VMS Help PASCAL, Predeclared Routines, Allocation  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The allocation  size  routines  provide  information  about  the
  amount  of  storage  allocated  for  variables and components of
  various types.  The parameters may be in the form of variable or
  type  identifiers.   Each  routine returns an integer value that
  represents the allocation size of the given parameter.

1 - BITNEXT

  The BITNEXT function returns an integer value that indicates the
  number  of bits that would be allocated for one component of the
  specified type in a packed array or if  the  specified  variable
  appeared as a cell in a packed array.

  Syntax:

     BITNEXT( x )

  The parameter 'x' can be a variable or any type identifier.

2 - BITSIZE

  The BITSIZE function returns an integer value that indicates the
  number  of  bits  that  would  be allocated for one field of the
  specified type in a packed record or if the  specified  variable
  appeared as a field in a packed record.

  Syntax:

  BITSIZE( x )

  The parameter 'x' can be a variable or any type identifier.

3 - BIT_OFFSET

  The BIT_OFFSET function returns an integer value that represents
  the bit position of a field in a record.

  Syntax:

     BIT_OFFSET( t,f )

  The parameter 't' can be of any record type or variable, and the
  parameter 'f' can be any field contained in that record.

4 - BYTE_OFFSET

  The  BYTE_OFFSET  function  returns  an   integer   value   that
  represents the byte position of a field in a record.

  Syntax:

     BYTE_OFFSET( t,f )

  The parameter 't' can be of any record type or variable, and the
  parameter 'f' can be any field contained in that record.

5 - NEXT

  The NEXT function returns an integer value  that  indicates  the
  number of bytes that would be allocated for one component of the
  specified type in an unpacked array or if the specified variable
  appeared as the cell in an unpacked array.

  Syntax:

     NEXT( x )

  The parameter 'x' can be a type identifier or variable.

  Cells in an unpacked array are affected by alignment  attributes
  and,  by default, are byte or naturally aligned.  Therefore, the
  size returned includes the actual size of the type or  variable,
  in   addition  to  trailing  space  required  to  ensure  proper
  alignment.

6 - SIZE

  The SIZE function returns an integer value  that  indicates  the
  possible  or  actual  number  of  bytes that are allocated for a
  specified data type or variable.

  Syntax:

     SIZE( x[[,t1,...,tn]] )

  The parameter 'x' can be a type identifier or  a  variable.   If
  'x'  is  a  type  identifier, then SIZE returns an integer value
  which indicates the number of bytes that would be allocated  for
  a variable or record field of type 'x'.

  If 'x' is a variable, then SIZE returns an  integer  value  that
  indicates  the  number  of  bytes  that  are  allocated for that
  variable.

  In the case where the parameter 'x' is a variant record variable
  or  variant  type identifier, SIZE returns an integer value that
  indicates the number of bytes that are allocated (for a  variant
  record  variable)  or  would  be  allocated  (for a variant type
  identifier) for both the fixed portion of  the  record  and  the
  largest   variant.    In  addition  you  can  supply  additional
  parameters t1 through tn that correspond to the case  labels  of
  the  record.   The  SIZE  routine  returns an integer value that
  indicates the number of bytes that would be allocated by the NEW
  procedure for a dynamic variable of the specified variant.