1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W C H _ W T S --
9 -- Copyright (C) 1992-1998 Free Software Foundation, Inc. --
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. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This package contains the routine used to convert wide strings to
35 -- strings for use by wide character attributes (value, image etc.) and
36 -- also by the numeric IO subpackages of Ada.Text_IO.Wide_Text_IO.
40 package System
.WCh_WtS
is
41 pragma Pure
(WCh_WtS
);
43 function Wide_String_To_String
45 EM
: System
.WCh_Con
.WC_Encoding_Method
)
47 -- This routine simply takes its argument and converts it to a string,
48 -- using the internal compiler escape sequence convention (defined in
49 -- package Widechar) to translate characters that are out of range
50 -- of type String. In the context of the Wide_Value attribute, the
51 -- argument is the original attribute argument, and the result is used
52 -- in a call to the corresponding Value attribute function. If the method
53 -- for encoding is a shift-in, shift-out convention, then it is assumed
54 -- that normal (non-wide character) mode holds at the start and end of
55 -- the result string. EM indicates the wide character encoding method.
56 -- Note: in the WCEM_Brackets case, we only use the brackets encoding
57 -- for characters greater than 16#FF#.