.\" zip_set_file_comment.mdoc -- set comment for file in zip
.\" Copyright (C) 2006-2012 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP files.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd February 20, 2012
.Dt ZIP_SET_FILE_COMMENT 3
.Os
.Sh NAME
.Nm zip_set_file_comment
.Nd set comment for file in zip
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft int
.Fn zip_set_file_comment "struct zip *archive" "zip_uint64_t index" \
"const char *comment" "int len"
.Sh DESCRIPTION
The
.Fn zip_set_file_comment
function sets the comment for the file at position
.Ar index
in the zip archive to
.Ar comment
of length
.Ar len .
If
.Ar comment
is
.Dv NULL
and
.Ar len
is 0, the file comment will be removed.
.Ar comment
must be encoded in ASCII or UTF-8.
.Sh RETURN VALUES
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error information in
.Ar archive
is set to indicate the error.
.Sh ERRORS
.Fn zip_set_file_comment
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_ENCMISMATCH
The file name is encoded in CP437 and the file comment is in UTF-8.
Workaround: see
.Xr zip_rename 3 .
.It Bq Er ZIP_ER_INVAL
.Ar index
is not a valid file index in
.Ar archive ,
or
.Ar len
is less than 0 or longer than the maximum comment length in a zip file
(65535), or
.Ar comment
is not a valid UTF-8 encoded string.
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_get_archive_comment 3 ,
.Xr zip_get_file_comment 3 ,
.Xr zip_set_archive_comment 3
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq dillo@giga.or.at
and
.An Thomas Klausner Aq tk@giga.or.at