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 --                            $Revision: 1.16 $                             --
  10 --                                                                          --
  11 --          Copyright (C) 1992-1998 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 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
  37
  38 with System.Img_Real;  use System.Img_Real;
  39 with System.Val_Real;  use System.Val_Real;
  40
  41 package body Ada.Text_IO.Float_Aux is
  42
  43    ---------
  44    -- Get --
  45    ---------
  46
  47    procedure Get
  48      (File  : in File_Type;
  49       Item  : out Long_Long_Float;
  50       Width : in Field)
  51    is
  52       Buf  : String (1 .. Field'Last);
  53       Stop : Integer := 0;
  54       Ptr  : aliased Integer := 1;
  55
  56    begin
  57       if Width /= 0 then
  58          Load_Width (File, Width, Buf, Stop);
  59          String_Skip (Buf, Ptr);
  60       else
  61          Load_Real (File, Buf, Stop);
  62       end if;
  63
  64       Item := Scan_Real (Buf, Ptr'Access, Stop);
  65
  66       Check_End_Of_Field (File, Buf, Stop, Ptr, Width);
  67    end Get;
  68
  69    ----------
  70    -- Gets --
  71    ----------
  72
  73    procedure Gets
  74      (From : in String;
  75       Item : out Long_Long_Float;
  76       Last : out Positive)
  77    is
  78       Pos : aliased Integer;
  79
  80    begin
  81       String_Skip (From, Pos);
  82       Item := Scan_Real (From, Pos'Access, From'Last);
  83       Last := Pos - 1;
  84
  85    exception
  86       when Constraint_Error =>
  87          Last := Pos - 1;
  88          raise Data_Error;
  89    end Gets;
  90
  91    ---------------
  92    -- Load_Real --
  93    ---------------
  94
  95    procedure Load_Real
  96      (File : in File_Type;
  97       Buf  : out String;
  98       Ptr  : in out Natural)
  99    is
 100       Loaded   : Boolean;
 101
 102    begin
 103       --  Skip initial blanks, and load possible sign
 104
 105       Load_Skip (File);
 106       Load (File, Buf, Ptr, '+', '-');
 107
 108       --  Case of .nnnn
 109
 110       Load (File, Buf, Ptr, '.', Loaded);
 111
 112       if Loaded then
 113          Load_Digits (File, Buf, Ptr, Loaded);
 114
 115          --  Hopeless junk if no digits loaded
 116
 117          if not Loaded then
 118             return;
 119          end if;
 120
 121       --  Otherwise must have digits to start
 122
 123       else
 124          Load_Digits (File, Buf, Ptr, Loaded);
 125
 126          --  Hopeless junk if no digits loaded
 127
 128          if not Loaded then
 129             return;
 130          end if;
 131
 132          --  Based cases
 133
 134          Load (File, Buf, Ptr, '#', ':', Loaded);
 135
 136          if Loaded then
 137
 138             --  Case of nnn#.xxx#
 139
 140             Load (File, Buf, Ptr, '.', Loaded);
 141
 142             if Loaded then
 143                Load_Extended_Digits (File, Buf, Ptr);
 144
 145             --  Case of nnn#xxx.[xxx]# or nnn#xxx#
 146
 147             else
 148                Load_Extended_Digits (File, Buf, Ptr);
 149                Load (File, Buf, Ptr, '.', Loaded);
 150
 151                if Loaded then
 152                   Load_Extended_Digits (File, Buf, Ptr);
 153                end if;
 154
 155                --  As usual, it seems strange to allow mixed base characters,
 156                --  but that is what ACVC tests expect, see CE3804M, case (3).
 157
 158                Load (File, Buf, Ptr, '#', ':');
 159             end if;
 160
 161          --  Case of nnn.[nnn] or nnn
 162
 163          else
 164             Load (File, Buf, Ptr, '.', Loaded);
 165
 166             if Loaded then
 167                Load_Digits (File, Buf, Ptr);
 168             end if;
 169          end if;
 170       end if;
 171
 172       --  Deal with exponent
 173
 174       Load (File, Buf, Ptr, 'E', 'e', Loaded);
 175
 176       if Loaded then
 177          Load (File, Buf, Ptr, '+', '-');
 178          Load_Digits (File, Buf, Ptr);
 179       end if;
 180    end Load_Real;
 181
 182    ---------
 183    -- Put --
 184    ---------
 185
 186    procedure Put
 187      (File : in File_Type;
 188       Item : in Long_Long_Float;
 189       Fore : in Field;
 190       Aft  : in Field;
 191       Exp  : in Field)
 192    is
 193       Buf : String (1 .. 3 * Field'Last + 2);
 194       Ptr : Natural := 0;
 195
 196    begin
 197       Set_Image_Real (Item, Buf, Ptr, Fore, Aft, Exp);
 198       Put_Item (File, Buf (1 .. Ptr));
 199    end Put;
 200
 201    ----------
 202    -- Puts --
 203    ----------
 204
 205    procedure Puts
 206      (To   : out String;
 207       Item : in Long_Long_Float;
 208       Aft  : in Field;
 209       Exp  : in Field)
 210    is
 211       Buf : String (1 .. 3 * Field'Last + 2);
 212       Ptr : Natural := 0;
 213
 214    begin
 215       Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => Exp);
 216
 217       if Ptr > To'Length then
 218          raise Layout_Error;
 219
 220       else
 221          for J in 1 .. Ptr loop
 222             To (To'Last - Ptr + J) := Buf (J);
 223          end loop;
 224
 225          for J in To'First .. To'Last - Ptr loop
 226             To (J) := ' ';
 227          end loop;
 228       end if;
 229    end Puts;
 230
 231 end Ada.Text_IO.Float_Aux;