[newlib-cygwin] Cygwin: pty: Fix input charset for non-cygwin apps with disable_pcon.

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=fd3ad92f9ee1e6f58ffe3597fbd5bba3c778677d

commit fd3ad92f9ee1e6f58ffe3597fbd5bba3c778677d
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Thu Sep 10 00:28:00 2020 +0900

    Cygwin: pty: Fix input charset for non-cygwin apps with disable_pcon.
    
    - If the non-cygwin apps is executed under pseudo console disabled,
      multibyte input for the apps are garbled. This patch fixes the
      issue.

Diff:
---
 winsup/cygwin/fhandler_tty.cc | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 0bfc32ea9..16d4a99f4 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -295,8 +295,22 @@ fhandler_pty_master::accept_input ()
   bytes_left = eat_readahead (-1);
 
   HANDLE write_to = get_output_handle ();
+  tmp_pathbuf tp;
   if (to_be_read_from_pcon ())
-    write_to = to_slave;
+    {
+      write_to = to_slave;
+      UINT cp_to = GetConsoleCP ();
+      if (get_ttyp ()->term_code_page != cp_to)
+	{
+	  static mbstate_t mbp;
+	  char *mbbuf = tp.c_get ();
+	  size_t nlen = NT_MAX_PATH;
+	  convert_mb_str (cp_to, mbbuf, &nlen,
+			  get_ttyp ()->term_code_page, p, bytes_left, &mbp);
+	  p = mbbuf;
+	  bytes_left = nlen;
+	}
+    }
 
   if (!bytes_left)
     {