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fpc/rtl/emx/system.pas

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{
$Id$
****************************************************************************
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2002 by Free Pascal development team
Free Pascal - EMX runtime library
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.
****************************************************************************}
unit {$ifdef VER1_0}sysemx{$else}System{$endif};
interface
{Link the startup code.}
{$ifdef VER1_0}
{$l prt1.oo2}
{$else}
{$l prt1.o}
{$endif}
{$I systemh.inc}
{$I heaph.inc}
{Platform specific information}
type
THandle = Longint;
const
LineEnding = #13#10;
{ LFNSupport is defined separately below!!! }
DirectorySeparator = '\';
DriveSeparator = ':';
PathSeparator = ';';
{ FileNameCaseSensitive is defined separately below!!! }
type Tos=(osDOS,osOS2,osDPMI);
var os_mode:Tos;
first_meg:pointer;
type TByteArray = array [0..$ffff] of byte;
PByteArray = ^TByteArray;
TSysThreadIB = record
TID,
Priority,
Version: cardinal;
MCCount,
MCForceFlag: word;
end;
PSysThreadIB = ^TSysThreadIB;
TThreadInfoBlock = record
PExChain,
Stack,
StackLimit: pointer;
TIB2: PSysThreadIB;
Version,
Ordinal: cardinal;
end;
PThreadInfoBlock = ^TThreadInfoBlock;
PPThreadInfoBlock = ^PThreadInfoBlock;
TProcessInfoBlock = record
PID,
ParentPid,
Handle: cardinal;
Cmd,
Env: PByteArray;
Status,
ProcType: cardinal;
end;
PProcessInfoBlock = ^TProcessInfoBlock;
PPProcessInfoBlock = ^PProcessInfoBlock;
const UnusedHandle=-1;
StdInputHandle=0;
StdOutputHandle=1;
StdErrorHandle=2;
LFNSupport: boolean = true;
FileNameCaseSensitive: boolean = false;
sLineBreak = LineEnding;
DefaultTextLineBreakStyle : TTextLineBreakStyle = tlbsCRLF;
var
{ C-compatible arguments and environment }
argc : longint;external name '_argc';
argv : ppchar;external name '_argv';
envp : ppchar;external name '_environ';
EnvC: cardinal; external name '_envc';
(* Pointer to the block of environment variables - used e.g. in unit Dos. *)
Environment: PChar;
var
(* Type / run mode of the current process: *)
(* 0 .. full screen OS/2 session *)
(* 1 .. DOS session *)
(* 2 .. VIO windowable OS/2 session *)
(* 3 .. Presentation Manager OS/2 session *)
(* 4 .. detached (background) OS/2 process *)
ApplicationType: cardinal;
implementation
{$I system.inc}
var
heap_base: pointer; external name '__heap_base';
heap_brk: pointer; external name '__heap_brk';
heap_end: pointer; external name '__heap_end';
(* Maximum heap size - only used if heap is allocated as continuous block. *)
{$IFDEF CONTHEAP}
BrkLimit: cardinal;
{$ENDIF CONTHEAP}
procedure DosGetInfoBlocks (PATIB: PPThreadInfoBlock;
PAPIB: PPProcessInfoBlock); cdecl;
external 'DOSCALLS' index 312;
function DosLoadModule (ObjName: PChar; ObjLen: cardinal; DLLName: PChar;
var Handle: cardinal): cardinal; cdecl;
external 'DOSCALLS' index 318;
function DosQueryProcAddr (Handle, Ordinal: cardinal; ProcName: PChar;
var Address: pointer): cardinal; cdecl;
external 'DOSCALLS' index 321;
function DosSetRelMaxFH (var ReqCount: longint; var CurMaxFH: cardinal):
cardinal; cdecl;
external 'DOSCALLS' index 382;
function DosSetCurrentDir (Name:PChar): cardinal; cdecl;
external 'DOSCALLS' index 255;
function DosSetDefaultDisk (DiskNum:cardinal): cardinal; cdecl;
external 'DOSCALLS' index 220;
{ This is not real prototype, but is close enough }
{ for us (the 2nd parameter is actually a pointer }
{ to a structure). }
function DosCreateDir (Name: PChar; P: pointer): cardinal; cdecl;
external 'DOSCALLS' index 270;
function DosDeleteDir (Name: PChar): cardinal; cdecl;
external 'DOSCALLS' index 226;
{This is the correct way to call external assembler procedures.}
procedure syscall; external name '___SYSCALL';
{
procedure syscall; external 'EMX' index 2;
procedure emx_init; external 'EMX' index 1;
}
{ converts an OS/2 error code to a TP compatible error }
{ code. Same thing exists under most other supported }
{ systems. }
{ Only call for OS/2 DLL imported routines }
Procedure Errno2InOutRes;
Begin
{ errors 1..18 are the same as in DOS }
case InOutRes of
{ simple offset to convert these error codes }
{ exactly like the error codes in Win32 }
19..31 : InOutRes := InOutRes + 131;
{ gets a bit more complicated ... }
32..33 : InOutRes := 5;
38 : InOutRes := 100;
39 : InOutRes := 101;
112 : InOutRes := 101;
110 : InOutRes := 5;
114 : InOutRes := 6;
290 : InOutRes := 290;
end;
{ all other cases ... we keep the same error code }
end;
{****************************************************************************
Miscellaneous related routines.
