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.\" $OpenBSD: strtofflags.3,v 1.6 2007/05/31 19:19:28 jmc Exp $
.\"
.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)setmode.3 8.2 (Berkeley) 4/28/95
.\" $FreeBSD: src/lib/libc/gen/strtofflags.3,v 1.5 2000/06/17 11:09:24 joe Exp $
.\"
.Dd $Mdocdate: May 31 2007 $
.Dt STRTOFFLAGS 3
.Os
.Sh NAME
.Nm fflagstostr ,
.Nm strtofflags
.Nd convert between file flag bits and their string names
.Sh SYNOPSIS
.Fd #include <unistd.h>
.Ft char *
.Fn fflagstostr "u_int32_t flags"
.Ft int
.Fn strtofflags "char **stringp" "u_int32_t *setp" "u_int32_t *clrp"
.Sh DESCRIPTION
The
.Fn fflagstostr
function returns a comma separated string of the file flags represented by
.Fa flags .
If no flags are set, a zero length string is returned.
.Pp
If memory cannot be allocated for the return value,
.Fn fflagstostr
returns
.Dv NULL .
.Pp
The value returned from
.Fn fflagstostr
is obtained from
.Xr malloc 3
and should be returned to the system with
.Xr free 3
when the program is done with it.
.Pp
The
.Fn strtofflags
function takes a string of file flags, as described in
.Xr chflags 1 ,
parses it, and returns the
.Dq set
and
.Dq clear
flags such as would be given as arguments to
.Xr chflags 2 .
On success,
.Fn strtofflags
returns 0, otherwise it returns non-zero and
.Fa stringp
is left pointing to the offending token.
.Sh ERRORS
The
.Fn fflagstostr
function may fail and set
.Va errno
for any of the errors specified for the library routine
.Xr malloc 3 .
.Sh SEE ALSO
.Xr chflags 1 ,
.Xr chflags 2 ,
.Xr malloc 3
.Sh HISTORY
The
.Fn fflagstostr
and
.Fn strtofflags
functions first appeared in
.Ox 2.8 .
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