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cam: Separate options valid() and empty()

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An empty option list is not necessarily an error. Add a new empty()
function to test the option list for emptiness, and modify the valid()
function to only notify parsing errors. As a side effect this allows
accessing partially parsed options, which may be useful in the future.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart 2019-03-23 06:05:46 +02:00
parent 3f906920e4
commit f8386836df
3 changed files with 24 additions and 22 deletions
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7
src/cam/main.cpp
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@ -67,9 +67,12 @@ static int parseOptions(int argc, char *argv[])
parser.addOption(OptList, OptionNone, "List all cameras", "list");
options = parser.parse(argc, argv);
if (!options.valid() || options.isSet(OptHelp)) {
if (!options.valid())
return -EINVAL;
if (options.empty() || options.isSet(OptHelp)) {
parser.usage();
return !options.valid() ? -EINVAL : -EINTR;
return options.empty() ? -EINVAL : -EINTR;
}
return 0;