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Deletion case 2c can shift the root; case 3b is not the only case that

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can do that. The bad case happens when you have a root node containing
only one actual element, and its two child nodes have only one element
each, and you try to delete the element in the root.

[originally from svn r660]
This commit is contained in:
Simon Tatham 2000-10-02 11:47:30 +00:00
parent 4471e3fe6c
commit 4a2ea18a51
1 changed files with 11 additions and 0 deletions
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11
tree234.c
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@ -569,6 +569,17 @@ void del234(tree234 *t, void *e) {
} }
n->elems[j] = NULL; n->elems[j] = NULL;
n->kids[j+1] = NULL; n->kids[j+1] = NULL;
/*
* It's possible, in this case, that we've just removed
* the only element in the root of the tree. If so,
* shift the root.
*/
if (n->elems[0] == NULL) {
LOG((" shifting root!\n"));
t->root = a;
a->parent = NULL;
sfree(n);
}
/* /*
* Now go round the deletion process again, with n * Now go round the deletion process again, with n
* pointing at the new big node and e still the same. * pointing at the new big node and e still the same.