mariadb/sql/parse_file.cc

/* Copyright (C) 2004 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

// Text .frm files management routines

#include "mysql_priv.h"
#include <errno.h>
#include <m_ctype.h>
#include <my_sys.h>
#include <my_dir.h>

/* from sql_db.cc */
extern long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);


/*
  write string with escaping

  SYNOPSIS
    write_escaped_string()
    file	- IO_CACHE for record
    val_s	- string for writing

  RETURN
    FALSE - OK
    TRUE  - error
*/

static my_bool
write_escaped_string(IO_CACHE *file, LEX_STRING *val_s)
{
  char *eos= val_s->str + val_s->length;
  char *ptr= val_s->str;

  for (; ptr < eos; ptr++)
  {
    /*
      Should be in sync with read_escaped_string() and
      parse_quoted_escaped_string()
    */
    switch(*ptr) {
    case '\\': // escape character
      if (my_b_append(file, (const byte *)STRING_WITH_LEN("\\\\")))
	return TRUE;
      break;
    case '\n': // parameter value delimiter
      if (my_b_append(file, (const byte *)STRING_WITH_LEN("\\n")))
	return TRUE;
      break;
    case '\0': // problem for some string processing utilities
      if (my_b_append(file, (const byte *)STRING_WITH_LEN("\\0")))
	return TRUE;
      break;
    case 26: // problem for windows utilities (Ctrl-Z)
      if (my_b_append(file, (const byte *)STRING_WITH_LEN("\\z")))
	return TRUE;
      break;
    case '\'': // list of string delimiter
      if (my_b_append(file, (const byte *)STRING_WITH_LEN("\\\'")))
	return TRUE;
      break;
    default:
      if (my_b_append(file, (const byte *)ptr, 1))
	return TRUE;
    }
  }
  return FALSE;
}


/*
  write parameter value to IO_CACHE

  SYNOPSIS
    write_parameter()
    file	pointer to IO_CACHE structure for writing
    base	pointer to data structure
    parameter	pointer to parameter descriptor

  RETURN
    FALSE - OK
    TRUE  - error
*/

static my_bool
write_parameter(IO_CACHE *file, gptr base, File_option *parameter)
{
  char num_buf[20];			// buffer for numeric operations
  // string for numeric operations
  String num(num_buf, sizeof(num_buf), &my_charset_bin);
  DBUG_ENTER("write_parameter");

  switch (parameter->type) {
  case FILE_OPTIONS_STRING:
  {
    LEX_STRING *val_s= (LEX_STRING *)(base + parameter->offset);
    if (my_b_append(file, (const byte *)val_s->str, val_s->length))
      DBUG_RETURN(TRUE);
    break;
  }
  case FILE_OPTIONS_ESTRING:
  {
    if (write_escaped_string(file, (LEX_STRING *)(base + parameter->offset)))
      DBUG_RETURN(TRUE);
    break;
  }
  case FILE_OPTIONS_ULONGLONG:
  {
    num.set(*((ulonglong *)(base + parameter->offset)), &my_charset_bin);
    if (my_b_append(file, (const byte *)num.ptr(), num.length()))
      DBUG_RETURN(TRUE);
    break;
  }
  case FILE_OPTIONS_TIMESTAMP:
  {
    /* string have to be allocated already */
    LEX_STRING *val_s= (LEX_STRING *)(base + parameter->offset);
    time_t tm= time(NULL);

