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LNATION / smallnum-XS-0.02 / lib / smallnum / XS.xs 

            

              
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#define PERL_NO_GET_CONTEXT // we'll define thread context if necessary (faster)
#include "EXTERN.h"         // globals/constant import locations
#include "perl.h"           // Perl symbols, structures and constants definition
#include "XSUB.h"           // xsubpp functions and macros
#include <stdlib.h>         // rand()
#include <string.h>
double PRECISION = 0.01;
double OFFSET = 0.5555555;
static SV * new (double num) {
        dTHX;
        return sv_bless(newRV_noinc(newSVnv(num)), gv_stashsv(newSVpv("smallnum::XS", 12), 0));
}
static double _sref (SV * n) {
        dTHX;
        double num;
        if ( SvROK(n) ) {
                num = SvNV(SvRV(n));
        } else {
                num = SvNV(n);
        }
        return num;
}
MODULE = smallnum::XS  PACKAGE = smallnum::XS
PROTOTYPES: ENABLE
FALLBACK: TRUE
SV * _smallnum (...)
        CODE:
                double num = SvNV(ST(0));
                RETVAL = new(num);
        OUTPUT:
                RETVAL
SV * _set_precision (num)
        SV * num
        CODE:
                PRECISION = SvNV(num);
                RETVAL = newSVsv(num);
        OUTPUT:
                RETVAL
SV * _set_offset (num)
        SV * num
        CODE:
                OFFSET = SvNV(num);
                RETVAL = newSVsv(num);
        OUTPUT:
                RETVAL
SV * _num (...)
        OVERLOAD: \"\"
        CODE:
                double num = _sref(ST(0));
                double out = num >= 0 
                        ? PRECISION * floor(( num + ( OFFSET * PRECISION )) / PRECISION)
                        : PRECISION * ceil(( num - OFFSET * PRECISION) / PRECISION);
                RETVAL = newSVnv(out);
        OUTPUT:
                RETVAL
SV * _divide (...)
        OVERLOAD: /
        CODE:
                double num1 = _sref(ST(0));
                double num2 = _sref(ST(1));
                double out = num1 && num2 
                        ? SvOK(ST(2)) && SvIV(ST(2)) > 0
                                ? num2 / num1
                                : num1 / num2
                        : 0;
                RETVAL = new(out);
        OUTPUT:
                RETVAL
SV * _multiply (...)
        OVERLOAD: *
        CODE:
                double num1 = _sref(ST(0));
                double num2 = _sref(ST(1));
                double out = num2 * num1;
                RETVAL = new(out);
        OUTPUT:
                RETVAL