python/python_api.h

/*
 * Copyright (c) 2009-2021, Google LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Google LLC nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef PYUPB_PYTHON_H__
#define PYUPB_PYTHON_H__

// We restrict ourselves to the limited API, so that a single build can be
// ABI-compatible with a wide range of Python versions.
//
// The build system will define Py_LIMITED_API as appropriate (see BUILD). We
// only want to define it for our distribution packages, since we can do some
// extra assertions when Py_LIMITED_API is not defined.  Also Py_LIMITED_API is
// incompatible with Py_DEBUG.

// #define Py_LIMITED_API <val>  // Defined by build system when appropriate.

#include "Python.h"

// Ideally we could restrict ourselves to the limited API of 3.7, but this is
// a very important function that was not officially added to the limited API
// until 3.10.  Without this function, there is no way of getting data from a
// Python `str` object without a copy.
//
// While this function was not *officially* added to the limited API until
// Python 3.10, In practice it has been stable since Python 3.1.
//   https://bugs.python.org/issue41784
//
// On Linux/ELF and macOS/Mach-O, we can get away with using this function with
// the limited API prior to 3.10.

#if (defined(__linux__) || defined(__APPLE__)) && defined(Py_LIMITED_API) && \
    Py_LIMITED_API < 0x03100000
PyAPI_FUNC(const char*)
    PyUnicode_AsUTF8AndSize(PyObject* unicode, Py_ssize_t* size);
#endif

#endif  // PYUPB_PYTHON_H__