Fix two bugs in the signbit() macro, which was implemented last year:

- It was added to libc instead of libm.  Hopefully no programs rely
  on this mistake.

- It didn't work properly on large long doubles because its argument
  was converted to type double, resulting in undefined behavior.

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/msun/man/signbit.3 b/lib/msun/man/signbit.3
new file mode 100644
index 0000000..dd0a39f
--- /dev/null
+++ b/lib/msun/man/signbit.3
@@ -0,0 +1,57 @@
+.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
+.\" 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 AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 18, 2004
+.Dt SIGNBIT 3
+.Os
+.Sh NAME
+.Nm signbit
+.Nd "determine whether a floating-point number's sign is negative"
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft int
+.Fn signbit "real-floating x"
+.Sh DESCRIPTION
+The
+.Fn signbit
+macro takes an argument of
+.Fa x
+and returns non-zero if the value of its sign is negative, otherwise 0.
+.Sh SEE ALSO
+.Xr fpclassify 3 ,
+.Xr math 3
+.Sh STANDARDS
+The
+.Fn signbit
+macro conforms to
+.St -isoC-99 .
+.Sh HISTORY
+The
+.Fn signbit
+macro was added in
+.Fx 5.1 .