mirror of
https://github.com/forth-ev/VolksForth.git
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188 lines
12 KiB
Plaintext
188 lines
12 KiB
Plaintext
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0 \ ks 11 mai 88
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1 Dieses File enth<74>lt Definitionen, die zum Laden der weiteren
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2 System- und Applikationsfiles ben<65>tigt werden.
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3
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4 Unter anderem finden sich hier auch MS-DOS spezifische
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5 Befehle wie zum Beispiel das Allokieren von Speicher-
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6 platz ausserhalb des auf 64k begrenzten Forthsystems
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7 und einige Routinen, die das Arbeiten mit dem Video-
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8 Display erleichtern sowie einige Operatoren zur String-
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9 manipulation.
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0 \ loadscreen for often used words ks cas 25sep16
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1
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2 Onlyforth \needs Assembler 2 loadfrom asm.fb
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3
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4 ' save-buffers Alias sav
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5
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6 ' name &12 + Constant 'name
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7
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8 ' page Alias cls
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9
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10 1 8 +thru .( Systemerweiterung geladen) cr
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0 \ Postkernel words ks 22 dez 87
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1
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2 : blank ( addr quan -- ) bl fill ;
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3
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4 Code stash ( u1 u2 -- u1 u1 u2 )
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5 S W mov W ) push Next end-code
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6 \ : stash ( u1 u2 -- u1 u1 u2 ) over swap ;
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7
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8 : >expect ( addr len -- ) stash expect span @ over place ;
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9
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10 : .field ( addr len quan -- )
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11 over - >r type r> 0 max spaces ;
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12
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13 : tab ( n -- ) col - 0 max spaces ;
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14
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15
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0 \ postkernel ks 08 m<>r 89
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1 \ hier sollte END-CODE eigentlich aehem, also z.B. -TRANSIENT
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2
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3 \needs end-code : end-code toss also ;
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4
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5 : u? ( addr -- ) @ u. ;
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6
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7 : adr ' >body state @ 0=exit [compile] Literal ; immediate
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8
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9 : Abort( ( f -- ) IF [compile] .( true abort" !" THEN
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10 [compile] ( ;
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11
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12 : arguments ( n -- )
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13 depth 1- > Error" zu wenige Parameter" ;
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15
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0 \ MS-DOS memory management
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1
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2 Code lallocate ( pages -- seg ff / rest err# )
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3 R push D R mov $48 # A+ mov $21 int CS
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4 ?[ A D xchg A pop R push A R xchg
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5 ][ R pop A push 0 # D mov ]? Next end-code
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6
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7 Code lfree ( seg -- err# )
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8 E: push D E: mov $49 # A+ mov $21 int CS
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9 ?[ A D xchg ][ 0 # D mov ]? E: pop Next end-code
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0 \ postkernel ks 03 aug 87
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1
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2 c/row c/col * 2* Constant c/dis \ characters per display
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3
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4 Code video@ ( -- seg ) D push R D mov $F # A+ mov
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5 $10 int R D xchg 0 # D- mov 7 # A- cmp
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6 0= ?[ $B0 # D+ mov ][ $B8 # D+ add ]? Next
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7 end-code
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8
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9 : savevideo ( -- seg / ff )
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10 [ c/dis b/seg /mod swap 0<> - ] Literal lallocate
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11 IF drop false exit THEN video@ 0 2 pick 0 c/dis lmove ;
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12
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13 : restorevideo ( seg -- ) ?dup 0=exit
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14 dup 0 video@ 0 c/dis lmove lfree drop ;
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0 \ string operators append attach ks 21 jun 87
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1
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2 | : .stringoverflow true Abort" String zu lang" ;
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3
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4 Code append ( char addr -- )
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5 D W mov D pop W ) A- mov 1 # A- add CS
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6 ?[ ;c: .stringoverflow ; Assembler ]?
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7 A- W ) mov 0 # A+ mov A W add
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8 D- W ) mov D pop Next end-code
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9
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10 Code attach ( addr len addr1 -- ) D W mov C pop
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11 I D mov I pop W ) A- mov A- A+ mov C- A+ add CS
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12 ?[ ;c: .stringoverflow ; Assembler ]?
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13 A+ W ) mov A+ A+ xor A+ C+ mov A W add W inc
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14 rep byte movs D I mov D pop Next end-code
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0 \\ string operators append attach detract ks 21 jun 87
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1
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2 : append ( char addr -- )
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3 under count + c! dup c@ 1+ swap c! ;
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4
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5 : attach ( addr len addr.to -- )
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6 >r under r@ count + swap move r@ c@ + r> c! ;
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7
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8 : detract ( addr -- char )
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9 dup c@ 1- dup 0> and over c!
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10 count >r dup count -rot swap r> cmove ;
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0 \ ?" string operator ks 09 feb 88
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1
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2 \ : (?" ( 8b -- index ) "lit under count rot
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3 \ scan IF swap - exit THEN 2drop false ;
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4
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5 | Create months ," janfebm<62>raprmaijunjulaugsepoktnovdez"
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6
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7 : >months ( n -- addr len ) 3 * 2- months + 3 ;
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8
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9 | Code (?" ( 8b -- index )
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10 A D xchg I ) C- mov 0 # C+ mov C I add
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11 I W mov I inc std 0<>rep byte scas cld
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12 0= ?[ C inc ]? C D mov Next
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13 end-code
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14
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15 : ?" compile (?" ," align ; immediate restrict
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0 \ Conditional compilation ks 12 dez 88
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1 | Defer cond
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2
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3 : .THEN ; immediate
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5 : .ELSE ( -- ) 0
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6 BEGIN name nullstring? IF drop exit THEN
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7 find IF cond -1 case? ?exit ELSE drop THEN
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8 REPEAT ; immediate
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9
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10 : .IF ( f -- ) ?exit [compile] .ELSE ; immediate
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11
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12 | : (cond ( n cfa -- n' )
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13 ['] .THEN case? IF 1- exit THEN
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14 ['] .ELSE case? IF dup 0= + exit THEN
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15 ['] .IF = 0=exit 1+ ; ' (cond is cond
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