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gh-129813, PEP 782: Use PyBytesWriter in _curses #138920

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Merged
vstinner merged 1 commit into from
Sep 15, 2025
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gh-129813, PEP 782: Use PyBytesWriter in _curses #138920

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gh-129813, PEP 782: Use PyBytesWriter in _curses 
Replace PyBytes_FromStringAndSize(NULL, size) and _PyBytes_Resize()
with the new public PyBytesWriter API.
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@vstinner
vstinner committed Sep 15, 2025
commit 33fb1ca5985156e0726002e52ec6e3c7a16e08a0
24 changes: 10 additions & 14 deletions Modules/_cursesmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1932,7 +1932,6 @@ PyCursesWindow_getstr(PyObject *op, PyObject *args)
int rtn, use_xy = 0, y = 0, x = 0;
unsigned int max_buf_size = 2048;
unsigned int n = max_buf_size - 1;
PyObject *res;

if (!curses_clinic_parse_optional_xy_n(args, &y, &x, &n, &use_xy,
"_curses.window.instr"))
Expand All @@ -1941,11 +1940,11 @@ PyCursesWindow_getstr(PyObject *op, PyObject *args)
}

n = Py_MIN(n, max_buf_size - 1);
res = PyBytes_FromStringAndSize(NULL, n + 1);
if (res == NULL) {
PyBytesWriter *writer = PyBytesWriter_Create(n + 1);
if (writer == NULL) {
return NULL;
}
char *buf = PyBytes_AS_STRING(res);
char *buf = PyBytesWriter_GetData(writer);

if (use_xy) {
Py_BEGIN_ALLOW_THREADS
Expand All @@ -1965,11 +1964,10 @@ PyCursesWindow_getstr(PyObject *op, PyObject *args)
}

if (rtn == ERR) {
Py_DECREF(res);
PyBytesWriter_Discard(writer);
return Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);
}
_PyBytes_Resize(&res, strlen(buf)); // 'res' is set to NULL on failure
return res;
return PyBytesWriter_FinishWithSize(writer, strlen(buf));
}

/*[clinic input]
Expand Down Expand Up @@ -2130,7 +2128,6 @@ PyCursesWindow_instr(PyObject *op, PyObject *args)
int rtn, use_xy = 0, y = 0, x = 0;
unsigned int max_buf_size = 2048;
unsigned int n = max_buf_size - 1;
PyObject *res;

if (!curses_clinic_parse_optional_xy_n(args, &y, &x, &n, &use_xy,
"_curses.window.instr"))
Expand All @@ -2139,11 +2136,11 @@ PyCursesWindow_instr(PyObject *op, PyObject *args)
}

n = Py_MIN(n, max_buf_size - 1);
res = PyBytes_FromStringAndSize(NULL, n + 1);
if (res == NULL) {
PyBytesWriter *writer = PyBytesWriter_Create(n + 1);
if (writer == NULL) {
return NULL;
}
char *buf = PyBytes_AS_STRING(res);
char *buf = PyBytesWriter_GetData(writer);

if (use_xy) {
rtn = mvwinnstr(self->win, y, x, buf, n);
Expand All @@ -2153,11 +2150,10 @@ PyCursesWindow_instr(PyObject *op, PyObject *args)
}

if (rtn == ERR) {
Py_DECREF(res);
PyBytesWriter_Discard(writer);
return Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);
}
_PyBytes_Resize(&res, strlen(buf)); // 'res' is set to NULL on failure
return res;
return PyBytesWriter_FinishWithSize(writer, strlen(buf));
}

/*[clinic input]
Expand Down
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