
void
ClearRight (register TScreen *screen, int n)
{
int len = (screen->max_col - screen->cur_col + 1);
if (n < 0) /* the remainder of the line */
n = screen->max_col + 1;
if (n == 0) /* default for 'ECH' */
n = 1;
if (len > n)
len = n;
(void) ClearInLine(screen, screen->cur_row, screen->cur_col, len);
/* with the right part cleared, we can't be wrapping */
ScrnClrWrapped(screen, screen->cur_row);
}
/*
* Clear first part of cursor's line, inclusive.
*/
static void
ClearLeft (register TScreen *screen)
{
(void) ClearInLine(screen, screen->cur_row, 0, screen->cur_col + 1);
}
/*
* Erase the cursor's line.
*/
static void
ClearLine(register TScreen *screen)
{
(void) ClearInLine(screen, screen->cur_row, 0, screen->max_col + 1);
}
void
ClearScreen(register TScreen *screen)
{
register int top;
if(screen->cursor_state)
HideCursor();
screen->do_wrap = 0;
if((top = -screen->topline) <= screen->max_row) {
if(screen->scroll_amt)
FlushScroll(screen);
ClearCurBackground(screen,
top * FontHeight(screen) + screen->border,
OriginX(screen),
(screen->max_row - top + 1) * FontHeight(screen),
Width(screen));
}
ClearBufRows (screen, 0, screen->max_row);
}
/*
* If we've written protected text DEC-style, and are issuing a non-DEC
* erase, temporarily reset the protected_mode flag so that the erase will
* ignore the protected flags.
*/
void
do_erase_line(
register TScreen *screen,
int param,
int mode)
{
int saved_mode = screen->protected_mode;
if (saved_mode == DEC_PROTECT
&& saved_mode != mode)
screen->protected_mode = OFF_PROTECT;
switch (param) {
case -1: /* DEFAULT */
case 0:
ClearRight(screen, -1);
break;
case 1:
ClearLeft(screen);
break;
case 2:
ClearLine(screen);
break;
}
screen->protected_mode = saved_mode;
}
/*
* Just like 'do_erase_line()', except that this intercepts ED controls. If we
* clear the whole screen, we'll get the return-value from ClearInLine, and
* find if there were any protected characters left. If not, reset the
* protected mode flag in the screen data (it's slower).
*/
void
do_erase_display(
register TScreen *screen,
int param,
int mode)
{
int saved_mode = screen->protected_mode;
if (saved_mode == DEC_PROTECT
&& saved_mode != mode)
screen->protected_mode = OFF_PROTECT;
switch (param) {
case -1: /* DEFAULT */
case 0:
if (screen->cur_row == 0
&& screen->cur_col == 0) {
screen->protected_mode = saved_mode;
do_erase_display(screen, 2, mode);
saved_mode = screen->protected_mode;
} else
ClearBelow(screen);
break;
case 1:
if (screen->cur_row == screen->max_row
&& screen->cur_col == screen->max_col) {
screen->protected_mode = saved_mode;
do_erase_display(screen, 2, mode);
saved_mode = screen->protected_mode;
} else
ClearAbove(screen);
break;
case 2:
/*
* We use 'ClearScreen()' throughout the remainder of the
* program for places where we don't care if the characters are
* protected or not. So we modify the logic around this call
* on 'ClearScreen()' to handle protected characters.
*/
if (screen->protected_mode != OFF_PROTECT) {
register int row;
int rc = 1;
for (row = 0; row <= screen->max_row; row++)
rc &= ClearInLine(screen, row, 0, screen->max_col + 1);
if (rc != 0)
saved_mode = OFF_PROTECT;
} else {
ClearScreen(screen);
}
break;
case 3:
/* xterm addition - erase saved lines. */
screen->savedlines = 0;
ScrollBarDrawThumb( screen->scrollWidget );
break;
}
screen->protected_mode = saved_mode;
}
static void
CopyWait(register TScreen *screen)
{
XEvent reply;
XEvent *rep = &reply;
while (1) {
XWindowEvent (screen->display, VWindow(screen),
ExposureMask, &reply);
switch (reply.type) {
case Expose:
HandleExposure (screen, &reply);
break;
case NoExpose:
case GraphicsExpose:
if (screen->incopy <= 0) {
screen->incopy = 1;
if (screen->scrolls > 0)
screen->scrolls--;
}
if (reply.type == GraphicsExpose)
HandleExposure (screen, &reply);
if ((reply.type == NoExpose) ||
((XExposeEvent *)rep)->count == 0) {
if (screen->incopy <= 0 && screen->scrolls > 0)
screen->scrolls--;
if (screen->scrolls == 0) {
screen->incopy = 0;
return;
}
screen->incopy = -1;
}
break;
}
}
}
/*
* used by vertical_copy_area and and horizontal_copy_area
*/
static void
copy_area(
TScreen *screen,
int src_x,
int src_y,
unsigned int width,
unsigned int height,
int dest_x,
int dest_y)
{
/* wait for previous CopyArea to complete unless
multiscroll is enabled and active */
if (screen->incopy && screen->scrolls == 0)
CopyWait(screen);
screen->incopy = -1;
/* save for translating Expose events */
screen->copy_src_x = src_x;
screen->copy_src_y = src_y;
screen->copy_width = width;
screen->copy_height = height;
screen->copy_dest_x = dest_x;
screen->copy_dest_y = dest_y;
XCopyArea(screen->display,
VWindow(screen), VWindow(screen),
NormalGC(screen),
src_x, src_y, width, height, dest_x, dest_y);
}
/*
* use when inserting or deleting characters on the current line
*/
static void
horizontal_copy_area(
TScreen *screen,
int firstchar, /* char pos on screen to start copying at */
int nchars,
int amount) /* number of characters to move right */
{
int src_x = CurCursorX(screen, screen->cur_row, firstchar);
int src_y = CursorY(screen, screen->cur_row);
copy_area(screen, src_x, src_y,
(unsigned)nchars * CurFontWidth(screen,screen->cur_row),
FontHeight(screen),
src_x + amount*CurFontWidth(screen,screen->cur_row), src_y);
}
/*
* use when inserting or deleting lines from the screen
*/
static void
vertical_copy_area(
TScreen *screen,
int firstline, /* line on screen to start copying at */
int nlines,
int amount) /* number of lines to move up (neg=down) */
{
if(nlines > 0) {
int src_x = OriginX(screen);
int src_y = firstline * FontHeight(screen) + screen->border;