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