****************************************************************************}
{$asmmode intel}
procedure system_exit; assembler;
asm
mov ah, 04ch
mov al, byte ptr exitcode
call syscall
end {['EAX']};
{$ASMMODE ATT}
function paramcount:longint;assembler;
asm
movl argc,%eax
decl %eax
end {['EAX']};
function args:pointer;assembler;
asm
movl argv,%eax
end {['EAX']};
function paramstr(l:longint):string;
var p:^Pchar;
begin
{ There seems to be a problem with EMX for DOS when trying to }
{ access paramstr(0), and to avoid problems between DOS and }
{ OS/2 they have been separated. }
if os_Mode = OsOs2 then
begin
if L = 0 then
begin
GetMem (P, 260);
p[0] := #0; { in case of error, initialize to empty string }
{$ASMMODE INTEL}
asm
mov edx, P
mov ecx, 260
mov eax, 7F33h
call syscall { error handle already with empty string }
end ['eax', 'ecx', 'edx'];
ParamStr := StrPas (PChar (P));
FreeMem (P, 260);
end
else
if (l>0) and (l<=paramcount) then
begin
p:=args;
paramstr:=strpas(p[l]);
end
else paramstr:='';
end
else
begin
p:=args;
paramstr:=strpas(p[l]);
end;
end;
procedure randomize; assembler;
asm
mov ah, 2Ch
call syscall
mov word ptr [randseed], cx
mov word ptr [randseed + 2], dx
end {['eax', 'ecx', 'edx']};
{$ASMMODE ATT}
{****************************************************************************
Heap management releated routines.
****************************************************************************}
{ this function allows to extend the heap by calling
syscall $7f00 resizes the brk area}
function sbrk(size:longint):pointer;
{$IFDEF DUMPGROW}
var
L: longword;
begin
WriteLn ('Trying to grow heap by ', Size, ' to ', HeapSize + Size);
{$IFDEF CONTHEAP}
WriteLn ('BrkLimit is ', BrkLimit);
{$ENDIF CONTHEAP}
asm
movl size,%edx
movw $0x7f00,%ax
call syscall { result directly in EAX }
inc %eax { Result in EAX, -1 = error (has to be transformed to 0) }
jz .LSbrk_End
dec %eax { No error - back to previous value }
.LSbrk_End:
mov %eax,L
end ['eax', 'edx'];
WriteLn ('New heap at ', L);
Sbrk := pointer (L);
end;
{$ELSE DUMPGROW}
assembler;
asm
{$IFDEF REGCALL}
movl %eax,%edx
{$ELSE REGCALL}
movl size,%edx
{$ENDIF REGCALL}
movw $0x7f00,%ax
call syscall
inc %eax { Result in EAX, -1 = error (has to be transformed to 0) }
jz .LSbrk_End
dec %eax { No error - back to previous value }
.LSbrk_End:
end {['eax', 'edx']};
{$ENDIF DUMPGROW}
function getheapstart:pointer;assembler;
asm
movl heap_base,%eax
end {['EAX']};
function getheapsize:longint;assembler;
asm
movl heap_brk,%eax
end {['EAX']};
{$i heap.inc}
{****************************************************************************
Low Level File Routines
****************************************************************************}
procedure allowslash(p:Pchar);
{Allow slash as backslash.}
var i:longint;
begin
for i:=0 to strlen(p) do
if p[i]='/' then p[i]:='\';
end;
procedure do_close(h:longint);
begin
{ Only three standard handles under real OS/2 }
if (h > 4) or
((os_MODE = osOS2) and (h > 2)) then
begin
asm
pushl %ebx
movb $0x3e,%ah
movl h,%ebx
call syscall
jnc .Lnoerror { error code? }
movw %ax, InOutRes { yes, then set InOutRes }
.Lnoerror:
popl %ebx
end ['eax'];
end;
end;
procedure do_erase(p:Pchar);
begin
allowslash(p);
asm
