139 lines
4.8 KiB
Ada
139 lines
4.8 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 _ W I U --
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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 System.Unsigned_Types; use System.Unsigned_Types;
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package body System.Img_WIU is
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-----------------------------
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-- Set_Image_Width_Integer --
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-----------------------------
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procedure Set_Image_Width_Integer
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(V : Integer;
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W : Integer;
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S : out String;
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P : in out Natural)
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is
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Start : Natural;
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begin
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-- Positive case can just use the unsigned circuit directly
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if V >= 0 then
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Set_Image_Width_Unsigned (Unsigned (V), W, S, P);
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-- Negative case has to set a minus sign. Note also that we have to be
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-- careful not to generate overflow with the largest negative number.
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else
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P := P + 1;
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S (P) := ' ';
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Start := P;
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declare
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pragma Suppress (Overflow_Check);
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pragma Suppress (Range_Check);
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begin
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Set_Image_Width_Unsigned (Unsigned (-V), W - 1, S, P);
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end;
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-- Set minus sign in last leading blank location. Because of the
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-- code above, there must be at least one such location.
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while S (Start + 1) = ' ' loop
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Start := Start + 1;
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end loop;
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S (Start) := '-';
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end if;
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end Set_Image_Width_Integer;
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------------------------------
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-- Set_Image_Width_Unsigned --
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------------------------------
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procedure Set_Image_Width_Unsigned
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(V : Unsigned;
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W : Integer;
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S : out String;
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P : in out Natural)
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is
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Start : constant Natural := P;
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F, T : Natural;
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procedure Set_Digits (T : Unsigned);
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-- Set digits of absolute value of T
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----------------
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-- Set_Digits --
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----------------
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procedure Set_Digits (T : Unsigned) is
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begin
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if T >= 10 then
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Set_Digits (T / 10);
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P := P + 1;
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S (P) := Character'Val (T mod 10 + Character'Pos ('0'));
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else
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P := P + 1;
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S (P) := Character'Val (T + Character'Pos ('0'));
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end if;
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end Set_Digits;
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-- Start of processing for Set_Image_Width_Unsigned
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begin
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Set_Digits (V);
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-- Add leading spaces if required by width parameter
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if P - Start < W then
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F := P;
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P := P + (W - (P - Start));
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T := P;
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while F > Start loop
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S (T) := S (F);
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T := T - 1;
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F := F - 1;
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end loop;
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for J in Start + 1 .. T loop
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S (J) := ' ';
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end loop;
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end if;
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end Set_Image_Width_Unsigned;
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end System.Img_WIU;
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