FXHREAD

       Reads a FITS header from an opened disk file.

       Reads a FITS header from an opened disk file.

       FXHREAD, UNIT, HEADER  [, STATUS ]

       UNIT    = Logical unit number.

       HEADER  = String array containing the FITS header.

       STATUS  = Condition code giving the status of the read.  Normally, this
                 is zero, but is set to !ERR if an error occurs, or if the
                 first byte of the header is zero (ASCII null).

       None.

       None.

       None.

       The file must already be positioned at the start of the header.  It
       must be a proper FITS file.

       The file ends by being positioned at the end of the FITS header, unless
       an error occurs.

       Data Handling, I/O, FITS, Generic.

       W. Thompson, Feb 1992, from READFITS by J. Woffard and W. Landsman.
       W. Thompson, Aug 1992, added test for SIMPLE keyword.

       William Thompson, GSFC, February 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.

       Version 1, 12 April 1993.
       Converted to IDL V5.0   W. Landsman   September 1997

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