churchyard / rpms / python3

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diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
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index c0e64d6..0bb28da 100644
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--- a/Doc/using/cmdline.rst
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+++ b/Doc/using/cmdline.rst
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@@ -711,6 +711,35 @@ conflict.
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    .. versionadded:: 3.6
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+
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+.. envvar:: PYTHONCOERCECLOCALE
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+
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+   If set to a non-empty string, causes the main Python command line application
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+   to skip coercing the legacy ASCII-based C locale to a more capable UTF-8
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+   based alternative. Note that this setting is checked even when the
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+   :option:`-E` or :option:`-I` options are used, as it is handled prior to
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+   the processing of command line options.
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+
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+   If this variable is *not* set, and the current locale reported for the
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+   ``LC_CTYPE`` category is the default ``C`` locale, then the Python CLI will
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+   attempt to configure one of the following locales for the given locale
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+   categories before loading the interpreter runtime:
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+
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+   * ``C.UTF-8` (``LC_ALL``)
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+   * ``C.utf8` (``LC_ALL``)
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+   * ``UTF-8` (``LC_CTYPE``)
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+
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+   If setting one of these locale categories succeeds, then the matching
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+   environment variables will be set (both ``LC_ALL` and ``LANG`` for the
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+   ``LC_ALL`` category, and ``LC_CTYPE`` for the ``LC_CTYPE`` category),
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+   and (if not already set to a non-empty string) :envvar:`PYTHONIOENCODING`
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+   will be set to ``utf-8:surrogateescape``.
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+
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+   Availability: \*nix
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+
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+   .. versionadded:: 3.7
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+      See :pep:`538` for more details.
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+
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 Debug-mode variables
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 ~~~~~~~~~~~~~~~~~~~~
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diff --git a/Lib/test/support/script_helper.py b/Lib/test/support/script_helper.py
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index 80889b1..1a1a862 100644
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--- a/Lib/test/support/script_helper.py
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+++ b/Lib/test/support/script_helper.py
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@@ -51,8 +51,35 @@ def interpreter_requires_environment():
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     return __cached_interp_requires_environment
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-_PythonRunResult = collections.namedtuple("_PythonRunResult",
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-                                          ("rc", "out", "err"))
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+class _PythonRunResult(collections.namedtuple("_PythonRunResult",
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+                                          ("rc", "out", "err"))):
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+    """Helper for reporting Python subprocess run results"""
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+    def fail(self, cmd_line):
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+        """Provide helpful details about failed subcommand runs"""
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+        # Limit to 80 lines to ASCII characters
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+        maxlen = 80 * 100
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+        out, err = self.out, self.err
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+        if len(out) > maxlen:
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+            out = b'(... truncated stdout ...)' + out[-maxlen:]
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+        if len(err) > maxlen:
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+            err = b'(... truncated stderr ...)' + err[-maxlen:]
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+        out = out.decode('ascii', 'replace').rstrip()
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+        err = err.decode('ascii', 'replace').rstrip()
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+        raise AssertionError("Process return code is %d\n"
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+                             "command line: %r\n"
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+                             "\n"
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+                             "stdout:\n"
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+                             "---\n"
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+                             "%s\n"
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+                             "---\n"
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+                             "\n"
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+                             "stderr:\n"
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+                             "---\n"
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+                             "%s\n"
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+                             "---"
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+                             % (self.rc, cmd_line,
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+                                out,
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+                                err))
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 # Executing the interpreter in a subprocess
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@@ -99,30 +126,7 @@ def run_python_until_end(*args, **env_vars):
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 def _assert_python(expected_success, *args, **env_vars):
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     res, cmd_line = run_python_until_end(*args, **env_vars)
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     if (res.rc and expected_success) or (not res.rc and not expected_success):
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-        # Limit to 80 lines to ASCII characters
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-        maxlen = 80 * 100
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-        out, err = res.out, res.err
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-        if len(out) > maxlen:
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-            out = b'(... truncated stdout ...)' + out[-maxlen:]
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-        if len(err) > maxlen:
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-            err = b'(... truncated stderr ...)' + err[-maxlen:]
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-        out = out.decode('ascii', 'replace').rstrip()
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-        err = err.decode('ascii', 'replace').rstrip()
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-        raise AssertionError("Process return code is %d\n"
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-                             "command line: %r\n"
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-                             "\n"
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-                             "stdout:\n"
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-                             "---\n"
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-                             "%s\n"
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-                             "---\n"
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-                             "\n"
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-                             "stderr:\n"
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-                             "---\n"
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-                             "%s\n"
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-                             "---"
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-                             % (res.rc, cmd_line,
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-                                out,
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-                                err))
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+        res.fail(cmd_line)
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     return res
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 def assert_python_ok(*args, **env_vars):
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diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
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index 2a53f3d..ece84af 100644
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--- a/Lib/test/test_capi.py
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+++ b/Lib/test/test_capi.py
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@@ -386,7 +386,7 @@ class EmbeddingTests(unittest.TestCase):
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     def test_subinterps(self):
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         # This is just a "don't crash" test
