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26e15a2e1d
fpc/rtl/go32v2/system.pp
pierre 26e15a2e1d * some typo corrected !
2000-06-05 06:20:44 +00:00

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{
$Id$
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by 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.
**********************************************************************}
unit system;
interface
{ two debug conditionnals can be used
- SYSTEMDEBUG
-for STACK checks
-for non closed files at exit (or at any time with GDB)
- SYSTEM_DEBUG_STARTUP
specifically for
- proxy command line (DJGPP feature)
- list of args
- list of env variables (PM) }
{$ifndef NO_EXCEPTIONS_IN_SYSTEM}
{$define EXCEPTIONS_IN_SYSTEM}
{$endif NO_EXCEPTIONS_IN_SYSTEM}
{ include system-independent routine headers }
{$I systemh.inc}
{ include heap support headers }
{$I heaph.inc}
const
{ Default filehandles }
UnusedHandle = -1;
StdInputHandle = 0;
StdOutputHandle = 1;
StdErrorHandle = 2;
FileNameCaseSensitive : boolean = false;
{ Default memory segments (Tp7 compatibility) }
seg0040 = $0040;
segA000 = $A000;
segB000 = $B000;
segB800 = $B800;
var
{ Mem[] support }
mem : array[0..$7fffffff] of byte absolute $0:$0;
memw : array[0..$7fffffff] of word absolute $0:$0;
meml : array[0..$7fffffff] of longint absolute $0:$0;
{ C-compatible arguments and environment }
argc : longint;
argv : ppchar;
envp : ppchar;
dos_argv0 : pchar;
{$ifndef RTLLITE}
{ System info }
LFNSupport : boolean;
{$endif RTLLITE}
type
{ Dos Extender info }
p_stub_info = ^t_stub_info;
t_stub_info = packed record
magic : array[0..15] of char;
size : longint;
minstack : longint;
memory_handle : longint;
initial_size : longint;
minkeep : word;
ds_selector : word;
ds_segment : word;
psp_selector : word;
cs_selector : word;
env_size : word;
basename : array[0..7] of char;
argv0 : array [0..15] of char;
dpmi_server : array [0..15] of char;
end;
p_go32_info_block = ^t_go32_info_block;
t_go32_info_block = packed record
size_of_this_structure_in_bytes : longint; {offset 0}
linear_address_of_primary_screen : longint; {offset 4}
linear_address_of_secondary_screen : longint; {offset 8}
linear_address_of_transfer_buffer : longint; {offset 12}
size_of_transfer_buffer : longint; {offset 16}
pid : longint; {offset 20}
master_interrupt_controller_base : byte; {offset 24}
slave_interrupt_controller_base : byte; {offset 25}
selector_for_linear_memory : word; {offset 26}
linear_address_of_stub_info_structure : longint; {offset 28}
linear_address_of_original_psp : longint; {offset 32}
run_mode : word; {offset 36}
run_mode_info : word; {offset 38}
end;
var
stub_info : p_stub_info;
go32_info_block : t_go32_info_block;
{$ifdef SYSTEMDEBUG}
const
accept_sbrk : boolean = true;
{$endif}
{
necessary for objects.pas, should be removed (at least from the interface
to the implementation)
}
type
trealregs=record
realedi,realesi,realebp,realres,
realebx,realedx,realecx,realeax : longint;
realflags,
reales,realds,realfs,realgs,
realip,realcs,realsp,realss : word;
end;
function do_write(h,addr,len : longint) : longint;
function do_read(h,addr,len : longint) : longint;
procedure syscopyfromdos(addr : longint; len : longint);
procedure syscopytodos(addr : longint; len : longint);
