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