diff options
Diffstat (limited to 'storage/heap/hp_rfirst.c')
-rw-r--r-- | storage/heap/hp_rfirst.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/storage/heap/hp_rfirst.c b/storage/heap/hp_rfirst.c new file mode 100644 index 00000000000..85548fea212 --- /dev/null +++ b/storage/heap/hp_rfirst.c @@ -0,0 +1,61 @@ +/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or + (at your option) any later version. + + 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 */ + +#include "heapdef.h" + +/* Read first record with the current key */ + +int heap_rfirst(HP_INFO *info, byte *record, int inx) +{ + HP_SHARE *share = info->s; + HP_KEYDEF *keyinfo = share->keydef + inx; + + DBUG_ENTER("heap_rfirst"); + info->lastinx= inx; + if (keyinfo->algorithm == HA_KEY_ALG_BTREE) + { + byte *pos; + + if ((pos = tree_search_edge(&keyinfo->rb_tree, info->parents, + &info->last_pos, offsetof(TREE_ELEMENT, left)))) + { + memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos), + sizeof(byte*)); + info->current_ptr = pos; + memcpy(record, pos, (size_t)share->reclength); + info->update = HA_STATE_AKTIV; + } + else + { + my_errno = HA_ERR_END_OF_FILE; + DBUG_RETURN(my_errno); + } + DBUG_RETURN(0); + } + else + { + if (!(info->s->records)) + { + my_errno=HA_ERR_END_OF_FILE; + DBUG_RETURN(my_errno); + } + DBUG_ASSERT(0); /* TODO fix it */ + info->current_record=0; + info->current_hash_ptr=0; + info->update=HA_STATE_PREV_FOUND; + DBUG_RETURN(heap_rnext(info,record)); + } +} |