mango/libc/string/strcmp.c

int strcmp(const char *s1, const char *s2)
{
	int i;
	for (i = 0; s1[i] == s2[i]; i++)
		if (s1[i] == '\0')
			return 0;

	return s1[i] - s2[i];
}

int strncmp(const char *s1, const char *s2, unsigned long n)
{
	for (; n > 0; s1++, s2++, --n)
		if (*s1 != *s2)
			return ((*(unsigned char *)s1 < *(unsigned char *)s2)
			                ? -1
			                : 1);
		else if (*s1 == '\0')
			return 0;
	return 0;
}