--- /dev/null
+#include <stdio.h>
+#include <stdarg.h>
+#define error(...) test_error(__FILE__, __LINE__, __VA_ARGS__)
+
+static int test_status;
+
+static int test_error(const char *n, int l, const char *s, ...)
+{
+ va_list ap;
+
+ if (test_status == 0)
+ printf("FAIL\n");
+ test_status = 1;
+ printf(" ERROR %s:%d: ", n, l);
+ va_start(ap, s);
+ vprintf(s, ap);
+ va_end(ap);
+ return -1;
+}
+