.\" zip_file_set_comment.mdoc -- set comment for file in zip
.\" Copyright (C) 2006-2017 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 December 18, 2017
.Dt ZIP_FILE_SET_COMMENT 3
.Os
.Sh NAME
.Nm zip_file_set_comment
.Nd set comment for file in zip
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft int
.Fn zip_file_set_comment "zip_t *archive" "zip_uint64_t index" "const char *comment" "zip_uint16_t len" "zip_flags_t flags"
.Sh DESCRIPTION
The
.Fn zip_file_set_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.
The
.Ar flags
argument can be any of:
.Bl -tag -width XZIPXFLXENCXSTRICTXX
.It Dv ZIP_FL_ENC_GUESS
Guess encoding of
.Ar comment
(default).
.It Dv ZIP_FL_ENC_UTF_8
Interpret
.Ar comment
as UTF-8.
.It Dv ZIP_FL_ENC_CP437
Interpret
.Ar comment
as code page 437 (CP-437).
.El
.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_file_set_comment
fails if:
.Bl -tag -width Er
.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.
.It Bq Er ZIP_ER_RDONLY
The
.Ar archive
was opened in read-only mode.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_file_get_comment 3 ,
.Xr zip_get_archive_comment 3 ,
.Xr zip_set_archive_comment 3
.Sh HISTORY
.Fn zip_file_set_comment
was added in libzip 0.11.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at