simple stdarg test

test/misc/stdarg.c

@@ -0,0 +1,19 @@
+/* copied from rsync */
+
+#include <sys/types.h>
+#include <stdarg.h>
+void foo(const char *format, ...) {
+	va_list ap;
+	int len;
+	char buf[5];
+
+	va_start(ap, format);
+	len = vsnprintf(0, 0, format, ap);
+	va_end(ap);
+	if (len != 5) exit(1);
+
+	if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(1);
+
+	exit(0);
+}
+int main() { foo("hello"); }