yaffsfs.c

yaffs2 lastest sourcecode~~

	{
		pos=  h->position;
		if(yaffs_GetObjectFileLength(obj) > pos)
		{
			maxRead = yaffs_GetObjectFileLength(obj) - pos;
		}
		else
		{
			maxRead = 0;
		}

		if(nbyte > maxRead)
		{
			nbyte = maxRead;
		}


		if(nbyte > 0)
		{
			nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
			if(nRead >= 0)
			{
				h->position = pos + nRead;
			}
			else
			{
				//todo error
			}
		}
		else
		{
			nRead = 0;
		}

	}

	yaffsfs_Unlock();


	return (nRead >= 0) ? nRead : -1;

}

int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
{
	yaffsfs_Handle *h = NULL;
	yaffs_Object *obj = NULL;
	int pos = 0;
	int nRead = -1;
	unsigned int maxRead;

	yaffsfs_Lock();
	h = yaffsfs_GetHandlePointer(fd);
	obj = yaffsfs_GetHandleObject(fd);

	if(!h || !obj)
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}
	else if( h && obj)
	{
		pos= offset;
		if(yaffs_GetObjectFileLength(obj) > pos)
		{
			maxRead = yaffs_GetObjectFileLength(obj) - pos;
		}
		else
		{
			maxRead = 0;
		}

		if(nbyte > maxRead)
		{
			nbyte = maxRead;
		}


		if(nbyte > 0)
		{
			nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
		}
		else
		{
			nRead = 0;
		}

	}

	yaffsfs_Unlock();


	return (nRead >= 0) ? nRead : -1;

}

int yaffs_write(int fd, const void *buf, unsigned int nbyte)
{
	yaffsfs_Handle *h = NULL;
	yaffs_Object *obj = NULL;
	int pos = 0;
	int nWritten = -1;
	int writeThrough = 0;

	yaffsfs_Lock();
	h = yaffsfs_GetHandlePointer(fd);
	obj = yaffsfs_GetHandleObject(fd);

	if(!h || !obj)
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}
	else if( h && obj && h->readOnly)
	{
		// todo error
	}
	else if( h && obj)
	{
		if(h->append)
		{
			pos =  yaffs_GetObjectFileLength(obj);
		}
		else
		{
			pos = h->position;
		}

		nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);

		if(nWritten >= 0)
		{
			h->position = pos + nWritten;
		}
		else
		{
			//todo error
		}

	}

	yaffsfs_Unlock();


	return (nWritten >= 0) ? nWritten : -1;

}

int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
{
	yaffsfs_Handle *h = NULL;
	yaffs_Object *obj = NULL;
	int pos = 0;
	int nWritten = -1;
	int writeThrough = 0;

	yaffsfs_Lock();
	h = yaffsfs_GetHandlePointer(fd);
	obj = yaffsfs_GetHandleObject(fd);

	if(!h || !obj)
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}
	else if( h && obj && h->readOnly)
	{
		// todo error
	}
	else if( h && obj)
	{
		pos = offset;

                nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);

                if(nWritten < 0 || ((unsigned int)nWritten) < nbyte)
                        yaffsfs_SetError(-ENOSPC);

        }

	yaffsfs_Unlock();


	return (nWritten >= 0) ? nWritten : -1;

}


int yaffs_truncate(const YCHAR *path,off_t newSize)
{
	yaffs_Object *obj = NULL;
	int result = YAFFS_FAIL;

	yaffsfs_Lock();

	obj = yaffsfs_FindObject(NULL,path,0);
	if(obj)
		obj = yaffs_GetEquivalentObject(obj);

	if(!obj)
	{
		yaffsfs_SetError(-ENOENT);
	}
	else if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
	{
		yaffsfs_SetError(-EISDIR);
	}
	else
	{
		result = yaffs_ResizeFile(obj,newSize);
	}

	yaffsfs_Unlock();


	return (result) ? 0 : -1;
}

int yaffs_ftruncate(int fd, off_t newSize)
{
	yaffsfs_Handle *h = NULL;
	yaffs_Object *obj = NULL;
	int result = 0;

	yaffsfs_Lock();
	h = yaffsfs_GetHandlePointer(fd);
	obj = yaffsfs_GetHandleObject(fd);

	if(!h || !obj)
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}
	else
	{
		// resize the file
		result = yaffs_ResizeFile(obj,newSize);
	}
	yaffsfs_Unlock();


	return (result) ? 0 : -1;

