Stefan Krah added the comment:
buf[1] contains NUL if SIZE_OF_WCHAR_T is 4.
The man page says:
size_t wcstombs(char *dest, const wchar_t *src, size_t n)
The conversion can stop for three reasons:
3. The wide-character string has been completely converted, including the
terminating L'\0'. In
this case the conversion ends in the initial state. The number of bytes
written to dest, exclud-
ing the terminating '\0' byte, is returned.
To me this sounds like there cannot be an invalid write.
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nosy: +skrah
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<http://bugs.python.org/issue15930>
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