gcc/ada/s-wwdenu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                      S Y S T E M . W W D _ E N U M                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1 $
  10 --                                                                          --
  11 --          Copyright (C) 1992-2000 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.WCh_StW; use System.WCh_StW;
  37 with System.WCh_Con; use System.WCh_Con;
  38
  39 with Unchecked_Conversion;
  40
  41 package body System.WWd_Enum is
  42
  43    ------------------------------
  44    -- Wide_Width_Enumeration_8 --
  45    ------------------------------
  46
  47    function Wide_Width_Enumeration_8
  48      (Names   : String;
  49       Indexes : System.Address;
  50       Lo, Hi  : Natural;
  51       EM      : WC_Encoding_Method)
  52       return    Natural
  53    is
  54       W : Natural;
  55
  56       type Natural_8 is range 0 .. 2 ** 7 - 1;
  57       type Index_Table is array (Natural) of Natural_8;
  58       type Index_Table_Ptr is access Index_Table;
  59
  60       function To_Index_Table_Ptr is
  61         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  62
  63       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  64
  65    begin
  66       W := 0;
  67
  68       for J in Lo .. Hi loop
  69          declare
  70             WS : constant Wide_String :=
  71               String_To_Wide_String
  72                 (Names (Natural (IndexesT (J)) ..
  73                         Natural (IndexesT (J + 1)) - 1), EM);
  74
  75          begin
  76             W := Natural'Max (W, WS'Length);
  77          end;
  78       end loop;
  79
  80       return W;
  81    end Wide_Width_Enumeration_8;
  82
  83    -------------------------------
  84    -- Wide_Width_Enumeration_16 --
  85    -------------------------------
  86
  87    function Wide_Width_Enumeration_16
  88      (Names   : String;
  89       Indexes : System.Address;
  90       Lo, Hi  : Natural;
  91       EM      : WC_Encoding_Method)
  92       return    Natural
  93    is
  94       W : Natural;
  95
  96       type Natural_16 is range 0 .. 2 ** 15 - 1;
  97       type Index_Table is array (Natural) of Natural_16;
  98       type Index_Table_Ptr is access Index_Table;
  99
 100       function To_Index_Table_Ptr is
 101         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
 102
 103       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 104
 105    begin
 106       W := 0;
 107
 108       for J in Lo .. Hi loop
 109          declare
 110             WS : constant Wide_String :=
 111               String_To_Wide_String
 112                 (Names (Natural (IndexesT (J)) ..
 113                         Natural (IndexesT (J + 1)) - 1), EM);
 114
 115          begin
 116             W := Natural'Max (W, WS'Length);
 117          end;
 118       end loop;
 119
 120       return W;
 121    end Wide_Width_Enumeration_16;
 122
 123    -------------------------------
 124    -- Wide_Width_Enumeration_32 --
 125    -------------------------------
 126
 127    function Wide_Width_Enumeration_32
 128      (Names   : String;
 129       Indexes : System.Address;
 130       Lo, Hi  : Natural;
 131       EM      : WC_Encoding_Method)
 132       return    Natural
 133    is
 134       W : Natural;
 135
 136       type Natural_32 is range 0 .. 2 ** 31 - 1;
 137       type Index_Table is array (Natural) of Natural_32;
 138       type Index_Table_Ptr is access Index_Table;
 139
 140       function To_Index_Table_Ptr is
 141         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
 142
 143       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 144
 145    begin
 146       W := 0;
 147
 148       for J in Lo .. Hi loop
 149          declare
 150             WS : constant Wide_String :=
 151               String_To_Wide_String
 152                 (Names (Natural (IndexesT (J)) ..
 153                         Natural (IndexesT (J + 1)) - 1), EM);
 154
 155          begin
 156             W := Natural'Max (W, WS'Length);
 157          end;
 158       end loop;
 159
 160       return W;
 161    end Wide_Width_Enumeration_32;
 162
 163 end System.WWd_Enum;