maria-developers team mailing list archive

[Lixun Peng <penglixun@xxxxxxxxx>]

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