gcc/ada/s-imgdec.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . I M G _ D E C                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
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  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
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  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  Image for decimal fixed types where the size of the corresponding integer
  33 --  type does not exceed Integer'Size (also used for Text_IO.Decimal_IO output)
  34
  35 package System.Img_Dec is
  36    pragma Pure;
  37
  38    procedure Image_Decimal
  39      (V     : Integer;
  40       S     : in out String;
  41       P     : out Natural;
  42       Scale : Integer);
  43    --  Computes fixed_type'Image (V), where V is the integer value (in units of
  44    --  delta) of a decimal type whose Scale is as given and stores the result
  45    --  S (1 .. P), updating P to the value of L. The image is given by the
  46    --  rules in RM 3.5(34) for fixed-point type image functions. The caller
  47    --  guarantees that S is long enough to hold the result. S need not have a
  48    --  lower bound of 1.
  49
  50    procedure Set_Image_Decimal
  51      (V     : Integer;
  52       S     : in out String;
  53       P     : in out Natural;
  54       Scale : Integer;
  55       Fore  : Natural;
  56       Aft   : Natural;
  57       Exp   : Natural);
  58    --  Sets the image of V, where V is the integer value (in units of delta)
  59    --  of a decimal type with the given Scale, starting at S (P + 1), updating
  60    --  P to point to the last character stored, the caller promises that the
  61    --  buffer is large enough and no check is made for this. Constraint_Error
  62    --  will not necessarily be raised if this requirement is violated, since
  63    --  it is perfectly valid to compile this unit with checks off. The Fore,
  64    --  Aft and Exp values can be set to any valid values for the case of use
  65    --  by Text_IO.Decimal_IO. Note that there is no leading space stored.
  66
  67    procedure Set_Decimal_Digits
  68      (Digs  : in out String;
  69       NDigs : Natural;
  70       S     : out String;
  71       P     : in out Natural;
  72       Scale : Integer;
  73       Fore  : Natural;
  74       Aft   : Natural;
  75       Exp   : Natural);
  76    --  This procedure has the same semantics as Set_Image_Decimal, except that
  77    --  the value in Digs (1 .. NDigs) is given as a string of decimal digits
  78    --  preceded by either a minus sign or a space (i.e. the integer image of
  79    --  the value in units of delta). The call may destroy the value in Digs,
  80    --  which is why Digs is in-out (this happens if rounding is required).
  81    --  Set_Decimal_Digits is shared by all the decimal image routines.
  82
  83 end System.Img_Dec;