/*
* __curfile_compare --
* WT_CURSOR->compare method for the btree cursor type.
*/
static int
__curfile_compare(WT_CURSOR *a, WT_CURSOR *b, int *cmpp)
{
WT_CURSOR_BTREE *cbt;
WT_DECL_RET;
WT_SESSION_IMPL *session;
cbt = (WT_CURSOR_BTREE *)a;
CURSOR_API_CALL(a, session, compare, cbt->btree);
/*
* Check both cursors are a "file:" type then call the underlying
* function, it can handle cursors pointing to different objects.
*/
if (!WT_PREFIX_MATCH(a->internal_uri, "file:") ||
!WT_PREFIX_MATCH(b->internal_uri, "file:"))
WT_ERR_MSG(session, EINVAL,
"Cursors must reference the same object");
WT_CURSOR_CHECKKEY(a);
WT_CURSOR_CHECKKEY(b);
ret = __wt_btcur_compare(
(WT_CURSOR_BTREE *)a, (WT_CURSOR_BTREE *)b, cmpp);
err: API_END_RET(session, ret);
}
/*
* __wt_btcur_equals --
* Return an equality comparison between two cursors.
*/
int
__wt_btcur_equals(WT_CURSOR_BTREE *a_arg, WT_CURSOR_BTREE *b_arg, int *equalp)
{
WT_CURSOR *a, *b;
WT_SESSION_IMPL *session;
int cmp;
a = (WT_CURSOR *)a_arg;
b = (WT_CURSOR *)b_arg;
cmp = 0;
session = (WT_SESSION_IMPL *)a->session;
/* Confirm both cursors reference the same object. */
if (a_arg->btree != b_arg->btree)
WT_RET_MSG(
session, EINVAL, "Cursors must reference the same object");
/*
* The reason for an equals method is because we can avoid doing
* a full key comparison in some cases. If both cursors point into the
* tree, take the fast path, otherwise fall back to the slower compare
* method; in both cases, return 1 if the cursors are equal, 0 if they
* are not.
*/
if (F_ISSET(a, WT_CURSTD_KEY_INT) && F_ISSET(b, WT_CURSTD_KEY_INT))
*equalp = __cursor_equals(a_arg, b_arg);
else {
WT_RET(__wt_btcur_compare(a_arg, b_arg, &cmp));
*equalp = (cmp == 0) ? 1 : 0;
}
return (0);
}
/*
* __curfile_compare --
* WT_CURSOR->compare method for the btree cursor type.
*/
static int
__curfile_compare(WT_CURSOR *a, WT_CURSOR *b, int *cmpp)
{
WT_CURSOR_BTREE *cbt;
WT_DECL_RET;
WT_SESSION_IMPL *session;
cbt = (WT_CURSOR_BTREE *)a;
CURSOR_API_CALL(a, session, compare, cbt->btree);
/*
* Confirm both cursors refer to the same source and have keys, then
* call the underlying object to compare them.
*/
if (strcmp(a->uri, b->uri) != 0)
WT_ERR_MSG(session, EINVAL,
"comparison method cursors must reference the same object");
WT_CURSOR_NEEDKEY(a);
WT_CURSOR_NEEDKEY(b);
ret = __wt_btcur_compare(
(WT_CURSOR_BTREE *)a, (WT_CURSOR_BTREE *)b, cmpp);
err: API_END(session);
return (ret);
}
