/*
* BT_BROOT -- Fix up the btree root page after it has been split.
*
* Parameters:
* t: tree
* h: root page
* l: left page
* r: right page
*
* Returns:
* RET_ERROR, RET_SUCCESS
*/
static int
bt_broot(BTREE *t, PAGE *h, PAGE *l, PAGE *r)
{
BINTERNAL *bi;
BLEAF *bl;
u_int32_t nbytes;
char *dest;
/*
* If the root page was a leaf page, change it into an internal page.
* We copy the key we split on (but not the key's data, in the case of
* a leaf page) to the new root page.
*
* The btree comparison code guarantees that the left-most key on any
* level of the tree is never used, so it doesn't need to be filled in.
*/
nbytes = NBINTERNAL(0);
h->linp[0] = h->upper = t->bt_psize - nbytes;
dest = (char *)h + h->upper;
WR_BINTERNAL(dest, 0, l->pgno, 0);
switch (h->flags & P_TYPE) {
case P_BLEAF:
bl = GETBLEAF(r, 0);
nbytes = NBINTERNAL(bl->ksize);
__PAST_END(h->linp, 1) = h->upper -= nbytes;
dest = (char *)h + h->upper;
WR_BINTERNAL(dest, bl->ksize, r->pgno, 0);
memmove(dest, bl->bytes, bl->ksize);
/*
* If the key is on an overflow page, mark the overflow chain
* so it isn't deleted when the leaf copy of the key is deleted.
*/
if (bl->flags & P_BIGKEY &&
bt_preserve(t, *(pgno_t *)bl->bytes) == RET_ERROR)
return (RET_ERROR);
break;
case P_BINTERNAL:
bi = GETBINTERNAL(r, 0);
nbytes = NBINTERNAL(bi->ksize);
__PAST_END(h->linp, 1) = h->upper -= nbytes;
dest = (char *)h + h->upper;
memmove(dest, bi, nbytes);
((BINTERNAL *)dest)->pgno = r->pgno;
break;
default:
abort();
}
/* There are two keys on the page. */
h->lower = BTDATAOFF + 2 * sizeof(indx_t);
/* Unpin the root page, set to btree internal page. */
h->flags &= ~P_TYPE;
h->flags |= P_BINTERNAL;
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
return (RET_SUCCESS);
}
/*
* __BT_CMP -- Compare a key to a given record.
*
* Parameters:
* t: tree
* k1: DBT pointer of first arg to comparison
* e: pointer to EPG for comparison
*
* Returns:
* < 0 if k1 is < record
* = 0 if k1 is = record
* > 0 if k1 is > record
*/
int
__bt_cmp(BTREE *t, const DBT *k1, EPG *e)
{
BINTERNAL *bi;
BLEAF *bl;
DBT k2;
PAGE *h;
void *bigkey;
/*
* The left-most key on internal pages, at any level of the tree, is
* guaranteed by the following code to be less than any user key.
* This saves us from having to update the leftmost key on an internal
* page when the user inserts a new key in the tree smaller than
* anything we've yet seen.
*/
h = e->page;
if (e->index == 0 && h->prevpg == P_INVALID && !(h->flags & P_BLEAF))
return (1);
bigkey = NULL;
if (h->flags & P_BLEAF) {
bl = GETBLEAF(h, e->index);
if (bl->flags & P_BIGKEY)
bigkey = bl->bytes;
else {
k2.data = bl->bytes;
k2.size = bl->ksize;
}
} else {
bi = GETBINTERNAL(h, e->index);
if (bi->flags & P_BIGKEY)
bigkey = bi->bytes;
else {
k2.data = bi->bytes;
k2.size = bi->ksize;
}
}
if (bigkey) {
if (__ovfl_get(t, bigkey,
&k2.size, &t->bt_rdata.data, &t->bt_rdata.size))
return (RET_ERROR);
k2.data = t->bt_rdata.data;
}
return ((*t->bt_cmp)(k1, &k2));
}
/*
* __bt_dleaf --
* Delete a single record from a leaf page.
