mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-11-26 02:49:17 +00:00
69 lines
4.4 KiB
Plaintext
69 lines
4.4 KiB
Plaintext
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0 \\ Simple Files 11Nov86
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1
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2 Wenn volksFORTH im Direktzugriff Disketten bearbeitet, ist es
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3 trotzdem wuenschenswert eine Art File-Struktur zu besitzen.
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4 Dieses File enthaelt eine einfache Implementation eines
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5 Filesystems. Der/die Programmierer/in muss selbst die Direktory
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6 auf dem laufenden halten: in ihr sind die Start-Bloecke des
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7 entsprechenden Diskettenteils gespeichert.
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8 Sogar eine Hierarchie von Direktories laesst sich so relisieren.
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9
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10 Vorgestellt wurde dieses FileSystem von Georg Rehfeld und auch
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11 von ihm fuer volksFORTH implementiert (ultraFORTH auf dem C64).
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0 \ simple files 12feb86
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1
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2 \needs search .( search missing) \\
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3
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4 | Variable (dir : dir (dir @ ; : root 0 (dir ! ; root
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6 | : read" ( -- n)
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7 Ascii " word count dup >r dir block b/blk search
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8 0= abort" not found" r> + >in push >in !
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9 bl dir block b/blk (word number drop ;
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10
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11 : load" read" dir + load ; : dir" read" (dir +! ;
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12 : list" read" dir + list ;
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13
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14 \ 1 +load \ Only if file" is needed
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0 \ simple files 01feb86
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1
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2 | : snap ( n0 -- n1) $20 / 3 max $20 * ;
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3 : file" ( n --)
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4 Ascii " word count 2dup dir block b/blk search
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5 IF + nip
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6 ELSE drop dir block b/blk -trailing nip snap $20 +
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7 dup b/blk 1- > abort" directory full"
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8 2dup + >r dir block + swap cmove r>
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9 THEN snap $18 + >r
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10 dir - extend under dabs <# # # # #
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11 base @ $0A = IF Ascii & ELSE Ascii $ THEN hold
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12 rot 0< IF Ascii - ELSE bl THEN hold #>
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13 r> dir block + swap cmove update ;
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0 \ dir load" 11feb86
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1
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2 \needs search .( search missing) \\
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3
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4 0 Constant dir
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6 : load" ( -- )
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7 Ascii " word count dup >r dir block b/blk search
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8 0= abort" not found" r> +
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9 >in @ blk @ rot >in ! dir blk !
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10 bl word number drop -rot blk ! >in ! load ;
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