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AGRAPH2.PAS
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AGRAPH2.PAS
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(*=============================================================================
FMR-50 Graphic common unit for TURBO PASCAL 5.0
By nozi 96/05/19 , 97/02/05
=============================================================================*)
unit agraph2;
{$O-}
Interface
uses crt,DOS;
(*-- system -------------------------------*)
type
byteptr = ^byte;
wordptr = ^word;
pointerUnion= record case pointer of
0:(ofs,seg : word );
1:(p : pointer );
2:(bp : byteptr );
3:(wp : wordptr );
end;
(*-- graphics -----------------------------*)
const
BPLANE = $C000; { VRAM seg }
RPLANE = $C000;
GPLANE = $C000;
IPLANE = $C000;
maxhor = 319;
maxver = 199;
Rmaxhor = 639;
Rmaxver = 399;
maxcol = 15;
MAXCOLOR = 15;
out_of_frame = 255;
aspect_ratio = 1;
HorBytes = 79;
MaxPlane = 3;
VramSeg: array[0..MAXPLANE] of word = (BPLANE, RPLANE, GPLANE, IPLANE);
type
LusterT = array[0..HorBytes] of byte;
VramT = array[0..Rmaxver] of LusterT;
picflnam = string[80];
SmoothType = ( Lgr, Smr, Avg);
dithtype = array[1..4] of integer;
const Dither: array[1..4] of dithtype = (
( 0, 8, 2, 10),
(12, 4, 14, 6),
( 3, 11, 1, 9),
(15, 7, 13, 5));
Dither2: array[1..4] of dithtype = (
(11, 4, 6, 9),
(12, 0, 2, 14),
( 7, 8, 10, 5),
( 3, 15, 13, 1));
{ Dither3: array[1..4] of dithtype = (
( 6, 7, 8, 9),
( 5, 0, 1, 10),
( 4, 3, 2, 11),
(15, 14, 13, 12)); }
Dither3: array[1..4] of dithtype = (
(12, 5, 6, 13),
( 4, 0, 1, 7),
(11, 3, 2, 8),
(15, 10, 9, 14));
var
YPOSTBL : array [0..408] of word;
XPOSTBL : array [0..639] of byte;
XBITTBL : array [0..639] of byte;
vram0 : VramT absolute BPLANE:0;
vram1 : VramT absolute RPLANE:0;
vram2 : VramT absolute GPLANE:0;
vram3 : VramT absolute IPLANE:0;
vram : array[0..MaxPlane] of ^VramT;
vramb : ^vramT;
Stype : smoothtype;
(*-- palette -----------------------------*)
type
mcbT = record
id : char;
owner : word;
parasize: word;
padding : array[0..10]of byte;
end;
RGBT = (RED,GREEN,BLUE);
PaletteAtom = array[RGBT] of byte;
PaletteT = array[0..15] of PaletteAtom;
var
palet : array[0..15,0..2] of byte;
underpalette,palettedata : PaletteT;
const
SystemPalette : PaletteT = (
( 0, 0, 0),( 0, 0,12),( 0,12, 0),( 0,12,12),
(12, 0, 0),(12, 0,12),(12,12, 0),( 7, 7, 7),
(12,12,12),( 0, 0,15),( 0,15, 0),( 0,15,15),
(15, 0, 0),(15, 0,15),(15,15, 0),(15,15,15)
);
(*--EMS-----------------------------------*)
const
EMSvector = $67; {ＥＭＭ割り込みベクトル}
EMSerr = $ff; {ＥＭＳユニット内エラー番号}
var
Emessage, {メッセージ出力フラグ}
EMSterr : boolean; {エラー番号出力フラグ}
EMSerror : byte; {エラー番号格納用}
EMSaddr : pointer; {ページアドレスデータ格納位置}
EMSppage, {物理ページ数}
EMSlpage, {論理ページ数}
EMShandle : word; {使用中のハンドル番号}
(*-- Disk -----------------------------*)
const
SystemDrive = 'A';
UserDrive = 'D';
maxdrive = 'M';
type
flnam = string[80];
text80 = flnam;
filename = string[12];
filelist = array[1..255] of filename;
regtypefl = registers;
var
source,
destination,
asource,
adestination,bmaskz,bmaskp : flnam;
animno,animframe,animofset : integer;
readfileok : boolean;
(*-- Turtle3 -----------------------------*)
const
homex = 160; { maxhor / 2 }
homey = 100; { maxver / 2 }
type
xyz = ( x,y,z );
pos3d = array[ xyz ] of real;
mat3d = array[ xyz,xyz ] of real;
turtle = record