*
* Parameters:
* t: tree
* key: referenced key
* h: page
* idx: index on page to delete
*
* Returns:
* RET_SUCCESS, RET_ERROR.
*/
int
__bt_dleaf(BTREE *t, const DBT *key, PAGE *h, u_int idx)
{
BLEAF *bl;
indx_t cnt, *ip, offset;
u_int32_t nbytes;
void *to;
char *from;
/* If this record is referenced by the cursor, delete the cursor. */
if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
!F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index == idx &&
__bt_curdel(t, key, h, idx))
return (RET_ERROR);
/* If the entry uses overflow pages, make them available for reuse. */
to = bl = GETBLEAF(h, idx);
if (bl->flags & P_BIGKEY && __ovfl_delete(t, bl->bytes) == RET_ERROR)
return (RET_ERROR);
if (bl->flags & P_BIGDATA &&
__ovfl_delete(t, bl->bytes + bl->ksize) == RET_ERROR)
return (RET_ERROR);
/* Pack the remaining key/data items at the end of the page. */
nbytes = NBLEAF(bl);
from = (char *)h + h->upper;
memmove(from + nbytes, from, (char *)to - from);
h->upper += nbytes;
/* Adjust the indices' offsets, shift the indices down. */
offset = h->linp[idx];
for (cnt = idx, ip = &h->linp[0]; cnt--; ++ip)
if (ip[0] < offset)
ip[0] += nbytes;
for (cnt = NEXTINDEX(h) - idx; --cnt; ++ip)
ip[0] = ip[1] < offset ? ip[1] + nbytes : ip[1];
h->lower -= sizeof(indx_t);
/* If the cursor is on this page, adjust it as necessary. */
if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
!F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index > idx)
--t->bt_cursor.pg.index;
return (RET_SUCCESS);
}
/*
* __bt_ret --
* Build return key/data pair.
*
* Parameters:
* t: tree
* e: key/data pair to be returned
* key: user's key structure (NULL if not to be filled in)
* rkey: memory area to hold key
* data: user's data structure (NULL if not to be filled in)
* rdata: memory area to hold data
* copy: always copy the key/data item
*
* Returns:
* RET_SUCCESS, RET_ERROR.
*/
int
__bt_ret(BTREE *t, EPG *e, DBT *key, DBT *rkey, DBT *data, DBT *rdata, int copy)
{
BLEAF *bl;
void *p;
bl = GETBLEAF(e->page, e->index);
/*
* We must copy big keys/data to make them contiguous. Otherwise,
* leave the page pinned and don't copy unless the user specified
* concurrent access.
*/
if (key == NULL)
goto dataonly;
if (bl->flags & P_BIGKEY) {
if (__ovfl_get(t, bl->bytes,
&key->size, &rkey->data, &rkey->size))
return (RET_ERROR);
key->data = rkey->data;
} else if (copy || F_ISSET(t, B_DB_LOCK)) {
if (bl->ksize > rkey->size) {
p = (void *)(rkey->data == NULL ?
malloc(bl->ksize) : realloc(rkey->data, bl->ksize));
if (p == NULL)
return (RET_ERROR);
rkey->data = p;
rkey->size = bl->ksize;
}
memmove(rkey->data, bl->bytes, bl->ksize);
key->size = bl->ksize;
key->data = rkey->data;
} else {
key->size = bl->ksize;
key->data = bl->bytes;
}
dataonly:
if (data == NULL)
return (RET_SUCCESS);
if (bl->flags & P_BIGDATA) {
if (__ovfl_get(t, bl->bytes + bl->ksize,
&data->size, &rdata->data, &rdata->size))
return (RET_ERROR);
data->data = rdata->data;
} else if (copy || F_ISSET(t, B_DB_LOCK)) {
/* Use +1 in case the first record retrieved is 0 length. */
if (bl->dsize + 1 > rdata->size) {
p = (void *)(rdata->data == NULL ?
