void block_or(void *src, size_t n, int pat);\r
void block_and(void *src, size_t n, int pat);\r
void block_andor(void *src, size_t n, int andpat, int orpat);\r
void block_or(void *src, size_t n, int pat);\r
void block_and(void *src, size_t n, int pat);\r
void block_andor(void *src, size_t n, int andpat, int orpat);\r