procedure sysrealintr(intnr : word;var regs : trealregs);
function tb : longint;
implementation
{ include system independent routines }
{$I system.inc}
const
carryflag = 1;
type
tseginfo=packed record
offset : pointer;
segment : word;
end;
var
doscmd : string[128]; { Dos commandline copied from PSP, max is 128 chars }
old_int00 : tseginfo;cvar;
old_int75 : tseginfo;cvar;
{$asmmode ATT}
{*****************************************************************************
Go32 Helpers
*****************************************************************************}
function far_strlen(selector : word;linear_address : longint) : longint;assembler;
asm
movl linear_address,%edx
movl %edx,%ecx
movw selector,%gs
.Larg19:
movb %gs:(%edx),%al
testb %al,%al
je .Larg20
incl %edx
jmp .Larg19
.Larg20:
movl %edx,%eax
subl %ecx,%eax
end;
function tb : longint;
begin
tb:=go32_info_block.linear_address_of_transfer_buffer;
end;
function tb_segment : longint;
begin
tb_segment:=go32_info_block.linear_address_of_transfer_buffer shr 4;
end;
function tb_offset : longint;
begin
tb_offset:=go32_info_block.linear_address_of_transfer_buffer and $f;
end;
function tb_size : longint;
begin
tb_size:=go32_info_block.size_of_transfer_buffer;
end;
function dos_selector : word;
begin
dos_selector:=go32_info_block.selector_for_linear_memory;
end;
function get_ds : word;assembler;
asm
movw %ds,%ax
end;
function get_cs : word;assembler;
asm
movw %cs,%ax
end;
procedure sysseg_move(sseg : word;source : longint;dseg : word;dest : longint;count : longint);
begin
if count=0 then
exit;
if (sseg<>dseg) or ((sseg=dseg) and (source>dest)) then
asm
pushw %es
pushw %ds
cld
movl count,%ecx
movl source,%esi
movl dest,%edi
movw dseg,%ax
movw %ax,%es
movw sseg,%ax
movw %ax,%ds
movl %ecx,%eax
shrl $2,%ecx
rep
movsl
movl %eax,%ecx
andl $3,%ecx
rep
movsb
popw %ds
popw %es
end ['ESI','EDI','ECX','EAX']
else if (source<dest) then
{ copy backward for overlapping }
asm
pushw %es
pushw %ds
std
movl count,%ecx
movl source,%esi
movl dest,%edi
movw dseg,%ax
movw %ax,%es
movw sseg,%ax
movw %ax,%ds
addl %ecx,%esi
addl %ecx,%edi
movl %ecx,%eax
andl $3,%ecx
orl %ecx,%ecx
jz .LSEG_MOVE1
{ calculate esi and edi}
decl %esi
decl %edi
rep
movsb
incl %esi
incl %edi
.LSEG_MOVE1:
subl $4,%esi
subl $4,%edi
movl %eax,%ecx
shrl $2,%ecx
rep
movsl
cld
popw %ds
popw %es
end ['ESI','EDI','ECX'];
end;
var
_args : ppchar;external name '_args';
procedure setup_arguments;
function atohex(s : pchar) : longint;
var
rv : longint;
v : byte;
begin
rv:=0;
while (s^<>#0) do
begin
v:=byte(s^)-byte('0');
if (v > 9) then
dec(v,7);
v:=v and 15; { in case it's lower case }
rv:=(rv shl 4) or v;
inc(longint(s));
end;
atohex:=rv;
end;
type
arrayword = array [0..255] of word;
var
psp : word;
i,j : longint;
quote : char;
proxy_s : string[50];
al,proxy_argc,proxy_seg,proxy_ofs,lin : longint;
largs : array[0..127] of pchar;
rm_argv : ^arrayword;
argv0len : longint;
useproxy : boolean;
hp : ppchar;
begin
fillchar(largs,sizeof(largs),0);
psp:=stub_info^.psp_selector;
largs[0]:=dos_argv0;
argc := 1;
sysseg_move(psp, 128, get_ds, longint(@doscmd), 128);
{$IfDef SYSTEM_DEBUG_STARTUP}
Writeln(stderr,'Dos command line is #',doscmd,'# size = ',length(doscmd));
{$EndIf }
{ setup cmdline variable }
argv0len:=strlen(dos_argv0);
