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Fixing C dependencies
1 parent dcf7aa0 commit f1e59df

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Lines changed: 400 additions & 4 deletions

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‎.gitignore‎

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@@ -1 +1,12 @@
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**/*.pyc
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__pycache__
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.mypy_cache
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lib
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bin
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include
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pyvenv.cfg
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*.egg-info
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*.so
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*.lib
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build
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‎example_code/item_095.py‎

Lines changed: 1 addition & 4 deletions
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@@ -65,10 +65,7 @@ def dot_product(a, b):
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import pathlib
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run_py = pathlib.Path(__file__)
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tools_dir = run_py.parent
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root_dir = tools_dir.parent
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# TODO: Fix this for example code
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library_path = root_dir / "Ch11" / "my_library" / "my_library.lib"
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library_path = run_py.parent / "item_095" / "my_library" / "my_library.lib"
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my_library = ctypes.cdll.LoadLibrary(library_path)
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‎example_code/item_095/my_library/my_library.c‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include "my_library.h"
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double dot_product(int length, double* a, double* b) {
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double result = 0;
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for (int i = 0; i < length; i++) {
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result += a[i] * b[i];
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}
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return result;
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}

‎example_code/item_095/my_library/my_library.h‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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extern double dot_product(int length, double* a, double* b);

‎example_code/item_095/my_library/my_library_test.c‎

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@@ -0,0 +1,52 @@
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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include "my_library.h"
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int main(int argc, char** argv) {
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{
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double a[] = {3, 4, 5};
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double b[] = {-1, 9, -2.5};
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double found = dot_product(3, a, b);
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double expected = 20.5;
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printf("Found %f, Expected %f\n", found, expected);
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assert(fabs(found - expected) < 0.01);
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}
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{
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double a[] = {0, 0, 0};
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double b[] = {1, 1, 1};
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double found = dot_product(3, a, b);
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double expected = 0;
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printf("Found %f, Expected %f\n", found, expected);
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assert(fabs(found - expected) < 0.01);
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}
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{
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double a[] = {-1, -1, -1};
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double b[] = {1, 1, 1};
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double found = dot_product(3, a, b);
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double expected = -3;
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printf("Found %f, Expected %f\n", found, expected);
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assert(fabs(found - expected) < 0.01);
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}
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return 0;
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}

‎example_code/item_096/my_extension/dot_product.c‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
7+
*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
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17+
#include "my_extension.h"
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PyObject *dot_product(PyObject *self, PyObject *args)
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{
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PyObject *left, *right;
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if (!PyArg_ParseTuple(args, "OO", &left, &right)) {
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return NULL;
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}
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if (!PyList_Check(left) || !PyList_Check(right)) {
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PyErr_SetString(PyExc_TypeError, "Both arguments must be lists");
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return NULL;
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}
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Py_ssize_t left_length = PyList_Size(left);
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Py_ssize_t right_length = PyList_Size(right);
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if (left_length == -1 || right_length == -1) {
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return NULL;
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}
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if (left_length != right_length) {
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PyErr_SetString(PyExc_ValueError, "Lists must be the same length");
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return NULL;
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}
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double result = 0;
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for (Py_ssize_t i = 0; i < left_length; i++) {
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PyObject *left_item = PyList_GET_ITEM(left, i);
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PyObject *right_item = PyList_GET_ITEM(right, i);
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double left_double = PyFloat_AsDouble(left_item);
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double right_double = PyFloat_AsDouble(right_item);
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if (PyErr_Occurred()) {
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return NULL;
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}
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result += left_double * right_double;
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}
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return PyFloat_FromDouble(result);
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}

