Function getMinFormatStringOutputLength

lib/checkbufferoverrun.cpp:80–189

}

static int getMinFormatStringOutputLength(const std::vector<const Token*> &parameters, nonneg int formatStringArgNr, const Settings& settings)
{
    if (formatStringArgNr <= 0 || formatStringArgNr > parameters.size())
        return 0;
    if (parameters[formatStringArgNr - 1]->tokType() != Token::eString)
        return 0;
    const std::string &formatString = parameters[formatStringArgNr - 1]->str();
    bool percentCharFound = false;
    int outputStringSize = 0;
    bool handleNextParameter = false;
    std::string digits_string;
    bool i_d_x_f_found = false;
    int parameterLength = 0;
    nonneg int inputArgNr = formatStringArgNr;
    for (std::size_t i = 1; i + 1 < formatString.length(); ++i) {
        if (formatString[i] == '\\') {
            if (i < formatString.length() - 1 && formatString[i + 1] == '0')
                break;

            ++outputStringSize;
            ++i;
            continue;
        }

        if (percentCharFound) {
            switch (formatString[i]) {
            case 'f':
            case 'x':
            case 'X':
            case 'i':
                i_d_x_f_found = true;
                handleNextParameter = true;
                parameterLength = 1; // TODO
                break;
            case 'c':
            case 'e':
            case 'E':
            case 'g':
            case 'o':
            case 'u':
            case 'p':
            case 'n':
                handleNextParameter = true;
                parameterLength = 1; // TODO
                break;
            case 'd':
                i_d_x_f_found = true;
                parameterLength = 1;
                if (inputArgNr < parameters.size() && parameters[inputArgNr]->hasKnownIntValue())
                    parameterLength = MathLib::toString(parameters[inputArgNr]->getKnownIntValue()).length();

                handleNextParameter = true;
                break;
            case 's':
                parameterLength = 0;
                if (inputArgNr < parameters.size())
                    parameterLength = ValueFlow::valueFlowGetStrLength(parameters[inputArgNr], settings);