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author | mike <mike@FreeBSD.org> | 2003-02-11 21:56:21 +0000 |
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committer | mike <mike@FreeBSD.org> | 2003-02-11 21:56:21 +0000 |
commit | b56a102d98cd205397bde43f1b2a9ac119f0028d (patch) | |
tree | b8970625bfd29f2ebf574f2547dab4599320a895 /lib/libc/gen/signbit.c | |
parent | b65dfed25b7d235dd26e37e6b7cf060f70360438 (diff) | |
download | FreeBSD-src-b56a102d98cd205397bde43f1b2a9ac119f0028d.zip FreeBSD-src-b56a102d98cd205397bde43f1b2a9ac119f0028d.tar.gz |
Implement C99's signbit() macro.
Diffstat (limited to 'lib/libc/gen/signbit.c')
-rw-r--r-- | lib/libc/gen/signbit.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/libc/gen/signbit.c b/lib/libc/gen/signbit.c new file mode 100644 index 0000000..02b48ee --- /dev/null +++ b/lib/libc/gen/signbit.c @@ -0,0 +1,40 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#include <math.h> + +#include "fpmath.h" + +int +__signbit(double d) +{ + union IEEEd2bits u; + + u.d = d; + return (u.bits.sign); +} |