searchmap.c

来自「操作系统简单的登入程序」· C语言 代码 · 共 108 行

#include <stdio.h>
#include <string.h>
#include "filesys.h"
unsigned short freedir2id()
{
	unsigned short i;

	for (i=0;i<DIRNUM;i++)
	{
		if(directory_2.direct[i].filetype==DIEMPTY)
		{
			break;
		}
	}
	return i;
}

unsigned short freedir1id()
{
	unsigned short i;

	for (i=0;i<USERNUM;i++)
	{
		if(directory_1.users[i].n_inode==0)
		{
			break;
		}
	}
	return i;
}

/*
Search the fist level directory item to find the second level directory item
input: first level directory item name
return: mapping second level directory
*/
unsigned short  map2dir(char* name)
{
	int i;

	for (i=0;i<DIRNUM;i++)
	{
		if(!strcmp(directory_1.users[i].u_uid,name))
		{
			break;
		}
	}
	if (i!=DIRNUM )
		return i;
	else
		return MAPERR;
}
/*
Search the second level directory item to find the inode item in the inode table
input:second level directory item name;
return: mapping inode
*/
unsigned short map2inode(char* name)
{
	int i;
	for (i=0;i<DIRNUM;i++)
	{
		if(!strcmp(directory_2.direct[i].name,name))
		{
		//printf("\nmap is %s in the %d\n",directory_2.direct[i].name,i);
		
			break;
		}
	}
	if(i!=DIRNUM)

		return 	directory_2.direct[i].d_ino;
	else
		return MAPERR;

}

unsigned short dirname2id(char* name)
{
	unsigned short i;

	for (i=0;i<DIRNUM;i++)
	{
		if(!strcmp(directory_2.direct[i].name,name))
		{
			break;
		}
	}
	return i;
}

unsigned short username2id(char* name)
{
	unsigned short i;

	for (i=0;i<USERNUM;i++)
	{
		printf("users[%d].u_uid: %s\n", i, directory_1.users[i].u_uid);
		if(!strcmp(directory_1.users[i].u_uid,name))
		{
			break;
		}
	}
	return i;
}