floor.c

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#include <math.h>
#include <stdint.h>
 
double floor(double x)
{
    if (isinf(x) || x == 0.0 || x == -0.0)
    {
        return x;
    }
 
    if (isnan(x))
    {
        return NAN;
    }
 
    if (fabs(x) >= INT64_MAX)
    {
        return x;
    }
 
    int64_t intPart = (int64_t)x;
    if (x < 0.0 && x != (double)intPart)
    {
        intPart--;
    }
 
    return (double)intPart;
}