movl P,%edx
movb $0x41,%ah
call syscall
jnc .LERASE1
movw %ax,inoutres
.LERASE1:
end ['eax', 'edx'];
end;
procedure do_rename(p1,p2:Pchar);
begin
allowslash(p1);
allowslash(p2);
asm
movl P1, %edx
movl P2, %edi
movb $0x56,%ah
call syscall
jnc .LRENAME1
movw %ax,inoutres
.LRENAME1:
end ['eax', 'edx', 'edi'];
end;
function do_read(h:longint;addr:pointer;len:longint):longint; assembler;
asm
pushl %ebx
{$IFNDEF REGCALL}
movl len,%ecx
movl addr,%edx
movl %eax,%ebx
{$ELSE REGCALL}
movl h,%ebx
{$ENDIF REGCALL}
movb $0x3f,%ah
call syscall
jnc .LDOSREAD1
movw %ax,inoutres
xorl %eax,%eax
.LDOSREAD1:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
function do_write(h:longint;addr:pointer;len:longint) : longint; assembler;
asm
pushl %ebx
{$IFDEF REGCALL}
movl %eax,%ebx
{$ENDIF REGCALL}
xorl %eax,%eax
cmpl $0,len { 0 bytes to write is undefined behavior }
jz .LDOSWRITE1
{$IFNDEF REGCALL}
movl len,%ecx
movl addr,%edx
movl h,%ebx
{$ENDIF REGCALL}
movb $0x40,%ah
call syscall
jnc .LDOSWRITE1
movw %ax,inoutres
.LDOSWRITE1:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
function do_filepos(handle:longint): longint; assembler;
asm
pushl %ebx
{$IFDEF REGCALL}
movl %eax,%ebx
{$ELSE REGCALL}
movl handle,%ebx
{$ENDIF REGCALL}
movw $0x4201,%ax
xorl %edx,%edx
call syscall
jnc .LDOSFILEPOS
movw %ax,inoutres
xorl %eax,%eax
.LDOSFILEPOS:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
procedure do_seek(handle,pos:longint); assembler;
asm
pushl %ebx
{$IFDEF REGCALL}
movl %eax,%ebx
{$ELSE REGCALL}
movl handle,%ebx
movl pos,%edx
{$ENDIF REGCALL}
movw $0x4200,%ax
call syscall
jnc .LDOSSEEK1
movw %ax,inoutres
.LDOSSEEK1:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
function do_seekend(handle:longint):longint; assembler;
asm
pushl %ebx
{$IFDEF REGCALL}
movl %eax,%ebx
{$ELSE REGCALL}
movl handle,%ebx
{$ENDIF REGCALL}
movw $0x4202,%ax
xorl %edx,%edx
call syscall
jnc .Lset_at_end1
movw %ax,inoutres;
xorl %eax,%eax
.Lset_at_end1:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
function do_filesize(handle:longint):longint;
var aktfilepos:longint;
begin
aktfilepos:=do_filepos(handle);
do_filesize:=do_seekend(handle);
do_seek(handle,aktfilepos);
end;
procedure do_truncate(handle,pos:longint); assembler;
asm
pushl %ebx
(* DOS function 40h isn't safe for this according to EMX documentation *)
{$IFDEF REGCALL}
movl %eax,%ebx
pushl %eax
{$ELSE REGCALL}
movl Handle,%ebx
movl Pos,%edx
{$ENDIF REGCALL}
movl $0x7F25,%eax
call syscall
incl %eax
movl %ecx, %eax
{$IFDEF REGCALL}
popl %ebx
{$ENDIF REGCALL}
jnz .LTruncate1 { compare the value of EAX to verify error }
(* File position is undefined after truncation, move to the end. *)
movl $0x4202,%eax
{$IFNDEF REGCALL}
movl Handle,%ebx
{$ENDIF REGCALL}
movl $0,%edx
call syscall
jnc .LTruncate2
.LTruncate1:
movw %ax,inoutres
.LTruncate2:
popl %ebx
end {['eax', 'ebx', 'ecx', 'edx']};
const
FileHandleCount: cardinal = 20;
function Increase_File_Handle_Count: boolean;
var Err: word;
L1: longint;
L2: cardinal;
begin
if os_mode = osOS2 then
begin
L1 := 10;
if DosSetRelMaxFH (L1, L2) <> 0 then
Increase_File_Handle_Count := false
else
if L2 > FileHandleCount then
begin
FileHandleCount := L2;
Increase_File_Handle_Count := true;
end
else
