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fpc/rtl/go32v2/system.pp

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{
$Id$
This file is part of the Free Pascal run time library.
Copyright (c) 1993,97 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.
**********************************************************************}
{ no stack check in system }
{$S-}
unit system;
{$I os.inc}
interface
{ 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;
{ Default memory segments (Tp7 compatibility) }
seg0040 = $0040;
segA000 = $A000;
segB000 = $B000;
segB800 = $B800;
var
{ Mem[] support }
mem : array[0..$7fffffff] of byte absolute $0;
memw : array[0..$7fffffff] of word absolute $0;
meml : array[0..$7fffffff] of longint absolute $0;
{ C-compatible arguments and environment }
argc : longint;
argv : ppchar;
envp : ppchar;
dos_argv0 : pchar;
{$ifndef RTLLITE}
{ System info }
LFNSupport : boolean;
{$endif RTLLITE}
type
{ Dos Extender info }
p_stub_info = ^t_stub_info;
t_stub_info = packed record
magic : array[0..15] of char;
size : longint;
minstack : longint;
memory_handle : longint;
initial_size : longint;
minkeep : word;
ds_selector : word;
ds_segment : word;
psp_selector : word;
cs_selector : word;
env_size : word;
basename : array[0..7] of char;
argv0 : array [0..15] of char;
dpmi_server : array [0..15] of char;
end;
p_go32_info_block = ^t_go32_info_block;
t_go32_info_block = packed record
size_of_this_structure_in_bytes : longint; {offset 0}
linear_address_of_primary_screen : longint; {offset 4}
linear_address_of_secondary_screen : longint; {offset 8}
linear_address_of_transfer_buffer : longint; {offset 12}
size_of_transfer_buffer : longint; {offset 16}
pid : longint; {offset 20}
master_interrupt_controller_base : byte; {offset 24}
slave_interrupt_controller_base : byte; {offset 25}
selector_for_linear_memory : word; {offset 26}
linear_address_of_stub_info_structure : longint; {offset 28}
linear_address_of_original_psp : longint; {offset 32}
run_mode : word; {offset 36}
run_mode_info : word; {offset 38}
end;
var
stub_info : p_stub_info;
go32_info_block : t_go32_info_block;
{
necessary for objects.pas, should be removed (at least from the interface
to the implementation)
}
type
trealregs=record
realedi,realesi,realebp,realres,
realebx,realedx,realecx,realeax : longint;
realflags,
reales,realds,realfs,realgs,
realip,realcs,realsp,realss : word;
end;
function do_write(h,addr,len : longint) : longint;
function do_read(h,addr,len : longint) : longint;
procedure syscopyfromdos(addr : longint; len : longint);
procedure syscopytodos(addr : longint; len : longint);
procedure sysrealintr(intnr : word;var regs : trealregs);
function tb : longint;
implementation
{ include system independent routines }
{$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;
{$ASMMODE DIRECT}
{*****************************************************************************
Go32 Helpers
*****************************************************************************}
function far_strlen(selector : word;linear_address : longint) : longint;
begin
asm
movl linear_address,%edx
movl %edx,%ecx
movw selector,%gs
.Larg19:
movb %gs:(%edx),%al
testb %al,%al
je .Larg20
incl %edx
jmp .Larg19
.Larg20:
movl %edx,%eax
subl %ecx,%eax
movl %eax,__RESULT
end;
end;
{$ASMMODE ATT}
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 $2,%ecx
rep
movsl
cld
popw %ds
popw %es
end ['ESI','EDI','ECX'];
end;
function atohex(s : pchar) : longint;
var
rv : longint;
v : byte;
begin
rv:=0;
while (s^ <>#0) do
begin
v:=byte(s^)-byte('0');
if (v > 9) then
dec(v,7);
v:=v and 15; { in case it's lower case }
rv:=(rv shl 4) or v;
inc(longint(s));
end;
atohex:=rv;
end;
procedure setup_arguments;
type arrayword = array [0..0] of word;
var psp : word;
