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#include <stddef.h>

int memcmp(const void *s1, const void *s2, size_t n)
{
	const unsigned char *p1 = s1;
	const unsigned char *p2 = s2;
	while (n--) {
		if (*p1 != *p2)
			return *p1 - *p2;
		p1++;
		p2++;
	}
	return 0;
}