Diff for /gforth/blocks.fs between versions 1.19 and 1.22

version 1.19, 1998/12/08 22:02:36 version 1.22, 1999/03/23 20:24:16
Line 75  Defer flush-blocks Line 75  Defer flush-blocks
   
 \ the file is opened as binary file, since it either will contain text  \ the file is opened as binary file, since it either will contain text
 \ without newlines or binary data  \ without newlines or binary data
 : get-block-fid ( -- fid )  : get-block-fid ( -- fid ) \ gforth
     block-fid @ 0=      block-fid @ 0=
     if      if
         s" blocks.fb" open-blocks          s" blocks.fb" open-blocks
     then      then
     block-fid @ ;      block-fid @ ;
   
 : block-position ( u -- )  : block-position ( u -- ) \ block
     \ positions the block file to the start of block u      \G Position the block file to the start of block @var{u}.
     1- chars/block chars um* get-block-fid reposition-file throw ;      1- chars/block chars um* get-block-fid reposition-file throw ;
   
 : update ( -- )  : update ( -- ) \ block
     last-block @ ?dup IF  buffer-dirty on  THEN ;      last-block @ ?dup IF  buffer-dirty on  THEN ;
   
 : save-buffer ( buffer -- ) >r  : save-buffer ( buffer -- ) \ gforth
       >r
     r@ buffer-dirty @ r@ buffer-block @ 0<> and      r@ buffer-dirty @ r@ buffer-block @ 0<> and
     if      if
         r@ buffer-block @ block-position          r@ buffer-block @ block-position
Line 98  Defer flush-blocks Line 99  Defer flush-blocks
     endif      endif
     rdrop ;      rdrop ;
   
 : empty-buffer ( buffer -- )  : empty-buffer ( buffer -- ) \ gforth
     buffer-block off ;      buffer-block off ;
   
 : save-buffers  ( -- )    block-buffers @  : save-buffers  ( -- ) \ block
       block-buffers @
     buffers 0 ?DO  dup save-buffer  next-buffer  LOOP  drop ;      buffers 0 ?DO  dup save-buffer  next-buffer  LOOP  drop ;
   
 : empty-buffers ( -- )    block-buffers @  : empty-buffers ( -- ) \ block
       block-buffers @
     buffers 0 ?DO  dup empty-buffer  next-buffer  LOOP  drop ;      buffers 0 ?DO  dup empty-buffer  next-buffer  LOOP  drop ;
   
 : flush ( -- )  : flush ( -- ) \ block
     save-buffers      save-buffers
     empty-buffers ;      empty-buffers ;
   
 ' flush IS flush-blocks  ' flush IS flush-blocks
   
 : get-buffer ( n -- a-addr )  : get-buffer ( n -- a-addr ) \ gforth
     buffers mod buffer-struct %size * block-buffers @ + ;      buffers mod buffer-struct %size * block-buffers @ + ;
   
 : block ( u -- a-addr )  : block ( u -- a-addr ) \ block- block
     \G @var{u} identifies a block number. Assign a block buffer to @var{u},
     \G make it the current block buffer and return its start
     \G address, @var{a-addr}.
     dup 0= -35 and throw      dup 0= -35 and throw
     dup get-buffer >r      dup get-buffer >r
     dup r@ buffer-block @ <>      dup r@ buffer-block @ <>
Line 134  Defer flush-blocks Line 140  Defer flush-blocks
     then      then
     r> dup last-block ! block-buffer ;      r> dup last-block ! block-buffer ;
   
 : buffer ( u -- a-addr )  : buffer ( u -- a-addr ) \ block
     \ reading in the block is unnecessary, but simpler      \ reading in the block is unnecessary, but simpler
     block ;      block ;
   
 User scr 0 scr !  User scr ( -- a-addr ) \ block-ext
       \G USER VARIABLE @var{a-addr} is the address of a cell containing
       \G the block number of the block most recently processed by
       \G @code{LIST}.
       0 scr !
   
 : updated?  ( n -- f )   scr @ buffer  : updated?  ( n -- f ) \ gforth
       scr @ buffer
     [ 0 buffer-dirty 0 block-buffer - ] Literal + @ ;      [ 0 buffer-dirty 0 block-buffer - ] Literal + @ ;
   
 : list ( u -- )  : list ( u -- ) \ block
     \ calling block again and again looks inefficient but is necessary      \ calling block again and again looks inefficient but is necessary
     \ in a multitasking environment      \ in a multitasking environment
     dup scr !      dup scr !
Line 162  User scr 0 scr ! Line 173  User scr 0 scr !
   
 ' (source) IS source  ' (source) IS source
   
 : load ( i*x n -- j*x )  : load ( i*x n -- j*x ) \ block
   push-file    push-file
   dup loadline ! blk ! >in off ['] interpret catch    dup loadline ! blk ! >in off ['] interpret catch
   pop-file throw ;    pop-file throw ;
   
 : thru ( i*x n1 n2 -- j*x )  : thru ( i*x n1 n2 -- j*x ) \ block
   1+ swap ?DO  I load  LOOP ;    1+ swap ?DO  I load  LOOP ;
   
 : +load ( i*x n -- j*x )  blk @ + load ;  : +load ( i*x n -- j*x ) \ block
       blk @ + load ;
   
 : +thru ( i*x n1 n2 -- j*x )  : +thru ( i*x n1 n2 -- j*x ) \ block
   1+ swap ?DO  I +load  LOOP ;    1+ swap ?DO  I +load  LOOP ;
   
 : --> ( -- )  refill drop ; immediate  : --> ( -- ) \ block- block
       \G If this symbol is encountered whilst loading block @var{n},
       \G discard the remainder of the block and load block @var{n+1}. Used
       \G for chaining multiple blocks together as a single loadable unit.
       refill drop ; immediate
   
 : block-included ( addr u -- )  : block-included ( addr u -- ) \ gforth
     block-fid @ >r block-fid off open-blocks      block-fid @ >r block-fid off open-blocks
     1 load block-fid @ close-file throw flush      1 load block-fid @ close-file throw flush
     r> block-fid ! ;      r> block-fid ! ;
Line 192  true constant block Line 208  true constant block
 true constant block-ext  true constant block-ext
 set-current  set-current
   
 : bye  ['] flush catch drop bye ;  : bye ( -- ) \ tools-ext
     \G Return control to the host operating system (if any).
     ['] flush catch drop bye ;

Removed from v.1.19  
changed lines
  Added in v.1.22


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