Increase_File_Handle_Count := false;
end
else
begin
Inc (FileHandleCount, 10);
Err := 0;
asm
pushl %ebx
movl $0x6700, %eax
movl FileHandleCount, %ebx
call syscall
jnc .LIncFHandles
movw %ax, Err
.LIncFHandles:
popl %ebx
end ['eax'];
if Err <> 0 then
begin
Increase_File_Handle_Count := false;
Dec (FileHandleCount, 10);
end
else
Increase_File_Handle_Count := true;
end;
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 Action: cardinal;
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;
Action := 0;
{ 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;
if (flags and $1000)<>0 then
Action := $50000; (* Create / replace *)
{ empty name is special }
if p[0]=#0 then
begin
case FileRec(f).mode of
fminput :
FileRec(f).Handle:=StdInputHandle;
fminout, { this is set by rewrite }
fmoutput :
FileRec(f).Handle:=StdOutputHandle;
fmappend :
begin
FileRec(f).Handle:=StdOutputHandle;
FileRec(f).mode:=fmoutput; {fool fmappend}
end;
end;
exit;
end;
Action := Action or (Flags and $FF);
(* DenyNone if sharing not specified. *)
if Flags and 112 = 0 then
Action := Action or 64;
asm
pushl %ebx
movl $0x7f2b, %eax
movl Action, %ecx
movl p, %edx
call syscall
cmpl $0xffffffff, %eax
jnz .LOPEN1
movw %cx, InOutRes
movl UnusedHandle, %eax
.LOPEN1:
movl f,%edx { Warning : This assumes Handle is first }
movl %eax,(%edx) { field of FileRec }
popl %ebx
end ['eax', 'ecx', 'edx'];
if (InOutRes = 4) and Increase_File_Handle_Count then
(* Trying again after increasing amount of file handles *)
asm
pushl %ebx
movl $0x7f2b, %eax
movl Action, %ecx
movl p, %edx
call syscall
cmpl $0xffffffff, %eax
jnz .LOPEN2
movw %cx, InOutRes
movl UnusedHandle, %eax
.LOPEN2:
movl f,%edx
movl %eax,(%edx)
popl %ebx
end ['eax', 'ecx', 'edx'];
{ for systems that have more handles }
if (FileRec (F).Handle <> UnusedHandle) then
begin
if (FileRec (F).Handle > FileHandleCount) then
FileHandleCount := FileRec (F).Handle;
if ((Flags and $100) <> 0) then
begin
do_seekend (FileRec (F).Handle);
FileRec (F).Mode := fmOutput; {fool fmappend}
end;
end;
end;
{$ASMMODE INTEL}
function do_isdevice (Handle: longint): boolean; assembler;
(*
var HT, Attr: longint;
begin
if os_mode = osOS2 then
begin
if DosQueryHType (Handle, HT, Attr) <> 0 then HT := 1;
end
else
*)
asm
push ebx
{$IFDEF REGCALL}
mov ebx, eax
{$ELSE REGCALL}
mov ebx, Handle
{$ENDIF REGCALL}
mov eax, 4400h
call syscall
mov eax, 1
jc @IsDevEnd
test edx, 80h { verify if it is a file }
jnz @IsDevEnd
dec eax { nope, so result is zero }
@IsDevEnd:
pop ebx
end {['eax', 'ebx', 'edx']};
{$ASMMODE ATT}
{*****************************************************************************
UnTyped File Handling
*****************************************************************************}
{$i file.inc}
{*****************************************************************************
Typed File Handling
*****************************************************************************}
{$i typefile.inc}
{*****************************************************************************
Text File Handling
*****************************************************************************}
{$DEFINE EOF_CTRLZ}
{$i text.inc}
{****************************************************************************
Directory related routines.
