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Routines |
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Used by the routine at Inglish_MatchClausePairs.
Compares one pair of clause bytes with the pair the caller addressed. An empty pair matches. Otherwise the low nibbles of the second bytes must agree and the first bytes must be equal. Both pointers then move on by two.
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| Inglish_CompareOneClausePair | 29230 | PUSH HL | Jump to Inglish_CompareOneClausePair_Advance if this pair is empty. | |
| 29231 | LD A,(HL) | |||
| 29232 | INC HL | |||
| 29233 | OR (HL) | |||
| 29234 | JR Z,Inglish_CompareOneClausePair_Advance | |||
| 29236 | LD A,(IY+1) | Read the second byte of the pair being tested. | ||
| 29239 | XOR (HL) | Jump to Inglish_CompareOneClausePair_Advance if its low nibble differs from the clause byte. | ||
| 29240 | AND 15 | |||
| 29242 | JR NZ,Inglish_CompareOneClausePair_Advance | |||
| 29244 | DEC HL | Step back to the first byte of the pair. | ||
| 29245 | LD A,(HL) | Read that first byte. | ||
| 29246 | CP (IY+0) | Compare it with the first byte of the pair being tested. | ||
| Inglish_CompareOneClausePair_Advance | 29249 | POP HL | Move on to the next pair in the text. | |
| 29250 | INC HL | |||
| 29251 | INC HL | |||
| 29252 | INC IY | Move on to the next pair being tested. | ||
| 29254 | INC IY | |||
| 29256 | RET | Return. | ||
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