};
            
            struct Finder {
                struct Slice text;
                struct Slice desired;
                size_t pos;
            };

    // Os
        // system specifics 
            #if __target_os__ == __TargetOs_windows__
            #elif __target_os__ == __TargetOs_linux__
                struct __OsLinux_timespec__ {
                    time_t tv_sec;  /* seconds */
                    long   tv_nsec; /* nanoseconds */

                FILE* console_input_handle;
                __OsConsoleOutputHandle__ console_output_handle;
            #else
                #error "not implemented current __target_os__ or not defined. (expected __TargetOs_ value)"
            
            #endif
        };

    // Scalpi
        // math
            struct __Scalpi_math_d2_U_Pos__ {
                size_t x;
                size_t y;
            };
        

            
            struct __ScalpiTerminal__ {
                struct __ScalpiConsole__           *console;
                struct __OsConsoleFlags__          system_flags;
                struct __ScalpiTerminalInput__     input;
                struct __ScalpiTerminalOutput__    output;
            };

    // crypto
        // Sha1_Streaming
            struct Sha1_Streaming {
                uint32_t state[5];
                char block [Sha1_block_size];
                size_t buf_len; // current?filling level of block
                uint64_t total_len;
            };
            
            struct RoundParam {uint32_t a; uint32_t b; uint32_t c; uint32_t d; uint32_t e; uint32_t i;};

    // network
        // Scalpi_network_tcp_Ip
            // ip
                struct Scalpi_network_tcp_Ip {
                    uint8_t address[4];
                    uint16_t port;
                };

                struct Scalpi_network_tcp_http_WebSocket_Parser {
                    size_t frame_len;
                    size_t header_len;
                    char* message; // no null
                    size_t message_len;
                };    
    // App
        struct __AppEditorHistoryNote__ {
            __ScalpiConsoleAnsiInputKey__  key;
            struct __ScalpiMemListLink__   link;
        };
        
        struct App {
            struct __OsHelper__   __App_osHelper__;
            struct Scalpi_Logger  logger;
            uint64_t              tick;
        };

// function prototypes