Quoting Andrew Morton (2014-01-30 13:22:51)
> On Thu, 30 Jan 2014 13:11:57 -0800 Sebastian Capella <sebastian.capella@xxxxxxxxxx> wrote:
> > +char *kstrimdup(const char *s, gfp_t gfp)
> > +{
> > + char *buf;
> > + char *begin = skip_spaces(s);
> > + size_t len = strlen(begin);
> > +
> > + while (len > 1 && isspace(begin[len - 1]))
> > + len--;
>
> That's off-by-one isn't it? kstrimdup(" ") should return "", not " ".
>
> > + buf = kmalloc_track_caller(len + 1, gfp);
> > + if (!buf)
> > + return NULL;
> > +
> > + memcpy(buf, begin, len);
> > + buf[len] = '\0';
> > +
> > + return buf;
> > +}
Hi Andrew,
I think this is a little tricky.
For an empty string, the function relies on skip_spaces to point begin
at the \0'.
Alternately, if we don't have an empty string, we know we have at least 1
non-space, non-null character at begin[0], and there's no need to check it,
so the loop stops at [1]. If there's a space at 1, we just put the '\0'
there.
We could check at [0], but I think its already been checked by skip_spaces.
I'll add a comment above the while for that
Thanks,
Sebastian
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