Function explain_filename

sql/sql_table.cc:185–344

*/

uint explain_filename(THD* thd,
		      const char *from,
                      char *to,
                      uint to_length,
                      enum_explain_filename_mode explain_mode)
{
  char *to_p= to;
  char *end_p= to_p + to_length;
  const char *db_name= NULL;
  int  db_name_len= 0;
  const char *table_name;
  int  table_name_len= 0;
  const char *part_name= NULL;
  int  part_name_len= 0;
  const char *subpart_name= NULL;
  int  subpart_name_len= 0;
  enum enum_part_name_type {NORMAL, TEMP, RENAMED} part_type= NORMAL;

  const char *tmp_p;
  DBUG_ENTER("explain_filename");
  DBUG_PRINT("enter", ("from '%s'", from));
  tmp_p= from;
  table_name= from;
  /*
    If '/' then take last directory part as database.
    '/' is the directory separator, not FN_LIB_CHAR
  */
  while ((tmp_p= strchr(tmp_p, '/')))
  {
    db_name= table_name;
    /* calculate the length */
    db_name_len= tmp_p - db_name;
    tmp_p++;
    table_name= tmp_p;
  }
  tmp_p= table_name;
  /* Look if there are partition tokens in the table name. */
  while ((tmp_p= strchr(tmp_p, '#')))
  {
    tmp_p++;
    switch (tmp_p[0]) {
    case 'P':
    case 'p':
      if (tmp_p[1] == '#')
      {
        part_name= tmp_p + 2;
        tmp_p+= 2;
      }
      break;
    case 'S':
    case 's':
      if ((tmp_p[1] == 'P' || tmp_p[1] == 'p') && tmp_p[2] == '#')
      {
        part_name_len= tmp_p - part_name - 1;
        subpart_name= tmp_p + 3;
        tmp_p+= 3;
      }
      break;