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+.Dd January 15, 2017
+.Dt GZOFFSET 3
+.Os
+.
+.Sh NAME
+.Nm gzoffset
+.Nd offset in compressed file
+.
+.Sh LIBRARY
+.Lb libz
+.
+.Sh SYNOPSIS
+.In zlib.h
+.Ft z_off_t
+.Fn gzoffset "gzFile file"
+.
+.Sh DESCRIPTION
+Returns the current offset
+in the file being read or written.
+This offset includes
+the count of bytes
+that precede the gzip stream,
+for example when appending
+or when using
+.Xr gzdopen 3
+for reading.
+When reading,
+the offset does not include
+as yet unused buffered input.
+This information can be used
+for a progress indicator.
+.
+.Sh RETURN VALUES
+On error,
+.Fn gzoffset
+returns -1.
+.
+.Sh SEE ALSO
+.Xr gzerror 3 ,
+.Xr gzopen 3 ,
+.Xr gzseek 3
+.
+.Sh HISTORY
+This manual page was converted from
+.In zlib.h
+to mdoc format by
+.An C. McEnroe Aq Mt june@causal.agency .
+.
+.Sh AUTHORS
+.An Jean-loup Gailly Aq Mt jloup@gzip.org
+.An Mark Adler Aq Mt madler@alumni.caltech.edu