cmdline:=sysgetmem(argv0len+length(doscmd)+1);
move(dos_argv0^,cmdline^,argv0len);
move(doscmd[1],cmdline[argv0len],length(doscmd));
cmdline[argv0len+length(doscmd)]:=#0;
j := 1;
quote := #0;
for i:=1 to length(doscmd) do
Begin
if doscmd[i] = quote then
begin
quote := #0;
if (i>1) and ((doscmd[i-1]='''') or (doscmd[i-1]='"')) then
begin
j := i+1;
doscmd[i] := #0;
continue;
end;
doscmd[i] := #0;
largs[argc]:=@doscmd[j];
inc(argc);
j := i+1;
end
else
if (quote = #0) and ((doscmd[i] = '''') or (doscmd[i]='"')) then
begin
quote := doscmd[i];
j := i + 1;
end else
if (quote = #0) and ((doscmd[i] = ' ')
or (doscmd[i] = #9) or (doscmd[i] = #10) or
(doscmd[i] = #12) or (doscmd[i] = #9)) then
begin
doscmd[i]:=#0;
if j<i then
begin
largs[argc]:=@doscmd[j];
inc(argc);
j := i+1;
end else inc(j);
end else
if (i = length(doscmd)) then
begin
doscmd[i+1]:=#0;
largs[argc]:=@doscmd[j];
inc(argc);
end;
end;
hp:=envp;
useproxy:=false;
while assigned(hp^) do
begin
if (hp^[0]=' ') then
begin
proxy_s:=strpas(hp^);
if Copy(proxy_s,1,7)=' !proxy' then
begin
proxy_s[13]:=#0;
proxy_s[18]:=#0;
proxy_s[23]:=#0;
largs[2]:=@proxy_s[9];
largs[3]:=@proxy_s[14];
largs[4]:=@proxy_s[19];
useproxy:=true;
break;
end;
end;
inc(hp);
end;
if (not useproxy) and
(argc > 1) and (far_strlen(get_ds,longint(largs[1])) = 6) then
begin
move(largs[1]^,proxy_s[1],6);
proxy_s[0] := #6;
if (proxy_s = '!proxy') then
useproxy:=true;
end;
if useproxy then
begin
proxy_argc := atohex(largs[2]);
proxy_seg := atohex(largs[3]);
proxy_ofs := atohex(largs[4]);
{$IfDef SYSTEM_DEBUG_STARTUP}
Writeln(stderr,'proxy command line found');
writeln(stderr,'argc: ',proxy_argc,' seg: ',proxy_seg,' ofs: ',proxy_ofs);
{$EndIf SYSTEM_DEBUG_STARTUP}
if proxy_argc>128 then
proxy_argc:=128;
rm_argv := sysgetmem(proxy_argc*sizeof(word));
sysseg_move(dos_selector,proxy_seg*16+proxy_ofs, get_ds,longint(rm_argv),proxy_argc*sizeof(word));
for i:=0 to proxy_argc - 1 do
begin
lin := proxy_seg*16 + rm_argv^[i];
al :=far_strlen(dos_selector, lin);
largs[i] := sysgetmem(al+1);
sysseg_move(dos_selector, lin, get_ds,longint(largs[i]), al+1);
{$IfDef SYSTEM_DEBUG_STARTUP}
Writeln(stderr,'arg ',i,' #',rm_argv^[i],'#',al,'#',largs[i],'#');
{$EndIf SYSTEM_DEBUG_STARTUP}
end;
sysfreemem(rm_argv);
argc := proxy_argc;
end;
argv := sysgetmem(argc shl 2);
for i := 0 to argc-1 do
argv[i]:=largs[i];
_args:=argv;
end;
function strcopy(dest,source : pchar) : pchar;
begin
asm
cld
movl 12(%ebp),%edi
movl $0xffffffff,%ecx
xorb %al,%al
repne
scasb
not %ecx
movl 8(%ebp),%edi
movl 12(%ebp),%esi
movl %ecx,%eax
shrl $2,%ecx
rep
movsl
movl %eax,%ecx
andl $3,%ecx
rep
movsb
movl 8(%ebp),%eax
leave
ret $8
end;
end;
var
__stubinfo : p_stub_info;external name '__stubinfo';
___dos_argv0 : pchar;external name '___dos_argv0';
procedure setup_environment;
var env_selector : word;
env_count : longint;
dos_env,cp : pchar;
begin
stub_info:=__stubinfo;
dos_env := sysgetmem(stub_info^.env_size);
env_count:=0;
sysseg_move(stub_info^.psp_selector,$2c, get_ds, longint(@env_selector), 2);
sysseg_move(env_selector, 0, get_ds, longint(dos_env), stub_info^.env_size);
cp:=dos_env;
while cp ^ <> #0 do
begin
inc(env_count);
while (cp^ <> #0) do inc(longint(cp)); { skip to NUL }
inc(longint(cp)); { skip to next character }
end;
envp := sysgetmem((env_count+1) * sizeof(pchar));
