327 lines
13 KiB
Ada
327 lines
13 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . W I D E _ T E X T _ I O . F I X E D _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2020, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Interfaces;
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with Ada.Wide_Text_IO.Fixed_Aux;
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with Ada.Wide_Text_IO.Float_Aux;
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with System.Img_Fixed_32; use System.Img_Fixed_32;
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with System.Img_Fixed_64; use System.Img_Fixed_64;
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with System.Img_Fixed_128; use System.Img_Fixed_128;
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with System.Val_Fixed_32; use System.Val_Fixed_32;
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with System.Val_Fixed_64; use System.Val_Fixed_64;
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with System.Val_Fixed_128; use System.Val_Fixed_128;
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with System.Val_LLF; use System.Val_LLF;
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with System.WCh_Con; use System.WCh_Con;
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with System.WCh_WtS; use System.WCh_WtS;
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package body Ada.Wide_Text_IO.Fixed_IO is
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-- Note: we still use the floating-point I/O routines for types whose small
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-- is not the ratio of two sufficiently small integers. This will result in
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-- inaccuracies for fixed point types that require more precision than is
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-- available in Long_Long_Float.
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subtype Int32 is Interfaces.Integer_32; use type Int32;
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subtype Int64 is Interfaces.Integer_64; use type Int64;
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subtype Int128 is Interfaces.Integer_128; use type Int128;
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package Aux32 is new
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Ada.Wide_Text_IO.Fixed_Aux (Int32, Scan_Fixed32, Set_Image_Fixed32);
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package Aux64 is new
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Ada.Wide_Text_IO.Fixed_Aux (Int64, Scan_Fixed64, Set_Image_Fixed64);
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package Aux128 is new
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Ada.Wide_Text_IO.Fixed_Aux (Int128, Scan_Fixed128, Set_Image_Fixed128);
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package Aux_Long_Long_Float is new
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Ada.Wide_Text_IO.Float_Aux (Long_Long_Float, Scan_Long_Long_Float);
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-- Throughout this generic body, we distinguish between the case where type
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-- Int32 is OK, where type Int64 is OK and where type Int128 is OK. These
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-- boolean constants are used to test for this, such that only code for the
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-- relevant case is included in the instance; that's why the computation of
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-- their value must be fully static (although it is not a static expression
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-- in the RM sense).
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OK_Get_32 : constant Boolean :=
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Num'Base'Object_Size <= 32
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**31)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**31)
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or else
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(Num'Small_Numerator <= 2**27
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and then Num'Small_Denominator <= 2**27));
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-- These conditions are derived from the prerequisites of System.Value_F
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OK_Put_32 : constant Boolean :=
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Num'Base'Object_Size <= 32
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**31)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**31)
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or else
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(Num'Small_Numerator < Num'Small_Denominator
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and then Num'Small_Denominator <= 2**27)
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or else
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(Num'Small_Denominator < Num'Small_Numerator
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and then Num'Small_Numerator <= 2**25));
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-- These conditions are derived from the prerequisites of System.Image_F
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OK_Get_64 : constant Boolean :=
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Num'Base'Object_Size <= 64
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**63)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**63)
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or else
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(Num'Small_Numerator <= 2**59
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and then Num'Small_Denominator <= 2**59));
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-- These conditions are derived from the prerequisites of System.Value_F
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OK_Put_64 : constant Boolean :=
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Num'Base'Object_Size <= 64
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**63)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**63)
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or else
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(Num'Small_Numerator < Num'Small_Denominator
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and then Num'Small_Denominator <= 2**59)
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or else
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(Num'Small_Denominator < Num'Small_Numerator
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and then Num'Small_Numerator <= 2**53));
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-- These conditions are derived from the prerequisites of System.Image_F
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OK_Get_128 : constant Boolean :=
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Num'Base'Object_Size <= 128
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**127)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**127)
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or else
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(Num'Small_Numerator <= 2**123
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and then Num'Small_Denominator <= 2**123));
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-- These conditions are derived from the prerequisites of System.Value_F
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OK_Put_128 : constant Boolean :=
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Num'Base'Object_Size <= 128
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and then
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((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**127)
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or else
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(Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**127)
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or else
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(Num'Small_Numerator < Num'Small_Denominator
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and then Num'Small_Denominator <= 2**123)
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or else
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(Num'Small_Denominator < Num'Small_Numerator
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and then Num'Small_Numerator <= 2**122));
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-- These conditions are derived from the prerequisites of System.Image_F
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E : constant Natural :=
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127 - 64 * Boolean'Pos (OK_Put_64) - 32 * Boolean'Pos (OK_Put_32);
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-- T'Size - 1 for the selected Int{32,64,128}
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F0 : constant Natural := 0;
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F1 : constant Natural :=
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F0 + 38 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F0) >= 1.0E+38);
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F2 : constant Natural :=
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F1 + 19 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F1) >= 1.0E+19);
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F3 : constant Natural :=
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F2 + 9 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F2) >= 1.0E+9);
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F4 : constant Natural :=
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F3 + 5 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F3) >= 1.0E+5);
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F5 : constant Natural :=
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F4 + 3 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F4) >= 1.0E+3);
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F6 : constant Natural :=
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F5 + 2 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F5) >= 1.0E+2);
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F7 : constant Natural :=
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F6 + 1 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F6) >= 1.0E+1);
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-- Binary search for the number of digits - 1 before the decimal point of
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-- the product 2.0**E * Num'Small.
