On Mon, 2016-04-04 at 16:40 -0700, Andrew Morton wrote:
> On Mon, 4 Apr 2016 16:30:05 +0300 Andy Shevchenko wrote:
>
> >
> > There are new helpers in this patch:
> >
> > uuid_is_valid checks if a UUID is valid
> > uuid_be_to_bin converts from string to binary (big endian)
> > uuid_le_to_bin converts from string to binary (little endian)
> >
> >
> > They will be used in future, i.e. in the following patches in the series.
> >
> > This also moves indices arrays to lib/uuid.c to be shared accross modules.
> >
> > ...
> >
> > --- a/include/linux/uuid.h
> > +++ b/include/linux/uuid.h
> Nit:
>
> >
> > +/**
> > + * uuid_is_valid - checks if UUID string valid
> > + * @uuid: UUID string to check
> > + *
> > + * Description:
> > + * It checks if the UUID string is following the format:
> > + * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
> > + * where x is a hex digit.
> > + *
> > + * Return: 0 on success, %-EINVAL otherwise.
> > + */
> > +int uuid_is_valid(const char *uuid)
> > +{
> > + unsigned int i;
> > +
> > + if (strnlen(uuid, UUID_STRING_LEN) < UUID_STRING_LEN)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < UUID_STRING_LEN; i++) {
> > + if (i == 8 || i == 13 || i == 18 || i == 23) {
> > + if (uuid[i] != '-')
> > + return -EINVAL;
> > + } else if (!isxdigit(uuid[i])) {
> > + return -EINVAL;
> > + }
> > + }
> Could add
>
> if (uuid[i])
> return -EINVAL;
>
> here and lose the additional pass across the input (strlen).
nit2:
Could make this return bool.
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