version 1.10, 1996/09/30 13:16:07
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version 1.22, 1999/03/23 20:24:16
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\ A less simple implementation of the blocks wordset. |
\ A less simple implementation of the blocks wordset. |
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\ Copyright (C) 1995 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 32
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require struct.fs |
require struct.fs |
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struct |
struct |
1 cells: field buffer-block \ the block number |
cell% field buffer-block \ the block number |
1 cells: field buffer-fid \ the block's fid |
cell% field buffer-fid \ the block's fid |
1 cells: field buffer-dirty \ the block dirty flag |
cell% field buffer-dirty \ the block dirty flag |
chars/block chars: field block-buffer \ the data |
char% chars/block * field block-buffer \ the data |
0 cells: field next-buffer |
cell% 0 * field next-buffer |
end-struct buffer-struct |
end-struct buffer-struct |
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Variable block-buffers |
Variable block-buffers |
Line 46 $20 Value buffers
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Line 46 $20 Value buffers
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User block-fid |
User block-fid |
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: block-cold |
: block-cold ( -- ) |
defers 'cold block-fid off last-block off |
block-fid off last-block off |
buffers buffer-struct drop * allocate throw dup block-buffers ! |
buffer-struct buffers * %alloc dup block-buffers ! ( addr ) |
buffers buffer-struct drop * erase ; |
buffer-struct %size buffers * erase ; |
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' block-cold IS 'cold |
' block-cold INIT8 chained |
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block-cold |
block-cold |
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Defer flush-file |
Defer flush-blocks |
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: use-file ( addr u -- ) \ gforth |
: open-blocks ( addr u -- ) \ gforth |
\g use the file, whose name is given by @var{addr u}, as blocks file |
\g use the file, whose name is given by @var{addr u}, as blocks file |
2dup ['] open-path-file catch 0<> |
2dup open-fpath-file 0<> |
if |
if |
2drop r/w bin create-file throw |
r/w bin create-file throw |
else |
else |
rot close-file throw 2dup file-status throw bin open-file throw |
rot close-file throw 2dup file-status throw bin open-file throw |
>r 2drop r> |
>r 2drop r> |
then |
then |
block-fid @ IF flush-file block-fid @ close-file throw THEN |
block-fid @ IF flush-blocks block-fid @ close-file throw THEN |
block-fid ! ; |
block-fid ! ; |
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: use ( "file" -- ) \ gforth |
: use ( "file" -- ) \ gforth |
\g use @var{file} as blocks file |
\g use @var{file} as blocks file |
name use-file ; |
name open-blocks ; |
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\ 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" use-file |
s" blocks.fb" open-blocks |
then |
then |
block-fid @ ; |
block-fid @ ; |
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: 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 ; |
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: update ( -- ) |
: update ( -- ) \ block |
last-block @ ?dup IF buffer-dirty on THEN ; |
last-block @ ?dup IF buffer-dirty on THEN ; |
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: save-buffer ( buffer -- ) >r |
: save-buffer ( buffer -- ) \ gforth |
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>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-file
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Line 99 Defer flush-file
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endif |
endif |
rdrop ; |
rdrop ; |
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: empty-buffer ( buffer -- ) |
: empty-buffer ( buffer -- ) \ gforth |
buffer-block off ; |
buffer-block off ; |
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: save-buffers ( -- ) block-buffers @ |
: save-buffers ( -- ) \ block |
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block-buffers @ |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
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: empty-buffers ( -- ) block-buffers @ |
: empty-buffers ( -- ) \ block |
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block-buffers @ |
buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; |
buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; |
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: flush ( -- ) |
: flush ( -- ) \ block |
save-buffers |
save-buffers |
empty-buffers ; |
empty-buffers ; |
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' flush IS flush-file |
' flush IS flush-blocks |
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: get-buffer ( n -- a-addr ) |
: get-buffer ( n -- a-addr ) \ gforth |
buffers mod buffer-struct drop * block-buffers @ + ; |
buffers mod buffer-struct %size * block-buffers @ + ; |
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: block ( u -- a-addr ) |
: block ( u -- a-addr ) \ block- block |
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\G @var{u} identifies a block number. Assign a block buffer to @var{u}, |
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\G make it the current block buffer and return its start |
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\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-file
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Line 140 Defer flush-file
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then |
then |
r> dup last-block ! block-buffer ; |
r> dup last-block ! block-buffer ; |
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: 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 ; |
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User scr 0 scr ! |
User scr ( -- a-addr ) \ block-ext |
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\G USER VARIABLE @var{a-addr} is the address of a cell containing |
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\G the block number of the block most recently processed by |
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\G @code{LIST}. |
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0 scr ! |
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: updated? ( n -- f ) scr @ buffer |
: updated? ( n -- f ) \ gforth |
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scr @ buffer |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
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: 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 !
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Line 173 User scr 0 scr !
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' (source) IS source |
' (source) IS source |
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: 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 ; |
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: thru ( i*x n1 n2 -- j*x ) |
: thru ( i*x n1 n2 -- j*x ) \ block |
1+ swap 0 ?DO I load LOOP ; |
1+ swap ?DO I load LOOP ; |
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: +load ( i*x n -- j*x ) blk @ + load ; |
: +load ( i*x n -- j*x ) \ block |
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blk @ + load ; |
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: +thru ( i*x n1 n2 -- j*x ) |
: +thru ( i*x n1 n2 -- j*x ) \ block |
1+ swap 0 ?DO I +load LOOP ; |
1+ swap ?DO I +load LOOP ; |
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: --> ( -- ) \ block- block |
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\G If this symbol is encountered whilst loading block @var{n}, |
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\G discard the remainder of the block and load block @var{n+1}. Used |
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\G for chaining multiple blocks together as a single loadable unit. |
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refill drop ; immediate |
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: --> ( -- ) refill drop ; immediate |
: block-included ( addr u -- ) \ gforth |
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block-fid @ >r block-fid off open-blocks |
: block-included ( addr u -- ) |
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block-fid @ >r block-fid off use-file |
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1 load block-fid @ close-file throw flush |
1 load block-fid @ close-file throw flush |
r> block-fid ! ; |
r> block-fid ! ; |
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: include ( "name" -- ) |
\ thrown out because it may provide unpleasant surprises - anton |
name 2dup dup 3 - /string s" .fb" compare |
\ : include ( "name" -- ) |
0= IF block-included ELSE included THEN ; |
\ name 2dup dup 3 - /string s" .fb" compare |
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\ 0= IF block-included ELSE included THEN ; |
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get-current environment-wordlist set-current |
get-current environment-wordlist set-current |
true constant block |
true constant block |
true constant block-ext |
true constant block-ext |
set-current |
set-current |
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: bye ['] flush catch drop bye ; |
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: bye ( -- ) \ tools-ext |
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\G Return control to the host operating system (if any). |
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['] flush catch drop bye ; |