1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W C H _ W T S --
10 -- Copyright (C) 1992-1998 Free Software Foundation, Inc. --
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. --
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. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 -- This package contains the routine used to convert wide strings to
36 -- strings for use by wide character attributes (value, image etc.) and
37 -- also by the numeric IO subpackages of Ada.Text_IO.Wide_Text_IO.
41 package System.WCh_WtS is
42 pragma Pure (WCh_WtS);
44 function Wide_String_To_String
46 EM : System.WCh_Con.WC_Encoding_Method)
48 -- This routine simply takes its argument and converts it to a string,
49 -- using the internal compiler escape sequence convention (defined in
50 -- package Widechar) to translate characters that are out of range
51 -- of type String. In the context of the Wide_Value attribute, the
52 -- argument is the original attribute argument, and the result is used
53 -- in a call to the corresponding Value attribute function. If the method
54 -- for encoding is a shift-in, shift-out convention, then it is assumed
55 -- that normal (non-wide character) mode holds at the start and end of
56 -- the result string. EM indicates the wide character encoding method.
57 -- Note: in the WCEM_Brackets case, we only use the brackets encoding
58 -- for characters greater than 16#FF#.