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@(#)zopen.3 8.1 (Berkeley) 6/9/93
$FreeBSD: releng/11.0/usr.bin/compress/zopen.3 216370 2010-12-11 08:32:16Z joel $
.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.
p The argument .Fa mode points to one of the following one-character strings: l -tag -width indent t Dq Li r Open compressed file for reading. The stream is positioned at the beginning of the file. t 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
p Any created files will have mode
f \\*q Dv S_IRUSR | .Dv S_IWUSR | .Dv S_IRGRP | .Dv S_IWGRP | .Dv S_IROTH | .Dv S_IWOTH Ns \\*q
q Li 0666 , as modified by the process' umask value (see .Xr umask 2 ) .
p Files may only be read or written. Seek operations are not allowed.
p 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 l -tag -width [EINVAL] t Bq Er EINVAL The .Fa mode or .Fa bits arguments specified to .Fn zopen were invalid. t 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
p 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 x 4.4 . .Sh BUGS The .Fn zopen function may not be portable to systems other than x .