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Added string library

    1: \ dynamic string handling                              10aug99py
    2: 
    3: : delete   ( buffer size count -- )
    4:   over min >r  r@ - ( left over )  dup 0>
    5:   IF  2dup swap dup  r@ +  -rot swap move  THEN  + r> bl fill ;
    6: 
    7: : insert   ( string length buffer size -- )
    8:   rot over min >r  r@ - ( left over )
    9:   over dup r@ +  rot move   r> move  ;
   10: 
   11: : $padding ( n -- n' )
   12:   [ 6 cells ] Literal + [ -4 cells ] Literal and ;
   13: : $! ( addr1 u addr2 -- )
   14:   dup @ IF  dup @ free throw  THEN
   15:   over $padding allocate throw over ! @
   16:   over >r  rot over cell+  r> move 2dup ! + cell+ bl swap c! ;
   17: : $@len ( addr -- u )  @ @ ;
   18: : $@ ( addr1 -- addr2 u )  @ dup cell+ swap @ ;
   19: : $!len ( u addr -- )
   20:   over $padding over @ swap resize throw over ! @ ! ;
   21: : $del ( addr off u -- )   >r >r dup $@ r> /string r@ delete
   22:   dup $@len r> - swap $!len ;
   23: : $ins ( addr1 u addr2 off -- ) >r
   24:   2dup dup $@len rot + swap $!len  $@ 1+ r> /string insert ;
   25: : $+! ( addr1 u addr2 -- ) dup $@len $ins ;
   26: : $off ( addr -- )  dup @ free throw off ;
   27: 
   28: \ dynamic string handling                              12dec99py
   29: 
   30: : $split ( addr u char -- addr1 u1 addr2 u2 )
   31:   >r 2dup r> scan dup >r 1 /string 2swap r> - 2swap ;
   32: 
   33: : $iter ( .. $addr char xt -- .. ) { char xt }
   34:   $@ BEGIN  dup  WHILE  char $split >r >r xt execute r> r>
   35:      REPEAT  2drop ;