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screen.C
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screen.C
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/*---------------------------------------------------------------------------*
* File: screen.C
*---------------------------------------------------------------------------*
*
* Copyright (c) 1997-2001 Geoff Wing <gcw@pobox.com>
* Copyright (c) 2003-2007 Marc Lehmann <schmorp@schmorp.de>
* Copyright (c) 2015 Emanuele Giaquinta <e.giaquinta@glauco.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*--------------------------------------------------------------------------*/
/*
* This file handles _all_ screen updates and selections
*/
#include "../config.h" /* NECESSARY */
#include "rxvt.h" /* NECESSARY */
#include "rxvtperl.h" /* NECESSARY */
#include <inttypes.h>
static inline void
fill_text (text_t *start, text_t value, int len)
{
while (len--)
*start++ = value;
}
/* ------------------------------------------------------------------------- */
#define TABSIZE 8 /* default tab size */
/* ------------------------------------------------------------------------- *
* GENERAL SCREEN AND SELECTION UPDATE ROUTINES *
* ------------------------------------------------------------------------- */
#define ZERO_SCROLLBACK() \
if (option (Opt_scrollTtyOutput)) \
view_start = 0
#define CLEAR_SELECTION() \
selection.beg.row = selection.beg.col \
= selection.end.row = selection.end.col = 0
#define CLEAR_ALL_SELECTION() \
selection.beg.row = selection.beg.col \
= selection.mark.row = selection.mark.col \
= selection.end.row = selection.end.col = 0
#define ROW_AND_COL_IS_AFTER(A, B, C, D) \
(((A) > (C)) || (((A) == (C)) && ((B) > (D))))
#define ROW_AND_COL_IS_BEFORE(A, B, C, D) \
(((A) < (C)) || (((A) == (C)) && ((B) < (D))))
#define ROW_AND_COL_IN_ROW_AFTER(A, B, C, D) \
(((A) == (C)) && ((B) > (D)))
#define ROW_AND_COL_IN_ROW_AT_OR_AFTER(A, B, C, D) \
(((A) == (C)) && ((B) >= (D)))
#define ROW_AND_COL_IN_ROW_BEFORE(A, B, C, D) \
(((A) == (C)) && ((B) < (D)))
#define ROW_AND_COL_IN_ROW_AT_OR_BEFORE(A, B, C, D) \
(((A) == (C)) && ((B) <= (D)))
/* these must be row_col_t */
#define ROWCOL_IS_AFTER(X, Y) \
ROW_AND_COL_IS_AFTER ((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IS_BEFORE(X, Y) \
ROW_AND_COL_IS_BEFORE ((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AFTER(X, Y) \
ROW_AND_COL_IN_ROW_AFTER ((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_BEFORE(X, Y) \
ROW_AND_COL_IN_ROW_BEFORE ((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AT_OR_AFTER(X, Y) \
ROW_AND_COL_IN_ROW_AT_OR_AFTER ((X).row, (X).col, (Y).row, (Y).col)
#define ROWCOL_IN_ROW_AT_OR_BEFORE(X, Y) \
ROW_AND_COL_IN_ROW_AT_OR_BEFORE ((X).row, (X).col, (Y).row, (Y).col)
/*
* CLEAR_CHARS: clear <num> chars starting from pixel position <x,y>
*/
#define CLEAR_CHARS(x, y, num) \
if (mapped) \
XClearArea (dpy, vt, x, y, \
(unsigned int)Width2Pixel (num), \
(unsigned int)Height2Pixel (1), False)
