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gh-119182: Decode PyUnicode_FromFormat() format string from UTF-8 #120248

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gh-119182: Decode PyUnicode_FromFormat() format string from UTF-8 #120248

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3d5bca4
gh-119182: Decode PyUnicode_FromFormat() format from UTF-8
vstinner Jun 7, 2024
6a87915
Update test_exceptions
vstinner Jun 7, 2024
e830944
Use strict error handler
vstinner Jun 11, 2024
242e6cb
Fix error handling
vstinner Jun 11, 2024
d04269f
Add tests on truncated UTF-8 format strings
vstinner Jun 11, 2024
94da5e7
Don't mention the strict error handler
vstinner Jun 11, 2024
89fd69a
Revert consumed parameter
vstinner Jun 11, 2024
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Fix error handling 
Replace PyErr_Format() with PyErr_SetString()
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@vstinner
vstinner committed Jun 11, 2024
commit 242e6cb583e384ca67cf417ade13ead6c6927032
2 changes: 1 addition & 1 deletion Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2907,7 +2907,7 @@ PyUnicode_FromFormatV(const char *format, va_list vargs)
if (unicode_decode_utf8_writer(&writer, f, len,
_Py_ERROR_STRICT, "strict") < 0) {
PyObject *exc = PyErr_GetRaisedException();
PyErr_Format(PyExc_ValueError,
PyErr_SetString(PyExc_ValueError,
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@serhiy-storchaka serhiy-storchaka Jun 11, 2024

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Why raise ValueError explicitly? If you want a ValueError for compatibility, UnicodeDecode is a subclass of ValueError, so this is a backward compatible change. Other functions which take const char * do not raise ValueError explicitly.

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@vstinner vstinner Jun 11, 2024

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The error message helps debugging such issue: it points directly to the format string.

"PyUnicode_FromFormatV() expects a valid UTF-8-encoded "
"format string, got an invalid UTF-8 string");
_PyErr_ChainExceptions1(exc);
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