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mariadb/storage/heap/hp_clear.c
monty@mysql.com/narttu.mysql.fi 088e2395f1 WL#3817: Simplify string / memory area types and make things more consistent (first part) 
The following type conversions was done:

- Changed byte to uchar
- Changed gptr to uchar*
- Change my_string to char *
- Change my_size_t to size_t
- Change size_s to size_t

Removed declaration of byte, gptr, my_string, my_size_t and size_s. 

Following function parameter changes was done:
- All string functions in mysys/strings was changed to use size_t
  instead of uint for string lengths.
- All read()/write() functions changed to use size_t (including vio).
- All protocoll functions changed to use size_t instead of uint
- Functions that used a pointer to a string length was changed to use size_t*
- Changed malloc(), free() and related functions from using gptr to use void *
  as this requires fewer casts in the code and is more in line with how the
  standard functions work.
- Added extra length argument to dirname_part() to return the length of the
  created string.
- Changed (at least) following functions to take uchar* as argument:
  - db_dump()
  - my_net_write()
  - net_write_command()
  - net_store_data()
  - DBUG_DUMP()
  - decimal2bin() & bin2decimal()
- Changed my_compress() and my_uncompress() to use size_t. Changed one
  argument to my_uncompress() from a pointer to a value as we only return
  one value (makes function easier to use).
- Changed type of 'pack_data' argument to packfrm() to avoid casts.
- Changed in readfrm() and writefrom(), ha_discover and handler::discover()
  the type for argument 'frmdata' to uchar** to avoid casts.
- Changed most Field functions to use uchar* instead of char* (reduced a lot of
  casts).
- Changed field->val_xxx(xxx, new_ptr) to take const pointers.

Other changes:
- Removed a lot of not needed casts
- Added a few new cast required by other changes
- Added some cast to my_multi_malloc() arguments for safety (as string lengths
  needs to be uint, not size_t).
- Fixed all calls to hash-get-key functions to use size_t*. (Needed to be done
  explicitely as this conflict was often hided by casting the function to
  hash_get_key).
- Changed some buffers to memory regions to uchar* to avoid casts.
- Changed some string lengths from uint to size_t.
- Changed field->ptr to be uchar* instead of char*. This allowed us to
  get rid of a lot of casts.
- Some changes from true -> TRUE, false -> FALSE, unsigned char -> uchar
- Include zlib.h in some files as we needed declaration of crc32()
- Changed MY_FILE_ERROR to be (size_t) -1.
- Changed many variables to hold the result of my_read() / my_write() to be
  size_t. This was needed to properly detect errors (which are
  returned as (size_t) -1).
- Removed some very old VMS code
- Changed packfrm()/unpackfrm() to not be depending on uint size
  (portability fix)
- Removed windows specific code to restore cursor position as this
  causes slowdown on windows and we should not mix read() and pread()
  calls anyway as this is not thread safe. Updated function comment to
  reflect this. Changed function that depended on original behavior of
  my_pwrite() to itself restore the cursor position (one such case).
- Added some missing checking of return value of malloc().
- Changed definition of MOD_PAD_CHAR_TO_FULL_LENGTH to avoid 'long' overflow.
- Changed type of table_def::m_size from my_size_t to ulong to reflect that
  m_size is the number of elements in the array, not a string/memory
  length.
- Moved THD::max_row_length() to table.cc (as it's not depending on THD).
  Inlined max_row_length_blob() into this function.
- More function comments
- Fixed some compiler warnings when compiled without partitions.
- Removed setting of LEX_STRING() arguments in declaration (portability fix).
- Some trivial indentation/variable name changes.
- Some trivial code simplifications:
  - Replaced some calls to alloc_root + memcpy to use
    strmake_root()/strdup_root().
  - Changed some calls from memdup() to strmake() (Safety fix)
  - Simpler loops in client-simple.c
2007-05-10 12:59:39 +03:00

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/* Copyright (C) 2000-2002, 2004, 2006 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 */
/*
remove all records from database
Identical as hp_create() and hp_open() but used HP_SHARE* instead of name and
database remains open.
*/
#include "heapdef.h"
void heap_clear(HP_INFO *info)
{
hp_clear(info->s);
}
void hp_clear(HP_SHARE *info)
{
DBUG_ENTER("hp_clear");
if (info->block.levels)
VOID(hp_free_level(&info->block,info->block.levels,info->block.root,
(uchar*) 0));
info->block.levels=0;
hp_clear_keys(info);
info->records= info->deleted= 0;
info->data_length= 0;
info->blength=1;
info->changed=0;
info->del_link=0;
DBUG_VOID_RETURN;
}
/*
Clear all keys.
SYNOPSIS
heap_clear_keys()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Delete all trees of all indexes and leave them empty.
RETURN
void
*/
void heap_clear_keys(HP_INFO *info)
{
hp_clear(info->s);
}
/*
Clear all keys.
SYNOPSIS
hp_clear_keys()
info A pointer to the heap storage engine HP_SHARE struct.
DESCRIPTION
Delete all trees of all indexes and leave them empty.
RETURN
void
*/
void hp_clear_keys(HP_SHARE *info)
{
uint key;
DBUG_ENTER("hp_clear_keys");
for (key=0 ; key < info->keys ; key++)
{
HP_KEYDEF *keyinfo = info->keydef + key;
if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
{
delete_tree(&keyinfo->rb_tree);
}
else
{
HP_BLOCK *block= &keyinfo->block;
if (block->levels)
VOID(hp_free_level(block,block->levels,block->root,(uchar*) 0));
block->levels=0;
block->last_allocated=0;
keyinfo->hash_buckets= 0;
}
}
info->index_length=0;
DBUG_VOID_RETURN;
}
/*
Disable all indexes.
SYNOPSIS
heap_disable_indexes()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Disable and clear (remove contents of) all indexes.
RETURN
0 ok
*/
int heap_disable_indexes(HP_INFO *info)
{
HP_SHARE *share= info->s;
if (share->keys)
{
hp_clear_keys(share);
share->currently_disabled_keys= share->keys;
share->keys= 0;
}
return 0;
}
/*
Enable all indexes
SYNOPSIS
heap_enable_indexes()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Enable all indexes. The indexes might have been disabled
by heap_disable_index() before.
The function works only if both data and indexes are empty,
since the heap storage engine cannot repair the indexes.
To be sure, call handler::delete_all_rows() before.
RETURN
0 ok
HA_ERR_CRASHED data or index is non-empty.
*/
int heap_enable_indexes(HP_INFO *info)
{
int error= 0;
HP_SHARE *share= info->s;
if (share->data_length || share->index_length)
error= HA_ERR_CRASHED;
else
if (share->currently_disabled_keys)
{
share->keys= share->currently_disabled_keys;
share->currently_disabled_keys= 0;
}
return error;
}
/*
Test if indexes are disabled.
SYNOPSIS
heap_indexes_are_disabled()
info A pointer to the heap storage engine HP_INFO struct.
DESCRIPTION
Test if indexes are disabled.
RETURN
0 indexes are not disabled
1 all indexes are disabled
[2 non-unique indexes are disabled - NOT YET IMPLEMENTED]
*/
int heap_indexes_are_disabled(HP_INFO *info)
{
HP_SHARE *share= info->s;
return (! share->keys && share->currently_disabled_keys);
}
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