/* ------------------------------------------------------------------------- *
* SCREEN `COMMON' ROUTINES *
* ------------------------------------------------------------------------- */
/* Fill part/all of a line with blanks. */
void
rxvt_term::scr_blank_line (line_t &l, unsigned int col, unsigned int width, rend_t efs) const NOTHROW
{
if (!l.valid ())
{
l.alloc ();
col = 0;
width = ncol;
}
l.touch ();
efs &= ~RS_baseattrMask; // remove italic etc. fontstyles
efs = SET_FONT (efs, FONTSET (efs)->find_font (' '));
text_t *et = l.t + col;
rend_t *er = l.r + col;
while (width--)
{
*et++ = ' ';
*er++ = efs;
}
}
/* ------------------------------------------------------------------------- */
/* Fill a full line with blanks - make sure it is allocated first */
void
rxvt_term::scr_blank_screen_mem (line_t &l, rend_t efs) const NOTHROW
{
scr_blank_line (l, 0, ncol, efs);
l.l = 0;
l.f = 0;
}
// nuke a single wide character at the given column
void
rxvt_term::scr_kill_char (line_t &l, int col) const NOTHROW
{
// find begin
while (col > 0 && l.t[col] == NOCHAR)
col--;
rend_t rend = l.r[col] & ~RS_baseattrMask;
rend = SET_FONT (rend, FONTSET (rend)->find_font (' '));
l.touch ();
// found start, nuke
do {
l.t[col] = ' ';
l.r[col] = rend;
col++;
} while (col < ncol && l.t[col] == NOCHAR);
}
// set the rendition of a single wide character beginning at the given column
void
rxvt_term::scr_set_char_rend (line_t &l, int col, rend_t rend)
{
do {
l.r[col] = rend;
col++;
} while (col < ncol && l.t[col] == NOCHAR);
}
/* ------------------------------------------------------------------------- *
* SCREEN INITIALISATION *
* ------------------------------------------------------------------------- */
void
rxvt_term::scr_alloc () NOTHROW
{
int tsize = sizeof (text_t) * ncol;
int rsize = sizeof (rend_t) * ncol;
// we assume that rend_t size is a sufficient alignment
// factor for text_t and line_t values, and we only
// need to adjust tsize.
tsize = (tsize + sizeof (rend_t) - 1);
tsize -= tsize % sizeof (rend_t);
int all_rows = total_rows + nrow + nrow;
chunk_size = (sizeof (line_t) + rsize + tsize) * all_rows;
chunk = chunk_alloc (chunk_size, 0);
char *base = (char *)chunk + sizeof (line_t) * all_rows;
for (int row = 0; row < all_rows; ++row)
{
line_t &l = ((line_t *)chunk) [row];
l.t = (text_t *)base; base += tsize;
l.r = (rend_t *)base; base += rsize;
l.l = -1;
l.f = 0;
}
drawn_buf = (line_t *)chunk;
swap_buf = drawn_buf + nrow;
row_buf = swap_buf + nrow;
}
void
rxvt_term::copy_line (line_t &dst, line_t &src)
{
scr_blank_screen_mem (dst, DEFAULT_RSTYLE);
dst.l = min (src.l, ncol);
memcpy (dst.t, src.t, sizeof (text_t) * dst.l);
memcpy (dst.r, src.r, sizeof (rend_t) * dst.l);
dst.f = src.f;
}
void ecb_cold
rxvt_term::scr_reset ()
{
#if ENABLE_OVERLAY
scr_overlay_off ();
#endif
view_start = 0;
num_scr = 0;
if (ncol == 0)
ncol = 80;
if (nrow == 0)
nrow = 24;
if (ncol == prev_ncol && nrow == prev_nrow)
return;
// we need at least two lines for wrapping to work correctly
