JPH0797371B2 - Character data storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to detecting a code of character data corresponding to a display character on a screen in a display device for storing a code of character data and displaying the screen. In order to reduce complicated processing, the character display position on the display screen and the code on the code storage area are provided by providing a plurality of code storage areas having a storage unit corresponding to the display screen and storing the character code. Corresponding to the memory location of.

[Industrial application field]

In recent years, processing to handle character data on the display screen has been performed,
In particular, an editor or the like performs software processing for editing a character string on the screen.

This is for displaying and editing a character having a different display size such as a double-byte kanji character or a single-byte alphanumeric character and kana based on character data composed of a character code and a control code.

In this case, since the size of the displayed character and the length of the character code differ depending on the displayed character, there are cases where the character display position on the screen and the code storage position on the storage means do not correspond uniquely. Therefore, there is a demand for a code storage method in which the character display position and the code storage position correspond.

The present invention relates to a storage system for storing character data in a display device for displaying character data on a display screen.

[Conventional technology]

 FIG. 7 shows a conventional character data storage system.

Here, as the first method, as shown in FIG.
There has been a method of successively storing the character data indicating the display character directly in the storage means regardless of the character code and the control code.

Further, as a second method, as shown in FIG. 7 (2), in the case of storing in correspondence with the display position on the screen, a unique method of comparing the number of character codes with the display width on the display screen is used. There was a method of converting to the code and storing it.

[Problems to be solved by the invention]

In the above conventional technology, in which the character data is directly stored in the storage means without considering the correspondence between the character display position and the data storage position, the correspondence between the display position on the screen and the character data Therefore, it was necessary to calculate the positional relationship between the two. In particular, software that has not conventionally considered control codes such as shift codes often shares a pointer that indicates the storage position of data with a pointer that indicates the display position on the screen, and requires significant changes. there were.

On the other hand, in the case of using a unique code in order to correspond to the display position on the screen, it is necessary to perform sequential code conversion when reading and writing character data from an external file, and processing capacity is increased. It brought about the decrease of.

In view of the above problems, the present invention realizes a storage method for associating a display position on a screen with a character code without performing conversion processing to a unique code.

[Means for solving problems]

The present invention is a character data storage system for a display device, comprising a means for storing a code of character data representing a display character, for reading the character data and displaying the character on a display screen,
A plurality of code storage areas for storing the codes of the character data are provided, each having a storage unit corresponding to each display position of the display screen, and a character code indicating the display character is set to a predetermined one of the plurality of code storage areas. The character data storage method is characterized in that each of the code storage areas is stored in association with the display position of the display character.

[Action]

According to the present invention, when the code of character data for displaying characters is stored in the code storage area, the code of the character data is stored in the storage section of the code storage area corresponding to the character display position on the screen. Let Here, when the character data is composed of a plurality of codes, the sequential code is stored from a storage section of a predetermined code storage area among the corresponding storage sections of a plurality of code storage areas. As a result, even if the number of codes forming the character data is different, the correspondence between the character display position on the display screen and the code storage position on the storage means is achieved.

〔Example〕

 FIG. 1 shows an embodiment of the present invention.

In FIG. 1, the storage device 1 includes a normal character code storage area 2 and a sub character code storage area 3 as areas for storing codes of display characters.

Regular character code storage area 2 and sub character code storage area 3
Has a 1-byte storage unit corresponding to each display character on the display screen 4 for the number of display characters. For example, assuming that the display screen consists of 80 characters x 25 columns,
It has a storage unit corresponding to each display position, that is, 2000 character display positions.

Then, the first character string data consisting of a plurality of character data
The case of storing in the regular character code storage area 2 and the sub character code storage area 3 of the illustrated storage device 1 will be described below.

Here, assuming that the character code and control code constituting the character string data are, for example, JIS8 codes and shown in the code explanatory diagram of FIG. 2, each character code represents ASCII (half-width alphanumeric characters) and half-width katakana It is composed of byte character code and byte character code indicating full-width JIS Kanji and external characters. Further, SS2 and SS3 represent shift codes, that is, control codes, which are distinguished from other ASCII characters and JIS kanji character codes by being prefixed to a half-width katakana and a character code indicating an external character.

For example, if the code shown in FIG. 2 is stored as shown in the code storage operation explanatory diagram of FIG. 3, it is a half-width character.
When storing ASCII characters and half-width katakana, the normal character code is stored in the storage section of both the storage area 2 and the sub character code storage area 3 and corresponding to the display character position. In addition, when storing the JIS kanji and external character codes that are full-width characters, the full-width characters are displayed as 2 half-width characters, so both the normal character code storage area 2 and the sub-character code storage area 3 are equivalent to 2 bytes. The code is stored in the storage unit of.

As a result, the ASCII character code composed of 1 byte is stored only in the normal character code storage area 2, and the half-width kana character composed of 2 bytes is stored in both the normal character code storage area 2 and the sub character code storage area 3. Memorized in. Also, 2
The JIS Kanji code composed of bytes is stored only in the normal character code storage area 2, and the external character composed of 3 bytes including the shift code is stored in the normal character code storage area 2 bytes and the sub character code storage area 3 It is stored with 1 byte.

The flowchart of the above operation is shown in FIG. 4, and the operation of storing the code according to the flowchart shown in FIG. 4 is shown in FIG.

First, the stored character string data is represented by the input character string shown in FIG. 5, and the pointer is set in the storage unit of the normal character code storage area 2 corresponding to the display character position. Next, one code from the first code of the input character string is read and stored in the storage unit of the proper character code storage area 2 indicated by the pointer, and the pointer is advanced by one. At this time, if the stored code is a shift code, the next code is read and stored in the corresponding sub-character code storage area 3.

By repeating the above operation repeatedly until all the character data is stored, the normal character code storage area 2 and the sub character code storage area 3 of the storage device 1 correspond to the character display positions on the screen. Character data is stored.

Next, the sixth process of reading and outputting the codes stored in the regular character code storage area 2 and the sub character code storage area 3 is performed.
It is shown in the flowchart of figure code reading.

Here, it is assumed that the codes are previously stored as shown in the regular character code storage area 2 and the sub character code storage area 3 shown in FIG.

First, the pointer is set in the first storage section of the regular character code storage area 2, and the code is read from this pointer position.
If the shift code is read at this time, the code is read from the corresponding storage unit of the sub-character code storage area 3.
Each time a code for one character is read, it is displayed in correspondence with the storage unit of the regular character code storage area 2 in which the first code of the character was stored.

As a result, by performing this operation until a predetermined number of character data is output or until the reading of all the character data is completed, the characters are displayed corresponding to the position where the character data is stored. Be seen.

As described above, according to the present invention, by storing the code in association with the character display position on the screen, it is possible to correspond to the display screen by paying attention to the unique correspondence between the character display position and the code storage position. By providing a plurality of areas configured by the continuous storage section, the codes can be stored in correspondence with the character display positions even for character data having different code numbers.

In this embodiment, the code is stored by using the two areas indicated by the regular character code storage area and the sub character code storage area as the code storage area. However, the storage section corresponding to the display screen is used. The same operation can be performed by providing as many regions as the number of codes of the character data and storing the codes from the storage unit of a predetermined region among the storage units corresponding to the positions of the displayed characters.

Also, an example in which the JIS8 code is used as the code indicating the character data has been shown, but the present invention is not limited to this, and other code systems can be used to store the same.

〔The invention's effect〕

As described above in detail, according to the present invention, it becomes possible to store the character display position on the display screen and the storage position of the code indicating the character in association with each other, and the pointer indicating the predetermined character on the display screen. By sharing the character code with the pointer, complicated processing such as calculation processing and code conversion related to the correspondence between the both is unnecessary.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, FIG. 2 is a code explanatory diagram, FIG. 3 is a code storing operation explanatory diagram, FIG. 4 is a flowchart showing a code storing operation, and FIG. Explanatory drawing, FIG. 6 is a flow chart of code reading, and FIG. 7 is a drawing explaining a conventional character code storing method. In the drawings, 1 is a storage device, 2 is a regular character code storage area, 3 is a
Sub-character code storage area, 4 shows a display screen, respectively.

Claims (2)

[Claims] 1. A storage device provided with input means for inputting a character string, a screen for displaying characters, and a first storage area and a second storage area corresponding to the display width of the characters on the screen. And when the character code of each character of the character string input by the input means does not include a control code, the character code is stored in the first storage area, while when the control code is included, the control code is stored. Is stored in the first storage area and storage means for storing the remaining control code and character code that cannot be stored in the second storage area and / or the first storage area. Character data storage. 2. A screen for displaying a character is such that when only a character code is read from either the first storage area or the second storage area of the storage device, the character is displayed at a corresponding position on the screen. , While displaying the character represented by the character code and the control code at the corresponding position on the screen when the character code and the control code are read, respectively. The character data storage device according to item (1).