STINNER Victor <[email protected]> added the comment:
Extract of _Py_DecodeUTF8Ex() code, there is an explicit "write a surrogate
pair" comment:
#if SIZEOF_WCHAR_T == 4
ch = ucs4lib_utf8_decode(&s, e, (Py_UCS4 *)unicode, &outpos);
#else
ch = ucs2lib_utf8_decode(&s, e, (Py_UCS2 *)unicode, &outpos);
#endif
if (ch > 0xFF) {
#if SIZEOF_WCHAR_T == 4
Py_UNREACHABLE();
#else
assert(ch > 0xFFFF && ch <= MAX_UNICODE);
/* write a surrogate pair */
unicode[outpos++] = (wchar_t)Py_UNICODE_HIGH_SURROGATE(ch);
unicode[outpos++] = (wchar_t)Py_UNICODE_LOW_SURROGATE(ch);
#endif
}
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Python tracker <[email protected]>
<https://bugs.python.org/issue33928>
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