gcc/ada/libgnat/a-tideau.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --              A D A . T E X T _ I O . D E C I M A L _ A U X               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2023, Free Software Foundation, Inc.         --
  10 --                                                                          --
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  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- --
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  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.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
  33
  34 package body Ada.Text_IO.Decimal_Aux is
  35
  36    ---------
  37    -- Get --
  38    ---------
  39
  40    function Get
  41      (File  : File_Type;
  42       Width : Field;
  43       Scale : Integer) return Int
  44    is
  45       Buf  : String (1 .. Field'Last);
  46       Ptr  : aliased Integer;
  47       Stop : Integer := 0;
  48       Item : Int;
  49
  50    begin
  51       if Width /= 0 then
  52          Load_Width (File, Width, Buf, Stop);
  53          String_Skip (Buf, Ptr);
  54       else
  55          Load_Real (File, Buf, Stop);
  56          Ptr := 1;
  57       end if;
  58
  59       Item := Scan (Buf, Ptr'Access, Stop, Scale);
  60       Check_End_Of_Field (Buf, Stop, Ptr, Width);
  61       return Item;
  62    end Get;
  63
  64    ----------
  65    -- Gets --
  66    ----------
  67
  68    function Gets
  69      (From  : String;
  70       Last  : out Positive;
  71       Scale : Integer) return Int
  72    is
  73       Pos  : aliased Integer;
  74       Item : Int;
  75
  76    begin
  77       String_Skip (From, Pos);
  78       Item := Scan (From, Pos'Access, From'Last, Scale);
  79       Last := Pos - 1;
  80       return Item;
  81
  82    exception
  83       when Constraint_Error =>
  84          Last := Pos - 1;
  85          raise Data_Error;
  86    end Gets;
  87
  88    ---------
  89    -- Put --
  90    ---------
  91
  92    procedure Put
  93      (File  : File_Type;
  94       Item  : Int;
  95       Fore  : Field;
  96       Aft   : Field;
  97       Exp   : Field;
  98       Scale : Integer)
  99    is
 100       Buf : String (1 .. Field'Last);
 101       Ptr : Natural := 0;
 102
 103    begin
 104       Set_Image (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
 105       Put_Item (File, Buf (1 .. Ptr));
 106    end Put;
 107
 108    ----------
 109    -- Puts --
 110    ----------
 111
 112    procedure Puts
 113      (To    : out String;
 114       Item  : Int;
 115       Aft   : Field;
 116       Exp   : Field;
 117       Scale : Integer)
 118    is
 119       Buf  : String (1 .. Positive'Max (Field'Last, To'Length));
 120       Fore : Integer;
 121       Ptr  : Natural := 0;
 122
 123    begin
 124       --  Compute Fore, allowing for the decimal dot and Aft digits
 125
 126       Fore := To'Length - 1 - Field'Max (1, Aft);
 127
 128       --  Allow for Exp and one more for E if exponent present
 129
 130       if Exp /= 0 then
 131          Fore := Fore - 1 - Field'Max (2, Exp);
 132       end if;
 133
 134       --  Make sure we have enough room
 135
 136       if Fore < 1 + Boolean'Pos (Item < 0) then
 137          raise Layout_Error;
 138       end if;
 139
 140       --  Do the conversion and check length of result
 141
 142       Set_Image (Item, Buf, Ptr, Scale, Fore, Aft, Exp);
 143
 144       if Ptr > To'Length then
 145          raise Layout_Error;
 146       else
 147          To := Buf (1 .. Ptr);
 148       end if;
 149    end Puts;
 150
 151 end Ada.Text_IO.Decimal_Aux;