Re: [Qemu-devel] [5532] Replace uses of strndup (a GNU extension) with Qemu pstrdup

["Blue Swirl" <blauwirbel@gmail.com>]

On 10/25/08, andrzej zaborowski <balrogg@gmail.com> wrote:
> 2008/10/25 Blue Swirl <blauwirbel@gmail.com>:
>
> > Revision: 5532
>  >          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5532
>  > Author:   blueswir1
>  > Date:     2008-10-25 11:23:27 +0000 (Sat, 25 Oct 2008)
>  >
>  > Log Message:
>  > -----------
>  > Replace uses of strndup (a GNU extension) with Qemu pstrdup
>  >
>  > Modified Paths:
>  > --------------
>  >    trunk/cutils.c
>  >    trunk/hw/bt-hci.c
>  >    trunk/qemu-common.h
>  >
>  > Modified: trunk/cutils.c
>  > ===================================================================
>  > --- trunk/cutils.c      2008-10-25 11:21:28 UTC (rev 5531)
>  > +++ trunk/cutils.c      2008-10-25 11:23:27 UTC (rev 5532)
>  > @@ -50,6 +50,18 @@
>  >     return buf;
>  >  }
>  >
>  > +/* strdup with a limit */
>  > +char *pstrdup(const char *str, size_t buf_size)
>  > +{
>  > +    size_t len;
>  > +    char *buf;
>  > +
>  > +    len = MIN(buf_size, strlen(str));
>  > +    buf = qemu_malloc(len);
>  > +    pstrcpy(buf, len, str);
>  > +    return buf;
>  > +}
>
>
> I think here also pstrcpy will only copy up to buf_size - 1 characters
>  while strndup would copy buf_size chars.

That is actually safer if we always want the strings to be NUL terminated.

But the allocation length is wrong, it should be MIN(buf_size, strlen(str) + 1).