fix(esp_ringbuf): Fixed no split buffer in case of wrap around with dummy data (IDFGH-14146)

[upolc-lg]

Description

Fixed no split buffer in case of wrap around with dummy data. This is a corner case of the issue #14568.

I added an additional check and exit condition to prvGetItemDefault. The reason for this is to avoid moving the read pointer in prvCheckItemAvail.

Related

Fixes #14568

Testing

A new unit test was added to cover this scenario (test_ringbuf_common.c: TEST_CASE("Test no-split buffers always receive items in order (with dummy)", "[esp_ringbuf][linux]").

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[sudeep-mohanty]

Hi @upolc-lg,
Thank you for providing the fix. However, I debugged the issue further and it turns out that the problem lies in the prvSendItemDoneNoSplit() function. I do not see a need for an additional check in prvCheckItemAvail() or the functions dealing with allow-split buffers which do not support acquiring space on a buffer before writing to it.

So, we would not merge this fix and instead create a new one which fixes your problem. Thanks.