sort_calloc
si = sort_calloc(1, sz);
ka = sort_calloc(1, sz);
ret = sort_calloc(1, sizeof(struct file_reader));
void *sort_calloc(size_t, size_t);
ssl = sort_calloc(1, sizeof(struct sort_level));
sl->sublevels = sort_calloc(1, slsz);
sl->sublevels = sort_calloc(1, slsz);
sl = sort_calloc(1, sizeof(struct sort_level));