s2                 18 string.c         const uchar *s1, *s2;
s2                 21 string.c         s2 = v2;
s2                 23 string.c           if(*s1 != *s2)
s2                 24 string.c             return *s1 - *s2;
s2                 25 string.c           s1++, s2++;