while (nrow + saveLines < 2)
{
//TODO//FIXME
saveLines++;
prev_nrow--;
top_row--;
}
want_refresh = 1;
int prev_total_rows = prev_nrow + saveLines;
total_rows = nrow + saveLines;
screen.tscroll = 0;
screen.bscroll = nrow - 1;
void *prev_chunk = chunk;
size_t prev_chunk_size = chunk_size;
line_t *prev_drawn_buf = drawn_buf;
line_t *prev_swap_buf = swap_buf;
line_t *prev_row_buf = row_buf;
scr_alloc ();
if (!prev_row_buf)
{
top_row = 0;
term_start = 0;
memset (charsets, 'B', sizeof (charsets));
rstyle = DEFAULT_RSTYLE;
screen.flags = Screen_DefaultFlags;
screen.cur.row = screen.cur.col = 0;
screen.charset = 0;
current_screen = PRIMARY;
scr_cursor (SAVE);
#if NSCREENS
swap.flags = Screen_DefaultFlags;
swap.cur.row = swap.cur.col = 0;
swap.charset = 0;
current_screen = SECONDARY;
scr_cursor (SAVE);
current_screen = PRIMARY;
#endif
selection.text = NULL;
selection.len = 0;
selection.op = SELECTION_CLEAR;
selection.screen = PRIMARY;
selection.clicks = 0;
selection.clip_text = NULL;
selection.clip_len = 0;
}
else
{
/*
* add or delete rows as appropriate
*/
int common_col = min (prev_ncol, ncol);
for (int row = min (nrow, prev_nrow); row--; )
{
scr_blank_screen_mem (drawn_buf [row], DEFAULT_RSTYLE);
memcpy (drawn_buf [row].t, prev_drawn_buf [row].t, sizeof (text_t) * common_col);
memcpy (drawn_buf [row].r, prev_drawn_buf [row].r, sizeof (rend_t) * common_col);
copy_line (swap_buf [row], prev_swap_buf [row]);
}
int p = MOD (term_start + prev_nrow, prev_total_rows); // previous row
int pend = MOD (term_start + top_row , prev_total_rows);
int q = total_rows; // rewrapped row
if (top_row)
{
// Re-wrap lines. This is rather ugly, possibly because I am too dumb
// to come up with a lean and mean algorithm.
// TODO: maybe optimise when width didn't change
row_col_t ocur = screen.cur;
ocur.row = MOD (term_start + ocur.row, prev_total_rows);
do
{
p = MOD (p - 1, prev_total_rows);
assert (prev_row_buf [MOD (p, prev_total_rows)].t);
int plines = 1;
int llen = prev_row_buf [MOD (p, prev_total_rows)].l;
while (p != pend && prev_row_buf [MOD (p - 1, prev_total_rows)].is_longer ())
{
p = MOD (p - 1, prev_total_rows);
plines++;
llen += prev_ncol;
}
int qlines = max (0, (llen - 1) / ncol) + 1;
// drop partial lines completely
if (q < qlines)
break;
q -= qlines;
int lofs = 0;
line_t *qline;
// re-assemble the full line by destination lines
for (int qrow = q; qlines--; qrow++)
{
qline = row_buf + qrow;
qline->alloc (); // redundant with next line
qline->l = ncol;
qline->is_longer (1);
int qcol = 0;
// see below for cursor adjustment rationale
if (p == ocur.row)
screen.cur.row = q - (total_rows - nrow);
// fill a single destination line
while (lofs < llen && qcol < ncol)
{
int prow = lofs / prev_ncol;
int pcol = lofs % prev_ncol;
prow = MOD (p + prow, prev_total_rows);
// we only adjust the cursor _row_ and put it into
// the topmost line of "long line" it was in, as
// this seems to upset applications/shells/readline
// least.