    get_date(val_s->str, GETDATE_DATE_TIME|GETDATE_GMT|GETDATE_FIXEDLENGTH,
	     tm);
    val_s->length= PARSE_FILE_TIMESTAMPLENGTH;
    if (my_b_append(file, (const byte *)val_s->str,
                    PARSE_FILE_TIMESTAMPLENGTH))
      DBUG_RETURN(TRUE);
    break;
  }
  case FILE_OPTIONS_STRLIST:
  {
    List_iterator_fast<LEX_STRING> it(*((List<LEX_STRING>*)
					(base + parameter->offset)));
    bool first= 1;
    LEX_STRING *str;
    while ((str= it++))
    {
      // We need ' ' after string to detect list continuation
      if ((!first && my_b_append(file, (const byte *)STRING_WITH_LEN(" "))) ||
	  my_b_append(file, (const byte *)STRING_WITH_LEN("\'")) ||
          write_escaped_string(file, str) ||
	  my_b_append(file, (const byte *)STRING_WITH_LEN("\'")))
      {
	DBUG_RETURN(TRUE);
      }
      first= 0;
    }
    break;
  }
  case FILE_OPTIONS_ULLLIST:
  {
    List_iterator_fast<ulonglong> it(*((List<ulonglong>*)
                                       (base + parameter->offset)));
    bool first= 1;
    ulonglong *val;
    while ((val= it++))
    {
      num.set(*val, &my_charset_bin);
      // We need ' ' after string to detect list continuation
      if ((!first && my_b_append(file, (const byte *)STRING_WITH_LEN(" "))) ||
          my_b_append(file, (const byte *)num.ptr(), num.length()))
      {
        DBUG_RETURN(TRUE);
      }
      first= 0;
    }
    break;
  }
  default:
    DBUG_ASSERT(0); // never should happened
  }
  DBUG_RETURN(FALSE);
}


/*
  write new .frm

  SYNOPSIS
    sql_create_definition_file()
    dir			directory where put .frm
    file		.frm file name
    type		.frm type string (VIEW, TABLE)
    base		base address for parameter reading (structure like
			TABLE)
    parameters		parameters description

  RETURN
    FALSE - OK
    TRUE - error
*/

my_bool
sql_create_definition_file(const LEX_STRING *dir, const LEX_STRING *file_name,
			   const LEX_STRING *type,
			   gptr base, File_option *parameters)
{
  File handler;
  IO_CACHE file;
  char path[FN_REFLEN+1];	// +1 to put temporary file name for sure
  int path_end;
  File_option *param;
  DBUG_ENTER("sql_create_definition_file");
  DBUG_PRINT("enter", ("Dir: %s, file: %s, base 0x%lx",
		       dir->str, file_name->str, (ulong) base));

  fn_format(path, file_name->str, dir->str, 0, MY_UNPACK_FILENAME);
  path_end= strlen(path);

  // temporary file name
  path[path_end]='~';
  path[path_end+1]= '\0';
  if ((handler= my_create(path, CREATE_MODE, O_RDWR | O_TRUNC,
			  MYF(MY_WME))) <= 0)
  {
    DBUG_RETURN(TRUE);
  }

  if (init_io_cache(&file, handler, 0, SEQ_READ_APPEND, 0L, 0, MYF(MY_WME)))
    goto err_w_file;

  // write header (file signature)
  if (my_b_append(&file, (const byte *)STRING_WITH_LEN("TYPE=")) ||
      my_b_append(&file, (const byte *)type->str, type->length) ||
      my_b_append(&file, (const byte *)STRING_WITH_LEN("\n")))
    goto err_w_file;

  // write parameters to temporary file
  for (param= parameters; param->name.str; param++)
  {
    if (my_b_append(&file, (const byte *)param->name.str,
                    param->name.length) ||
	my_b_append(&file, (const byte *)STRING_WITH_LEN("=")) ||
	write_parameter(&file, base, param) ||
	my_b_append(&file, (const byte *)STRING_WITH_LEN("\n")))
      goto err_w_cache;
  }

  if (end_io_cache(&file))
    goto err_w_file;

  if (my_close(handler, MYF(MY_WME)))
  {
    DBUG_RETURN(TRUE);
  }

  path[path_end]='\0';

  {
    // rename temporary file
    char path_to[FN_REFLEN];
    memcpy(path_to, path, path_end+1);
    path[path_end]='~';
    if (my_rename(path, path_to, MYF(MY_WME)))
    {
      DBUG_RETURN(TRUE);
    }
  }
  DBUG_RETURN(FALSE);
err_w_cache:
  end_io_cache(&file);
err_w_file:
  my_close(handler, MYF(MY_WME));
  DBUG_RETURN(TRUE);
}

/*
  Renames a frm file (including backups) in same schema

  SYNOPSIS
    rename_in_schema_file
    thd               thread handler
    schema            name of given schema           
    old_name          original file name
    new_name          new file name

