freepascal.compiler/compiler/globals.pas

{
    $Id$
    Copyright (C) 1993-98 by Florian Klaempfl

    This unit implements some support functions and global variables

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}

{$ifdef tp}
  {$E+,N+}
{$endif}

unit globals;

  interface

    uses
{$ifdef win32}
      windows,
{$endif}
{$ifdef linux}
      linux,
{$endif}
{$ifdef Delphi4}
      dmisc,
      sysutils,
{$else}
      strings,dos,
{$endif}
{$ifdef TP}
      objects,
{$endif}
      globtype,version,tokens,systems,cobjects;

    const
{$ifdef linux}
       DirSep = '/';
{$else}
  {$ifdef amiga}
       DirSep = '/';
  {$else}
       DirSep = '\';
  {$endif}
{$endif}

{$ifdef Splitheap}
       testsplit : boolean = false;
{$endif Splitheap}

       delphimodeswitches : tmodeswitches=
         [m_delphi,m_tp,m_all,m_class,m_objpas,m_result,m_string_pchar,
          m_pointer_2_procedure,m_autoderef,m_tp_procvar,m_initfinal];
       fpcmodeswitches    : tmodeswitches=
         [m_fpc,m_all,m_string_pchar,m_nested_comment,m_repeat_forward,
          m_cvar_support,m_initfinal,m_add_pointer];
       objfpcmodeswitches : tmodeswitches=
         [m_objfpc,m_fpc,m_all,m_class,m_objpas,m_result,m_string_pchar,m_nested_comment,
          m_repeat_forward,m_cvar_support,m_initfinal,m_add_pointer];
       tpmodeswitches     : tmodeswitches=
         [m_tp,m_all,m_tp_procvar];
       gpcmodeswitches    : tmodeswitches=
         [m_gpc,m_all];

    type
       TSearchPathList = object(TStringQueue)
         procedure AddPath(s:string;addfirst:boolean);
         procedure AddList(list:TSearchPathList;addfirst:boolean);
         function  FindFile(const f : string;var b : boolean) : string;
       end;

    var
       { specified inputfile }
       inputdir       : dirstr;
       inputfile      : namestr;
       inputextension : extstr;
       { specified outputfile with -o parameter }
       outputfile     : namestr;
       { specified with -FE or -FU }
       outputexedir   : dirstr;
       outputunitdir  : dirstr;

       { things specified with parameters }
       paralinkoptions,
       paradynamiclinker : string;
       parapreprocess    : boolean;

       { directory where the utils can be found (options -FD) }
       utilsdirectory : dirstr;

       { some flags for global compiler switches }
       do_build,
       do_make       : boolean;
       not_unit_proc : boolean;
       { path for searching units, different paths can be seperated by ; }
       exepath            : dirstr;  { Path to ppc }
       librarysearchpath,
       unitsearchpath,
       objectsearchpath,
       includesearchpath  : TSearchPathList;

       { deffile }
       usewindowapi  : boolean;
       description   : string;

       { current position }
       token,                        { current token being parsed }
       idtoken    : ttoken;          { holds the token if the pattern is a known word }
       tokenpos,                     { last postion of the read token }
       aktfilepos : tfileposinfo;    { current position }

       { type of currently parsed block }
       { isn't full implemented (FK)    }
       block_type : tblock_type;

       in_args : boolean;                { arguments must be checked especially }
       parsing_para_level : longint;     { parameter level, used to convert
                                             proc calls to proc loads in firstcalln }
       { Must_be_valid : boolean;           should the variable already have a value
        obsolete replace by set_varstate function }
       compile_level : word;
       make_ref : boolean;
       resolving_forward : boolean;      { used to add forward reference as second ref }
       use_esp_stackframe : boolean;     { to test for call with ESP as stack frame }

{$ifdef TP}
       use_big      : boolean;
{$endif}

     { commandline values }
       initdefines        : tlinkedlist;
       initglobalswitches : tglobalswitches;
       initmoduleswitches : tmoduleswitches;
       initlocalswitches  : tlocalswitches;
       initmodeswitches   : tmodeswitches;
       initpackenum       : longint;
       initpackrecords    : tpackrecords;
       initoutputformat   : tasm;
       initoptprocessor   : tprocessors;
       initasmmode        : tasmmode;
     { current state values }
       aktglobalswitches : tglobalswitches;
       aktmoduleswitches : tmoduleswitches;
       aktlocalswitches  : tlocalswitches;
       aktmodeswitches   : tmodeswitches;
       aktpackenum       : longint;
       aktpackrecords    : tpackrecords;
       aktoutputformat   : tasm;
       aktoptprocessor   : tprocessors;
       aktasmmode        : tasmmode;

     { Memory sizes }
       heapsize,
       maxheapsize,
       stacksize    : longint;

