gcc/ada/g-stheme.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                   GNAT.SOCKETS.THIN.HOST_ERROR_MESSAGES                  --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                       Copyright (C) 2007, AdaCore                        --
  10 --                                                                          --
  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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  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.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the default implementation of this unit, providing explicit
  35 --  literal messages (we do not use hstrerror from the standard C library,
  36 --  as this function is obsolete).
  37
  38 separate (GNAT.Sockets.Thin)
  39 package body Host_Error_Messages is
  40
  41    package Messages is
  42       HOST_NOT_FOUND : aliased char_array := "Host not found" & nul;
  43       TRY_AGAIN      : aliased char_array := "Try again"      & nul;
  44       NO_RECOVERY    : aliased char_array := "No recovery"    & nul;
  45       NO_DATA        : aliased char_array := "No address"     & nul;
  46       Unknown_Error  : aliased char_array := "Unknown error"  & nul;
  47    end Messages;
  48
  49    function Host_Error_Message (H_Errno : Integer) return C.Strings.chars_ptr
  50    is
  51       use Interfaces.C.Strings;
  52       function TCP
  53         (P : char_array_access; Nul_Check : Boolean := False) return chars_ptr
  54         renames To_Chars_Ptr;
  55    begin
  56       case H_Errno is
  57          when Constants.HOST_NOT_FOUND =>
  58             return TCP (Messages.HOST_NOT_FOUND'Access);
  59
  60          when Constants.TRY_AGAIN      =>
  61             return TCP (Messages.TRY_AGAIN'Access);
  62
  63          when Constants.NO_RECOVERY    =>
  64             return TCP (Messages.NO_RECOVERY'Access);
  65
  66          when Constants.NO_DATA        =>
  67             return TCP (Messages.NO_DATA'Access);
  68
  69          when others                   =>
  70             return TCP (Messages.Unknown_Error'Access);
  71
  72       end case;
  73    end Host_Error_Message;
  74
  75 end Host_Error_Messages;