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283cb372e4
If the source path starts with the Win32 long path prefix '\\?\' or the NT object directory prefix '\??\', require the prefix to be followed by 'UNC\' or '<drive letter>:\'. Otherwise return EINVAL. This fixes the assertion failure in symlink_info::check that was reported here: https://cygwin.com/ml/cygwin/2019-09/msg00228.html That assertion failure was caused by normalize_win32_path returning a path with no backslashes when the source path was '\\?\DRIVE'.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin