JPH0581233A - Character processing method - Google Patents

Abstract

(57) [Summary] [Purpose] The character string is displayed as is at the specified character string position.
Even if you overwrite the code, the meaningless character
Do not generate dead. [Structure] A Kanji flag indicating that it is a Kanji code,
The character code of the first byte of the kanji code or the front and back flags for distinguishing the character code of the second byte are added to the character code for each byte and stored in the storage device 11. -When reading a code from the storage device 11 and outputting it, a blank character code-
The code output determination unit 13 determines that the character code to be output is meaningless based on the kanji flag and the preceding and following flags added to the character code and two adjacent character codes. -, It is instructed to output a blank character code, and the character code conversion unit 14 outputs a blank character code.
If the output of the character code is not instructed, the character code is output as it is.If the output of the blank character code is instructed, the character code is converted to the blank character code. Output.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a character processing system,
In particular, the present invention relates to a character processing method for processing a mixture of 1-byte character code and 2-byte Kanji code.

[0002]

2. Description of the Related Art In a kanji area such as Japan, it is necessary to coexist with a 1-byte character code such as a number and an alphabet and a 2-byte kanji code, and a 1-byte character code and a 2-byte kanji code. Characters are mixed to form a character string and a display device or page is formed.
It is stored in a character storage unit such as a printer.

When a new character code is overwritten on a character string stored in the character storage unit, focusing on the 2-byte Kanji code, only the previous 1 byte or only the subsequent 1 byte is written. It may be rewritten. In such a case, the 1-byte character code or the 1-byte character code that remains without being rewritten becomes a meaningless code, and the wrong character may be displayed during character display or printing. There is a problem that it is printed.

Therefore, conventionally, before performing overwriting, the character code is read from the character storage unit, and it is judged whether or not a meaningless character code is included when the overwriting is performed. Performs overwriting and replaces the meaningless character code with a blank character code.

FIG. 6 is an explanatory diagram of a conventional overwriting process. Before overwriting, the contents shown in FIG. 6 (a) are stored and displayed in the character code storage unit 1 and the display screen 2. ing. Here, the Kanji flag is a 1-byte character
A 2-byte character code indicated by two consecutive ON-character flags is added to the code to indicate one 2-byte Kanji code.

In this state, the character code storage unit 1 stores, for example, a 1-byte character code "43" at address 1H.
When "H" (character code of alphabet C) is overwritten, it becomes as shown in FIG. 6 (b). In this case, address 2
H has the Kanji flag turned on, but the following address 3H is 1
Since it is a byte character code (Kanji flag is off), the content mnH (character code) of address 2H has no meaning and the display is incorrect.

Therefore, conventionally, before overwriting the 1-byte character code "43H" on the address 1H, the address 1H
Judge whether H or 2H is a 2-byte kanji code and
-In the case of C, 1 in address 1H as shown in FIG. 6 (c)
A byte character code "43H" is overwritten, and a 1-byte blank character code "20H" is added to the address 2H and overwritten. By doing this, address 2H
A blank is inserted at the display position of the display screen corresponding to, and incorrect display is not performed.

FIG. 7 is a block diagram of a display device that realizes the above-mentioned overwriting. Reference numeral 1 is a character code storage unit, 2 is a display screen of a CRT or the like, and 3 is a microcomputer-structured display for executing the overwriting process. The control unit 4 is a video memory (screen memory) that stores a character image for one screen.

[0009]

However, in the conventional method, the process of reading the character code from the character code storage unit before the overwriting, and the determination of whether a meaningless character code occurs due to the overwriting. The processing and the processing of adding a blank character code to the character string to be overwritten according to the determination result are required. Therefore, there is a problem that the overwriting process becomes complicated and the overwriting cannot be performed at high speed.

From the above, an object of the present invention is to perform character processing which does not require reading of character code, judgment of the result of overwriting, and addition of a blank character code according to the judgment result prior to overwriting. It is to provide a method. Another object of the present invention is to provide a character processing method capable of preventing a meaningless character code from being generated at the time of reading even if a character code is overwritten at a position of a designated character string as it is. That is. Still another object of the present invention is to provide a character processing system that allows overwriting easily and at high speed.

[0011]

FIG. 1 illustrates the principle of the present invention. Reference numeral 11 is a storage device for storing a mixture of 1-byte character code and 2-byte kanji code, 11a-1 is a character code memory for storing a character code, and 11a-2 is a character code. 11a-3 is a front-back flag memory for storing the front-back flag for distinguishing the first byte or the second byte of the kanji code, and 12a is a 1-byte blank character code. The generation unit 13 determines whether the character code to be output is a meaningless character code, and if it is a meaningless character code, a blank character code for instructing the output of a blank character code. A code output determination unit 14 outputs a character code read from the storage device 11 as it is according to an instruction from the blank character code output determination unit, or a character code output by replacing it with a blank character code. It is a conversion unit.

