#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
+#include <assert.h>
#include <stdarg.h>
#define PUTTY_DO_GLOBALS /* actually _define_ globals */
HANDLE h = (is_stderr ? errhandle : outhandle);
int osize, esize;
+ assert(len > 0);
+
if (is_stderr) {
bufchain_add(&stderr_data, data, len);
try_output(1);