bug#7450: cp does not check for errno=EISDIR when target is dangling link

[Марк Коренберг]

How to reproduce:

$ ln -s non-exist tgt
$ cp /etc/passwd tgt
cp: not writing through dangling symlink `tgt'

As we see, cp know, that if retval EEXIST and target is symlink,
special responce given.

Now, try to add slash at the end of target:

$ cp /etc/passwd tgt/
cp: cannot create regular file `tgt/': Is a directory

Novices can not understand this message :)

cp should check if (target is symlink and error is EISDIR) and report
message like this:
cp: Trying to use dangling symlink `tgt' as a directory

-- 
Segmentation fault