  RETURN
    0 - OK 
    1 - Error (only if renaming of frm failed)

*/
my_bool rename_in_schema_file(THD *thd,
                              const char *schema, const char *old_name, 
                              const char *new_name)
{
  char old_path[FN_REFLEN], new_path[FN_REFLEN], arc_path[FN_REFLEN];

  strxnmov(old_path, FN_REFLEN, mysql_data_home, "/", schema, "/",
           old_name, reg_ext, NullS);
  (void) unpack_filename(old_path, old_path);

  strxnmov(new_path, FN_REFLEN, mysql_data_home, "/", schema, "/",
           new_name, reg_ext, NullS);
  (void) unpack_filename(new_path, new_path);

  if (my_rename(old_path, new_path, MYF(MY_WME)))
    return 1;

  /* check if arc_dir exists: disabled unused feature (see bug #17823). */
  strxnmov(arc_path, FN_REFLEN, mysql_data_home, "/", schema, "/arc", NullS);
  (void) unpack_filename(arc_path, arc_path);
  
  { // remove obsolete 'arc' directory and files if any
    MY_DIR *new_dirp;
    if ((new_dirp = my_dir(arc_path, MYF(MY_DONT_SORT))))
    {
      DBUG_PRINT("my",("Archive subdir found: %s", arc_path));
      (void) mysql_rm_arc_files(thd, new_dirp, arc_path);
    }
  }
  return 0;
}

/*
  Prepare frm to parse (read to memory)

  SYNOPSIS
    sql_parse_prepare()
    file_name		- path & filename to .frm file
    mem_root		- MEM_ROOT for buffer allocation
    bad_format_errors	- send errors on bad content

  RETURN
    0 - error
    parser object

  NOTE
    returned pointer + 1 will be type of .frm
*/

File_parser * 
sql_parse_prepare(const LEX_STRING *file_name, MEM_ROOT *mem_root,
		  bool bad_format_errors)
{
  MY_STAT stat_info;
  uint len;
  char *end, *sign;
  File_parser *parser;
  File file;
  DBUG_ENTER("sql__parse_prepare");

  if (!my_stat(file_name->str, &stat_info, MYF(MY_WME)))
  {
    DBUG_RETURN(0);
  }

  if (stat_info.st_size > INT_MAX-1)
  {
    my_error(ER_FPARSER_TOO_BIG_FILE, MYF(0), file_name->str);
    DBUG_RETURN(0);
  }

  if (!(parser= new(mem_root) File_parser))
  {
    DBUG_RETURN(0);
  }

  if (!(parser->buff= alloc_root(mem_root, stat_info.st_size+1)))
  {
    DBUG_RETURN(0);
  }

  if ((file= my_open(file_name->str, O_RDONLY | O_SHARE, MYF(MY_WME))) < 0)
  {
    DBUG_RETURN(0);
  }
  
  if ((len= my_read(file, (byte *)parser->buff,
                    stat_info.st_size, MYF(MY_WME))) ==
      MY_FILE_ERROR)
  {
    my_close(file, MYF(MY_WME));
    DBUG_RETURN(0);
  }

  if (my_close(file, MYF(MY_WME)))
  {
    DBUG_RETURN(0);
  }

  end= parser->end= parser->buff + len;
  *end= '\0'; // barrier for more simple parsing

  // 7 = 5 (TYPE=) + 1 (letter at least of type name) + 1 ('\n')
  if (len < 7 ||
      parser->buff[0] != 'T' ||
      parser->buff[1] != 'Y' ||
      parser->buff[2] != 'P' ||
      parser->buff[3] != 'E' ||
      parser->buff[4] != '=')
    goto frm_error;

  // skip signature;
  parser->file_type.str= sign= parser->buff + 5;
  while (*sign >= 'A' && *sign <= 'Z' && sign < end)
    sign++;
  if (*sign != '\n')
    goto frm_error;
  parser->file_type.length= sign - parser->file_type.str;
  // EOS for file signature just for safety
  *sign= '\0';

  parser->start= sign + 1;
  parser->content_ok= 1;

