gcc/ada/s-imgllw.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . I M G _ L L W                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2014, 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 with System.Unsigned_Types; use System.Unsigned_Types;
  33
  34 package body System.Img_LLW is
  35
  36    ---------------------------------------
  37    -- Set_Image_Width_Long_Long_Integer --
  38    ---------------------------------------
  39
  40    procedure Set_Image_Width_Long_Long_Integer
  41      (V : Long_Long_Integer;
  42       W : Integer;
  43       S : out String;
  44       P : in out Natural)
  45    is
  46       Start : Natural;
  47
  48    begin
  49       --  Positive case can just use the unsigned circuit directly
  50
  51       if V >= 0 then
  52          Set_Image_Width_Long_Long_Unsigned
  53            (Long_Long_Unsigned (V), W, S, P);
  54
  55       --  Negative case has to set a minus sign. Note also that we have to be
  56       --  careful not to generate overflow with the largest negative number.
  57
  58       else
  59          P := P + 1;
  60          S (P) := ' ';
  61          Start := P;
  62
  63          declare
  64             pragma Suppress (Overflow_Check);
  65             pragma Suppress (Range_Check);
  66          begin
  67             Set_Image_Width_Long_Long_Unsigned
  68               (Long_Long_Unsigned (-V), W - 1, S, P);
  69          end;
  70
  71          --  Set minus sign in last leading blank location. Because of the
  72          --  code above, there must be at least one such location.
  73
  74          while S (Start + 1) = ' ' loop
  75             Start := Start + 1;
  76          end loop;
  77
  78          S (Start) := '-';
  79       end if;
  80
  81    end Set_Image_Width_Long_Long_Integer;
  82
  83    ----------------------------------------
  84    -- Set_Image_Width_Long_Long_Unsigned --
  85    ----------------------------------------
  86
  87    procedure Set_Image_Width_Long_Long_Unsigned
  88      (V : Long_Long_Unsigned;
  89       W : Integer;
  90       S : out String;
  91       P : in out Natural)
  92    is
  93       Start : constant Natural := P;
  94       F, T  : Natural;
  95
  96       procedure Set_Digits (T : Long_Long_Unsigned);
  97       --  Set digits of absolute value of T
  98
  99       ----------------
 100       -- Set_Digits --
 101       ----------------
 102
 103       procedure Set_Digits (T : Long_Long_Unsigned) is
 104       begin
 105          if T >= 10 then
 106             Set_Digits (T / 10);
 107             P := P + 1;
 108             S (P) := Character'Val (T mod 10 + Character'Pos ('0'));
 109          else
 110             P := P + 1;
 111             S (P) := Character'Val (T + Character'Pos ('0'));
 112          end if;
 113       end Set_Digits;
 114
 115    --  Start of processing for Set_Image_Width_Long_Long_Unsigned
 116
 117    begin
 118       Set_Digits (V);
 119
 120       --  Add leading spaces if required by width parameter
 121
 122       if P - Start < W then
 123          F := P;
 124          P := P + (W - (P - Start));
 125          T := P;
 126
 127          while F > Start loop
 128             S (T) := S (F);
 129             T := T - 1;
 130             F := F - 1;
 131          end loop;
 132
 133          for J in Start + 1 .. T loop
 134             S (J) := ' ';
 135          end loop;
 136       end if;
 137
 138    end Set_Image_Width_Long_Long_Unsigned;
 139
 140 end System.Img_LLW;