if (prow == ocur.row)
screen.cur.row = q - (total_rows - nrow);
line_t &pline = prev_row_buf [prow];
int len = min (min (prev_ncol - pcol, ncol - qcol), llen - lofs);
memcpy (qline->t + qcol, pline.t + pcol, len * sizeof (text_t));
memcpy (qline->r + qcol, pline.r + pcol, len * sizeof (rend_t));
lofs += len;
qcol += len;
}
}
qline->l = llen ? MOD (llen - 1, ncol) + 1 : 0;
qline->is_longer (0);
scr_blank_line (*qline, qline->l, ncol - qline->l, DEFAULT_RSTYLE);
}
while (p != pend && q > 0);
term_start = total_rows - nrow;
top_row = q - term_start;
// make sure all terminal lines exist
while (top_row > 0)
scr_blank_screen_mem (ROW (--top_row), DEFAULT_RSTYLE);
}
else
{
// if no scrollback exists (yet), wing, instead of wrap
for (int row = min (nrow, prev_nrow); row--; )
{
line_t &src = prev_row_buf [MOD (term_start + row, prev_total_rows)];
line_t &dst = row_buf [row];
copy_line (dst, src);
}
for (int row = prev_nrow; row < nrow; row++)
scr_blank_screen_mem (row_buf [row], DEFAULT_RSTYLE);
term_start = 0;
}
clamp_it (screen.cur.row, 0, nrow - 1);
clamp_it (screen.cur.col, 0, ncol - 1);
}
for (int row = nrow; row--; )
{
if (!ROW (row).valid ()) scr_blank_screen_mem (ROW (row), DEFAULT_RSTYLE);
if (!swap_buf [row].valid ()) scr_blank_screen_mem (swap_buf [row], DEFAULT_RSTYLE);
if (!drawn_buf [row].valid ()) scr_blank_screen_mem (drawn_buf [row], DEFAULT_RSTYLE);
}
chunk_free (prev_chunk, prev_chunk_size);
free (tabs);
tabs = (char *)rxvt_malloc (ncol);
for (int col = ncol; col--; )
tabs [col] = col % TABSIZE == 0;
CLEAR_ALL_SELECTION ();
prev_nrow = nrow;
prev_ncol = ncol;
tt_winch ();
HOOK_INVOKE ((this, HOOK_RESET, DT_END));
}
void ecb_cold
rxvt_term::scr_release () NOTHROW
{
chunk_free (chunk, chunk_size);
chunk = 0;
row_buf = 0;
free (tabs);
tabs = 0;
}
/* ------------------------------------------------------------------------- */
/*
* Hard/Soft reset
*/
void ecb_cold
rxvt_term::scr_poweron ()
{
scr_release ();
prev_nrow = prev_ncol = 0;
rvideo_mode = false;
scr_soft_reset ();
scr_reset ();
scr_clear (true);
scr_refresh ();
}
void ecb_cold
rxvt_term::scr_soft_reset () NOTHROW
{
/* only affects modes, nothing drastic such as clearing the screen */
#if ENABLE_OVERLAY
scr_overlay_off ();
#endif
if (current_screen != PRIMARY)
scr_swap_screen ();
scr_scroll_region (0, MAX_ROWS - 1);
scr_rendition (0, ~RS_None);
scr_insert_mode (0);
}
/* ------------------------------------------------------------------------- *
* PROCESS SCREEN COMMANDS *
* ------------------------------------------------------------------------- */
/*
* Save and Restore cursor
* XTERM_SEQ: Save cursor : ESC 7
* XTERM_SEQ: Restore cursor: ESC 8
*/
void
rxvt_term::scr_cursor (cursor_mode mode) NOTHROW
{
screen_t *s;
#if NSCREENS && !defined(NO_SECONDARY_SCREEN_CURSOR)
if (current_screen == SECONDARY)
s = &swap;
else
#endif
s = &screen;
switch (mode)
{
case SAVE:
s->s_cur.row = screen.cur.row;
s->s_cur.col = screen.cur.col;
s->s_rstyle = rstyle;
s->s_charset = screen.charset;
s->s_charset_char = charsets[screen.charset];
break;
case RESTORE:
want_refresh = 1;
screen.cur.row = s->s_cur.row;
screen.cur.col = s->s_cur.col;
screen.flags &= ~Screen_WrapNext;
rstyle = s->s_rstyle;
screen.charset = s->s_charset;
charsets[screen.charset] = s->s_charset_char;