position : pos3d;
heading : mat3d;
pencolor : integer;
pen : boolean;
phase : integer;
end;
var
mama : turtle;
distance : real;
scrunch : boolean;
smooth_trace : boolean;
(*-- forward -----------------------------*)
procedure pset(x,y:integer;color:byte);
function point(x,y:integer):byte;
procedure Line(x1,y1,x2,y2:integer;color:byte);
procedure DITHPLOT (X, Y, Ishade, Color1, Color2: integer);
procedure SmoothPlot(x,y:real; c:integer;
PType:SmoothType);
procedure SmoothLine(x1,y1,x2,y2:real;
color :integer;
PType :SmoothType );
procedure rline(x1,y1,x2,y2:real;color:integer);
procedure Screen_Set;
procedure G_On;
procedure G_Off;
procedure T_On;
procedure T_Off;
procedure cscreen;
procedure gscreen;
procedure gclear( color : integer );
procedure AnalogOn;
procedure AnalogOff;
procedure screenad(access,disp:byte);
procedure screeninit;
function Search_StayPal:pointer;
procedure PaletteSet(palette:PaletteT);
procedure setRGBpalette(color,r,g,b:integer);
procedure getRGBpalette;
procedure getRpalette;
procedure setRpalette;
procedure graypalette;
procedure palette(color : byte; RGB : RGBT; value: byte );
procedure defpalette(color,r,g,b : byte);
procedure defpaletteset(paletteset : palettet);
function HexStr(num:word):string;
function pitago(x,y:real):real;
procedure EMScall(var R : registers); {ＥＭＭファンクションコール}
function Eexist : boolean; {ＥＭＳの存在を調べる}
function EstatOK : boolean; {ＥＭＳのステータスを調べる}
function Ever : byte; {ＥＭＳバージョンの取得}
function Etpage : word; {総ページ数取得}
function Eupage : word; {未使用ページ数取得}
procedure Egetppagedata; {物理ページデータの格納}
function Eppageseg(page : word) : word; {物理ページのセグメント取得}
procedure Egetlpage(page : word); {論理ページの取得}
procedure Eregetlpage(page : word); {論理ページの割り付け変更}
procedure Emapping(phys, logi : word); {マッピング}
procedure Efree; {ＥＭＳの解放}
function Eread(page, offset : word): byte; {データ読み込み}
procedure Ewrite(page,offset:word; data: byte); {データ書き込み}
procedure emsinit;
(*-- Disk -----------------------------*)
function exist(filename : flnam) : boolean;
function existdir(var dir : flnam ): boolean;
procedure partfilename(pathname : flnam; var dir,name,ext : flnam );
function extension(pathname : flnam ) : boolean;
procedure changedrive(drive : byte );
function drives: integer;
procedure select_drive( drv : char );
function current_drive : char;
procedure diskreset;
function fileready( var name : flnam ) : boolean;
procedure wait;
function inkey : char;
procedure inputI( var i: integer );
procedure inputR( var i: real );
procedure beep;
function existsys : boolean;
procedure cursoron ;
procedure cursoroff;
procedure SystemLine(sw:byte);
procedure SORTFILES (var Fnames: filelist; Nfiles: integer);
procedure DISP_NAME (var Fnames: filelist; Fnum, Dispfrst, Fcolor,
Bcolor: integer);
procedure REFRESH_FILES (var Fnames: filelist; Select, Dispfrst,
Displast: integer);
procedure FILE_SELECT (Fmask: text80; var Flnm: text80);
procedure scrntoems( i : integer);
procedure scrn1toems( i : integer);
procedure emstoscrn(i:integer);
procedure emstoscrn1(i:integer);
procedure hscopy(n:integer);
procedure scrn0to1;
procedure scrn1to0;
function loadpal( palettefilename : flnam) : boolean;
function savepal(palettefilename : flnam ): boolean;
function vramsave( name : picflnam ): boolean;
function vramload(name : picflnam ) : boolean;
procedure iffsave(fl : picflnam; sw : integer);
