87 lines
2.7 KiB
Groff
87 lines
2.7 KiB
Groff
.\" Copyright (c) 1991 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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 6.3 (Berkeley) 4/19/91
|
|
.\"
|
|
.Dd April 19, 1991
|
|
.Dt ASSERT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm assert
|
|
.Nd expression verification macro
|
|
.Sh SYNOPSIS
|
|
.Fd #include <assert.h>
|
|
.Fn assert expression
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn assert
|
|
macro tests the given
|
|
.Ar expression
|
|
and if it is false,
|
|
the calling process is terminated.
|
|
A
|
|
diagnostic message is written to
|
|
.Em stderr
|
|
and the
|
|
.Xr abort 3
|
|
function is called, effectively terminating the program.
|
|
.Pp
|
|
If
|
|
.Ar expression
|
|
is true,
|
|
the
|
|
.Fn assert
|
|
macro does nothing.
|
|
.Pp
|
|
The
|
|
.Fn assert
|
|
macro
|
|
may be removed at compile time with
|
|
the
|
|
.Fl NDEBUG
|
|
option, see
|
|
.Xr cc 1 .
|
|
.Sh DIAGNOSTICS
|
|
The following diagnostic message is written to
|
|
.Em stderr
|
|
if
|
|
.Ar 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 STANDARDS
|
|
The
|
|
.Fn assert
|
|
macro conforms to
|
|
.St -ansiC .
|