gcc/ada/s-imgcha.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ C H A R                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --     Copyright (C) 1992,1993,1994,1995 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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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_Char is
  35
  36    ---------------------
  37    -- Image_Character --
  38    ---------------------
  39
  40    function Image_Character (V : Character) return String is
  41       subtype Cname is String (1 .. 3);
  42
  43       S : Cname;
  44
  45       subtype C0_Range is Character
  46         range Character'Val (16#00#) .. Character'Val (16#1F#);
  47
  48       C0 : constant array (C0_Range) of Cname :=
  49               (Character'Val (16#00#) => "NUL",
  50                Character'Val (16#01#) => "SOH",
  51                Character'Val (16#02#) => "STX",
  52                Character'Val (16#03#) => "ETX",
  53                Character'Val (16#04#) => "EOT",
  54                Character'Val (16#05#) => "ENQ",
  55                Character'Val (16#06#) => "ACK",
  56                Character'Val (16#07#) => "BEL",
  57                Character'Val (16#08#) => "BS ",
  58                Character'Val (16#09#) => "HT ",
  59                Character'Val (16#0A#) => "LF ",
  60                Character'Val (16#0B#) => "VT ",
  61                Character'Val (16#0C#) => "FF ",
  62                Character'Val (16#0D#) => "CR ",
  63                Character'Val (16#0E#) => "SO ",
  64                Character'Val (16#0F#) => "SI ",
  65                Character'Val (16#10#) => "DLE",
  66                Character'Val (16#11#) => "DC1",
  67                Character'Val (16#12#) => "DC2",
  68                Character'Val (16#13#) => "DC3",
  69                Character'Val (16#14#) => "DC4",
  70                Character'Val (16#15#) => "NAK",
  71                Character'Val (16#16#) => "SYN",
  72                Character'Val (16#17#) => "ETB",
  73                Character'Val (16#18#) => "CAN",
  74                Character'Val (16#19#) => "EM ",
  75                Character'Val (16#1A#) => "SUB",
  76                Character'Val (16#1B#) => "ESC",
  77                Character'Val (16#1C#) => "FS ",
  78                Character'Val (16#1D#) => "GS ",
  79                Character'Val (16#1E#) => "RS ",
  80                Character'Val (16#1F#) => "US ");
  81
  82       subtype C1_Range is Character
  83         range Character'Val (16#7F#) .. Character'Val (16#9F#);
  84
  85       C1 : constant array (C1_Range) of Cname :=
  86               (Character'Val (16#7F#) => "DEL",
  87                Character'Val (16#80#) => "res",
  88                Character'Val (16#81#) => "res",
  89                Character'Val (16#82#) => "BPH",
  90                Character'Val (16#83#) => "NBH",
  91                Character'Val (16#84#) => "res",
  92                Character'Val (16#85#) => "NEL",
  93                Character'Val (16#86#) => "SSA",
  94                Character'Val (16#87#) => "ESA",
  95                Character'Val (16#88#) => "HTS",
  96                Character'Val (16#89#) => "HTJ",
  97                Character'Val (16#8A#) => "VTS",
  98                Character'Val (16#8B#) => "PLD",
  99                Character'Val (16#8C#) => "PLU",
 100                Character'Val (16#8D#) => "RI ",
 101                Character'Val (16#8E#) => "SS2",
 102                Character'Val (16#8F#) => "SS3",
 103                Character'Val (16#90#) => "DCS",
 104                Character'Val (16#91#) => "PU1",
 105                Character'Val (16#92#) => "PU2",
 106                Character'Val (16#93#) => "STS",
 107                Character'Val (16#94#) => "CCH",
 108                Character'Val (16#95#) => "MW ",
 109                Character'Val (16#96#) => "SPA",
 110                Character'Val (16#97#) => "EPA",
 111                Character'Val (16#98#) => "SOS",
 112                Character'Val (16#99#) => "res",
 113                Character'Val (16#9A#) => "SCI",
 114                Character'Val (16#9B#) => "CSI",
 115                Character'Val (16#9C#) => "ST ",
 116                Character'Val (16#9D#) => "OSC",
 117                Character'Val (16#9E#) => "PM ",
 118                Character'Val (16#9F#) => "APC");
 119
 120    begin
 121       --  Control characters are represented by their names (RM 3.5(32))
 122
 123       if V in C0_Range then
 124          S := C0 (V);
 125
 126          if S (3) = ' ' then
 127             return S (1 .. 2);
 128          else
 129             return S;
 130          end if;
 131
 132       elsif V in C1_Range then
 133          S := C1 (V);
 134
 135          if S (1) /= 'r' then
 136             if S (3) = ' ' then
 137                return S (1 .. 2);
 138             else
 139                return S;
 140             end if;
 141
 142          --  Special case, res means RESERVED_nnn where nnn is the three digit
 143          --  decimal value corresponding to the code position (more efficient
 144          --  to compute than to store!)
 145
 146          else
 147             declare
 148                VP : constant Natural := Character'Pos (V);
 149                St : String (1 .. 12) := "RESERVED_xxx";
 150
 151             begin
 152                St (10) := Character'Val (48 + VP / 100);
 153                St (11) := Character'Val (48 + (VP / 10) mod 10);
 154                St (12) := Character'Val (48 + VP mod 10);
 155                return St;
 156             end;
 157          end if;
 158
 159       --  Normal characters yield the character enlosed in quotes (RM 3.5(32))
 160
 161       else
 162          S (1) := ''';
 163          S (2) := V;
 164          S (3) := ''';
 165          return S;
 166       end if;
 167    end Image_Character;
 168
 169 end System.Img_Char;