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1. drupal
   1. drupal6

Code

modules/user/user.module, line 1596

<?php
function _user_edit_validate($uid, &$edit) {
  // Validate the username when: new user account; or user is editing own account and can change username; or an admin user.
  if (!$uid || ($GLOBALS['user']->uid == $uid && user_access('change own username')) || user_access('administer users')) {
    if ($error = user_validate_name($edit['name'])) {
      form_set_error('name', $error);
    }
    else if (db_result(db_query("SELECT COUNT(*) FROM {users} WHERE uid != %d AND LOWER(name) = LOWER('%s')", $uid, $edit['name'])) > 0) {
      form_set_error('name', t('The name %name is already taken.', array('%name' => $edit['name'])));
    }
    else if (drupal_is_denied('user', $edit['name'])) {
      form_set_error('name', t('The name %name has been denied access.', array('%name' => $edit['name'])));
    }
  }

  // Validate the e-mail address:
  if ($error = user_validate_mail($edit['mail'])) {
    form_set_error('mail', $error);
  }
  else if (db_result(db_query("SELECT COUNT(*) FROM {users} WHERE uid != %d AND LOWER(mail) = LOWER('%s')", $uid, $edit['mail'])) > 0) {
    form_set_error('mail', t('The e-mail address %email is already registered. <a href="@password">Have you forgotten your password?</a>', array('%email' => $edit['mail'], '@password' => url('user/password'))));
  }
  else if (drupal_is_denied('mail', $edit['mail'])) {
    form_set_error('mail', t('The e-mail address %email has been denied access.', array('%email' => $edit['mail'])));
  }
}
?>