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-rw-r--r--ruby_1_8_6/math.c529
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diff --git a/ruby_1_8_6/math.c b/ruby_1_8_6/math.c
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--- a/ruby_1_8_6/math.c
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-/**********************************************************************
-
- math.c -
-
- $Author$
- $Date$
- created at: Tue Jan 25 14:12:56 JST 1994
-
- Copyright (C) 1993-2003 Yukihiro Matsumoto
-
-**********************************************************************/
-
-#include "ruby.h"
-#include <math.h>
-#include <errno.h>
-
-VALUE rb_mMath;
-
-#define Need_Float(x) (x) = rb_Float(x)
-#define Need_Float2(x,y) do {\
- Need_Float(x);\
- Need_Float(y);\
-} while (0)
-
-static void
-domain_check(x, msg)
- double x;
- char *msg;
-{
- while(1) {
- if (errno) {
- rb_sys_fail(msg);
- }
- if (isnan(x)) {
-#if defined(EDOM)
- errno = EDOM;
-#elif defined(ERANGE)
- errno = ERANGE;
-#endif
- continue;
- }
- break;
- }
-}
-
-
-/*
- * call-seq:
- * Math.atan2(y, x) => float
- *
- * Computes the arc tangent given <i>y</i> and <i>x</i>. Returns
- * -PI..PI.
- *
- */
-
-static VALUE
-math_atan2(obj, y, x)
- VALUE obj, x, y;
-{
- Need_Float2(y, x);
- return rb_float_new(atan2(RFLOAT(y)->value, RFLOAT(x)->value));
-}
-
-
-/*
- * call-seq:
- * Math.cos(x) => float
- *
- * Computes the cosine of <i>x</i> (expressed in radians). Returns
- * -1..1.
- */
-
-static VALUE
-math_cos(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(cos(RFLOAT(x)->value));
-}
-
-/*
- * call-seq:
- * Math.sin(x) => float
- *
- * Computes the sine of <i>x</i> (expressed in radians). Returns
- * -1..1.
- */
-
-static VALUE
-math_sin(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
-
- return rb_float_new(sin(RFLOAT(x)->value));
-}
-
-
-/*
- * call-seq:
- * Math.tan(x) => float
- *
- * Returns the tangent of <i>x</i> (expressed in radians).
- */
-
-static VALUE
-math_tan(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
-
- return rb_float_new(tan(RFLOAT(x)->value));
-}
-
-/*
- * call-seq:
- * Math.acos(x) => float
- *
- * Computes the arc cosine of <i>x</i>. Returns 0..PI.
- */
-
-static VALUE
-math_acos(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = acos(RFLOAT(x)->value);
- domain_check(d, "acos");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.asin(x) => float
- *
- * Computes the arc sine of <i>x</i>. Returns 0..PI.
- */
-
-static VALUE
-math_asin(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = asin(RFLOAT(x)->value);
- domain_check(d, "asin");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.atan(x) => float
- *
- * Computes the arc tangent of <i>x</i>. Returns -{PI/2} .. {PI/2}.
- */
-
-static VALUE
-math_atan(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(atan(RFLOAT(x)->value));
-}
-
-#ifndef HAVE_COSH
-double
-cosh(x)
- double x;
-{
- return (exp(x) + exp(-x)) / 2;
-}
-#endif
-
-/*
- * call-seq:
- * Math.cosh(x) => float
- *
- * Computes the hyperbolic cosine of <i>x</i> (expressed in radians).
- */
-
-static VALUE
-math_cosh(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
-
- return rb_float_new(cosh(RFLOAT(x)->value));
-}
-
-#ifndef HAVE_SINH
-double
-sinh(x)
- double x;
-{
- return (exp(x) - exp(-x)) / 2;
-}
-#endif
-
-/*
- * call-seq:
- * Math.sinh(x) => float
- *
- * Computes the hyperbolic sine of <i>x</i> (expressed in
- * radians).
- */
-
-static VALUE
-math_sinh(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(sinh(RFLOAT(x)->value));
-}
-
-#ifndef HAVE_TANH
-double
-tanh(x)
- double x;
-{
- return sinh(x) / cosh(x);
-}
-#endif
-
-/*
- * call-seq:
- * Math.tanh() => float
- *
- * Computes the hyperbolic tangent of <i>x</i> (expressed in
- * radians).
- */
-
-static VALUE
-math_tanh(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(tanh(RFLOAT(x)->value));
-}
-
-/*
- * call-seq:
- * Math.acosh(x) => float
- *
- * Computes the inverse hyperbolic cosine of <i>x</i>.
- */
-
-static VALUE
-math_acosh(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = acosh(RFLOAT(x)->value);
- domain_check(d, "acosh");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.asinh(x) => float
- *
- * Computes the inverse hyperbolic sine of <i>x</i>.
- */
-
-static VALUE
-math_asinh(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(asinh(RFLOAT(x)->value));
-}
-
-/*
- * call-seq:
- * Math.atanh(x) => float
- *
- * Computes the inverse hyperbolic tangent of <i>x</i>.
- */
-
-static VALUE
-math_atanh(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = atanh(RFLOAT(x)->value);
- domain_check(d, "atanh");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.exp(x) => float
- *
- * Returns e**x.
- */
-
-static VALUE
-math_exp(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(exp(RFLOAT(x)->value));
-}
-
-#if defined __CYGWIN__
-# include <cygwin/version.h>
-# if CYGWIN_VERSION_DLL_MAJOR < 1005
-# define nan(x) nan()
-# endif
-# define log(x) ((x) < 0.0 ? nan("") : log(x))
-# define log10(x) ((x) < 0.0 ? nan("") : log10(x))
-#endif
-
-/*
- * call-seq:
- * Math.log(numeric) => float
- *
- * Returns the natural logarithm of <i>numeric</i>.
