* autoload (noload): Avoid clobbering bx register.

* environ.cc (codepage_init): Use case insensitive match.
* fhandler_console.cc (cp_get_internal): Delete.
(con_to_str): Use get_cp to derive code page.
(str_to_con): Ditto.
* miscfuncs.cc (get_cp): New function.
(sys_wcstombs): New function.  Converted from macro.
(sys_mbstowcs): Ditto.
* winsup.h: Reflect above changes.

winsup/cygwin/autoload.cc

@@ -122,10 +122,10 @@ noload:									\n\
 	jz	1f		# Nope.					\n\
 	decl	%eax		# Yes.  This is the # of bytes + 1	\n\
 	popl	%edx		# Caller's caller			\n\
-	movl	%eax,%ebx	# For manipulation			\n\
-	andl	$0xffff,%eax	# Only want lower word			\n\
 	addl	%eax,%esp	# Pop off bytes				\n\
-	pushl	%ebx		# Save for later			\n\
+	andl	$0xffff0000,%eax# upper word				\n\
+	subl	%eax,%esp	# adjust for possible return value	\n\
+	pushl	%eax		# Save for later			\n\
 	movl	$127,%eax	# ERROR_PROC_NOT_FOUND			\n\
 	pushl	%eax		# First argument			\n\
 	call	_SetLastError@4	# Set it				\n\