{$Ifdef EXTDEBUG}
       total_of_firstpass,
       firstpass_several : longint;
{$ifdef FPC}
       EntryMemUsed : longint;
{$endif FPC}
     { parameter switches }
       debugstop,
       only_one_pass : boolean;
{$EndIf EXTDEBUG}
       { windows application type }
       apptype : tapptype;

    const
       RelocSection : boolean = true;
       RelocSectionSetExplicitly : boolean = false;
       DLLsource : boolean = false;
       DLLImageBase : pstring = nil;
       UseDeffileForExport : boolean = true;
       ForceDeffileForExport : boolean = false;

       { used to set all registers used for each global function
         this should dramatically decrease the number of
         recompilations needed PM }
       simplify_ppu : boolean = false;

       { should we allow non static members ? }
       allow_only_static : boolean = false;

       Inside_asm_statement : boolean = false;

    { for error info in pp.pas }
    const
       parser_current_file : string = '';

{$ifdef debug}
    { if the pointer don't point to the heap then write an error }
    function assigned(p : pointer) : boolean;
{$endif}
    function min(a,b : longint) : longint;
    function max(a,b : longint) : longint;
    function align(i,a:longint):longint;
    procedure Replace(var s:string;s1:string;const s2:string);
    procedure ReplaceCase(var s:string;const s1,s2:string);
    function upper(const s : string) : string;
    function lower(const s : string) : string;
    function trimspace(const s:string):string;
    {$ifdef FPC}
    function tostru(i:cardinal) : string;
    {$else}
    function tostru(i:longint) : string;
    {$endif}
    procedure uppervar(var s : string);
    function tostr(i : longint) : string;
    function tostr_with_plus(i : longint) : string;
    procedure valint(S : string;var V : longint;var code : integer);
    function is_number(const s : string) : boolean;
    function ispowerof2(value : longint;var power : longint) : boolean;
    { enable ansistring comparison }
    function compareansistrings(p1,p2 : pchar;length1,length2 : longint) : longint;
    function concatansistrings(p1,p2 : pchar;length1,length2 : longint) : pchar;
    function bstoslash(const s : string) : string;
    procedure abstract;

    function getdatestr:string;
    function gettimestr:string;
    function filetimestring( t : longint) : string;

    procedure DefaultReplacements(var s:string);

    function  path_absolute(const s : string) : boolean;
    Function  FileExists ( Const F : String) : Boolean;
    Function  RemoveFile(const f:string):boolean;
    Function  RemoveDir(d:string):boolean;
    Function  GetFileTime ( Var F : File) : Longint;
    Function  GetNamedFileTime ( Const F : String) : Longint;
    Function  SplitFileName(const s:string):string;
    Function  SplitName(const s:string):string;
    Function  SplitExtension(Const HStr:String):String;
    Function  AddExtension(Const HStr,ext:String):String;
    Function  ForceExtension(Const HStr,ext:String):String;
    Function  FixPath(s:string;allowdot:boolean):string;
    function  FixFileName(const s:string):string;
    procedure SplitBinCmd(const s:string;var bstr,cstr:string);
    procedure SynchronizeFileTime(const fn1,fn2:string);
    function  FindFile(const f : string;path : string;var b : boolean) : string;
    function  FindExe(bin:string;var found:boolean):string;
    function  GetShortName(const n:string):string;

    Procedure Shell(const command:string);
    function  GetEnvPChar(const envname:string):pchar;
    procedure FreeEnvPChar(p:pchar);

    procedure InitGlobals;
    procedure DoneGlobals;


implementation

    uses
      comphook;

    procedure abstract;
      begin
        do_internalerror(255);
      end;


    function ngraphsearchvalue(const s1,s2 : string) : double;
      const
         n = 3;
      var
         equals,i,j : longint;
         hs : string;
      begin
         equals:=0;
         { is the string long enough ? }
         if min(length(s1),length(s2))-n+1<1 then
           begin
              ngraphsearchvalue:=0.0;
              exit;
           end;
         for i:=1 to length(s1)-n+1 do
           begin
              hs:=copy(s1,i,n);
              for j:=1 to length(s2)-n+1 do
                if hs=copy(s2,j,n) then
                  inc(equals);
           end;
{$ifdef fpc}
         ngraphsearchvalue:=equals/double(max(length(s1),length(s2))-n+1);
{$else}
         ngraphsearchvalue:=equals/(max(length(s1),length(s2))-n+1);
{$endif}
      end;


    function bstoslash(const s : string) : string;
    {
      return string s with all \ changed into /
    }
      var
         i : longint;
      begin
        for i:=1to length(s) do
         if s[i]='\' then
          bstoslash[i]:='/'
         else
          bstoslash[i]:=s[i];
         {$ifndef TP}
           {$ifopt H+}
             setlength(bstoslash,length(s));
           {$else}
             bstoslash[0]:=s[0];
           {$endif}
         {$else}
           bstoslash[0]:=s[0];
         {$endif}
      end;

