Function SanitizeFormatString

src/third-party/imgui/imgui_widgets.cpp:2123–2135

Sanitize format - Zero terminate so extra characters after format (e.g. "%f123") don't confuse atof/atoi - stb_sprintf.h supports several new modifiers which format numbers in a way that also makes them incompatible atof/atoi.

// - Zero terminate so extra characters after format (e.g. "%f123") don't confuse atof/atoi
// - stb_sprintf.h supports several new modifiers which format numbers in a way that also makes them incompatible atof/atoi.
static void SanitizeFormatString(const char* fmt, char* fmt_out, size_t fmt_out_size)
{
    IM_UNUSED(fmt_out_size);
    const char* fmt_end = ImParseFormatFindEnd(fmt);
    IM_ASSERT((size_t)(fmt_end - fmt + 1) < fmt_out_size); // Format is too long, let us know if this happens to you!
    while (fmt < fmt_end)
    {
        char c = *(fmt++);
        if (c != '\'' && c != '$' && c != '_') // Custom flags provided by stb_sprintf.h. POSIX 2008 also supports '.
            *(fmt_out++) = c;
    }
    *fmt_out = 0; // Zero-terminate
}

template<typename TYPE, typename SIGNEDTYPE>
TYPE ImGui::RoundScalarWithFormatT(const char* format, ImGuiDataType data_type, TYPE v)