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[WIP] gh-129813: Add PyBytesWriter C API #129814

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[WIP] gh-129813: Add PyBytesWriter C API #129814

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490222f
gh-129813: Add PyBytesWriter C API
vstinner Feb 3, 2025
8f8aeb8
Add documentation
vstinner Feb 13, 2025
68d2fe7
Add PyBytesWriter_GetRemaining()
vstinner Feb 14, 2025
e582385
Optimize bytes_fromformat()
vstinner Feb 14, 2025
7cb444b
Remove PyBytesWriter_GetAllocated()
vstinner Feb 14, 2025
486d7cd
Add 'center' example
vstinner Feb 14, 2025
c4f4c07
Change PyBytesWriter_WriteBytes() argument type to void*
vstinner Feb 16, 2025
18ec24d
Documentation
vstinner Feb 18, 2025
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Add 'center' example
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@vstinner
vstinner committed Feb 14, 2025
commit 486d7cdc287ae7e9d22b9b87f6809051cc762f34
6 changes: 6 additions & 0 deletions Lib/test/test_capi/test_bytes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,12 @@ def test_format(self):
self.assertEqual(writer.get_remaining(), 0)
self.assertEqual(writer.finish(), b'123456')

def test_example_center(self):
self.assertEqual(_testcapi.byteswriter_center(0, b'writer'),
b'writer')
self.assertEqual(_testcapi.byteswriter_center(3, b'writer'),
b' writer ')


if __name__ == "__main__":
unittest.main()
54 changes: 54 additions & 0 deletions Modules/_testcapi/bytes.c
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Expand Up @@ -254,9 +254,63 @@ static PyType_Spec Writer_spec = {
};


static PyObject *
byteswriter_center_example(Py_ssize_t spaces, char *str, Py_ssize_t str_size)
{
PyBytesWriter *writer;
char *buf = PyBytesWriter_Create(&writer, spaces * 2);
if (buf == NULL) {
goto error;
}
assert(PyBytesWriter_GetRemaining(writer, buf) == spaces * 2);

// Add left spaces
memset(buf, ' ', spaces);
buf += spaces;
assert(PyBytesWriter_GetRemaining(writer, buf) == spaces);

// Copy string
buf = PyBytesWriter_Extend(writer, buf, str_size);
if (buf == NULL) {
goto error;
}
assert(PyBytesWriter_GetRemaining(writer, buf) == spaces + str_size);

memcpy(buf, str, str_size);
buf += str_size;
assert(PyBytesWriter_GetRemaining(writer, buf) == spaces);

// Add right spaces
memset(buf, ' ', spaces);
buf += spaces;
assert(PyBytesWriter_GetRemaining(writer, buf) == 0);

return PyBytesWriter_Finish(writer, buf);

error:
PyBytesWriter_Discard(writer);
return NULL;
}


static PyObject *
byteswriter_center(PyObject *Py_UNUSED(module), PyObject *args)
{
Py_ssize_t spaces;
char *str;
Py_ssize_t str_size;
if (!PyArg_ParseTuple(args, "ny#", &spaces, &str, &str_size)) {
return NULL;
}

return byteswriter_center_example(spaces, str, str_size);
}


static PyMethodDef test_methods[] = {
{"bytes_resize", bytes_resize, METH_VARARGS},
{"bytes_join", bytes_join, METH_VARARGS},
{"byteswriter_center", byteswriter_center, METH_VARARGS},
{NULL},
};

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