Function pg_valid_client_encoding

src/common/encnames.c:485–497

---------- * Encoding checks, for error returns -1 else encoding id * ---------- */

 * ----------
 */
int
pg_valid_client_encoding(const char *name)
{
	int			enc;

	if ((enc = pg_char_to_encoding(name)) < 0)
		return -1;

	if (!PG_VALID_FE_ENCODING(enc))
		return -1;

	return enc;
}

int
pg_valid_server_encoding(const char *name)