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) 1992-2007, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  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 package body System.Img_Int is
  35
  36    -------------------
  37    -- Image_Integer --
  38    -------------------
  39
  40    procedure Image_Integer
  41      (V : Integer;
  42       S : in out String;
  43       P : out Natural)
  44    is
  45       pragma Assert (S'First = 1);
  46
  47       procedure Set_Digits (T : Integer);
  48       --  Set digits of absolute value of T, which is zero or negative. We work
  49       --  with the negative of the value so that the largest negative number is
  50       --  not a special case.
  51
  52       ----------------
  53       -- Set_Digits --
  54       ----------------
  55
  56       procedure Set_Digits (T : Integer) is
  57       begin
  58          if T <= -10 then
  59             Set_Digits (T / 10);
  60             P := P + 1;
  61             S (P) := Character'Val (48 - (T rem 10));
  62          else
  63             P := P + 1;
  64             S (P) := Character'Val (48 - T);
  65          end if;
  66       end Set_Digits;
  67
  68    --  Start of processing for Image_Integer
  69
  70    begin
  71       P := 1;
  72
  73       if V >= 0 then
  74          S (P) := ' ';
  75          Set_Digits (-V);
  76       else
  77          S (P) := '-';
  78          Set_Digits (V);
  79       end if;
  80    end Image_Integer;
  81
  82    -----------------------
  83    -- Set_Image_Integer --
  84    -----------------------
  85
  86    procedure Set_Image_Integer
  87      (V : Integer;
  88       S : in out String;
  89       P : in out Natural)
  90    is
  91       procedure Set_Digits (T : Integer);
  92       --  Set digits of absolute value of T, which is zero or negative. We work
  93       --  with the negative of the value so that the largest negative number is
  94       --  not a special case.
  95
  96       ----------------
  97       -- Set_Digits --
  98       ----------------
  99
 100       procedure Set_Digits (T : Integer) is
 101       begin
 102          if T <= -10 then
 103             Set_Digits (T / 10);
 104             P := P + 1;
 105             S (P) := Character'Val (48 - (T rem 10));
 106          else
 107             P := P + 1;
 108             S (P) := Character'Val (48 - T);
 109          end if;
 110       end Set_Digits;
 111
 112    --  Start of processing for Set_Image_Integer
 113
 114    begin
 115       if V >= 0 then
 116          Set_Digits (-V);
 117       else
 118          P := P + 1;
 119          S (P) := '-';
 120          Set_Digits (V);
 121       end if;
 122    end Set_Image_Integer;
 123
 124 end System.Img_Int;