  DBUG_RETURN(parser);

frm_error:
  if (bad_format_errors)
  {
    my_error(ER_FPARSER_BAD_HEADER, MYF(0), file_name->str);
    DBUG_RETURN(0);
  }
  else
    DBUG_RETURN(parser); // upper level have to check parser->ok()
}


/*
  parse LEX_STRING

  SYNOPSIS
    parse_string()
    ptr		- pointer on string beginning
    end		- pointer on symbol after parsed string end (still owned
		  by buffer and can be accessed
    mem_root	- MEM_ROOT for parameter allocation
    str		- pointer on string, where results should be stored

  RETURN
    0	- error
    #	- pointer on symbol after string
*/

static char *
parse_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
{
  // get string length
  char *eol= strchr(ptr, '\n');

  if (eol >= end)
    return 0;

  str->length= eol - ptr;

  if (!(str->str= alloc_root(mem_root, str->length+1)))
    return 0;

  memcpy(str->str, ptr, str->length);
  str->str[str->length]= '\0'; // just for safety
  return eol+1;
}


/*
  read escaped string from ptr to eol in already allocated str

  SYNOPSIS
    read_escaped_string()
    ptr		- pointer on string beginning
    eol		- pointer on character after end of string
    str		- target string

  RETURN
    FALSE - OK
    TRUE  - error
*/

my_bool
read_escaped_string(char *ptr, char *eol, LEX_STRING *str)
{
  char *write_pos= str->str;

  for (; ptr < eol; ptr++, write_pos++)
  {
    char c= *ptr;
    if (c == '\\')
    {
      ptr++;
      if (ptr >= eol)
	return TRUE;
      /*
	Should be in sync with write_escaped_string() and
	parse_quoted_escaped_string()
      */
      switch(*ptr) {
      case '\\':
	*write_pos= '\\';
	break;
      case 'n':
	*write_pos= '\n';
	break;
      case '0':
	*write_pos= '\0';
	break;
      case 'z':
	*write_pos= 26;
	break;
      case '\'':
	*write_pos= '\'';
        break;
      default:
	return TRUE;
      }
    }
    else
      *write_pos= c;
  }
  str->str[str->length= write_pos-str->str]= '\0'; // just for safety
  return FALSE;
}


/*
  parse \n delimited escaped string

  SYNOPSIS
    parse_escaped_string()
    ptr		- pointer on string beginning
    end		- pointer on symbol after parsed string end (still owned
		  by buffer and can be accessed
    mem_root	- MEM_ROOT for parameter allocation
    str		- pointer on string, where results should be stored

  RETURN
    0	- error
    #	- pointer on symbol after string
*/

char *
parse_escaped_string(char *ptr, char *end, MEM_ROOT *mem_root, LEX_STRING *str)
{
  char *eol= strchr(ptr, '\n');

  if (eol == 0 || eol >= end ||
      !(str->str= alloc_root(mem_root, (eol - ptr) + 1)) ||
      read_escaped_string(ptr, eol, str))
    return 0;
    
  return eol+1;
}


/*
  parse '' delimited escaped string

  SYNOPSIS
    parse_quoted_escaped_string()
    ptr		- pointer on string beginning
    end		- pointer on symbol after parsed string end (still owned
		  by buffer and can be accessed
    mem_root	- MEM_ROOT for parameter allocation
    str		- pointer on string, where results should be stored

  RETURN
    0	- error
    #	- pointer on symbol after string
*/

static char *
parse_quoted_escaped_string(char *ptr, char *end,
			    MEM_ROOT *mem_root, LEX_STRING *str)
{
  char *eol;
  uint result_len= 0;
  bool escaped= 0;

  // starting '
  if (*(ptr++) != '\'')
    return 0;

  // find ending '
  for (eol= ptr; (*eol != '\'' || escaped) && eol < end; eol++)
  {
    if (!(escaped= (*eol == '\\' && !escaped)))
      result_len++;
  }

  // process string
  if (eol >= end ||
      !(str->str= alloc_root(mem_root, result_len + 1)) ||
      read_escaped_string(ptr, eol, str))
    return 0;

  return eol+1;
}


/*
  Parser for FILE_OPTIONS_ULLLIST type value.

