/**********************************************************************

  math.c -

  $Author: eban $
  $Date: 2001/03/09 17:49:31 $
  created at: Tue Jan 25 14:12:56 JST 1994

  Copyright (C) 1993-2000 Yukihiro Matsumoto

**********************************************************************/

#include "ruby.h"
#include <math.h>

VALUE rb_mMath;

#define Need_Float(x) (x) = rb_Float(x)
#define Need_Float2(x,y) {\
    Need_Float(x);\
    Need_Float(y);\
}

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));
}

static VALUE
math_cos(obj, x)
    VALUE obj, x;
{
    Need_Float(x);

    return rb_float_new(cos(RFLOAT(x)->value));
}

static VALUE
math_sin(obj, x)
    VALUE obj, x;
{
    Need_Float(x);

    return rb_float_new(sin(RFLOAT(x)->value));
}

static VALUE
math_tan(obj, x)
    VALUE obj, x;
{
    Need_Float(x);

    return rb_float_new(tan(RFLOAT(x)->value));
}

static VALUE
math_exp(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(exp(RFLOAT(x)->value));
}

#if defined __CYGWIN__
#define log(x) ((x) < 0.0 ? nan() : log(x))
#define log10(x) ((x) < 0.0 ? nan() : log10(x))
#endif

static VALUE
math_log(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(log(RFLOAT(x)->value));
}

static VALUE
math_log10(obj, x)
    VALUE obj, x;
{
    Need_Float(x);
    return rb_float_new(log10(RFLOAT(x)->value));
}

static VALUE
math_sqrt(obj, x)
    VALUE obj, x;
{
    Need_Float(x);

    if (RFLOAT(x)->value < 0.0) rb_raise(rb_eArgError, "square root for negative number");
    return rb_float_new(sqrt(RFLOAT(x)->value));
}

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));
}

static VALUE
math_ldexp(obj, x, n)
    VALUE obj, x, n;
{
    double d;

    Need_Float(x);
    return rb_float_new(d = ldexp(RFLOAT(x)->value, NUM2INT(n)));
}

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, "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);
}
