gcc/ada/s-imgint.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                       S Y S T E M . I M G _ I N T                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 package body System.Img_Int is
  36
  37    -------------------
  38    -- Image_Integer --
  39    -------------------
  40
  41    function Image_Integer (V : Integer) return String is
  42       P : Natural;
  43       S : String (1 .. Integer'Width);
  44
  45    begin
  46       if V >= 0 then
  47          P := 1;
  48          S (P) := ' ';
  49       else
  50          P := 0;
  51       end if;
  52
  53       Set_Image_Integer (V, S, P);
  54       return S (1 .. P);
  55    end Image_Integer;
  56
  57    -----------------------
  58    -- Set_Image_Integer --
  59    -----------------------
  60
  61    procedure Set_Image_Integer
  62      (V  : Integer;
  63       S  : out String;
  64       P  : in out Natural)
  65    is
  66       procedure Set_Digits (T : Integer);
  67       --  Set digits of absolute value of T, which is zero or negative. We work
  68       --  with the negative of the value so that the largest negative number is
  69       --  not a special case.
  70
  71       procedure Set_Digits (T : Integer) is
  72       begin
  73          if T <= -10 then
  74             Set_Digits (T / 10);
  75             P := P + 1;
  76             S (P) := Character'Val (48 - (T rem 10));
  77
  78          else
  79             P := P + 1;
  80             S (P) := Character'Val (48 - T);
  81          end if;
  82       end Set_Digits;
  83
  84    --  Start of processing for Set_Image_Integer
  85
  86    begin
  87       if V >= 0 then
  88          Set_Digits (-V);
  89
  90       else
  91          P := P + 1;
  92          S (P) := '-';
  93          Set_Digits (V);
  94       end if;
  95    end Set_Image_Integer;
  96
  97 end System.Img_Int;