{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Carl Eric Codere
member of the Free Pascal development team
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.
**********************************************************************}
{$define ATARI}
unit system;
{--------------------------------------------------------------------}
{ LEFT TO DO: }
{--------------------------------------------------------------------}
{ o SBrk }
{ o Implement truncate }
{ o Implement paramstr(0) }
{--------------------------------------------------------------------}
{$I os.inc}
interface
{$I systemh.inc}
type
THandle = longint;
{$I heaph.inc}
{Platform specific information}
const
LineEnding = #10;
LFNSupport = true;
CtrlZMarksEOF: boolean = false; (* #26 not considered as end of file *)
DirectorySeparator = '/';
DriveSeparator = ':';
PathSeparator = ';';
FileNameCaseSensitive = false;
maxExitCode = 255;
MaxPathLen = 255;
sLineBreak: string [1] = LineEnding;
{ used for single computations }
const BIAS4 = $7f-1;
const
UnusedHandle = $ffff;
StdInputHandle = 0;
StdOutputHandle = 1;
StdErrorHandle = $ffff;
implementation
{$I system.inc}
{$I lowmath.inc}
function GetProcessID:SizeUInt;
begin
{$WARNING To be checked by platform maintainer}
GetProcessID := 1;
end;
const
argc : longint = 0;
var
errno : integer;
{$S-}
procedure Stack_Check; assembler;
{ Check for local variable allocation }
{ On Entry -> d0 : size of local stack we are trying to allocate }
asm
XDEF STACKCHECK
move.l sp,d1 { get value of stack pointer }
sub.l d0,d1 { sp - stack_size }
sub.l #2048,d1
cmp.l __BREAK,d1
bgt @st1nosweat
move.l #202,d0
jsr HALT_ERROR
@st1nosweat:
end;
Procedure Error2InOut;
Begin
if (errno <= -2) and (errno >= -11) then
InOutRes:=150-errno { 150+errno }
else
Begin
case errno of
-32 : InOutRes:=1;
-33 : InOutRes:=2;
-34 : InOutRes:=3;
-35 : InOutRes:=4;
-36 : InOutRes:=5;
-37 : InOutRes:=8;
-39 : InOutRes:=8;
-40 : InOutRes:=9;
-46 : InOutRes:=15;
-67..-64 : InOutRes:=153;
-15 : InOutRes:=151;
-13 : InOutRes:=150;
else
InOutres := word(errno);
end;
end;
errno:=0;
end;
procedure halt(errnum : byte);
begin
do_exit;
flush(stderr);
asm
clr.l d0
move.b errnum,d0
move.w d0,-(sp)
move.w #$4c,-(sp)
trap #1
end;
end;
function args : pointer; assembler;
asm
move.l __ARGS,d0
end;
Function GetParamCount(const p: pchar): longint;
var
i: word;
count: word;
Begin
i:=0;
count:=0;
while p[count] <> #0 do
Begin
if (p[count] <> ' ') and (p[count] <> #9) and (p[count] <> #0) then
Begin
i:=i+1;
while (p[count] <> ' ') and (p[count] <> #9) and (p[count] <> #0) do
count:=count+1;
end;
if p[count] = #0 then break;
count:=count+1;
end;
GetParamCount:=longint(i);
end;
Function GetParam(index: word; const p : pchar): string;
{ On Entry: index = string index to correct parameter }
{ On exit: = correct character index into pchar array }
{ Returns correct index to command line argument }
var
count: word;
localindex: word;
l: byte;
temp: string;
Begin
temp:='';
count := 0;
{ first index is one }
localindex := 1;
l:=0;
While p[count] <> #0 do
Begin
if (p[count] <> ' ') and (p[count] <> #9) then
Begin
if localindex = index then
Begin
while (p[count] <> #0) and (p[count] <> ' ') and (p[count] <> #9) and (l < 256) do
Begin
temp:=temp+p[count];
l:=l+1;
count:=count+1;
end;
temp[0]:=char(l);
GetParam:=temp;
exit;
end;
{ Point to next argument in list }
while (p[count] <> #0) and (p[count] <> ' ') and (p[count] <> #9) do
Begin
count:=count+1;
end;
localindex:=localindex+1;
end;
if p[count] = #0 then break;
count:=count+1;
end;
GetParam:=temp;
end;
function paramstr(l : longint) : string;
var
p : pchar;
s1 : string;
begin
if l = 0 then
Begin
s1 := '';
end
else
if (l>0) and (l<=paramcount) then
begin
p:=args;
paramstr:=GetParam(word(l),p);
end
else paramstr:='';
end;
function paramcount : longint;
Begin
paramcount := argc;
end;
procedure randomize;
var
hl : longint;
begin
asm
movem.l d2/d3/a2/a3, -(sp) { save OS registers }
move.w #17,-(sp)
trap #14 { call xbios - random number }
add.l #2,sp
movem.l (sp)+,d2/d3/a2/a3
move.l d0,hl { result in d0 }
end;
randseed:=hl;
end;
function getheapstart:pointer;assembler;
asm
lea.l HEAP,a0
move.l a0,d0
end;
function getheapsize:longint;assembler;
asm
move.l HEAP_SIZE,d0
end ['D0'];
{ This routine is used to grow the heap. }
{ But here we do a trick, we say that the }
{ heap cannot be regrown! }
function sbrk( size: longint): pointer;
{ on exit nil = if fails. }
Begin
sbrk:=nil;
end;
{$I heap.inc}
