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16 lines
471 B
Plaintext
16 lines
471 B
Plaintext
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( r c -- r f )
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( Parse digit c and accumulate into result r.
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Flag f is 0 when c was a valid digit, 1 when c was WS,
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-1 when c was an invalid digit. )
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: _pdacc
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DUP 0x21 < IF DROP 1 EXIT THEN
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( parse char )
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'0' -
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( if bad, return "r -1" )
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DUP 0< IF DROP -1 EXIT THEN ( bad )
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DUP 9 > IF DROP -1 EXIT THEN ( bad )
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( good, add to running result )
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SWAP 10 * + ( r*10+n )
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0 ( good )
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;
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