set_font_style ();
break;
}
/* boundary check in case screen size changed between SAVE and RESTORE */
min_it (s->cur.row, nrow - 1);
min_it (s->cur.col, ncol - 1);
assert (s->cur.row >= 0);
assert (s->cur.col >= 0);
}
void
rxvt_term::scr_swap_screen () NOTHROW
{
if (!option (Opt_secondaryScreen))
return;
for (int i = prev_nrow; i--; )
::swap (ROW(i), swap_buf [i]);
::swap (screen.cur, swap.cur);
screen.cur.row = clamp (screen.cur.row, 0, prev_nrow - 1);
screen.cur.col = clamp (screen.cur.col, 0, prev_ncol - 1);
}
/* ------------------------------------------------------------------------- */
/*
* Swap between primary and secondary screens
* XTERM_SEQ: Primary screen : ESC [ ? 4 7 h
* XTERM_SEQ: Secondary screen: ESC [ ? 4 7 l
*/
void
rxvt_term::scr_change_screen (int scrn)
{
if (scrn == current_screen)
return;
want_refresh = 1;
view_start = 0;
/* check for boundary cross */
row_col_t pos;
pos.row = pos.col = 0;
if (ROWCOL_IS_BEFORE (selection.beg, pos)
&& ROWCOL_IS_AFTER (selection.end, pos))
CLEAR_SELECTION ();
current_screen = scrn;
#if NSCREENS
if (option (Opt_secondaryScreen))
{
num_scr = 0;
scr_swap_screen ();
::swap (screen.charset, swap.charset);
::swap (screen.flags, swap.flags);
screen.flags |= Screen_VisibleCursor;
swap.flags |= Screen_VisibleCursor;
}
else
#endif
if (option (Opt_secondaryScroll))
scr_scroll_text (0, prev_nrow - 1, prev_nrow);
}
// clear WrapNext indicator, solidifying position on next line
void
rxvt_term::scr_do_wrap () NOTHROW
{
if (!(screen.flags & Screen_WrapNext))
return;
screen.flags &= ~Screen_WrapNext;
screen.cur.col = 0;
if (screen.cur.row == screen.bscroll)
scr_scroll_text (screen.tscroll, screen.bscroll, 1);
else if (screen.cur.row < nrow - 1)
screen.cur.row++;
}
/* ------------------------------------------------------------------------- */
/*
* Change the colour for following text
*/
void
rxvt_term::scr_color (unsigned int color, int fgbg) NOTHROW
{
if (!IN_RANGE_INC (color, minCOLOR, maxTermCOLOR24))
color = fgbg;
if (fgbg == Color_fg)
rstyle = SET_FGCOLOR (rstyle, color);
else
rstyle = SET_BGCOLOR (rstyle, color);
}
/* ------------------------------------------------------------------------- */
/*
* Change the rendition style for following text
*/
void
rxvt_term::scr_rendition (int set, int style) NOTHROW
{
if (set)
rstyle |= style;
else if (style == ~RS_None)
rstyle = DEFAULT_RSTYLE;
else
rstyle &= ~style;
}
/* ------------------------------------------------------------------------- */
/*
* Scroll text between <row1> and <row2> inclusive, by <count> lines
* count positive ==> scroll up
* count negative ==> scroll down
*/
int ecb_hot
rxvt_term::scr_scroll_text (int row1, int row2, int count) NOTHROW
{
if (count == 0 || (row1 > row2))
return 0;
want_refresh = 1;
num_scr += count;
if (count > 0
&& row1 == 0
&& (current_screen == PRIMARY || option (Opt_secondaryScroll)))
{
min_it (count, total_rows - (nrow - (row2 + 1)));
top_row = max (top_row - count, -saveLines);
// sever bottommost line
{
line_t &l = ROW(row2);
l.is_longer (0);
l.touch ();
}
// scroll everything up 'count' lines
term_start = (term_start + count) % total_rows;
// now copy lines below the scroll region bottom to the
// bottom of the screen again, so they look as if they
// hadn't moved.
