------------------------------------------------------------------------------
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                      S Y S T E M . I M G _ U T I L                       --
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------------------------------------------------------------------------------

--  This package provides some common utilities used by the s-imgxxx files

package System.Img_Util is
   pragma Pure;

   Max_Real_Image_Length : constant := 5200;
   --  If Exp is set to zero and Aft is set to Text_IO.Field'Last (i.e., 255)
   --  then Long_Long_Float'Last generates an image whose length is slightly
   --  less than 5200.

   procedure Set_Decimal_Digits
     (Digs  : in out String;
      NDigs : Natural;
      S     : out String;
      P     : in out Natural;
      Scale : Integer;
      Fore  : Natural;
      Aft   : Natural;
      Exp   : Natural);
   --  Sets the image of Digs (1 .. NDigs), which is a string of decimal digits
   --  preceded by either a minus sign or a space, i.e. the integer image of
   --  the value in units of delta if this is for a decimal fixed point type
   --  with the given Scale, or the integer image of the value converted to an
   --  implicit decimal fixed point type with the given Scale if this is for an
   --  ordinary fixed point type, starting at S (P + 1), updating P to point to
   --  the last character stored. The caller promises that the buffer is large
   --  enough and therefore no check is made for it. Constraint_Error will not
   --  necessarily be raised if the requirement is violated since it is valid
   --  to compile this unit with checks off. The Fore, Aft and Exp values can
   --  be set to any valid values for the case of use by Text_IO.Decimal_IO or
   --  Text_IO.Fixed_IO. Note that there is no leading space stored. The call
   --  may destroy the value in Digs, which is why Digs is in-out (this happens
   --  if rounding is required).

   type Floating_Invalid_Value is (Minus_Infinity, Infinity, Not_A_Number);

   procedure Set_Floating_Invalid_Value
     (V    : Floating_Invalid_Value;
      S    : out String;
      P    : in out Natural;
      Fore : Natural;
      Aft  : Natural;
      Exp  : Natural);
   --  Sets the image of a floating-point invalid value, starting at S (P + 1),
   --  updating P to point to the last character stored. The caller promises
   --  that the buffer is large enough and therefore no check is made for it.
   --  Constraint_Error will not necessarily be raised if the requirement is
   --  violated since it is valid to compile this unit with checks off.

end System.Img_Util;
