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+.\"	$OpenBSD: assert.3,v 1.10 2014/12/10 21:15:30 schwarze Exp $
+.\"	$NetBSD: assert.3,v 1.5 1994/11/30 15:24:30 jtc Exp $
+.\"
+.\" Copyright (c) 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.
+.\"
+.\"     @(#)assert.3	8.1 (Berkeley) 6/9/93
+.\"
+.Dd $Mdocdate: December 10 2014 $
+.Dt ASSERT 3
+.Os
+.Sh NAME
+.Nm assert
+.Nd expression verification macro
+.Sh SYNOPSIS
+.In assert.h
+.Fn assert expression
+.Sh DESCRIPTION
+The
+.Fn assert
+macro tests the given
+.Fa expression
+and if it is false, the calling process is terminated.
+A diagnostic message is written to
+.Dv stderr
+and the
+.Xr abort 3
+function is called, effectively terminating the program.
+.Pp
+If
+.Fa expression
+is true, the
+.Fn assert
+macro does nothing.
+.Pp
+The
+.Fn assert
+macro may be removed at compile time with the
+.Xr cc 1
+option
+.Fl DNDEBUG .
+.Sh DIAGNOSTICS
+The following diagnostic message is written to
+.Dv stderr
+if
+.Fa expression
+is false:
+.Bd -literal -offset indent
+"assertion \e"%s\e" failed: file \e"%s\e", line %d\en", \e
+		    "expression", __FILE__, __LINE__);
+.Ed
+.Sh SEE ALSO
+.Xr cc 1 ,
+.Xr abort 3
+.Sh STANDARDS
+The
+.Fn assert
+macro conforms to
+.St -ansiC .
+.Sh HISTORY
+An
+.Fn assert
+macro first appeared in
+.At v7 .