ref: 2c40b548c9cbc85e2005eb343ae96d94334fbebf
dir: /lib/c/src/strncmp.c/
#include <string.h>
#undef strncmp
int
strncmp(const char *s1, const char *s2, size_t n)
{
for (; n && *s1 && *s2 && *s1 == *s2; --n, ++s1, ++s2);
/* nothing */;
return n ? (*(unsigned char *)s1 - *(unsigned char *)s2) : 0;
}