[FFmpeg-cvslog] avutil/common: warn about possible move of the data pointer after the last 0 byte in GET_UTF8

[Marton Balint]

ffmpeg | branch: master | Marton Balint <cus at passwd.hu> | Wed Jan 29 23:56:07 2020 +0100| [6026384047ab8e895d416aab4e2531bd87c0c01d] | committer: Marton Balint

avutil/common: warn about possible move of the data pointer after the last 0 byte in GET_UTF8

Signed-off-by: Marton Balint <cus at passwd.hu>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6026384047ab8e895d416aab4e2531bd87c0c01d
---

 libavutil/common.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavutil/common.h b/libavutil/common.h
index e6f076a13c..142ff9abe7 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -373,7 +373,9 @@ static av_always_inline av_const int av_parity_c(uint32_t v)
  * @param GET_BYTE Expression reading one byte from the input.
  *                 Evaluated up to 7 times (4 for the currently
  *                 assigned Unicode range).  With a memory buffer
- *                 input, this could be *ptr++.
+ *                 input, this could be *ptr++, or if you want to make sure
+ *                 that *ptr stops at the end of a NULL terminated string then
+ *                 *ptr ? *ptr++ : 0
  * @param ERROR    Expression to be evaluated on invalid input,
  *                 typically a goto statement.
  *