Function tsearch

examples/stdlib.c:5446–5450

    return n;
}
static void *tsearch(const void *key, void **root,
    int (*compare)(const void *, const void *))
{
    return pool_tsearch(NULL, key, root, compare);
}

static void *tfind(const void *key, void **root,
    int (*compare)(const void *, const void *))