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gh-129813, PEP 782: Use PyBytesWriter in bufferedio.c by vstinner · Pull Request #139121 · python/cpython · GitHub

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gh-129813, PEP 782: Use PyBytesWriter in bufferedio.c #139121

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Merged
vstinner merged 1 commit into from
Sep 18, 2025
Conversation 1 Commits 1 Checks 45 Files changed
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gh-129813, PEP 782: Use PyBytesWriter in bufferedio.c #139121

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26 changes: 11 additions & 15 deletions Modules/_io/bufferedio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1789,18 +1789,18 @@ _bufferedreader_read_fast(buffered *self, Py_ssize_t n)
static PyObject *
_bufferedreader_read_generic(buffered *self, Py_ssize_t n)
{
PyObject *res = NULL;
Py_ssize_t current_size, remaining, written;
char *out;

current_size = Py_SAFE_DOWNCAST(READAHEAD(self), Py_off_t, Py_ssize_t);
if (n <= current_size)
return _bufferedreader_read_fast(self, n);

res = PyBytes_FromStringAndSize(NULL, n);
if (res == NULL)
PyBytesWriter *writer = PyBytesWriter_Create(n);
if (writer == NULL) {
goto error;
out = PyBytes_AS_STRING(res);
}
char *out = PyBytesWriter_GetData(writer);

remaining = n;
written = 0;
if (current_size > 0) {
Expand Down Expand Up @@ -1829,11 +1829,9 @@ _bufferedreader_read_generic(buffered *self, Py_ssize_t n)
if (r == 0 || r == -2) {
/* EOF occurred or read() would block. */
if (r == 0 || written > 0) {
if (_PyBytes_Resize(&res, written))
goto error;
return res;
return PyBytesWriter_FinishWithSize(writer, written);
}
Py_DECREF(res);
PyBytesWriter_Discard(writer);
Py_RETURN_NONE;
}
remaining -= r;
Expand All @@ -1853,11 +1851,9 @@ _bufferedreader_read_generic(buffered *self, Py_ssize_t n)
if (r == 0 || r == -2) {
/* EOF occurred or read() would block. */
if (r == 0 || written > 0) {
if (_PyBytes_Resize(&res, written))
goto error;
return res;
return PyBytesWriter_FinishWithSize(writer, written);
}
Py_DECREF(res);
PyBytesWriter_Discard(writer);
Py_RETURN_NONE;
}
if (remaining > r) {
Expand All @@ -1876,10 +1872,10 @@ _bufferedreader_read_generic(buffered *self, Py_ssize_t n)
break;
}

return res;
return PyBytesWriter_Finish(writer);

error:
Py_XDECREF(res);
PyBytesWriter_Discard(writer);
return NULL;
}

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