| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- A D A . W I D E _ W I D E _ T E X T _ I O . F I X E D _ I O -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2023, 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- 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_Wide_Text_IO.Fixed_Aux; |
| with Ada.Wide_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.Img_LFlt; use System.Img_LFlt; |
| with System.Val_Fixed_32; use System.Val_Fixed_32; |
| with System.Val_Fixed_64; use System.Val_Fixed_64; |
| with System.Val_LFlt; use System.Val_LFlt; |
| with System.WCh_Con; use System.WCh_Con; |
| with System.WCh_WtS; use System.WCh_WtS; |
| |
| package body Ada.Wide_Wide_Text_IO.Fixed_IO is |
| |
| -- Note: we still use the floating-point I/O routines for types whose small |
| -- is not the ratio of two sufficiently small integers. This will result in |
| -- inaccuracies for fixed point types that require more precision than is |
| -- available in Long_Float. |
| |
| subtype Int32 is Interfaces.Integer_32; use type Int32; |
| subtype Int64 is Interfaces.Integer_64; use type Int64; |
| |
| package Aux32 is new |
| Ada.Wide_Wide_Text_IO.Fixed_Aux (Int32, Scan_Fixed32, Set_Image_Fixed32); |
| |
| package Aux64 is new |
| Ada.Wide_Wide_Text_IO.Fixed_Aux (Int64, Scan_Fixed64, Set_Image_Fixed64); |
| |
| package Aux_Long_Float is new |
| Ada.Wide_Wide_Text_IO.Float_Aux |
| (Long_Float, Scan_Long_Float, Set_Image_Long_Float); |
| |
| -- Throughout this generic body, we distinguish between the case where type |
| -- Int32 is OK and where type Int64 is OK. These boolean constants are used |
| -- to test for this, such that only code for the relevant case is included |
| -- in the instance; that's why the computation of their value must be fully |
| -- static (although it is not a static expressions in the RM sense). |
| |
| OK_Get_32 : constant Boolean := |
| Num'Base'Object_Size <= 32 |
| and then |
| ((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**31) |
| or else |
| (Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**31) |
| or else |
| (Num'Small_Numerator <= 2**27 |
| and then Num'Small_Denominator <= 2**27)); |
| -- These conditions are derived from the prerequisites of System.Value_F |
| |
| OK_Put_32 : constant Boolean := |
| Num'Base'Object_Size <= 32 |
| and then |
| ((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**31) |
| or else |
| (Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**31) |
| or else |
| (Num'Small_Numerator < Num'Small_Denominator |
| and then Num'Small_Denominator <= 2**27) |
| or else |
| (Num'Small_Denominator < Num'Small_Numerator |
| and then Num'Small_Numerator <= 2**25)); |
| -- These conditions are derived from the prerequisites of System.Image_F |
| |
| OK_Get_64 : constant Boolean := |
| Num'Base'Object_Size <= 64 |
| and then |
| ((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**63) |
| or else |
| (Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**63) |
| or else |
| (Num'Small_Numerator <= 2**59 |
| and then Num'Small_Denominator <= 2**59)); |
| -- These conditions are derived from the prerequisites of System.Value_F |
| |
| OK_Put_64 : constant Boolean := |
| Num'Base'Object_Size <= 64 |
| and then |
| ((Num'Small_Numerator = 1 and then Num'Small_Denominator <= 2**63) |
| or else |
| (Num'Small_Denominator = 1 and then Num'Small_Numerator <= 2**63) |
| or else |
| (Num'Small_Numerator < Num'Small_Denominator |
| and then Num'Small_Denominator <= 2**59) |
| or else |
| (Num'Small_Denominator < Num'Small_Numerator |
| and then Num'Small_Numerator <= 2**53)); |
| -- These conditions are derived from the prerequisites of System.Image_F |
| |
| E : constant Natural := 63 - 32 * Boolean'Pos (OK_Put_32); |
| -- 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 OK_Get_32 then |
| Item := Num'Fixed_Value |
| (Aux32.Get (File, Width, |
| -Num'Small_Numerator, |
| -Num'Small_Denominator)); |
| elsif OK_Get_64 then |
| Item := Num'Fixed_Value |
| (Aux64.Get (File, Width, |
| -Num'Small_Numerator, |
| -Num'Small_Denominator)); |
| else |
| Aux_Long_Float.Get (File, Long_Float (Item), Width); |
| end if; |
| |
| exception |
| when Constraint_Error => raise Data_Error; |
| end Get; |
| |
| procedure Get |
| (Item : out Num; |
| Width : Field := 0) |
| is |
| begin |
| Get (Current_In, Item, Width); |
| end Get; |
| |
| procedure Get |
| (From : Wide_Wide_String; |
| Item : out Num; |
| Last : out Positive) |
| is |
| pragma Unsuppress (Range_Check); |
| |
| S : constant String := Wide_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 OK_Get_32 then |
| Item := Num'Fixed_Value |
| (Aux32.Gets (S, Last, |
| -Num'Small_Numerator, |
| -Num'Small_Denominator)); |
| elsif OK_Get_64 then |
| Item := Num'Fixed_Value |
| (Aux64.Gets (S, Last, |
| -Num'Small_Numerator, |
| -Num'Small_Denominator)); |
| else |
| Aux_Long_Float.Gets (S, Long_Float (Item), Last); |
| 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 OK_Put_32 then |
| Aux32.Put (File, Int32'Integer_Value (Item), Fore, Aft, Exp, |
| -Num'Small_Numerator, -Num'Small_Denominator, |
| For0, Num'Aft); |
| elsif OK_Put_64 then |
| Aux64.Put (File, Int64'Integer_Value (Item), Fore, Aft, Exp, |
| -Num'Small_Numerator, -Num'Small_Denominator, |
| For0, Num'Aft); |
| else |
| Aux_Long_Float.Put (File, Long_Float (Item), Fore, Aft, Exp); |
| end if; |
| end Put; |
| |
| procedure Put |
| (Item : Num; |
| Fore : Field := Default_Fore; |
| Aft : Field := Default_Aft; |
| Exp : Field := Default_Exp) |
| is |
| begin |
| Put (Current_Out, Item, Fore, Aft, Exp); |
| end Put; |
| |
| procedure Put |
| (To : out Wide_Wide_String; |
| Item : Num; |
| Aft : Field := Default_Aft; |
| Exp : Field := Default_Exp) |
| is |
| S : String (To'First .. To'Last); |
| |
| begin |
| if OK_Put_32 then |
| Aux32.Puts (S, Int32'Integer_Value (Item), Aft, Exp, |
| -Num'Small_Numerator, -Num'Small_Denominator, |
| For0, Num'Aft); |
| elsif OK_Put_64 then |
| Aux64.Puts (S, Int64'Integer_Value (Item), Aft, Exp, |
| -Num'Small_Numerator, -Num'Small_Denominator, |
| For0, Num'Aft); |
| else |
| Aux_Long_Float.Puts (S, Long_Float (Item), Aft, Exp); |
| end if; |
| |
| for J in S'Range loop |
| To (J) := Wide_Wide_Character'Val (Character'Pos (S (J))); |
| end loop; |
| end Put; |
| |
| end Ada.Wide_Wide_Text_IO.Fixed_IO; |