****************************************************************************}
{*****************************************************************************
Directory Handling
*****************************************************************************}
procedure dosdir(func:byte;const s:string);
var buffer:array[0..255] of char;
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
allowslash(Pchar(@buffer));
asm
leal buffer,%edx
movb func,%ah
call syscall
jnc .LDOS_DIRS1
movw %ax,inoutres
.LDOS_DIRS1:
end ['eax', 'edx'];
end;
procedure MkDir (const S: string);[IOCHECK];
var buffer:array[0..255] of char;
Rc : word;
begin
If (s='') or (InOutRes <> 0) then
exit;
if os_mode = osOs2 then
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
allowslash(Pchar(@buffer));
Rc := DosCreateDir(buffer,nil);
if Rc <> 0 then
begin
InOutRes := Rc;
Errno2Inoutres;
end;
end
else
begin
{ Under EMX 0.9d DOS this routine call may sometimes fail }
{ The syscall documentation indicates clearly that this }
{ routine was NOT tested. }
DosDir ($39, S);
end;
end;
procedure rmdir(const s : string);[IOCHECK];
var buffer:array[0..255] of char;
Rc : word;
begin
if (s = '.' ) then
InOutRes := 16;
If (s='') or (InOutRes <> 0) then
exit;
if os_mode = osOs2 then
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
allowslash(Pchar(@buffer));
Rc := DosDeleteDir(buffer);
if Rc <> 0 then
begin
InOutRes := Rc;
Errno2Inoutres;
end;
end
else
begin
{ Under EMX 0.9d DOS this routine call may sometimes fail }
{ The syscall documentation indicates clearly that this }
{ routine was NOT tested. }
DosDir ($3A, S);
end;
end;
{$ASMMODE INTEL}
procedure ChDir (const S: string);[IOCheck];
var RC: cardinal;
Buffer: array [0..255] of char;
begin
If (s='') or (InOutRes <> 0) then
exit;
(* According to EMX documentation, EMX has only one current directory
for all processes, so we'll use native calls under OS/2. *)
if os_Mode = osOS2 then
begin
if (Length (S) >= 2) and (S [2] = ':') then
begin
RC := DosSetDefaultDisk ((Ord (S [1]) and
not ($20)) - $40);
if RC <> 0 then
InOutRes := RC
else
if Length (S) > 2 then
begin
Move (S [1], Buffer, Length (S));
Buffer [Length (S)] := #0;
AllowSlash (PChar (@Buffer));
RC := DosSetCurrentDir (@Buffer);
if RC <> 0 then
begin
InOutRes := RC;
Errno2InOutRes;
end;
end;
end
else
begin
Move (S [1], Buffer, Length (S));
Buffer [Length (S)] := #0;
AllowSlash (PChar (@Buffer));
RC := DosSetCurrentDir (@Buffer);
if RC <> 0 then
begin
InOutRes:= RC;
Errno2InOutRes;
end;
end;
end
else
if (Length (S) >= 2) and (S [2] = ':') then
begin
asm
mov esi, S
mov al, [esi + 1]
and al, not (20h)
sub al, 41h
mov edx, eax
mov ah, 0Eh
call syscall
mov ah, 19h
call syscall
cmp al, dl
jz @LCHDIR
mov InOutRes, 15
@LCHDIR:
end ['eax','edx','esi'];
if (Length (S) > 2) and (InOutRes <> 0) then
{ Under EMX 0.9d DOS this routine may sometime }
{ fail or crash the system. }
DosDir ($3B, S);
end
else
{ Under EMX 0.9d DOS this routine may sometime }
{ fail or crash the system. }
DosDir ($3B, S);
end;
{$ASMMODE ATT}
procedure GetDir (DriveNr: byte; var Dir: ShortString);
{Written by Michael Van Canneyt.}
var sof:Pchar;
i:byte;
begin
Dir [4] := #0;
{ Used in case the specified drive isn't available }
sof:=pchar(@dir[4]);
{ dir[1..3] will contain '[drivenr]:\', but is not }
{ supplied by DOS, so we let dos string start at }
{ dir[4] }
{ Get dir from drivenr : 0=default, 1=A etc... }
asm
movb drivenr,%dl
movl sof,%esi
mov $0x47,%ah
call syscall
jnc .LGetDir
movw %ax, InOutRes
.LGetDir:
end [ 'eax','edx','esi'];
{ Now Dir should be filled with directory in ASCIIZ, }
{ starting from dir[4] }
dir[0]:=#3;
dir[2]:=':';
dir[3]:='\';
i:=4;
{Conversion to Pascal string }
while (dir[i]<>#0) do
begin
{ convert path name to DOS }
if dir[i]='/' then
dir[i]:='\';
dir[0]:=char(i);
inc(i);
end;
{ upcase the string (FPC function) }
if drivenr<>0 then { Drive was supplied. We know it }
dir[1]:=chr(64+drivenr)
else
begin
{ We need to get the current drive from DOS function 19H }
{ because the drive was the default, which can be unknown }
asm
movb $0x19,%ah
call syscall
addb $65,%al
movb %al,i
end ['eax'];
dir[1]:=char(i);
end;
if not (FileNameCaseSensitive) then dir:=upcase(dir);
end;
{*****************************************************************************
System unit initialization.
