diff options
Diffstat (limited to 'storage/heap/hp_rrnd.c')
| -rw-r--r-- | storage/heap/hp_rrnd.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/storage/heap/hp_rrnd.c b/storage/heap/hp_rrnd.c new file mode 100644 index 00000000..3947946c --- /dev/null +++ b/storage/heap/hp_rrnd.c @@ -0,0 +1,50 @@ +/* Copyright (c) 2000-2002, 2004-2007 MySQL AB + Use is subject to license terms + + 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Read a record from a random position */ + +#include "heapdef.h" + +/* + Returns one of following values: + 0 = Ok. + HA_ERR_RECORD_DELETED = Record is deleted. + HA_ERR_END_OF_FILE = EOF. +*/ + +int heap_rrnd(register HP_INFO *info, uchar *record, uchar *pos) +{ + HP_SHARE *share=info->s; + DBUG_ENTER("heap_rrnd"); + DBUG_PRINT("enter",("info: %p pos: %p", info, pos)); + + info->lastinx= -1; + if (!(info->current_ptr= pos)) + { + info->update= 0; + DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE); + } + if (!info->current_ptr[share->visible]) + { + info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND; + DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED); + } + info->update=HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV; + memcpy(record,info->current_ptr,(size_t) share->reclength); + DBUG_PRINT("exit", ("found record at %p", info->current_ptr)); + info->current_hash_ptr=0; /* Can't use rnext */ + DBUG_RETURN(0); +} /* heap_rrnd */ |