for (int i = nrow; --i > row2; )
{
line_t &l1 = ROW(i - count);
line_t &l2 = ROW(i);
::swap (l1, l2);
l2.touch ();
}
// erase newly scrolled-in lines
for (int i = count; i--; )
{
line_t &l = ROW(row2 - i);
// optimise if already cleared, can be significant on slow machines
// could be rolled into scr_blank_screen_mem
if (l.r && l.l < ncol - 1 && !((l.r[l.l + 1] ^ rstyle) & (RS_fgMask | RS_bgMask)))
{
scr_blank_line (l, 0, l.l, rstyle);
l.l = 0;
l.f = 0;
}
else
scr_blank_screen_mem (l, rstyle);
}
// move and/or clear selection, if any
if (selection.op && current_screen == selection.screen
&& selection.beg.row <= row2)
{
selection.beg.row -= count;
selection.end.row -= count;
selection.mark.row -= count;
selection_check (0);
}
// finally move the view window, if desired
if (option (Opt_scrollWithBuffer)
&& view_start != 0
&& view_start != -saveLines)
scr_page (count);
if (SHOULD_INVOKE (HOOK_SCROLL_BACK))
HOOK_INVOKE ((this, HOOK_SCROLL_BACK, DT_INT, count, DT_INT, top_row, DT_END));
}
else
{
if (selection.op && current_screen == selection.screen)
{
if ((selection.beg.row < row1 && selection.end.row > row1)
|| (selection.beg.row < row2 && selection.end.row > row2)
|| (selection.beg.row - count < row1 && selection.beg.row >= row1)
|| (selection.beg.row - count > row2 && selection.beg.row <= row2)
|| (selection.end.row - count < row1 && selection.end.row >= row1)
|| (selection.end.row - count > row2 && selection.end.row <= row2))
{
CLEAR_ALL_SELECTION ();
selection.op = SELECTION_CLEAR;
}
else if (selection.end.row >= row1 && selection.end.row <= row2)
{
/* move selected region too */
selection.beg.row -= count;
selection.end.row -= count;
selection.mark.row -= count;
selection_check (0);
}
}
// use a simple and robust scrolling algorithm, this
// part of scr_scroll_text is not time-critical.
// sever line above scroll region
if (row1)
{
line_t &l = ROW(row1 - 1);
l.is_longer (0);
l.touch ();
}
int rows = row2 - row1 + 1;
min_it (count, rows);
line_t *temp_buf = rxvt_temp_buf<line_t> (rows);
for (int row = 0; row < rows; row++)
{
temp_buf [row] = ROW(row1 + (row + count + rows) % rows);
if (!IN_RANGE_EXC (row + count, 0, rows))
scr_blank_screen_mem (temp_buf [row], rstyle);
}
for (int row = 0; row < rows; row++)
ROW(row1 + row) = temp_buf [row];
// sever bottommost line
{
line_t &l = ROW(row2);
l.is_longer (0);
l.touch ();
}
}
return count;
}
/* ------------------------------------------------------------------------- */
/*
* Add text given in <str> of length <len> to screen struct
*/
void ecb_hot
rxvt_term::scr_add_lines (const wchar_t *str, int len, int minlines) NOTHROW
{
if (len <= 0) /* sanity */
return;
bool checksel;
unicode_t c;
int ncol = this->ncol;
const wchar_t *strend = str + len;
want_refresh = 1;
ZERO_SCROLLBACK ();
if (minlines > 0)
{
minlines += screen.cur.row - screen.bscroll;
min_it (minlines, screen.cur.row - top_row);
if (minlines > 0
&& screen.tscroll == 0
&& screen.bscroll == nrow - 1)
{
/* _at least_ this many lines need to be scrolled */
scr_scroll_text (screen.tscroll, screen.bscroll, minlines);
screen.cur.row -= minlines;
}
}
assert (screen.cur.col < ncol);
assert (screen.cur.row < nrow
&& screen.cur.row >= top_row);
int row = screen.cur.row;
checksel = selection.op && current_screen == selection.screen ? 1 : 0;
line_t *line = &ROW(row);
while (str < strend)
{
c = (unicode_t)*str++; // convert to rxvt-unicodes representation
if (ecb_unlikely (c < 0x20))
if (c == C0_LF)
{
max_it (line->l, screen.cur.col);
screen.flags &= ~Screen_WrapNext;
if (screen.cur.row == screen.bscroll)
scr_scroll_text (screen.tscroll, screen.bscroll, 1);
else if (screen.cur.row < (nrow - 1))
row = ++screen.cur.row;
line = &ROW(row); /* _must_ refresh */
continue;
}
else if (c == C0_CR)
{
max_it (line->l, screen.cur.col);
screen.flags &= ~Screen_WrapNext;
screen.cur.col = 0;
continue;
}
else if (c == C0_HT)
{
scr_tab (1, true);
continue;
}
if (ecb_unlikely (
checksel /* see if we're writing within selection */
&& !ROWCOL_IS_BEFORE (screen.cur, selection.beg)
&& ROWCOL_IS_BEFORE (screen.cur, selection.end)
))
{
checksel = 0;
/*
* If we wrote anywhere in the selected area, kill the selection
* XXX: should we kill the mark too? Possibly, but maybe that
* should be a similar check.
