K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2011-03-06T22:59:30.260661Z
K 7
svn:log
V 356
The execution of the shebang script requires putting interpreter path,
possible option and script path in the place of argv[0] supplied to
execve(2).  It is possible and valid for the substitution to be shorter
then the argv[0].

Avoid signed underflow in this case.

Submitted by:	Devon H. O'Dell <devon.odell gmail com>
PR:	kern/155321
MFC after:	1 week

END