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         out, err = self.run_embedded_interpreter("repeated_init_and_subinterpreters")
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-        if support.verbose:
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+        if support.verbose > 1:
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             print()
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             print(out)
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             print(err)
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@@ -404,14 +404,15 @@ class EmbeddingTests(unittest.TestCase):
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     def test_forced_io_encoding(self):
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         # Checks forced configuration of embedded interpreter IO streams
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         out, err = self.run_embedded_interpreter("forced_io_encoding")
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-        if support.verbose:
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+        if support.verbose > 1:
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             print()
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             print(out)
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             print(err)
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-        expected_errors = sys.__stdout__.errors
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-        expected_stdin_encoding = sys.__stdin__.encoding
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+        expected_errors = "surrogateescape"
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+        expected_stdin_encoding = "UTF-8"
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         expected_pipe_encoding = self._get_default_pipe_encoding()
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         expected_output = '\n'.join([
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+        "Setting PYTHONIOENCODING=UTF-8:surrogateescape",
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         "--- Use defaults ---",
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         "Expected encoding: default",
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         "Expected errors: default",
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diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
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index b71bb9f..56867fc 100644
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--- a/Lib/test/test_cmd_line.py
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+++ b/Lib/test/test_cmd_line.py
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@@ -9,8 +9,9 @@ import sys
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 import subprocess
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 import tempfile
Iryna Shcherbina aba719
 from test.support import script_helper, is_android
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-from test.support.script_helper import (spawn_python, kill_python, assert_python_ok,
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-    assert_python_failure)
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+from test.support.script_helper import (
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+    spawn_python, kill_python, assert_python_ok, assert_python_failure
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+)
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 # XXX (ncoghlan): Move to script_helper and make consistent with run_python
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@@ -151,6 +152,7 @@ class CmdLineTest(unittest.TestCase):
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         env = os.environ.copy()
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         # Use C locale to get ascii for the locale encoding
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         env['LC_ALL'] = 'C'
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+        env['PYTHONCOERCECLOCALE'] = '0'
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         code = (
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             b'import locale; '
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             b'print(ascii("' + undecodable + b'"), '
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diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
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index df9ebd4..63145e4 100644
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--- a/Lib/test/test_sys.py
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+++ b/Lib/test/test_sys.py
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@@ -680,6 +680,7 @@ class SysModuleTest(unittest.TestCase):
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         # Force the POSIX locale
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         env = os.environ.copy()
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         env["LC_ALL"] = "C"
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+        env["PYTHONCOERCECLOCALE"] = "0"
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         code = '\n'.join((
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             'import sys',
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             'def dump(name):',
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diff --git a/Programs/_testembed.c b/Programs/_testembed.c
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index a68d4fa..1494452 100644
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--- a/Programs/_testembed.c
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+++ b/Programs/_testembed.c
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@@ -1,4 +1,5 @@
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-#include <Python.h>
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+#include "Python.h"
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+#include "pyconfig.h"
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 #include <stdio.h>
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 /*********************************************************
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@@ -106,6 +107,9 @@ static void check_stdio_details(const char *encoding, const char * errors)
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 static int test_forced_io_encoding(void)
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 {
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+    /* Ensure consistent "defaults" */
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+    printf("Setting PYTHONIOENCODING=UTF-8:surrogateescape\n");
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+    setenv("PYTHONIOENCODING", "UTF-8:surrogateescape", 1);
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     /* Check various combinations */
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     printf("--- Use defaults ---\n");
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     check_stdio_details(NULL, NULL);
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@@ -126,6 +130,20 @@ static int test_forced_io_encoding(void)
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     return 0;
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 }
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+static int test_c_locale_warning(void)
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+{
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+#ifdef PY_WARN_ON_C_LOCALE
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+    /* Force use of the C locale */
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+    setenv("LC_ALL", "C", 1);
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+
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+    _testembed_Py_Initialize();
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+    Py_Finalize();
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+#else
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+    printf("C locale compatibility warning disabled at compile time\n");
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+#endif
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+    return 0;
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+}
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+
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 /* *********************************************************
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  * List of test cases and the function that implements it.
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  * 
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@@ -147,6 +165,7 @@ struct TestCase
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 static struct TestCase TestCases[] = {
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     { "forced_io_encoding", test_forced_io_encoding },
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     { "repeated_init_and_subinterpreters", test_repeated_init_and_subinterpreters },
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+    { "c_locale_warning", test_c_locale_warning },
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     { NULL, NULL }
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 };
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diff --git a/Programs/python.c b/Programs/python.c
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index a7afbc7..b5edebb 100644
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--- a/Programs/python.c
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+++ b/Programs/python.c
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@@ -15,6 +15,110 @@ wmain(int argc, wchar_t **argv)
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 }
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 #else
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+/* Helpers to better handle the legacy C locale
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+ *
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+ * The legacy C locale assumes ASCII as the default text encoding, which
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+ * causes problems not only for the CPython runtime, but also other
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+ * components like GNU readline.
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+ *
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+ * Accordingly, when the CLI detects it, it attempts to coerce it to a
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+ * more capable UTF-8 based alternative.
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+ *
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+ * See the documentation of the PYTHONCOERCECLOCALE setting for more details.