[0012]

Operation: A Kanji flag indicating that it is a Kanji code and a front and back flag for distinguishing the character code of the first byte or the character code of the second byte of the Kanji code are provided for each byte. When the character code is read from the memory device 11 and output for each byte, the blank character code output determination unit 13 causes the character code to be added to the character code. It is determined whether the character code to be output is a meaningless character code based on the Kanji flag and the preceding and succeeding flags added to each of the two character codes adjacent to the code, and it is meaningless. If there is, the blank character code is instructed to be output. If the blank character code output is not instructed, the character code conversion unit 14 outputs the character code read from the storage device 11 as it is. However, if output of a blank character code is instructed, enter the character code. White character code - the output is converted to de.

As described above, when the character code is read from the storage device and output, it is determined whether or not the character code to be read is meaningless. It is output by replacing it with a code, and if it is meaningless, it is output as it is, so when overwriting, the character code is overwritten as it is at the specified character string position without considering anything. In addition, it is possible to prevent a meaningless character code from being generated at the time of reading. That is, the reading of the character code prior to overwriting, the judgment of the overwriting result, and the additional processing of the blank character code according to the judgment result, which are required in the conventional method, are unnecessary, and simply, And it is possible to overwrite at high speed.
Further, it is possible to make a judgment whether or not it is meaningless in a hard manner by a logic circuit, and the reading speed does not decrease.

[0014]

EXAMPLES In the overall configuration diagram 2 is an embodiment diagram of the present invention, it is denoted by the same reference numerals as in FIG. 1. In the figure, reference numeral 11 is a storage device for storing a 1-byte character code and a 2-byte kanji code in a mixed manner, a character code storage section 11a, and a switching circuit 11b for switching between a write address and a read address. It has a read address counter 11c that sequentially generates read addresses.

The character code storage unit 11a stores a 1-byte character code and a 2-byte Kanji code (Kanji code is 2
Character code to be divided into one 1-byte character code and stored)
A memory 11a-1 and a Kanji flag memory 11a-2 for storing a Kanji flag attached to each 1-byte character code, and the first or second character code of the Kanji code. A front / rear flag memory 11a-3 for storing a front / rear flag for distinguishing whether the character code is a character code is provided.

The relationship between the character code, the kanji flag and the front and back flags is as shown in FIG. 3. (1) In the case of a 1-byte character code such as a numeral or alphabet, the kanji flag is off ("
0 "), the front and back flags are optional (don't care), (2) In the case of the first character of the 2-byte Kanji code (the previous 1-byte character code), both the Kanji flag and the front and back flags are turned on ("
1 "), (3) In the case of the second character of the 2-byte Kanji code (later 1-byte character code), the Kanji flag is on ("
1 ") and the front and rear flags are off (" 0 ").

Reference numeral 12 denotes a blank character code generation unit for generating a 1-byte blank character code, and reference numeral 13 determines whether the character code to be output is a meaningless character code. If it is a character code, a blank character code output determination unit for instructing the output of a blank character code, and 14 is a character code read from the storage device 11 according to an instruction from the blank character code output determination unit. Is output as it is, or a blank character code is output. A character code conversion unit 15 is a two-stage storing two latest character codes read from the character code memory 11a-1. It is a buffer unit having a shift register configuration.

Blank character code output determination unit The blank character code output determination unit 13 sets the address of the 1-byte character code to be read as n,
A three-stage latch circuit section 13a for storing the Kanji flag and the preceding and following flags of the character code stored at the address n and the addresses n-1 and n + 1 (three adjacent addresses) before and after the address n, and the address n-1 , N, n + 1, it is determined whether the character code of the address n to be output is a meaningless character code based on the Kanji flag and the preceding and succeeding flags of the character code, and it is meaningless. If there is, a judgment section 13b for instructing the output of the blank character code is provided.

In the latch circuit section 13a, the FF11,
FF12 is a latch circuit that stores the Kanji flag and the previous / next flag of the address n-1, FF21 and FF22 are latch circuits that store the Kanji flag and the previous / next flag of the address n, respectively, and FF31 and FF32 are the Kanji flag and the previous / next flag of the address n + 1. Are stored in the latch circuit, and the contents of each latch circuit are sequentially shifted to the right every time a new Kanji flag and a previous / next flag are read from the memory.

