140 lines
3.7 KiB
Groff
140 lines
3.7 KiB
Groff
.\" Copyright (c) 1992, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)zopen.3 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt ZOPEN 3
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.Os
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.Sh NAME
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.Nm zopen
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.Nd compressed stream open function
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.Sh SYNOPSIS
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.Fd #include <stdio.h>
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.Ft FILE *
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.Fn zopen "const char *path" "const char *mode" "int bits"
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.Sh DESCRIPTION
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The
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.Fn zopen
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function
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opens the compressed file whose name is the string pointed to by
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.Fa path
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and associates a stream with it.
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.Pp
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The argument
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.Fa mode
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points to one of the following one-character strings:
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.Bl -tag -width indent
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.It Dq Li r
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Open compressed file for reading.
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The stream is positioned at the beginning of the file.
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.It Dq Li w
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Truncate file to zero length or create compressed file for writing.
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The stream is positioned at the beginning of the file.
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.El
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.Pp
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Any created files will have mode
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.Pf \\*q Dv S_IRUSR
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\&|
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.Dv S_IWUSR
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\&|
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.Dv S_IRGRP
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\&|
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.Dv S_IWGRP
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\&|
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.Dv S_IROTH
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\&|
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.Dv S_IWOTH Ns \\*q
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.Pq Li 0666 ,
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as modified by the process'
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umask value (see
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.Xr umask 2 ) .
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.Pp
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Files may only be read or written.
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Seek operations are not allowed.
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.Pp
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The
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.Fa bits
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argument, if non-zero, is set to the bits code limit.
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If zero, the default is 16.
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See
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.Fn compress 1
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for more information.
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.Sh RETURN VALUES
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Upon successful completion
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.Fn zopen
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returns a
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.Tn FILE
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pointer.
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Otherwise,
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.Dv NULL
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is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Bl -tag -width [EINVAL]
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.It Bq Er EINVAL
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The
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.Fa mode
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or
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.Fa bits
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arguments specified to
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.Fn zopen
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were invalid.
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.It Bq Er EFTYPE
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The compressed file starts with an invalid header, or the compressed
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file is compressed with more bits than can be handled.
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.El
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.Pp
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The
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.Fn zopen
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function may also fail and set
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.Va errno
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for any of the errors specified for the routines
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.Xr fopen 3
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or
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.Xr funopen 3 .
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.Sh SEE ALSO
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.Xr compress 1 ,
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.Xr fopen 3 ,
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.Xr funopen 3
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.Sh HISTORY
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The
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.Nm zopen
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function
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first appeared in 4.4BSD.
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.Sh BUGS
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The
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.Fn zopen
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function
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may not be portable to systems other than
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.Bx .
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