procedure iffload( fl : picflnam);
procedure useiffcolor;
procedure useiffcolor0;
procedure exiffcolor(i:integer); (* i=0 320*200 i=1 640*400 *)
procedure textscreen;
procedure fullscreen;
procedure clear;
procedure penup;
procedure pendown;
procedure setpc( color : integer );
procedure fat;
procedure thin;
procedure turtle_line(x1,y1,x2,y2: real; c: integer);
procedure setdistance( d : real );
procedure draw3d( p1,p2 : pos3d );
procedure fd( st : real );
procedure jp( st : real );
procedure lt( a : real );
procedure rt( a : real );
procedure ut( a : real );
procedure dt( a : real );
procedure spin( a : real );
procedure mirror;
procedure setpos( px,py,pz : real );
procedure setheading( a : real );
procedure home;
procedure clearscreen;
Implementation
(*===========================================================================*)
(* Pset and Pget *)
procedure pset( x,y:integer;color:byte );
var
xpos,daddr,onpattern,offpattern: byte;
begin
if (x >639) or (x < 0) or (y > 399) or (y < 0 ) then exit;
xpos := x shr 3;
daddr := x and 7;
onpattern := $80 shr daddr;
offpattern := not onpattern;
mem[$c000:$ff81] := $1;
if (color and 1)=0
then vram0[ y,xpos ] := vram0[ y,xpos] and offpattern
else vram0[ y,xpos ] := vram0[ y,xpos] or onpattern;
mem[$c000:$ff81] := $42;
if (color and 2)=0
then vram0[ y,xpos ] := vram0[ y,xpos] and offpattern
else vram0[ y,xpos ] := vram0[ y,xpos] or onpattern;
mem[$c000:$ff81] := $84;
if (color and 4)=0
then vram0[ y,xpos ] := vram0[ y,xpos] and offpattern
else vram0[ y,xpos ] := vram0[ y,xpos] or onpattern;
mem[$c000:$ff81] := $c8;
if (color and 8)=0
then vram0[ y,xpos ] := vram0[ y,xpos] and offpattern
else vram0[ y,xpos ] := vram0[ y,xpos] or onpattern;
end;
function point( x,y : integer ) : byte;
var
color : byte;
xpos,xaddr,onpattern : byte;
begin
if (x > 639) or (x < 0) or (y > 399) or (y < 0) then
begin
point := 0;
exit;
end;
xpos := x shr 3;
xaddr := x and 7;
onpattern := $80 shr xaddr;
color := 0;
mem[$c000:$ff81] := $1;
if onpattern and vram0[y,xpos] <> 0 then color := color or 1;
mem[$c000:$ff81] := $42;
if onpattern and vram0[y,xpos] <> 0 then color := color or 2;
mem[$c000:$ff81] := $84;
if onpattern and vram0[y,xpos] <> 0 then color := color or 4;
mem[$c000:$ff81] := $c8;
if onpattern and vram0[y,xpos] <> 0 then color := color or 8;
point := color;
end;
procedure InitTbl;
var i : word;
begin
for i:=0 to 408 do YPOSTBL[i]:=i*80;
for i:=0 to 639 do begin
XPOSTBL[i]:=i shr 3;
XBITTBL[i]:=$80 shr (i and 7);
end;
end;
procedure DITHPLOT (X, Y, Ishade, Color1, Color2: integer);
{ dithered pixel plot command }
var Xmod, Ymod: integer; { X & Y coords modulo 4. This is the place in }
{ the dither matrix }
begin
Xmod := X mod 4 + 1;
Ymod := Y mod 4 + 1;
if (Ishade > Dither[Xmod][Ymod]) then
pset(X, Y, Color1)
else
pset(X, Y, Color2);
end; { procedure DITHPLOT }
procedure Line(x1,y1,x2,y2:integer;color:byte);
var sx,sy,dx,dy,i,s,x,y:integer;
begin
if x2 > x1 then sx := 1
else sx := -1;
if y2 > y1 then sy := 1
else sy := -1;
dx := abs( x2 - x1 );
dy := abs( y2 - y1 );
if dx > dy then
begin
s := dx shr 1;
for i :=0 to dx do
begin
pset(x1,y1,color);
s := s + dy;
if s > dx then
begin
s := s - dx;
y1 := y1 + sy
end;
x1 := x1 + sx
end
end
else
begin
s := dy shr 1;
for i := 0 to dy do
begin
pset(x1,y1,color);
s := s + dx;
if s > dy then
