Function WriteFloatToBuffer

base/string/number.cpp:332–354

------------------------------------------------------------- Float to string or buffer. Makesure buffer size >= kMaxFloatStringSize -------------------------------------------------------------

// Makesure buffer size >= kMaxFloatStringSize
// -------------------------------------------------------------
char* WriteFloatToBuffer(float value, char* buffer)
{
    // FLT_DIG is 6 on almost all platforms.
    // If it's too big, the buffer will overflow
    TOFT_STATIC_ASSERT(FLT_DIG < 10, "FLT_DIG is too big");
    if (value >= std::numeric_limits<double>::infinity())
    {
        strcpy(buffer, "inf"); // NOLINT
        return buffer + 3;
    }
    else if (value <= -std::numeric_limits<double>::infinity())
    {
        strcpy(buffer, "-inf"); // NOLINT
        return buffer + 4;
    }
    else if (isnan(value))
    {
        strcpy(buffer, "nan"); // NOLINT
        return buffer + 3;
    }

    return buffer + snprintf(buffer, kMaxFloatStringSize, "%.*g", FLT_DIG, value);
}

char* DoubleToString(double n, char* buffer)
{