[newlib-cygwin] Cygwin: pty: Fix a bug in input transfer for GDB.

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2b94fad48edf07490113ab5052f2a39cfccb43c9

commit 2b94fad48edf07490113ab5052f2a39cfccb43c9
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Mon Feb 15 03:47:51 2021 +0900

    Cygwin: pty: Fix a bug in input transfer for GDB.
    
    - With this patch, not only NL but also CR is treated as a line end
      in the code checking if input transfer is necessary.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index f6eb3ae4d..5afede859 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -1181,7 +1181,7 @@ fhandler_pty_slave::mask_switch_to_pcon_in (bool mask, bool xfer)
   /* In GDB, transfer input based on setpgid() does not work because
      GDB may not set terminal process group properly. Therefore,
      transfer input here if isHybrid is set. */
-  if (get_ttyp ()->switch_to_pcon_in && !!masked != mask && xfer && isHybrid)
+  if (isHybrid && !!masked != mask && xfer)
     {
       if (mask && get_ttyp ()->pcon_input_state_eq (tty::to_nat))
 	{
@@ -1471,7 +1471,8 @@ wait_retry:
 out:
   termios_printf ("%d = read(%p, %lu)", totalread, ptr, len);
   len = (size_t) totalread;
-  mask_switch_to_pcon_in (false, totalread > 0 && ptr0[totalread - 1] == '\n');
+  bool saw_eol = totalread > 0 && strchr ("\r\n", ptr0[totalread -1]);
+  mask_switch_to_pcon_in (false, saw_eol);
 }
 
 int