gistfile1.c

typedef int(*BuffOp)(char* buffer, void* ctx);

struct OpNode {
	BuffOp op;
	struct OpNode *next;
	void* ctx;
};

int call_chain(struct OpNode* node, char* buffer) {
	int rv;
	if ((rv = node->op(buffer, node->ctx)) < 0) {
		return rv;
	}

	if (node->next == 0) {
		return 0;
	}

	return call_chain(node->next, buffer);
}

struct SelectCoreArgs {
	int core_num;
};

int select_core(char* buffer, void* ctx) {
	struct SelectCoreArgs *args = ctx;
	// Selecting core
	return 0;
}

int do_something(char* buffer, void* ctx) {
	return 0;
}

int main() {
	char *buffer = "Hello World";

	struct OpNode op;
	op.op = do_something;
	op.ctx = op.next = 0;

	struct OpNode select;
	select.op = select_core;
	struct SelectCoreArgs args;
	args.core_num = 32;
	select.ctx = &args;
	select.next = &op;

	call_chain(&select, buffer);
}