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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ C H A R --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1992,1993,1994,1995 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
package body System.Img_Char is
---------------------
-- Image_Character --
---------------------
function Image_Character (V : Character) return String is
subtype Cname is String (1 .. 3);
S : Cname;
subtype C0_Range is Character
range Character'Val (16#00#) .. Character'Val (16#1F#);
C0 : constant array (C0_Range) of Cname :=
(Character'Val (16#00#) => "NUL",
Character'Val (16#01#) => "SOH",
Character'Val (16#02#) => "STX",
Character'Val (16#03#) => "ETX",
Character'Val (16#04#) => "EOT",
Character'Val (16#05#) => "ENQ",
Character'Val (16#06#) => "ACK",
Character'Val (16#07#) => "BEL",
Character'Val (16#08#) => "BS ",
Character'Val (16#09#) => "HT ",
Character'Val (16#0A#) => "LF ",
Character'Val (16#0B#) => "VT ",
Character'Val (16#0C#) => "FF ",
Character'Val (16#0D#) => "CR ",
Character'Val (16#0E#) => "SO ",
Character'Val (16#0F#) => "SI ",
Character'Val (16#10#) => "DLE",
Character'Val (16#11#) => "DC1",
Character'Val (16#12#) => "DC2",
Character'Val (16#13#) => "DC3",
Character'Val (16#14#) => "DC4",
Character'Val (16#15#) => "NAK",
Character'Val (16#16#) => "SYN",
Character'Val (16#17#) => "ETB",
Character'Val (16#18#) => "CAN",
Character'Val (16#19#) => "EM ",
Character'Val (16#1A#) => "SUB",
Character'Val (16#1B#) => "ESC",
Character'Val (16#1C#) => "FS ",
Character'Val (16#1D#) => "GS ",
Character'Val (16#1E#) => "RS ",
Character'Val (16#1F#) => "US ");
subtype C1_Range is Character
range Character'Val (16#7F#) .. Character'Val (16#9F#);
C1 : constant array (C1_Range) of Cname :=
(Character'Val (16#7F#) => "DEL",
Character'Val (16#80#) => "res",
Character'Val (16#81#) => "res",
Character'Val (16#82#) => "BPH",
Character'Val (16#83#) => "NBH",
Character'Val (16#84#) => "res",
Character'Val (16#85#) => "NEL",
Character'Val (16#86#) => "SSA",
Character'Val (16#87#) => "ESA",
Character'Val (16#88#) => "HTS",
Character'Val (16#89#) => "HTJ",
Character'Val (16#8A#) => "VTS",
Character'Val (16#8B#) => "PLD",
Character'Val (16#8C#) => "PLU",
Character'Val (16#8D#) => "RI ",
Character'Val (16#8E#) => "SS2",
Character'Val (16#8F#) => "SS3",
Character'Val (16#90#) => "DCS",
Character'Val (16#91#) => "PU1",
Character'Val (16#92#) => "PU2",
Character'Val (16#93#) => "STS",
Character'Val (16#94#) => "CCH",
Character'Val (16#95#) => "MW ",
Character'Val (16#96#) => "SPA",
Character'Val (16#97#) => "EPA",
Character'Val (16#98#) => "SOS",
Character'Val (16#99#) => "res",
Character'Val (16#9A#) => "SCI",
Character'Val (16#9B#) => "CSI",
Character'Val (16#9C#) => "ST ",
Character'Val (16#9D#) => "OSC",
Character'Val (16#9E#) => "PM ",
Character'Val (16#9F#) => "APC");
begin
-- Control characters are represented by their names (RM 3.5(32))
if V in C0_Range then
S := C0 (V);
if S (3) = ' ' then
return S (1 .. 2);
else
return S;
end if;
elsif V in C1_Range then
S := C1 (V);
if S (1) /= 'r' then
if S (3) = ' ' then
return S (1 .. 2);
else
return S;
end if;
-- Special case, res means RESERVED_nnn where nnn is the three digit
-- decimal value corresponding to the code position (more efficient
-- to compute than to store!)
else
declare
VP : constant Natural := Character'Pos (V);
St : String (1 .. 12) := "RESERVED_xxx";
begin
St (10) := Character'Val (48 + VP / 100);
St (11) := Character'Val (48 + (VP / 10) mod 10);
St (12) := Character'Val (48 + VP mod 10);
return St;
end;
end if;
-- Normal characters yield the character enlosed in quotes (RM 3.5(32))
else
S (1) := ''';
S (2) := V;
S (3) := ''';
return S;
end if;
end Image_Character;
end System.Img_Char;
|
