JP2940976B2 - Specific character processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] In a computer system provided with a translation test instruction, a specific character processing method in a character string that performs processing according to a specific character in the character string is described. In order to speed up the calling process of each processing unit corresponding to the specified character processing unit, a plurality of specific character corresponding processing units that perform processing related to specific characters in a character string, and the addresses of each specific character corresponding processing unit are arranged in an array. A stored address table, a conversion table defined so that the value of the position corresponding to the code of the specific character is an element number from the head of the array in the address table, and a translation test instruction specifying the conversion table. Issue a specific character correspondence processing unit that obtains the address of the corresponding specific character correspondence processing unit from the address table with the value obtained thereby, and calls the specific character correspondence processing unit. And a processing unit calling unit.

[Industrial applications]

The present invention relates to a method for processing a specific character in a character string that performs processing according to a specific character in the character string in a computer system having a translation test (TRT: TRANSLATE ANDTEST) instruction.

[Conventional technology]

 FIG. 6 shows an example of the prior art.

In a computer system, when a specific character is present in a character string, processing according to the specific character may need to be performed.

For example, there is a character string 60 as shown in FIG. 6, in which a specific character code of X'01 ', X'02' or X'03 '(X'xx' represents a hexadecimal number) is included. When it is found, it is searched for and the processing for each specific character is performed.

In the prior art, as in a specific character determination processing unit 61 shown in FIG. 6, one character is extracted from the beginning of a character string 60 one by one, and the character is X'01 ', X'02', or X'03 '. Are determined sequentially, and if so, the predetermined processing 1, processing 2, and processing 3 are called according to the character code.

[Problems to be solved by the invention]

In the prior art, when a specific character in a character string must be processed with respect to each specific character, a decision statement is used as shown in FIG.
I had to judge each letter. Therefore,
When there are many types of specific characters or when a character string is long, there is a problem that processing performance is poor.

By the way, in a relatively large computer, a translation test instruction (hereinafter referred to as TRT) is used as an instruction to convert characters using a conversion table.
Instructions). This instruction has the following functions, as is well known.

The character string pointed to by the first operand is checked using the conversion table indicated by the second operand, and if there is an appropriate result, the value is set in a specific general-purpose register and the condition code is set. Is done. Execution of this instruction is performed as follows.

The argument byte of the first operand is added to the second operand address. The addition is performed in the same manner as the address calculation, and the upper part of the argument byte is extended by filling it with zero.

One byte of the conversion table is read based on the address of the result of the addition.

When read, it is checked whether one byte of the conversion table is zero. If the result is zero, the processing is continued, and the conversion table is referred to by the next argument byte.

When one byte of the read conversion table is non-zero,
Processing ends. Then, the address of the argument byte that has detected one byte of the conversion table other than zero is stored in the general-purpose register R1. One byte of the conversion table or the general-purpose register R2 is stored.

 Condition codes 0, 1, and 2 are set according to the result.

In the prior art, this TRT instruction has not been used to detect a specific character and invoke processing relating to the specific character.

According to the present invention, when performing processing relating to a specific character in a character string, by using a TRT instruction without using a judgment statement, a search for a specific character and a calling process of each processing unit according to the specific character can be performed. The purpose is to speed up.

[Means for solving the problem]

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

In FIG. 1, reference numeral 10 denotes a data processing device including a CPU and a memory, 11 denotes a character string buffer for storing a character string that may include a specific character, 12 denotes a conversion table used in a TRT instruction, and 13 denotes each specific character. An address table in which addresses of destinations of processes related to the specific characters are stored, reference numeral 14 denotes a specific character corresponding processing unit calling unit, and reference numerals 15a to 15z each denote a specific character corresponding processing unit which performs processing relating to each specific character.

The data processing device 10 associates the characters in the character string with the conversion table 12, and stops scanning the character string when a specific value is obtained from the conversion table 12, and obtains the character string from the conversion table 12. It has a function to execute a translation test (TRT) instruction that returns a value.

The character string buffer 11 is an area for storing a character string to be searched for a specific character.

Each of the specific character correspondence processing units 15a, 15b,... Is a program for performing processing relating to a predetermined specific character.

The address table 13 stores the addresses of these specific character correspondence processing units 15a to 15z in an array.

The conversion table 12 has a value defined such that the value at the position corresponding to the code of the specific character is the element number from the head of the array in the address table 13. The byte value at the position that does not correspond to a specific character is zero.

The specific character corresponding processing unit calling unit 14 issues a translation test (TRT) instruction by designating the conversion table 12, and obtains one of the corresponding specific character corresponding processing units 15 a to 15 z from the address table 13 with the obtained value. One address is obtained, and processing for calling the specific character correspondence processing units 15a to 15z is performed.

[Action]

At the position of a specific character in the 256-byte conversion table 12 for the TRT instruction, a specific character processing unit 15a-1 that processes that character
Each element number of 5z, that is, the position of the array in the address table 13 is set. By specifying this conversion table 12, TRT
The character string in the character string buffer 11 is searched by the instruction.

