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-.\"	$NetBSD: zopen.3,v 1.7 2003/08/07 11:13:29 agc Exp $
-.\"
-.\" Copyright (c) 1992, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)zopen.3	8.1 (Berkeley) 6/9/93
-.\"
-.Dd June 9, 1993
-.Dt ZOPEN 3
-.Os
-.Sh NAME
-.Nm zopen
-.Nd compressed stream open function
-.Sh SYNOPSIS
-.In stdio.h
-.Ft FILE *
-.Fn zopen "const char *path" "const char *mode" "int bits"
-.Sh DESCRIPTION
-The
-.Fn zopen
-function
-opens the compressed file whose name is the string pointed to by
-.Fa path
-and associates a stream with it.
-.Pp
-The argument
-.Fa mode
-points to one of the following one-character strings:
-.Bl -tag -width indent
-.It Dq Li r
-Open compressed file for reading.
-The stream is positioned at the beginning of the file.
-.It Dq Li w
-Truncate file to zero length or create compressed file for writing.
-The stream is positioned at the beginning of the file.
-.El
-.Pp
-Any created files will have mode
-.Pf \\*q Dv S_IRUSR
-\&|
-.Dv S_IWUSR
-\&|
-.Dv S_IRGRP
-\&|
-.Dv S_IWGRP
-\&|
-.Dv S_IROTH
-\&|
-.Dv S_IWOTH Ns \\*q
-.Pq Li 0666 ,
-as modified by the process'
-umask value (see
-.Xr umask 2 ) .
-.Pp
-Files may only be read or written.
-Seek operations are not allowed.
-.Pp
-The
-.Fa bits
-argument, if non-zero, is set to the bits code limit.
-If zero, the default is 16.
-See
-.Fn compress 1
-for more information.
-.Sh RETURN VALUES
-Upon successful completion
-.Fn zopen
-returns a
-.Tn FILE
-pointer.
-Otherwise,
-.Dv NULL
-is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width [EINVAL]
-.It Bq Er EINVAL
-The
-.Fa mode
-or
-.Fa bits
-arguments specified to
-.Fn zopen
-were invalid.
-.It Bq Er EFTYPE
-The compressed file starts with an invalid header, or the compressed
-file is compressed with more bits than can be handled.
-.El
-.Pp
-The
-.Fn zopen
-function may also fail and set
-.Va errno
-for any of the errors specified for the routines
-.Xr fopen 3
-or
-.Xr funopen 3 .
-.Sh SEE ALSO
-.Xr compress 1 ,
-.Xr fopen 3 ,
-.Xr funopen 3
-.Sh HISTORY
-The
-.Nm zopen
-function
-first appeared in
-.Bx 4.4 .
-.Sh BUGS
-The
-.Fn zopen
-function
-may not be portable to systems other than
-.Bx .