}/* memory_word */ /* * memory_close * * End of output redirection. * */ internal static void memory_close() { if (depth >= 0) { if (redirect[depth].xsize != 0xffff) { memory_new_line(); } if (main.h_version == ZMachine.V6) { main.h_line_width = (redirect[depth].xsize != 0xffff) ? redirect[depth].total : redirect[depth].width; FastMem.SET_WORD(ZMachine.H_LINE_WIDTH, main.h_line_width); } if (depth == 0) { main.ostream_memory = false; } depth--; } }/* memory_close */
}/* script_open */ /* * script_close * * Stop transscription. * */ internal static void script_close() { main.h_flags &= (ushort)~ZMachine.SCRIPTING_FLAG; FastMem.SET_WORD(ZMachine.H_FLAGS, main.h_flags); sfp.Close(); main.ostream_script = false; }/* script_close */
}/* z_insert_obj */ /* * z_put_prop, set the value of an object property. * * Process.zargs[0] = object * Process.zargs[1] = number of property to set * Process.zargs[2] = value to set property to * */ internal static void z_put_prop() { zword prop_addr; zbyte value; zbyte mask; if (Process.zargs[0] == 0) { Err.runtime_error(ErrorCodes.ERR_PUT_PROP_0); return; } /* Property id is in bottom five or six bits */ mask = (zbyte)((main.h_version <= ZMachine.V3) ? 0x1f : 0x3f); /* Load address of first property */ prop_addr = first_property(Process.zargs[0]); /* Scan down the property list */ for (; ;) { FastMem.LOW_BYTE(prop_addr, out value); if ((value & mask) <= Process.zargs[1]) { break; } prop_addr = next_property(prop_addr); } /* Exit if the property does not exist */ if ((value & mask) != Process.zargs[1]) { Err.runtime_error(ErrorCodes.ERR_NO_PROP); } /* Store the new property value (byte or word sized) */ prop_addr++; if ((main.h_version <= ZMachine.V3 && !((value & 0xe0) > 0)) || (main.h_version >= ZMachine.V4 && !((value & 0xc0) > 0))) { zbyte v = (zbyte)Process.zargs[2]; FastMem.SET_BYTE(prop_addr, v); } else { zword v = Process.zargs[2]; FastMem.SET_WORD(prop_addr, v); } }/* z_put_prop */
}/* z_pop_stack */ /* * z_pull, pop a value off... * * a) ...the game or a user stack and store it (V6) * * zargs[0] = address of user stack (optional) * * b) ...the game stack and write it to a variable (other than V6) * * zargs[0] = variable to write value to * */ internal static void z_pull() { zword value; if (main.h_version != ZMachine.V6) /* not a V6 game, pop stack and write */ { value = main.stack[main.sp++]; if (Process.zargs[0] == 0) { main.stack[main.sp] = value; } else if (Process.zargs[0] < 16) { // *(fp - Process.zargs[0]) = value; main.stack[main.fp - Process.zargs[0]] = value; } else { zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16)); FastMem.SET_WORD(addr, value); } } else /* it's V6, but is there a user stack? */ { if (Process.zargc == 1) /* it's a user stack */ { zword size; zword addr = Process.zargs[0]; FastMem.LOW_WORD(addr, out size); size++; FastMem.storew(addr, size); addr += (zword)(2 * size); FastMem.LOW_WORD(addr, out value); } else { value = main.stack[main.sp++]; // value = *sp++; /* it's the game stack */ } Process.store(value); } }/* z_pull */
}/* z_push_stack */ /* * z_store, write a value to a variable. * * zargs[0] = variable to be written to * zargs[1] = value to write * */ internal static void z_store() { zword value = Process.zargs[1]; if (Process.zargs[0] == 0) { main.stack[main.sp] = value; } else if (Process.zargs[0] < 16) { main.stack[main.fp - Process.zargs[0]] = value; } else { zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16)); FastMem.SET_WORD(addr, value); } }/* z_store */
}/* z_dec_chk */ /* * z_inc, increment a variable. * * zargs[0] = variable to increment * */ internal static void z_inc() { zword value; if (Process.zargs[0] == 0) { main.stack[main.sp]++; // (*sp)++; } else if (Process.zargs[0] < 16) { (main.stack[main.fp - Process.zargs[0]])++; } else { zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16)); FastMem.LOW_WORD(addr, out value); value++; FastMem.SET_WORD(addr, value); } }/* z_inc */
}/* z_dec */ /* * z_dec_chk, decrement a variable and branch if now less than value. * * zargs[0] = variable to decrement * zargs[1] = value to check variable against * */ internal static void z_dec_chk() { zword value; if (Process.zargs[0] == 0) { value = --(main.stack[main.sp]); } else if (Process.zargs[0] < 16) { value = --(main.stack[main.fp - Process.zargs[0]]); } else { zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16)); FastMem.LOW_WORD(addr, out value); value--; FastMem.SET_WORD(addr, value); } Process.branch((short)value < (short)Process.zargs[1]); }/* z_dec_chk */