****************************************************************************}
{****************************************************************************
Error Message writing using messageboxes
****************************************************************************}
type
TWinMessageBox = function (Parent, Owner: cardinal;
BoxText, BoxTitle: PChar; Identity, Style: cardinal): cardinal; cdecl;
TWinInitialize = function (Options: cardinal): cardinal; cdecl;
TWinCreateMsgQueue = function (Handle: cardinal; cmsg: longint): cardinal;
cdecl;
const
ErrorBufferLength = 1024;
mb_OK = $0000;
mb_Error = $0040;
mb_Moveable = $4000;
MBStyle = mb_OK or mb_Error or mb_Moveable;
WinInitialize: TWinInitialize = nil;
WinCreateMsgQueue: TWinCreateMsgQueue = nil;
WinMessageBox: TWinMessageBox = nil;
EnvSize: cardinal = 0;
var
ErrorBuf: array [0..ErrorBufferLength] of char;
ErrorLen: longint;
PMWinHandle: cardinal;
function ErrorWrite (var F: TextRec): integer;
{
An error message should always end with #13#10#13#10
}
var
P: PChar;
I: longint;
begin
if F.BufPos > 0 then
begin
if F.BufPos + ErrorLen > ErrorBufferLength then
I := ErrorBufferLength - ErrorLen
else
I := F.BufPos;
Move (F.BufPtr^, ErrorBuf [ErrorLen], I);
Inc (ErrorLen, I);
ErrorBuf [ErrorLen] := #0;
end;
if ErrorLen > 3 then
begin
P := @ErrorBuf [ErrorLen];
for I := 1 to 4 do
begin
Dec (P);
if not (P^ in [#10, #13]) then
break;
end;
end;
if ErrorLen = ErrorBufferLength then
I := 4;
if (I = 4) then
begin
WinMessageBox (0, 0, @ErrorBuf, PChar ('Error'), 0, MBStyle);
ErrorLen := 0;
end;
F.BufPos := 0;
ErrorWrite := 0;
end;
function ErrorClose (var F: TextRec): integer;
begin
if ErrorLen > 0 then
begin
WinMessageBox (0, 0, @ErrorBuf, PChar ('Error'), 0, MBStyle);
ErrorLen := 0;
end;
ErrorLen := 0;
ErrorClose := 0;
end;
function ErrorOpen (var F: TextRec): integer;
begin
TextRec(F).InOutFunc := @ErrorWrite;
TextRec(F).FlushFunc := @ErrorWrite;
TextRec(F).CloseFunc := @ErrorClose;
ErrorOpen := 0;
end;
procedure AssignError (var T: Text);
begin
Assign (T, '');
TextRec (T).OpenFunc := @ErrorOpen;
Rewrite (T);
end;
procedure DosEnvInit;
var
Q: PPChar;
I: cardinal;
begin
(* It's a hack, in fact - DOS stores the environment the same way as OS/2 does,
but I don't know how to find Program Segment Prefix and thus the environment
address under EMX, so I'm recreating this structure using EnvP pointer. *)
{$ASMMODE INTEL}
asm
cld
mov ecx, EnvC
mov esi, EnvP
xor eax, eax
xor edx, edx
@L1:
xchg eax, edx
push ecx
mov ecx, -1
mov edi, [esi]
repne
scasb
neg ecx
dec ecx
xchg eax, edx
add eax, ecx
pop ecx
dec ecx
jecxz @Stop
inc esi
inc esi
inc esi
inc esi
jmp @L1
@Stop:
inc eax
mov EnvSize, eax
end ['eax','ecx','edx','esi','edi'];
Environment := GetMem (EnvSize);
asm
cld
mov ecx, EnvC
mov edx, EnvP
mov edi, Environment
@L2:
mov esi, [edx]
@Copying:
lodsb
stosb
or al, al
jnz @Copying
dec ecx
jecxz @Stop2
inc edx
inc edx
