fpc/compiler/cutils.pas

{
    $Id$
    Copyright (C) 1998-2000 by Florian Klaempfl

    This unit implements some support functions

    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.

 ****************************************************************************
}
unit cutils;

{$i defines.inc}

interface

{$ifdef delphi}
    type
       dword = cardinal;
       qword = int64;
{$endif}

    type
       pstring = ^string;

    function min(a,b : longint) : longint;
    function max(a,b : longint) : longint;
    function align(i,a:longint):longint;
    function used_align(varalign,minalign,maxalign:longint):longint;
    function size_2_align(len : 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 trimbspace(const s:string):string;
    function trimspace(const s:string):string;
    function GetToken(var s:string;endchar:char):string;
    procedure uppervar(var s : string);
    function hexstr(val : cardinal;cnt : byte) : string;
    function tostru(i:cardinal) : string;
    function tostr(i : longint) : string;
    function int64tostr(i : int64) : 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;
    function maybequoted(const s:string):string;

    { releases the string p and assignes nil to p }
    { if p=nil then freemem isn't called          }
    procedure stringdispose(var p : pstring);


    { allocates mem for a copy of s, copies s to this mem and returns }
    { a pointer to this mem                                           }
    function stringdup(const s : string) : pstring;

    { allocates memory for s and copies s as zero terminated string
      to that mem and returns a pointer to that mem }
    function  strpnew(const s : string) : pchar;
    procedure strdispose(var p : pchar);

    { makes a char lowercase, with spanish, french and german char set }
    function lowercase(c : char) : char;

    { makes zero terminated string to a pascal string }
    { the data in p is modified and p is returned     }
    function pchar2pstring(p : pchar) : pstring;

    { ambivalent to pchar2pstring }
    function pstring2pchar(p : pstring) : pchar;

{ Speed/Hash value }
function getspeedvalue(const s : string) : longint;

{ Ansistring (pchar+length) support }
procedure ansistringdispose(var p : pchar;length : longint);
function compareansistrings(p1,p2 : pchar;length1,length2 : longint) : longint;
function concatansistrings(p1,p2 : pchar;length1,length2 : longint) : pchar;

{*****************************************************************************
                                 File Functions
*****************************************************************************}

    function DeleteFile(const fn:string):boolean;


implementation

uses
{$ifdef delphi}
  sysutils
{$else}
  strings
{$endif}
  ;

    var
      uppertbl,
      lowertbl  : array[char] of char;


    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
        { for 0 and 1 no aligning is needed }
        if a<=1 then
         align:=i
        else
         align:=((i+a-1) div a) * a;
      end;


    function size_2_align(len : longint) : longint;
      begin
         if len>16 then
           size_2_align:=32
         else if len>8 then
           size_2_align:=16
         else if len>4 then
           size_2_align:=8
         else if len>2 then
           size_2_align:=4
         else if len>1 then
           size_2_align:=2
         else
           size_2_align:=1;
      end;


    function used_align(varalign,minalign,maxalign:longint):longint;
      begin
        { varalign  : minimum alignment required for the variable
          minalign  : Minimum alignment of this structure, 0 = undefined
          maxalign  : Maximum alignment of this structure, 0 = undefined }
        if (minalign>0) and
           (varalign<minalign) then
         used_align:=minalign
        else
         begin
           if (maxalign>0) and
              (varalign>maxalign) then
            used_align:=maxalign
           else
            used_align:=varalign;
         end;
      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
          upper[i]:=uppertbl[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
          lower[i]:=lowertbl[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
          s[i]:=uppertbl[s[i]];
      end;


    procedure initupperlower;
      var
        c : char;
      begin
        for c:=#0 to #255 do
         begin
           lowertbl[c]:=c;
           uppertbl[c]:=c;
           case c of
             'A'..'Z' :
               lowertbl[c]:=char(byte(c)+32);
             'a'..'z' :
               uppertbl[c]:=char(byte(c)-32);
           end;
         end;
      end;


    function hexstr(val : cardinal;cnt : byte) : string;
      const
        HexTbl : array[0..15] of char='0123456789ABCDEF';
      var
        i : longint;
      begin
        hexstr[0]:=char(cnt);
        for i:=cnt downto 1 do
         begin
           hexstr[i]:=hextbl[val and $f];
           val:=val shr 4;
         end;
      end;


   function tostru(i:cardinal):string;
   {
     return string of value i, but for cardinals
   }
      var
        hs : string;
      begin
        str(i,hs);
        tostru:=hs;
      end;


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



   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 GetToken(var s:string;endchar:char):string;
      var
        i : longint;
      begin
        s:=TrimSpace(s);
        i:=pos(EndChar,s);
        if i=0 then
         begin
           GetToken:=s;
           s:='';
         end
        else
         begin
           GetToken:=Copy(s,1,i-1);
           Delete(s,1,i);
         end;
      end;


