Win32: fix segfault in WriteConsoleW when debugging in gdb

On Windows XP (not Win7), WriteConsoleW and WriteFile seem to raise and
catch SIGSEGV if the lpNumberOfCharsWritten parameter is NULL. This is not
a problem when executed standalone, but gdb stops execution here (unless
disabled via "handle SIGSEGV nostop").

Fix it by passing a dummy variable.

Signed-off-by: Karsten Blees <[email protected]>

Author: kblees

compat/winansi.c

@@ -72,7 +72,8 @@ static void warn_if_raster_font(void)
 			L"doesn\'t support Unicode. If you experience strange "
 			L"characters in the output, consider switching to a "
 			L"TrueType font such as Lucida Console!\n";
-		WriteConsoleW(console, msg, wcslen(msg), NULL, NULL);
+		DWORD dummy;
+		WriteConsoleW(console, msg, wcslen(msg), &dummy, NULL);
 	}
 }
 
@@ -114,12 +115,13 @@ static void write_console(unsigned char *str, size_t len)
 {
 	/* only called from console_thread, so a static buffer will do */
 	static wchar_t wbuf[2 * BUFFER_SIZE + 1];
+	DWORD dummy;
 
 	/* convert utf-8 to utf-16 */
 	int wlen = xutftowcsn(wbuf, (char*) str, ARRAY_SIZE(wbuf), len);
 
 	/* write directly to console */
-	WriteConsoleW(console, wbuf, wlen, NULL, NULL);
+	WriteConsoleW(console, wbuf, wlen, &dummy, NULL);
 
 	/* remember if non-ascii characters are printed */
 	if (wlen != len)