* +-======-+ 
*  Copyright (c) 2003-2018 United States Government as represented by 
*  the Admistrator of the National Aeronautics and Space Administration.  
*  All Rights Reserved.
*  
*  THIS OPEN  SOURCE  AGREEMENT  ("AGREEMENT") DEFINES  THE  RIGHTS  OF USE,
*  REPRODUCTION,  DISTRIBUTION,  MODIFICATION AND REDISTRIBUTION OF CERTAIN 
*  COMPUTER SOFTWARE ORIGINALLY RELEASED BY THE UNITED STATES GOVERNMENT AS 
*  REPRESENTED BY THE GOVERNMENT AGENCY LISTED BELOW ("GOVERNMENT AGENCY").  
*  THE UNITED STATES GOVERNMENT, AS REPRESENTED BY GOVERNMENT AGENCY, IS AN 
*  INTENDED  THIRD-PARTY  BENEFICIARY  OF  ALL  SUBSEQUENT DISTRIBUTIONS OR 
*  REDISTRIBUTIONS  OF THE  SUBJECT  SOFTWARE.  ANYONE WHO USES, REPRODUCES, 
*  DISTRIBUTES, MODIFIES  OR REDISTRIBUTES THE SUBJECT SOFTWARE, AS DEFINED 
*  HEREIN, OR ANY PART THEREOF,  IS,  BY THAT ACTION, ACCEPTING IN FULL THE 
*  RESPONSIBILITIES AND OBLIGATIONS CONTAINED IN THIS AGREEMENT.
*  
*  Government Agency: National Aeronautics and Space Administration
*  Government Agency Original Software Designation: GSC-15354-1
*  Government Agency Original Software Title:  GEOS-5 GCM Modeling Software
*  User Registration Requested.  Please Visit http://opensource.gsfc.nasa.gov
*  Government Agency Point of Contact for Original Software:  
*  			Dale Hithon, SRA Assistant, (301) 286-2691
*  
* +-======-+ 
  function gettxt (args)
  name = subwrd(args,1)
  tag  = subwrd(args,2)

* Extract VAR between quotes
* --------------------------
       last = substr(name,1,1)
       if( last = '"' )
            nmax = 200
               n = 2
       while ( n<max )
       last = substr(name,n,1)
       if( last = '"' )
           len = n-2
             n = max
       else
             n = n+1
       endif
       endwhile
       var = substr( name,2,len )
       else
       var = name
       endif

* Check for VAR textfile
* ----------------------
    filename = var % ".txt"
   '!remove   grads.txt'
   '!listfile 'var'.txt > grads.txt'
    checkls = sublin ( read(grads.txt),2 )
                      close(grads.txt)
    if( checkls = filename )
      '!remove  grads.txt'
      '!grepfile 'filename' 'tag
        envar = sublin ( read(grads.txt),2 )
                        close(grads.txt)
      '!remove  grads.txt'
    else
        envar = NULL
    endif

* Remove TAG parameter from result
* --------------------------------
   if( tag != '' )
    'numargs 'envar
     num    = result
     result = ''
          n = 2
     while( n<=num )
       result = result' 'subwrd(envar,n)
            n = n+1
     endwhile
   else
     result = envar
   endif

return result