if (envp = nil) then exit;
cp:=dos_env;
env_count:=0;
while cp^ <> #0 do
begin
envp[env_count] := sysgetmem(strlen(cp)+1);
strcopy(envp[env_count], cp);
{$IfDef SYSTEM_DEBUG_STARTUP}
Writeln(stderr,'env ',env_count,' = "',envp[env_count],'"');
{$EndIf SYSTEM_DEBUG_STARTUP}
inc(env_count);
while (cp^ <> #0) do
inc(longint(cp)); { skip to NUL }
inc(longint(cp)); { skip to next character }
end;
envp[env_count]:=nil;
longint(cp):=longint(cp)+3;
dos_argv0 := sysgetmem(strlen(cp)+1);
if (dos_argv0 = nil) then halt;
strcopy(dos_argv0, cp);
{ update ___dos_argv0 also }
___dos_argv0:=dos_argv0
end;
procedure syscopytodos(addr : longint; len : longint);
begin
if len > tb_size then
HandleError(217);
sysseg_move(get_ds,addr,dos_selector,tb,len);
end;
procedure syscopyfromdos(addr : longint; len : longint);
begin
if len > tb_size then
HandleError(217);
sysseg_move(dos_selector,tb,get_ds,addr,len);
end;
procedure sysrealintr(intnr : word;var regs : trealregs);
begin
regs.realsp:=0;
regs.realss:=0;
asm
movw intnr,%bx
xorl %ecx,%ecx
movl regs,%edi
movw $0x300,%ax
int $0x31
end;
end;
procedure set_pm_interrupt(vector : byte;const intaddr : tseginfo);
begin
asm
movl intaddr,%eax
movl (%eax),%edx
movw 4(%eax),%cx
movl $0x205,%eax
movb vector,%bl
int $0x31
end;
end;
procedure get_pm_interrupt(vector : byte;var intaddr : tseginfo);
begin
asm
movb vector,%bl
movl $0x204,%eax
int $0x31
movl intaddr,%eax
movl %edx,(%eax)
movw %cx,4(%eax)
end;
end;
procedure getinoutres(def : word);
var
regs : trealregs;
begin
regs.realeax:=$5900;
regs.realebx:=$0;
sysrealintr($21,regs);
InOutRes:=lo(regs.realeax);
case InOutRes of
19 : InOutRes:=150;
21 : InOutRes:=152;
end;
if InOutRes=0 then
InOutRes:=Def;
end;
{ Keep Track of open files }
const
max_files = 50;
var
openfiles : array [0..max_files-1] of boolean;
{$ifdef SYSTEMDEBUG}
opennames : array [0..max_files-1] of pchar;
const
free_closed_names : boolean = true;
{$endif SYSTEMDEBUG}
{*****************************************************************************
System Dependent Exit code
*****************************************************************************}
procedure ___exit(exitcode:byte);cdecl;external name '___exit';
procedure do_close(handle : longint);forward;
Procedure system_exit;
var
h : byte;
begin
for h:=0 to max_files-1 do
if openfiles[h] then
begin
{$ifdef SYSTEMDEBUG}
writeln(stderr,'file ',opennames[h],' not closed at exit');
{$endif SYSTEMDEBUG}
if h>=5 then
do_close(h);
end;
{ halt is not allways called !! }
{ not on normal exit !! PM }
set_pm_interrupt($00,old_int00);
{$ifndef EXCEPTIONS_IN_SYSTEM}
set_pm_interrupt($75,old_int75);
{$endif EXCEPTIONS_IN_SYSTEM}
___exit(exitcode);
end;
procedure new_int00;
begin
HandleError(200);
end;
{$ifndef EXCEPTIONS_IN_SYSTEM}
procedure new_int75;
begin
asm
xorl %eax,%eax
outb %al,$0x0f0
movb $0x20,%al
outb %al,$0x0a0
outb %al,$0x020
end;
HandleError(200);
end;
{$endif EXCEPTIONS_IN_SYSTEM}
var
__stkbottom : longint;external name '__stkbottom';
procedure int_stackcheck(stack_size:longint);[public,alias:'FPC_STACKCHECK'];
{
called when trying to get local stack if the compiler directive $S
is set this function must preserve esi !!!! because esi is set by
the calling proc for methods it must preserve all registers !!
