extern "C" {

#include "postgres.h"

#include "fmgr.h"

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(silly_func);

}

extern "C" Datum
silly_func(PG_FUNCTION_ARGS)
{
	char	   *str = PG_GETARG_CSTRING(0);

	PG_RETURN_INT32(strlen(str));
}