gcc/ada/s-imgint.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . I M G _ I N T                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2013, Free Software Foundation, Inc.         --
  10 --                                                                          --
  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 3,  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.                                     --
  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.               --
  21 --                                                                          --
  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 package body System.Img_Int is
  33
  34    -------------------
  35    -- Image_Integer --
  36    -------------------
  37
  38    procedure Image_Integer
  39      (V : Integer;
  40       S : in out String;
  41       P : out Natural)
  42    is
  43       pragma Assert (S'First = 1);
  44
  45    begin
  46       if V >= 0 then
  47          S (1) := ' ';
  48          P := 1;
  49       else
  50          P := 0;
  51       end if;
  52
  53       Set_Image_Integer (V, S, P);
  54    end Image_Integer;
  55
  56    -----------------------
  57    -- Set_Image_Integer --
  58    -----------------------
  59
  60    procedure Set_Image_Integer
  61      (V : Integer;
  62       S : in out String;
  63       P : in out Natural)
  64    is
  65       procedure Set_Digits (T : Integer);
  66       --  Set digits of absolute value of T, which is zero or negative. We work
  67       --  with the negative of the value so that the largest negative number is
  68       --  not a special case.
  69
  70       ----------------
  71       -- Set_Digits --
  72       ----------------
  73
  74       procedure Set_Digits (T : Integer) is
  75       begin
  76          if T <= -10 then
  77             Set_Digits (T / 10);
  78             P := P + 1;
  79             S (P) := Character'Val (48 - (T rem 10));
  80          else
  81             P := P + 1;
  82             S (P) := Character'Val (48 - T);
  83          end if;
  84       end Set_Digits;
  85
  86    --  Start of processing for Set_Image_Integer
  87
  88    begin
  89       if V >= 0 then
  90          Set_Digits (-V);
  91       else
  92          P := P + 1;
  93          S (P) := '-';
  94          Set_Digits (V);
  95       end if;
  96    end Set_Image_Integer;
  97
  98 end System.Img_Int;