Re: [PATCH] driver core: Add the ability to unbind drivers to devices from userspace

[Jon Smirl]

Any comments on this? I'll fix up the whitespace issues if everyone
agrees that the code works.

This patch will break all of the fbdev attributes since I was making
wrong assumptions. I have another patch ready to fix them after this
one goes in.

On 7/25/05, Jon Smirl <jonsmirl@xxxxxxxxx> wrote:
> On 7/25/05, Greg KH <greg@xxxxxxxxx> wrote:
> > > I'll put one together to trim leading/trailing white space from the
> > > buffer before it is passed into the attribute functions. Now that I
> > > think about this I believe the attributes should have always had the
> > > leading/trailing white space removed. If we don't do it in the sysfs
> > > code then every driver has to do it.
> >
> > Ok, sounds good.
> 
> How does this look? This is a count based interface but a lot of
> attributes don't work unless I add the terminating zero. This
> interface should be documented: count or zero terminated, white space
> stripped or not, etc. Are these strings ASCII, UTF8, Unicode?
> 
> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> --- a/fs/sysfs/file.c
> +++ b/fs/sysfs/file.c
> @@ -6,6 +6,7 @@
>  #include <linux/fsnotify.h>
>   #include <linux/kobject.h>
>  #include <linux/namei.h>
> +#include <linux/ctype.h>
>  #include <asm/uaccess.h>
>  #include <asm/semaphore.h>
> 
> @@ -207,6 +208,28 @@ flush_write_buffer(struct dentry * dentr
>         struct attribute * attr = to_attr(dentry);
>         struct kobject * kobj = to_kobj(dentry->d_parent);
>         struct sysfs_ops * ops = buffer->ops;
> +       char *x, *y, *z;
> +
> +       /* locate leading white space */
> +       x = buffer->page;
> +       while( isspace(*x) && (x - buffer->page < count))
> +               x++;
> +
> +       /* locate trailng white space */
> +       z = y = x;
> +       while (y - buffer->page < count) {
> +               y++;
> +               z = y;
> +               while( isspace(*y) && (y - buffer->page < count)) {
> +                       y++;
> +               }
> +       }
> +       count = z - x;
> +
> +       /* strip the white space */
> +       if (buffer->page != x)
> +               memmove(buffer->page, x, count);
> +       buffer->page[count] = '\0';
> 
>         return ops->store(kobj,attr,buffer->page,count);
>  }
> 
> 
> --
> Jon Smirl
> jonsmirl@xxxxxxxxx
> 


-- 
Jon Smirl
jonsmirl@xxxxxxxxx
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