{$ifdef debug}

    function assigned(p : pointer) : boolean;
{$ifndef FPC}
    {$ifndef DPMI}
      type
         ptrrec = record
            ofs,seg : word;
         end;
      var
         lp : longint;
    {$endif DPMI}
{$endif FPC}
      begin
{$ifdef FPC}
          { Assigned is used for procvar and
            stack stored temp records !! PM }
         (* if (p<>nil) {and
            ((p<heaporg) or
            (p>heapptr))} then
           do_internalerror(230); *)
{$else}
    {$ifdef DPMI}
         assigned:=(p<>nil);
         exit;
    {$else DPMI}
         if p=nil then
           lp:=0
         else
           lp:=longint(ptrrec(p).seg)*16+longint(ptrrec(p).ofs);
         if (lp<>0) and
            ((lp<longint(seg(heaporg^))*16+longint(ofs(heaporg^))) or
            (lp>longint(seg(heapptr^))*16+longint(ofs(heapptr^)))) then
           do_internalerror(230);
    {$endif DPMI}
{$endif FPC}
         assigned:=(p<>nil);
      end;
{$endif}


    function min(a,b : longint) : longint;
    {
      return the minimal of a and b
    }
      begin
         if a>b then
           min:=b
         else
           min:=a;
      end;


    function max(a,b : longint) : longint;
    {
      return the maximum of a and b
    }
      begin
         if a<b then
           max:=b
         else
           max:=a;
      end;


    function align(i,a:longint):longint;
    {
      return value <i> aligned <a> boundary
    }
      begin
        align:=(i+a-1) and not(a-1);
      end;


    procedure Replace(var s:string;s1:string;const s2:string);
      var
         last,
         i  : longint;
      begin
        s1:=upper(s1);
        last:=0;
        repeat
          i:=pos(s1,upper(s));
          if i=last then
           i:=0;
          if (i>0) then
           begin
             Delete(s,i,length(s1));
             Insert(s2,s,i);
             last:=i;
           end;
        until (i=0);
      end;


    procedure ReplaceCase(var s:string;const s1,s2:string);
      var
         last,
         i  : longint;
      begin
        last:=0;
        repeat
          i:=pos(s1,s);
          if i=last then
           i:=0;
          if (i>0) then
           begin
             Delete(s,i,length(s1));
             Insert(s2,s,i);
             last:=i;
           end;
        until (i=0);
      end;


    function upper(const s : string) : string;
    {
      return uppercased string of s
    }
      var
         i  : longint;
      begin
         for i:=1 to length(s) do
          if s[i] in ['a'..'z'] then
           upper[i]:=char(byte(s[i])-32)
          else
           upper[i]:=s[i];
        upper[0]:=s[0];
      end;


    function lower(const s : string) : string;
    {
      return lowercased string of s
    }
      var
         i : longint;
      begin
         for i:=1 to length(s) do
          if s[i] in ['A'..'Z'] then
           lower[i]:=char(byte(s[i])+32)
          else
           lower[i]:=s[i];
        lower[0]:=s[0];
      end;


    procedure uppervar(var s : string);
    {
      uppercase string s
    }
      var
         i : longint;
      begin
         for i:=1 to length(s) do
          if s[i] in ['a'..'z'] then
           s[i]:=char(byte(s[i])-32);
      end;


{$ifdef FPC}
   function tostru(i:cardinal):string;
   {
     return string of value i, but for cardinals
   }
      var
        hs : string;
      begin
        str(i,hs);
        tostru:=hs;
      end;
{$else FPC}
    function tostru(i:longint):string;
      begin
        tostru:=tostr(i);
      end;
{$endif FPC}


   function trimspace(const s:string):string;
   {
     return s with all leading and ending spaces and tabs removed
   }
     var
       i,j : longint;
     begin
       i:=length(s);
       while (i>0) and (s[i] in [#9,' ']) do
        dec(i);
       j:=1;
       while (j<i) and (s[j] in [#9,' ']) do
        inc(j);
       trimspace:=Copy(s,j,i-j+1);
     end;


   function tostr(i : longint) : string;
   {
     return string of value i
   }
     var
        hs : string;
     begin
        str(i,hs);
        tostr:=hs;
     end;


   function tostr_with_plus(i : longint) : string;
   {
     return string of value i, but always include a + when i>=0
   }
     var
        hs : string;
     begin
        str(i,hs);
        if i>=0 then
          tostr_with_plus:='+'+hs
        else
          tostr_with_plus:=hs;
     end;


    procedure valint(S : string;var V : longint;var code : integer);
    {
      val() with support for octal, which is not supported under tp7
    }
{$ifndef FPC}
      var
        vs : longint;
        c  : byte;
      begin
        if s[1]='%' then
          begin
             vs:=0;
             longint(v):=0;
             for c:=2 to length(s) do
               begin
                  if s[c]='0' then
                    vs:=vs shl 1
                  else
                  if s[c]='1' then
                    vs:=vs shl 1+1
                  else
                    begin
                      code:=c;
                      exit;
                    end;
               end;
             code:=0;
             longint(v):=vs;
          end
        else
         system.val(S,V,code);
      end;
{$else not FPC}
      begin
         system.val(S,V,code);
      end;
{$endif not FPC}


    function is_number(const s : string) : boolean;
    {
      is string a correct number ?
    }
      var
         w : integer;
         l : longint;
      begin
         valint(s,l,w);
         is_number:=(w=0);
      end;


    function ispowerof2(value : longint;var power : longint) : boolean;
    {
      return if value is a power of 2. And if correct return the power
    }
      var
         hl : longint;
         i : longint;
      begin
         hl:=1;
         ispowerof2:=true;
         for i:=0 to 31 do
           begin
              if hl=value then
                begin
                   power:=i;
                   exit;
                end;
              hl:=hl shl 1;
           end;
         ispowerof2:=false;
      end;


