gcc/ada/a-dirval-vms.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --             A D A . D I R E C T O R I E S . V A L I D I T Y              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                              (VMS Version)                               --
   9 --                                                                          --
  10 --          Copyright (C) 2004-2009, 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 3,  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.                                     --
  18 --                                                                          --
  19 -- As a special exception under Section 7 of GPL version 3, you are granted --
  20 -- additional permissions described in the GCC Runtime Library Exception,   --
  21 -- version 3.1, as published by the Free Software Foundation.               --
  22 --                                                                          --
  23 -- You should have received a copy of the GNU General Public License and    --
  24 -- a copy of the GCC Runtime Library Exception along with this program;     --
  25 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  26 -- <http://www.gnu.org/licenses/>.                                          --
  27 --                                                                          --
  28 -- GNAT was originally developed  by the GNAT team at  New York University. --
  29 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  30 --                                                                          --
  31 ------------------------------------------------------------------------------
  32
  33 --  This is the OpenVMS version of this package
  34
  35 package body Ada.Directories.Validity is
  36
  37    Max_Number_Of_Characters : constant := 39;
  38    Max_Path_Length          : constant := 1_024;
  39
  40    Invalid_Character : constant array (Character) of Boolean :=
  41                          ('a' .. 'z' => False,
  42                           'A' .. 'Z' => False,
  43                           '0' .. '9' => False,
  44                           '_' | '$' | '-' | '.' => False,
  45                           others => True);
  46
  47    ---------------------------------
  48    -- Is_Path_Name_Case_Sensitive --
  49    ---------------------------------
  50
  51    function Is_Path_Name_Case_Sensitive return Boolean is
  52    begin
  53       return False;
  54    end Is_Path_Name_Case_Sensitive;
  55
  56    ------------------------
  57    -- Is_Valid_Path_Name --
  58    ------------------------
  59
  60    function Is_Valid_Path_Name (Name : String) return Boolean is
  61       First     : Positive := Name'First;
  62       Last      : Positive;
  63       Dot_Found : Boolean := False;
  64
  65    begin
  66       --  A valid path (directory) name cannot be empty, and cannot contain
  67       --  more than 1024 characters. Directories can be ".", ".." or be simple
  68       --  name without extensions.
  69
  70       if Name'Length = 0 or else Name'Length > Max_Path_Length then
  71          return False;
  72
  73       else
  74          loop
  75             --  Look for the start of the next directory or file name
  76
  77             while First <= Name'Last and then Name (First) = '/' loop
  78                First := First + 1;
  79             end loop;
  80
  81             --  If all directories/file names are OK, return True
  82
  83             exit when First > Name'Last;
  84
  85             Last := First;
  86             Dot_Found := False;
  87
  88             --  Look for the end of the directory/file name
  89
  90             while Last < Name'Last loop
  91                exit when Name (Last + 1) = '/';
  92                Last := Last + 1;
  93
  94                if Name (Last) = '.' then
  95                   Dot_Found := True;
  96                end if;
  97             end loop;
  98
  99             --  If name include a dot, it can only be ".", ".." or the last
 100             --  file name.
 101
 102             if Dot_Found then
 103                if Name (First .. Last) /= "." and then
 104                   Name (First .. Last) /= ".."
 105                then
 106                   return Last = Name'Last
 107                     and then Is_Valid_Simple_Name (Name (First .. Last));
 108
 109                end if;
 110
 111             --  Check if the directory/file name is valid
 112
 113             elsif not Is_Valid_Simple_Name (Name (First .. Last)) then
 114                   return False;
 115             end if;
 116
 117             --  Move to the next name
 118
 119             First := Last + 1;
 120          end loop;
 121       end if;
 122
 123       --  If Name follows the rules, then it is valid
 124
 125       return True;
 126    end Is_Valid_Path_Name;
 127
 128    --------------------------
 129    -- Is_Valid_Simple_Name --
 130    --------------------------
 131
 132    function Is_Valid_Simple_Name (Name : String) return Boolean is
 133       In_Extension         : Boolean := False;
 134       Number_Of_Characters : Natural := 0;
 135
 136    begin
 137       --  A file name cannot be empty, and cannot have more than 39 characters
 138       --  before or after a single '.'.
 139
 140       if Name'Length = 0 then
 141          return False;
 142
 143       else
 144          --  Check each character for validity
 145
 146          for J in Name'Range loop
 147             if Invalid_Character (Name (J)) then
 148                return False;
 149
 150             elsif Name (J) = '.' then
 151
 152                --  Name cannot contain several dots
 153
 154                if In_Extension then
 155                   return False;
 156
 157                else
 158                   --  Reset the number of characters to count the characters
 159                   --  of the extension.
 160
 161                   In_Extension := True;
 162                   Number_Of_Characters := 0;
 163                end if;
 164
 165             else
 166                --  Check that the number of character is not too large
 167
 168                Number_Of_Characters := Number_Of_Characters + 1;
 169
 170                if Number_Of_Characters > Max_Number_Of_Characters then
 171                   return False;
 172                end if;
 173             end if;
 174          end loop;
 175       end if;
 176
 177       --  If the rules are followed, then it is valid
 178
 179       return True;
 180    end Is_Valid_Simple_Name;
 181
 182    -------------
 183    -- OpenVMS --
 184    -------------
 185
 186    function OpenVMS return Boolean is
 187    begin
 188       return True;
 189    end OpenVMS;
 190
 191    -------------
 192    -- Windows --
 193    -------------
 194
 195    function Windows return Boolean is
 196    begin
 197       return False;
 198    end Windows;
 199
 200 end Ada.Directories.Validity;