Function ParseMoney

src/util/moneystr.cpp:41–88

std::optional<CAmount> ParseMoney(const std::string& money_string)
{
    if (!ValidAsCString(money_string)) {
        return std::nullopt;
    }
    const std::string str = TrimString(money_string);
    if (str.empty()) {
        return std::nullopt;
    }

    std::string strWhole;
    int64_t nUnits = 0;
    const char* p = str.c_str();
    for (; *p; p++)
    {
        if (*p == '.')
        {
            p++;
            int64_t nMult = COIN / 10;
            while (IsDigit(*p) && (nMult > 0))
            {
                nUnits += nMult * (*p++ - '0');
                nMult /= 10;
            }
            break;
        }
        if (IsSpace(*p))
            return std::nullopt;
        if (!IsDigit(*p))
            return std::nullopt;
        strWhole.insert(strWhole.end(), *p);
    }
    if (*p) {
        return std::nullopt;
    }
    if (strWhole.size() > 10) // guard against 63 bit overflow
        return std::nullopt;
    if (nUnits < 0 || nUnits > COIN)
        return std::nullopt;
    int64_t nWhole = LocaleIndependentAtoi<int64_t>(strWhole);
    CAmount value = nWhole * COIN + nUnits;

    if (!MoneyRange(value)) {
        return std::nullopt;
    }

    return value;
}