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Annotation of gforth/string.fs, revision 1.3

1.1       pazsan      1: \ dynamic string handling                              10aug99py
                      2: 
1.3     ! anton       3: \ Copyright (C) 2000 Free Software Foundation, Inc.
        !             4: 
        !             5: \ This file is part of Gforth.
        !             6: 
        !             7: \ Gforth is free software; you can redistribute it and/or
        !             8: \ modify it under the terms of the GNU General Public License
        !             9: \ as published by the Free Software Foundation; either version 2
        !            10: \ of the License, or (at your option) any later version.
        !            11: 
        !            12: \ This program is distributed in the hope that it will be useful,
        !            13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: \ GNU General Public License for more details.
        !            16: 
        !            17: \ You should have received a copy of the GNU General Public License
        !            18: \ along with this program; if not, write to the Free Software
        !            19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: 
1.1       pazsan     21: : delete   ( buffer size count -- )
                     22:   over min >r  r@ - ( left over )  dup 0>
                     23:   IF  2dup swap dup  r@ +  -rot swap move  THEN  + r> bl fill ;
                     24: 
                     25: : insert   ( string length buffer size -- )
                     26:   rot over min >r  r@ - ( left over )
                     27:   over dup r@ +  rot move   r> move  ;
                     28: 
                     29: : $padding ( n -- n' )
                     30:   [ 6 cells ] Literal + [ -4 cells ] Literal and ;
                     31: : $! ( addr1 u addr2 -- )
                     32:   dup @ IF  dup @ free throw  THEN
                     33:   over $padding allocate throw over ! @
                     34:   over >r  rot over cell+  r> move 2dup ! + cell+ bl swap c! ;
                     35: : $@len ( addr -- u )  @ @ ;
                     36: : $@ ( addr1 -- addr2 u )  @ dup cell+ swap @ ;
                     37: : $!len ( u addr -- )
                     38:   over $padding over @ swap resize throw over ! @ ! ;
                     39: : $del ( addr off u -- )   >r >r dup $@ r> /string r@ delete
                     40:   dup $@len r> - swap $!len ;
                     41: : $ins ( addr1 u addr2 off -- ) >r
                     42:   2dup dup $@len rot + swap $!len  $@ 1+ r> /string insert ;
                     43: : $+! ( addr1 u addr2 -- ) dup $@len $ins ;
                     44: : $off ( addr -- )  dup @ free throw off ;
                     45: 
                     46: \ dynamic string handling                              12dec99py
                     47: 
                     48: : $split ( addr u char -- addr1 u1 addr2 u2 )
1.2       pazsan     49:   >r 2dup r> scan dup >r dup IF  1 /string  THEN
                     50:   2swap r> - 2swap ;
1.1       pazsan     51: 
                     52: : $iter ( .. $addr char xt -- .. ) { char xt }
                     53:   $@ BEGIN  dup  WHILE  char $split >r >r xt execute r> r>
                     54:      REPEAT  2drop ;