X-Git-Url: http://git.sourceforge.jp/view?p=shogi-server%2Fshogi-server.git;a=blobdiff_plain;f=shogi_server%2Futil.rb;h=ebf8c9d1148b9f472a05bff579862052478c2993;hp=b3141e6dbc997de610767c23de4126d25b362150;hb=3c5c117c78c14049e32df336a0a4105a4e3a9ead;hpb=d31194521135876378c1a02abe2b66b783a7a30c

diff --git a/shogi_server/util.rb b/shogi_server/util.rb
index b3141e6..ebf8c9d 100644
--- a/shogi_server/util.rb
+++ b/shogi_server/util.rb
@@ -17,11 +17,14 @@
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+require 'fileutils'
+require 'pathname'
+
 module ShogiServer
 
   # Generate a random number such as i<=n<max
   def random(i, max)
-    raise if i >= max
+    return i if i >= max
     return rand(max-i)+i
   end
   module_function :random
@@ -37,4 +40,31 @@ module ShogiServer
   end
   module_function :shuffle
 
+  # See if the file is writable. The file will be created if it does not exist
+  # yet.
+  # Return true if the file is writable, otherwise false.
+  #
+  def is_writable_file?(file)
+    if String === file
+      file = Pathname.new file
+    end
+    if file.exist?
+      if file.file?
+        return file.writable_real?
+      else
+        return false
+      end
+    end
+    
+    begin
+      file.open("w") {|fh| } 
+      file.delete
+    rescue
+      return false
+    end
+
+    return true
+  end
+  module_function :is_writable_file?
+
 end