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


   function int64tostr(i : int64) : string;
   {
     return string of value i
   }
     var
        hs : string;
     begin
        str(i,hs);
        int64tostr:=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;


    function maybequoted(const s:string):string;
      var
        s1 : string;
        i  : integer;
      begin
        if (pos('"',s)>0) then
         begin
           s1:='"';
           for i:=1 to length(s) do
            begin
              if s[i]='"' then
               s1:=s1+'\"'
              else
               s1:=s1+s[i];
            end;
           maybequoted:=s1+'"';
         end
        else if (pos(' ',s)>0) then
         maybequoted:='"'+s+'"'
        else
         maybequoted:=s;
      end;


    function pchar2pstring(p : pchar) : pstring;
      var
         w,i : longint;
      begin
         w:=strlen(p);
         for i:=w-1 downto 0 do
           p[i+1]:=p[i];
         p[0]:=chr(w);
         pchar2pstring:=pstring(p);
      end;


    function pstring2pchar(p : pstring) : pchar;
      var
         w,i : longint;
      begin
         w:=length(p^);
         for i:=1 to w do
           p^[i-1]:=p^[i];
         p^[w]:=#0;
         pstring2pchar:=pchar(p);
      end;


    function lowercase(c : char) : char;
       begin
          case c of
             #65..#90 : c := chr(ord (c) + 32);
             #154 : c:=#129;  { german }
             #142 : c:=#132;  { german }
             #153 : c:=#148;  { german }
             #144 : c:=#130;  { french }
             #128 : c:=#135;  { french }
             #143 : c:=#134;  { swedish/norge (?) }
             #165 : c:=#164;  { spanish }
             #228 : c:=#229;  { greek }
             #226 : c:=#231;  { greek }
             #232 : c:=#227;  { greek }
          end;
          lowercase := c;
       end;


    function strpnew(const s : string) : pchar;
      var
         p : pchar;
      begin
         getmem(p,length(s)+1);
         strpcopy(p,s);
         strpnew:=p;
      end;


    procedure strdispose(var p : pchar);
      begin
        if assigned(p) then
         begin
           freemem(p,strlen(p)+1);
           p:=nil;
         end;
      end;


    procedure stringdispose(var p : pstring);
      begin
         if assigned(p) then
           freemem(p,length(p^)+1);
         p:=nil;
      end;


    function stringdup(const s : string) : pstring;
      var
         p : pstring;
      begin
         getmem(p,length(s)+1);
         p^:=s;
         stringdup:=p;
      end;



{*****************************************************************************
                               GetSpeedValue
*****************************************************************************}

var
  Crc32Tbl : array[0..255] of longint;

procedure MakeCRC32Tbl;
var
  crc : longint;
  i,n : byte;
begin
  for i:=0 to 255 do
   begin
     crc:=i;
     for n:=1 to 8 do
      if odd(crc) then
       crc:=(crc shr 1) xor longint($edb88320)
      else
       crc:=crc shr 1;
     Crc32Tbl[i]:=crc;
   end;
end;


{$ifopt R+}
  {$define Range_check_on}
{$endif opt R+}

{$R- needed here }
{CRC 32}
Function GetSpeedValue(Const s:String):longint;
var
  i,InitCrc : longint;
begin
  if Crc32Tbl[1]=0 then
   MakeCrc32Tbl;
  InitCrc:=-1;
  for i:=1 to Length(s) do
   InitCrc:=Crc32Tbl[byte(InitCrc) xor ord(s[i])] xor (InitCrc shr 8);
  GetSpeedValue:=InitCrc;
end;

{$ifdef Range_check_on}
  {$R+}
  {$undef Range_check_on}
{$endif Range_check_on}


{*****************************************************************************
                               Ansistring (PChar+Length)
*****************************************************************************}

    procedure ansistringdispose(var p : pchar;length : longint);
      begin
         if assigned(p) then
           freemem(p,length+1);
         p:=nil;
      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;


{*****************************************************************************
                                 File Functions
*****************************************************************************}

    function DeleteFile(const fn:string):boolean;
      var
        f : file;
      begin
        {$I-}
         assign(f,fn);
         erase(f);
        {$I-}
        DeleteFile:=(IOResult=0);
      end;


initialization
  initupperlower;
end.
{
  $Log$
  Revision 1.8  2001-07-01 20:16:15  peter
    * alignmentinfo record added
    * -Oa argument supports more alignment settings that can be specified
      per type: PROC,LOOP,VARMIN,VARMAX,CONSTMIN,CONSTMAX,RECORDMIN
      RECORDMAX,LOCALMIN,LOCALMAX. It is possible to set the mimimum
      required alignment and the maximum usefull alignment. The final
      alignment will be choosen per variable size dependent on these
      settings

  Revision 1.7  2001/06/18 20:36:23  peter
    * -Ur switch (merged)
    * masm fixes (merged)
    * quoted filenames for go32v2 and win32

  Revision 1.6  2001/05/09 14:11:10  jonas
    * range check error fixes from Peter

  Revision 1.5  2000/12/24 12:25:31  peter
    + cstreams unit
    * dynamicarray object to class

  Revision 1.4  2000/11/28 00:17:43  pierre
   + int64tostr function added

  Revision 1.3  2000/11/07 20:47:35  peter
    * use tables for upper/lower

  Revision 1.2  2000/09/24 15:06:14  peter
    * use defines.inc

  Revision 1.1  2000/08/27 16:11:50  peter
    * moved some util functions from globals,cobjects to cutils
    * splitted files into finput,fmodule

}