ref: ec4c79f3a6ed97ec0c407a870827382cbefb1166
dir: /src/libc/string/strncmp.c/
#include <string.h>
#undef strncmp
int
strncmp(const char *s1, const char *s2, size_t n)
{
	for ( ; n > 0 && *s1 == *s2; --n)
		++s1, ++s2;
	if (n == 0)
		return 0;
	return *(unsigned char *) s1 - *(unsigned char *) s2;
}