malloc(bl->dsize + 1) :
realloc(rdata->data, bl->dsize + 1));
if (p == NULL)
return (RET_ERROR);
rdata->data = p;
rdata->size = bl->dsize + 1;
}
memmove(rdata->data, bl->bytes + bl->ksize, bl->dsize);
data->size = bl->dsize;
data->data = rdata->data;
} else {
data->size = bl->dsize;
data->data = bl->bytes + bl->ksize;
}
return (RET_SUCCESS);
}
/*
* __BT_BPGIN, __BT_BPGOUT --
* Convert host-specific number layout to/from the host-independent
* format stored on disk.
*
* Parameters:
* t: tree
* pg: page number
* h: page to convert
*/
void
__bt_pgin(void *t, pgno_t pg, void *pp)
{
PAGE *h;
indx_t i, top;
u_char flags;
char *p;
if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
return;
if (pg == P_META) {
mswap(pp);
return;
}
h = pp;
M_32_SWAP(h->pgno);
M_32_SWAP(h->prevpg);
M_32_SWAP(h->nextpg);
M_32_SWAP(h->flags);
M_16_SWAP(h->lower);
M_16_SWAP(h->upper);
top = NEXTINDEX(h);
if ((h->flags & P_TYPE) == P_BINTERNAL)
for (i = 0; i < top; i++) {
M_16_SWAP(h->linp[i]);
p = (char *)GETBINTERNAL(h, i);
P_32_SWAP(p);
p += sizeof(u_int32_t);
P_32_SWAP(p);
p += sizeof(pgno_t);
if (*(u_char *)p & P_BIGKEY) {
p += sizeof(u_char);
P_32_SWAP(p);
p += sizeof(pgno_t);
P_32_SWAP(p);
}
}
else if ((h->flags & P_TYPE) == P_BLEAF)
for (i = 0; i < top; i++) {
M_16_SWAP(h->linp[i]);
p = (char *)GETBLEAF(h, i);
P_32_SWAP(p);
p += sizeof(u_int32_t);
P_32_SWAP(p);
p += sizeof(u_int32_t);
flags = *(u_char *)p;
if (flags & (P_BIGKEY | P_BIGDATA)) {
p += sizeof(u_char);
if (flags & P_BIGKEY) {
P_32_SWAP(p);
p += sizeof(pgno_t);
P_32_SWAP(p);
}
if (flags & P_BIGDATA) {
p += sizeof(u_int32_t);
P_32_SWAP(p);
p += sizeof(pgno_t);
P_32_SWAP(p);
}
}
}
}
/*
* __BT_SPLIT -- Split the tree.
*
* Parameters:
* t: tree
* sp: page to split
* key: key to insert
* data: data to insert
* flags: BIGKEY/BIGDATA flags
* ilen: insert length
* skip: index to leave open
*
* Returns:
* RET_ERROR, RET_SUCCESS
*/
int
__bt_split(BTREE *t, PAGE *sp, const DBT *key, const DBT *data, int flags,
size_t ilen, u_int32_t argskip)
{
BINTERNAL *bi;
BLEAF *bl, *tbl;
DBT a, b;
EPGNO *parent;
PAGE *h, *l, *r, *lchild, *rchild;
indx_t nxtindex;
u_int16_t skip;
u_int32_t n, nbytes, nksize;
int parentsplit;
char *dest;
/*
* Split the page into two pages, l and r. The split routines return
* a pointer to the page into which the key should be inserted and with
* skip set to the offset which should be used. Additionally, l and r
* are pinned.
*/
skip = argskip;
h = sp->pgno == P_ROOT ?
bt_root(t, sp, &l, &r, &skip, ilen) :
bt_page(t, sp, &l, &r, &skip, ilen);
if (h == NULL)
return (RET_ERROR);
/*
* Insert the new key/data pair into the leaf page. (Key inserts
* always cause a leaf page to split first.)
