blockwr.c

来自「操作系统简单的登入程序」· C语言 代码 · 共 56 行

#include <stdio.h>
#include "filesys.h"
void blockwrite(char* txt,struct inode* inodei );
char* blockread(struct inode* inodei );

void blockwrite(char* txt,struct inode* inodei )
{
	int i,count;
	
	char flag='1';
	
	char buff[BLOCKSIZE];

	count=strlen(txt);

	fd=fopen("filesystem","r+");


	for(i=0;i<inodei->di_size;i++)
	{

		strncpy(buff,txt+i*(BLOCKSIZE),BLOCKSIZE);


		fseek(fd,BLOCKSIZE*(inodei->di_addr[i]),SEEK_SET);

		fwrite(buff,sizeof(char),BLOCKSIZE,fd);

	}
	fclose(fd);
}

char* blockread(struct inode* inodei )
{
	char* txt;
	
	int i;
	
	char buff[BLOCKSIZE];
	
	txt=(char*)malloc(sizeof(char)*BLOCKSIZE*(inodei->di_size));

	fd=fopen("filesystem","r+");
	
	for(i=0;i<inodei->di_size;i++)
	{
		fseek(fd,BLOCKSIZE*(inodei->di_addr[i]),SEEK_SET);

		fread(txt+i*BLOCKSIZE,sizeof(char),BLOCKSIZE,fd);
	
	}

	fclose(fd);
	return txt;
}