collapseos/blk/429

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( Read one line in input buffer and make IN> point to it )
: (rdln)
( EOT or less triggers line flush )
(infl) BEGIN (rdlnc) 5 < UNTIL
LF IN( IN> ! ;
( And finally, implement C<* )
: RDLN<
IN> @ C@
DUP IF ( not EOL? good, inc and return )
1 IN> +!
ELSE ( EOL ? readline. we still return null though )
(rdln)
THEN
( update C<? flag )
IN> @ C@ 0 > 0x06 RAM+ ! ( 06 == C<? )
;