1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W C H _ S T W --
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 strings to wide
35 -- strings for use by wide character attributes (value, image etc.)
39 package System.WCh_StW is
40 pragma Pure (WCh_StW);
42 function String_To_Wide_String
44 EM : System.WCh_Con.WC_Encoding_Method)
46 -- This routine simply takes its argument and converts it to wide string
47 -- format. In the context of the Wide_Image attribute, the argument is
48 -- the corresponding 'Image attribute. Any wide character escape sequences
49 -- in the string are converted to the corresponding wide character value.
50 -- No syntax checks are made, it is assumed that any such sequences are
51 -- validly formed (this must be assured by the caller), and results from
52 -- the fact that Wide_Image is only used on strings that have been built
53 -- by the compiler, such as images of enumeration literals. 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 argument string. EM indicates the wide character encoding method.
57 -- Note: in the WCEM_Brackets case, the brackets escape sequence is used
58 -- only for codes greater than 16#FF#.