7 uses of USERNAME_MAX_LENGTH in Drupal 6

install_configure_form in ./install.php

Form API array definition for site configuration.

user_admin_check_user in modules/user/user.admin.inc

user_edit_form in modules/user/user.module

user_login in modules/user/user.module

Form builder; the main user login form.

user_login_block in modules/user/user.module

user_pass in modules/user/user.pages.inc

Form builder; Request a password reset.

user_validate_name in modules/user/user.module

Verify the syntax of the given name.