gcc/ada/a-wtflau.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --           A D A . W I D E _ T E X T _ I O . F L O A T _ A U X            --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2001 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- --
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  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 --
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  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 Ada.Wide_Text_IO.Generic_Aux; use Ada.Wide_Text_IO.Generic_Aux;
  35
  36 with System.Img_Real;  use System.Img_Real;
  37 with System.Val_Real;  use System.Val_Real;
  38
  39 package body Ada.Wide_Text_IO.Float_Aux is
  40
  41    ---------
  42    -- Get --
  43    ---------
  44
  45    procedure Get
  46      (File  : in File_Type;
  47       Item  : out Long_Long_Float;
  48       Width : in Field)
  49    is
  50       Buf  : String (1 .. Field'Last);
  51       Stop : Integer := 0;
  52       Ptr  : aliased Integer := 1;
  53
  54    begin
  55       if Width /= 0 then
  56          Load_Width (File, Width, Buf, Stop);
  57          String_Skip (Buf, Ptr);
  58       else
  59          Load_Real (File, Buf, Stop);
  60       end if;
  61
  62       Item := Scan_Real (Buf, Ptr'Access, Stop);
  63
  64       Check_End_Of_Field (Buf, Stop, Ptr, Width);
  65    end Get;
  66
  67    ----------
  68    -- Gets --
  69    ----------
  70
  71    procedure Gets
  72      (From : in String;
  73       Item : out Long_Long_Float;
  74       Last : out Positive)
  75    is
  76       Pos : aliased Integer;
  77
  78    begin
  79       String_Skip (From, Pos);
  80       Item := Scan_Real (From, Pos'Access, From'Last);
  81       Last := Pos - 1;
  82
  83    exception
  84       when Constraint_Error =>
  85          Last := Pos - 1;
  86          raise Data_Error;
  87    end Gets;
  88
  89    ---------------
  90    -- Load_Real --
  91    ---------------
  92
  93    procedure Load_Real
  94      (File : in File_Type;
  95       Buf  : out String;
  96       Ptr  : in out Natural)
  97    is
  98       Loaded   : Boolean;
  99
 100    begin
 101       --  Skip initial blanks and load possible sign
 102
 103       Load_Skip (File);
 104       Load (File, Buf, Ptr, '+', '-');
 105
 106       --  Case of .nnnn
 107
 108       Load (File, Buf, Ptr, '.', Loaded);
 109
 110       if Loaded then
 111          Load_Digits (File, Buf, Ptr, Loaded);
 112
 113          --  Hopeless junk if no digits loaded
 114
 115          if not Loaded then
 116             return;
 117          end if;
 118
 119       --  Otherwise must have digits to start
 120
 121       else
 122          Load_Digits (File, Buf, Ptr, Loaded);
 123
 124          --  Hopeless junk if no digits loaded
 125
 126          if not Loaded then
 127             return;
 128          end if;
 129
 130          --  Based cases
 131
 132          Load (File, Buf, Ptr, '#', ':', Loaded);
 133
 134          if Loaded then
 135
 136             --  Case of nnn#.xxx#
 137
 138             Load (File, Buf, Ptr, '.', Loaded);
 139
 140             if Loaded then
 141                Load_Extended_Digits (File, Buf, Ptr);
 142
 143             --  Case of nnn#xxx.[xxx]# or nnn#xxx#
 144
 145             else
 146                Load_Extended_Digits (File, Buf, Ptr);
 147                Load (File, Buf, Ptr, '.', Loaded);
 148
 149                if Loaded then
 150                   Load_Extended_Digits (File, Buf, Ptr);
 151                end if;
 152
 153                --  As usual, it seems strange to allow mixed base characters,
 154                --  but that is what ACVC tests expect, see CE3804M, case (3).
 155
 156                Load (File, Buf, Ptr, '#', ':');
 157             end if;
 158
 159          --  Case of nnn.[nnn] or nnn
 160
 161          else
 162             Load (File, Buf, Ptr, '.', Loaded);
 163
 164             if Loaded then
 165                Load_Digits (File, Buf, Ptr);
 166             end if;
 167          end if;
 168       end if;
 169
 170       --  Deal with exponent
 171
 172       Load (File, Buf, Ptr, 'E', 'e', Loaded);
 173
 174       if Loaded then
 175          Load (File, Buf, Ptr, '+', '-');
 176          Load_Digits (File, Buf, Ptr);
 177       end if;
 178    end Load_Real;
 179
 180    ---------
 181    -- Put --
 182    ---------
 183
 184    procedure Put
 185      (File : in File_Type;
 186       Item : in Long_Long_Float;
 187       Fore : in Field;
 188       Aft  : in Field;
 189       Exp  : in Field)
 190    is
 191       Buf : String (1 .. Field'Last);
 192       Ptr : Natural := 0;
 193
 194    begin
 195       Set_Image_Real (Item, Buf, Ptr, Fore, Aft, Exp);
 196       Put_Item (File, Buf (1 .. Ptr));
 197    end Put;
 198
 199    ----------
 200    -- Puts --
 201    ----------
 202
 203    procedure Puts
 204      (To   : out String;
 205       Item : in Long_Long_Float;
 206       Aft  : in Field;
 207       Exp  : in Field)
 208    is
 209       Buf    : String (1 .. Field'Last);
 210       Ptr    : Natural := 0;
 211
 212    begin
 213       Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => Exp);
 214
 215       if Ptr > To'Length then
 216          raise Layout_Error;
 217
 218       else
 219          for J in 1 .. Ptr loop
 220             To (To'Last - Ptr + J) := Buf (J);
 221          end loop;
 222
 223          for J in To'First .. To'Last - Ptr loop
 224             To (J) := ' ';
 225          end loop;
 226       end if;
 227    end Puts;
 228
 229 end Ada.Wide_Text_IO.Float_Aux;