/* strncmp function */
#include <string.h>

int (strncmp)(const char *s1, const char *s2, size_t n)
	{	/* compare unsigned char s1[max n], s2[max n] */
	for (; 0 < n; ++s1, ++s2, --n)
		if (*s1 != *s2)
			return ((*(unsigned char *)s1
				 *(unsigned char *)s2) ? -1 : +1);
		else if (*s1 == '\0')
			return (0);
	return (0);
	}

