gcc/ada/a-tiflau.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                A D A . T E X T _ I O . F L O A T _ A U X                 --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2007, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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.Text_IO.Generic_Aux; use Ada.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.Text_IO.Float_Aux is
  40
  41    ---------
  42    -- Get --
  43    ---------
  44
  45    procedure Get
  46      (File  : File_Type;
  47       Item  : out Long_Long_Float;
  48       Width : 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 : 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          raise Data_Error;
  86    end Gets;
  87
  88    ---------------
  89    -- Load_Real --
  90    ---------------
  91
  92    procedure Load_Real
  93      (File : File_Type;
  94       Buf  : out String;
  95       Ptr  : in out Natural)
  96    is
  97       Loaded   : Boolean;
  98
  99    begin
 100       --  Skip initial blanks, and load possible sign
 101
 102       Load_Skip (File);
 103       Load (File, Buf, Ptr, '+', '-');
 104
 105       --  Case of .nnnn
 106
 107       Load (File, Buf, Ptr, '.', Loaded);
 108
 109       if Loaded then
 110          Load_Digits (File, Buf, Ptr, Loaded);
 111
 112          --  Hopeless junk if no digits loaded
 113
 114          if not Loaded then
 115             return;
 116          end if;
 117
 118       --  Otherwise must have digits to start
 119
 120       else
 121          Load_Digits (File, Buf, Ptr, Loaded);
 122
 123          --  Hopeless junk if no digits loaded
 124
 125          if not Loaded then
 126             return;
 127          end if;
 128
 129          --  Based cases
 130
 131          Load (File, Buf, Ptr, '#', ':', Loaded);
 132
 133          if Loaded then
 134
 135             --  Case of nnn#.xxx#
 136
 137             Load (File, Buf, Ptr, '.', Loaded);
 138
 139             if Loaded then
 140                Load_Extended_Digits (File, Buf, Ptr);
 141                Load (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             --  Prevent the potential processing of '.' in cases where the
 163             --  initial digits have a trailing underscore.
 164
 165             if Buf (Ptr) = '_' then
 166                return;
 167             end if;
 168
 169             Load (File, Buf, Ptr, '.', Loaded);
 170
 171             if Loaded then
 172                Load_Digits (File, Buf, Ptr);
 173             end if;
 174          end if;
 175       end if;
 176
 177       --  Deal with exponent
 178
 179       Load (File, Buf, Ptr, 'E', 'e', Loaded);
 180
 181       if Loaded then
 182          Load (File, Buf, Ptr, '+', '-');
 183          Load_Digits (File, Buf, Ptr);
 184       end if;
 185    end Load_Real;
 186
 187    ---------
 188    -- Put --
 189    ---------
 190
 191    procedure Put
 192      (File : File_Type;
 193       Item : Long_Long_Float;
 194       Fore : Field;
 195       Aft  : Field;
 196       Exp  : Field)
 197    is
 198       Buf : String (1 .. 3 * Field'Last + 2);
 199       Ptr : Natural := 0;
 200
 201    begin
 202       Set_Image_Real (Item, Buf, Ptr, Fore, Aft, Exp);
 203       Put_Item (File, Buf (1 .. Ptr));
 204    end Put;
 205
 206    ----------
 207    -- Puts --
 208    ----------
 209
 210    procedure Puts
 211      (To   : out String;
 212       Item : Long_Long_Float;
 213       Aft  : Field;
 214       Exp  : Field)
 215    is
 216       Buf : String (1 .. 3 * Field'Last + 2);
 217       Ptr : Natural := 0;
 218
 219    begin
 220       Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => Exp);
 221
 222       if Ptr > To'Length then
 223          raise Layout_Error;
 224
 225       else
 226          for J in 1 .. Ptr loop
 227             To (To'Last - Ptr + J) := Buf (J);
 228          end loop;
 229
 230          for J in To'First .. To'Last - Ptr loop
 231             To (J) := ' ';
 232          end loop;
 233       end if;
 234    end Puts;
 235
 236 end Ada.Text_IO.Float_Aux;