mysh.c

一个实现基本功能的shell命令解释器

/*********************************************/
//File : mysh.c mysh.h
//Function: add_histry  histry_cmd
//Var val : argv[](cmd input)
//Return val: none
//Authir  : Moxudong
//Version : V1.0
//Last amend : 2009-03-05 by Mxd
/*********************************************/
#include "myfun.h"

char add_histry(char *buff, char cmd_histry[][50], int *num)
{
	strcpy(cmd_histry[num[0]], buff);
	num[0]+=1;
	return 0;
}

char *histry_cmd(char cmd_histry[][50], char *a, int *num, char *argv[])
{
	char temp[MAX/8] = "\0", info[MAX/8] = "\0";
	int number = num[0];//The last cmd!!! in here!
	strcpy(info, "[ysh@");
	getcwd(temp, 100);
	strcat(info, temp);
	strcat(info, "]# ");
	while(1)
	{
		printf("\r%s", info);
		if(*a == -1)
		{
			*a = 0;
			if(++number >= num[0])//down
			{
				number = num[0];
				printf("           ");
				printf("\r%s", info);
			}
			else
			{
				printf("\r                                                  ");
				printf("\r%s", info);
				printf("%s", cmd_histry[number]);
			}
		}
		else if(*a == -2) //up
		{
			*a = 0;
			if(--number <= -1)
			{
				number = 0;
			}
			else
			{
				printf("\r                                                ");
				printf("\r%s", info);
				printf("%s", cmd_histry[number]);
			}
		}
		else if(*a == '\r' || '\n')
		{
			printf("\r\n");
			return cmd_histry[number];			
		}
		*a = getch();
	}
		
}