29 lines
847 B
Forth
29 lines
847 B
Forth
The related ilo & napia virtual machines make use of blocks
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for data storage. This implements a set of words for interacting
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with the blocks from within RetroForth/Nga.
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The exposed word set is compact:
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block:set-file (s-)
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block:read (na-)
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block:write (na-)
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~~~
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{{
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'Blocks var
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'BlockFile var
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:open (n-) @BlockFile swap file:open !Blocks ;
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:close (-) @Blocks file:close ;
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:seek (n-) #4096 n:mul @Blocks file:seek ;
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:read (-n) #4 [ @Blocks file:read ] times pack ;
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:store (an-a) swap store-next ;
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:write (n-) unpack 'abcd 'bcda reorder #4 [ @Blocks file:write ] times ;
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---reveal---
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:block:set-file (s-) s:keep !BlockFile ;
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:block:read (na-)
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file:R open swap seek #1024 [ read store ] times drop close ;
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:block:write (na-)
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file:R+ open swap seek #1024 [ fetch-next write ] times drop close ;
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}}
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~~~
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