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For0 : constant Natural := 2 + F7;
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-- Fore value for the fixed point type whose mantissa is Int{32,64,128} and
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-- whose small is Num'Small.
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---------
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-- Get --
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---------
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procedure Get
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(File : File_Type;
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Item : out Num;
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Width : Field := 0)
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is
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pragma Unsuppress (Range_Check);
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begin
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if OK_Get_32 then
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Item := Num'Fixed_Value
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(Aux32.Get (File, Width,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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elsif OK_Get_64 then
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Item := Num'Fixed_Value
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(Aux64.Get (File, Width,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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elsif OK_Get_128 then
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Item := Num'Fixed_Value
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(Aux128.Get (File, Width,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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else
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Aux_Long_Long_Float.Get (File, Long_Long_Float (Item), Width);
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end if;
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exception
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when Constraint_Error => raise Data_Error;
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end Get;
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procedure Get
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(Item : out Num;
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Width : Field := 0)
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is
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begin
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Get (Current_In, Item, Width);
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end Get;
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procedure Get
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(From : Wide_String;
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Item : out Num;
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Last : out Positive)
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is
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pragma Unsuppress (Range_Check);
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S : constant String := Wide_String_To_String (From, WCEM_Upper);
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-- String on which we do the actual conversion. Note that the method
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-- used for wide character encoding is irrelevant, since if there is
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-- a character outside the Standard.Character range then the call to
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-- Aux.Gets will raise Data_Error in any case.
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begin
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if OK_Get_32 then
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Item := Num'Fixed_Value
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(Aux32.Gets (S, Last,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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elsif OK_Get_64 then
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Item := Num'Fixed_Value
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(Aux64.Gets (S, Last,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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elsif OK_Get_128 then
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Item := Num'Fixed_Value
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(Aux128.Gets (S, Last,
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-Num'Small_Numerator,
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-Num'Small_Denominator));
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else
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Aux_Long_Long_Float.Gets (S, Long_Long_Float (Item), Last);
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end if;
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exception
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when Constraint_Error => raise Data_Error;
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end Get;
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---------
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-- Put --
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---------
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procedure Put
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(File : File_Type;
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Item : Num;
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Fore : Field := Default_Fore;
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Aft : Field := Default_Aft;
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Exp : Field := Default_Exp)
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is
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begin
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if OK_Put_32 then
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Aux32.Put (File, Int32'Integer_Value (Item), Fore, Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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elsif OK_Put_64 then
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Aux64.Put (File, Int64'Integer_Value (Item), Fore, Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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elsif OK_Put_128 then
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Aux128.Put (File, Int128'Integer_Value (Item), Fore, Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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else
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Aux_Long_Long_Float.Put
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(File, Long_Long_Float (Item), Fore, Aft, Exp);
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end if;
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end Put;
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procedure Put
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(Item : Num;
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Fore : Field := Default_Fore;
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Aft : Field := Default_Aft;
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Exp : Field := Default_Exp)
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is
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begin
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Put (Current_Out, Item, Fore, Aft, Exp);
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end Put;
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procedure Put
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(To : out Wide_String;
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Item : Num;
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Aft : Field := Default_Aft;
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Exp : Field := Default_Exp)
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is
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S : String (To'First .. To'Last);
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begin
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if OK_Put_32 then
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Aux32.Puts (S, Int32'Integer_Value (Item), Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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elsif OK_Put_64 then
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Aux64.Puts (S, Int64'Integer_Value (Item), Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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elsif OK_Put_128 then
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Aux128.Puts (S, Int128'Integer_Value (Item), Aft, Exp,
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-Num'Small_Numerator, -Num'Small_Denominator,
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For0, Num'Aft);
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else
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Aux_Long_Long_Float.Puts (S, Long_Long_Float (Item), Aft, Exp);
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end if;
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for J in S'Range loop
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To (J) := Wide_Character'Val (Character'Pos (S (J)));
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end loop;
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end Put;
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end Ada.Wide_Text_IO.Fixed_IO;
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