inc edx
inc edx
jmp @L2
@Stop2:
stosb
end ['eax','ecx','edx','esi','edi'];
end;
procedure SysInitStdIO;
begin
{ Setup stdin, stdout and stderr, for GUI apps redirect stderr,stdout to be
displayed in a messagebox }
(*
StdInputHandle := longint(GetStdHandle(cardinal(STD_INPUT_HANDLE)));
StdOutputHandle := longint(GetStdHandle(cardinal(STD_OUTPUT_HANDLE)));
StdErrorHandle := longint(GetStdHandle(cardinal(STD_ERROR_HANDLE)));
if not IsConsole then
begin
if (DosLoadModule (nil, 0, 'PMWIN', PMWinHandle) = 0) and
(DosQueryProcAddr (PMWinHandle, 789, nil, pointer (WinMessageBox)) = 0)
and
(DosQueryProcAddr (PMWinHandle, 763, nil, pointer (WinInitialize)) = 0)
and
(DosQueryProcAddr (PMWinHandle, 716, nil, pointer (WinCreateMsgQueue))
= 0)
then
begin
WinInitialize (0);
WinCreateMsgQueue (0, 0);
end
else
HandleError (2);
AssignError (StdErr);
AssignError (StdOut);
Assign (Output, '');
Assign (Input, '');
end
else
begin
*)
OpenStdIO (Input, fmInput, StdInputHandle);
OpenStdIO (Output, fmOutput, StdOutputHandle);
OpenStdIO (StdOut, fmOutput, StdOutputHandle);
OpenStdIO (StdErr, fmOutput, StdErrorHandle);
(*
end;
*)
end;
function GetFileHandleCount: longint;
var L1: longint;
L2: cardinal;
begin
L1 := 0; (* Don't change the amount, just check. *)
if DosSetRelMaxFH (L1, L2) <> 0 then GetFileHandleCount := 50
else GetFileHandleCount := L2;
end;
var TIB: PThreadInfoBlock;
PIB: PProcessInfoBlock;
const
FatalHeap: array [0..33] of char = 'FATAL: Cannot initialize heap!!'#13#10'$';
begin
IsLibrary := FALSE;
{Determine the operating system we are running on.}
{$ASMMODE INTEL}
asm
push ebx
mov os_mode, 0
mov eax, 7F0Ah
call syscall
test bx, 512 {Bit 9 is OS/2 flag.}
setne byte ptr os_mode
test bx, 4096
jz @noRSX
mov os_mode, 2
@noRSX:
{Enable the brk area by initializing it with the initial heap size.}
mov eax, 7F01h
mov edx, heap_brk
add edx, heap_base
call syscall
cmp eax, -1
jnz @heapok
lea edx, FatalHeap
mov eax, 900h
call syscall
pop ebx
push dword 204
call HandleError
@heapok:
{$IFDEF CONTHEAP}
{ Find out brk limit }
mov eax, 7F02h
mov ecx, 3
call syscall
jcxz @heaplimitknown
mov eax, 0
@heaplimitknown:
mov BrkLimit, eax
{$ELSE CONTHEAP}
{ Change sbrk behaviour to allocate arbitrary (non-contiguous) memory blocks }
mov eax, 7F0Fh
mov ecx, 0Ch
mov edx, 8
call syscall
{$ENDIF CONTHEAP}
pop ebx
end ['eax', 'ecx', 'edx'];
{ in OS/2 this will always be nil, but in DOS mode }
{ this can be changed. }
first_meg := nil;
{Now request, if we are running under DOS,
read-access to the first meg. of memory.}
if os_mode in [osDOS,osDPMI] then
asm
push ebx
mov eax, 7F13h
xor ebx, ebx
mov ecx, 0FFFh
xor edx, edx
call syscall
jc @endmem
mov first_meg, eax
@endmem:
pop ebx
end ['eax', 'ecx', 'edx']
else
begin
(* Initialize the amount of file handles *)
FileHandleCount := GetFileHandleCount;
end;
{At 0.9.2, case for enumeration does not work.}
case os_mode of
osDOS:
begin
