Function readIntText

base/base/JSON.cpp:57–96

Read signed integer in a simple form from a non-0-terminated string.

/// Read signed integer in a simple form from a non-0-terminated string.
static Int64 readIntText(const char * buf, const char * end)
{
    bool negative = false;
    UInt64 x = 0;

    if (buf == end)
        throw JSONException("JSON: cannot parse signed integer: unexpected end of data.");

    bool run = true;
    while (buf != end && run)
    {
        switch (*buf)
        {
            case '+':
                break;
            case '-':
                negative = true;
                break;
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
                x *= 10;
                x += *buf - '0';
                break;
            default:
                run = false;
                break;
        }
        ++buf;
    }

    return negative ? -x : x;
}


/// Read floating point number in simple format, imprecisely, from a non-0-terminated string.