With a 2048 byte safe area used to write to StdIo without crossing
the stack boundary
}
begin
asm
pushl %eax
pushl %ebx
movl stack_size,%ebx
addl $2048,%ebx
movl %esp,%eax
subl %ebx,%eax
{$ifdef SYSTEMDEBUG}
movl loweststack,%ebx
cmpl %eax,%ebx
jb .L_is_not_lowest
movl %eax,loweststack
.L_is_not_lowest:
{$endif SYSTEMDEBUG}
movl __stkbottom,%ebx
cmpl %eax,%ebx
jae .L__short_on_stack
popl %ebx
popl %eax
leave
ret $4
.L__short_on_stack:
{ can be usefull for error recovery !! }
popl %ebx
popl %eax
end['EAX','EBX'];
HandleError(202);
end;
{*****************************************************************************
ParamStr/Randomize
*****************************************************************************}
function paramcount : longint;
begin
paramcount := argc - 1;
end;
function paramstr(l : longint) : string;
begin
if (l>=0) and (l+1<=argc) then
paramstr:=strpas(argv[l])
else
paramstr:='';
end;
procedure randomize;
var
hl : longint;
regs : trealregs;
begin
regs.realeax:=$2c00;
sysrealintr($21,regs);
hl:=lo(regs.realedx);
randseed:=hl*$10000+ lo(regs.realecx);
end;
{*****************************************************************************
Heap Management
*****************************************************************************}
var
int_heap : longint;external name 'HEAP';
int_heapsize : longint;external name 'HEAPSIZE';
function getheapstart:pointer;
begin
getheapstart:=@int_heap;
end;
function getheapsize:longint;
begin
getheapsize:=int_heapsize;
end;
function ___sbrk(size:longint):longint;cdecl;external name '___sbrk';
function Sbrk(size : longint):longint;assembler;
asm
{$ifdef SYSTEMDEBUG}
cmpb $1,accept_sbrk
je .Lsbrk
movl $-1,%eax
jmp .Lsbrk_fail
.Lsbrk:
{$endif}
movl size,%eax
pushl %eax
call ___sbrk
addl $4,%esp
{$ifdef SYSTEMDEBUG}
.Lsbrk_fail:
{$endif}
end;
{ include standard heap management }
{$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(handle : longint);
var
regs : trealregs;
begin
if Handle<=4 then
exit;
regs.realebx:=handle;
if handle<max_files then
begin
openfiles[handle]:=false;
{$ifdef SYSTEMDEBUG}
if assigned(opennames[handle]) and free_closed_names then
begin
sysfreememsize(opennames[handle],strlen(opennames[handle])+1);
opennames[handle]:=nil;
end;
{$endif SYSTEMDEBUG}
end;
regs.realeax:=$3e00;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
procedure do_erase(p : pchar);
var
regs : trealregs;
begin
AllowSlash(p);
syscopytodos(longint(p),strlen(p)+1);
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$7141
else
{$endif RTLLITE}
regs.realeax:=$4100;
regs.realesi:=0;
regs.realecx:=0;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
procedure do_rename(p1,p2 : pchar);
var
regs : trealregs;
begin
AllowSlash(p1);
AllowSlash(p2);
if strlen(p1)+strlen(p2)+3>tb_size then
HandleError(217);
sysseg_move(get_ds,longint(p2),dos_selector,tb,strlen(p2)+1);
sysseg_move(get_ds,longint(p1),dos_selector,tb+strlen(p2)+2,strlen(p1)+1);
regs.realedi:=tb_offset;
regs.realedx:=tb_offset + strlen(p2)+2;
regs.realds:=tb_segment;
regs.reales:=tb_segment;
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$7156
else
{$endif RTLLITE}
regs.realeax:=$5600;
regs.realecx:=$ff; { attribute problem here ! }
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
function do_write(h,addr,len : longint) : longint;
var
regs : trealregs;
size,
writesize : longint;
begin
writesize:=0;
while len > 0 do
begin
if len>tb_size then
size:=tb_size
else
size:=len;
syscopytodos(addr+writesize,size);
regs.realecx:=size;
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
regs.realebx:=h;
regs.realeax:=$4000;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
begin
GetInOutRes(lo(regs.realeax));
exit(writesize);
end;
inc(writesize,lo(regs.realeax));
dec(len,lo(regs.realeax));
{ stop when not the specified size is written }
if lo(regs.realeax)<size then
break;
end;
Do_Write:=WriteSize;
end;
function do_read(h,addr,len : longint) : longint;
var
regs : trealregs;
size,
readsize : longint;
begin
readsize:=0;
while len > 0 do
begin
if len>tb_size then
size:=tb_size
else
size:=len;
regs.realecx:=size;
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
regs.realebx:=h;
regs.realeax:=$3f00;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
begin
GetInOutRes(lo(regs.realeax));
do_read:=0;
exit;
end;
syscopyfromdos(addr+readsize,lo(regs.realeax));
inc(readsize,lo(regs.realeax));
dec(len,lo(regs.realeax));
{ stop when not the specified size is read }
if lo(regs.realeax)<size then
break;
end;
do_read:=readsize;
end;
function do_filepos(handle : longint) : longint;
var
regs : trealregs;
begin
regs.realebx:=handle;
regs.realecx:=0;
regs.realedx:=0;
regs.realeax:=$4201;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
Begin
GetInOutRes(lo(regs.realeax));
do_filepos:=0;
end
else
do_filepos:=lo(regs.realedx) shl 16+lo(regs.realeax);
end;
procedure do_seek(handle,pos : longint);
var
regs : trealregs;
begin
regs.realebx:=handle;
