Comment 5 for bug 263014

I have run into the same issue with realpath().

I don't know whether PATH_MAX available on all platforms that Firefox needs to support, but the value 1024 is a very bad choice for default. Accordingly man for realpath(), the size of the buffer for it is defined as:

              #ifdef PATH_MAX
                path_max = PATH_MAX;
              #else
                path_max = pathconf (path, _PC_PATH_MAX);
                if (path_max <= 0)
                  path_max = 4096;
              #endif

So, 4096 would be much better value.

Besides, the definition of MAXPATHLEN is inconsistent. In nsXPCOMPrivate.h,
it uses PATH_MAX when it is available
http://mxr.mozilla.org/mozilla1.8/source/xpcom/build/nsXPCOMPrivate.h#248
but, in many other places, it does not...

IMHO, it would be better if MAXPATHLEN was defined as PATH_MAX when the latter is available... At least, this closes the problem for those platforms that have PATH_MAX defined.