    { enable ansistring comparison }
    { 0 means equal }
    { 1 means p1 > p2 }
    { -1 means p1 < p2 }
    function compareansistrings(p1,p2 : pchar;length1,length2 : longint) : longint;

      var
         i,j : longint;
      begin
         compareansistrings:=0;
         j:=min(length1,length2);
         i:=0;
         while (i<j) do
          begin
            if p1[i]>p2[i] then
             begin
               compareansistrings:=1;
               exit;
             end
            else
             if p1[i]<p2[i] then
              begin
                compareansistrings:=-1;
                exit;
              end;
            inc(i);
          end;
         if length1>length2 then
          compareansistrings:=1
         else
          if length1<length2 then
           compareansistrings:=-1;
      end;


    function concatansistrings(p1,p2 : pchar;length1,length2 : longint) : pchar;
      var
         p : pchar;
      begin
         getmem(p,length1+length2+1);
         move(p1[0],p[0],length1);
         move(p2[0],p[length1],length2+1);
         concatansistrings:=p;
      end;


{****************************************************************************
                               Time Handling
****************************************************************************}

    Function L0(l:longint):string;
    {
      return the string of value l, if l<10 then insert a zero, so
      the string is always at least 2 chars '01','02',etc
    }
      var
        s : string;
      begin
        Str(l,s);
        if l<10 then
         s:='0'+s;
        L0:=s;
      end;


   function gettimestr:string;
   {
     get the current time in a string HH:MM:SS
   }
      var
        hour,min,sec,hsec : word;
      begin
{$ifdef delphi}
        dmisc.gettime(hour,min,sec,hsec);
{$else delphi}
        dos.gettime(hour,min,sec,hsec);
{$endif delphi}
        gettimestr:=L0(Hour)+':'+L0(min)+':'+L0(sec);
      end;


   function getdatestr:string;
   {
     get the current date in a string YY/MM/DD
   }
      var
        Year,Month,Day,Wday : Word;
      begin
{$ifdef delphi}
        dmisc.getdate(year,month,day,wday);
{$else}
        dos.getdate(year,month,day,wday);
{$endif}
        getdatestr:=L0(Year)+'/'+L0(Month)+'/'+L0(Day);
      end;


   function  filetimestring( t : longint) : string;
   {
     convert dos datetime t to a string YY/MM/DD HH:MM:SS
   }
     var
     {$ifndef linux}
       DT : DateTime;
     {$endif}
       Year,Month,Day,Hour,Min,Sec : Word;
     begin
       if t=-1 then
        begin
          FileTimeString:='Not Found';
          exit;
        end;
     {$ifndef linux}
       unpacktime(t,DT);
       Year:=dT.year;month:=dt.month;day:=dt.day;
       Hour:=dt.hour;min:=dt.min;sec:=dt.sec;
     {$else}
       EpochToLocal (t,year,month,day,hour,min,sec);
     {$endif}
       filetimestring:=L0(Year)+'/'+L0(Month)+'/'+L0(Day)+' '+L0(Hour)+':'+L0(min)+':'+L0(sec);
     end;

{****************************************************************************
                          Default Macro Handling
****************************************************************************}

     procedure DefaultReplacements(var s:string);
       begin
         { Replace some macro's }
         Replace(s,'$FPCVER',full_version_string);
         Replace(s,'$FPCDATE',date_string);
         Replace(s,'$FPCTARGET',target_cpu_string);
         Replace(s,'$FPCCPU',target_cpu_string);
         Replace(s,'$TARGET',target_path);
         Replace(s,'$FPCOS',target_path);
       end;


{****************************************************************************
                               File Handling
****************************************************************************}

   function path_absolute(const s : string) : boolean;
   {
     is path s an absolute path?
   }
     begin
        path_absolute:=false;
{$ifdef linux}
        if (length(s)>0) and (s[1]='/') then
          path_absolute:=true;
{$else linux}
  {$ifdef amiga}
        if ((length(s)>0) and ((s[1]='\') or (s[1]='/'))) or (Pos(':',s) = length(s)) then
          path_absolute:=true;
  {$else}
        if ((length(s)>0) and ((s[1]='\') or (s[1]='/'))) or
           ((length(s)>2) and (s[2]=':') and ((s[3]='\') or (s[3]='/'))) then
          path_absolute:=true;
  {$endif amiga}
{$endif linux}
     end;

