236 lines
6.7 KiB
Ada
236 lines
6.7 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 . T E X T _ I O . F L O A T _ A U X --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2014, 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.Generic_Aux; use Ada.Text_IO.Generic_Aux;
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with System.Img_Real; use System.Img_Real;
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with System.Val_Real; use System.Val_Real;
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package body Ada.Text_IO.Float_Aux is
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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 Long_Long_Float;
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Width : Field)
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is
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Buf : String (1 .. Field'Last);
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Stop : Integer := 0;
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Ptr : aliased Integer := 1;
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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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end if;
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Item := Scan_Real (Buf, Ptr'Access, Stop);
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Check_End_Of_Field (Buf, Stop, Ptr, Width);
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end Get;
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----------
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-- Gets --
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----------
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procedure Gets
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(From : String;
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Item : out Long_Long_Float;
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Last : out Positive)
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is
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Pos : aliased Integer;
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begin
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String_Skip (From, Pos);
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Item := Scan_Real (From, Pos'Access, From'Last);
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Last := Pos - 1;
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exception
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when Constraint_Error =>
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raise Data_Error;
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end Gets;
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---------------
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-- Load_Real --
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---------------
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procedure Load_Real
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(File : File_Type;
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Buf : out String;
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Ptr : in out Natural)
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is
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Loaded : Boolean;
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begin
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-- Skip initial blanks, and load possible sign
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Load_Skip (File);
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Load (File, Buf, Ptr, '+', '-');
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-- Case of .nnnn
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Load (File, Buf, Ptr, '.', Loaded);
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if Loaded then
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Load_Digits (File, Buf, Ptr, Loaded);
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-- Hopeless junk if no digits loaded
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if not Loaded then
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return;
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end if;
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-- Otherwise must have digits to start
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else
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Load_Digits (File, Buf, Ptr, Loaded);
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-- Hopeless junk if no digits loaded
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if not Loaded then
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return;
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end if;
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-- Based cases. We recognize either the standard '#' or the
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-- allowed alternative replacement ':' (see RM J.2(3)).
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Load (File, Buf, Ptr, '#', ':', Loaded);
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if Loaded then
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-- Case of nnn#.xxx#
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Load (File, Buf, Ptr, '.', Loaded);
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if Loaded then
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Load_Extended_Digits (File, Buf, Ptr);
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Load (File, Buf, Ptr, '#', ':');
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-- Case of nnn#xxx.[xxx]# or nnn#xxx#
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else
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Load_Extended_Digits (File, Buf, Ptr);
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Load (File, Buf, Ptr, '.', Loaded);
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if Loaded then
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Load_Extended_Digits (File, Buf, Ptr);
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end if;
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-- As usual, it seems strange to allow mixed base characters,
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-- but that is what ACVC tests expect, see CE3804M, case (3).
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Load (File, Buf, Ptr, '#', ':');
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end if;
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-- Case of nnn.[nnn] or nnn
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else
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-- Prevent the potential processing of '.' in cases where the
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-- initial digits have a trailing underscore.
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if Buf (Ptr) = '_' then
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return;
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end if;
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Load (File, Buf, Ptr, '.', Loaded);
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if Loaded then
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Load_Digits (File, Buf, Ptr);
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end if;
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end if;
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end if;
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-- Deal with exponent
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Load (File, Buf, Ptr, 'E', 'e', Loaded);
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if Loaded then
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Load (File, Buf, Ptr, '+', '-');
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Load_Digits (File, Buf, Ptr);
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end if;
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end Load_Real;
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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 : Long_Long_Float;
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Fore : Field;
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Aft : Field;
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Exp : Field)
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is
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Buf : String (1 .. 3 * Field'Last + 2);
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Ptr : Natural := 0;
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begin
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Set_Image_Real (Item, Buf, Ptr, 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 : Long_Long_Float;
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Aft : Field;
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Exp : Field)
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is
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Buf : String (1 .. 3 * Field'Last + 2);
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Ptr : Natural := 0;
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begin
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Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => 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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for J in 1 .. Ptr loop
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To (To'Last - Ptr + J) := Buf (J);
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end loop;
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for J in To'First .. To'Last - Ptr loop
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To (J) := ' ';
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end loop;
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end if;
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end Puts;
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end Ada.Text_IO.Float_Aux;
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