regs.realecx:=pos shr 16;
regs.realedx:=pos and $ffff;
regs.realeax:=$4200;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
function do_seekend(handle:longint):longint;
var
regs : trealregs;
begin
regs.realebx:=handle;
regs.realecx:=0;
regs.realedx:=0;
regs.realeax:=$4202;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
Begin
GetInOutRes(lo(regs.realeax));
do_seekend:=0;
end
else
do_seekend:=lo(regs.realedx) shl 16+lo(regs.realeax);
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;
{ truncate at a given position }
procedure do_truncate (handle,pos:longint);
var
regs : trealregs;
begin
do_seek(handle,pos);
regs.realecx:=0;
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
regs.realebx:=handle;
regs.realeax:=$4000;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
{$ifndef RTLLITE}
const
FileHandleCount : longint = 20;
function Increase_file_handle_count : boolean;
var
regs : trealregs;
begin
Inc(FileHandleCount,10);
regs.realebx:=FileHandleCount;
regs.realeax:=$6700;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
begin
Increase_file_handle_count:=false;
Dec (FileHandleCount, 10);
end
else
Increase_file_handle_count:=true;
end;
{$endif not RTLLITE}
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
regs : trealregs;
action : 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;
action:=$1;
{ 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:=$12; {create file function}
{ empty name is special }
if p[0]=#0 then
begin
case FileRec(f).mode of
fminput :
FileRec(f).Handle:=StdInputHandle;
fminout, { this is set by rewrite }
fmoutput :
FileRec(f).Handle:=StdOutputHandle;
fmappend :
begin
FileRec(f).Handle:=StdOutputHandle;
FileRec(f).mode:=fmoutput; {fool fmappend}
end;
end;
exit;
end;
{ real dos call }
syscopytodos(longint(p),strlen(p)+1);
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$716c
else
{$endif RTLLITE}
regs.realeax:=$6c00;
regs.realedx:=action;
regs.realds:=tb_segment;
regs.realesi:=tb_offset;
regs.realebx:=$2000+(flags and $ff);
regs.realecx:=$20;
sysrealintr($21,regs);
{$ifndef RTLLITE}
if (regs.realflags and carryflag) <> 0 then
if lo(regs.realeax)=4 then
if Increase_file_handle_count then
begin
{ Try again }
if LFNSupport then
regs.realeax:=$716c
else
regs.realeax:=$6c00;
regs.realedx:=action;
regs.realds:=tb_segment;
regs.realesi:=tb_offset;
regs.realebx:=$2000+(flags and $ff);
regs.realecx:=$20;
sysrealintr($21,regs);
end;
{$endif RTLLITE}
if (regs.realflags and carryflag) <> 0 then
begin
GetInOutRes(lo(regs.realeax));
exit;
end
else
begin
filerec(f).handle:=lo(regs.realeax);
{$ifndef RTLLITE}
{ for systems that have more then 20 by default ! }
if lo(regs.realeax)>FileHandleCount then
FileHandleCount:=lo(regs.realeax);
{$endif RTLLITE}
end;
if lo(regs.realeax)<max_files then
begin
{$ifdef SYSTEMDEBUG}
if openfiles[lo(regs.realeax)] and
assigned(opennames[lo(regs.realeax)]) then
begin
Writeln(stderr,'file ',opennames[lo(regs.realeax)],'(',lo(regs.realeax),') not closed but handle reused!');
sysfreememsize(opennames[lo(regs.realeax)],strlen(opennames[lo(regs.realeax)])+1);
end;
{$endif SYSTEMDEBUG}
openfiles[lo(regs.realeax)]:=true;
{$ifdef SYSTEMDEBUG}
opennames[lo(regs.realeax)] := sysgetmem(strlen(p)+1);
move(p^,opennames[lo(regs.realeax)]^,strlen(p)+1);
{$endif SYSTEMDEBUG}
end;
{ append mode }
if (flags and $100)<>0 then
begin
do_seekend(filerec(f).handle);
filerec(f).mode:=fmoutput; {fool fmappend}
end;
end;
function do_isdevice(handle:longint):boolean;
var
regs : trealregs;
begin
regs.realebx:=handle;
regs.realeax:=$4400;
sysrealintr($21,regs);
do_isdevice:=(regs.realedx and $80)<>0;
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
end;
{*****************************************************************************
UnTyped File Handling
*****************************************************************************}
{$i file.inc}
{*****************************************************************************
Typed File Handling
*****************************************************************************}
{$i typefile.inc}
{*****************************************************************************
Text File Handling
*****************************************************************************}
{$DEFINE EOF_CTRLZ}
{$i text.inc}
{*****************************************************************************
Generic Handling
*****************************************************************************}
{$ifdef TEST_GENERIC}
{$i generic.inc}
{$endif TEST_GENERIC}
{*****************************************************************************
Directory Handling
*****************************************************************************}
procedure DosDir(func:byte;const s:string);
var
buffer : array[0..255] of char;
regs : trealregs;
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
AllowSlash(pchar(@buffer));
{ True DOS does not like backslashes at end
Win95 DOS accepts this !!
