commit: 6bde3eedc179da9fdb6486f7238154f88ad9b1a0 Author: Anthony G. Basile <blueness <AT> gentoo <DOT> org> AuthorDate: Fri May 27 13:47:34 2016 +0000 Commit: Brian Dolbec <dolsen <AT> gentoo <DOT> org> CommitDate: Wed Sep 14 21:53:47 2016 +0000 URL: https://gitweb.gentoo.org/proj/portage.git/commit/?id=6bde3eed
pym/portage/util/locale.py: add a C module to help check locale The current method to check for a sane system locale is to use python's ctypes.util.find_library() to construct a full library path to the system libc.so and pass that path to ctypes.CDLL() so we can call toupper() and tolower() directly. However, this gets bogged down in implementation details and fails with musl. We work around this design flaw in ctypes with a small python module written in C which provides thin wrappers to toupper() and tolower(), and only fall back on the current ctypes-based check when this module is not available. This has been tested on glibc, uClibc and musl systems. X-Gentoo-bug: 571444 X-Gentoo-bug-url: https://bugs.gentoo.org/show_bug.cgi?id=571444 Signed-off-by: Anthony G. Basile <blueness <AT> gentoo.org> pym/portage/util/locale.py | 16 ++++++----- setup.py | 6 +++- src/portage_util_libc.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 82 insertions(+), 8 deletions(-) diff --git a/pym/portage/util/locale.py b/pym/portage/util/locale.py index 093eb86..5b09945 100644 --- a/pym/portage/util/locale.py +++ b/pym/portage/util/locale.py @@ -34,13 +34,15 @@ def _check_locale(silent): """ The inner locale check function. """ - - libc_fn = find_library("c") - if libc_fn is None: - return None - libc = LoadLibrary(libc_fn) - if libc is None: - return None + try: + from portage.util import libc + except ImportError: + libc_fn = find_library("c") + if libc_fn is None: + return None + libc = LoadLibrary(libc_fn) + if libc is None: + return None lc = list(range(ord('a'), ord('z')+1)) uc = list(range(ord('A'), ord('Z')+1)) diff --git a/setup.py b/setup.py index 8d20355..d37ab29 100755 --- a/setup.py +++ b/setup.py @@ -47,7 +47,11 @@ x_scripts = { # Dictionary custom modules written in C/C++ here. The structure is # key = module name # value = list of C/C++ source code, path relative to top source directory -x_c_helpers = {} +x_c_helpers = { + 'portage.util.libc' : [ + 'src/portage_util_libc.c', + ], +} class x_build(build): """ Build command with extra build_man call. """ diff --git a/src/portage_util_libc.c b/src/portage_util_libc.c new file mode 100644 index 0000000..977b954 --- /dev/null +++ b/src/portage_util_libc.c @@ -0,0 +1,68 @@ +/* Copyright 2005-2016 Gentoo Foundation + * Distributed under the terms of the GNU General Public License v2 + */ + +#include <Python.h> +#include <stdlib.h> +#include <ctype.h> + +static PyObject * _libc_tolower(PyObject *, PyObject *); +static PyObject * _libc_toupper(PyObject *, PyObject *); + +static PyMethodDef LibcMethods[] = { + {"tolower", _libc_tolower, METH_VARARGS, "Convert to lower case using system locale."}, + {"toupper", _libc_toupper, METH_VARARGS, "Convert to upper case using system locale."}, + {NULL, NULL, 0, NULL} +}; + +#if PY_MAJOR_VERSION >= 3 +static struct PyModuleDef moduledef = { + PyModuleDef_HEAD_INIT, + "libc", /* m_name */ + "Module for converting case using the system locale", /* m_doc */ + -1, /* m_size */ + LibcMethods, /* m_methods */ + NULL, /* m_reload */ + NULL, /* m_traverse */ + NULL, /* m_clear */ + NULL, /* m_free */ +}; + +PyMODINIT_FUNC +PyInit_libc(void) +{ + PyObject *m; + m = PyModule_Create(&moduledef); + return m; +} +#else +PyMODINIT_FUNC +initlibc(void) +{ + Py_InitModule("libc", LibcMethods); +} +#endif + + +static PyObject * +_libc_tolower(PyObject *self, PyObject *args) +{ + int c; + + if (!PyArg_ParseTuple(args, "i", &c)) + return NULL; + + return Py_BuildValue("i", tolower(c)); +} + + +static PyObject * +_libc_toupper(PyObject *self, PyObject *args) +{ + int c; + + if (!PyArg_ParseTuple(args, "i", &c)) + return NULL; + + return Py_BuildValue("i", toupper(c)); +}
