This inverts the truthiness of the return value. Previously, 0 meant
`true` and -1 meant `false`. Now, `true` (1) means `true` and `false` (0)
means `false`.
This forces all the loop bodies to be executed at least once, which is
harmless since it just means one more tox event loop iteration. This
reduces the jitter we see in coverage measurements, which is partially
caused by loops sometimes being entered and sometimes not (because their
condition happens to randomly already be true).
* specify correct source files
* add save_compatibility_test (commented out for now)
* reformat TESTS to one line per test, and set check_PROGRAMS := TESTS
* add run_auto_test.h to EXTRA_DIST
* Fix `AUTO_TEST_CFLAGS` -> `AUTOTEST_CFLAGS`.
It is invalid to compile an XPG3, XPG4, XPG4v2, or XPG5 application
using c99. The same is true for POSIX.1-1990, POSIX.2-1992, POSIX.1b,
and POSIX.1c applications. Likewise, it is invalid to compile an XPG6
or a POSIX.1-2001 application with anything other than a c99 or later
compiler. Therefore, Solaris libc forces an error in both cases.
Reduced by, e.g.:
* `file_transfer_test`: 33% of the `clock_gettime` calls.
* `tox_many_test`: 53% of the `clock_gettime` calls.
Other tests will see similar improvements. Real world applications will
be closer to 40-50% improvement, since tox_many_test has 100 nodes, while
file_transfer_test has 2 nodes.
* Use Camel_Snake_Case for type names.
* Use at least 4 characters for constant names. I.e. `END` is a type
name, but `RETURN` is a constant name. This is because `DHT` is a type
name (yay consistency).
* Using `min_*` functions instead of MIN, we can avoid a cast.
* Use `for`-loops for for-each-frame semantics instead of `while`.
* Don't use assignments as expressions.
* `++i` instead of `i++`.
* Function pointers are dereferenced automatically, so no need to
manually do so.
* Avoid void pointers that lie about not being spaghetti code. Toxcore
and toxav are both spaghetti and shouldn't pretend anything else.
* Don't use empty statements (e.g. no `;;` anywhere in the code).
Instead of importing a well-known file. This gives toktok-stack more
freedom in where and how it wants to define its interface, as long as it
provides the configurations requested ("linux" and "clang").
* Fix `toxav_get_tox` to return tox, not messenger.
* Fix the casts from Tox* to Messenger* in toxav_old.c.
* Pass Tox instead of Messenger to public group AV callbacks.
Somehow it still works because the lower levels can deal with
inconsistent/broken state, but this lets us avoid that broken state in
the first place. If a friend connection doesn't exist, we don't add it to
our group.
