Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.

#ifndef UTILS_H
#define UTILS_H

void *domalloc(size_t);
char *dostrdup(const char *);

#endif /* UTILS_H */