my_hostname.h

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/*
 * Copyright (c) 2019, 2025, Oracle and/or its affiliates.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2.0,
 * as published by the Free Software Foundation.
 *
 * This program is designed to work with certain software (including
 * but not limited to OpenSSL) that is licensed under separate terms,
 * as designated in a particular file or component or in included license
 * documentation.  The authors of MySQL hereby grant you an additional
 * permission to link the program and your derivative works with the
 * separately licensed software that they have either included with
 * the program or referenced in the documentation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License, version 2.0, for more details.
 *
 * You should have received a copy of the GNU General Public License
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 */
 
/**
  @file include/my_hostname.h
  Common definition used by mysys, performance schema and server & client.
*/
 
#ifndef MY_HOSTNAME_INCLUDED
#define MY_HOSTNAME_INCLUDED
 
/*
   Note that this is the actual length available, and that room
   for a trailing '\0' is not included in this size.
 
   The metadata columns storing hostname use single byte character
   as they are using ASCII character set.
 
   pre 8.0.17: 60 characters
*/
static constexpr int HOSTNAME_LENGTH = 255;
 
/*
  Number of characters that a port number can have.
  As per rfc6335 section 6, the range is 0 to 65535.
*/
static constexpr int PORTNUMBER_LENGTH = 5;
 
/**
  Length of "hostname:portnumber".
  This does not include the trailing '\0'.
*/
static constexpr int HOST_AND_PORT_LENGTH =
    (HOSTNAME_LENGTH + 1 + PORTNUMBER_LENGTH);
 
#endif /* MY_HOSTNAME_INCLUDED */