{$ifndef FPC}
    Procedure FindClose(var Info : SearchRec);
      Begin
      End;
{$endif not FPC}
{$ifdef delphi}
    Function FileExists ( Const F : String) : Boolean;

      begin
         FileExists:=sysutils.FileExists(f);
      end;

{$else}
    Function FileExists ( Const F : String) : Boolean;
      Var
      {$ifdef linux}
         Info : Stat;
      {$else}
         Info : SearchRec;
      {$endif}
      begin
      {$ifdef linux}
        FileExists:=FStat(F,info);
      {$else}
        findfirst(F,readonly+archive+hidden,info);
        FileExists:=(doserror=0);
        findclose(Info);
      {$endif}
      end;
{$endif}


    Function RemoveFile(const f:string):boolean;
      var
        g : file;
      begin
        assign(g,f);
        {$I-}
         erase(g);
        {$I+}
        RemoveFile:=(ioresult=0);
      end;


    Function RemoveDir(d:string):boolean;
      begin
        if d[length(d)]=DirSep then
         Delete(d,length(d),1);
        {$I-}
         rmdir(d);
        {$I+}
        RemoveDir:=(ioresult=0);
      end;


    Function SplitFileName(const s:string):string;
      var
        p : dirstr;
        n : namestr;
        e : extstr;
      begin
        FSplit(s,p,n,e);
        SplitFileName:=n+e;
      end;


    Function SplitName(const s:string):string;
      var
        i,j : longint;
      begin
        i:=Length(s);
        j:=Length(s);
        while (i>0) and not(s[i] in ['/','\']) do
         dec(i);
        while (j>0) and (s[j]<>'.') do
         dec(j);
        if j<=i then
         j:=255;
        SplitName:=Copy(s,i+1,j-(i+1));
      end;


    Function SplitExtension(Const HStr:String):String;
      var
        j : longint;
      begin
        j:=length(Hstr);
        while (j>0) and (Hstr[j]<>'.') do
         begin
           if hstr[j]=DirSep then
            j:=0
           else
            dec(j);
         end;
        if j=0 then
         j:=254;
        SplitExtension:=Copy(Hstr,j,255);
      end;


    Function AddExtension(Const HStr,ext:String):String;
      begin
        if (Ext<>'') and (SplitExtension(HStr)='') then
         AddExtension:=Hstr+Ext
        else
         AddExtension:=Hstr;
      end;


    Function ForceExtension(Const HStr,ext:String):String;
      var
        j : longint;
      begin
        j:=length(Hstr);
        while (j>0) and (Hstr[j]<>'.') do
         dec(j);
        if j=0 then
         j:=255;
        ForceExtension:=Copy(Hstr,1,j-1)+Ext;
      end;


    Function FixPath(s:string;allowdot:boolean):string;
      var
        i : longint;
      begin
        { Fix separator }
        for i:=1 to length(s) do
         if s[i] in ['/','\'] then
          s[i]:=DirSep;
        { Fix ending / }
        if (length(s)>0) and (s[length(s)]<>DirSep) and
           (s[length(s)]<>':') then
         s:=s+DirSep;
        { Remove ./ }
        if (not allowdot) and (s='.'+DirSep) then
         s:='';
        { return }
        FixPath:=s;
      end;


   function FixFileName(const s:string):string;
     var
       i      : longint;
      {$ifdef Linux}
       NoPath : boolean;
      {$endif Linux}
     begin
      {$ifdef Linux}
       NoPath:=true;
      {$endif Linux}
       for i:=length(s) downto 1 do
        begin
          case s[i] of
      {$ifdef Linux}
       '/','\' : begin
                   FixFileName[i]:='/';
                   NoPath:=false; {Skip lowercasing path: 'X11'<>'x11' }
                 end;
      'A'..'Z' : if NoPath then
                  FixFileName[i]:=char(byte(s[i])+32)
                 else
                  FixFileName[i]:=s[i];
      {$else}
           '/' : FixFileName[i]:='\';
      'A'..'Z' : FixFileName[i]:=char(byte(s[i])+32);
      {$endif}
          else
           FixFileName[i]:=s[i];
          end;
        end;
       {$ifndef TP}
         {$ifopt H+}
           SetLength(FixFileName,length(s));
         {$else}
           FixFileName[0]:=s[0];
         {$endif}
       {$else}
         FixFileName[0]:=s[0];
       {$endif}
     end;

   procedure SplitBinCmd(const s:string;var bstr,cstr:string);
     var
       i : longint;
     begin
       i:=pos(' ',s);
       if i>0 then
        begin
          bstr:=Copy(s,1,i-1);
          cstr:=Copy(s,i+1,length(s)-i);
        end
       else
        begin
          bstr:='';
          cstr:='';
        end;
     end;



