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{
This file is part of the Free Pascal run time library.
Copyright (c) 2016 by Free Pascal development team
Low level file functions for Atari TOS
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{****************************************************************************
Low level File Routines
All these functions can set InOutRes on errors
****************************************************************************}
{ close a file from the handle value }
procedure do_close(handle : longint);
var
dosResult: longint;
begin
dosResult:=gemdos_fclose(handle);
if dosResult < 0 then
Error2InOutRes(dosResult);
end;
procedure do_erase(p : pchar; pchangeable: boolean);
var
oldp: pchar;
dosResult: longint;
begin
oldp:=p;
DoDirSeparators(p,pchangeable);
dosResult:=gemdos_fdelete(p);
if dosResult <0 then
Error2InOutRes(dosResult);
if oldp<>p then
FreeMem(p);
end;
procedure do_rename(p1,p2 : pchar; p1changeable, p2changeable: boolean);
var
oldp1, oldp2 : pchar;
dosResult: longint;
begin
oldp1:=p1;
oldp2:=p2;
DoDirSeparators(p1,p1changeable);
DoDirSeparators(p2,p2changeable);
dosResult:=gemdos_frename(0,p1,p2);
if dosResult < 0 then
Error2InOutRes(dosResult);
if oldp1<>p1 then
FreeMem(p1);
if oldp2<>p2 then
FreeMem(p2);
end;
function do_write(h: longint; addr: pointer; len: longint) : longint;
var
dosResult: longint;
begin
do_write:=0;
if (len<=0) or (h=-1) then
exit;
dosResult:=gemdos_fwrite(h, len, addr);
if dosResult < 0 then
begin
Error2InOutRes(dosResult);
end
else
do_write:=dosResult;
end;
function do_read(h: longint; addr: pointer; len: longint) : longint;
var
dosResult: longint;
begin
do_read:=0;
if (len<=0) or (h=-1) then exit;
dosResult:=gemdos_fread(h, len, addr);
if dosResult<0 then
begin
Error2InOutRes(dosResult);
end
else
do_read:=dosResult;
end;
function do_filepos(handle: longint) : longint;
var
dosResult: longint;
begin
do_filepos:=-1;
dosResult:=gemdos_fseek(0, handle, SEEK_FROM_CURRENT);
if dosResult < 0 then
begin
Error2InOutRes(dosResult);
end
else
do_filepos:=dosResult;
end;
procedure do_seek(handle, pos: longint);
var
dosResult: longint;
begin
dosResult:=gemdos_fseek(pos, handle, SEEK_FROM_START);
if dosResult < 0 then
Error2InOutRes(dosResult);
end;
function do_seekend(handle: longint):longint;
var
dosResult: longint;
begin
do_seekend:=-1;
dosResult:=gemdos_fseek(0, handle, SEEK_FROM_END);
if dosResult < 0 then
begin
Error2InOutRes(dosResult);
end
else
do_seekend:=dosResult;
end;
function do_filesize(handle : THandle) : longint;
var
currfilepos: longint;
begin
do_filesize:=-1;
currfilepos:=do_filepos(handle);
if currfilepos >= 0 then
begin
do_filesize:=do_seekend(handle);
end;
do_seek(handle,currfilepos);
end;
{ truncate at a given position }
procedure do_truncate(handle, pos: longint);
begin
{ TODO: }
end;
procedure do_open(var f;p:pchar;flags:longint; pchangeable: boolean);
{
filerec and textrec have both handle and mode as the first items so
they could use the same routine for opening/creating.
when (flags and $100) the file will be append
when (flags and $1000) the file will be truncate/rewritten
when (flags and $10000) there is no check for close (needed for textfiles)
}
var
oldp : pchar;
dosResult: longint;
begin
{ close first if opened }
if ((flags and $10000)=0) then
begin
case filerec(f).mode of
fmInput, fmOutput, fmInout:
do_close(filerec(f).handle);
fmClosed: ;
else
begin
InOutRes:=102; {not assigned}
exit;
end;
end;
end;
{ reset file handle }
filerec(f).handle:=UnusedHandle;
{ convert filemode to filerec modes }
case (flags and 3) of
0 : filerec(f).mode:=fmInput;
1 : filerec(f).mode:=fmOutput;
2 : filerec(f).mode:=fmInout;
end;
{ empty name is special }
if p[0]=#0 then begin
case filerec(f).mode of
fminput :
filerec(f).handle:=StdInputHandle;
fmappend,
fmoutput : begin
filerec(f).handle:=StdOutputHandle;
filerec(f).mode:=fmOutput; {fool fmappend}
end;
end;
exit;
end;
oldp:=p;
DoDirSeparators(p);
{ rewrite (create a new file) }
if (flags and $1000)<>0 then
dosResult:=gemdos_fcreate(p,0)
else
dosResult:=gemdos_fopen(p,flags and 3);
if oldp<>p then
freemem(p);
if dosResult < 0 then
begin
Error2InOutRes(dosResult);
filerec(f).mode:=fmClosed;
exit;
end
else
filerec(f).handle:=word(dosResult);
{ append mode }
if ((Flags and $100)<>0) and
(FileRec(F).Handle<>UnusedHandle) then begin
do_seekend(filerec(f).handle);
filerec(f).mode:=fmOutput; {fool fmappend}
end;
end;
function do_isdevice(handle: thandle): boolean;
begin
if (handle=StdOutputHandle) or (handle=StdInputHandle) or
(handle=StdErrorHandle) then
do_isdevice:=True
else
do_isdevice:=False;
end;
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