*/
h->linp[skip] = h->upper -= ilen;
dest = (char *)h + h->upper;
if (F_ISSET(t, R_RECNO))
WR_RLEAF(dest, data, flags)
else
WR_BLEAF(dest, key, data, flags)
/* If the root page was split, make it look right. */
if (sp->pgno == P_ROOT &&
(F_ISSET(t, R_RECNO) ?
bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
goto err2;
/*
* Now we walk the parent page stack -- a LIFO stack of the pages that
* were traversed when we searched for the page that split. Each stack
* entry is a page number and a page index offset. The offset is for
* the page traversed on the search. We've just split a page, so we
* have to insert a new key into the parent page.
*
* If the insert into the parent page causes it to split, may have to
* continue splitting all the way up the tree. We stop if the root
* splits or the page inserted into didn't have to split to hold the
* new key. Some algorithms replace the key for the old page as well
* as the new page. We don't, as there's no reason to believe that the
* first key on the old page is any better than the key we have, and,
* in the case of a key being placed at index 0 causing the split, the
* key is unavailable.
*
* There are a maximum of 5 pages pinned at any time. We keep the left
* and right pages pinned while working on the parent. The 5 are the
* two children, left parent and right parent (when the parent splits)
* and the root page or the overflow key page when calling bt_preserve.
* This code must make sure that all pins are released other than the
* root page or overflow page which is unlocked elsewhere.
*/
while ((parent = BT_POP(t)) != NULL) {
lchild = l;
rchild = r;
/* Get the parent page. */
if ((h = mpool_get(t->bt_mp, parent->pgno, 0)) == NULL)
goto err2;
/*
* The new key goes ONE AFTER the index, because the split
* was to the right.
*/
skip = parent->index + 1;
/*
* Calculate the space needed on the parent page.
*
* Prefix trees: space hack when inserting into BINTERNAL
* pages. Retain only what's needed to distinguish between
* the new entry and the LAST entry on the page to its left.
* If the keys compare equal, retain the entire key. Note,
* we don't touch overflow keys, and the entire key must be
* retained for the next-to-left most key on the leftmost
* page of each level, or the search will fail. Applicable
* ONLY to internal pages that have leaf pages as children.
* Further reduction of the key between pairs of internal
* pages loses too much information.
*/
switch (rchild->flags & P_TYPE) {
case P_BINTERNAL:
bi = GETBINTERNAL(rchild, 0);
nbytes = NBINTERNAL(bi->ksize);
break;
case P_BLEAF:
bl = GETBLEAF(rchild, 0);
nbytes = NBINTERNAL(bl->ksize);
if (t->bt_pfx && !(bl->flags & P_BIGKEY) &&
(h->prevpg != P_INVALID || skip > 1)) {
tbl = GETBLEAF(lchild, NEXTINDEX(lchild) - 1);
a.size = tbl->ksize;
a.data = tbl->bytes;
b.size = bl->ksize;
b.data = bl->bytes;
nksize = t->bt_pfx(&a, &b);
n = NBINTERNAL(nksize);
if (n < nbytes) {
#ifdef STATISTICS
bt_pfxsaved += nbytes - n;
#endif
nbytes = n;
} else
nksize = 0;
} else
nksize = 0;
break;
case P_RINTERNAL:
case P_RLEAF:
nbytes = NRINTERNAL;
break;
default:
abort();
}
/* Split the parent page if necessary or shift the indices. */
if ((u_int32_t)(h->upper - h->lower) < nbytes + sizeof(indx_t)) {
sp = h;
h = h->pgno == P_ROOT ?
