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collapseos/blk/108

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: _ilen ( length of str in IBUF )
IBUF BEGIN C@+ EOL? UNTIL IBUF - 1- ;
: I
IBUF _type EDPOS @ 64 /MOD ( cno lno )
1+ 64 * _cpos ( cno next-line-ptr )
SWAP 63 -^ _ilen ( nlp nb-of-chars-to-move ilen )
2DUP > IF
SWAP OVER - 1+ ( nlp ilen nbc ) 0 DO ( a ilen )
SWAP 1- 2DUP -^ ( ilen a-1 a-ilen-1 ) C@ OVER C!
SWAP ( a ilen )
LOOP
ELSE DROP ( ilen becomes nbc )
THEN
SWAP DROP IBUF EDPOS @ _cpos ROT MOVE
;