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num-var = SPF_INS(line-ptr, col-num, data-str)
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Operands:
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line-ptr
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the line pointer for the data line to be modified
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col-num
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the column number at which the str-var contents are to be inserted.
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data-str
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the text string to be inserted
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Returns:
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Both num-var and RC will be 0 and Msg$ will be "" (Null) for successful completion
Both num-var and RC will be 8 and Msg$ set to an error message on failure (e.g. invalid line pointer)
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Special Notes:
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Will insert str-var into the text of line-ptr at the indicated column col-num. Current text from col-num to the end of line will be shifted right to allow insertion of data-str. If needed, the line's text will be extended with blanks to col-num - 1 before data-str is copied in.
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