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Add a warning message about PyOS_snprintf (GH-95993)

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(cherry picked from commit c7b2204996)

Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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Miss Islington (bot) 2022-10-07 13:26:46 -07:00 • committed by GitHub
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Doc/c-api/conversion.rst
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@ -28,7 +28,8 @@ not.
The wrappers ensure that ``str[size-1]`` is always ``'\0'`` upon return. They
never write more than *size* bytes (including the trailing ``'\0'``) into str.
Both functions require that ``str != NULL``, ``size > 0``, ``format != NULL``
and ``size < INT_MAX``.
and ``size < INT_MAX``. Note that this means there is no equivalent to the C99
``n = snprintf(NULL, 0, ...)`` which would determine the necessary buffer size.
The return value (*rv*) for these functions should be interpreted as follows: