mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-12-01 19:49:57 +00:00
188 lines
12 KiB
Forth
188 lines
12 KiB
Forth
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\ *** Block No. 0 Hexblock 0
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\ ks 11 mai 88
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Dieses File enth<EFBFBD>lt Definitionen, die zum Laden der weiteren
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System- und Applikationsfiles ben<EFBFBD>tigt werden.
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Unter anderem finden sich hier auch MS-DOS spezifische
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Befehle wie zum Beispiel das Allokieren von Speicher-
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platz ausserhalb des auf 64k begrenzten Forthsystems
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und einige Routinen, die das Arbeiten mit dem Video-
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Display erleichtern sowie einige Operatoren zur String-
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manipulation.
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\ *** Block No. 1 Hexblock 1
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\ loadscreen for often used words ks cas 25sep16
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Onlyforth \needs Assembler 2 loadfrom asm.fb
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' save-buffers Alias sav
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' name &12 + Constant 'name
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' page Alias cls
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1 8 +thru .( Systemerweiterung geladen) cr
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\ *** Block No. 2 Hexblock 2
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\ Postkernel words ks 22 dez 87
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: blank ( addr quan -- ) bl fill ;
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Code stash ( u1 u2 -- u1 u1 u2 )
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S W mov W ) push Next end-code
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\ : stash ( u1 u2 -- u1 u1 u2 ) over swap ;
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: >expect ( addr len -- ) stash expect span @ over place ;
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: .field ( addr len quan -- )
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over - >r type r> 0 max spaces ;
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: tab ( n -- ) col - 0 max spaces ;
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\ *** Block No. 3 Hexblock 3
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\ postkernel ks 08 m<>r 89
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\ hier sollte END-CODE eigentlich aehem, also z.B. -TRANSIENT
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\needs end-code : end-code toss also ;
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: u? ( addr -- ) @ u. ;
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: adr ' >body state @ 0=exit [compile] Literal ; immediate
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: Abort( ( f -- ) IF [compile] .( true abort" !" THEN
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[compile] ( ;
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: arguments ( n -- )
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depth 1- > Error" zu wenige Parameter" ;
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\ *** Block No. 4 Hexblock 4
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\ MS-DOS memory management
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Code lallocate ( pages -- seg ff / rest err# )
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R push D R mov $48 # A+ mov $21 int CS
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?[ A D xchg A pop R push A R xchg
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][ R pop A push 0 # D mov ]? Next end-code
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Code lfree ( seg -- err# )
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E: push D E: mov $49 # A+ mov $21 int CS
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?[ A D xchg ][ 0 # D mov ]? E: pop Next end-code
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\ *** Block No. 5 Hexblock 5
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\ postkernel ks 03 aug 87
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c/row c/col * 2* Constant c/dis \ characters per display
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Code video@ ( -- seg ) D push R D mov $F # A+ mov
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$10 int R D xchg 0 # D- mov 7 # A- cmp
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0= ?[ $B0 # D+ mov ][ $B8 # D+ add ]? Next
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end-code
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: savevideo ( -- seg / ff )
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[ c/dis b/seg /mod swap 0<> - ] Literal lallocate
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IF drop false exit THEN video@ 0 2 pick 0 c/dis lmove ;
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: restorevideo ( seg -- ) ?dup 0=exit
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dup 0 video@ 0 c/dis lmove lfree drop ;
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\ *** Block No. 6 Hexblock 6
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\ string operators append attach ks 21 jun 87
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| : .stringoverflow true Abort" String zu lang" ;
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Code append ( char addr -- )
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D W mov D pop W ) A- mov 1 # A- add CS
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?[ ;c: .stringoverflow ; Assembler ]?
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A- W ) mov 0 # A+ mov A W add
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D- W ) mov D pop Next end-code
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Code attach ( addr len addr1 -- ) D W mov C pop
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I D mov I pop W ) A- mov A- A+ mov C- A+ add CS
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?[ ;c: .stringoverflow ; Assembler ]?
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A+ W ) mov A+ A+ xor A+ C+ mov A W add W inc
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rep byte movs D I mov D pop Next end-code
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\ *** Block No. 7 Hexblock 7
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\\ string operators append attach detract ks 21 jun 87
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: append ( char addr -- )
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under count + c! dup c@ 1+ swap c! ;
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: attach ( addr len addr.to -- )
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>r under r@ count + swap move r@ c@ + r> c! ;
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: detract ( addr -- char )
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dup c@ 1- dup 0> and over c!
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count >r dup count -rot swap r> cmove ;
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\ *** Block No. 8 Hexblock 8
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\ ?" string operator ks 09 feb 88
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\ : (?" ( 8b -- index ) "lit under count rot
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\ scan IF swap - exit THEN 2drop false ;
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| Create months ," janfebm<EFBFBD>raprmaijunjulaugsepoktnovdez"
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: >months ( n -- addr len ) 3 * 2- months + 3 ;
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| Code (?" ( 8b -- index )
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A D xchg I ) C- mov 0 # C+ mov C I add
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I W mov I inc std 0<>rep byte scas cld
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0= ?[ C inc ]? C D mov Next
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end-code
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: ?" compile (?" ," align ; immediate restrict
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\ *** Block No. 9 Hexblock 9
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\ Conditional compilation ks 12 dez 88
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| Defer cond
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: .THEN ; immediate
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: .ELSE ( -- ) 0
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BEGIN name nullstring? IF drop exit THEN
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find IF cond -1 case? ?exit ELSE drop THEN
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REPEAT ; immediate
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: .IF ( f -- ) ?exit [compile] .ELSE ; immediate
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| : (cond ( n cfa -- n' )
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['] .THEN case? IF 1- exit THEN
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['] .ELSE case? IF dup 0= + exit THEN
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['] .IF = 0=exit 1+ ; ' (cond is cond
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\ *** Block No. 10 Hexblock A
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