  SYNOPSIS
    get_file_options_ulllist()
    ptr                  [in/out] pointer to parameter
    end                  [in] end of the configuration
    line                 [in] pointer to the line begining
    base                 [in] base address for parameter writing (structure
                              like TABLE)
    parameter            [in] description
    mem_root             [in] MEM_ROOT for parameters allocation
*/

bool get_file_options_ulllist(char *&ptr, char *end, char *line,
                              gptr base, File_option *parameter,
                              MEM_ROOT *mem_root)
{
  List<ulonglong> *nlist= (List<ulonglong>*)(base + parameter->offset);
  ulonglong *num;
  nlist->empty();
  // list parsing
  while (ptr < end)
  {
    int not_used;
    char *num_end= end;
    if (!(num= (ulonglong*)alloc_root(mem_root, sizeof(ulonglong))) ||
        nlist->push_back(num, mem_root))
      goto nlist_err;
    *num= my_strtoll10(ptr, &num_end, &not_used);
    ptr= num_end;
    switch (*ptr) {
    case '\n':
      goto end_of_nlist;
    case ' ':
      // we cant go over buffer bounds, because we have \0 at the end
      ptr++;
      break;
    default:
      goto nlist_err_w_message;
    }
  }

end_of_nlist:
  if (*(ptr++) != '\n')
    goto nlist_err;
  return FALSE;

nlist_err_w_message:
  my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0), parameter->name.str, line);
nlist_err:
  return TRUE;
}


/*
  parse parameters

  SYNOPSIS
    File_parser::parse()
    base                base address for parameter writing (structure like
                        TABLE)
    mem_root            MEM_ROOT for parameters allocation
    parameters          parameters description
    required            number of parameters in the above list. If the file
                        contains more parameters than "required", they will
                        be ignored. If the file contains less parameters
                        then "required", non-existing parameters will
                        remain their values.
    hook                hook called for unknown keys
    hook_data           some data specific for the hook

  RETURN
    FALSE - OK
    TRUE - error
*/

my_bool
File_parser::parse(gptr base, MEM_ROOT *mem_root,
                   struct File_option *parameters, uint required,
                   Unknown_key_hook *hook)
{
  uint first_param= 0, found= 0;
  char *ptr= start;
  char *eol;
  LEX_STRING *str;
  List<LEX_STRING> *list;
  DBUG_ENTER("File_parser::parse");

  while (ptr < end && found < required)
  {
    char *line= ptr;
    if (*ptr == '#')
    {
      // it is comment
      if (!(ptr= strchr(ptr, '\n')))
      {
	my_error(ER_FPARSER_EOF_IN_COMMENT, MYF(0), line);
	DBUG_RETURN(TRUE);
      }
      ptr++;
    }
    else
    {
      File_option *parameter= parameters+first_param,
	*parameters_end= parameters+required;
      int len= 0;
      for (; parameter < parameters_end; parameter++)
      {
	len= parameter->name.length;
	// check length
	if (len < (end-ptr) && ptr[len] != '=')
	  continue;
	// check keyword
	if (memcmp(parameter->name.str, ptr, len) == 0)
	  break;
      }

      if (parameter < parameters_end)
      {
	found++;
	/*
	  if we found first parameter, start search from next parameter
	  next time.
	  (this small optimisation should work, because they should be
	  written in same order)
	*/
	if (parameter == parameters+first_param)
	  first_param++;