i,j : byte;
quote : char;
proxy_s : string[7];
tempargv : ppchar;
al,proxy_argc,proxy_seg,proxy_ofs,lin : longint;
largs : array[0..127] of pchar;
rm_argv : ^arrayword;
begin
for i := 1 to 127 do
largs[i] := nil;
psp:=stub_info^.psp_selector;
largs[0]:=dos_argv0;
argc := 1;
sysseg_move(psp, 128, get_ds, longint(@doscmd), 128);
{$IfDef SYSTEMDEBUG}
Writeln(stderr,'Dos command line is #',doscmd,'# size = ',length(doscmd));
{$EndIf SYSTEMDEBUG}
j := 1;
quote := #0;
for i:=1 to length(doscmd) do
Begin
if doscmd[i] = quote then
begin
quote := #0;
doscmd[i] := #0;
largs[argc]:=@doscmd[j];
inc(argc);
j := i+1;
end else
if (quote = #0) and ((doscmd[i] = '''') or (doscmd[i]='"')) then
begin
quote := doscmd[i];
j := i + 1;
end else
if (quote = #0) and ((doscmd[i] = ' ')
or (doscmd[i] = #9) or (doscmd[i] = #10) or
(doscmd[i] = #12) or (doscmd[i] = #9)) then
begin
doscmd[i]:=#0;
if j<i then
begin
largs[argc]:=@doscmd[j];
inc(argc);
j := i+1;
end else inc(j);
end else
if (i = length(doscmd)) then
begin
doscmd[i+1]:=#0;
largs[argc]:=@doscmd[j];
inc(argc);
end;
end;
if (argc > 1) and (far_strlen(get_ds,longint(largs[1])) = 6) then
begin
move(largs[1]^,proxy_s[1],6);
proxy_s[0] := #6;
if (proxy_s = '!proxy') then
begin
{$IfDef SYSTEMDEBUG}
Writeln(stderr,'proxy command line ');
{$EndIf SYSTEMDEBUG}
proxy_argc := atohex(largs[2]);
proxy_seg := atohex(largs[3]);
proxy_ofs := atohex(largs[4]);
getmem(rm_argv,proxy_argc*sizeof(word));
sysseg_move(dos_selector,proxy_seg*16+proxy_ofs, get_ds,longint(rm_argv),proxy_argc*sizeof(word));
for i:=0 to proxy_argc - 1 do
begin
lin := proxy_seg*16 + rm_argv^[i];
al :=far_strlen(dos_selector, lin);
getmem(largs[i],al+1);
sysseg_move(dos_selector, lin, get_ds,longint(largs[i]), al+1);
{$IfDef SYSTEMDEBUG}
Writeln(stderr,'arg ',i,' #',largs[i],'#');
{$EndIf SYSTEMDEBUG}
end;
argc := proxy_argc;
end;
end;
getmem(argv,argc shl 2);
for i := 0 to argc-1 do
argv[i] := largs[i];
tempargv:=argv;
{$ASMMODE DIRECT}
asm
movl tempargv,%eax
movl %eax,_args
end;
{$ASMMODE ATT}
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 $8
end;
end;
procedure setup_environment;
var env_selector : word;
env_count : longint;
dos_env,cp : pchar;
stubaddr : p_stub_info;
begin
{$ASMMODE DIRECT}
asm
movl __stubinfo,%eax
movl %eax,stubaddr
end;
{$ASMMODE ATT}
stub_info:=stubaddr;
getmem(dos_env,stub_info^.env_size);
env_count:=0;
sysseg_move(stub_info^.psp_selector,$2c, get_ds, longint(@env_selector), 2);
sysseg_move(env_selector, 0, get_ds, longint(dos_env), stub_info^.env_size);
cp:=dos_env;
while cp ^ <> #0 do
begin
inc(env_count);
while (cp^ <> #0) do inc(longint(cp)); { skip to NUL }
inc(longint(cp)); { skip to next character }
end;
getmem(envp,(env_count+1) * sizeof(pchar));
if (envp = nil) then exit;
cp:=dos_env;
env_count:=0;
while cp^ <> #0 do
begin
getmem(envp[env_count],strlen(cp)+1);
strcopy(envp[env_count], cp);
{$IfDef SYSTEMDEBUG}
Writeln(stderr,'env ',env_count,' = "',envp[env_count],'"');
{$EndIf SYSTEMDEBUG}
inc(env_count);
while (cp^ <> #0) do
inc(longint(cp)); { skip to NUL }
inc(longint(cp)); { skip to next character }
end;
envp[env_count]:=nil;
longint(cp):=longint(cp)+3;
getmem(dos_argv0,strlen(cp)+1);
if (dos_argv0 = nil) then halt;
strcopy(dos_argv0, cp);
{ update ___dos_argv0 also }
{$ASMMODE DIRECT}
asm
movl U_SYSTEM_DOS_ARGV0,%eax
movl %eax,___dos_argv0
end;
{$ASMMODE ATT}
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 $0x31
movl intaddr,%eax
movl %edx,(%eax)
movw %cx,4(%eax)
end;
end;
{$ifdef SYSTEMDEBUG}
{ Keep Track of open files }
const
max_files = 50;
free_closed_names : boolean = true;
var
opennames : array [0..max_files-1] of pchar;
openfiles : array [0..max_files-1] of boolean;
{$endif SYSTEMDEBUG}
{*****************************************************************************
