142 lines
3.7 KiB
Groff
142 lines
3.7 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 9, 1993
|
|
.Dt ZOPEN 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm zopen
|
|
.Nd compressed stream open function
|
|
.Sh SYNOPSIS
|
|
.Fd #include "zopen.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
|
|
.Xr 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
|
|
function
|
|
first appeared in
|
|
.Bx 4.4 .
|
|
.Sh BUGS
|
|
The
|
|
.Fn zopen
|
|
function
|
|
may not be portable to systems other than
|
|
.Bx .
|