176 lines
6.2 KiB
Ada
176 lines
6.2 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 . T E X T _ I O . F L O A T _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2020, 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.Text_IO.Float_Aux;
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with System.Val_Flt; use System.Val_Flt;
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with System.Val_LFlt; use System.Val_LFlt;
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with System.Val_LLF; use System.Val_LLF;
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package body Ada.Text_IO.Float_IO with SPARK_Mode => Off is
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package Aux_Float is new
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Ada.Text_IO.Float_Aux (Float, Scan_Float);
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package Aux_Long_Float is new
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Ada.Text_IO.Float_Aux (Long_Float, Scan_Long_Float);
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package Aux_Long_Long_Float is new
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Ada.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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-- Float is OK, where type Long_Float is OK and where type Long_Long_Float
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-- is needed. These boolean constants are used to test for this, such that
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-- only code for the relevant case is included in the instance.
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OK_Float : constant Boolean := Num'Base'Digits <= Float'Digits;
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OK_Long_Float : constant Boolean := Num'Base'Digits <= Long_Float'Digits;
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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_Float then
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Aux_Float.Get (File, Float (Item), Width);
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elsif OK_Long_Float then
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Aux_Long_Float.Get (File, Long_Float (Item), Width);
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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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-- In the case where the type is unconstrained (e.g. Standard'Float),
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-- the above conversion may result in an infinite value, which is
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-- normally fine for a conversion, but in this case, we want to treat
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-- that as a data error.
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if not Item'Valid then
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raise Data_Error;
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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 : 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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begin
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if OK_Float then
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Aux_Float.Gets (From, Float (Item), Last);
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elsif OK_Long_Float then
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Aux_Long_Float.Gets (From, Long_Float (Item), Last);
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else
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Aux_Long_Long_Float.Gets (From, Long_Long_Float (Item), Last);
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end if;
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-- In the case where the type is unconstrained (e.g. Standard'Float),
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-- the above conversion may result in an infinite value, which is
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-- normally fine for a conversion, but in this case, we want to treat
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-- that as a data error.
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if not Item'Valid then
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raise Data_Error;
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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_Float then
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Aux_Float.Put (File, Float (Item), Fore, Aft, Exp);
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elsif OK_Long_Float then
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Aux_Long_Float.Put (File, Long_Float (Item), Fore, Aft, Exp);
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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 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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begin
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if OK_Float then
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Aux_Float.Puts (To, Float (Item), Aft, Exp);
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elsif OK_Long_Float then
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Aux_Long_Float.Puts (To, Long_Float (Item), Aft, Exp);
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else
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Aux_Long_Long_Float.Puts (To, Long_Long_Float (Item), Aft, Exp);
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end if;
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end Put;
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end Ada.Text_IO.Float_IO;
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