ParamStr/Randomize
*****************************************************************************}
{$ASMMODE DIRECT}
procedure halt(errnum : byte);
{$ifdef SYSTEMDEBUG}
var h : byte;
{$endif SYSTEMDEBUG}
begin
do_exit;
{$ifdef SYSTEMDEBUG}
for h:=0 to max_files do
if openfiles[h] then
writeln(stderr,'file ',opennames[h],' not closed at exit');
{$endif SYSTEMDEBUG}
{ halt is not allways called !! }
{ not on normal exit !! PM }
set_pm_interrupt($00,old_int00);
set_pm_interrupt($75,old_int75);
asm
movzbw errnum,%ax
pushw %ax
call ___exit {frees all dpmi memory !!}
end;
end;
procedure new_int00;
begin
HandleError(200);
end;
procedure new_int75;
begin
asm
xorl %eax,%eax
outb %al,$0x0f0
movb $0x20,%al
outb %al,$0x0a0
outb %al,$0x020
end;
HandleError(200);
end;
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 U_SYSTEM_LOWESTSTACK,%ebx
cmpl %eax,%ebx
jb .L_is_not_lowest
movl %eax,U_SYSTEM_LOWESTSTACK
.L_is_not_lowest:
{$endif SYSTEMDEBUG}
movl __stkbottom,%ebx
cmpl %eax,%ebx
jae .L__short_on_stack
popl %ebx
popl %eax
leave
ret $4
.L__short_on_stack:
{ can be usefull for error recovery !! }
popl %ebx
popl %eax
end['EAX','EBX'];
HandleError(202);
end;
{$ASMMODE ATT}
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:=regs.realedx and $ffff;
randseed:=hl*$10000+ (regs.realecx and $ffff);
end;
{*****************************************************************************
Heap Management
*****************************************************************************}
{$ASMMODE DIRECT}
function getheapstart:pointer;assembler;
asm
leal HEAP,%eax
end ['EAX'];
function getheapsize:longint;assembler;
asm
movl HEAPSIZE,%eax
end ['EAX'];
function Sbrk(size : longint):longint;assembler;
asm
movl size,%eax
pushl %eax
call ___sbrk
addl $4,%esp
end;
{$ASMMODE ATT}
{ include standard heap management }
{$I heap.inc}
{****************************************************************************
Low level File Routines
****************************************************************************}
procedure AllowSlash(p:pchar);
var
i : longint;
begin
{ allow slash as backslash }
for i:=0 to strlen(p) do
if p[i]='/' then p[i]:='\';
end;
procedure do_close(handle : longint);
var
regs : trealregs;
begin
regs.realebx:=handle;
{$ifdef SYSTEMDEBUG}
if handle<max_files then
begin
openfiles[handle]:=false;
if assigned(opennames[handle]) and free_closed_names then
begin
freemem(opennames[handle],strlen(opennames[handle])+1);
opennames[handle]:=nil;
end;
end;
{$endif SYSTEMDEBUG}
regs.realeax:=$3e00;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
InOutRes:=lo(regs.realeax);
end;
procedure do_erase(p : pchar);
var
regs : trealregs;
begin
AllowSlash(p);
syscopytodos(longint(p),strlen(p)+1);
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
{$ifndef RTLLITE}
if LFNSupport then
regs.realeax:=$7141
else
{$endif RTLLITE}
regs.realeax:=$4100;
regs.realesi:=0;
regs.realecx:=0;
sysrealintr($21,regs);
if (regs.realflags and carryflag) <> 0 then
InOutRes:=lo(regs.realeax);
end;
procedure do_rename(p1,p2 : pchar);
var
regs : trealregs;
begin
AllowSlash(p1);
AllowSlash(p2);
if strlen(p1)+strlen(p2)+3>tb_size then
HandleError(217);
sysseg_move(get_ds,longint(p2),dos_selector,tb,strlen(p2)+1);
sysseg_move(get_ds,longint(p1),dos_selector,tb+strlen(p2)+2,strlen(p1)+1);
regs.realedi:=tb_offset;
regs.realedx:=tb_offset + strlen(p2)+2;
regs.realds:=tb_segment;
regs.reales:=tb_segment;
{$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
InOutRes:=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
InOutRes:=lo(regs.realeax);
exit(writesize);
end;
len:=len-size;
writesize:=writesize+size;
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
InOutRes:=lo(regs.realeax);
do_read:=0;
exit;
end
else
if regs.realeax<size then
