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16 lines
480 B
Plaintext
16 lines
480 B
Plaintext
( returns negative value on error )
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: _ ( c -- n )
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DUP '0' '1' =><= IF '0' - EXIT THEN
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DROP -1 ( bad )
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;
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: _pb ( a -- n f, parse binary )
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( '0': ASCII 0x30 'b': 0x62 0x6230 )
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DUP 1+ @ 0x6230 = NOT IF 0 EXIT THEN ( a 0 )
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( We have "0b" prefix )
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DUP C@ ( a len )
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0 SWAP 1+ ( len+1 ) 3 DO ( a r )
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OVER I + C@ ( a r c ) _ ( a r n )
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DUP 0< IF 2DROP 0 UNLOOP EXIT THEN
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SWAP 1 LSHIFT + ( a r*2+n ) LOOP
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NIP 1 ;
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