Comment by Joker_vD

> It can read past the end of the src-buffer, when sizeof src < sizeof dest and src is not nul-terminated.

So basically, don't invoke a function "strscpy — Copy a C-string into a sized buffer" on something that is not a C-string. Its description specifically states that it copies a string into a buffer. Compare with the wordings in standard of strcpy ("The strcpy function copies the string pointed to by s2 (including the terminating null character) into the array pointed to by s1") and strncpy ("The strncpy function copies not more than n characters (characters that follow a null character are not copied) from the array pointed to by s2 to the array pointed to by s1... If the array pointed to by s2 is a string that is shorter than n characters...").

It's not a function to copy an array into an array (there is memcpy/memmov for that); it's a function to copy a string into an array which, after the function is finished, will certainly be a string (unless it's zero-sized, sigh).