Function:	fts_skipfil

Purpose:	Skip FITS files forwards or backwards.

Category:	FITS

File:		fts_io.c

Author: 	Peter Roelfsema

Use:		FTS_SKIPFIL( MTID,	input		INTEGER,
			     NSKIP )	input/output	INTEGER.

		FTS_SKIPFIL Returns:
			   >0 - the absolute number of files skipped
		    -1 .. -10 - tape error (see MTIODEV.DC2)
			  -13 - Begin of tape (NSKIP < 0 )
			      - End of tape (NSKIP > 0 )
		MTID	 A device ID as obtained from MTOPEN
		NSKIP	 Number of files to skip forward (NSKIP>0) or
			 backward (NSKIP<0). NSKIP=0 will result in a
			 skip to begin of current file.

Description:

	FTS_SKIPFIL Skips nskip FITS files.
	 Returned is the number of files skipped or some error as detected by
	tape io routines.  If tape contains less then nskip files, the number
	returned is smaller than nskip!

Updates:
	Oct 29, 1990: PRR, Original document.