Routines |
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The READ command allows for the reading of a DATA list and has an effect similar to a series of LET statements.
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READ_3 | 07660 | RST 32 | Come here on each pass, after the first, to move along the READ statement. | |
The address of this entry point is found in the parameter table.
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READ | 07661 | CALL CLASS_01 | Consider whether the variable has been used before; find the existing entry if it has. | |
07664 | CALL SYNTAX_Z | Jump forward if checking syntax. | ||
07667 | JR Z,READ_2 | |||
07669 | RST 24 | Save the current pointer CH-ADD in X-PTR. | ||
07670 | LD (23647),HL | |||
07673 | LD HL,(23639) | Fetch the current DATA list pointer (DATADD) and jump forward unless a new DATA statement has to be found. | ||
07676 | LD A,(HL) | |||
07677 | CP "," | |||
07679 | JR Z,READ_1 | |||
07681 | LD E,228 | The search is for 'DATA'. | ||
07683 | CALL LOOK_PROG | Jump forward if the search is successful. | ||
07686 | JR NC,READ_1 | |||
Report E - Out of DATA.
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07688 | RST 8 | Call the error handling routine. | ||
07689 | DEFB 13 | |||
Continue - picking up a value from the DATA list.
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READ_1 | 07690 | CALL TEMP_PTR1 | Advance the pointer along the DATA list and set CH-ADD. | |
07693 | CALL VAL_FET_1 | Fetch the value and assign it to the variable. | ||
07696 | RST 24 | Fetch the current value of CH-ADD and store it in DATADD. | ||
07697 | LD (23639),HL | |||
07700 | LD HL,(23647) | Fetch the pointer to the READ statement from X-PTR and clear it. | ||
07703 | LD (IY+38),0 | |||
07707 | CALL TEMP_PTR2 | Make CH-ADD once again point to the READ statement. | ||
READ_2 | 07710 | RST 24 | Get the present character and see if it is a ','. | |
07711 | CP "," | |||
07713 | JR Z,READ_3 | If it is then jump back as there are further items; otherwise return via either CHECK_END (if checking syntax) or the 'RET' instruction (to STMT_RET). | ||
07715 | CALL CHECK_END | |||
07718 | RET |
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