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) 1992-2009, 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       procedure Set_Digits (T : Integer);
  46       --  Set digits of absolute value of T, which is zero or negative. We work
  47       --  with the negative of the value so that the largest negative number is
  48       --  not a special case.
  49
  50       ----------------
  51       -- Set_Digits --
  52       ----------------
  53
  54       procedure Set_Digits (T : Integer) is
  55       begin
  56          if T <= -10 then
  57             Set_Digits (T / 10);
  58             P := P + 1;
  59             S (P) := Character'Val (48 - (T rem 10));
  60          else
  61             P := P + 1;
  62             S (P) := Character'Val (48 - T);
  63          end if;
  64       end Set_Digits;
  65
  66    --  Start of processing for Image_Integer
  67
  68    begin
  69       P := 1;
  70
  71       if V >= 0 then
  72          S (P) := ' ';
  73          Set_Digits (-V);
  74       else
  75          S (P) := '-';
  76          Set_Digits (V);
  77       end if;
  78    end Image_Integer;
  79
  80    -----------------------
  81    -- Set_Image_Integer --
  82    -----------------------
  83
  84    procedure Set_Image_Integer
  85      (V : Integer;
  86       S : in out String;
  87       P : in out Natural)
  88    is
  89       procedure Set_Digits (T : Integer);
  90       --  Set digits of absolute value of T, which is zero or negative. We work
  91       --  with the negative of the value so that the largest negative number is
  92       --  not a special case.
  93
  94       ----------------
  95       -- Set_Digits --
  96       ----------------
  97
  98       procedure Set_Digits (T : Integer) is
  99       begin
 100          if T <= -10 then
 101             Set_Digits (T / 10);
 102             P := P + 1;
 103             S (P) := Character'Val (48 - (T rem 10));
 104          else
 105             P := P + 1;
 106             S (P) := Character'Val (48 - T);
 107          end if;
 108       end Set_Digits;
 109
 110    --  Start of processing for Set_Image_Integer
 111
 112    begin
 113       if V >= 0 then
 114          Set_Digits (-V);
 115       else
 116          P := P + 1;
 117          S (P) := '-';
 118          Set_Digits (V);
 119       end if;
 120    end Set_Image_Integer;
 121
 122 end System.Img_Int;