This component defines a U_ASSERT() macro (in u_assert.h) which is called throughout ubxlib where the C-library assert() function might normally be called.
If the condition passed to U_ASSERT() evaluates to false then uAssertFailed() is called with the file name and line number of U_ASSERT(); uAssertFailed() simply prints out this file and line number information and then enters an infinite loop.
uAssertFailed() is defined to have weak linkage, so you can override it by defining your own implementation of the uAssertFailed() function. Alternatively you may call uAssertHookSet() to register an assert failure function which will override the default behaviour of uAssertFailed(). In both cases it is up to your function to take appropriate action and not return; should your function return then code execution will just continue from after the failed U_ASSERT() macro.
If the conditional compilation flag U_CFG_DISABLE_ASSERT is defined then no U_ASSERT() macros will have any effect. This is quite a dangerous thing to do; the U_ASSERT() function is called when an unrecoverable programming error has been detected, removing such checks leaves the code unprotected.