Function cli_read_rows

sql-common/client.c:1506–1600

/* Read all rows (fields or data) from server */

MYSQL_DATA *cli_read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
			  unsigned int fields)
{
  uint	field;
  ulong pkt_len;
  ulong len;
  uchar *cp;
  char	*to, *end_to;
  MYSQL_DATA *result;
  MYSQL_ROWS **prev_ptr,*cur;
  NET *net = &mysql->net;
  DBUG_ENTER("cli_read_rows");

  if ((pkt_len= cli_safe_read(mysql)) == packet_error)
    DBUG_RETURN(0);
  if (!(result=(MYSQL_DATA*) my_malloc(sizeof(MYSQL_DATA),
				       MYF(MY_WME | MY_ZEROFILL))))
  {
    set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }
  init_alloc_root(&result->alloc,8192,0);	/* Assume rowlength < 8192 */
  result->alloc.min_malloc=sizeof(MYSQL_ROWS);
  prev_ptr= &result->data;
  result->rows=0;
  result->fields=fields;

  /*
    The last EOF packet is either a single 254 character or (in MySQL 4.1)
    254 followed by 1-7 status bytes.

    This doesn't conflict with normal usage of 254 which stands for a
    string where the length of the string is 8 bytes. (see net_field_length())
  */

  while (*(cp=net->read_pos) != 254 || pkt_len >= 8)
  {
    result->rows++;
    if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
					sizeof(MYSQL_ROWS))) ||
	!(cur->data= ((MYSQL_ROW)
		      alloc_root(&result->alloc,
				 (fields+1)*sizeof(char *)+pkt_len))))
    {
      free_rows(result);
      set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
      DBUG_RETURN(0);
    }
    *prev_ptr=cur;
    prev_ptr= &cur->next;
    to= (char*) (cur->data+fields+1);
    end_to=to+pkt_len-1;
    for (field=0 ; field < fields ; field++)
    {
      if ((len=(ulong) net_field_length(&cp)) == NULL_LENGTH)
      {						/* null field */
	cur->data[field] = 0;
      }