	// get value
	ptr+= (len+1);
	switch (parameter->type) {
	case FILE_OPTIONS_STRING:
	{
	  if (!(ptr= parse_string(ptr, end, mem_root,
				  (LEX_STRING *)(base +
						 parameter->offset))))
	  {
	    my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
                     parameter->name.str, line);
	    DBUG_RETURN(TRUE);
	  }
	  break;
	}
	case FILE_OPTIONS_ESTRING:
	{
	  if (!(ptr= parse_escaped_string(ptr, end, mem_root,
					  (LEX_STRING *)
					  (base + parameter->offset))))
	  {
	    my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
                     parameter->name.str, line);
	    DBUG_RETURN(TRUE);
	  }
	  break;
	}
	case FILE_OPTIONS_ULONGLONG:
	  if (!(eol= strchr(ptr, '\n')))
	  {
	    my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
                     parameter->name.str, line);
	    DBUG_RETURN(TRUE);
	  }
          {
            int not_used;
	    *((ulonglong*)(base + parameter->offset))=
              my_strtoll10(ptr, 0, &not_used);
          }
	  ptr= eol+1;
	  break;
	case FILE_OPTIONS_TIMESTAMP:
	{
	  /* string have to be allocated already */
	  LEX_STRING *val= (LEX_STRING *)(base + parameter->offset);
	  /* yyyy-mm-dd HH:MM:SS = 19(PARSE_FILE_TIMESTAMPLENGTH) characters */
	  if (ptr[PARSE_FILE_TIMESTAMPLENGTH] != '\n')
	  {
	    my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
                     parameter->name.str, line);
	    DBUG_RETURN(TRUE);
	  }
	  memcpy(val->str, ptr, PARSE_FILE_TIMESTAMPLENGTH);
	  val->str[val->length= PARSE_FILE_TIMESTAMPLENGTH]= '\0';
	  ptr+= (PARSE_FILE_TIMESTAMPLENGTH+1);
	  break;
	}
	case FILE_OPTIONS_STRLIST:
	{
          list= (List<LEX_STRING>*)(base + parameter->offset);

	  list->empty();
	  // list parsing
	  while (ptr < end)
	  {
	    if (!(str= (LEX_STRING*)alloc_root(mem_root,
					       sizeof(LEX_STRING))) ||
		list->push_back(str, mem_root))
	      goto list_err;
	    if (!(ptr= parse_quoted_escaped_string(ptr, end, mem_root, str)))
	      goto list_err_w_message;
	    switch (*ptr) {
	    case '\n':
	      goto end_of_list;
	    case ' ':
	      // we cant go over buffer bounds, because we have \0 at the end
	      ptr++;
	      break;
	    default:
	      goto list_err_w_message;
	    }
	  }

end_of_list:
	  if (*(ptr++) != '\n')
	    goto list_err;
	  break;

list_err_w_message:
	  my_error(ER_FPARSER_ERROR_IN_PARAMETER, MYF(0),
                   parameter->name.str, line);
list_err:
	  DBUG_RETURN(TRUE);
	}
        case FILE_OPTIONS_ULLLIST:
          if (get_file_options_ulllist(ptr, end, line, base,
                                       parameter, mem_root))
            DBUG_RETURN(TRUE);
          break;
	default:
	  DBUG_ASSERT(0); // never should happened
	}
      }
      else
      {
        ptr= line;
        if (hook->process_unknown_string(ptr, base, mem_root, end))
        {
          DBUG_RETURN(TRUE);
        }
        // skip unknown parameter
        if (!(ptr= strchr(ptr, '\n')))
        {
          my_error(ER_FPARSER_EOF_IN_UNKNOWN_PARAMETER, MYF(0), line);
          DBUG_RETURN(TRUE);
        }
        ptr++;
      }
    }
  }

  /*
    NOTE: if we read less than "required" parameters, it is still Ok.
    Probably, we've just read the file of the previous version, which
    contains less parameters.
  */

  DBUG_RETURN(FALSE);
}


/*
  Dummy unknown key hook

  SYNOPSIS
    File_parser_dummy_hook::process_unknown_string()
    unknown_key          [in/out] reference on the line with unknown
                                  parameter and the parsing point
    base                 [in] base address for parameter writing (structure like
                              TABLE)
    mem_root             [in] MEM_ROOT for parameters allocation
    end                  [in] the end of the configuration

  NOTE
    This hook used to catch no longer supported keys and process them for
    backward compatibility, but it will not slow down processing of modern
    format files.
    This hook does nothing except debug output.

  RETURN
    FALSE OK
    TRUE  Error
*/

bool
File_parser_dummy_hook::process_unknown_string(char *&unknown_key,
                                               gptr base, MEM_ROOT *mem_root,
                                               char *end)
{
  DBUG_ENTER("file_parser_dummy_hook::process_unknown_string");
  DBUG_PRINT("info", ("Unknown key: '%60s'", unknown_key));
  DBUG_RETURN(FALSE);
}