strcmp函数实现源码

int strcmp(const char *str1, const char *str2)
{
	const unsigned char *s1 = (const unsigned char *)str1;
	const unsigned char *s2 = (const unsigned char *)str2;
	int delta = 0;

	while (*s1 || *s2) {
		delta = *s2 - *s1;
		if (delta)
			return delta;
		s1++;
		s2++;
	}
	return 0;
}