Hi Guys, I want to copy the contents of the IO_CACHE into a string. But I'm not found a function can do it, but I found "my_b_copy_to_file" can do the similar thing, so I implement a function "my_b_copy_to_string" by imitating "my_b_copy_to_file", to do this thing. Could you please review my code? char *my_b_copy_to_string(IO_CACHE *cache, size_t *bytes_in_cache) { char *buff; char *tmp_buff; size_t now_size; size_t inc_size; /* Reinit the cache to read from the beginning of the cache */ if (reinit_io_cache(cache, READ_CACHE, 0L, FALSE, FALSE)) return NULL; now_size= my_b_bytes_in_cache(cache); inc_size= 0; buff= (char *) my_malloc(now_size + 1, MYF(0)); tmp_buff= buff; do { now_size+= inc_size; if(inc_size > 0) { buff= (char *) my_realloc(buff, now_size + 1, MYF(0)); tmp_buff= buff + (now_size - inc_size); memcpy(tmp_buff, cache->read_pos, inc_size); } else { memcpy(tmp_buff, cache->read_pos, now_size); } cache->read_pos= cache->read_end; } while ((inc_size= my_b_fill(cache))); buff[now_size]= '\0'; reinit_io_cache(cache, WRITE_CACHE, 0, FALSE, TRUE); *bytes_in_cache= now_size; return buff; } Thanks, Lixun -- Senior MySQL Developer @ Taobao.com Mobile Phone: +86 18658156856 (Hangzhou) Gtalk: penglixun(at)gmail.com Twitter: http://www.twitter.com/plinux Blog: http://www.penglixun.com