What is the best alternative to strncpy()?

Question

The function strncpy() doesn\'t always null terminate so I want to know what is the best alternative that always null terminates? I want a function that if:

Answer 1

As an alternative to the answer that suggested snprintf(): (Note: trouble if n <= 0)

size_t sz = sizeof buf;
/*n is the number of characters to be copied from source*/
int n = (int) sz - 1;
snprintf(buf, sz, "%s", src);

code can use the following precision:

"... the maximum number of bytes to be written for s conversions. ..." C11 §7.21.6.1 4

sprintf(buf, "%.*s", n, src);

It has the subtle advantage in that src need not be a string, just an array of characters.

Another tool for strings.