mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-11-26 17:49:18 +00:00
69 lines
4.2 KiB
Forth
69 lines
4.2 KiB
Forth
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\ *** Block No. 0 Hexblock 0
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\\ Simple Files 11Nov86
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Wenn volksFORTH im Direktzugriff Disketten bearbeitet, ist es
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trotzdem wuenschenswert eine Art File-Struktur zu besitzen.
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Dieses File enthaelt eine einfache Implementation eines
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Filesystems. Der/die Programmierer/in muss selbst die Direktory
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auf dem laufenden halten: in ihr sind die Start-Bloecke des
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entsprechenden Diskettenteils gespeichert.
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Sogar eine Hierarchie von Direktories laesst sich so relisieren.
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Vorgestellt wurde dieses FileSystem von Georg Rehfeld und auch
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von ihm fuer volksFORTH implementiert (ultraFORTH auf dem C64).
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\ *** Block No. 1 Hexblock 1
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\ simple files 12feb86
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\needs search .( search missing) \\
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| Variable (dir : dir (dir @ ; : root 0 (dir ! ; root
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| : read" ( -- n)
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Ascii " word count dup >r dir block b/blk search
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0= abort" not found" r> + >in push >in !
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bl dir block b/blk (word number drop ;
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: load" read" dir + load ; : dir" read" (dir +! ;
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: list" read" dir + list ;
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\ 1 +load \ Only if file" is needed
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\ *** Block No. 2 Hexblock 2
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\ simple files 01feb86
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| : snap ( n0 -- n1) $20 / 3 max $20 * ;
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: file" ( n --)
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Ascii " word count 2dup dir block b/blk search
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IF + nip
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ELSE drop dir block b/blk -trailing nip snap $20 +
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dup b/blk 1- > abort" directory full"
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2dup + >r dir block + swap cmove r>
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THEN snap $18 + >r
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dir - extend under dabs <# # # # #
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base @ $0A = IF Ascii & ELSE Ascii $ THEN hold
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rot 0< IF Ascii - ELSE bl THEN hold #>
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r> dir block + swap cmove update ;
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\ *** Block No. 3 Hexblock 3
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\ dir load" 11feb86
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\needs search .( search missing) \\
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0 Constant dir
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: load" ( -- )
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Ascii " word count dup >r dir block b/blk search
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0= abort" not found" r> +
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>in @ blk @ rot >in ! dir blk !
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bl word number drop -rot blk ! >in ! load ;
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