begin
s := s - dy;
x1 := x1 + sx
end;
y1 := y1 + sy
end
end
end;
procedure SmoothPlot(x,y:real; c:integer;PType:SmoothType);
var
xm,ym : real;
xo,yo : integer;
function ftoc( f : real; Color:integer ) : integer;
begin
if f > 0 then
ftoc := round( sqrt( f ) * Color )
else
ftoc := 0
end;
procedure LSPlot( x,y : integer; ratio : real);
var
OldC,NewC : integer;
r : real;
begin
OldC := point(x,y);
case PType of
lgr:begin
NewC := ftoc(ratio,c);
if NewC > OldC then Pset(x,y,NewC);
end;
smr:begin
NewC := ftoc(ratio,Maxcol - c );
if NewC > ( Maxcol - OldC ) then
pset(x,y,maxcol - NewC);
end;
avg:pset(x,y,round(c*ratio+OldC*(1-ratio)));
end;
end;
begin
xo := trunc( x );
yo := trunc( y );
xm := x - xo;
ym := y - yo;
LSPlot(xo ,yo, (1-xm)*(1-ym));
LSPlot(xo+1,yo, xm*(1-ym));
LSPlot(xo, yo+1,(1-xm)*ym);
LSPlot(xo+1,yo+1,xm*ym);
end;
procedure SmoothLine(x1,y1,x2,y2:real;
color :integer;
PType :SmoothType );
var
dx,dy,ix,iy,x,y,sqr1 : real;
points,i : integer;
begin
dx := x2 - x1;
dy := y2 - y1;
if abs( dx ) > abs( dy ) then
points := trunc( abs( dx ) ) + 1
else
points := trunc( abs( dy ) ) + 1;
ix := dx / points;
iy := dy / points;
x := x1;
y := y1;
for i := 0 to points do
begin
smoothplot( x,y,color,PType );
x := x + ix;
y := y + iy
end
end;
procedure RLine( x1,y1,x2,y2: real; color: integer );
begin
line(round(x1),round(y1),round(x2),round(y2),color)
end;
(*===========================================================================*)
(* Graphic Init *)
procedure Screen_Set;
begin
mem[$c000:$ffa0] := $00;
mem[$c000:$ff82] := $67;
mem[$c000:$ff81] := $0f;
end;
procedure G_On;
begin
port[$fda0]:=$0f;
(* Mem[$c000:$ff82]:=$67; *)
end;
procedure G_Off;
begin
port[$fda0]:=$03;
(* Mem[$c000:$ff82]:=$40; *)
end;
procedure T_On;
begin
end;
procedure T_Off;
begin
clrscr;
end;
procedure gclear( color : integer );
var x,y : integer;
begin
for y :=0 to maxver do
for x :=0 to maxhor do
pset(x,y,color)
end;
procedure AnalogOn;
begin
end;
procedure AnalogOff;
begin
end;
procedure screenad(access,disp:byte);
begin
if access = 0
then Mem[$c000:$ff83] := $00
else Mem[$c000:$ff83] := $18;
if Disp = 0
then Mem[$c000:$ff82] := $67
else Mem[$c000:$ff82] := $7f;
end;
procedure cscreen;
begin
T_on;
clrscr;
end;
procedure gscreen;
begin
G_on;
clrscr;
end;
procedure screeninit;
begin
Screen_Set;
AnalogOn;
screenad(0,0);
G_On;
end;
(*===========================================================================*)
(* Palette Set *)
function Search_StayPal:pointer;
begin
Search_StayPal:=nil;
end;
procedure PaletteSet(palette:PaletteT);
var i:integer;
rr,gg,bb,cc:byte;
begin
for i:=0 to 15 do
begin
gg:=palette[i,GREEN] shl 4;
rr:=palette[i, RED] shl 4;
bb:=palette[i, BLUE] shl 4;
cc := i;
port[$fd90] := cc;
port[$fd92] := bb;
port[$fd94] := rr;
port[$fd96] := gg
end;
end;
procedure setRGBpalette( color,r,g,b : integer );
var rr,gg,bb,cc : byte;
begin
cc :=color;
rr :=r;
gg :=g;
bb :=b;
rr :=rr shl 4;
gg :=gg shl 4;
bb :=bb shl 4;
port[$fd90] := cc;
port[$fd92] := bb;
port[$fd94] := rr;
port[$fd96] := gg;
end;
procedure setRpalette;
begin
end;
procedure getRpalette;
begin
end;
procedure getRGBpalette;
var r,g,b,i : byte;
begin
for i := 0 to 15 do
begin
port[$fd90] := i;
b := port[$fd92];
r := port[$fd94];
g := port[$fd96];
r := r shr 4;
g := g shr 4;
b := b shr 4;
palet[i,0] := r;
palet[i,1] := g;
