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+.\" Copyright (c) 2018 Yubico AB. 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+.\" HOLDER 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.
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.Dd $Mdocdate: May 25 2018 $
+.Dt FIDO_STRERR 3
+.Os
+.Sh NAME
+.Nm fido_strerr
+.Nd FIDO2 error codes
+.Sh SYNOPSIS
+.In fido.h
+.Ft const char *
+.Fn fido_strerr "int n"
+.Sh DESCRIPTION
+The
+.Fn fido_strerr
+function translates the error code
+.Fa n
+into a readable string,
+where
+.Fa n
+is an error code defined in
+.In fido/err.h .
+.Fn fido_strerr
+never returns NULL.
+Returned pointers point to static strings.