160 lines
4.9 KiB
Ada
160 lines
4.9 KiB
Ada
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------------------------------------------------------------------------------
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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 _ 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 Ada.Wide_Wide_Text_IO.Generic_Aux; use Ada.Wide_Wide_Text_IO.Generic_Aux;
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package body Ada.Wide_Wide_Text_IO.Fixed_Aux is
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---------
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-- Get --
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---------
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function Get
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(File : File_Type;
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Width : Field;
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Num : Int;
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Den : Int) return Int
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is
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Buf : String (1 .. Field'Last);
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Ptr : aliased Integer;
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Stop : Integer := 0;
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Item : Int;
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begin
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if Width /= 0 then
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Load_Width (File, Width, Buf, Stop);
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String_Skip (Buf, Ptr);
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else
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Load_Real (File, Buf, Stop);
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Ptr := 1;
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end if;
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Item := Scan (Buf, Ptr'Access, Stop, Num, Den);
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Check_End_Of_Field (Buf, Stop, Ptr, Width);
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return Item;
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end Get;
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----------
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-- Gets --
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----------
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function Gets
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(From : String;
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Last : out Positive;
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Num : Int;
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Den : Int) return Int
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is
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Pos : aliased Integer;
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Item : Int;
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begin
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String_Skip (From, Pos);
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Item := Scan (From, Pos'Access, From'Last, Num, Den);
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Last := Pos - 1;
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return Item;
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exception
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when Constraint_Error =>
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Last := Pos - 1;
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raise Data_Error;
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end Gets;
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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 : Int;
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Fore : Field;
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Aft : Field;
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Exp : Natural;
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Num : Int;
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Den : Int;
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For0 : Natural;
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Aft0 : Natural)
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is
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Buf : String (1 .. Field'Last);
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Ptr : Natural := 0;
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begin
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Set_Image (Item, Buf, Ptr, Num, Den, For0, Aft0, Fore, Aft, Exp);
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Put_Item (File, Buf (1 .. Ptr));
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end Put;
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----------
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-- Puts --
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----------
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procedure Puts
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(To : out String;
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Item : Int;
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Aft : Field;
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Exp : Natural;
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Num : Int;
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Den : Int;
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For0 : Natural;
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Aft0 : Natural)
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is
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Buf : String (1 .. Positive'Max (Field'Last, To'Length));
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Fore : Integer;
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Ptr : Natural := 0;
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begin
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-- Compute Fore, allowing for the decimal dot and Aft digits
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Fore := To'Length - 1 - Field'Max (1, Aft);
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-- Allow for Exp and one more for E if exponent present
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if Exp /= 0 then
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Fore := Fore - 1 - Field'Max (2, Exp);
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end if;
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-- Make sure we have enough room
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if Fore < 1 + Boolean'Pos (Item < 0) then
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raise Layout_Error;
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end if;
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-- Do the conversion and check length of result
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Set_Image (Item, Buf, Ptr, Num, Den, For0, Aft0, Fore, Aft, Exp);
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if Ptr > To'Length then
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raise Layout_Error;
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else
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To := Buf (1 .. Ptr);
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end if;
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end Puts;
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end Ada.Wide_Wide_Text_IO.Fixed_Aux;
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