bt_root(t, h, &l, &r, &skip, nbytes) :
bt_page(t, h, &l, &r, &skip, nbytes);
if (h == NULL)
goto err1;
parentsplit = 1;
} else {
if (skip < (nxtindex = NEXTINDEX(h)))
memmove(h->linp + skip + 1, h->linp + skip,
(nxtindex - skip) * sizeof(indx_t));
h->lower += sizeof(indx_t);
parentsplit = 0;
}
/* Insert the key into the parent page. */
switch (rchild->flags & P_TYPE) {
case P_BINTERNAL:
h->linp[skip] = h->upper -= nbytes;
dest = (char *)h + h->linp[skip];
memmove(dest, bi, nbytes);
((BINTERNAL *)dest)->pgno = rchild->pgno;
break;
case P_BLEAF:
h->linp[skip] = h->upper -= nbytes;
dest = (char *)h + h->linp[skip];
WR_BINTERNAL(dest, nksize ? nksize : bl->ksize,
rchild->pgno, bl->flags & P_BIGKEY);
memmove(dest, bl->bytes, nksize ? nksize : bl->ksize);
if (bl->flags & P_BIGKEY) {
pgno_t pgno;
memcpy(&pgno, bl->bytes, sizeof(pgno));
if (bt_preserve(t, pgno) == RET_ERROR)
goto err1;
}
break;
case P_RINTERNAL:
/*
* Update the left page count. If split
* added at index 0, fix the correct page.
*/
if (skip > 0)
dest = (char *)h + h->linp[skip - 1];
else
dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
((RINTERNAL *)dest)->nrecs = rec_total(lchild);
((RINTERNAL *)dest)->pgno = lchild->pgno;
/* Update the right page count. */
h->linp[skip] = h->upper -= nbytes;
dest = (char *)h + h->linp[skip];
((RINTERNAL *)dest)->nrecs = rec_total(rchild);
((RINTERNAL *)dest)->pgno = rchild->pgno;
break;
case P_RLEAF:
/*
* Update the left page count. If split
* added at index 0, fix the correct page.
*/
if (skip > 0)
dest = (char *)h + h->linp[skip - 1];
else
dest = (char *)l + l->linp[NEXTINDEX(l) - 1];
((RINTERNAL *)dest)->nrecs = NEXTINDEX(lchild);
((RINTERNAL *)dest)->pgno = lchild->pgno;
/* Update the right page count. */
h->linp[skip] = h->upper -= nbytes;
dest = (char *)h + h->linp[skip];
((RINTERNAL *)dest)->nrecs = NEXTINDEX(rchild);
((RINTERNAL *)dest)->pgno = rchild->pgno;
break;
default:
abort();
}
/* Unpin the held pages. */
if (!parentsplit) {
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
break;
}
/* If the root page was split, make it look right. */
if (sp->pgno == P_ROOT &&
(F_ISSET(t, R_RECNO) ?
bt_rroot(t, sp, l, r) : bt_broot(t, sp, l, r)) == RET_ERROR)
goto err1;
mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
}
/* Unpin the held pages. */
mpool_put(t->bt_mp, l, MPOOL_DIRTY);
mpool_put(t->bt_mp, r, MPOOL_DIRTY);
/* Clear any pages left on the stack. */
return (RET_SUCCESS);
/*
* If something fails in the above loop we were already walking back
* up the tree and the tree is now inconsistent. Nothing much we can
* do about it but release any memory we're holding.
*/
err1: mpool_put(t->bt_mp, lchild, MPOOL_DIRTY);
mpool_put(t->bt_mp, rchild, MPOOL_DIRTY);
err2: mpool_put(t->bt_mp, l, 0);
mpool_put(t->bt_mp, r, 0);
__dbpanic(t->bt_dbp);
return (RET_ERROR);
}
/*
* BT_PSPLIT -- Do the real work of splitting the page.
*
* Parameters:
* t: tree
* h: page to be split
* l: page to put lower half of data
* r: page to put upper half of data
* pskip: pointer to index to leave open
* ilen: insert length
*
* Returns:
* Pointer to page in which to insert.