palet[i,2] := b
end;
end;
procedure graypalette;
var
c : integer;
begin
for c := 0 to 15 do
setRGBpalette( c,c,c,c )
end;
procedure palette(color : byte;RGB : RGBT; value: byte );
begin
port[$fd90] := color;
case rgb of
RED : begin
port[$fd94] := value shl 4;
palettedata[color,red] := value;
end;
GREEN : begin
port[$fd96] := value shl 4;
palettedata[color,green] := value;
end;
BLUE : begin
port[$fd92] := value shl 4;
palettedata[color,blue] := value;
end;
end;
end;
procedure defpalette(color,r,g,b : byte);
begin
palette(color,red,r);
palette(color,green,g);
palette(color,blue,b);
end;
procedure defpaletteset(paletteset : palettet);
var
c : integer;
rgb : rgbt;
begin
for c := 0 to maxcolor do
for rgb := red to blue do
palette(c,rgb,paletteset[c,rgb]);
end;
(*===========================================================================*)
(* etc *)
const
hexcode : array[0..15] of char = (
'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
);
function HexStr(num:word):string;
begin
hexstr:='$'+
hexcode[hi(num) shr 4 ]+
hexcode[hi(num) and $f]+
hexcode[lo(num) shr 4 ]+
hexcode[lo(num) and $f] ;
end;
function pitago(x,y:real):real;
begin
x := x*x;
y := y*y;
pitago := sqrt(x+y);
end;
(*===========================================================================*)
(* EMS *)
procedure EMScall(var R : registers);
begin
intr(EMSvector,R);
if (R.ah <> 0) and EMSterr then writeln('EMS error ; no.',R.ah);
EMSerror := R.ah
end;
function Eexist : boolean;
var R : registers;
EMSstr : string[8];
i : byte;
begin
EMSstr := 'EMMXXXX0';
R.ah := $35;
R.al := EMSvector;
intr($21,R);
for i := 1 to 8 do
if mem[R.es : $0009+i] <> ord(EMSstr[i]) then begin
Eexist := false;
if Emessage then writeln('EMMが存在しません.');
exit
end;
Eexist := true
end;
function EstatOK : boolean;
var R : registers;
begin
R.ah := $40;
EMScall(R);
if (R.ah <> $00) and Emessage then writeln('EMSが異常です.');
EstatOK := (R.ah = $00)
end;
function Ever : byte;
var R : registers;
begin
R.ah := $46;
EMScall(R);
Ever := R.al
end;
function Etpage : word;
var R : registers;
begin
R.ah := $42;
EMScall(R);
Etpage := R.dx
end;
function Eupage : word;
var R : registers;
begin
R.ah := $42;
EMScall(R);
Eupage := R.bx
end;
procedure Egetppagedata;
var R : registers;
i : byte;
begin
if Ever = $32 then begin {EMS ver 3.2 の場合}
R.ah := $41;
EMScall(R);
EMSppage := 4;
if memavail < 16 then begin
if Emessage then writeln('EMSデータ用メモリが足りません.');
EMSerror := EMSerr;
exit
end;
getmem(EMSaddr,16);
for i := 0 to 3 do begin
memw[seg(EMSaddr^):ofs(EMSaddr^)+i*4] := R.bx + i*$400;
memw[seg(EMSaddr^):ofs(EMSaddr^)+i*4+2] := i
end
end
else begin {EMS ver 4.0 の場合}
R.ax := $5801;
EMScall(R);
EMSppage := R.cx;
if memavail < EMSppage*4 then begin
if Emessage then writeln('EMSデータ用メモリが足りません.');
EMSerror := EMSerr;
exit
end;
getmem(EMSaddr,EMSppage*4);
R.ax := $5800;
R.es := seg(EMSaddr^);
R.di := ofs(EMSaddr^);
EMScall(R)
end
end;
function Eppageseg(page : word) : word;
begin
Eppageseg := memw[seg(EMSaddr^):ofs(EMSaddr^)+(page-1)*4]
end;
procedure Egetlpage(page : word);
var R : registers;
begin
if Ever = $32 then begin {EMS ver 3.2 の場合}
R.ah := $43;
R.bx := page;
EMScall(R)
end
else begin {EMS ver 4.0 の場合}
R.ax := $5a00;
R.bx := page;
EMScall(R)
end;
if R.ah = 0 then begin
EMSlpage := page;
EMShandle := R.dx;
if Emessage then writeln('ＥＭＳを',page,'ページ使用します.')
