gcc/ada/libgnat/a-ztfiau.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --        A D A . W I D E _ W I D E _ T E X T _ I O . F I X E D _ I O       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --            Copyright (C) 2020-2023, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with Ada.Wide_Wide_Text_IO.Generic_Aux; use Ada.Wide_Wide_Text_IO.Generic_Aux;
  33
  34 package body Ada.Wide_Wide_Text_IO.Fixed_Aux is
  35
  36    ---------
  37    -- Get --
  38    ---------
  39
  40    function Get
  41      (File  : File_Type;
  42       Width : Field;
  43       Num   : Int;
  44       Den   : Int) return Int
  45    is
  46       Buf  : String (1 .. Field'Last);
  47       Ptr  : aliased Integer;
  48       Stop : Integer := 0;
  49       Item : Int;
  50
  51    begin
  52       if Width /= 0 then
  53          Load_Width (File, Width, Buf, Stop);
  54          String_Skip (Buf, Ptr);
  55       else
  56          Load_Real (File, Buf, Stop);
  57          Ptr := 1;
  58       end if;
  59
  60       Item := Scan (Buf, Ptr'Access, Stop, Num, Den);
  61       Check_End_Of_Field (Buf, Stop, Ptr, Width);
  62       return Item;
  63    end Get;
  64
  65    ----------
  66    -- Gets --
  67    ----------
  68
  69    function Gets
  70      (From : String;
  71       Last : out Positive;
  72       Num  : Int;
  73       Den  : Int) return Int
  74    is
  75       Pos  : aliased Integer;
  76       Item : Int;
  77
  78    begin
  79       String_Skip (From, Pos);
  80       Item := Scan (From, Pos'Access, From'Last, Num, Den);
  81       Last := Pos - 1;
  82       return Item;
  83
  84    exception
  85       when Constraint_Error =>
  86          Last := Pos - 1;
  87          raise Data_Error;
  88    end Gets;
  89
  90    ---------
  91    -- Put --
  92    ---------
  93
  94    procedure Put
  95      (File : File_Type;
  96       Item : Int;
  97       Fore : Field;
  98       Aft  : Field;
  99       Exp  : Natural;
 100       Num  : Int;
 101       Den  : Int;
 102       For0 : Natural;
 103       Aft0 : Natural)
 104    is
 105       Buf : String (1 .. Field'Last);
 106       Ptr : Natural := 0;
 107
 108    begin
 109       Set_Image (Item, Buf, Ptr, Num, Den, For0, Aft0, Fore, Aft, Exp);
 110       Put_Item (File, Buf (1 .. Ptr));
 111    end Put;
 112
 113    ----------
 114    -- Puts --
 115    ----------
 116
 117    procedure Puts
 118      (To   : out String;
 119       Item : Int;
 120       Aft  : Field;
 121       Exp  : Natural;
 122       Num  : Int;
 123       Den  : Int;
 124       For0 : Natural;
 125       Aft0 : Natural)
 126    is
 127       Buf  : String (1 .. Positive'Max (Field'Last, To'Length));
 128       Fore : Integer;
 129       Ptr  : Natural := 0;
 130
 131    begin
 132       --  Compute Fore, allowing for the decimal dot and Aft digits
 133
 134       Fore := To'Length - 1 - Field'Max (1, Aft);
 135
 136       --  Allow for Exp and one more for E if exponent present
 137
 138       if Exp /= 0 then
 139          Fore := Fore - 1 - Field'Max (2, Exp);
 140       end if;
 141
 142       --  Make sure we have enough room
 143
 144       if Fore < 1 + Boolean'Pos (Item < 0) then
 145          raise Layout_Error;
 146       end if;
 147
 148       --  Do the conversion and check length of result
 149
 150       Set_Image (Item, Buf, Ptr, Num, Den, For0, Aft0, Fore, Aft, Exp);
 151
 152       if Ptr > To'Length then
 153          raise Layout_Error;
 154       else
 155          To := Buf (1 .. Ptr);
 156       end if;
 157    end Puts;
 158
 159 end Ada.Wide_Wide_Text_IO.Fixed_Aux;