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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . W C H _ W T S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package contains the routine used to convert wide strings and wide
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33 -- wide strings to strings for use by wide and wide wide character attributes
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34 -- (value, image etc.) and also by the numeric IO subpackages of
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35 -- Ada.Text_IO.Wide_Text_IO and Ada.Text_IO.Wide_Wide_Text_IO.
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36
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37 with System.WCh_Con;
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38
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39 package System.WCh_WtS is
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40 pragma Pure;
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41
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42 function Wide_String_To_String
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43 (S : Wide_String;
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44 EM : System.WCh_Con.WC_Encoding_Method) return String;
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45 -- This routine simply takes its argument and converts it to a string,
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46 -- using the internal compiler escape sequence convention (defined in
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47 -- package Widechar) to translate characters that are out of range
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48 -- of type String. In the context of the Wide_Value attribute, the
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49 -- argument is the original attribute argument, and the result is used
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50 -- in a call to the corresponding Value attribute function. If the method
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51 -- for encoding is a shift-in, shift-out convention, then it is assumed
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52 -- that normal (non-wide character) mode holds at the start and end of
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53 -- the result string. EM indicates the wide character encoding method.
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54 -- Note: in the WCEM_Brackets case, we only use the brackets encoding
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55 -- for characters greater than 16#FF#. The lowest index of the returned
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56 -- String is equal to S'First.
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57
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58 function Wide_Wide_String_To_String
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59 (S : Wide_Wide_String;
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60 EM : System.WCh_Con.WC_Encoding_Method) return String;
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61 -- Same processing, except for Wide_Wide_String
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62
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63 end System.WCh_WtS;
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