Function PatchFormatStringFloatToInt

imgui/imgui_widgets.cpp:1740–1759

FIXME-LEGACY: Prior to 1.61 our DragInt() function internally used floats and because of this the compile-time default value for format was "%.0f". Even though we changed the compile-time default, we expect users to have carried %f around, which would break the display of DragInt() calls. To honor backward compatibility we are rewriting the format string, unless IMGUI_DISABLE_OBSOLETE_FUNCTIONS is

// Even though we changed the compile-time default, we expect users to have carried %f around, which would break the display of DragInt() calls.
// To honor backward compatibility we are rewriting the format string, unless IMGUI_DISABLE_OBSOLETE_FUNCTIONS is enabled. What could possibly go wrong?!
static const char* PatchFormatStringFloatToInt(const char* fmt)
{
    if (fmt[0] == '%' && fmt[1] == '.' && fmt[2] == '0' && fmt[3] == 'f' && fmt[4] == 0) // Fast legacy path for "%.0f" which is expected to be the most common case.
        return "%d";
    const char* fmt_start = ImParseFormatFindStart(fmt);    // Find % (if any, and ignore %%)
    const char* fmt_end = ImParseFormatFindEnd(fmt_start);  // Find end of format specifier, which itself is an exercise of confidence/recklessness (because snprintf is dependent on libc or user).
    if (fmt_end > fmt_start && fmt_end[-1] == 'f')
    {
#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
        if (fmt_start == fmt && fmt_end[0] == 0)
            return "%d";
        ImGuiContext& g = *GImGui;
        ImFormatString(g.TempBuffer, IM_ARRAYSIZE(g.TempBuffer), "%.*s%%d%s", (int)(fmt_start - fmt), fmt, fmt_end); // Honor leading and trailing decorations, but lose alignment/precision.
        return g.TempBuffer;
#else
        IM_ASSERT(0 && "DragInt(): Invalid format string!"); // Old versions used a default parameter of "%.0f", please replace with e.g. "%d"
#endif
    }
    return fmt;
}

const ImGuiDataTypeInfo* ImGui::DataTypeGetInfo(ImGuiDataType data_type)
{