diff options
Diffstat (limited to 'myisam/mi_open.c')
| -rw-r--r-- | myisam/mi_open.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/myisam/mi_open.c b/myisam/mi_open.c index aeacf81d90a..0da5ebabf40 100644 --- a/myisam/mi_open.c +++ b/myisam/mi_open.c @@ -559,28 +559,36 @@ err: DBUG_RETURN (NULL); } /* mi_open */ + byte *mi_alloc_rec_buff(MI_INFO *info, ulong length, byte **buf) { uint extra; + uint32 old_length; + LINT_INIT(old_length); - if (! *buf || length > mi_get_rec_buff_len(info, *buf)) + if (! *buf || length > (old_length=mi_get_rec_buff_len(info, *buf))) { byte *newptr = *buf; /* to simplify initial init of info->rec_buf in mi_open and mi_extra */ if (length == (ulong) -1) + { length= max(info->s->base.pack_reclength+info->s->base.pack_bits, info->s->base.max_key_length); + /* Avoid unnecessary realloc */ + if (newptr && length == old_length) + return newptr; + } extra= ((info->s->options & HA_OPTION_PACK_RECORD) ? ALIGN_SIZE(MI_MAX_DYN_BLOCK_HEADER)+MI_SPLIT_LENGTH+ MI_REC_BUFF_OFFSET : 0); if (extra && newptr) - newptr-=MI_REC_BUFF_OFFSET; + newptr-= MI_REC_BUFF_OFFSET; if (!(newptr=(byte*) my_realloc((gptr)newptr, length+extra+8, MYF(MY_ALLOW_ZERO_PTR)))) return newptr; - *((uint *)newptr)=length; + *((uint32 *) newptr)= (uint32) length; *buf= newptr+(extra ? MI_REC_BUFF_OFFSET : 0); } return *buf; |