[newlib-cygwin] Cygwin: console: ignore NUL byte on write in xterm emulation mode as well

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c9f153580bfb4db4f9ef023b99360d7a746bd450

commit c9f153580bfb4db4f9ef023b99360d7a746bd450
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Thu Feb 20 14:48:03 2020 +0100

    Cygwin: console: ignore NUL byte on write in xterm emulation mode as well
    
    A NUL byte in the output stream got accidentally not handled as IGN char
    in xterm console mode.  The internal mbtowc conversion doesn't handle
    embedded NUL values gracefully, it always stops converting at NUL bytes.
    This broke the output of strings with embedded NUL bytes.
    
    Fix this by always skipping IGN chars in the "normal char output loop"
    and make sure not to move the cursor one position to the right, as in
    legacy console mode.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/fhandler_console.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index 66e645a..c062fd7 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -2641,6 +2641,7 @@ fhandler_console::write_normal (const unsigned char *src,
   memset (&ps, 0, sizeof ps);
   while (found < end
 	 && found - src < CONVERT_LIMIT
+	 && base_chars[*found] != IGN
 	 && ((wincap.has_con_24bit_colors () && !con_is_legacy)
 	     || base_chars[*found] == NOR) )
     {
@@ -2732,7 +2733,8 @@ do_print:
 	  cursor_rel (-1, 0);
 	  break;
 	case IGN:
-	  cursor_rel (1, 0);
+	 if (!wincap.has_con_24bit_colors () || con_is_legacy)
+	    cursor_rel (1, 0);
 	  break;
 	case CR:
 	  cursor_get (&x, &y);