Function raxPrev

app/redis-6.2.6/src/rax.c:1711–1721

Go to the previous element in the scope of the iterator 'it'. * If EOF (or out of memory) is reached, 0 is returned, otherwise 1 is * returned. In case 0 is returned because of OOM, errno is set to ENOMEM. */

 * If EOF (or out of memory) is reached, 0 is returned, otherwise 1 is
 * returned. In case 0 is returned because of OOM, errno is set to ENOMEM. */
int raxPrev(raxIterator *it) {
    if (!raxIteratorPrevStep(it,0)) {
        errno = ENOMEM;
        return 0;
    }
    if (it->flags & RAX_ITER_EOF) {
        errno = 0;
        return 0;
    }
    return 1;
}

/* Perform a random walk starting in the current position of the iterator.
 * Return 0 if the tree is empty or on out of memory. Otherwise 1 is returned