{****************************************************************************
Low Level File Routines
****************************************************************************}
procedure AllowSlash(p:pchar);
var
i : longint;
begin
{ allow slash as backslash }
for i:=0 to strlen(p) do
if p[i]='/' then p[i]:='\';
end;
procedure do_close(h : longint);
begin
asm
movem.l d2/d3/a2/a3,-(sp)
move.l h,d0
move.w d0,-(sp)
move.w #$3e,-(sp)
trap #1
add.l #4,sp { restore stack ... }
movem.l (sp)+,d2/d3/a2/a3
end;
end;
procedure do_erase(p : pchar);
begin
AllowSlash(p);
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp) { save regs }
move.l p,-(sp)
move.w #$41,-(sp)
trap #1
add.l #6,sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
tst.w d0
beq @doserend
move.w d0,errno
@doserend:
end;
if errno <> 0 then
Error2InOut;
end;
procedure do_rename(p1,p2 : pchar);
begin
AllowSlash(p1);
AllowSlash(p2);
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.l p1,-(sp)
move.l p2,-(sp)
clr.w -(sp)
move.w #$56,-(sp)
trap #1
lea 12(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
tst.w d0
beq @dosreend
move.w d0,errno { error ... }
@dosreend:
end;
if errno <> 0 then
Error2InOut;
end;
function do_isdevice(handle:word):boolean;
begin
if (handle=stdoutputhandle) or (handle=stdinputhandle) or
(handle=stderrorhandle) then
do_isdevice:=FALSE
else
do_isdevice:=TRUE;
end;
function do_write(h,addr,len : longint) : longint;
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.l addr,-(sp)
move.l len,-(sp)
move.l h,d0
move.w d0,-(sp)
move.w #$40,-(sp)
trap #1
lea 12(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
tst.l d0
bpl @doswrend
move.w d0,errno { error ... }
@doswrend:
move.l d0,@RESULT
end;
if errno <> 0 then
Error2InOut;
end;
function do_read(h,addr,len : longint) : longint;
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.l addr,-(sp)
move.l len,-(sp)
move.l h,d0
move.w d0,-(sp)
move.w #$3f,-(sp)
trap #1
lea 12(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
tst.l d0
bpl @dosrdend
move.w d0,errno { error ... }
@dosrdend:
move.l d0,@Result
end;
if errno <> 0 then
Error2InOut;
end;
function do_filepos(handle : longint) : longint;
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.w #1,-(sp) { seek from current position }
move.l handle,d0
move.w d0,-(sp)
move.l #0,-(sp) { with a seek offset of zero }
move.w #$42,-(sp)
trap #1
lea 10(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
move.l d0,@Result
end;
end;
procedure do_seek(handle,pos : longint);
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.w #0,-(sp) { seek from start of file }
move.l handle,d0
move.w d0,-(sp)
move.l pos,-(sp)
move.w #$42,-(sp)
trap #1
lea 10(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
end;
end;
function do_seekend(handle:longint):longint;
var
t: longint;
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.w #2,-(sp) { seek from end of file }
move.l handle,d0
move.w d0,-(sp)
move.l #0,-(sp) { with an offset of 0 from end }
move.w #$42,-(sp)
trap #1
lea 10(sp),sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
move.l d0,t
end;
do_seekend:=t;
end;
function do_filesize(handle : longint) : longint;
var
aktfilepos : longint;
begin
aktfilepos:=do_filepos(handle);
do_filesize:=do_seekend(handle);
do_seek(handle,aktfilepos);
end;
procedure do_truncate (handle,pos:longint);
begin
do_seek(handle,pos);
{!!!!!!!!!!!!}
end;
procedure do_open(var f;p:pchar;flags:longint);
{
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
i : word;
oflags: longint;
begin
AllowSlash(p);
{ 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;
oflags:=$02; { read/write mode }
{ convert filemode to filerec modes }
case (flags and 3) of
0 : begin
filerec(f).mode:=fminput;
oflags:=$00; { read mode only }
end;
1 : filerec(f).mode:=fmoutput;
2 : filerec(f).mode:=fminout;
end;
if (flags and $1000)<>0 then
begin
filerec(f).mode:=fmoutput;
oflags:=$04; { read/write with create }
end
else
if (flags and $100)<>0 then
begin
filerec(f).mode:=fmoutput;
oflags:=$02; { read/write }
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;
asm
movem.l d2/d3/a2/a3,-(sp) { save used registers }
cmp.l #4,oflags { check if rewrite mode ... }
bne @opencont2
{ rewrite mode - create new file }
move.w #0,-(sp)
move.l p,-(sp)
move.w #$3c,-(sp)
trap #1
add.l #8,sp { restore stack of os call }
bra @end
{ reset - open existing files }
@opencont2:
move.l oflags,d0 { use flag as source ... }
@opencont1:
move.w d0,-(sp)
move.l p,-(sp)
