ustrncpy - Man Page
Copies a string into another one, specifying size. Allegro game programming library.
char *ustrncpy(char *dest, const char *src, int n);
This function is like ustrcpy() except that no more than `n' characters from `src' are copied into `dest'. If `src' is shorter than `n' characters, null characters are appended to `dest' as padding until `n' characters have been written.
Note that if `src' is longer than `n' characters, `dest' will not be null-terminated.
The return value is the value of `dest'.
uconvert(3), ustrcpy(3), ustrzncpy(3)
ustrcpy(3), ustrtok(3), ustrzncpy(3).
version 4.4.3 Allegro manual