circlequeue.h

这是一个linux下的Shell.有命令历史和命令提示

#ifndef _CIRCLEQUEUE_
#define _CIRCLEQUEUE_
#include <string.h>
struct Node_Queue
{
	Node_Queue(char* p,Node_Queue* nxt,Node_Queue* pr)
	{
		if(p)
		{
			ptr = new char[strlen(p)+1];
			strcpy(ptr,p);
		}
		else
			ptr = 0;

		next = nxt;
		pre  = pr;
	};


	Node_Queue* inset(char* p)
	{
		Node_Queue* o = new Node_Queue(p,this,0);
		this->pre = o;
		return o;
	};

	Node_Queue*  del(void)
	{
		Node_Queue* o = this->pre;
		delete this;
		return o;
	};

	~Node_Queue(void)
	{
		if(pre)
			pre->next = this->next;
		delete ptr;
	};

	char* ptr;
	Node_Queue* next;
	Node_Queue* pre;
};

class CircleQueue
{
public:
	CircleQueue(int size=10);
	void  initffile(char* filepath);
	char* getCur(void);
	void  incCur(void);
	void  devCur(void);
	void  inset(char* p);
	void  setSize(int size);
	void  show(int fid, bool reversFlag);
private:
	void del(void);
private:	
	Node_Queue* head;
	Node_Queue* tail;
	Node_Queue* cur;
	int num;
	int num_cur;
};

#endif