check_args_within: Custom Search Specific Check
Description
Internal helper function for checking specific arguments
used in custom_search.
Usage
check_args_within(seconds, negate)
Arguments
seconds
An integer specifying the number of seconds to be used as
search criterion.
negate
If TRUE
, negates the search and seeks for
"NOT search_criterion". Default is FALSE
.
Value
NULL
if arguments are correct.