Menu driver processing

The menu_driver is the workhorse of the menu system. Once the menu is posted, the menu_driver handles all interaction with the end-user. It responds to

• item navigation requests

• menu scrolling requests

• item selection requests

• pattern buffer requests

SYNOPSIS

   int menu_driver (menu, c)
   MENU  menu;
   int c;

To enable your application program to fetch the character for the menu driver, you write a routine that defines the input key virtualization. This is the correspondence between specific input keys, control characters, or escape sequences on the one hand and menu driver requests on the other. The virtualization routine returns a specific menu request or application command that the menu driver can process. Upon return from the menu driver, your application can check if the input was processed appropriately. If not, your application specifies the action to be taken. These actions may include terminating interaction with the menu, responding to help requests, generating an error message, and so forth.