1#include <string.h> 2 3int strncmp(const char *_l, const char *_r, size_t n) 4{ 5 const unsigned char *l=(void *)_l, *r=(void *)_r; 6 if (!n--) return 0; 7 for (; *l && *r && n && *l == *r ; l++, r++, n--); 8 return *l - *r; 9} 10