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 --                                                                          --
  10 --     Copyright (C) 1992,1993,1994,1995 Free Software Foundation, Inc.     --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 package body System.Img_Char is
  36
  37    ---------------------
  38    -- Image_Character --
  39    ---------------------
  40
  41    function Image_Character (V : Character) return String is
  42       subtype Cname is String (1 .. 3);
  43
  44       S : Cname;
  45
  46       subtype C0_Range is Character
  47         range Character'Val (16#00#) .. Character'Val (16#1F#);
  48
  49       C0 : constant array (C0_Range) of Cname :=
  50               (Character'Val (16#00#) => "NUL",
  51                Character'Val (16#01#) => "SOH",
  52                Character'Val (16#02#) => "STX",
  53                Character'Val (16#03#) => "ETX",
  54                Character'Val (16#04#) => "EOT",
  55                Character'Val (16#05#) => "ENQ",
  56                Character'Val (16#06#) => "ACK",
  57                Character'Val (16#07#) => "BEL",
  58                Character'Val (16#08#) => "BS ",
  59                Character'Val (16#09#) => "HT ",
  60                Character'Val (16#0A#) => "LF ",
  61                Character'Val (16#0B#) => "VT ",
  62                Character'Val (16#0C#) => "FF ",
  63                Character'Val (16#0D#) => "CR ",
  64                Character'Val (16#0E#) => "SO ",
  65                Character'Val (16#0F#) => "SI ",
  66                Character'Val (16#10#) => "DLE",
  67                Character'Val (16#11#) => "DC1",
  68                Character'Val (16#12#) => "DC2",
  69                Character'Val (16#13#) => "DC3",
  70                Character'Val (16#14#) => "DC4",
  71                Character'Val (16#15#) => "NAK",
  72                Character'Val (16#16#) => "SYN",
  73                Character'Val (16#17#) => "ETB",
  74                Character'Val (16#18#) => "CAN",
  75                Character'Val (16#19#) => "EM ",
  76                Character'Val (16#1A#) => "SUB",
  77                Character'Val (16#1B#) => "ESC",
  78                Character'Val (16#1C#) => "FS ",
  79                Character'Val (16#1D#) => "GS ",
  80                Character'Val (16#1E#) => "RS ",
  81                Character'Val (16#1F#) => "US ");
  82
  83       subtype C1_Range is Character
  84         range Character'Val (16#7F#) .. Character'Val (16#9F#);
  85
  86       C1 : constant array (C1_Range) of Cname :=
  87               (Character'Val (16#7F#) => "DEL",
  88                Character'Val (16#80#) => "res",
  89                Character'Val (16#81#) => "res",
  90                Character'Val (16#82#) => "BPH",
  91                Character'Val (16#83#) => "NBH",
  92                Character'Val (16#84#) => "res",
  93                Character'Val (16#85#) => "NEL",
  94                Character'Val (16#86#) => "SSA",
  95                Character'Val (16#87#) => "ESA",
  96                Character'Val (16#88#) => "HTS",
  97                Character'Val (16#89#) => "HTJ",
  98                Character'Val (16#8A#) => "VTS",
  99                Character'Val (16#8B#) => "PLD",
 100                Character'Val (16#8C#) => "PLU",
 101                Character'Val (16#8D#) => "RI ",
 102                Character'Val (16#8E#) => "SS2",
 103                Character'Val (16#8F#) => "SS3",
 104                Character'Val (16#90#) => "DCS",
 105                Character'Val (16#91#) => "PU1",
 106                Character'Val (16#92#) => "PU2",
 107                Character'Val (16#93#) => "STS",
 108                Character'Val (16#94#) => "CCH",
 109                Character'Val (16#95#) => "MW ",
 110                Character'Val (16#96#) => "SPA",
 111                Character'Val (16#97#) => "EPA",
 112                Character'Val (16#98#) => "SOS",
 113                Character'Val (16#99#) => "res",
 114                Character'Val (16#9A#) => "SCI",
 115                Character'Val (16#9B#) => "CSI",
 116                Character'Val (16#9C#) => "ST ",
 117                Character'Val (16#9D#) => "OSC",
 118                Character'Val (16#9E#) => "PM ",
 119                Character'Val (16#9F#) => "APC");
 120
 121    begin
 122       --  Control characters are represented by their names (RM 3.5(32))
 123
 124       if V in C0_Range then
 125          S := C0 (V);
 126
 127          if S (3) = ' ' then
 128             return S (1 .. 2);
 129          else
 130             return S;
 131          end if;
 132
 133       elsif V in C1_Range then
 134          S := C1 (V);
 135
 136          if S (1) /= 'r' then
 137             if S (3) = ' ' then
 138                return S (1 .. 2);
 139             else
 140                return S;
 141             end if;
 142
 143          --  Special case, res means RESERVED_nnn where nnn is the three digit
 144          --  decimal value corresponding to the code position (more efficient
 145          --  to compute than to store!)
 146
 147          else
 148             declare
 149                VP : constant Natural := Character'Pos (V);
 150                St : String (1 .. 12) := "RESERVED_xxx";
 151
 152             begin
 153                St (10) := Character'Val (48 + VP / 100);
 154                St (11) := Character'Val (48 + (VP / 10) mod 10);
 155                St (12) := Character'Val (48 + VP mod 10);
 156                return St;
 157             end;
 158          end if;
 159
 160       --  Normal characters yield the character enlosed in quotes (RM 3.5(32))
 161
 162       else
 163          S (1) := ''';
 164          S (2) := V;
 165          S (3) := ''';
 166          return S;
 167       end if;
 168    end Image_Character;
 169
 170 end System.Img_Char;