}

off_t yaffs_lseek(int fd, off_t offset, int whence)
{
	yaffsfs_Handle *h = NULL;
	yaffs_Object *obj = NULL;
	int pos = -1;
	int fSize = -1;

	yaffsfs_Lock();
	h = yaffsfs_GetHandlePointer(fd);
	obj = yaffsfs_GetHandleObject(fd);

	if(!h || !obj)
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}
	else if(whence == SEEK_SET)
	{
		if(offset >= 0)
		{
			pos = offset;
		}
	}
	else if(whence == SEEK_CUR)
	{
		if( (h->position + offset) >= 0)
		{
			pos = (h->position + offset);
		}
	}
	else if(whence == SEEK_END)
	{
		fSize = yaffs_GetObjectFileLength(obj);
		if(fSize >= 0 && (fSize + offset) >= 0)
		{
			pos = fSize + offset;
		}
	}

	if(pos >= 0)
	{
		h->position = pos;
	}
	else
	{
		// todo error
	}


	yaffsfs_Unlock();

	return pos;
}


int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
{
	yaffs_Object *dir = NULL;
	yaffs_Object *obj = NULL;
	YCHAR *name;
	int result = YAFFS_FAIL;

	yaffsfs_Lock();

	obj = yaffsfs_FindObject(NULL,path,0);
	dir = yaffsfs_FindDirectory(NULL,path,&name,0);
	if(!dir)
	{
		yaffsfs_SetError(-ENOTDIR);
	}
	else if(!obj)
	{
		yaffsfs_SetError(-ENOENT);
	}
	else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
	{
		yaffsfs_SetError(-EISDIR);
	}
	else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
	{
		yaffsfs_SetError(-ENOTDIR);
	}
	else
	{
		result = yaffs_Unlink(dir,name);

		if(result == YAFFS_FAIL && isDirectory)
		{
			yaffsfs_SetError(-ENOTEMPTY);
		}
	}

	yaffsfs_Unlock();

	// todo error

	return (result == YAFFS_FAIL) ? -1 : 0;
}


int yaffs_rmdir(const YCHAR *path)
{
	return yaffsfs_DoUnlink(path,1);
}

int yaffs_unlink(const YCHAR *path)
{
	return yaffsfs_DoUnlink(path,0);
}

int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
{
	yaffs_Object *olddir = NULL;
	yaffs_Object *newdir = NULL;
	yaffs_Object *obj = NULL;
	YCHAR *oldname;
	YCHAR *newname;
	int result= YAFFS_FAIL;
	int renameAllowed = 1;

	yaffsfs_Lock();

	olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
	newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
	obj = yaffsfs_FindObject(NULL,oldPath,0);

	if(!olddir || !newdir || !obj)
	{
		// bad file
		yaffsfs_SetError(-EBADF);
		renameAllowed = 0;
	}
	else if(olddir->myDev != newdir->myDev)
	{
		// oops must be on same device
		// todo error
		yaffsfs_SetError(-EXDEV);
		renameAllowed = 0;
	}
	else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
	{
		// It is a directory, check that it is not being renamed to
		// being its own decendent.
		// Do this by tracing from the new directory back to the root, checking for obj

		yaffs_Object *xx = newdir;

		while( renameAllowed && xx)
		{
			if(xx == obj)
			{
				renameAllowed = 0;
			}
			xx = xx->parent;
		}
		if(!renameAllowed) yaffsfs_SetError(-EACCES);
	}

	if(renameAllowed)
	{
		result = yaffs_RenameObject(olddir,oldname,newdir,newname);
	}

	yaffsfs_Unlock();

	return (result == YAFFS_FAIL) ? -1 : 0;
}


static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
{
	int retVal = -1;

	if(obj)
	{
		obj = yaffs_GetEquivalentObject(obj);
	}

	if(obj && buf)
	{
    	buf->st_dev = (int)obj->myDev->genericDevice;
    	buf->st_ino = obj->objectId;
    	buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits

		if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
		{
			buf->st_mode |= S_IFDIR;
		}
		else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
		{
			buf->st_mode |= S_IFLNK;
		}
		else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
		{
			buf->st_mode |= S_IFREG;
		}