If there is a specific character, the TRT instruction returns one element number of the specific character correspondence processing unit 15a to 15z that processes the character, and using that value, obtains the address from the address table 13 and The specific character correspondence processing units 15a to 15z are called.

This makes it possible to execute the processing relating to the specific character at high speed without using the judgment statement.

〔Example〕

FIG. 2 is an example of a specific character in one embodiment of the present invention, FIG. 3 is a setting example of a conversion table according to one embodiment of the present invention, and FIG. 4 is an address table setting according to one embodiment of the present invention. For example,
FIG. 5 shows a processing flow of an embodiment of the present invention.

For example, when recognizing a terminal full screen order from input / output data to a terminal device and then creating a TTY terminal order, it is necessary to check the order of specific characters. Figure 2 shows the terminal free screen order character string
20 shows an example of an order included in 20.

The specific character of character code X'11 'is set buffer address SBA, the specific character of X'1B' is set field (extended) SF / E, the specific character of X'13 'is cursor positioning IC, X'
The specific character 1D 'indicates the set field SF, X'3C', and the specific character indicates the order of the repeat to address RA.

In the case where these orders are detected from the terminal full-screen order character string 20 and processing corresponding to each order is performed, for example, in order to create a TTY terminal order, in the related art, 1
Each character is determined whether it is a specific character and its processing routine is called.

In the present invention, a conversion table 12 as shown in FIG. 3 and an address table 13 as shown in FIG. 4 are prepared, and a subroutine for processing each specific character is called by using a TRT instruction.

The conversion table 12 is a table having a size of 256 bytes, and has, as shown in FIG. 3, an identification number of a subroutine for processing the specific character at a position corresponding to the value of the specific character. . Zeros are stored in positions that do not correspond to the value of the specific character.

For example, the identification number of the SBA subroutine is 01, and the identification number 01 is set at the position of the SBA order value X'11 '(the 17th position from the head) in the conversion table 12. Similarly, since the value of the IC order is X'13 ', at the position of the 19th byte (13th hexadecimal number) from the head of the conversion table 12,
Identification number 04 of the IC subroutine that processes the IC order
Is set.

As shown in FIG. 4, the addresses of subroutines for processing each order are stored in the address table 13 in the order of their identification numbers. For example, since the identification number of the SBA subroutine is 01, the address of the SBA subroutine is set in the first entry of the address table 13. Since the identification number of the SF subroutine is 02, the address of the SF subroutine is set in the second entry. Others are the same.

The specific character correspondence processing unit calling unit 14 shown in FIG. 1 performs the processing shown in FIG. 5 by using the conversion table 12 and the address table 13.

First, a TRT instruction is issued by designating the terminal full-screen order character string 20 shown in FIG. 2 and the conversion table 12 shown in FIG. Condition code CC set by issuing this instruction
Is as follows.

 CC = 0: All the bytes of the conversion table 12 read are zero.

CC = 1: A nonzero byte of conversion table 12 was found before the last byte of the first operand.

CC = 2: One byte of non-zero conversion table 12 was found in the last byte of the first operand.

Determines the condition code and checks whether an order for a specific character has been detected. When detected, the position (identification number of the subroutine) in the array of general-purpose registers R2 is returned, so the subroutine is obtained from the address table 13 shown in FIG. 4 and the address is set in the register R15.
Then, the subroutine is called by a connection branch (BALR) instruction.

When the processing of the specific character is completed by the order processing subroutine 50, it is determined whether or not the search is still necessary. If a search is required, the pointer is advanced to the next character position in the terminal full-screen order character string 20 shown in FIG. . When the search has been completed for all of the terminal full-screen order character strings 20, the processing ends.

〔The invention's effect〕

As described above, according to the present invention, even if the number of specific characters increases, the performance does not deteriorate. In addition, even when the number of specific characters increases due to the function expansion, the part that calls the processing of the specific characters can be easily modified because only the conversion table and address table need to be changed and the program instructions do not need to be changed. , Contribute to quality improvement.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is an example of a specific character in one embodiment of the present invention, FIG. 3 is a setting example of a conversion table according to one embodiment of the present invention, and FIG. FIG. 5 shows a processing flow of an embodiment of the present invention, and FIG. 6 shows an example of the prior art according to an embodiment of the present invention. In the figure, 10 is a data processing device, 11 is a character string buffer, 12 is a conversion table, 13 is an address table, 14 is a specific character correspondence processing unit calling unit, and 15a to z represent specific character correspondence processing units.

Claims (1)

(57) [Claims] In a specific character processing device having a translation test instruction for returning a predetermined value from a conversion table corresponding to a character code, a plurality of specific character correspondence processing units for performing processing relating to specific characters in a character string are provided. An address table storing addresses of the specific character correspondence processing units; a conversion table for associating a value corresponding to the code of the specific character with each address stored in the address table; A specific character processing unit calling unit for calling a corresponding specific character processing unit from the address table with a value obtained by a designated translation test instruction.