.\" zip_unchange.mdoc -- undo changes to file in zip archive
.\" Copyright (C) 2003-2017 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd December 18, 2017
.Dt ZIP_UNCHANGE 3
.Os
.Sh NAME
.Nm zip_unchange
.Nd undo changes to file in zip archive
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft int
.Fn zip_unchange "zip_t *archive" "zip_uint64_t index"
.Sh DESCRIPTION
Changes to the file at position
.Ar index
are reverted.
.Sh RETURN VALUES
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error code in
.Ar archive
is set to indicate the error.
.Sh ERRORS
.Fn zip_unchange
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_EXISTS
Unchanging the name would result in a duplicate name in the archive.
.It Bq Er ZIP_ER_INVAL
.Ar index
is not a valid file index in
.Ar zip .
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_unchange_all 3 ,
.Xr zip_unchange_archive 3
.Sh HISTORY
.Fn zip_unchange
was added in libzip 0.6.
In libzip 0.10 the type of
.Ar index
was changed from
.Vt int
to
.Vt zip_uint64_t .
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at