84 lines
4.5 KiB
Ada
84 lines
4.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . I M G _ D E C --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, 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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-- Image for decimal fixed types where the size of the corresponding integer
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-- type does not exceed Integer'Size (also used for Text_IO.Decimal_IO output)
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package System.Img_Dec is
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pragma Pure;
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procedure Image_Decimal
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(V : Integer;
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S : in out String;
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P : out Natural;
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Scale : Integer);
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-- Computes fixed_type'Image (V), where V is the integer value (in units of
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-- delta) of a decimal type whose Scale is as given and stores the result
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-- S (1 .. P), updating P to the value of L. The image is given by the
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-- rules in RM 3.5(34) for fixed-point type image functions. The caller
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-- guarantees that S is long enough to hold the result. S need not have a
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-- lower bound of 1.
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procedure Set_Image_Decimal
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(V : Integer;
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S : in out String;
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P : in out Natural;
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Scale : Integer;
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Fore : Natural;
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Aft : Natural;
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Exp : Natural);
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-- Sets the image of V, where V is the integer value (in units of delta)
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-- of a decimal type with the given Scale, starting at S (P + 1), updating
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-- P to point to the last character stored, the caller promises that the
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-- buffer is large enough and no check is made for this. Constraint_Error
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-- will not necessarily be raised if this requirement is violated, since
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-- it is perfectly valid to compile this unit with checks off. The Fore,
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-- Aft and Exp values can be set to any valid values for the case of use
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-- by Text_IO.Decimal_IO. Note that there is no leading space stored.
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procedure Set_Decimal_Digits
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(Digs : in out String;
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NDigs : Natural;
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S : out String;
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P : in out Natural;
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Scale : Integer;
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Fore : Natural;
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Aft : Natural;
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Exp : Natural);
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-- This procedure has the same semantics as Set_Image_Decimal, except that
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-- the value in Digs (1 .. NDigs) is given as a string of decimal digits
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-- preceded by either a minus sign or a space (i.e. the integer image of
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-- the value in units of delta). The call may destroy the value in Digs,
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-- which is why Digs is in-out (this happens if rounding is required).
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-- Set_Decimal_Digits is shared by all the decimal image routines.
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end System.Img_Dec;
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