Function pg_encoding_max_length

src/common/wchar.c:2025–2037

* fetch maximum length of a given encoding */

 * fetch maximum length of a given encoding
 */
int
pg_encoding_max_length(int encoding)
{
	Assert(PG_VALID_ENCODING(encoding));

	/*
	 * Check for the encoding despite the assert, due to some mingw versions
	 * otherwise issuing bogus warnings.
	 */
	return PG_VALID_ENCODING(encoding) ?
		pg_wchar_table[encoding].maxmblen :
		pg_wchar_table[PG_SQL_ASCII].maxmblen;
}