move.w #$3d,-(sp)
trap #1
add.l #8,sp { restore stack of os call }
@end:
movem.l (sp)+,d2/d3/a2/a3
tst.w d0
bpl @opennoerr { if positive return values then ok }
cmp.w #-1,d0 { if handle is -1 CON: }
beq @opennoerr
cmp.w #-2,d0 { if handle is -2 AUX: }
beq @opennoerr
cmp.w #-3,d0 { if handle is -3 PRN: }
beq @opennoerr
move.w d0,errno { otherwise normal error }
@opennoerr:
move.w d0,i { get handle as SIGNED VALUE... }
end;
if errno <> 0 then
Error2InOut;
filerec(f).handle:=i;
if ((flags and $100) <> 0) and
(FileRec (F).Handle <> UnusedHandle) then
do_seekend(filerec(f).handle);
end;
{*****************************************************************************
UnTyped File Handling
*****************************************************************************}
{$i file.inc}
{*****************************************************************************
Typed File Handling
*****************************************************************************}
{$i typefile.inc}
{*****************************************************************************
Text File Handling
*****************************************************************************}
{$i text.inc}
{*****************************************************************************
Directory Handling
*****************************************************************************}
procedure DosDir(func:byte;const s:string);
var
buffer : array[0..255] of char;
c : word;
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
AllowSlash(pchar(@buffer));
c:=word(func);
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
pea buffer
move.w c,-(sp)
trap #1
add.l #6,sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
tst.w d0
beq @dosdirend
move.w d0,errno
@dosdirend:
end;
if errno <> 0 then
Error2InOut;
end;
procedure mkdir(const s : string);[IOCheck];
begin
If InOutRes <> 0 then exit;
DosDir($39,s);
end;
procedure rmdir(const s : string);[IOCheck];
begin
If InOutRes <> 0 then exit;
DosDir($3a,s);
end;
procedure chdir(const s : string);[IOCheck];
begin
If InOutRes <> 0 then exit;
DosDir($3b,s);
end;
function GetDirIO (DriveNr: byte; var Dir: ShortString): word;
[public, alias: 'FPC_GETDIRIO'];
var
temp : array[0..255] of char;
i : longint;
j: byte;
drv: word;
begin
GetDirIO := 0;
drv:=word(drivenr);
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
{ Get dir from drivenr : 0=default, 1=A etc... }
move.w drv,-(sp)
{ put (previously saved) offset in si }
{ move.l temp,-(sp)}
pea temp
{ call attos function 47H : Get dir }
move.w #$47,-(sp)
{ make the call }
trap #1
add.l #8,sp
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
end;
{ conversion to pascal string }
i:=0;
while (temp[i]<>#0) do
begin
if temp[i]='/' then
temp[i]:='\';
dir[i+3]:=temp[i];
inc(i);
end;
dir[2]:=':';
dir[3]:='\';
dir[0]:=char(i+2);
{ upcase the string (FPC Pascal function) }
dir:=upcase(dir);
if drivenr<>0 then { Drive was supplied. We know it }
dir[1]:=chr(65+drivenr-1)
else
begin
asm
move.l d2,d6 { save d2 }
movem.l d3/a2/a3,-(sp)
move.w #$19,-(sp)
trap #1
add.l #2,sp
move.w d0,drv
move.l d6,d2 { restore d2 }
movem.l (sp)+,d3/a2/a3
end;
dir[1]:=chr(byte(drv)+ord('A'));
end;
end;
procedure GetDir (DriveNr: byte; var Dir: ShortString);
begin
InOutRes := GetDirIO (DriveNr, Dir);
end;
{*****************************************************************************
System Dependent Exit code
*****************************************************************************}
Procedure system_exit;
begin
end;
{*****************************************************************************
SystemUnit Initialization
*****************************************************************************}
function CheckInitialStkLen (StkLen: SizeUInt): SizeUInt;
begin
CheckInitialStkLen := StkLen;
end;
begin
StackLength := CheckInitialStkLen (InitialStkLen);
{ Initialize ExitProc }
ExitProc:=Nil;
{ Setup heap }
InitHeap;
{ Setup stdin, stdout and stderr }
OpenStdIO(Input,fmInput,StdInputHandle);
OpenStdIO(Output,fmOutput,StdOutputHandle);
OpenStdIO(StdOut,fmOutput,StdOutputHandle);
OpenStdIO(StdErr,fmOutput,StdErrorHandle);
{ Reset IO Error }
InOutRes:=0;
(* This should be changed to a real value during *)
(* thread driver initialization if appropriate. *)
ThreadID := 1;
errno := 0;
{ Setup command line arguments }
argc:=GetParamCount(args);
InitVariantManager;
{$ifdef HASWIDESTRING}
InitWideStringManager;
{$endif HASWIDESTRING}
end.
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