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.Dd January 15, 2017
.Dt GZFWRITE 3
.Os
.
.Sh NAME
.Nm gzfwrite
.Nd write to compressed file
.
.Sh LIBRARY
.Lb libz
.
.Sh SYNOPSIS
.In zlib.h
.Ft z_size_t
.Fn gzfwrite "voidpc buf" "z_size_t size" "z_size_t nitems" "gzFile file"
.
.Sh DESCRIPTION
.Fn gzfwrite
writes
.Fa nitems
items of size
.Fa size
from
.Fa buf
to
.Fa file ,
duplicating the interface of stdio's
.Xr fwrite 3 ,
with
.Vt size_t
request and return types.
If the library defines
.Vt size_t ,
then
.Vt z_size_t
is identical to
.Vt size_t .
If not,
then
.Vt z_size_t
is an unsigned integer type
that can contain a pointer.
.
.Sh RETURN VALUES
.Fn gzfwrite
returns the number of full items
written of size
.Fa size ,
or zero if there was an error.
If the multiplication of
.Fa size
and
.Fa nitems
overflows,
i.e. the product does not fit in a
.Vt z_size_t ,
then nothing is written,
zero is returned,
and the error state is set to
.Dv Z_STREAM_ERROR .
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