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From:	ian DOT ray AT nokia DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: Shell CAPS-lock settings
Date:	Thu, 11 Oct 2001 18:12:01 +0300
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Hi,


Chris wrote:
> That someone was probably me.  I was asking for someone to provide
> a patch.
> Nobody ever has.
>
> cgf


http://www.ladybridge.com/qm_faq4f.htm
"On Windows 95, the Caps Lock key toggles all keys, not just the alpha
keys.
This is a Windows 95 bug in the Windows ReadConsoleInput API."

http://support.microsoft.com/support/kb/articles/Q140/4/56.asp
"Deadkeys cannot be accepted as input to a Windows 95 Console
application
even when the appropriate keyboard layout is selected.
ReadConsoleInput()
cannot read in deadkeys on Windows 95."

ftp://ftp.microsoft.com/developr/win32dk/kb/q137/1/95.txt
"Unpredictable results occur if you use ReadConsole and ReadConsoleInput
together in a Windows 95-based application. Do not mix the two functions
when using a single console."


I have made a proposed patch (breaking Microsoft advice, above).
I did this work against cygwin-snapshot-20011005-1.

This patch must be tested in Win95, Win98, and WinNT. I only have time
for some basic, UK-keyboard/British-English tests on Win95 and WinNT.

Comments? Testers?


Blue skies,
ianr

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Thu Oct 11 15:47:15 2001  Ian Ray <ian DOT ray AT nokia DOT com>

	* fhandler_console.cc (fhandler_console::read): On Win95, the Caps Lock
	  key toggles all keys, not just the alpha keys;  we work around this 
	  by reading non-enhanced key-presses using the ReadConsole() function.


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--- fhandler_console.cc-orig	Thu Oct 11 15:44:55 2001
+++ fhandler_console.cc	Thu Oct 11 15:47:15 2001
@@ -248,11 +248,34 @@ fhandler_console::read (void *pv, size_t
       INPUT_RECORD input_rec;
       const char *toadd = NULL;
 
-      if (!ReadConsoleInput (h, &input_rec, 1, &nread))
+      if (!PeekConsoleInput (h, &input_rec, 1, &nread))
 	{
 	  __seterrno ();
 	  syscall_printf ("ReadConsoleInput failed, %E");
 	  return -1;		/* seems to be failure */
+	}
+
+      /*
+       * On Win95, the Caps Lock key toggles all keys, not just the alpha keys;
+       * we work around this by reading non-enhanced key-*presses* using the
+       * ReadConsole() function.
+       */
+      int is_win95_workaround =
+	   (!wincap.is_winnt())
+	&& (input_rec.EventType == KEY_EVENT)
+	&& (input_rec.Event.KeyEvent.bKeyDown)
+	&& (!(input_rec.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY))
+	;
+
+      if (is_win95_workaround)
+        {
+	  DWORD  ch;
+	  (void) ReadConsole (h, &ch, 1, &nread, NULL);
+	  input_rec.Event.KeyEvent.uChar.AsciiChar = (unsigned char)ch;
+	}
+      else
+        {
+          (void) ReadConsoleInput (h, &input_rec, 1, &nread);
 	}
 
       /* check the event that occurred */


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