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Cygwin: console: Fix workaround for horizontal tab position

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- The workaround commit 33a21904a702191cebf0e81b4deba2dfa10a406c
  does not work as expected if window size is changed while screen
  is alternated. Fixed.
This commit is contained in:
Takashi Yano 2019-08-15 14:02:05 +09:00 committed by Ken Brown
parent 8d81fcc18e
commit e548c131d8
1 changed files with 29 additions and 18 deletions
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47
winsup/cygwin/fhandler_console.cc
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@ -319,6 +319,25 @@ fhandler_console::set_cursor_maybe ()
}
}
/* Workaround for a bug of windows xterm compatible mode. */
/* The horizontal tab positions are broken after resize. */
static void
fix_tab_position (HANDLE h, SHORT width)
{
char buf[2048] = {0,};
/* Save cursor position */
__small_sprintf (buf+strlen (buf), "\0337");
/* Clear all horizontal tabs */
__small_sprintf (buf+strlen (buf), "\033[3g");
/* Set horizontal tabs */
for (int col=8; col<width; col+=8)
__small_sprintf (buf+strlen (buf), "\033[%d;%dH\033H", 1, col+1);
/* Restore cursor position */
__small_sprintf (buf+strlen (buf), "\0338");
DWORD dwLen;
WriteConsole (h, buf, strlen (buf), &dwLen, 0);
}
bool
fhandler_console::send_winch_maybe ()
{
@ -331,24 +350,7 @@ fhandler_console::send_winch_maybe ()
con.scroll_region.Top = 0;
con.scroll_region.Bottom = -1;
if (wincap.has_con_24bit_colors ())
{
/* Workaround for a bug of windows xterm compatible mode. */
/* The horizontal tab positions are broken after resize. */
DWORD dwLen;
CONSOLE_SCREEN_BUFFER_INFO sbi;
GetConsoleScreenBufferInfo (get_output_handle (), &sbi);
/* Clear all horizontal tabs */
WriteConsole (get_output_handle (), "\033[3g", 4, &dwLen, 0);
/* Set horizontal tabs */
for (int col=8; col<con.dwWinSize.X; col+=8)
{
char buf[32];
__small_sprintf (buf, "\033[%d;%dH\033H", 1, col+1);
WriteConsole (get_output_handle (), buf, strlen (buf), &dwLen, 0);
}
/* Restore cursor position */
SetConsoleCursorPosition (get_output_handle (), sbi.dwCursorPosition);
}
fix_tab_position (get_output_handle (), con.dwWinSize.X);
get_ttyp ()->kill_pgrp (SIGWINCH);
return true;
}
@ -1615,6 +1617,12 @@ static const wchar_t __vt100_conv[31] = {
inline
bool fhandler_console::write_console (PWCHAR buf, DWORD len, DWORD& done)
{
bool need_fix_tab_position = false;
/* Check if screen will be alternated. */
if (wincap.has_con_24bit_colors ()
&& memmem (buf, len*sizeof (WCHAR), L"\033[?1049", 7*sizeof (WCHAR)))
need_fix_tab_position = true;
if (con.iso_2022_G1
? con.vt100_graphics_mode_G1
: con.vt100_graphics_mode_G0)
@ -1633,6 +1641,9 @@ bool fhandler_console::write_console (PWCHAR buf, DWORD len, DWORD& done)
len -= done;
buf += done;
}
/* Call fix_tab_position() if screen has been alternated. */
if (need_fix_tab_position)
fix_tab_position (get_output_handle (), con.dwWinSize.X);
return true;
}