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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 -- A D A . D I R E C T O R I E S . V A L I D I T Y --
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6 -- --
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7 -- B o d y --
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8 -- (Windows Version) --
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9 -- --
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131
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10 -- Copyright (C) 2004-2018, Free Software Foundation, Inc. --
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111
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11 -- --
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12 -- GNAT is free software; you can redistribute it and/or modify it under --
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13 -- terms of the GNU General Public License as published by the Free Soft- --
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14 -- ware Foundation; either version 3, or (at your option) any later ver- --
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15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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17 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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18 -- --
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19 -- As a special exception under Section 7 of GPL version 3, you are granted --
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20 -- additional permissions described in the GCC Runtime Library Exception, --
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21 -- version 3.1, as published by the Free Software Foundation. --
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22 -- --
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23 -- You should have received a copy of the GNU General Public License and --
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24 -- a copy of the GCC Runtime Library Exception along with this program; --
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25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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26 -- <http://www.gnu.org/licenses/>. --
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27 -- --
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28 -- GNAT was originally developed by the GNAT team at New York University. --
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29 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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30 -- --
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31 ------------------------------------------------------------------------------
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32
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33 -- This is the Windows version of this package
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34
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35 with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
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36
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37 package body Ada.Directories.Validity is
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38
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39 Invalid_Character : constant array (Character) of Boolean :=
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40 (NUL .. US | '\' => True,
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41 '/' | ':' | '*' | '?' => True,
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42 '"' | '<' | '>' | '|' => True,
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43 DEL => True,
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44 others => False);
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45 -- Note that a valid file-name or path-name is implementation defined.
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46 -- To support UTF-8 file and directory names, we do not want to be too
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47 -- restrictive here.
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48
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49 ---------------------------------
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50 -- Is_Path_Name_Case_Sensitive --
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51 ---------------------------------
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52
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53 function Is_Path_Name_Case_Sensitive return Boolean is
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54 begin
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55 return False;
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56 end Is_Path_Name_Case_Sensitive;
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57
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58 ------------------------
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59 -- Is_Valid_Path_Name --
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60 ------------------------
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61
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62 function Is_Valid_Path_Name (Name : String) return Boolean is
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63 Start : Positive := Name'First;
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64 Last : Natural;
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65
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66 begin
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67 -- A path name cannot be empty, cannot contain more than 256 characters,
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68 -- cannot contain invalid characters and each directory/file name need
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69 -- to be valid.
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70
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71 if Name'Length = 0 or else Name'Length > 256 then
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72 return False;
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73
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74 else
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75 -- A drive letter may be specified at the beginning
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76
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77 if Name'Length >= 2
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78 and then Name (Start + 1) = ':'
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79 and then
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80 (Name (Start) in 'A' .. 'Z' or else Name (Start) in 'a' .. 'z')
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81 then
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82 Start := Start + 2;
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83
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84 -- A drive letter followed by a colon and followed by nothing or
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85 -- by a relative path is an ambiguous path name on Windows, so we
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86 -- don't accept it.
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87
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88 if Start > Name'Last
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89 or else (Name (Start) /= '/' and then Name (Start) /= '\')
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90 then
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91 return False;
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92 end if;
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93 end if;
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94
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95 loop
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96 -- Look for the start of the next directory or file name
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97
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98 while Start <= Name'Last
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99 and then (Name (Start) = '\' or Name (Start) = '/')
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100 loop
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101 Start := Start + 1;
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102 end loop;
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103
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104 -- If all directories/file names are OK, return True
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105
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106 exit when Start > Name'Last;
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107
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108 Last := Start;
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109
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110 -- Look for the end of the directory/file name
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111
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112 while Last < Name'Last loop
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113 exit when Name (Last + 1) = '\' or Name (Last + 1) = '/';
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114 Last := Last + 1;
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115 end loop;
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116
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117 -- Check if the directory/file name is valid
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118
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119 if not Is_Valid_Simple_Name (Name (Start .. Last)) then
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120 return False;
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121 end if;
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122
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123 -- Move to the next name
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124
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125 Start := Last + 1;
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126 end loop;
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127 end if;
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128
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129 -- If Name follows the rules, it is valid
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130
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131 return True;
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132 end Is_Valid_Path_Name;
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133
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134 --------------------------
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135 -- Is_Valid_Simple_Name --
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136 --------------------------
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137
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138 function Is_Valid_Simple_Name (Name : String) return Boolean is
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139 Only_Spaces : Boolean;
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140
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141 begin
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142 -- A file name cannot be empty, cannot contain more than 256 characters,
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143 -- and cannot contain invalid characters.
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144
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145 if Name'Length = 0 or else Name'Length > 256 then
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146 return False;
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147
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148 -- Name length is OK
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149
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150 else
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151 Only_Spaces := True;
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152 for J in Name'Range loop
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153 if Invalid_Character (Name (J)) then
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154 return False;
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155 elsif Name (J) /= ' ' then
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156 Only_Spaces := False;
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157 end if;
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158 end loop;
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159
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160 -- If no invalid chars, and not all spaces, file name is valid
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161
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162 return not Only_Spaces;
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163 end if;
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164 end Is_Valid_Simple_Name;
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165
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166 -------------
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167 -- Windows --
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168 -------------
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169
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170 function Windows return Boolean is
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171 begin
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172 return True;
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173 end Windows;
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174
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175 end Ada.Directories.Validity;
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