Index: invite_admin.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/invite/invite_admin.inc,v
retrieving revision 1.3.2.2
diff -u -p -r1.3.2.2 invite_admin.inc
--- invite_admin.inc	19 Apr 2009 21:26:01 -0000	1.3.2.2
+++ invite_admin.inc	15 Jun 2009 13:27:32 -0000
@@ -67,12 +67,12 @@ function invite_settings() {
       '#required' => TRUE,
     );
     $form['role'][$role_no_space]['invite_maxnum_'. $role_no_space] = array(
-      '#type' => 'select',
+      '#type' => 'textfield',
       '#title' => t('Invitation limit'),
       '#default_value' => variable_get('invite_maxnum_'. $role_no_space, INVITE_UNLIMITED),
-      '#options' => array(5 => 5, 10 => 10, 20 => 20, 50 => 50, 100 => 100, 500 => 500, 1000 => 1000, INVITE_UNLIMITED => t('unlimited')),
-      '#description' => t('Allows to limit the total number of invitations members of %role can send.', array('%role' => $role)),
-      '#multiple' => FALSE,
+      '#size' => 10,
+      '#maxlength' => 10,
+      '#description' => t('Limits the total numbers of invites users of role %role can send. Enter %unlimited for unlimited.', array('%role' => $role, '%unlimited' => INVITE_UNLIMITED)),
       '#required' => TRUE,
     );
   }
@@ -168,6 +168,22 @@ function invite_settings() {
 }
 
 /**
+ * Validates the settings form.
+ */
+function invite_settings_validate($form, &$form_state) {
+  // Check all of the invite limits are non-negative integers or INVITE_UNLIMITED.
+  foreach (user_roles(0, 'send invitations') as $readable_role) {
+    $role = str_replace(' ', '_', $readable_role);
+    $value = $form_state['values']["invite_maxnum_$role"];
+    if (!is_numeric($value) or round($value) != (float)$value or INVITE_UNLIMITED > (int)$value) {
+      $vars = array('%role' => drupal_ucfirst($readable_role), '%zero' => 0, '%unlimited' => INVITE_UNLIMITED);
+      $message = t('Limit of %role must be at least %zero (zero), or %unlimited for unlimited.', $vars);
+      form_set_error("invite_maxnum_$role", $message);
+    }
+  }
+}
+
+/**
  * Return a list of all users that have invited someone.
  */
 function invite_admin_overview() {