Function ImFormatString

imgui_tiny_app/imgui/imgui.cpp:2350–2366

#endif

int ImFormatString(char* buf, size_t buf_size, const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);
#ifdef IMGUI_USE_STB_SPRINTF
    int w = stbsp_vsnprintf(buf, (int)buf_size, fmt, args);
#else
    int w = vsnprintf(buf, buf_size, fmt, args);
#endif
    va_end(args);
    if (buf == NULL)
        return w;
    if (w == -1 || w >= (int)buf_size)
        w = (int)buf_size - 1;
    buf[w] = 0;
    return w;
}

int ImFormatStringV(char* buf, size_t buf_size, const char* fmt, va_list args)
{