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SubjectRe: [RFC][PATCH] Apple SMC driver (hardware monitoring and control)
2007/3/14, Cong WANG wrote:
> I am sorry. I forgot to CC to the list.
>
> 2007/3/14, Nicolas Boichat wrote:
> > Hello,
> >
>
> <snip>
>
> > +static ssize_t applesmc_show_fan_manual(struct device *dev, char *buf,
> > + int offset)
> > +{
> > + int ret;
> > + u16 manual = 0;
> > + u8 buffer[2];
> > +
> > + down(&applesmc_sem);
> > +
> > + ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
> > + manual = ((buffer[0] << 8 | buffer[1]) >> offset) & 0x01;
> > +
> > + up(&applesmc_sem);
> > + if (ret)
> > + return ret;
> > + else
> > + return sprintf(buf, "%d\n", manual);
> > +}
> > +
>
> I doubt about your last 'sprintf'. Your 'buf' just has only two 'u8's,
> which maybe only has two bytes, and '\n' already consumes one. So only
> one byte is left for the decimal vaule of 'manual'. Even it is just
> less than 10, just as what you want, the final '\0' is omitted!
>
> What's more, you can't get such information from the return value of
> 'sprintf'. So I suggest you to choose 'snprintf' instead.
>

Sorry. I thought his 'buffer' as 'buf'. But my suggestion is still
worthy your thinking.
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