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1994-05-19
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3KB
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46 lines
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ L L F --
-- --
-- B o d y --
-- --
-- $Revision: 1.5 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
-- This is a little messed up for now, since we can't assume that the
-- accessible sprintf routine handles long long float. We print the right
-- number of digits, but the precision may get degraded. On almost all
-- machines Long_Long_Float is the same as Long_Float so it doesn't matter
-- but notably for the Intel x86, this will need fixing later on (???).
function System.Img_LLF (V : Long_Long_Float; B : Address) return Natural is
procedure sprintf (Target, Fmt : Address;
Prec : Natural;
Val : Long_Float;
Length_Ptr : Address);
pragma Import (C, sprintf);
Fmt : constant String := "% .*e%n" & Ascii.NUL;
Length : aliased Natural;
begin
sprintf (B, Fmt'Address, Long_Long_Float'digits, Long_Float (V),
Length'Address);
return Length;
end System.Img_LLF;