*/
CLEAR_SELECTION ();
}
if (ecb_unlikely (screen.flags & Screen_WrapNext))
{
scr_do_wrap ();
line->l = ncol;
line->is_longer (1);
row = screen.cur.row;
line = &ROW(row); /* _must_ refresh */
}
// some utf-8 decoders "decode" surrogate characters: let's fix this.
if (ecb_unlikely (IN_RANGE_INC (c, 0xd800, 0xdfff)))
c = 0xfffd;
// rely on wcwidth to tell us the character width, do wcwidth before
// further replacements, as wcwidth might return -1 for the line
// drawing characters below as they might be invalid in the current
// locale.
int width = WCWIDTH (c);
if (ecb_unlikely (charsets [screen.charset] == '0')) // DEC SPECIAL
{
// vt100 special graphics and line drawing
// 5f-7e standard vt100
// 40-5e rxvt extension for extra curses acs chars
static uint16_t vt100_0[62] = { // 41 .. 7e
0x2191, 0x2193, 0x2192, 0x2190, 0x2588, 0x259a, 0x2603, // 41-47 hi mr. snowman!
0, 0, 0, 0, 0, 0, 0, 0, // 48-4f
0, 0, 0, 0, 0, 0, 0, 0, // 50-57
0, 0, 0, 0, 0, 0, 0, 0x0020, // 58-5f
0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1, // 60-67
0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba, // 68-6f
0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c, // 70-77
0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, // 78-7e
};
if (c >= 0x41 && c <= 0x7e && vt100_0[c - 0x41])
{
c = vt100_0[c - 0x41];
width = 1; // vt100 line drawing characters are always single-width
}
}
if (ecb_unlikely (screen.flags & Screen_Insert))
scr_insdel_chars (width, INSERT);
if (width != 0)
{
#if !UNICODE_3
// trim characters we can't store directly :(
if (c >= 0x10000)
# if ENABLE_COMBINING
c = rxvt_composite.compose (c); // map to lower 16 bits
# else
c = 0xfffd;
# endif
#endif
rend_t rend = SET_FONT (rstyle, FONTSET (rstyle)->find_font (c));
// if the character doesn't fit into the remaining columns...
if (ecb_unlikely (screen.cur.col > ncol - width && ncol >= width))
{
if (screen.flags & Screen_Autowrap)
{
// ... artificially enlargen the previous one
c = NOCHAR;
// and try the same character next loop iteration
--str;
}
else
screen.cur.col = ncol - width;
}
// nuke the character at this position, if required
// due to wonderful coincidences everywhere else in this loop
// we never have to check for overwriting a wide char itself,
// only its tail.
if (ecb_unlikely (line->t[screen.cur.col] == NOCHAR))
scr_kill_char (*line, screen.cur.col);
line->touch ();
do
{
line->t[screen.cur.col] = c;
line->r[screen.cur.col] = rend;
if (ecb_likely (screen.cur.col < ncol - 1))
screen.cur.col++;
else
{
line->l = ncol;
if (screen.flags & Screen_Autowrap)
screen.flags |= Screen_WrapNext;
goto end_of_line;
}
c = NOCHAR;
}
while (ecb_unlikely (--width > 0));
// pad with spaces when overwriting wide character with smaller one
for (int c = screen.cur.col; ecb_unlikely (c < ncol && line->t[c] == NOCHAR); c++)
{
line->t[c] = ' ';
line->r[c] = rend;
}
end_of_line:
;
}
#if ENABLE_COMBINING
else // width == 0
{
if (c != 0xfeff) // ignore BOM
{
// handle combining characters
// we just tag the accent on the previous on-screen character.