------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- A D A . W I D E _ T E X T _ I O . F I X E D _ I O -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2020, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Interfaces; with Ada.Wide_Text_IO.Fixed_Aux; with Ada.Wide_Text_IO.Float_Aux; with System.Img_Fixed_32; use System.Img_Fixed_32; with System.Img_Fixed_64; use System.Img_Fixed_64; with System.Val_Fixed_32; use System.Val_Fixed_32; with System.Val_Fixed_64; use System.Val_Fixed_64; with System.WCh_Con; use System.WCh_Con; with System.WCh_WtS; use System.WCh_WtS; package body Ada.Wide_Text_IO.Fixed_IO is -- Note: we still use the floating-point I/O routines for types whose small -- is not a sufficiently small integer or the reciprocal thereof. This will -- result in inaccuracies for fixed point types that require more precision -- than is available in Long_Long_Float. subtype Int32 is Interfaces.Integer_32; subtype Int64 is Interfaces.Integer_64; package Aux32 is new Ada.Wide_Text_IO.Fixed_Aux (Int32, Scan_Fixed32, Set_Image_Fixed32); package Aux64 is new Ada.Wide_Text_IO.Fixed_Aux (Int64, Scan_Fixed64, Set_Image_Fixed64); Exact : constant Boolean := (Float'Floor (Num'Small) = Float'Ceiling (Num'Small) or else Float'Floor (1.0 / Num'Small) = Float'Ceiling (1.0 / Num'Small)) and then Num'Small >= 2.0**(-63) and then Num'Small <= 2.0**63; -- True if the exact algorithm implemented in Fixed_Aux can be used. The -- condition is a Small which is either an integer or the reciprocal of an -- integer with the appropriate magnitude. Need_64 : constant Boolean := Num'Object_Size > 32 or else Num'Small > 2.0**31 or else Num'Small < 2.0**(-31); -- Throughout this generic body, we distinguish between the case where type -- Int32 is acceptable and where type Int64 is needed. This Boolean is used -- to test for these cases and since it is a constant, only code for the -- relevant case will be included in the instance. E : constant Natural := 31 + 32 * Boolean'Pos (Need_64); -- T'Size - 1 for the selected Int{32,64} F0 : constant Natural := 0; F1 : constant Natural := F0 + 18 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F0) >= 1.0E+18); F2 : constant Natural := F1 + 9 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F1) >= 1.0E+9); F3 : constant Natural := F2 + 5 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F2) >= 1.0E+5); F4 : constant Natural := F3 + 3 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F3) >= 1.0E+3); F5 : constant Natural := F4 + 2 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F4) >= 1.0E+2); F6 : constant Natural := F5 + 1 * Boolean'Pos (2.0**E * Num'Small * 10.0**(-F5) >= 1.0E+1); -- Binary search for the number of digits - 1 before the decimal point of -- the product 2.0**E * Num'Small. For0 : constant Natural := 2 + F6; -- Fore value for the fixed point type whose mantissa is Int{32,64} and -- whose small is Num'Small. --------- -- Get -- --------- procedure Get (File : File_Type; Item : out Num; Width : Field := 0) is pragma Unsuppress (Range_Check); begin if not Exact then Float_Aux.Get (File, Long_Long_Float (Item), Width); elsif Need_64 then Item := Num'Fixed_Value (Aux64.Get (File, Width, Int64 (-Float'Ceiling (Num'Small)), Int64 (-Float'Ceiling (1.0 / Num'Small)))); else Item := Num'Fixed_Value (Aux32.Get (File, Width, Int32 (-Float'Ceiling (Num'Small)), Int32 (-Float'Ceiling (1.0 / Num'Small)))); end if; exception when Constraint_Error => raise Data_Error; end Get; procedure Get (Item : out Num; Width : Field := 0) is begin Get (Current_Input, Item, Width); end Get; procedure Get (From : Wide_String; Item : out Num; Last : out Positive) is pragma Unsuppress (Range_Check); S : constant String := Wide_String_To_String (From, WCEM_Upper); -- String on which we do the actual conversion. Note that the method -- used for wide character encoding is irrelevant, since if there is -- a character outside the Standard.Character range then the call to -- Aux.Gets will raise Data_Error in any case. begin if not Exact then Float_Aux.Gets (S, Long_Long_Float (Item), Last); elsif Need_64 then Item := Num'Fixed_Value (Aux64.Gets (S, Last, Int64 (-Float'Ceiling (Num'Small)), Int64 (-Float'Ceiling (1.0 / Num'Small)))); else Item := Num'Fixed_Value (Aux32.Gets (S, Last, Int32 (-Float'Ceiling (Num'Small)), Int32 (-Float'Ceiling (1.0 / Num'Small)))); end if; exception when Constraint_Error => raise Data_Error; end Get; --------- -- Put -- --------- procedure Put (File : File_Type; Item : Num; Fore : Field := Default_Fore; Aft : Field := Default_Aft; Exp : Field := Default_Exp) is begin if not Exact then Float_Aux.Put (File, Long_Long_Float (Item), Fore, Aft, Exp); elsif Need_64 then Aux64.Put (File, Int64'Integer_Value (Item), Fore, Aft, Exp, Int64 (-Float'Ceiling (Num'Small)), Int64 (-Float'Ceiling (1.0 / Num'Small)), For0, Num'Aft); else Aux32.Put (File, Int32'Integer_Value (Item), Fore, Aft, Exp, Int32 (-Float'Ceiling (Num'Small)), Int32 (-Float'Ceiling (1.0 / Num'Small)), For0, Num'Aft); end if; end Put; procedure Put (Item : Num; Fore : Field := Default_Fore; Aft : Field := Default_Aft; Exp : Field := Default_Exp) is begin Put (Current_Output, Item, Fore, Aft, Exp); end Put; procedure Put (To : out Wide_String; Item : Num; Aft : Field := Default_Aft; Exp : Field := Default_Exp) is S : String (To'First .. To'Last); begin if not Exact then Float_Aux.Puts (S, Long_Long_Float (Item), Aft, Exp); elsif Need_64 then Aux64.Puts (S, Int64'Integer_Value (Item), Aft, Exp, Int64 (-Float'Ceiling (Num'Small)), Int64 (-Float'Ceiling (1.0 / Num'Small)), For0, Num'Aft); else Aux32.Puts (S, Int32'Integer_Value (Item), Aft, Exp, Int32 (-Float'Ceiling (Num'Small)), Int32 (-Float'Ceiling (1.0 / Num'Small)), For0, Num'Aft); end if; for J in S'Range loop To (J) := Wide_Character'Val (Character'Pos (S (J))); end loop; end Put; end Ada.Wide_Text_IO.Fixed_IO;