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s-imgdec.adb (Set_Decimal_Digits): Fix error when input is zero with negative scale

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2008-04-08  Robert Dewar  <dewar@adacore.com>

	* s-imgdec.adb (Set_Decimal_Digits): Fix error when input is zero with
	negative scale
	(Set_Decimal_Digits): Properly handle Aft=0 (equivalent to Aft=1)
	Properly handle case where Aft > Scale and input number is less than
	one.

From-SVN: r134050
This commit is contained in:
Robert Dewar 2008-04-08 08:55:17 +02:00 committed by Arnaud Charlet
parent ca44152fc5
commit fc5c20afff
1 changed files with 27 additions and 9 deletions
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36
gcc/ada/s-imgdec.adb
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@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
-- Copyright (C) 1992-2008, 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- --
@ -129,6 +129,10 @@ package body System.Img_Dec is
pragma Inline (Set_Zeroes);
-- Set N zeroes, no effect if N is negative
-----------
-- Round --
-----------
procedure Round (N : Natural) is
D : Character;
@ -250,7 +254,7 @@ package body System.Img_Dec is
if Exp > 0 then
Set_Blanks_And_Sign (Fore - 1);
Round (Aft + 2);
Round (Digits_After_Point + 2);
Set (Digs (FD));
FD := FD + 1;
ND := ND - 1;
@ -258,7 +262,6 @@ package body System.Img_Dec is
if ND >= Digits_After_Point then
Set_Digits (FD, FD + Digits_After_Point - 1);
else
Set_Digits (FD, LD);
Set_Zeroes (Digits_After_Point - ND);
@ -317,27 +320,42 @@ package body System.Img_Dec is
Set_Blanks_And_Sign (Fore - 1);
Set ('0');
Set ('.');
Set_Zeroes (Digits_After_Point - ND);
Set_Zeroes (-Digits_Before_Point);
Set_Digits (FD, LD);
Set_Zeroes (Digits_After_Point - Scale);
-- At least one digit before point in input
else
Set_Blanks_And_Sign (Fore - Digits_Before_Point);
-- Less digits in input than are needed before point
-- Input: 1PP Output: 100.000
if ND < Digits_Before_Point then
Set_Digits (FD, LD);
Set_Zeroes (Digits_Before_Point - ND);
-- Special case, if the input is the single digit 0, then we
-- do not want 000.000, but instead 0.000.
if ND = 1 and then Digs (FD) = '0' then
Set_Blanks_And_Sign (Fore - 1);
Set ('0');
-- Normal case where we need to output scaling zeroes
else
Set_Blanks_And_Sign (Fore - Digits_Before_Point);
Set_Digits (FD, LD);
Set_Zeroes (Digits_Before_Point - ND);
end if;
-- Set period and zeroes after the period
Set ('.');
Set_Zeroes (Digits_After_Point);
-- Input has full amount of digits before decimal point
else
Set_Blanks_And_Sign (Fore - Digits_Before_Point);
Set_Digits (FD, FD + Digits_Before_Point - 1);
Set ('.');
Set_Digits (FD + Digits_Before_Point, LD);