trim_preserve_decimal_digits()

static double trim_preserve_decimal_digits ( double  d, int32_t  decimal_digits  )

static

Definition at line 2548 of file lwgeom.c.

{
        if (d == 0)
                return 0;
 
        int digits_left_of_decimal = (int) (1 + log10(fabs(d)));
        uint8_t bits_needed = bits_for_precision(decimal_digits + digits_left_of_decimal);
        uint64_t mask = 0xffffffffffffffffULL << (52 - bits_needed);
        uint64_t dint = 0;
        size_t dsz = sizeof(d) < sizeof(dint) ? sizeof(d) : sizeof(dint);
 
        memcpy(&dint, &d, dsz);
        dint &= mask;
        memcpy(&d, &dint, dsz);
        return d;
}

References bits_for_precision().

Referenced by lwgeom_trim_bits_in_place().

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