gcc/ada/s-wchstw.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                       S Y S T E M . W C H _ S T W                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-1998 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 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This package contains the routine used to convert strings to wide
  36 --  strings for use by wide character attributes (value, image etc.)
  37
  38 with System.WCh_Con;
  39
  40 package System.WCh_StW is
  41 pragma Pure (WCh_StW);
  42
  43    function String_To_Wide_String
  44      (S    : String;
  45       EM   : System.WCh_Con.WC_Encoding_Method)
  46       return Wide_String;
  47    --  This routine simply takes its argument and converts it to wide string
  48    --  format. In the context of the Wide_Image attribute, the argument is
  49    --  the corresponding 'Image attribute. Any wide character escape sequences
  50    --  in the string are converted to the corresponding wide character value.
  51    --  No syntax checks are made, it is assumed that any such sequences are
  52    --  validly formed (this must be assured by the caller), and results from
  53    --  the fact that Wide_Image is only used on strings that have been built
  54    --  by the compiler, such as images of enumeration literals. If the method
  55    --  for encoding is a shift-in, shift-out convention, then it is assumed
  56    --  that normal (non-wide character) mode holds at the start and end of
  57    --  the argument string. EM indicates the wide character encoding method.
  58    --  Note: in the WCEM_Brackets case, the brackets escape sequence is used
  59    --  only for codes greater than 16#FF#.
  60
  61 end System.WCh_StW;