   procedure TSearchPathList.AddPath(s:string;addfirst:boolean);
     var
       j        : longint;
       CurrentDir,
       CurrPath : string;
       hp       : PStringQueueItem;
     begin
       if s='' then
        exit;
     { Support default macro's }
       DefaultReplacements(s);
     { get current dir }
       GetDir(0,CurrentDir);
       CurrentDir:=FixPath(CurrentDir,false);
       repeat
         j:=Pos(';',s);
         if j=0 then
          j:=255;
       {Get Pathname}
         CurrPath:=FixPath(Copy(s,1,j-1),false);
         if CurrPath='' then
          CurrPath:='.'+DirSep
         else
          begin
            CurrPath:=FixPath(FExpand(CurrPath),false);
            if (Copy(CurrPath,1,length(CurrentDir))=CurrentDir) then
             CurrPath:='.'+DirSep+Copy(CurrPath,length(CurrentDir)+1,255);
          end;
         System.Delete(s,1,j);
         if addfirst then
          begin
            Delete(currPath);
            Insert(currPath);
          end
         else
          begin
            { Check if already in path, then we don't add it }
            hp:=Find(currPath);
            if not assigned(hp) then
             Concat(currPath);
          end;
       until (s='');
     end;


   procedure TSearchPathList.AddList(list:TSearchPathList;addfirst:boolean);
     var
       s : string;
       hl : TSearchPathList;
       hp,hp2 : PStringQueueItem;
     begin
       if list.empty then
        exit;
       { create temp and reverse the list }
       if addfirst then
        begin
          hl.Init;
          hp:=list.first;
          while assigned(hp) do
           begin
             hl.insert(hp^.data^);
             hp:=hp^.next;
           end;
          while not hl.empty do
           begin
             s:=hl.Get;
             Delete(s);
             Insert(s);
           end;
          hl.done;
        end
       else
        begin
          hp:=list.first;
          while assigned(hp) do
           begin
             hp2:=Find(hp^.data^);
             { Check if already in path, then we don't add it }
             if not assigned(hp2) then
              Concat(hp^.data^);
             hp:=hp^.next;
           end;
        end;
     end;


   function TSearchPathList.FindFile(const f : string;var b : boolean) : string;
     Var
       p : PStringQueueItem;
     begin
       FindFile:='';
       b:=false;
       p:=first;
       while assigned(p) do
        begin
          If FileExists(p^.data^+f) then
           begin
             FindFile:=p^.data^;
             b:=true;
             exit;
           end;
          p:=p^.next;
        end;
     end;


   Function GetFileTime ( Var F : File) : Longint;
   Var
   {$ifdef linux}
     Info : Stat;
   {$endif}
     L : longint;
   begin
   {$ifdef linux}
     FStat (F,Info);
     L:=Info.Mtime;
   {$else}
     GetFTime(f,l);
   {$endif}
     GetFileTime:=L;
   end;


   Function GetNamedFileTime (Const F : String) : Longint;
   var
     L : Longint;
   {$ifndef linux}
     info : SearchRec;
   {$else}
     info : stat;
   {$endif}
   begin
     l:=-1;
   {$ifdef linux}
     if FStat (F,Info) then
      L:=info.mtime;
   {$else}
{$ifdef delphi}
     dmisc.FindFirst (F,archive+readonly+hidden,info);
{$else delphi}
     FindFirst (F,archive+readonly+hidden,info);
{$endif delphi}
     if DosError=0 then
      l:=info.time;
     {$ifdef Linux}
       FindClose(info);
     {$endif}
     {$ifdef Win32}
       FindClose(info);
     {$endif}
   {$endif}
     GetNamedFileTime:=l;
   end;


   {Touch Assembler and object time to ppu time is there is a ppufilename}
   procedure SynchronizeFileTime(const fn1,fn2:string);
   var
     f : file;
     l : longint;
   begin
     Assign(f,fn1);
     {$I-}
      reset(f,1);
     {$I+}
     if ioresult=0 then
      begin
        getftime(f,l);
        close(f);
        assign(f,fn2);
        {$I-}
         reset(f,1);
        {$I+}
        if ioresult=0 then
         begin
           setftime(f,l);
           close(f);
         end;
      end;
   end;

   function FindFile(const f : string;path : string;var b : boolean) : string;
      Var
        singlepathstring : string;
        i : longint;
     begin
     {$ifdef linux}
       for i:=1 to length(path) do
        if path[i]=':' then
       path[i]:=';';
     {$endif}
       b:=false;
       FindFile:='';
       repeat
         i:=pos(';',path);
         if i=0 then
           i:=255;
         singlepathstring:=FixPath(copy(path,1,i-1),false);
         delete(path,1,i);
         If FileExists (singlepathstring+f) then
           begin
             FindFile:=singlepathstring;
             b:=true;
             exit;
           end;
       until path='';
     end;

   function FindExe(bin:string;var found:boolean):string;
   begin
     bin:=FixFileName(bin)+source_os.exeext;
{$ifdef delphi}
     FindExe:=FindFile(bin,'.;'+exepath+';'+dmisc.getenv('PATH'),found)+bin;
{$else delphi}
     FindExe:=FindFile(bin,'.;'+exepath+';'+dos.getenv('PATH'),found)+bin;
{$endif delphi}
   end;


    function GetShortName(const n:string):string;
{$ifdef win32}
      var
        hs,hs2 : string;
{$endif}
{$ifdef go32v2}
      var
        hs : string;
{$endif}
      begin
        GetShortName:=n;
{$ifdef win32}
        hs:=n+#0;
        Windows.GetShortPathName(@hs[1],@hs2[1],high(hs2));
        hs2[0]:=chr(strlen(@hs2[1]));
        GetShortName:=hs2;
{$endif}
{$ifdef go32v2}
        hs:=n;
        if Dos.GetShortName(hs) then
         GetShortName:=hs;
{$endif}
      end;


