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Cygwin: pty: Fix screen distortion after using less for native apps. 

- If the output of non-cygwin apps is browsed using less, screen is
  ocasionally distorted after less exits. This frequently happens
  if cmd.exe is executed after less. This patch fixes the issue.
This commit is contained in:
Takashi Yano via Cygwin-patches 2020-06-01 15:16:18 +09:00 committed by Corinna Vinschen
parent d212bdc400
commit c4b060e3fe
1 changed files with 11 additions and 8 deletions
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19
winsup/cygwin/fhandler_tty.cc
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@ -1372,7 +1372,7 @@ fhandler_pty_slave::push_to_pcon_screenbuffer (const char *ptr, size_t len,
p0 = (char *) memmem (p1, nlen - (p1-buf), "\033[?1049h", 8);
if (p0)
{
//p0 += 8;
p0 += 8;
get_ttyp ()->screen_alternated = true;
if (get_ttyp ()->switch_to_pcon_out)
do_not_reset_switch_to_pcon = true;
@ -1384,7 +1384,7 @@ fhandler_pty_slave::push_to_pcon_screenbuffer (const char *ptr, size_t len,
p1 = (char *) memmem (p0, nlen - (p0-buf), "\033[?1049l", 8);
if (p1)
{
p1 += 8;
//p1 += 8;
get_ttyp ()->screen_alternated = false;
do_not_reset_switch_to_pcon = false;
memmove (p0, p1, buf+nlen - p1);
@ -1504,7 +1504,10 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
reset_switch_to_pcon ();
UINT target_code_page = get_ttyp ()->switch_to_pcon_out ?
bool output_to_pcon =
get_ttyp ()->switch_to_pcon_out && !get_ttyp ()->screen_alternated;
UINT target_code_page = output_to_pcon ?
GetConsoleOutputCP () : get_ttyp ()->term_code_page;
ssize_t nlen;
char *buf = convert_mb_str (target_code_page, (size_t *) &nlen,
@ -1513,11 +1516,11 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
/* If not attached to this pseudo console, try to attach temporarily. */
pid_restore = 0;
bool fallback = false;
if (get_ttyp ()->switch_to_pcon_out && pcon_attached_to != get_minor ())
if (output_to_pcon && pcon_attached_to != get_minor ())
if (!try_reattach_pcon ())
fallback = true;
if (get_ttyp ()->switch_to_pcon_out && !fallback &&
if (output_to_pcon && !fallback &&
(memmem (buf, nlen, "\033[6n", 4) || memmem (buf, nlen, "\033[0c", 4)))
{
get_ttyp ()->pcon_in_empty = false;
@ -1530,12 +1533,12 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
if (!(get_ttyp ()->ti.c_oflag & OPOST) ||
!(get_ttyp ()->ti.c_oflag & ONLCR))
flags |= DISABLE_NEWLINE_AUTO_RETURN;
if (get_ttyp ()->switch_to_pcon_out && !fallback)
if (output_to_pcon && !fallback)
{
GetConsoleMode (get_output_handle (), &dwMode);
SetConsoleMode (get_output_handle (), dwMode | flags);
}
HANDLE to = (get_ttyp ()->switch_to_pcon_out && !fallback) ?
HANDLE to = (output_to_pcon && !fallback) ?
get_output_handle () : get_output_handle_cyg ();
acquire_output_mutex (INFINITE);
if (!process_opost_output (to, buf, nlen, false))
@ -1555,7 +1558,7 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
release_output_mutex ();
mb_str_free (buf);
flags = ENABLE_VIRTUAL_TERMINAL_PROCESSING;
if (get_ttyp ()->switch_to_pcon_out && !fallback)
if (output_to_pcon && !fallback)
SetConsoleMode (get_output_handle (), dwMode | flags);
restore_reattach_pcon ();