- */
-
-static VALUE
-math_log(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = log(RFLOAT(x)->value);
- domain_check(d, "log");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.log10(numeric) => float
- *
- * Returns the base 10 logarithm of <i>numeric</i>.
- */
-
-static VALUE
-math_log10(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = log10(RFLOAT(x)->value);
- domain_check(d, "log10");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.sqrt(numeric) => float
- *
- * Returns the non-negative square root of <i>numeric</i>.
- */
-
-static VALUE
-math_sqrt(obj, x)
- VALUE obj, x;
-{
- double d;
-
- Need_Float(x);
- errno = 0;
- d = sqrt(RFLOAT(x)->value);
- domain_check(d, "sqrt");
- return rb_float_new(d);
-}
-
-/*
- * call-seq:
- * Math.frexp(numeric) => [ fraction, exponent ]
- *
- * Returns a two-element array containing the normalized fraction (a
- * <code>Float</code>) and exponent (a <code>Fixnum</code>) of
- * <i>numeric</i>.
- *
- * fraction, exponent = Math.frexp(1234) #=> [0.6025390625, 11]
- * fraction * 2**exponent #=> 1234.0
- */
-
-static VALUE
-math_frexp(obj, x)
- VALUE obj, x;
-{
- double d;
- int exp;
-
- Need_Float(x);
-
- d = frexp(RFLOAT(x)->value, &exp);
- return rb_assoc_new(rb_float_new(d), INT2NUM(exp));
-}
-
-/*
- * call-seq:
- * Math.ldexp(flt, int) -> float
- *
- * Returns the value of <i>flt</i>*(2**<i>int</i>).
- *
- * fraction, exponent = Math.frexp(1234)
- * Math.ldexp(fraction, exponent) #=> 1234.0
- */
-
-static VALUE
-math_ldexp(obj, x, n)
- VALUE obj, x, n;
-{
- Need_Float(x);
- return rb_float_new(ldexp(RFLOAT(x)->value, NUM2INT(n)));
-}
-
-/*
- * call-seq:
- * Math.hypot(x, y) => float
- *
- * Returns sqrt(x**2 + y**2), the hypotenuse of a right-angled triangle
- * with sides <i>x</i> and <i>y</i>.
- *
- * Math.hypot(3, 4) #=> 5.0
- */
-
-static VALUE
-math_hypot(obj, x, y)
- VALUE obj, x, y;
-{
- Need_Float2(x, y);
- return rb_float_new(hypot(RFLOAT(x)->value, RFLOAT(y)->value));
-}
-
-/*
- * call-seq:
- * Math.erf(x) => float
- *
- * Calculates the error function of x.
- */
-
-static VALUE
-math_erf(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(erf(RFLOAT(x)->value));
-}
-
-/*
- * call-seq:
- * Math.erfc(x) => float
- *
- * Calculates the complementary error function of x.
- */
-
-static VALUE
-math_erfc(obj, x)
- VALUE obj, x;
-{
- Need_Float(x);
- return rb_float_new(erfc(RFLOAT(x)->value));
-}
-
-/*
- * The <code>Math</code> module contains module functions for basic
- * trigonometric and transcendental functions. See class
- * <code>Float</code> for a list of constants that
- * define Ruby's floating point accuracy.
- */
-
-
-void
-Init_Math()
-{
- rb_mMath = rb_define_module("Math");
-
-#ifdef M_PI
- rb_define_const(rb_mMath, "PI", rb_float_new(M_PI));
-#else
- rb_define_const(rb_mMath, "PI", rb_float_new(atan(1.0)*4.0));
-#endif
-
-#ifdef M_E
- rb_define_const(rb_mMath, "E", rb_float_new(M_E));
-#else
- rb_define_const(rb_mMath, "E", rb_float_new(exp(1.0)));
-#endif
-
- rb_define_module_function(rb_mMath, "atan2", math_atan2, 2);
- rb_define_module_function(rb_mMath, "cos", math_cos, 1);
- rb_define_module_function(rb_mMath, "sin", math_sin, 1);
- rb_define_module_function(rb_mMath, "tan", math_tan, 1);
-
- rb_define_module_function(rb_mMath, "acos", math_acos, 1);
- rb_define_module_function(rb_mMath, "asin", math_asin, 1);
- rb_define_module_function(rb_mMath, "atan", math_atan, 1);
-
- rb_define_module_function(rb_mMath, "cosh", math_cosh, 1);
- rb_define_module_function(rb_mMath, "sinh", math_sinh, 1);
- rb_define_module_function(rb_mMath, "tanh", math_tanh, 1);
-
- rb_define_module_function(rb_mMath, "acosh", math_acosh, 1);
- rb_define_module_function(rb_mMath, "asinh", math_asinh, 1);
- rb_define_module_function(rb_mMath, "atanh", math_atanh, 1);
-
- rb_define_module_function(rb_mMath, "exp", math_exp, 1);
- rb_define_module_function(rb_mMath, "log", math_log, 1);
- rb_define_module_function(rb_mMath, "log10", math_log10, 1);
- rb_define_module_function(rb_mMath, "sqrt", math_sqrt, 1);
-
- rb_define_module_function(rb_mMath, "frexp", math_frexp, 1);
- rb_define_module_function(rb_mMath, "ldexp", math_ldexp, 2);
-
- rb_define_module_function(rb_mMath, "hypot", math_hypot, 2);
-
- rb_define_module_function(rb_mMath, "erf", math_erf, 1);
- rb_define_module_function(rb_mMath, "erfc", math_erfc, 1);
-}
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