 {****************************************************************************
                               OS Dependent things
 ****************************************************************************}

    function GetEnvPChar(const envname:string):pchar;
      {$ifdef win32}
      var
        s     : string;
        i,len : longint;
        hp,p,p2 : pchar;
      {$endif}
      begin
      {$ifdef linux}
        GetEnvPchar:=Linux.Getenv(envname);
        {$define GETENVOK}
      {$endif}
      {$ifdef win32}
        GetEnvPchar:=nil;
        p:=GetEnvironmentStrings;
        hp:=p;
        while hp^<>#0 do
         begin
           s:=strpas(hp);
           i:=pos('=',s);
           len:=strlen(hp);
           if upcase(copy(s,1,i-1))=upcase(envname) then
            begin
              GetMem(p2,len-length(envname));
              Move(hp[i],p2^,len-length(envname));
              GetEnvPchar:=p2;
              break;
            end;
           { next string entry}
           hp:=hp+len+1;
         end;
        FreeEnvironmentStrings(p);
        {$define GETENVOK}
      {$endif}
      {$ifdef GETENVOK}
        {$undef GETENVOK}
      {$else}
        GetEnvPchar:=StrPNew(Dos.Getenv(envname));
      {$endif}
      end;

    procedure FreeEnvPChar(p:pchar);
      begin
      {$ifndef linux}
        StrDispose(p);
      {$endif}
      end;

    Procedure Shell(const command:string);
      { This is already defined in the linux.ppu for linux, need for the *
        expansion under linux }
      {$ifdef linux}
      begin
        Linux.Shell(command);
      end;
      {$else}
      var
        comspec : string;
      begin
        comspec:=getenv('COMSPEC');
        Exec(comspec,' /C '+command);
      end;
      {$endif}

 {****************************************************************************
                                    Init
 ****************************************************************************}

   procedure get_exepath;
     var
       hs1 : namestr;
       hs2 : extstr;
     begin
{$ifdef delphi}
       exepath:=dmisc.getenv('PPC_EXEC_PATH');
{$else delphi}
       exepath:=dos.getenv('PPC_EXEC_PATH');
{$endif delphi}
       if exepath='' then
        fsplit(FixFileName(paramstr(0)),exepath,hs1,hs2);
     {$ifdef linux}
       if exepath='' then
        fsearch(hs1,dos.getenv('PATH'));
     {$endif}
       exepath:=FixPath(exepath,false);
     end;



   procedure DoneGlobals;
     begin
       initdefines.done;
       if assigned(DLLImageBase) then
         StringDispose(DLLImageBase);
       RelocSection:=true;
       RelocSectionSetExplicitly:=false;
       DLLsource:=false;
       UseDeffileForExport:=true;
       librarysearchpath.Done;
       unitsearchpath.Done;
       objectsearchpath.Done;
       includesearchpath.Done;
     end;

   procedure InitGlobals;
     begin
      { set global switches }
        do_build:=false;
        do_make:=true;
{$ifdef tp}
        use_big:=false;
{$endif tp}
       compile_level:=0;

      { Output }
        OutputFile:='';
        OutputExeDir:='';
        OutputUnitDir:='';

      { Utils directory }
        utilsdirectory:='';

      { Search Paths }
        librarysearchpath.Init;
        unitsearchpath.Init;
        includesearchpath.Init;
        objectsearchpath.Init;

      { Def file }
        usewindowapi:=false;
        description:='Compiled by FPC '+version_string+' - '+target_cpu_string;

      { Init values }
        initmodeswitches:=fpcmodeswitches;
        initlocalswitches:=[cs_check_io];
        initmoduleswitches:=[cs_extsyntax,cs_browser];
        initglobalswitches:=[cs_check_unit_name,cs_link_static];
{$ifdef i386}
        initoptprocessor:=Class386;
        initpackenum:=4;
        initpackrecords:=packrecord_2;
        initoutputformat:=target_asm.id;
        initasmmode:=asmmode_i386_att;
{$else not i386}
  {$ifdef m68k}
        initoptprocessor:=MC68000;
        include(initmoduleswitches,cs_fp_emulation);
        initpackenum:=4;
        initpackrecords:=packrecord_2;
        initoutputformat:=as_m68k_as;
        initasmmode:=asmmode_m68k_mot;
  {$endif m68k}
{$endif i386}
        initdefines.init;

      { memory sizes, will be overriden by parameter or default for target
        in options or init_parser }
        stacksize:=0;
        heapsize:=0;
        maxheapsize:=0;