}/* branch */ /* * store * * Store an operand, either as a variable or pushed on the stack. * */ internal static void store(zword value) { zbyte variable; FastMem.CODE_BYTE(out variable); if (variable == 0) { main.stack[--main.sp] = value; // *--sp = value; DebugState.Output(" Storing {0} on stack at {1}", value, main.sp); } else if (variable < 16) { main.stack[main.fp - variable] = value; // *(fp - variable) = value; DebugState.Output(" Storing {0} on stack as Variable {1} at {2}", value, variable, main.sp); } else { zword addr = (zword)(main.h_globals + 2 * (variable - 16)); FastMem.SET_WORD(addr, value); DebugState.Output(" Storing {0} at {1}", value, addr); } }/* store */
internal static void script_open() { string new_name = null; main.h_flags &= (zword) ~ZMachine.SCRIPTING_FLAG; if (main.h_version >= ZMachine.V5 || !script_valid) { if (os_.read_file_name(out new_name, General.DEFAULT_SCRIPT_NAME, FileTypes.FILE_SCRIPT) != true) { goto done; } script_name = new_name; } if ((sfp = new System.IO.StreamWriter(script_name, true)) != null) { main.h_flags |= ZMachine.SCRIPTING_FLAG; script_valid = true; main.ostream_script = true; script_width = 0; sfp.AutoFlush = true; } else { Text.print_string("Cannot open file\n"); } done: FastMem.SET_WORD(ZMachine.H_FLAGS, main.h_flags); }/* script_open */
}/* z_get_sibling */ /* * z_insert_obj, make an object the first child of another object. * * Process.zargs[0] = object to be moved * Process.zargs[1] = destination object * */ internal static void z_insert_obj() { zword obj1 = Process.zargs[0]; zword obj2 = Process.zargs[1]; zword obj1_addr; zword obj2_addr; /* If we are monitoring object movements display a short note */ if (main.option_object_movement == true) { Stream.stream_mssg_on(); Text.print_string("@move_obj "); Text.print_object(obj1); Text.print_string(" "); Text.print_object(obj2); Stream.stream_mssg_off(); } if (obj1 == 0) { Err.runtime_error(ErrorCodes.ERR_MOVE_OBJECT_0); return; } if (obj2 == 0) { Err.runtime_error(ErrorCodes.ERR_MOVE_OBJECT_TO_0); return; } /* Get addresses of both objects */ obj1_addr = object_address(obj1); obj2_addr = object_address(obj2); /* Remove object 1 from current parent */ unlink_object(obj1); /* Make object 1 first child of object 2 */ if (main.h_version <= ZMachine.V3) { zbyte child; obj1_addr += O1_PARENT; FastMem.SET_BYTE(obj1_addr, (zbyte)obj2); obj2_addr += O1_CHILD; FastMem.LOW_BYTE(obj2_addr, out child); FastMem.SET_BYTE(obj2_addr, (zbyte)obj1); obj1_addr += (zword)(O1_SIBLING - O1_PARENT); FastMem.SET_BYTE(obj1_addr, child); } else { zword child; obj1_addr += O4_PARENT; FastMem.SET_WORD(obj1_addr, obj2); obj2_addr += O4_CHILD; FastMem.LOW_WORD(obj2_addr, out child); FastMem.SET_WORD(obj2_addr, obj1); obj1_addr += (zword)(O4_SIBLING - O4_PARENT); FastMem.SET_WORD(obj1_addr, child); } }/* z_insert_obj */
}/* next_property */ /* * unlink_object * * Unlink an object from its parent and siblings. * */ static void unlink_object(zword object_var) { zword obj_addr; zword parent_addr; zword sibling_addr; if (object_var == 0) { Err.runtime_error(ErrorCodes.ERR_REMOVE_OBJECT_0); return; } obj_addr = object_address(object_var); if (main.h_version <= ZMachine.V3) { zbyte parent; zbyte younger_sibling; zbyte older_sibling; zbyte zero = 0; /* Get parent of object, and return if no parent */ obj_addr += O1_PARENT; FastMem.LOW_BYTE(obj_addr, out parent); if (parent == 0) { return; } /* Get (older) sibling of object and set both parent and sibling * pointers to 0 */ FastMem.SET_BYTE(obj_addr, zero); obj_addr += (zword)(O1_SIBLING - O1_PARENT); FastMem.LOW_BYTE(obj_addr, out older_sibling); FastMem.SET_BYTE(obj_addr, zero); /* Get first child of parent (the youngest sibling of the object) */ parent_addr = (zword)(object_address(parent) + O1_CHILD); FastMem.LOW_BYTE(parent_addr, out younger_sibling); /* Remove object from the list of siblings */ if (younger_sibling == object_var) { FastMem.SET_BYTE(parent_addr, older_sibling); } else { do { sibling_addr = (zword)(object_address(younger_sibling) + O1_SIBLING); FastMem.LOW_BYTE(sibling_addr, out younger_sibling); } while (younger_sibling != object_var); FastMem.SET_BYTE(sibling_addr, older_sibling); } } else { zword parent; zword younger_sibling; zword older_sibling; zword zero = 0; /* Get parent of object, and return if no parent */ obj_addr += O4_PARENT; FastMem.LOW_WORD(obj_addr, out parent); if (parent == 0) { return; } /* Get (older) sibling of object and set both parent and sibling * pointers to 0 */ FastMem.SET_WORD(obj_addr, zero); obj_addr += (zword)(O4_SIBLING - O4_PARENT); FastMem.LOW_WORD(obj_addr, out older_sibling); FastMem.SET_WORD(obj_addr, zero); /* Get first child of parent (the youngest sibling of the object) */ parent_addr = (zword)(object_address(parent) + O4_CHILD); FastMem.LOW_WORD(parent_addr, out younger_sibling); /* Remove object from the list of siblings */ if (younger_sibling == object_var) { FastMem.SET_WORD(parent_addr, older_sibling); } else { do { sibling_addr = (zword)(object_address(younger_sibling) + O4_SIBLING); FastMem.LOW_WORD(sibling_addr, out younger_sibling); } while (younger_sibling != object_var); FastMem.SET_WORD(sibling_addr, older_sibling); } } }/* unlink_object */