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TREEDIRS.PAS
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Pascal/Delphi Source File
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1986-03-15
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4KB
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159 lines
{ Turbo Pascal routines for tree-structured directories }
{ Copyright 1984 Michael A. Covington }
{ Requires MS-DOS or PC-DOS 2.0 or higher, except as noted. }
{ All the routines require these type definitions. }
{ However, except as noted, they do not require each other. }
type pathtype = string[63];
drivetype = string[2];
rtype = record
ax,bx,cx,dx,bp,si,di,ds,es,flags: integer
end;
procedure xxdiskerr(x:drivetype);
begin
writeln('Error -- Invalid disk drive, ''',x,'''');
halt
end;
procedure xxpatherr(x:pathtype);
begin
writeln('Error -- Invalid path, ''',x,'''');
halt
end;
function currentdrive: drivetype;
{ Returns designator for current default drive, e.g., 'A:'. }
{ Works under DOS version 1. }
var w: drivetype;
reg: rtype;
begin
reg.ax:=$1900;
intr($21,reg);
w:='A:';
w[1]:=chr(ord(w[1])+lo(reg.ax));
currentdrive:=w
end;
procedure chdrive(x:drivetype);
{ Chooses a new default drive. }
{ Parameter can have the form 'A:', 'A', 'a:', or 'a'. }
{ Works under DOS version 1. Requires XXDISKERR, above. }
var reg: rtype;
begin
reg.ax := $0E00;
reg.dx := ord(upcase(x[1])) - ord('A');
intr($21,reg);
if (reg.dx < 0) or (lo(reg.ax) < lo(reg.dx)) then xxdiskerr(x);
end;
function diskspace(x:drivetype): real;
{ Returns number of bytes available on specified disk. }
{ Parameter as for CHDRIVE. Requires XXDISKERR, above. }
var reg: rtype;
begin
reg.ax := $3600;
reg.dx := 1 + ord(upcase(x[1])) - ord('A');
intr($21,reg);
if reg.ax = $FFFF then
xxdiskerr(x)
else
diskspace := (256.0*hi(reg.dx)+lo(reg.dx)) * reg.ax * reg.cx
end;
function currentdir(x:drivetype): pathtype;
{ Returns full path to active directory on specified drive, }
{ including backslash at beginning, not including drive }
{ designator. Parameter as for CHDRIVE. }
{ Requires XXDISKERR, above. }
var w: pathtype;
reg: rtype;
i: integer;
begin
{ Get current path }
reg.ax:=$4700;
reg.dx:=1 + ord(upcase(x[1])) - ord('A');
reg.ds:=seg(w[1]);
reg.si:=ofs(w[1]);
intr($21,reg);
if (reg.flags and 1) > 0 then xxdiskerr(x);
{ Turn it into a Turbo string }
i:=1;
while w[i]<>chr(0) do i:=i+1;
w[0]:=chr(i-1);
for i:=1 to length(w) do w[i]:=upcase(w[i]);
currentdir := '\' + w
end;
procedure xxdir(x:pathtype; k:integer);
{ Executes CHDIR, MKDIR, and RMDIR requests. }
{ Requires XXPATHERR and CURRENTDRIVE, above. }
var w: pathtype;
reg: rtype;
begin
w := x + chr(0);
if w[2] <> ':' then { add drive designator }
w := currentdrive + w;
reg.ax := k;
reg.ds := seg(w[1]);
reg.dx := ofs(w[1]);
intr($21,reg);
if (reg.flags and 1) > 0 then xxpatherr(x)
end;
procedure chdir(x:pathtype);
{ Equivalent to CHDIR command in DOS. }
{ Requires XXDIR, XXPATHERR, and CURRENTDRIVE, above. }
{ Caution! Do not leave a directory }
{ if you have files in it open. }
begin
xxdir(x,$3B00)
end;
procedure rmdir(x:pathtype);
{ Equivalent to RMDIR command in DOS. }
{ Requires XXDIR, XXPATHERR, and CURRENTDRIVE, above. }
begin
xxdir(x,$3A00)
end;
procedure mkdir(x:pathtype);
{ Equivalent to MKDIR command in DOS. }
{ Requires XXDIR, XXPATHERR, and CURRENTDRIVE, above. }
begin
xxdir(x,$3900)
end;
procedure rename(x,y:pathtype);
{ Renames a file; unlike the DOS RENAME command, }
{ both parameters of this command are full paths. }
{ The paths need not be the same, allowing a file }
{ to be moved from one directory to another. }
{ First parameter can specify a drive; any drive }
{ letter on the second parameter is ignored. }
var wx,wy: pathtype;
reg: rtype;
begin
wx := x + chr(0);
wy := y + chr(0);
if wx[2]<>':' then wx := currentdrive + wx;
reg.ax := $5600;
reg.ds := seg(wx[1]);
reg.dx := ofs(wx[1]);
reg.es := seg(wy[1]);
reg.di := ofs(wy[1]);
intr($21,reg);
if (reg.flags and 1) <> 0 then
begin
writeln('Error -- Invalid rename request');
writeln(' -- From: ''',x,'''');
writeln(' -- To: ''',y,'''');
halt
end
end;