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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ U T I L --
-- --
-- S p e c --
-- --
-- Copyright (C) 2020-2023, 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. --
-- --
------------------------------------------------------------------------------
-- This package provides some common utilities used by the s-imgxxx files
package System.Img_Util is
Max_Real_Image_Length : constant := 5200;
-- If Exp is set to zero and Aft is set to Text_IO.Field'Last (i.e., 255)
-- then Long_Long_Float'Last generates an image whose length is slightly
-- less than 5200.
procedure Set_Decimal_Digits
(Digs : in out String;
NDigs : Natural;
S : out String;
P : in out Natural;
Scale : Integer;
Fore : Natural;
Aft : Natural;
Exp : Natural);
-- Sets the image of Digs (1 .. NDigs), which is a string of decimal digits
-- preceded by either a minus sign or a space, i.e. the integer image of
-- the value in units of delta if this is for a decimal fixed point type
-- with the given Scale, or the integer image of the value converted to an
-- implicit decimal fixed point type with the given Scale if this is for an
-- ordinary fixed point type, starting at S (P + 1), updating P to point to
-- the last character stored. The caller promises that the buffer is large
-- enough and therefore no check is made for it. Constraint_Error will not
-- necessarily be raised if the requirement is violated since it is valid
-- to compile this unit with checks off. The Fore, Aft and Exp values can
-- be set to any valid values for the case of use by Text_IO.Decimal_IO or
-- Text_IO.Fixed_IO. Note that there is no leading space stored. The call
-- may destroy the value in Digs, which is why Digs is in-out (this happens
-- if rounding is required).
type Floating_Invalid_Value is (Minus_Infinity, Infinity, Not_A_Number);
procedure Set_Floating_Invalid_Value
(V : Floating_Invalid_Value;
S : out String;
P : in out Natural;
Fore : Natural;
Aft : Natural;
Exp : Natural);
-- Sets the image of a floating-point invalid value, starting at S (P + 1),
-- updating P to point to the last character stored. The caller promises
-- that the buffer is large enough and therefore no check is made for it.
-- Constraint_Error will not necessarily be raised if the requirement is
-- violated since it is valid to compile this unit with checks off.
end System.Img_Util;
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