begin
syscopyfromdos(addr+readsize,regs.realeax);
do_read:=readsize+regs.realeax;
exit;
end;
syscopyfromdos(addr+readsize,regs.realeax);
readsize:=readsize+regs.realeax;
len:=len-regs.realeax;
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
InOutRes:=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
InOutRes:=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
InOutRes:=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
InOutRes:=lo(regs.realeax);
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 $10) the file will be append
when (flags and $100) the file will be truncate/rewritten
when (flags and $1000) there is no check for close (needed for textfiles)
}
var
regs : trealregs;
action : longint;
begin
AllowSlash(p);
{ close first if opened }
if ((flags and $1000)=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 $100)<>0 then
begin
filerec(f).mode:=fmoutput;
action:=$12; {create file function}
end;
{ empty name is special }
if p[0]=#0 then
begin
case filerec(f).mode of
fminput : filerec(f).handle:=StdInputHandle;
fmappend,
fmoutput : begin
filerec(f).handle:=StdOutputHandle;
filerec(f).mode:=fmoutput; {fool fmappend}
end;
end;
exit;
end;
{ real dos call }
syscopytodos(longint(p),strlen(p)+1);
{$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($21,regs);
if (regs.realflags and carryflag) <> 0 then
begin
InOutRes:=lo(regs.realeax);
exit;
end
else
filerec(f).handle:=regs.realeax;
{$ifdef SYSTEMDEBUG}
if regs.realeax<max_files then
begin
openfiles[regs.realeax]:=true;
getmem(opennames[regs.realeax],strlen(p)+1);
move(p^,opennames[regs.realeax]^,strlen(p)+1);
end;
{$endif SYSTEMDEBUG}
{ append mode }
if (flags and $10)<>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 $80)<>0;
if (regs.realflags and carryflag) <> 0 then
InOutRes:=lo(regs.realeax);
end;
{*****************************************************************************
UnTyped File Handling
*****************************************************************************}
{$i file.inc}
{*****************************************************************************
Typed File Handling
*****************************************************************************}
{$i typefile.inc}
{*****************************************************************************
Text File Handling
*****************************************************************************}
{$DEFINE EOF_CTRLZ}
{$i text.inc}
{*****************************************************************************
Directory Handling
*****************************************************************************}
procedure DosDir(func:byte;const s:string);
var
buffer : array[0..255] of char;
regs : trealregs;
begin
move(s[1],buffer,length(s));
buffer[length(s)]:=#0;
AllowSlash(pchar(@buffer));
syscopytodos(longint(@buffer),length(s)+1);
regs.realedx:=tb_offset;
regs.realds:=tb_segment;
{$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
InOutRes:=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;
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
InOutRes:=lo(regs.realeax);
exit;
end
else
syscopyfromdos(longint(@temp),251);
{ conversation 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 }
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}
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);
{ temp_int.offset:=@new_int75;
set_pm_interrupt($75,temp_int); }
{ to test stack depth }
loweststack:=maxlongint;
{ Setup heap }
InitHeap;
{ Setup stdin, stdout and stderr }
OpenStdIO(Input,fmInput,StdInputHandle);
OpenStdIO(Output,fmOutput,StdOutputHandle);
OpenStdIO(StdErr,fmOutput,StdErrorHandle);
{ Setup environment and arguments }
Setup_Environment;
Setup_Arguments;
{ Use LFNSupport LFN }
LFNSupport:=CheckLFN;
{ Reset IO Error }
InOutRes:=0;
End.
