MODULE Fetcher;
    IMPORT OS, Browser, BrowserOpen, Desktop;

    EXTERN terminalStreamPtr: POINTER TO CHAR;
    EXTERN arg0Ptr: POINTER TO CHAR;
    EXTERN arg1Ptr: POINTER TO CHAR;
    EXTERN arg2Ptr: POINTER TO CHAR;
    EXTERN arg3Ptr: POINTER TO CHAR;

    VAR iconsResFile: ARRAY FILE_STRUCT_SIZE OF CHAR;
        iconsRes: POINTER TO CHAR;
        iconsResSize: INT;
        hasIcons: CHAR;

    PROCEDURE Main();
    BEGIN
        (* open icons.res from the boot disk and read its contents into `iconsRes` *)
        hasIcons := 0;
        IF open("icons.res", get_boot_disk_id(), PTROF(iconsResFile)) THEN
            iconsResSize := get_size(PTROF(iconsResFile));
            iconsRes := allocate_memory(iconsResSize);
            read(iconsResSize, PTROF(iconsResFile), iconsRes);
            hasIcons := 1;
        END;

        IF (CompareString("boot", arg0Ptr)) THEN
            (* launched from startup.bat *)
            DesktopMain(hasIcons, iconsRes);
        ELSIF (CompareString("open", arg0Ptr)) & (arg1Ptr # 0) & (arg2Ptr # 0) THEN
            (* launched from an application wanting to open a file *)
            BrowserOpenMain(arg1Ptr, arg2Ptr, hasIcons, iconsRes);
        ELSIF arg0Ptr <|= 5 THEN
            (* launched from an existing instance of fetcher *)
            BrowserMain(arg0Ptr, arg1Ptr, arg2Ptr, arg3Ptr, hasIcons, iconsRes);
        ELSE
            (* probably launched from the terminal *)
            BrowserMain(string_to_int(arg0Ptr, 10), 0, 0, 0, hasIcons, iconsRes);
        END;

        IF hasIcons THEN
            free_memory(iconsRes);
        END;
    END;
END.