stackbottom:=pointer(heap_brk); {In DOS mode, heap_brk is
also the stack bottom.}
ApplicationType := 1; (* Running under DOS. *)
IsConsole := true;
ProcessID := 1;
ThreadID := 1;
end;
osOS2:
begin
DosGetInfoBlocks (@TIB, @PIB);
StackBottom := pointer (TIB^.Stack);
Environment := pointer (PIB^.Env);
ApplicationType := PIB^.ProcType;
ProcessID := PIB^.PID;
ThreadID := TIB^.TIB2^.TID;
IsConsole := ApplicationType <> 3;
end;
osDPMI:
begin
stackbottom:=nil; {Not sure how to get it, but seems to be
always zero.}
ApplicationType := 1; (* Running under DOS. *)
IsConsole := true;
ProcessID := 1;
ThreadID := 1;
end;
end;
exitproc:=nil;
{Initialize the heap.}
initheap;
{ ... and exceptions }
SysInitExceptions;
{ ... and I/O }
SysInitStdIO;
{ no I/O-Error }
inoutres:=0;
{$ifdef HASVARIANT}
initvariantmanager;
{$endif HASVARIANT}
if os_Mode in [osDOS,osDPMI] then
DosEnvInit;
{$IFDEF DUMPGROW}
{$IFDEF CONTHEAP}
WriteLn ('Initial brk size is ', GetHeapSize);
WriteLn ('Brk limit is ', BrkLimit);
{$ENDIF CONTHEAP}
{$ENDIF DUMPGROW}
end.
{
$Log$
Revision 1.24 2004-04-22 21:10:56 peter
* do_read/do_write addr argument changed to pointer
Revision 1.23 2004/01/20 23:05:31 hajny
* ExecuteProcess fixes, ProcessID and ThreadID added
Revision 1.22 2003/12/26 22:20:44 hajny
* regcall fixes
Revision 1.21 2003/12/17 22:52:39 hajny
* fix for stackbottom change to pointer
Revision 1.20 2003/11/06 23:21:51 hajny
* cardinal2pointer changes
Revision 1.19 2003/11/01 19:25:50 hajny
* fix of previous mistyping
Revision 1.18 2003/10/25 22:45:37 hajny
* file handling related fixes
Revision 1.17 2003/10/19 12:13:41 hajny
* UnusedHandle value made the same as with other targets
Revision 1.16 2003/10/19 09:35:28 hajny
* fixes from OS/2 merged to EMX
Revision 1.15 2003/10/16 15:43:13 peter
* THandle is platform dependent
Revision 1.14 2003/10/12 18:07:30 hajny
* wrong use of Intel syntax
Revision 1.13 2003/10/12 17:59:40 hajny
* wrong use of Intel syntax
Revision 1.12 2003/10/12 17:52:28 hajny
* wrong use of Intel syntax
Revision 1.11 2003/10/12 10:45:36 hajny
* sbrk error handling corrected
Revision 1.10 2003/10/07 21:33:24 hajny
* stdcall fixes and asm routines cleanup
Revision 1.9 2003/10/04 17:53:08 hajny
* stdcall changes merged to EMX
Revision 1.8 2003/09/29 18:39:59 hajny
* append fix applied to GO32v2, OS/2 and EMX
Revision 1.7 2003/09/27 11:52:35 peter
* sbrk returns pointer
Revision 1.6 2003/09/24 11:13:09 yuri
* Cosmetic changes
* Slightly improved emx.pas
Revision 1.5 2003/06/26 17:12:29 yuri
* pmbidi added
* some cosmetic changes
Revision 1.4 2003/03/23 23:11:17 hajny
+ emx target added
Revision 1.3 2002/12/15 22:46:29 hajny
* First_Meg fixed + Environment initialization under Dos
Revision 1.2 2002/11/17 22:32:05 hajny
* type corrections (longing x cardinal)
Revision 1.1 2002/11/17 16:22:54 hajny
+ RTL for emx target
}
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