    	buf->st_nlink = yaffs_GetObjectLinkCount(obj);
    	buf->st_uid = 0;
    	buf->st_gid = 0;;
    	buf->st_rdev = obj->yst_rdev;
    	buf->st_size = yaffs_GetObjectFileLength(obj);
		buf->st_blksize = obj->myDev->nDataBytesPerChunk;
    	buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
#if CONFIG_YAFFS_WINCE
		buf->yst_wince_atime[0] = obj->win_atime[0];
		buf->yst_wince_atime[1] = obj->win_atime[1];
		buf->yst_wince_ctime[0] = obj->win_ctime[0];
		buf->yst_wince_ctime[1] = obj->win_ctime[1];
		buf->yst_wince_mtime[0] = obj->win_mtime[0];
		buf->yst_wince_mtime[1] = obj->win_mtime[1];
#else
    	buf->yst_atime = obj->yst_atime;
    	buf->yst_ctime = obj->yst_ctime;
    	buf->yst_mtime = obj->yst_mtime;
#endif
		retVal = 0;
	}
	return retVal;
}

static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
{
	yaffs_Object *obj;

	int retVal = -1;

	yaffsfs_Lock();
	obj = yaffsfs_FindObject(NULL,path,0);

	if(!doLStat && obj)
	{
		obj = yaffsfs_FollowLink(obj,0);
	}

	if(obj)
	{
		retVal = yaffsfs_DoStat(obj,buf);
	}
	else
	{
		// todo error not found
		yaffsfs_SetError(-ENOENT);
	}

	yaffsfs_Unlock();

	return retVal;

}

int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
{
	return yaffsfs_DoStatOrLStat(path,buf,0);
}

int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
{
	return yaffsfs_DoStatOrLStat(path,buf,1);
}

int yaffs_fstat(int fd, struct yaffs_stat *buf)
{
	yaffs_Object *obj;

	int retVal = -1;

	yaffsfs_Lock();
	obj = yaffsfs_GetHandleObject(fd);

	if(obj)
	{
		retVal = yaffsfs_DoStat(obj,buf);
	}
	else
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}

	yaffsfs_Unlock();

	return retVal;
}

#ifdef CONFIG_YAFFS_WINCE
int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
{
	yaffs_Object *obj;

	int retVal = -1;

	yaffsfs_Lock();
	obj = yaffsfs_GetHandleObject(fd);

	if(obj)
	{

		if(wctime){
			wctime[0] = obj->win_ctime[0];
			wctime[1] = obj->win_ctime[1];
		}
		if(watime){
			watime[0] = obj->win_atime[0];
			watime[1] = obj->win_atime[1];
		}
		if(wmtime){
			wmtime[0] = obj->win_mtime[0];
			wmtime[1] = obj->win_mtime[1];
		}


		retVal = 0;
	}
	else
	{
		// bad handle
		yaffsfs_SetError(-EBADF);		
	}
	
	yaffsfs_Unlock();
	
	return retVal;
}


int yaffs_set_wince_times(int fd, 
						  const unsigned *wctime, 
						  const unsigned *watime, 
                                                  const unsigned *wmtime)
{
        yaffs_Object *obj;
        int result;
        int retVal = -1;

        yaffsfs_Lock();
	obj = yaffsfs_GetHandleObject(fd);

	if(obj)
	{

		if(wctime){
			obj->win_ctime[0] = wctime[0];
			obj->win_ctime[1] = wctime[1];
		}
		if(watime){
                        obj->win_atime[0] = watime[0];
                        obj->win_atime[1] = watime[1];
                }
                if(wmtime){
                        obj->win_mtime[0] = wmtime[0];
                        obj->win_mtime[1] = wmtime[1];
                }

                obj->dirty = 1;
                result = yaffs_FlushFile(obj,0);
                retVal = 0;
        }
        else
	{
		// bad handle
		yaffsfs_SetError(-EBADF);
	}

	yaffsfs_Unlock();

	return retVal;
}

#endif


static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
{
	int result = -1;

	if(obj)
	{
		obj = yaffs_GetEquivalentObject(obj);
	}

	if(obj)
	{
		obj->yst_mode = mode;
		obj->dirty = 1;
		result = yaffs_FlushFile(obj,0);
	}

	return result == YAFFS_OK ? 0 : -1;
}


int yaffs_access(const YCHAR *path, int amode)
{
	yaffs_Object *obj;

	int retval = 0;

	yaffsfs_Lock();
	obj = yaffsfs_FindObject(NULL,path,0);

	if(obj)
	{
		int access_ok = 1;

		if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
			access_ok = 0;
		if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
			access_ok = 0;
		if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
			access_ok = 0;

		if(!access_ok) {
			yaffsfs_SetError(-EACCES);
			retval = -1;
		}
	}
	else
	{
		// todo error not found
		yaffsfs_SetError(-ENOENT);
		retval = -1;