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) 1992-2007, 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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  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  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)
  36
  37 package System.Img_Dec is
  38    pragma Pure;
  39
  40    procedure Image_Decimal
  41      (V     : Integer;
  42       S     : in out String;
  43       P     : out Natural;
  44       Scale : Integer);
  45    --  Computes fixed_type'Image (V), where V is the integer value (in units of
  46    --  delta) of a decimal type whose Scale is as given and stores the result
  47    --  S (1 .. P), updating P to the value of L. The image is given by the
  48    --  rules in RM 3.5(34) for fixed-point type image functions. The caller
  49    --  guarantees that S is long enough to hold the result. S need not have a
  50    --  lower bound of 1.
  51
  52    procedure Set_Image_Decimal
  53      (V     : Integer;
  54       S     : in out String;
  55       P     : in out Natural;
  56       Scale : Integer;
  57       Fore  : Natural;
  58       Aft   : Natural;
  59       Exp   : Natural);
  60    --  Sets the image of V, where V is the integer value (in units of delta)
  61    --  of a decimal type with the given Scale, starting at S (P + 1), updating
  62    --  P to point to the last character stored, the caller promises that the
  63    --  buffer is large enough and no check is made for this. Constraint_Error
  64    --  will not necessarily be raised if this requirement is violated, since
  65    --  it is perfectly valid to compile this unit with checks off. The Fore,
  66    --  Aft and Exp values can be set to any valid values for the case of use
  67    --  by Text_IO.Decimal_IO. Note that there is no leading space stored.
  68
  69    procedure Set_Decimal_Digits
  70      (Digs  : in out String;
  71       NDigs : Natural;
  72       S     : out String;
  73       P     : in out Natural;
  74       Scale : Integer;
  75       Fore  : Natural;
  76       Aft   : Natural;
  77       Exp   : Natural);
  78    --  This procedure has the same semantics as Set_Image_Decimal, except that
  79    --  the value in Digs (1 .. NDigs) is given as a string of decimal digits
  80    --  preceded by either a minus sign or a space (i.e. the integer image of
  81    --  the value in units of delta). The call may destroy the value in Digs,
  82    --  which is why Digs is in-out (this happens if rounding is required).
  83    --  Set_Decimal_Digits is shared by all the decimal image routines.
  84
  85 end System.Img_Dec;