[newlib-cygwin/cygwin-3_3-branch] Cygwin: pty: Treat *.bat and *.cmd as a non-cygwin console app.

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2b4f986e499f040966be72516dae5b01ef721d24

commit 2b4f986e499f040966be72516dae5b01ef721d24
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Sun Jul 31 17:42:00 2022 +0900

    Cygwin: pty: Treat *.bat and *.cmd as a non-cygwin console app.
    
    - If *.bat or *.cmd is executed directly from cygwin shell, pty
      failed to switch I/O pipe to that for native apps. This patch
      fixes the issue.

Diff:
---
 winsup/cygwin/release/3.3.6 | 5 +++++
 winsup/cygwin/spawn.cc      | 7 ++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/release/3.3.6 b/winsup/cygwin/release/3.3.6
index 44a7bcf9d..5fb59bf7d 100644
--- a/winsup/cygwin/release/3.3.6
+++ b/winsup/cygwin/release/3.3.6
@@ -26,3 +26,8 @@ Bug Fixes
 - Fix a console problem that the text longer than 1024 bytes cannot
   be pasted correctly.
   Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251764.html
+
+- Fix a pty problem that pty failed to switch I/O pipe to that for
+  native apps if *.bat or *.cmd is executed directly from cygwin
+  shell.
+  Addresses: https://cygwin.com/pipermail/cygwin/2022-July/251993.html
diff --git a/winsup/cygwin/spawn.cc b/winsup/cygwin/spawn.cc
index e0f1247e1..4ec6a8789 100644
--- a/winsup/cygwin/spawn.cc
+++ b/winsup/cygwin/spawn.cc
@@ -210,7 +210,12 @@ is_console_app (WCHAR *filename)
   if (p && p + id_offset <= buf + n)
     return p[id_offset] == '\003'; /* 02: GUI, 03: console */
   else
-    return false;
+    {
+      wchar_t *e = wcsrchr (filename, L'.');
+      if (e && (wcscasecmp (e, L".bat") == 0 || wcscasecmp (e, L".cmd") == 0))
+	return true;
+    }
+  return false;
 }
 
 int