end
else begin
if Emessage then writeln('EMSが不足しました.');
exit
end
end;
procedure Eregetlpage(page : word);
var R : registers;
begin
if Ever = $32 then begin
if Emessage then writeln('EMS 3.2では割り当て変更はできません.');
EMSerror := EMSerr;
exit
end;
R.ah := $51;
R.dx := EMShandle;
R.bx := page;
EMScall(R);
if R.ah = 0 then begin
EMSlpage := page;
if Emessage then writeln('ＥＭＳを',page,'ページに変更します.')
end
else if Emessage and (R.ah <> $83) then writeln('EMSが不足しました,')
end;
procedure Emapping(phys, logi : word);
var R : registers;
begin
R.ah := $44;
R.al := (phys-1) mod $100;
R.bx := logi-1;
R.dx := EMShandle;
EMScall(R)
end;
procedure Efree;
var R : registers;
begin
freemem(EMSaddr,EMSppage*4);
if EMShandle <> 0 then begin
R.ah := $45;
R.dx := EMShandle;
EMScall(R);
if EMSerror = 0 then begin
EMSppage := 0;
EMSlpage := 0;
EMShandle := 0;
if Emessage then writeln('ＥＭＳを解放しました.')
end
end
end;
function Eread(page, offset : word) : byte;
begin
Eread := mem[Eppageseg(page):offset]
end;
procedure Ewrite(page, offset : word; data : byte);
begin
if (page > EMSppage) or (page = 0) or (offset >= $4000) then begin
EMSerror := EMSerr;
exit
end;
mem[Eppageseg(page):offset] := data;
EMSerror := 0
end;
procedure emsinit;
type str4 = string[4];
var i,j : word;
l : byte;
function hexchar(num : word) : str4;
var i, j : byte;
tmp : str4;
begin
tmp := '';
for i := 1 to 4 do begin
j := num mod $10;
if j <= 9 then tmp := chr(ord('0')+j) + tmp
else tmp := chr(ord('A')+j-9) + tmp;
num := num div $10
end;
hexchar := tmp
end;
begin
if not Eexist then halt;
if not EstatOK then halt;
writeln('ＥＭＳの総ページ 数は ',Etpage,' ページです.');
writeln('ＥＭＳの未使用ページ数は ',Eupage,' ページです.');
writeln;
writeln('物理ページデータは、以下のとおりです.');
Egetppagedata;
if EMSerror <> 0 then halt;
for i := 1 to EMSppage do
writeln('page ',i,' : Segment ',hexchar(Eppageseg(i)));
Egetlpage(Eupage-20);
end;
(* ====================================================================== *)
(* Disk *)
function exist(filename : flnam) : boolean;
var
fil : file;
begin
{$I-}
assign(fil,filename);
reset(fil);
close(fil);
{$I+}
exist :=( ioresult = 0 );
end;
function existdir(var dir : flnam ): boolean;
var
temppath : flnam;
begin
getdir(0,temppath);
{$i-}
chdir( dir );
{$i+}
existdir := (ioresult = 0);
chdir(temppath);
end;
procedure partfilename(pathname : flnam; var dir,name,ext : flnam );
var
l,p,nameptr,extptr : integer;
begin
l := length( pathname );
nameptr := 1;
for p := 1 to l do
if pathname[p] = '\'
then nameptr := p + 1;
dir := copy(pathname, 1, nameptr - 1 );
extptr := l + 1;
for p := nameptr to l do
if pathname[p] = '.' then
extptr := p;
name := copy(pathname, nameptr, extptr - nameptr );
ext := copy(pathname, extptr + 1, 3 );
end;
function extension(pathname : flnam ) : boolean;
var
dir,name,ext : flnam;
begin
partfilename( pathname, dir, name, ext );
extension := not( ext = '' );
end;
procedure changedrive(drive : byte );
var
directory : flnam;
begin
getdir( drive,directory );
chdir( directory );
end;
function drives: integer;
var
r : regtypefl;
begin
r.ax := $0E00;
r.dx := $00FF;
msdos(r);
drives := r.ax and $FF;
end;