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Issue 16398: Add assertions to show why memcmp is safe.

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Raymond Hettinger 2013-02-02 11:24:43 -08:00
parent 21777acd68
commit 231ee4dc9d
1 changed files with 4 additions and 1 deletions
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5
Modules/_collectionsmodule.c
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@ -425,8 +425,9 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
else if (n < -halflen) else if (n < -halflen)
n += len; n += len;
} }
assert(deque->len > 1); assert(deque->len > 1);
assert((n < len / 2) || (n > len / -2));
deque->state++; deque->state++;
for (i=0 ; i<n ; ) { for (i=0 ; i<n ; ) {
if (deque->leftindex == 0) { if (deque->leftindex == 0) {
@ -446,6 +447,8 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
if (m > deque->leftindex) if (m > deque->leftindex)
m = deque->leftindex; m = deque->leftindex;
assert (m > 0); assert (m > 0);
assert (deque->leftblock != deque->rightblock ||
deque->leftindex < deque->rightindex - m + 1);
memcpy(&deque->leftblock->data[deque->leftindex - m], memcpy(&deque->leftblock->data[deque->leftindex - m],
&deque->rightblock->data[deque->rightindex - m + 1], &deque->rightblock->data[deque->rightindex - m + 1],
m * sizeof(PyObject *)); m * sizeof(PyObject *));