Function unpack_sql_state

src/backend/utils/error/elog.c:3619–3633

* Unpack MAKE_SQLSTATE code. Note that this returns a pointer to a * static buffer. */

 * static buffer.
 */
char *
unpack_sql_state(int sql_state)
{
	static char buf[12];
	int			i;

	for (i = 0; i < 5; i++)
	{
		buf[i] = PGUNSIXBIT(sql_state);
		sql_state >>= 6;
	}

	buf[i] = '\0';
	return buf;
}

#define WRITE_PIPE_CHUNK_TIMEOUT 1000