Get the full name of a user

Sometimes we need to present a welcome message to the users. Instead of saying "welcome" followed by sy-uname, it would be nicer if we use the full name of user as set by him/her in his profile. e.g. <Dr. Mr. FirstName Surname>. Here is the code to get the full name.
The code was written in version 4.7 and should work in 4.6B and above,

DATA: l_user_data TYPE soudatai1,
      l_user TYPE soudnamei1,
      l_fullname type SO_ADRNAM.

* give the logged on user id
  l_user-sapname = sy-uname.

* get the user data
  CALL FUNCTION 'SO_USER_READ_API1'
    EXPORTING
      user      = l_user
    IMPORTING
      user_data = l_user_data.

* get the user full name
  l_fullname = l_user_data-fullname.