[PATCH] rtems-fdt / shell - Fix string truncation warning

Sebastian Huber sebastian.huber at embedded-brains.de
Thu Oct 15 17:24:03 UTC 2020

On 15/10/2020 15:06, Frank Kühndel wrote:

> On 10/15/20 2:09 PM, Sebastian Huber wrote:
>>> From: Frank Kühndel<frank.kuehndel at embedded-brains.de>
>>> The compiler warning was:
>>> ../../../cpukit/libmisc/rtems-fdt/rtems-fdt.c:267:5: warning:
>>> 'strncpy' specified bound depends on the length of the source argument
>>>     267 |     strncpy(path, name, namelen);
>>>         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> It turns out that the `strncpy()` nor the buffer `path` is needed when
>>> one uses `strncmp()` instead of `strcmp()`. This needs some change to
>>> the algorithm but has the advantage that `name` is never truncated
>>> to the size of the buffer `path`.
>> Does it help to use bsearch() to simplify this code further?
> Nice! I did not even know (or remember about) bsearch().
> No, it wont help. bsearch() works on "similar" objects (e.g. two
> strings). The function I modified searches a string in an array of
> 'rtems_fdt_index_entry' objects. To make that work, one must create a
> dummy 'rtems_fdt_index_entry' containing that string.
> Moreover, there remains the problem that the 'name' string has an
> artificially restricted length which must be convoyed to the 'compar()'
> function used by 'bseach()'.
> Finally, rtems-fdt.c is - most likely - dead code. So, I would end up
> spending my time on brushing up dead code.

Ok, thanks for having a look at this. I checked in the patch as is.

This was the last warning in the architecture-independent part (except 
the old network stack).

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