cam: options: Fail parsing when non-option arguments are found

The options parser currently ignores non-option arguments silently,
which is confusing. It's a common error to run 'cam -c1 -C 10' and
expect only 10 frames to be captured. As the -C option takes an optional
argument, the number 10 is interpreted as a non-option argument instead
of the argument to the -C option.

Fail parsing with an appropriate message and print usage information
when a non-option argument is found. The parser may be extended later to
accept non-option arguments when the application has a use for them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

0 files changed, 0 insertions, 0 deletions