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+ implemented file routines do_open and do_close for msdos, based on the go32v2 code
git-svn-id: branches/i8086@24076 -
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nickysn
parent
bbcd3506b3
commit
a463c1f558
@ -13,12 +13,44 @@
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**********************************************************************}
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{ Keep Track of open files }
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const
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max_files = 50;
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var
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openfiles : array [0..max_files-1] of boolean;
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{$ifdef SYSTEMDEBUG}
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opennames : array [0..max_files-1] of pchar;
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const
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free_closed_names : boolean = true;
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{$endif SYSTEMDEBUG}
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{****************************************************************************
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Low level File Routines
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****************************************************************************}
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procedure do_close(handle : thandle);
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var
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regs : Registers;
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begin
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if Handle<=4 then
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exit;
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regs.BX:=handle;
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if handle<max_files then
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begin
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openfiles[handle]:=false;
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{$ifdef SYSTEMDEBUG}
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if assigned(opennames[handle]) and free_closed_names then
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begin
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sysfreememsize(opennames[handle],strlen(opennames[handle])+1);
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opennames[handle]:=nil;
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end;
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{$endif SYSTEMDEBUG}
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end;
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regs.AX:=$3e00;
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MsDos(regs);
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if (regs.Flags and fCarry) <> 0 then
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GetInOutRes(regs.AX);
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end;
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@ -96,8 +128,163 @@ procedure do_truncate (handle:thandle;pos:longint);
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begin
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end;
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procedure do_open(var f;p:pchar;flags:longint);
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const
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FileHandleCount : word = 20;
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function Increase_file_handle_count : boolean;
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var
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regs : Registers;
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begin
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Inc(FileHandleCount,10);
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regs.BX:=FileHandleCount;
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regs.AX:=$6700;
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MsDos(regs);
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if (regs.Flags and fCarry) <> 0 then
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begin
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Increase_file_handle_count:=false;
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Dec (FileHandleCount, 10);
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end
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else
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Increase_file_handle_count:=true;
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end;
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procedure do_open(var f;p:pchar;flags:longint);
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{
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filerec and textrec have both handle and mode as the first items so
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they could use the same routine for opening/creating.
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when (flags and $100) the file will be append
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when (flags and $1000) the file will be truncate/rewritten
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when (flags and $10000) there is no check for close (needed for textfiles)
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}
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var
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regs : Registers;
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action : longint;
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begin
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DoDirSeparators(p);
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{ close first if opened }
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if ((flags and $10000)=0) then
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begin
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case filerec(f).mode of
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fminput,fmoutput,fminout : Do_Close(filerec(f).handle);
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fmclosed : ;
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else
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begin
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inoutres:=102; {not assigned}
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exit;
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end;
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end;
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end;
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{ reset file handle }
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filerec(f).handle:=UnusedHandle;
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action:=$1;
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{ convert filemode to filerec modes }
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case (flags and 3) of
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0 : filerec(f).mode:=fminput;
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1 : filerec(f).mode:=fmoutput;
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2 : filerec(f).mode:=fminout;
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end;
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if (flags and $1000)<>0 then
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action:=$12; {create file function}
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{ empty name is special }
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if p[0]=#0 then
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begin
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case FileRec(f).mode of
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fminput :
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FileRec(f).Handle:=StdInputHandle;
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fminout, { this is set by rewrite }
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fmoutput :
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FileRec(f).Handle:=StdOutputHandle;
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fmappend :
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begin
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FileRec(f).Handle:=StdOutputHandle;
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FileRec(f).mode:=fmoutput; {fool fmappend}
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end;
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end;
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exit;
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end;
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{$ifndef RTLLITE}
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if LFNSupport then
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begin
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regs.AX := $716c; { Use LFN Open/Create API }
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regs.DX := action; { action if file does/doesn't exist }
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regs.SI := Ofs(p^);
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regs.BX := $2000 + (flags and $ff); { file open mode }
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end
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else
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{$endif RTLLITE}
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begin
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if (action and $00f0) <> 0 then
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regs.AX := $3c00 { Map to Create/Replace API }
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else
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regs.AX := $3d00 + (flags and $ff); { Map to Open_Existing API }
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regs.DX := Ofs(p^);
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end;
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regs.DS := Seg(p^);
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regs.CX := $20; { file attributes }
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MsDos(regs);
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{$ifndef RTLLITE}
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if (regs.Flags and fCarry) <> 0 then
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if regs.AX=4 then
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if Increase_file_handle_count then
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begin
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{ Try again }
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if LFNSupport then
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begin
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regs.AX := $716c; {Use LFN Open/Create API}
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regs.DX := action; {action if file does/doesn't exist}
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regs.SI := Ofs(p^);
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regs.BX := $2000 + (flags and $ff); {file open mode}
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end
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else
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begin
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if (action and $00f0) <> 0 then
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regs.AX := $3c00 {Map to Create/Replace API}
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else
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regs.AX := $3d00 + (flags and $ff); {Map to Open API}
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regs.DX := Ofs(p^);
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end;
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regs.DS := Seg(p^);
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regs.CX := $20; {file attributes}
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MsDos(regs);
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end;
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{$endif RTLLITE}
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if (regs.Flags and fCarry) <> 0 then
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begin
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GetInOutRes(regs.AX);
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exit;
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end
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else
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begin
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filerec(f).handle:=regs.AX;
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{$ifndef RTLLITE}
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{ for systems that have more then 20 by default ! }
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if regs.AX>FileHandleCount then
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FileHandleCount:=regs.AX;
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{$endif RTLLITE}
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end;
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if regs.AX<max_files then
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begin
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{$ifdef SYSTEMDEBUG}
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if openfiles[regs.AX] and
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assigned(opennames[regs.AX]) then
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begin
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Writeln(stderr,'file ',opennames[regs.AX],'(',regs.AX,') not closed but handle reused!');
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sysfreememsize(opennames[regs.AX],strlen(opennames[regs.AX])+1);
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end;
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{$endif SYSTEMDEBUG}
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openfiles[regs.AX]:=true;
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{$ifdef SYSTEMDEBUG}
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opennames[regs.AX] := sysgetmem(strlen(p)+1);
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move(p^,opennames[regs.AX]^,strlen(p)+1);
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{$endif SYSTEMDEBUG}
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end;
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{ append mode }
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if ((flags and $100) <> 0) and
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(FileRec (F).Handle <> UnusedHandle) then
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begin
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do_seekend(filerec(f).handle);
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filerec(f).mode:=fmoutput; {fool fmappend}
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end;
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end;
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