int main(int argc, char *argv[])
{
// 局部变量
char buf[SECSIZE];
// FAT表表头标记
uchar fatStartContent[8] = {0xf8,0xff,0xff,0x0f,0xff,0xff,0xff,0xff};
struct direntry dire;
uint dirClusNum; // 为文件分配的簇号
uint wClusNum; // 根目录簇号
uint fileSize; // 文件大小
uint cc, fd; // cc一次读取文件的字节数，打开文件的fd
int rootWSize = 0; // 已向根目录写入的字节数
int fileWSize = 0; // 已向文件中写入的字节数
char filename[FNSIZE]; // 文件名
int i;
static_assert(sizeof(int) == 4, "Integers must be 4 bytes!");
if(argc < 2){
fprintf(stderr, "Usage: mkfs fs.img files...\n");
exit(1);
}
initDat();
// 是否有需要断言
// ?
fsfd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666);
if(fsfd < 0){
perror(argv[1]);
exit(1);
}
printf("DBR : %d, retain sectors: %d, FAT sector: %d, 2 FATs, data sectors: %d, clusters: %d",
nDBR, nRetain, nFAT, nData, nDataClus);
// 清零fs
for(i = 0; i < FSSIZE; i++)
szero(i);
// 向第0扇区写入DBR
initDBR();
memset(buf, 0, sizeof(buf));
memmove(buf, &fatDBR, sizeof(fatDBR));
wsect(0, buf);
// 写入FAT表头标记
rsect4bytes(fatFstSec, 0, fatStartContent);
rsect4bytes(fatFstSec, 1, fatStartContent + 4);
// 写入根目录
dire = mkFCB(T_DIR, "/", sizeof(DIR)*argc, &dirClusNum);
dirClusNum = appendBuf(dirClusNum, &dire, sizeof(DIR), rootWSize);
rootWSize += sizeof(DIR);
wClusNum = dirClusNum;
dire = mkFCB(T_DIR, ".", sizeof(DIR)*argc, &dirClusNum);
wClusNum = appendBuf(wClusNum, &dire, sizeof(DIR), rootWSize);
rootWSize += sizeof(DIR);
dire = mkFCB(T_DIR, "..", 0, &dirClusNum);
wClusNum = appendBuf(wClusNum, &dire, sizeof(DIR), rootWSize);
rootWSize += sizeof(DIR);
// 写入其他文件
for(i = 2; i < argc; i++){
fileWSize = 0;
assert(index(argv[i], '/') == 0);
fileSize = retFileSize(argv[i]);
if((fd = open(argv[i], 0)) < 0){
perror(argv[i]);
exit(1);
}
if(argv[i][0] == '_')
++argv[i];
// 写到目录区
strncpy(filename, argv[i], FNSIZE);
dire = mkFCB(T_FILE, filename, fileSize, &dirClusNum);
wClusNum = appendBuf(wClusNum, &dire, sizeof(DIR), rootWSize);
rootWSize += sizeof(DIR);
// 写入文件
while((cc = read(fd, buf, sizeof(buf))) > 0)
{
dirClusNum = appendBuf(dirClusNum, buf, cc, fileWSize);
fileWSize += cc;
}
close(fd);
}
// 向第1扇区写入FSI
initFSI();
memset(buf, 0, sizeof(buf));
memmove(buf, &fsi, sizeof(fsi));
wsect(1, buf);
// 向备份FAT中写入相同的内容
for(i = fatFstSec; i < fatFstSec + nFAT; i++) {
rsect(i, buf);
wsect((i+nFAT), buf);
}
// // fix size of root inode dir
// rinode(rootino, &din);
// off = xint(din.size);
// off = ((off/BSIZE) + 1) * BSIZE;
// din.size = xint(off);
// winode(rootino, &din);
// balloc(freeblock);
exit(0);
}
void appendStruct(const T& s) {
appendBuf(&s, sizeof(T));
}