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-[NSFileManager fileSystemRepresentationWithPath:] not error safe - will

From: Roland Schwingel
Subject: -[NSFileManager fileSystemRepresentationWithPath:] not error safe - will crash on argument=nil
Date: Mon, 16 Sep 2002 11:53:42 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826


While migrating sources I found that fileSystemRepresentationWithPath: can not correctly handle arguments equal to nil so it will crash on win. (I am using base-1.5.0)
This method is quite frequently used in NSFileManager on many locations.

- (const char*) fileSystemRepresentationWithPath: (NSString*)path
#ifdef __MINGW__
  * If path is in Unix format, transmogrify it so Windows functions
  * can handle it
*/ NSString *newpath;
 const char    *c_path;
 int        l;

 path = [path stringByStandardizingPath];
 newpath = path;
 c_path = [path cString];
 l = strlen(c_path);

 if (c_path == 0)
     return 0;

If you supply nil for path it will crash in strlen() which is quite ugly.
I suggest to move
 l = strlen(c_path);

after the following if (c_path == 0) statement. So the method will correctly exit in this case.
(and bringing back OS4.2 behaviour).

What do you think? Is this change acceptable?


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