but "\" and "c:\" should still be kept and accepted hopefully PM }
if (length(s)>0) and (buffer[length(s)-1]='\') and
Not ((length(s)=1) or ((length(s)=3) and (s[2]=':'))) then
buffer[length(s)-1]:=#0;
syscopytodos(longint(@buffer),length(s)+1);
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$7100+func
else
{$endif RTLLITE}
regs.realeax:=func shl 8;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
GetInOutRes(lo(regs.realeax));
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];
var
regs : trealregs;
begin
If InOutRes <> 0 then
exit;
{ First handle Drive changes }
if (length(s)>=2) and (s[2]=':') then
begin
regs.realedx:=(ord(s[1]) and (not 32))-ord('A');
regs.realeax:=$0e00;
sysrealintr($21,regs);
regs.realeax:=$1900;
sysrealintr($21,regs);
if byte(regs.realeax)<>byte(regs.realedx) then
begin
Inoutres:=15;
exit;
end;
{ DosDir($3b,'c:') give Path not found error on
pure DOS PM }
if length(s)=2 then
exit;
end;
{ do the normal dos chdir }
DosDir($3b,s);
end;
procedure getdir(drivenr : byte;var dir : shortstring);
var
temp : array[0..255] of char;
i : longint;
regs : trealregs;
begin
regs.realedx:=drivenr;
regs.realesi:=tb_offset;
regs.realds:=tb_segment;
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$7147
else
{$endif RTLLITE}
regs.realeax:=$4700;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
Begin
GetInOutRes(lo(regs.realeax));
exit;
end
else
syscopyfromdos(longint(@temp),251);
{ conversion to Pascal string including slash conversion }
i:=0;
while (temp[i]<>#0) do
begin
if temp[i]='/' then
temp[i]:='\';
dir[i+4]:=temp[i];
inc(i);
end;
dir[2]:=':';
dir[3]:='\';
dir[0]:=char(i+3);
{ upcase the string }
if not FileNameCaseSensitive then
dir:=upcase(dir);
if drivenr<>0 then { Drive was supplied. We know it }
dir[1]:=char(65+drivenr-1)
else
begin
{ We need to get the current drive from DOS function 19H }
{ because the drive was the default, which can be unknown }
regs.realeax:=$1900;
sysrealintr($21,regs);
i:= (regs.realeax and $ff) + ord('A');
dir[1]:=chr(i);
end;
end;
{*****************************************************************************
SystemUnit Initialization
*****************************************************************************}
{$ifndef RTLLITE}
function CheckLFN:boolean;
var
regs : TRealRegs;
RootName : pchar;
begin
{ Check LFN API on drive c:\ }
RootName:='C:\';
syscopytodos(longint(RootName),strlen(RootName)+1);
{ Call 'Get Volume Information' ($71A0) }
regs.realeax:=$71a0;
regs.reales:=tb_segment;
regs.realedi:=tb_offset;
regs.realecx:=32;
regs.realds:=tb_segment;
regs.realedx:=tb_offset;
regs.realflags:=carryflag;
sysrealintr($21,regs);
{ If carryflag=0 and LFN API bit in ebx is set then use Long file names }
CheckLFN:=(regs.realflags and carryflag=0) and (regs.realebx and $4000=$4000);
end;
{$endif RTLLITE}
{$ifdef MT}
{$I thread.inc}
{$endif MT}
{$ifndef RTLLITE}
{$ifdef EXCEPTIONS_IN_SYSTEM}
{$define IN_SYSTEM}
{$i dpmiexcp.pp}
{$endif EXCEPTIONS_IN_SYSTEM}
{$endif RTLLITE}
var
temp_int : tseginfo;
Begin
{ save old int 0 and 75 }
get_pm_interrupt($00,old_int00);
get_pm_interrupt($75,old_int75);
temp_int.segment:=get_cs;
temp_int.offset:=@new_int00;
set_pm_interrupt($00,temp_int);
{$ifndef EXCEPTIONS_IN_SYSTEM}
temp_int.offset:=@new_int75;
set_pm_interrupt($75,temp_int);
{$endif EXCEPTIONS_IN_SYSTEM}
{ to test stack depth }
loweststack:=maxlongint;
{ Setup heap }
InitHeap;
{$ifdef MT}
