/usr/share/gnudatalanguage/coyote/undefine.pro is in gdl-coyote 2016.11.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; NAME:
; UNDEFINE
;
; PURPOSE:
; The purpose of this program is to delete or undefine
; an IDL program variable from within an IDL program or
; at the IDL command line. It is a more powerful DELVAR.
; Pointer and structure variables are traversed recursively
; to undefine any variables pointed to in the pointer or in
; a structure dereference.
;
; AUTHOR:
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1642 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; CATEGORY:
; Utilities.
;
; CALLING SEQUENCE:
; UNDEFINE, variable
;
; REQUIRED INPUTS:
; variable: The variable to be deleted. Up to 10 variables may be specified as arguments.
;
; SIDE EFFECTS:
; The variable no longer exists.
;
; EXAMPLE:
; To delete the variable "info", type:
;
; IDL> Undefine, info
;
; IDL> var = ptr_new({a:ptr_New(5), b:findgen(11), c: {d:ptr_New(10), f:findgen(11)}})
; IDL> Help, /Heap
; Heap Variables:
; # Pointer: 3
; # Object : 0
; <PtrHeapVar3> LONG = 5
; <PtrHeapVar4> LONG = 10
; <PtrHeapVar5> STRUCT = -> <Anonymous> Array[1]
;
; IDL> Undefine, var
; IDL> Help, /Heap
; Heap Variables:
; # Pointer: 0
; # Object : 0
; IDL> Help, var
; VAR UNDEFINED = <Undefined>
;
; MODIFICATION HISTORY:
; Written by David W. Fanning, 8 June 97, from an original program
; given to me by Andrew Cool, DSTO, Adelaide, Australia.
; Simplified program so you can pass it an undefined variable. :-) 17 May 2000. DWF
; Simplified it even more by removing the unnecessary SIZE function. 28 June 2002. DWF.
; Added capability to delete up to 10 variables at suggestion of Craig Markwardt. 10 Jan 2008. DWF.
; If the variable is a pointer, object or structure reference the variable is recursively traversed
; to free up all variables pointed to before the variable is itself destroyed. 10 June 2009. DWF.
; Updated to allow undefining of pointer arrays. 8 October 2009. DWF.
; Valid pointers that point to undefined variable can cause an infinite loop. Now using
; Heap_Free, rather than recursion, with pointers. 30 May 2013. DWF.
;-
;******************************************************************************************;
; Copyright (c) 2008 - 2009, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
PRO UNDEFINE, var0, var1, var2, var3, var4, var5, var6, var7, var8, var9
IF N_Elements(var0) NE 0 THEN BEGIN
dataType = Size(var0, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var0)-1 DO BEGIN
IF Ptr_Valid(var0[j]) THEN Heap_Free, var0[j]
Ptr_Free, var0[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var0
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var0)-1 DO Undefine, var0.(j)
var0 = 0
dummy = Temporary(var0)
ENDIF
IF N_Elements(var1) NE 0 THEN BEGIN
dataType = Size(var1, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var1)-1 DO BEGIN
IF Ptr_Valid(var1[j]) THEN Heap_Free, *var1[j]
Ptr_Free, var1[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var1
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var1)-1 DO Undefine, var1.(j)
var1 = 0
dummy = Temporary(var1)
ENDIF
IF N_Elements(var2) NE 0 THEN BEGIN
dataType = Size(var2, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var2)-1 DO BEGIN
IF Ptr_Valid(var2[j]) THEN Heap_Free, *var2[j]
Ptr_Free, var2[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var2
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var2)-1 DO Undefine, var2.(j)
var2 = 0
dummy = Temporary(var2)
ENDIF
IF N_Elements(var3) NE 0 THEN BEGIN
dataType = Size(var3, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var3)-1 DO BEGIN
IF Ptr_Valid(var3[j]) THEN Heap_Free, *var3[j]
Ptr_Free, var3[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var3
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var3)-1 DO Undefine, var3.(j)
var3 = 0
dummy = Temporary(var3)
ENDIF
IF N_Elements(var4) NE 0 THEN BEGIN
dataType = Size(var4, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var4)-1 DO BEGIN
IF Ptr_Valid(var4[j]) THEN Heap_Free, *var4[j]
Ptr_Free, var4[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var4
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var4)-1 DO Undefine, var4.(j)
var4 = 0
dummy = Temporary(var4)
ENDIF
IF N_Elements(var5) NE 0 THEN BEGIN
dataType = Size(var5, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var5)-1 DO BEGIN
IF Ptr_Valid(var5[j]) THEN Heap_Free, *var5[j]
Ptr_Free, var5[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var5
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var5)-1 DO Undefine, var5.(j)
var5 = 0
dummy = Temporary(var5)
ENDIF
IF N_Elements(var6) NE 0 THEN BEGIN
dataType = Size(var6, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var6)-1 DO BEGIN
IF Ptr_Valid(var6[j]) THEN Heap_Free, *var6[j]
Ptr_Free, var6[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var6
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var6)-1 DO Undefine, var6.(j)
var6 = 0
dummy = Temporary(var6)
ENDIF
IF N_Elements(var7) NE 0 THEN BEGIN
dataType = Size(var7, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var7)-1 DO BEGIN
IF Ptr_Valid(var7[j]) THEN Heap_Free, *var7[j]
Ptr_Free, var7[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var7
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var7)-1 DO Undefine, var7.(j)
var7 = 0
dummy = Temporary(var7)
ENDIF
IF N_Elements(var8) NE 0 THEN BEGIN
dataType = Size(var8, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var8)-1 DO BEGIN
IF Ptr_Valid(var8[j]) THEN Heap_Free, *var8[j]
Ptr_Free, var8[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var8
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var8)-1 DO Undefine, var8.(j)
var8 = 0
dummy = Temporary(var8)
ENDIF
IF N_Elements(var9) NE 0 THEN BEGIN
dataType = Size(var9, /TNAME)
IF dataType EQ 'POINTER' THEN BEGIN
FOR j=0L,N_Elements(var9)-1 DO BEGIN
IF Ptr_Valid(var9[j]) THEN Heap_Free, *var9[j]
Ptr_Free, var9[j]
ENDFOR
ENDIF
IF dataType EQ 'OBJREF' THEN Obj_Destroy, var9
IF dataType EQ 'STRUCT' THEN FOR j=0,N_Tags(var9)-1 DO Undefine, var9.(j)
var9 = 0
dummy = Temporary(var9)
ENDIF
END
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