| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . I M A G E _ F -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2020-2022, 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 contains the routines for supporting the Image attribute for |
| -- ordinary fixed point types whose Small is the ratio of two Int values, and |
| -- also for conversion operations required in Text_IO.Fixed_IO for such types. |
| |
| generic |
| |
| type Int is range <>; |
| |
| with procedure Scaled_Divide |
| (X, Y, Z : Int; |
| Q, R : out Int; |
| Round : Boolean); |
| |
| package System.Image_F is |
| pragma Pure; |
| |
| procedure Image_Fixed |
| (V : Int; |
| S : in out String; |
| P : out Natural; |
| Num : Int; |
| Den : Int; |
| For0 : Natural; |
| Aft0 : Natural); |
| -- Computes fixed_type'Image (V), where V is the integer value (in units of |
| -- small) of an ordinary fixed point type with small Num/Den, and stores |
| -- the result in S (1 .. P), updating P on return. The result is computed |
| -- according to the rules for image for fixed-point types (RM 3.5(34)). |
| -- For0 and Aft0 are the values of the Fore and Aft attributes for the |
| -- fixed point type whose mantissa type is Int and whose small is Num/Den. |
| -- This function is used only for fixed point whose Small is an integer or |
| -- its reciprocal (see package System.Image_R for the handling of other |
| -- ordinary fixed-point types). The caller guarantees that S is long enough |
| -- to hold the result and has a lower bound of 1. |
| |
| procedure Set_Image_Fixed |
| (V : Int; |
| S : in out String; |
| P : in out Natural; |
| Num : Int; |
| Den : Int; |
| For0 : Natural; |
| Aft0 : Natural; |
| Fore : Natural; |
| Aft : Natural; |
| Exp : Natural); |
| -- Sets the image of V, where V is the integer value (in units of small) |
| -- of a fixed point type with small Num/Den, starting at S (P + 1) and |
| -- updating P to point to the last character stored, the caller promises |
| -- that the buffer is large enough and no check is made. Constraint_Error |
| -- will not necessarily be raised if this requirement is violated, since |
| -- it is perfectly valid to compile this unit with checks off. For0 and |
| -- Aft0 are the values of the Fore and Aft attributes for the fixed point |
| -- type whose mantissa type is Int and whose small is Num/Den. The Fore, |
| -- Aft and Exp can be set to any valid values for use by Text_IO.Fixed_IO. |
| |
| end System.Image_F; |
