简单文件系统的实现的实验报告(6)

}

return -1;

bknum=fcbptr->first;

fcbtmp2=fcbtmp=(fcb *)(myvhard+bknum*BLOCKSIZE); for(j=0;jlength/sizeof(fcb);j++) { }

while(bknum!=END) { }

strcpy(fcbptr->filename,\ strcpy(fcbptr->exname,\ fcbptr->first=END; openfilelist[curfd].count=0;

do_write(curfd,text,openfilelist[curfd].length,2); } /* 原型声明: 功能描述： 输入：

filename

指向要打开的文件的名字的指针

int my_open(char *filename) 打开文件函数

fatptr=fat1+bknum; bknum=fatptr->id; fatptr->id=FREE;

if(strcmp(fcbtmp2->filename,\{ }

fcbtmp2++;

printf(\return -1;

输出：

返回打开的文件的id

函数功能实现算法描述： */

int my_open(char *filename) {

int i,fd,rbn;

char text[MAX_TXT_SIZE],*p,*fname,*exname; fcb *fcbptr; char exnamed=0;

fname=strtok(filename,\ exname=strtok(NULL,\ if(!exname) { }

for(i=0;i

openfilelist[curfd].count=0;

rbn=do_read(curfd,openfilelist[curfd].length,text); fcbptr=(fcb *)text;

for(i=0;i

if(i>=rbn/sizeof(fcb)) { }

if(exnamed) { }

fd=findFreeO(); if(fd==-1)

free(exname);

printf(\return curfd;

if(strcmp(filename,fcbptr->filename)==0 && strcmp(fcbptr->exname,exname)==0) { } fcbptr++;

break;

if(strcmp(openfilelist[i].filename,filename)==0 &&strcmp(openfilelist[i].exname,exname)==0&& i!=curfd) { }

printf(\return -1;

exname=(char *)malloc(3); strcpy(exname,\exnamed=1;

{ }

strcpy(openfilelist[fd].filename,fcbptr->filename); strcpy(openfilelist[fd].exname,fcbptr->exname); openfilelist[fd].attribute=fcbptr->attribute; openfilelist[fd].count=0;

openfilelist[fd].date=fcbptr->date; openfilelist[fd].first=fcbptr->first; openfilelist[fd].length=fcbptr->length; openfilelist[fd].time=fcbptr->time; openfilelist[fd].father=curfd;

openfilelist[fd].dirno=openfilelist[curfd].first; openfilelist[fd].diroff=i; openfilelist[fd].fcbstate=0; openfilelist[fd].free=1; openfilelist[fd].topenfile=1;

strcpy(openfilelist[fd].dir[fd],openfilelist[curfd].dir[curfd]); p=openfilelist[fd].dir[fd]; while(*p!='\\0')

p++; return -1;

strcpy(p,filename); while(*p!='\\0') p++;

if(openfilelist[fd].attribute&0x20) { } else { }

return fd; } /**/ /* 原型声明: 功能描述： 输入：

fd

打开文件的id

int my_close(int fd) 关闭文件函数

*p='.';p++;

strcpy(p,openfilelist[fd].exname); *p='\\\\';p++; *p='\\0';

输出：

返回fd的father的id

函数功能实现算法描述： */

int my_close(int fd) {

fcb *fafcb;

char text[MAX_TXT_SIZE]; int fa; /*

检查fd的有效性 */

if(fd > MAX_OPEN_FILE || fd<=0) { }

fa=openfilelist[fd].father; if(openfilelist[fd].fcbstate) { }

openfilelist[fd].attribute=0; openfilelist[fd].count=0; openfilelist[fd].date=0; strcpy(openfilelist[fd].dir[fd],\ strcpy(openfilelist[fd].filename,\

openfilelist[fa].count=0;

do_write(fa,text,openfilelist[fa].length,2);

fafcb=(fcb *)(text+sizeof(fcb)*openfilelist[fd].diroff); fafcb->attribute=openfilelist[fd].attribute; fafcb->date=openfilelist[fd].date; fafcb->first=openfilelist[fd].first; fafcb->length=openfilelist[fd].length; fafcb->time=openfilelist[fd].time;

strcpy(fafcb->filename,openfilelist[fd].filename); strcpy(fafcb->exname,openfilelist[fd].exname); fa=openfilelist[fd].father; openfilelist[fa].count=0;

do_read(fa,openfilelist[fa].length,text); printf(\return -1;

strcpy(openfilelist[fd].exname,\ openfilelist[fd].length=0; openfilelist[fd].time=0; openfilelist[fd].free=0; openfilelist[fd].topenfile=0;

return fa; } /**/ /* 原型声明: 功能描述： 输入： dirname 输出：

函数功能实现算法描述： */

void my_cd(char *dirname) {

char *p,text[MAX_TXT_SIZE]; int fd,i;

p=strtok(dirname,\ if(strcmp(p,\

return;

指向目录名的指针 无

void my_cd(char *dirname) 更改当前目录函数

if(strcmp(p,\ { }

if(strcmp(p,\oot\ {

for(i=1;i

ptrcurdir=&openfilelist[0]; curfd=0;

if(openfilelist[i].free)

my_close(i);

fd=openfilelist[curfd].father; my_close(curfd); curfd=fd;

ptrcurdir=&openfilelist[curfd]; return;