log.c

基于UNIX6的文件系统模拟程序

#include <stdio.h>
#include <string.h>
#include "filesys.h"


int login(uid,passwd)
unsigned short uid;
char *passwd;
{
	int i,j;

	//printf("\nin login pwd[2].uid:%d ,pwd:%s\n",pwd[2].p_uid,pwd[2].password);
	for(i=0;i<PWDNUM;i++)
	{
		if((uid == pwd[i].p_uid)&&!(strcmp(passwd,pwd[i].password)))
		{
			for(j=0;j<USERNUM;j++)//I change i++ to j++
				if(user[j].u_uid == 0)  break;
			if(j==USERNUM)
			{
				printf("\ntoo many user in the system,waited to login\n");
				return 0;
			}
			else
			{
				user[j].u_uid = uid;
				user[j].u_gid = pwd[i].p_gid;
				user[j].u_default_mode = DEFAULTMODE;
			}
			break;
		}
	}
	if(i==PWDNUM)
	{
		printf("\nincorrect password\n");
		return 0;
	}
	else
		return 1;

}



int logout(uid)
unsigned short uid;
{
	int i,j,sys_no;
	struct inode *inode;

	for(i=0;i<USERNUM;i++)
		if(uid==user[i].u_uid)  break;
	if(i==USERNUM)
	{
		printf("\nno such a file\n");
		return NULL;
	}

	for(j=0;j<NOFILE;j++)
	{
		if(user[i].u_ofile[j]!=SYSOPENFILE+1)
		{
			/* iput the inode free the sys_ofile and clear the user_ofile */
			sys_no=user[i].u_ofile[j];
			inode=sys_ofile[sys_no].f_inode;
			iput(inode);
			sys_ofile[sys_no].f_count--;
			user[i].u_ofile[j]=SYSOPENFILE+1;
		}
	}

	return 1;

}