How can I prevent strncpy_s from padding destination buffer in debug build?

Question

I maintain a fairly large piece of legacy code that still uses strncpy a lot. I have now started the process of replacing the usage of strncpy with

Answer 1

strcpy_s() will fill in the buffer with 'FE' in debug mode only.

You can turn this off explicitly by calling _CrtSetDebugFillThreshold(0)