*/
static PAGE *
bt_psplit(BTREE *t, PAGE *h, PAGE *l, PAGE *r, indx_t *pskip, size_t ilen)
{
BINTERNAL *bi;
BLEAF *bl;
CURSOR *c;
RLEAF *rl;
PAGE *rval;
void *src;
indx_t full, half, nxt, off, skip, top, used;
u_int32_t nbytes;
int bigkeycnt, isbigkey;
/*
* Split the data to the left and right pages. Leave the skip index
* open. Additionally, make some effort not to split on an overflow
* key. This makes internal page processing faster and can save
* space as overflow keys used by internal pages are never deleted.
*/
bigkeycnt = 0;
skip = *pskip;
full = t->bt_psize - BTDATAOFF;
half = full / 2;
used = 0;
for (nxt = off = 0, top = NEXTINDEX(h); nxt < top; ++off) {
if (skip == off) {
nbytes = ilen;
isbigkey = 0; /* XXX: not really known. */
} else
switch (h->flags & P_TYPE) {
case P_BINTERNAL:
src = bi = GETBINTERNAL(h, nxt);
nbytes = NBINTERNAL(bi->ksize);
isbigkey = bi->flags & P_BIGKEY;
break;
case P_BLEAF:
src = bl = GETBLEAF(h, nxt);
nbytes = NBLEAF(bl);
isbigkey = bl->flags & P_BIGKEY;
break;
case P_RINTERNAL:
src = GETRINTERNAL(h, nxt);
nbytes = NRINTERNAL;
isbigkey = 0;
break;
case P_RLEAF:
src = rl = GETRLEAF(h, nxt);
nbytes = NRLEAF(rl);
isbigkey = 0;
break;
default:
abort();
}
/*
* If the key/data pairs are substantial fractions of the max
* possible size for the page, it's possible to get situations
* where we decide to try and copy too much onto the left page.
* Make sure that doesn't happen.
*/
if ((skip <= off && used + nbytes + sizeof(indx_t) >= full) ||
nxt == top - 1) {
--off;
break;
}
/* Copy the key/data pair, if not the skipped index. */
if (skip != off) {
++nxt;
l->linp[off] = l->upper -= nbytes;
memmove((char *)l + l->upper, src, nbytes);
}
used += nbytes + sizeof(indx_t);
if (used >= half) {
if (!isbigkey || bigkeycnt == 3)
break;
else
++bigkeycnt;
}
}
/*
* Off is the last offset that's valid for the left page.
* Nxt is the first offset to be placed on the right page.
*/
l->lower += (off + 1) * sizeof(indx_t);
/*
* If splitting the page that the cursor was on, the cursor has to be
* adjusted to point to the same record as before the split. If the
* cursor is at or past the skipped slot, the cursor is incremented by
* one. If the cursor is on the right page, it is decremented by the
* number of records split to the left page.
*/
c = &t->bt_cursor;
if (F_ISSET(c, CURS_INIT) && c->pg.pgno == h->pgno) {
if (c->pg.index >= skip)
++c->pg.index;
if (c->pg.index < nxt) /* Left page. */
c->pg.pgno = l->pgno;
else { /* Right page. */
c->pg.pgno = r->pgno;
c->pg.index -= nxt;
}
}
/*
* If the skipped index was on the left page, just return that page.
* Otherwise, adjust the skip index to reflect the new position on
* the right page.
