Function StrtodFullPrecision

rapidjson/internal/strtod.h:224–264

}

inline double StrtodFullPrecision(double d, int p, const char* decimals, size_t length, size_t decimalPosition, int exp) {
    RAPIDJSON_ASSERT(d >= 0.0);
    RAPIDJSON_ASSERT(length >= 1);

    double result;
    if (StrtodFast(d, p, &result))
        return result;

    // Trim leading zeros
    while (*decimals == '0' && length > 1) {
        length--;
        decimals++;
        decimalPosition--;
    }

    // Trim trailing zeros
    while (decimals[length - 1] == '0' && length > 1) {
        length--;
        decimalPosition--;
        exp++;
    }

    // Trim right-most digits
    const int kMaxDecimalDigit = 780;
    if (static_cast<int>(length) > kMaxDecimalDigit) {
        int delta = (static_cast<int>(length) - kMaxDecimalDigit);
        exp += delta;
        decimalPosition -= static_cast<unsigned>(delta);
        length = kMaxDecimalDigit;
    }

    // If too small, underflow to zero
    if (int(length) + exp < -324)
        return 0.0;

    if (StrtodDiyFp(decimals, length, decimalPosition, exp, &result))
        return result;

    // Use approximation from StrtodDiyFp and make adjustment with BigInteger comparison
    return StrtodBigInteger(result, decimals, length, decimalPosition, exp);
}

} // namespace internal
RAPIDJSON_NAMESPACE_END