‎example_code/item_096/my_extension/init.c‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
14+
* limitations under the License.
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*/
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#include "my_extension.h"
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static PyMethodDef my_extension_methods[] = {
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{
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"dot_product",
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dot_product,
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METH_VARARGS,
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"Compute dot product",
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},
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{
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NULL,
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NULL,
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0,
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NULL,
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},
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};
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static struct PyModuleDef my_extension = {
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PyModuleDef_HEAD_INIT,
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"my_extension",
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"My C-extension module",
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-1,
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my_extension_methods,
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};
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PyMODINIT_FUNC
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PyInit_my_extension(void)
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{
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return PyModule_Create(&my_extension);
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}

‎example_code/item_096/my_extension/my_extension.h‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
10+
* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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PyObject *dot_product(PyObject *self, PyObject *args);

‎example_code/item_096/my_extension2/dot_product.c‎

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/*
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* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
6+
* You may obtain a copy of the License at
7+
*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
10+
* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
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17+
#include "my_extension2.h"
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19+
PyObject *dot_product(PyObject *self, PyObject *args)
20+
{
21+
PyObject *left, *right;
22+
if (!PyArg_ParseTuple(args, "OO", &left, &right)) {
23+
return NULL;
24+
}
25+
PyObject *left_iter = PyObject_GetIter(left);
26+
if (left_iter == NULL) {
27+
return NULL;
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}
29+
PyObject *right_iter = PyObject_GetIter(right);
30+
if (right_iter == NULL) {
31+
Py_DECREF(left_iter);
32+
return NULL;
33+
}
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35+
PyObject *left_item = NULL;
36+
PyObject *right_item = NULL;
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PyObject *multiplied = NULL;
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PyObject *result = PyLong_FromLong(0);
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40+
while (1) {
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Py_CLEAR(left_item);
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Py_CLEAR(right_item);
43+
Py_CLEAR(multiplied);
44+
left_item = PyIter_Next(left_iter);
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right_item = PyIter_Next(right_iter);
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47+
if (left_item == NULL && right_item == NULL) {
48+
break;
49+
} else if (left_item == NULL || right_item == NULL) {
50+
PyErr_SetString(PyExc_ValueError, "Arguments had unequal length");
51+
break;
52+
}
53+
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multiplied = PyNumber_Multiply(left_item, right_item);
55+
if (multiplied == NULL) {
56+
break;
57+
}
58+
PyObject *added = PyNumber_Add(result, multiplied);
59+
if (added == NULL) {
60+
break;
61+
}
62+
Py_CLEAR(result);
63+
result = added;
64+
}
65+
66+
Py_CLEAR(left_item);
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Py_CLEAR(right_item);
68+
Py_CLEAR(multiplied);
69+
Py_DECREF(left_iter);
70+
Py_DECREF(right_iter);
71+
72+
if (PyErr_Occurred()) {
73+
Py_CLEAR(result);
74+
return NULL;
75+
}
76+
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return result;
78+
}

‎example_code/item_096/my_extension2/init.c‎

Lines changed: 46 additions & 0 deletions
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@@ -0,0 +1,46 @@
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/*
2+
* Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
3+
*
4+
* Licensed under the Apache License, Version 2.0 (the "License");
5+
* you may not use this file except in compliance with the License.
6+
* You may obtain a copy of the License at
7+
*
8+
* http://www.apache.org/licenses/LICENSE-2.0
9+
*
10+
* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
16+
17+
#include "my_extension2.h"
18+
19+
static PyMethodDef my_extension2_methods[] = {
20+
{
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"dot_product",
22+
dot_product,
23+
METH_VARARGS,
24+
"Compute dot product",
25+
},
26+
{
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NULL,
28+
NULL,
29+
0,
30+
NULL,
31+
},
32+
};
33+
34+
static struct PyModuleDef my_extension2 = {
35+
PyModuleDef_HEAD_INIT,
36+
"my_extension2",
37+
"My second C-extension module",
38+
-1,
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my_extension2_methods,
40+
};
41+
42+
PyMODINIT_FUNC
43+
PyInit_my_extension2(void)
44+
{
45+
return PyModule_Create(&my_extension2);
46+
}

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