      { compile state }
        in_args:=false;
        { must_be_valid:=true; obsolete PM }
        not_unit_proc:=true;

        apptype:=at_cui;
     end;

begin
  get_exepath;
{$ifdef EXTDEBUG}
{$ifdef FPC}
  EntryMemUsed:=system.HeapSize-MemAvail;
{$endif FPC}
{$endif}
end.
{
  $Log$
  Revision 1.39  1999-12-08 10:40:00  pierre
    + allow use of unit var in exports of DLL for win32
      by using direct export writing by default instead of use of DEFFILE
      that does not allow assembler labels that do not
      start with an underscore.
      Use -WD to force use of Deffile for Win32 DLL

  Revision 1.38  1999/12/06 18:21:03  peter
    * support !ENVVAR for long commandlines
    * win32/go32v2 write short pathnames to link.res so c:\Program Files\ is
      finally supported as installdir.

  Revision 1.37  1999/12/02 17:34:34  peter
    * preprocessor support. But it fails on the caret in type blocks

  Revision 1.36  1999/11/18 15:34:45  pierre
    * Notes/Hints for local syms changed to
      Set_varstate function

  Revision 1.35  1999/11/17 17:04:59  pierre
   * Notes/hints changes

  Revision 1.34  1999/11/15 17:42:41  pierre
   * -g disables reloc section for win32

  Revision 1.33  1999/11/12 11:03:50  peter
    * searchpaths changed to stringqueue object

  Revision 1.32  1999/11/09 23:34:46  pierre
   + resolving_forward boolean used for references

  Revision 1.31  1999/11/09 13:00:38  peter
    * define FPC_DELPHI,FPC_OBJFPC,FPC_TP,FPC_GPC
    * initial support for ansistring default with modes

  Revision 1.30  1999/11/08 16:27:20  pierre
   + Reset AnsiStrings to clean up memory

  Revision 1.29  1999/11/06 14:34:20  peter
    * truncated log to 20 revs

  Revision 1.28  1999/11/04 10:55:31  peter
    * TSearchPathList for the string type of the searchpaths, which is
      ansistring under FPC/Delphi

  Revision 1.27  1999/10/26 12:30:41  peter
    * const parameter is now checked
    * better and generic check if a node can be used for assigning
    * export fixes
    * procvar equal works now (it never had worked at least from 0.99.8)
    * defcoll changed to linkedlist with pparaitem so it can easily be
      walked both directions

  Revision 1.26  1999/10/21 14:29:34  peter
    * redesigned linker object
    + library support for linux (only procedures can be exported)

  Revision 1.25  1999/09/10 18:48:02  florian
    * some bug fixes (e.g. must_be_valid and procinfo.funcret_is_valid)
    * most things for stored properties fixed

  Revision 1.24  1999/09/08 16:05:31  peter
    * pointer add/sub is now as expected and the same results as inc/dec

  Revision 1.23  1999/09/07 15:11:00  pierre
   * use do_internalerror insetead of runerror

  Revision 1.22  1999/08/30 10:17:56  peter
    * fixed crash in psub
    * ansistringcompare fixed
    * support for #$0b8

  Revision 1.21  1999/08/27 10:45:00  pierre
   options -Ca sets simply_ppu to true

  Revision 1.20  1999/08/19 13:02:12  pierre
    + label faillabel added for _FAIL support

  Revision 1.19  1999/08/16 15:35:21  pierre
    * fix for DLL relocation problems
    * external bss vars had wrong stabs for pecoff
    + -WB11000000 to specify default image base, allows to
      load several DLLs with debugging info included
      (relocatable DLL are stripped because the relocation
       of the .Stab section is misplaced by ldw)

  Revision 1.18  1999/08/11 17:26:32  peter
    * tlinker object is now inherited for win32 and dos
    * postprocessexecutable is now a method of tlinker

  Revision 1.17  1999/08/10 12:51:14  pierre
    * bind_win32_dll removed (Relocsection used instead)
    * now relocsection is true by default ! (needs dlltool
      for DLL generation)

  Revision 1.16  1999/08/05 20:54:19  daniel
  * Changes for new symtable.

  Revision 1.15  1999/08/03 17:09:35  florian
    * the alpha compiler can be compiled now

  Revision 1.14  1999/07/23 16:05:19  peter
    * alignment is now saved in the symtable
    * C alignment added for records
    * PPU version increased to solve .12 <-> .13 probs

  Revision 1.13  1999/07/18 10:19:52  florian
    * made it compilable with Dlephi 4 again
    + fixed problem with large stack allocations on win32

  Revision 1.12  1999/07/13 19:14:44  michael
  + Defaultreplacemens now more logical

  Revision 1.11  1999/07/10 10:26:18  peter
    * merged

  Revision 1.8.2.2  1999/07/10 10:03:04  peter
    * fixed initialization/finalization in fpc mode
    * allow $TARGET also in search paths

  Revision 1.8.2.1  1999/07/07 07:53:21  michael
  + Merged patches from florian

}