{
$Log$
Revision 1.2 1998-12-21 14:22:02 pierre
* old_int?? transformed to cvar to be readable by dpmiexcp
Revision 1.1 1998/12/21 13:07:03 peter
* use -FE
Revision 1.25 1998/12/15 22:42:52 peter
* removed temp symbols
Revision 1.24 1998/11/29 22:28:10 peter
+ io-error 103 added
Revision 1.23 1998/11/16 14:15:02 pierre
* changed getdir(byte,string) to getdir(byte,shortstring)
Revision 1.22 1998/10/26 14:49:46 pierre
* system debug info output to stderr
Revision 1.21 1998/10/20 07:34:07 pierre
+ systemdebug reports about unclosed files at exit
Revision 1.20 1998/10/13 21:41:06 peter
+ int 0 for divide by zero
Revision 1.19 1998/09/14 10:48:05 peter
* FPC_ names
* Heap manager is now system independent
Revision 1.18 1998/08/28 10:48:04 peter
* fixed chdir with drive changing
* updated checklfn from mailinglist
Revision 1.17 1998/08/27 10:30:51 pierre
* go32v1 RTL did not compile (LFNsupport outside go32v2 defines !)
I renamed tb_selector to tb_segment because
it is a real mode segment as opposed to
a protected mode selector
Fixed it for go32v1 (remove the $E0000000 offset !)
Revision 1.16 1998/08/26 10:04:03 peter
* new lfn check from mailinglist
* renamed win95 -> LFNSupport
+ tb_selector, tb_offset for easier access to transferbuffer
Revision 1.15 1998/08/19 10:56:34 pierre
+ added some special code for C interface
to avoid loading of crt1.o or dpmiexcp.o from the libc.a
Revision 1.14 1998/08/04 14:34:38 pierre
* small bug fix to get it compiled with bugfix version !!
(again the asmmode problem !!!
Peter it was really not the best idea you had !!)
Revision 1.13 1998/07/30 13:26:22 michael
+ Added support for ErrorProc variable. All internal functions are required
to call HandleError instead of runerror from now on.
This is necessary for exception support.
Revision 1.12 1998/07/13 21:19:08 florian
* some problems with ansi string support fixed
Revision 1.11 1998/07/07 12:33:08 carl
* added 2k buffer for stack checking for correct io on error
Revision 1.10 1998/07/02 12:29:20 carl
* IOCheck for rmdir,chdir and mkdir as in TP
NOTE: I'm pretty SURE this will not compile and link correctly with FPC
0.99.5
Revision 1.9 1998/07/01 15:29:57 peter
* better readln/writeln
Revision 1.8 1998/06/26 08:19:10 pierre
+ all debug in ifdef SYSTEMDEBUG
+ added local arrays :
opennames names of opened files
fileopen boolean array to know if still open
usefull with gdb if you get problems about too
many open files !!
Revision 1.7 1998/06/15 15:17:08 daniel
* RTLLITE conditional added to produce smaller RTL.
Revision 1.6 1998/05/31 14:18:29 peter
* force att or direct assembling
* cleanup of some files
Revision 1.5 1998/05/21 19:30:52 peter
* objects compiles for linux
+ assign(pchar), assign(char), rename(pchar), rename(char)
* fixed read_text_as_array
+ read_text_as_pchar which was not yet in the rtl
Revision 1.4 1998/05/04 17:58:41 peter
* fix for smartlinking with _ARGS
Revision 1.3 1998/05/04 16:21:54 florian
+ LFNSupport flag to the interface moved
}
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