Why should you use strncpy instead of strcpy?

Question

Edit: I\'ve added the source for the example.

I came across this example:

char source[MAX] = \"123456789\";
char source1[MAX] = \"12         


        

Answer 1

strncpy fills the destination up with '\0' for the size of source, eventhough the size of the destination is smaller....

manpage:

If the length of src is less than n, strncpy() pads the remainder of dest with null bytes.

and not only the remainder...also after this until n characters is reached. And thus you get an overflow... (see the man page implementation)