*/
if (skip <= off) {
skip = MAX_PAGE_OFFSET;
rval = l;
} else {
rval = r;
*pskip -= nxt;
}
for (off = 0; nxt < top; ++off) {
if (skip == nxt) {
++off;
skip = MAX_PAGE_OFFSET;
}
switch (h->flags & P_TYPE) {
case P_BINTERNAL:
src = bi = GETBINTERNAL(h, nxt);
nbytes = NBINTERNAL(bi->ksize);
break;
case P_BLEAF:
src = bl = GETBLEAF(h, nxt);
nbytes = NBLEAF(bl);
break;
case P_RINTERNAL:
src = GETRINTERNAL(h, nxt);
nbytes = NRINTERNAL;
break;
case P_RLEAF:
src = rl = GETRLEAF(h, nxt);
nbytes = NRLEAF(rl);
break;
default:
abort();
}
++nxt;
r->linp[off] = r->upper -= nbytes;
memmove((char *)r + r->upper, src, nbytes);
}
r->lower += off * sizeof(indx_t);
/* If the key is being appended to the page, adjust the index. */
if (skip == top)
r->lower += sizeof(indx_t);
return (rval);
}
/*
* BT_DPAGE -- Dump the page
*
* Parameters:
* h: pointer to the PAGE
*/
void
__bt_dpage(PAGE *h)
{
BINTERNAL *bi;
BLEAF *bl;
RINTERNAL *ri;
RLEAF *rl;
indx_t cur, top;
char *sep;
(void)fprintf(stderr, " page %u: (", h->pgno);
#undef X
#define X(flag, name) \
if (h->flags & flag) { \
(void)fprintf(stderr, "%s%s", sep, name); \
sep = ", "; \
}
sep = "";
X(P_BINTERNAL, "BINTERNAL") /* types */
X(P_BLEAF, "BLEAF")
X(P_RINTERNAL, "RINTERNAL") /* types */
X(P_RLEAF, "RLEAF")
X(P_OVERFLOW, "OVERFLOW")
X(P_PRESERVE, "PRESERVE");
(void)fprintf(stderr, ")\n");
#undef X
(void)fprintf(stderr, "\tprev %2u next %2u", h->prevpg, h->nextpg);
if (h->flags & P_OVERFLOW)
return;
top = NEXTINDEX(h);
(void)fprintf(stderr, " lower %3d upper %3d nextind %d\n",
h->lower, h->upper, top);
for (cur = 0; cur < top; cur++) {
(void)fprintf(stderr, "\t[%03d] %4d ", cur, h->linp[cur]);
switch (h->flags & P_TYPE) {
case P_BINTERNAL:
bi = GETBINTERNAL(h, cur);
(void)fprintf(stderr,
"size %03d pgno %03d", bi->ksize, bi->pgno);
if (bi->flags & P_BIGKEY)
(void)fprintf(stderr, " (indirect)");
else if (bi->ksize)
(void)fprintf(stderr,
" {%.*s}", (int)bi->ksize, bi->bytes);
break;
case P_RINTERNAL:
ri = GETRINTERNAL(h, cur);
(void)fprintf(stderr, "entries %03d pgno %03d",
ri->nrecs, ri->pgno);
break;
case P_BLEAF:
bl = GETBLEAF(h, cur);
if (bl->flags & P_BIGKEY)
(void)fprintf(stderr,
"big key page %u size %u/",
*(pgno_t *)bl->bytes,
*(u_int32_t *)(bl->bytes + sizeof(pgno_t)));
else if (bl->ksize)
(void)fprintf(stderr, "%s/", bl->bytes);
if (bl->flags & P_BIGDATA)
(void)fprintf(stderr,
"big data page %u size %u",
*(pgno_t *)(bl->bytes + bl->ksize),
*(u_int32_t *)(bl->bytes + bl->ksize +
sizeof(pgno_t)));
else if (bl->dsize)
(void)fprintf(stderr, "%.*s",
(int)bl->dsize, bl->bytes + bl->ksize);
break;
case P_RLEAF:
rl = GETRLEAF(h, cur);
if (rl->flags & P_BIGDATA)
(void)fprintf(stderr,
"big data page %u size %u",
*(pgno_t *)rl->bytes,
*(u_int32_t *)(rl->bytes + sizeof(pgno_t)));
else if (rl->dsize)
(void)fprintf(stderr,
"%.*s", (int)rl->dsize, rl->bytes);
break;
}
(void)fprintf(stderr, "\n");
}
}