float nextafterf(float, float);
/* 7.12.12 maximum, minimum, positive difference */
+double fdim(double, double);
+float fdimf(float, float);
+long double fdiml(long double, long double);
+
double fmax(double, double);
float fmaxf(float, float);
long double fmaxl(long double, long double);
.PATH: ${.CURDIR}/man
MAN+= acos.3 acosh.3 asin.3 asinh.3 atan.3 atan2.3 atanh.3 ceil.3 \
- cos.3 cosh.3 erf.3 exp.3 fabs.3 feclearexcept.3 feenableexcept.3 \
+ cos.3 cosh.3 erf.3 exp.3 fabs.3 fdim.3 feclearexcept.3 feenableexcept.3 \
fegetenv.3 fegetround.3 fenv.3 floor.3 fmax.3 fmod.3 hypot.3 ieee.3 \
ieee_test.3 j0.3 lgamma.3 math.3 rint.3 round.3 sin.3 \
sinh.3 sqrt.3 tan.3 tanh.3 trunc.3
exp.3 log10.3 exp.3 log10f.3 exp.3 log1p.3 exp.3 log1pf.3 exp.3 log2.3 \
exp.3 log2f.3 exp.3 pow.3 exp.3 powf.3
MLINKS+=fabs.3 fabsf.3
+MLINKS+=fdim.3 fdimf.3 fdim.3 fdiml.3
MLINKS+=feclearexcept.3 fegetexceptflag.3 feclearexcept.3 feraiseexcept.3 \
feclearexcept.3 fesetexceptflag.3 feclearexcept.3 fetestexcept.3
MLINKS+=feenableexcept.3 fedisableexcept.3 feenableexcept.3 fegetexcept.3
--- /dev/null
+.\" Copyright (c) 2004 David Schultz <das@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.
+.\"
+.Dd June 1, 2009
+.Dt FDIM 3
+.Os
+.Sh NAME
+.Nm fdim ,
+.Nm fdimf ,
+.Nm fdiml
+.Nd positive difference functions
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft double
+.Fn fdim "double x" "double y"
+.Ft float
+.Fn fdimf "float x" "float y"
+.Ft long double
+.Fn fdiml "long double x" "long double y"
+.Sh DESCRIPTION
+The
+.Fn fdim ,
+.Fn fdimf ,
+and
+.Fn fdiml
+functions return the positive difference between
+.Fa x
+and
+.Fa y .
+That is, if
+.Fa x\- Ns Fa y
+is positive, then
+.Fa x\- Ns Fa y
+is returned.
+If either
+.Fa x
+or
+.Fa y
+is an \*(Na, then an \*(Na is returned.
+Otherwise, the result is
+.Li +0.0 .
+.Pp
+Overflow or underflow may occur iff the exact result is not
+representable in the return type.
+No other exceptions are raised.
+.Sh SEE ALSO
+.Xr fabs 3 ,
+.Xr fmax 3 ,
+.Xr fmin 3 ,
+.Xr math 3
+.Sh STANDARDS
+The
+.Fn fdim ,
+.Fn fdimf ,
+and
+.Fn fdiml
+functions conform to
+.St -isoC-99 .
+.Sh HISTORY
+These routines first appeared in
+.Dx 2.3 .
e_sinh.c e_sinhf.c e_sqrt.c e_sqrtf.c \
s_asinh.c s_asinhf.c s_atan.c s_atanf.c s_cbrt.c s_cbrtf.c s_ceil.c \
s_ceilf.c s_copysign.c s_copysignf.c s_cos.c s_cosf.c s_erf.c \
- s_erff.c s_expm1.c s_expm1f.c s_fabsf.c s_finite.c \
+ s_erff.c s_expm1.c s_expm1f.c s_fabsf.c s_fdim.c s_finite.c \
s_finitef.c s_floor.c s_floorf.c s_fmax.c s_fmaxf.c s_fmaxl.c \
s_fmin.c s_fminf.c s_fminl.c s_frexpf.c s_frexpl.c s_ilogb.c \
s_ilogbf.c s_ldexpf.c s_log1p.c s_log1pf.c s_logb.c s_logbf.c \
--- /dev/null
+/*-
+ * Copyright (c) 2004 David Schultz <das@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.
+ */
+
+#include <sys/cdefs.h>
+
+#include <math.h>
+
+#define DECL(type, fn) \
+type \
+fn(type x, type y) \
+{ \
+ \
+ if (isnan(x)) \
+ return (x); \
+ if (isnan(y)) \
+ return (y); \
+ return (x > y ? x - y : 0.0); \
+}
+
+DECL(double, fdim)
+DECL(float, fdimf)
+DECL(long double, fdiml)
projects / dragonfly.git / commitdiff