Borland acts like *nix in vsnprintf() if len is 0 (Hooray!)

src/conio/ciolib.c

@@ -663,7 +663,7 @@ int ciolib_cprintf(char *fmat, ...)
 {
     va_list argptr;
 	int		ret;
-#ifdef _WIN32			/* Can't figure out a way to allocate a "big enough" buffer for Win32. */
+#ifdef _MSC_VER		/* Can't figure out a way to allocate a "big enough" buffer for Win32. */
 	char	str[16384];
 #else
 	char	*str;
@@ -672,7 +672,7 @@ int ciolib_cprintf(char *fmat, ...)
 	CIOLIB_INIT();
 
     va_start(argptr,fmat);
-#ifdef _WIN32
+#ifdef _MSC_VER
 	ret=_vsnprintf(str,sizeof(str)-1,fmat,argptr);
 #else
     ret=vsnprintf(NULL,0,fmat,argptr);