1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . I M G _ D E C --
9 -- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- Image for decimal fixed types where the size of the corresponding integer
35 -- type does not exceed Integer'Size (also used for Text_IO.Decimal_IO output)
37 package System
.Img_Dec
is
38 pragma Preelaborate
(Img_Dec
);
40 function Image_Decimal
44 -- Compute 'Image of V, the integer value (in units of delta) of a decimal
45 -- type whose Scale is as given and return the result. THe image is given
46 -- by the rules in RM 3.5(34) for fixed-point type image functions.
48 procedure Set_Image_Decimal
56 -- Sets the image of V, where V is the integer value (in units of delta)
57 -- of a decimal type with the given Scale, starting at S (P + 1), updating
58 -- P to point to the last character stored, the caller promises that the
59 -- buffer is large enough and no check is made for this. Constraint_Error
60 -- will not necessarily be raised if this requirement is violated, since
61 -- it is perfectly valid to compile this unit with checks off. The Fore,
62 -- Aft and Exp values can be set to any valid values for the case of use
63 -- by Text_IO.Decimal_IO.
65 procedure Set_Decimal_Digits
66 (Digs
: in out String;
74 -- This procedure has the same semantics as Set_Image_Decimal, except that
75 -- the value in Digs (1 .. NDigs) is given as a string of decimal digits
76 -- preceded by either a minus sign or a space (i.e. the integer image of
77 -- the value in units of delta). The call may destroy the value in Digs,
78 -- which is why Digs is in-out (this happens if rounding is required).
79 -- Set_Decimal_Digits is shared by all the decimal image routines.