gcc/ada/libgnat/s-imagen.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . I M A G E _ N                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --             Copyright (C) 2021-2023, Free Software Foundation, Inc.      --
  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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  Enumeration_Type'Image for all enumeration types except those in package
  33 --  Standard (where we have no opportunity to build image tables), and in
  34 --  package System (where it is too early to start building image tables).
  35 --  Special routines exist for the enumeration types in these packages.
  36
  37 generic
  38
  39    type Index_Type is range <>;
  40
  41 package System.Image_N is
  42    pragma Pure;
  43
  44    procedure Image_Enumeration
  45      (Pos     : Natural;
  46       S       : in out String;
  47       P       : out Natural;
  48       Names   : String;
  49       Indexes : System.Address);
  50    --  Used to compute Enum'Image (Str) where Enum is some enumeration type
  51    --  other than those defined in package Standard. Names is a string with
  52    --  a lower bound of 1 containing the characters of all the enumeration
  53    --  literals concatenated together in sequence. Indexes is the address of
  54    --  an array of type array (0 .. N) of Index_Type, where N is the number of
  55    --  enumeration literals in the type. The Indexes values are the starting
  56    --  subscript of each enumeration literal, indexed by Pos values, with an
  57    --  extra entry at the end containing Names'Length + 1. The reason that
  58    --  Indexes is passed by address is that the actual type is created on the
  59    --  fly by the expander. The desired 'Image value is stored in S (1 .. P)
  60    --  and P is set on return. The caller guarantees that S is long enough to
  61    --  hold the result and that the lower bound is 1.
  62
  63 end System.Image_N;