ref: 07c3fc899a4788187f52b99961c7ae1777201d5b
dir: /lib/c/string/strncmp.c/
#include <string.h>
#undef strncmp
int
strncmp(const char *s1, const char *s2, size_t n)
{
int c;
for ( ; n > 0 && (c = *s1) && c == *s2; --n)
++s1, ++s2;
if (n == 0)
return 0;
return *(unsigned char *) s1 - *(unsigned char *) s2;
}