The judging section 13b includes a number of logic gates 13
b-1 to 13b-4, a low level blank character enable signal * BCI is output if the blank character output condition (described later) shown in FIG. 4 is satisfied, and if it is not satisfied, the blank character enable signal * BCI is output. *
Bring BCI high. 13b-1 and 13b-2 are AND gates with one negative input, and 13b-3 are NOT gates.
13b-4 is ogate.

Character code conversion unit The character code conversion unit 14 includes an AND gate 14a having one negative input for each bit and an AND gate 14a.
Although it is not shown in the figure, it is provided for 1 byte (8 bits) in practice. When the blank character enable signal * BCI is at a high level, the character code conversion unit 14 outputs the character code of the address n stored in the buffer unit 15 as it is, and the blank character enable signal is output. Address n when signal * BCI is low level
The character code of is replaced with a blank character code for output.

Blank Character Output Condition It is determined according to FIG. 4 whether the character code to be read is output as it is or is output as a blank character code. The address of the 1-byte character code to be read is n, and the addresses before and after it are n-1 and n + 1.

(1) If both the Kanji flag and the before / after flag of the address n are on and both the Kanji flag and the before / after flag of the address n + 1 are on, the character code at the address n is replaced with a blank character code. Output. This is shown in Figure 5 (a).
As shown in FIG. 2, when the 2-byte Kanji code is stored in the first addresses n and n + 1, the address n +
In this state, another 2-byte Kanji code (dotted line) is overwritten on 1, n + 2. In such a state, the character code of address n becomes meaningless. Therefore, the character code of the address n is replaced with the blank character code for output.

(2) When both the kanji flag of address n and the preceding and following flags are on and the kanji flag of address n + 1 is off, the character code of address n is replaced with a blank character code and output. As shown in FIG. 5 (b), the 1-byte character code (dotted line) is overwritten at the address n + 1 in the state where the 2-byte Kanji code is initially stored at the addresses n and n + 1. In this state, the character code of the address n becomes meaningless.
Therefore, the character code of the address n is replaced with the blank character code for output.

(3) When both the Kanji flag and the before and after flag of the address n are on, the Kanji flag of the address n + 1 is on and the before and after flag is off, the character code of the address n is output as it is. This is a state in which a 2-byte Kanji code is stored at addresses n and n + 1 as shown in FIG. 5C, and the character code at address n is the first of the 2-byte Kanji code. Is the character code. Therefore, the character code of the address n is output as it is.

(4) When the kanji flag of address n is off, the character code of address n is output as it is. This is a state in which a 1-byte character code is stored in the address n, as shown in FIG. 5 (d). Therefore, the character code of the address n is output as it is.

(5) When both the kanji character flag and the before and after flag of the address n-1 are on, the kanji flag of the address n is on, and the before and after flag is off, the character code of the address n is output as it is. As shown in FIG. 5 (e), this is a state in which a 2-byte Kanji code is stored at addresses n-1 and n, and the character code at address n is a 2-byte Kanji code. It is the second character code. Therefore, the character code of the address n is output as it is.

(6) If the kanji flag of address n-1 is off, the kanji flag of address n is on, and the front and back flags are off, replace the character code of address n with a blank character code. Output. As shown in FIG. 5 (f), when a 2-byte Kanji code is initially stored at addresses n-1 and n, a 1-byte character code (dotted line) is stored at address n-1. It is in the state of being overwritten, and in such a state, the character code of the address n becomes meaningless. Therefore, the character code of address n is a blank character code.
Replace with the output.

(7) The kanji flag of address n-1 is turned on,
The front and back flags are off, the kanji flag at address n is on,
When the front-back flag is off, the character code of the address n is replaced with a blank character code and output. This is
As shown in (g), when the 2-byte Kanji code is initially stored in the addresses n-1 and n, the address n
In this state, another 2-byte Kanji code (dotted line) is overwritten on -2 and n-1. In such a state, the character code of the address n becomes meaningless. Therefore, the address n
The character code of is replaced with a blank character code and output.

From the above, the determination unit 13b in FIG.
When the conditions (3), (4), and (5) are satisfied, a high-level blank character enable signal * BCI is output, and (3),
When the conditions (4) and (5) are not satisfied, in other words, when the conditions (1), (2), (6) and (7) above are satisfied, the It is configured to output a -level blank character enable signal * BCI. That is, Andge
The output of the gate 13b-1 becomes high level when the condition (5) is satisfied, the output of the and gate 13b-2 becomes high level when the condition (3) is satisfied, and the output of the not gate 13b-3. Is configured to go high when condition (4) is met.

