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gh-125196: Use PyUnicodeWriter in symtable.c #125199

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merged 1 commit into from
Oct 9, 2024
Merged

gh-125196: Use PyUnicodeWriter in symtable.c #125199

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35 changes: 16 additions & 19 deletions Python/symtable.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3120,33 +3120,30 @@ _Py_Mangle(PyObject *privateobj, PyObject *ident)
if (ipriv == plen) {
return Py_NewRef(ident); /* Don't mangle if class is just underscores */
}
plen -= ipriv;

if (plen + nlen >= PY_SSIZE_T_MAX - 1) {
if (nlen + (plen - ipriv) >= PY_SSIZE_T_MAX - 1) {
PyErr_SetString(PyExc_OverflowError,
"private identifier too large to be mangled");
return NULL;
}

Py_UCS4 maxchar = PyUnicode_MAX_CHAR_VALUE(ident);
if (PyUnicode_MAX_CHAR_VALUE(privateobj) > maxchar) {
maxchar = PyUnicode_MAX_CHAR_VALUE(privateobj);
}

PyObject *result = PyUnicode_New(1 + nlen + plen, maxchar);
if (!result) {
PyUnicodeWriter *writer = PyUnicodeWriter_Create(1 + nlen + (plen - ipriv));
if (!writer) {
return NULL;
}
/* ident = "_" + priv[ipriv:] + ident # i.e. 1+plen+nlen bytes */
PyUnicode_WRITE(PyUnicode_KIND(result), PyUnicode_DATA(result), 0, '_');
if (PyUnicode_CopyCharacters(result, 1, privateobj, ipriv, plen) < 0) {
Py_DECREF(result);
return NULL;
// ident = "_" + priv[ipriv:] + ident
if (PyUnicodeWriter_WriteChar(writer, '_') < 0) {
goto error;
}
if (PyUnicode_CopyCharacters(result, plen+1, ident, 0, nlen) < 0) {
Py_DECREF(result);
return NULL;
if (PyUnicodeWriter_WriteSubstring(writer, privateobj, ipriv, plen) < 0) {
goto error;
}
assert(_PyUnicode_CheckConsistency(result, 1));
return result;
if (PyUnicodeWriter_WriteStr(writer, ident) < 0) {
goto error;
}
return PyUnicodeWriter_Finish(writer);

error:
PyUnicodeWriter_Discard(writer);
return NULL;
}
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