/**
 * The  strcmp()  function  compares  the two strings s1 and s2.  The locale is not taken into account
 * (for a locale-aware comparison, see strcoll(3)).  The comparison is done using unsigned characters.
 */
int strncmp(const char *s1, const char *s2, unsigned long n);

/**
 * The  memcmp() function compares the first n bytes (each interpreted as unsigned char) of the memory
 * areas s1 and s2.
 */
int memcmp(const void *s1, const void *s2, unsigned long n);