{ before this, you can't use thread vars !!!! }
{ threadvarblocksize is calculate before the initialization }
{ of the system unit }
mainprogramthreadblock := sysgetmem(threadvarblocksize);
{$endif MT}
InitExceptions;
{ Setup stdin, stdout and stderr }
OpenStdIO(Input,fmInput,StdInputHandle);
OpenStdIO(Output,fmOutput,StdOutputHandle);
OpenStdIO(StdOut,fmOutput,StdOutputHandle);
OpenStdIO(StdErr,fmOutput,StdErrorHandle);
{ Setup environment and arguments }
Setup_Environment;
Setup_Arguments;
{ Use LFNSupport LFN }
LFNSupport:=CheckLFN;
if LFNSupport then
FileNameCaseSensitive:=true;
{ Reset IO Error }
InOutRes:=0;
{$ifndef RTLLITE}
{$ifdef EXCEPTIONS_IN_SYSTEM}
InitDPMIExcp;
InstallDefaultHandlers;
{$endif EXCEPTIONS_IN_SYSTEM}
{$endif RTLLITE}
End.
{
$Log$
Revision 1.40 2000-06-05 06:20:44 pierre
* some typo corrected !
Revision 1.39 2000/06/04 14:14:10 hajny
* FileHandleCount decreased upon unsuccessful increase attempt
Revision 1.38 2000/05/18 07:18:28 pierre
* Added default error value to GetInoOutRes function
Revision 1.37 2000/04/10 11:21:02 pierre
* use only low word of regs record after system calls
Revision 1.36 2000/03/13 19:45:21 pierre
+ exceptions in system is default now
Revision 1.35 2000/03/09 09:15:10 pierre
+ support for djgpp v2.03 (added some new functions that are in v2.03 ofdpmiexcp.c)
+ code to integrate exception support inside the system unit
Revision 1.34 2000/03/07 11:05:58 pierre
* fix for the problem of backslashes at and of directory
+ some code for exception support (far from working :()
+ debug variable accept_sbrk
Revision 1.33 2000/02/09 16:59:29 peter
* truncated log
Revision 1.32 2000/02/09 12:41:14 peter
* halt moved to system.inc
Revision 1.31 2000/01/24 11:57:18 daniel
* !proxy support in environment added (Peter)
Revision 1.30 2000/01/20 23:38:02 peter
* support fm_inout as stdoutput for assign(f,'');rewrite(f,1); becuase
rewrite opens always with filemode 2
Revision 1.29 2000/01/16 22:25:38 peter
* check handle for file closing
Revision 1.28 2000/01/07 16:41:32 daniel
* copyright 2000
Revision 1.27 2000/01/07 16:32:23 daniel
* copyright 2000 added
Revision 1.26 1999/12/20 22:22:41 pierre
* better closing of left open files
Revision 1.25 1999/12/17 23:11:48 pierre
* fix for bug754 : increase now dynamically max open handles
Revision 1.24 1999/12/01 22:57:30 peter
* cmdline support
Revision 1.23 1999/11/25 16:24:56 pierre
* avoid a problem with ChDir('c:') on pure DOS
Revision 1.22 1999/11/06 14:38:24 peter
* truncated log
Revision 1.21 1999/10/31 09:34:48 jonas
* updated for new syntax of sysgetmem
Revision 1.20 1999/10/28 09:53:19 peter
* create can also open file in fminout
Revision 1.19 1999/09/20 12:40:20 pierre
* adapted to new heaph
Revision 1.18 1999/09/10 17:14:09 peter
* better errorcode returning using int21h,5900
Revision 1.17 1999/09/10 15:40:33 peter
* fixed do_open flags to be > $100, becuase filemode can be upto 255
Revision 1.16 1999/09/08 16:09:18 peter
* do_isdevice not called if already error
Revision 1.15 1999/08/19 14:03:16 pierre
* use sysgetmem for startup and debug allocations
Revision 1.14 1999/07/19 07:57:49 michael
+ Small fix from Michael Baikov in setup_params
Revision 1.13 1999/05/19 16:54:21 pierre
* closes all handles >+ 5
Revision 1.12 1999/05/17 21:52:33 florian
* most of the Object Pascal stuff moved to the system unit
}
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