Memory control system responsive to determination, allocating adjacent test space for editing space, relocating adjacent text and editing selected text

A information storage apparatus comprising:

• memory means having a plurality of storage positions for storing a plurality of character trains, the storage positions being assigned associated sequential addresses;
• a directory section for storing for each character train stored in said memory means, headline information, storage position information indicating the location of the character train in said memory means, and character number information indicating the number of characters in the character train;
• determining means for determining, when a desired one of the character trains in said memory means is to be updated, the location of an unused storage area with respect to the position of the desired character train on the basis of the storage position information and the character number information;
• and
• control means for controlling an unused storage area to be set subsequently to the position of the desired character train by moving in sequence some character trains adjacent to the desired character train to an unused storage area or by moving the desired character train, in response to a determination by said determination means, the storage position information, and the character number information.

A memory control unit comprising:

• memory means for storing a plurality of character trains, said memory means having a plurality of storage areas, wherein a prescribed sequence of addresses are assigned to respective storage areas;
• directory means, for storing an index for each character train stored in said memory means and for storing, for each index, area information indicating in which one of the storage areas its associated character train is stored and character number information indicating the number of characters included int he associated character train;
• determining means for determining, when a desired one of the plurality of character trains stored in said memory means is to be updated, the position of an unused storage area in said memory means with respect to an area in which the desired character train is stored, in response to the area information and the character number information stored in said directory means;
• and
• control means for controlling said unit such that the current storage area for the desired character train and its subsequent storage area are assigned as a new storage area for the desired character train by sequentially moving some character trains subsequent to the desired character train in said memory means to the unused storage area in response to the determination by said determining means and the area information and the character number information.

A memory of enlarging an editing and storing area of a desired character train in an information processing system having memory means, for storing a plurality of character trains, having a plurality of storage areas to which a prescribed sequence of addresses are respectively assigned, and directory means for storing an index for each character train stored in the memory means and for storing, for each index, area information indicating in which one of the storage areas its associated character train is stored and character number information indicating the number of characters included in the associated character train, said method comprising the steps of:

• determining, when a desired one of the plurality of character trains stored in the memory means is to be updated, the position of an unused storage area in the memory means with respect to an area in which the desired character train is stored, in response to the area information and the character number information stored in the directory means;
• and
• assigning the current storage area of the desired character train and its subsequent storage area as a new storage area for the desired character train by sequentially moving some character trains subsequent to the desired character train in the memory means to the unused storage area in response to the determining in the determining step and the area information and the character number information.