> If your buffer isn't a NUL-terminated, then don't call a function that is only defined for NUL-terminated buffers.

It's not that people want to pass strncpy source buffers that lack NUL termination, it's that strncpy in certain situations will not NUL terminate its results.

https://begriffs.com/posts/2019-01-19-inside-c-standard-lib....

> some people claim strlcpy() is 'broken'

Speaking of strlcpy, it thankfully doesn't have the problem that strncpy does. However strlcpy is not in the C standard or in POSIX, so can't be used portably. In C99 snprintf is a better choice.