[gforth] / gforth / blocks.fs  

gforth: gforth/blocks.fs

Diff for /gforth/blocks.fs between version 1.20 and 1.21

version 1.20, Sun Dec 13 23:29:58 1998 UTC version 1.21, Wed Feb 3 00:10:19 1999 UTC
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     block-fid @ ;      block-fid @ ;
   
 : block-position ( u -- ) \ block  : block-position ( u -- ) \ block
     \G positions the block file to the start of block u      \G Position the block file to the start of block u.
     1- chars/block chars um* get-block-fid reposition-file throw ;      1- chars/block chars um* get-block-fid reposition-file throw ;
   
 : update ( -- ) \ block  : update ( -- ) \ block
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 : get-buffer ( n -- a-addr ) \ gforth  : 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  : block ( u -- a-addr ) \ block- block
     \G u identifies a block number. Assign a block buffer to u,
     \G make it the current block buffer and return its start
     \G address, 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 @ <>
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     \ 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 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 ) \ gforth  : updated?  ( n -- f ) \ gforth
     scr @ buffer      scr @ buffer
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   1+ swap ?DO  I +load  LOOP ;    1+ swap ?DO  I +load  LOOP ;
   
 : --> ( -- ) \ block- block  : --> ( -- ) \ 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      refill drop ; immediate
   
 : block-included ( addr u -- ) \ gforth  : block-included ( addr u -- ) \ gforth
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 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 ;

Generate output suitable for use with a patch program
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  Added in v.1.21
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