MATCHC

Purpose

to find substring (object) in character string

Format

opcode objlen.rw, objaddr.ab, srclen.rw, srcaddr.ab

Operation

search the string located on srcaddr for full string match of object

Condition codes

N ß 0;

V ßR0 EQL 0;

V ß 0;

C ß 0;

Exceptions

None

Opcodes

39        MATCHC                   Match Characters

Description

The source string specified by the source length and source address operands is searched for a substring which matches the object string specified by the object length and object ad dress operands. If the substring is found, the condition code Z bit is set; otherwise, it is cleared.

Notes

1. After Execution:

R0 = if a match occurred 0; otherwise the number of bytes in the object string.

Rl = if a match occurred, the address of one byte beyond the object string; otherwise the address of the object string.

R2 = if a match occurred, the number of bytes remaining in the source string after the match; otherwise 0.

R3 = if a match occurred, the address of 1 byte beyond

the last byte matched; otherwise the address of 1 byte

beyond the source

2. If both strings have zero length or if the object string has zero length, condition code Z is set just as though the substring were found.

3. If the source string has zero length and the object string has non-zero length, condition code Z is cleared just a though the substring were not found.