Overall operation (a) Overwriting operation When a character code is overwritten at a predetermined position of the character code storage unit 11a, a writing address indicating the overwriting position in the storage device 11 and an overwriting operation are performed. Input the character code to be written, the Kanji flag and the previous / next flag of the character code, and enter the character code memory 11a-1, the Kanji flag memory 11a-2, and the previous / next flag memory 11a-3 indicated by the write address. The character code, the kanji flag, and the preceding and following flags are stored in the position.

(B) Read operation When the character code at address n is read from the storage device 11 and output, the character code at addresses n-1, n, n + 1 is read.
The Kanji flag and the before / after flag attached to the code are read from the Kanji flag memory 11a-2 and the before / after flag memory 11a-3 and stored in the latch circuit section 13a, and at the same time, from the character code memory 11a-1 at addresses n and n + 1. The character code is read and stored in the buffer unit 15.

The latch circuit section 13a sequentially shifts the contents of the latch circuits FF11 to FF32 to the right every time a new Kanji flag and front and rear flags are read from the memories 11a-2 and 11a-3, and the latest 3 The Kanji flag and the preceding and following flags of two adjacent addresses are stored.
In the buffer section 15, the character code is stored in the character code memory 11
The latest two character codes are stored while shifting to the right every time a-1 is read.

Therefore, the address n is input to the latch circuit section 13a.
In the state where the character code at address n-1, n is stored in the buffer section 15, the respective flag of -2, n-1, n are set to the character code at address n + 1, the kanji flag, and the previous / next flag. When read from the character code storage unit 11a, the Kanji flag at addresses n-1, n, n + 1 and the preceding and succeeding flags are stored in the latch circuit unit 13a, and the buffer unit 15 stores the character code at addresses n, n + 1. To be done.

In this state, the determination unit 13b of the blank character code output determination unit 13 receives the Kanji character flags and the preceding and succeeding flags of the three adjacent addresses read by the latch circuit unit 13a, and the character code of the address n is input. -If the conditions (3) to (5) for outputting the output as it is are satisfied, the blank character enable signal * BCI is set to the high level, and if not satisfied, the blank character enable signal * BCI is output. BCI low
To level.

When the blank character enable signal * BCI is at a high level, that is, when the blank character code output is not instructed, the character code conversion unit 14 outputs the character code memory 11a. -1 outputs the character code of the address n read to the buffer unit 15 as it is, and when the blank character enable signal * BCI is low level, that is, the output of the blank character code is instructed. If so, the character code is replaced with a blank character code and output.

Thereafter, the character code of the next address n + 2,
The Kanji flag and the preceding and following flags are read from the character storage unit 11a and stored in the buffer unit 15 and the latch circuit unit 13a while being shifted, and the same processing as above is performed to perform the address n +.
The character code of 1 is output as it is, or is replaced with a blank character code and output. Then, thereafter, character codes are sequentially output in the same manner.

The present invention has been described above with reference to the embodiments.
The present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these modifications.

[0039]

As described above, according to the present invention, when a character code is read from a storage device and output, it is determined whether or not the character code to be read is meaningless and meaningless. If so, it is output by replacing it with a blank character code, and if it is meaningless, it is output as it is. The characters can be overwritten, and in addition, meaningless character codes can be prevented from being generated at the time of reading. Therefore, according to the present invention, the reading of the character code prior to the overwriting, the judgment of the overwriting result, and the additional processing of the blank character code according to the judgment result are unnecessary.
Overwriting can be done easily and at high speed.

Further, according to the present invention, it can be determined whether or not it is meaningless by a logic circuit at a high speed in a hardware manner, and the reading speed is not lowered.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a relationship chart of a character code, a Kanji flag, and a front-back flag.

FIG. 4 is a chart for explaining blank character output conditions.

FIG. 5 is an explanatory diagram of blank character output conditions.

FIG. 6 is an explanatory diagram of conventional overwrite processing.

FIG. 7 is a configuration diagram of a display device.

[Explanation of symbols]

 11-Storage device 11a-1-Character code memory 11a-2-Kanji flag memory 11a-3-Previous flag memory 12-Blank character code generator 13- Part 14 ... Character code conversion unit

Claims (1)

[Claims] 1. A 1-byte character code and a 2-byte Kanji code
In a character processing method for processing mixed code, it is a kanji flag indicating that it is a kanji code and either the first byte of the kanji code or the second byte of the kanji code. When a character code is read from the storage device byte by byte and output, the character code to be output and the character code are stored. It is determined whether the character code to be output is a meaningless character code based on the Kanji flag and the preceding and succeeding flag added to each of the character codes adjacent to the code. In case of a character code, the character code to be outputted is converted into a blank character code and outputted, and when it is not a meaningless character code, it is outputted as it is. Character processing method.