Env Interface

The Env interface allows you to access the values of environment variables.

INTERFACE Env;

PROCEDURE Get(nm: TEXT): TEXT;
(* Return the value of the environment variable whose name is equal to
   "nm", or "NIL" if there is no such variable. *)

VAR (*CONST*) Count: CARDINAL;
(* Environment variables are indexed from "0" to "Count-1". *)

PROCEDURE GetNth(n: CARDINAL; VAR (*OUT*) nm, val: TEXT);
(* Set "nm" and "val" to the name and value of the environment
   variable with index "n".  It is a checked runtime error if "n >=
   Count".  *)

END Env.