libm3/src/params/Env.i3

 Copyright (C) 1989, Digital Equipment Corporation           
 All rights reserved.                                        
 See the file COPYRIGHT for a full description.              
 Last modified on Wed Dec 15 15:12:34 PST 1993 by mcjones    
      modified on Wed Mar  4 08:31:11 1992 by kalsow         
      modified on Sat Sep 15 02:51:50 1990 by muller         
      modified on Mon Sep  5 17:21:33 1988 by stolfi         
      modified on Fri Jun 10 14:20:12 1988 by glassman       
      modified On Tue Sep 10 15:28:14 1985 By rovner         


 This interface provides access to the environment variables given
   to a process when it is started (see Process.Create).
   \index{environment variables}
   \index{process!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.