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+ *
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+ */
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+
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+#ifdef PY_COERCE_C_LOCALE
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+static const char *_C_LOCALE_COERCION_WARNING =
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+    "Python detected LC_CTYPE=C: %.20s coerced to %.20s (set another locale "
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+    "or PYTHONCOERCECLOCALE=0 to disable this locale coercion behaviour).\n";
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+
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+typedef struct _CandidateLocale {
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+    const char *locale_name;
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+    int category;
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+} _LocaleCoercionTarget;
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+
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+static _LocaleCoercionTarget _TARGET_LOCALES[] = {
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+    { "C.UTF-8", LC_ALL },
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+    { "C.utf8", LC_ALL },
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+    { "UTF-8", LC_CTYPE },
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+    { NULL, 0 }
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+};
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+
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+void
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+_coerce_default_locale_settings(const _LocaleCoercionTarget *target)
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+{
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+    const char *newloc = target->locale_name;
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+    int category = target->category;
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+
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+    /* Reset locale back to currently configured defaults */
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+    setlocale(LC_ALL, "");
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+
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+    /* Set the relevant locale environment variables */
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+    if (category == LC_ALL) {
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+        const char *env_vars_updated = "LC_ALL & LANG";
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+        if (setenv("LC_ALL", newloc, 1)) {
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+            fprintf(stderr,
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+                    "Error setting LC_ALL, skipping C locale coercion\n");
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+            return;
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+        }
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+        if (setenv("LANG", newloc, 1)) {
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+            fprintf(stderr,
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+                    "Error setting LANG during C locale coercion\n");
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+            env_vars_updated = "LC_ALL";
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+        }
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+        fprintf(stderr, _C_LOCALE_COERCION_WARNING, env_vars_updated, newloc);
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+    } else if (category == LC_CTYPE) {
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+        if (setenv("LC_CTYPE", newloc, 1)) {
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+            fprintf(stderr,
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+                    "Error setting LC_CTYPE, skipping C locale coercion\n");
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+            return;
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+        }
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+        fprintf(stderr, _C_LOCALE_COERCION_WARNING, "LC_CTYPE", newloc);
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+    } else {
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+        fprintf(stderr, "Locale coercion must target LC_ALL or LC_CTYPE\n");
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+        return;
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+    }
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+
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+    /* Set PYTHONIOENCODING if not already set */
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+    if (setenv("PYTHONIOENCODING", "utf-8:surrogateescape", 0)) {
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+        fprintf(stderr,
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+                "Error setting PYTHONIOENCODING during C locale coercion\n");
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+    }
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+
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+    /* Reconfigure with the overridden environment variables */
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+    setlocale(LC_ALL, "");
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+}
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+
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+void
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+_handle_legacy_c_locale(void)
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+{
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+    const char *coerce_c_locale = getenv("PYTHONCOERCECLOCALE");
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+    /* We ignore the Python -E and -I flags here, as we need to sort out
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+     * the locale settings *before* we try to do anything with the command
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+     * line arguments. For cross-platform debugging purposes, we also need
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+     * to give end users a way to force even scripts that are otherwise
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+     * isolated from their environment to use the legacy ASCII-centric C
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+     * locale.
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+    */
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+    if (coerce_c_locale == NULL || strncmp(coerce_c_locale, "0", 2) != 0) {
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+        /* PYTHONCOERCECLOCALE is not set, or is not set to exactly "0" */
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+        const _LocaleCoercionTarget *target = NULL;
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+        for (target = _TARGET_LOCALES; target->locale_name; target++) {
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+            const char *reconfigured_locale = setlocale(target->category,
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+                                                        target->locale_name);
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+            if (reconfigured_locale != NULL) {
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+                /* Successfully configured locale, so make it the default */
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+                _coerce_default_locale_settings(target);
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+                return;
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+            }
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+        }
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+
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+    }
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+    /* No C locale warning here, as Py_Initialize will emit one later */
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+}
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+#endif
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+
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 int
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 main(int argc, char **argv)
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 {
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@@ -49,7 +153,26 @@ main(int argc, char **argv)
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         return 1;
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     }
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+#ifdef __ANDROID__
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+    /* Passing "" to setlocale() on Android requests the C locale rather
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+     * than checking environment variables, so request C.UTF-8 explicitly
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+     */
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+    setlocale(LC_ALL, "C.UTF-8");
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+#else
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+    /* Reconfigure the locale to the default for this process */
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     setlocale(LC_ALL, "");
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+#endif
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+
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+#ifdef PY_COERCE_C_LOCALE
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+    /* When the LC_CTYPE category still claims to be using the C locale,
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+       assume configuration error and try for a UTF-8 based locale instead */
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+    const char *ctype_loc = setlocale(LC_CTYPE, NULL);
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+    if (ctype_loc != NULL && strcmp(ctype_loc, "C") == 0) {
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+        _handle_legacy_c_locale();
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+    }
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+#endif
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+
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+    /* Convert from char to wchar_t based on the locale settings */
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     for (i = 0; i < argc; i++) {
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         argv_copy[i] = Py_DecodeLocale(argv[i], NULL);
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         if (!argv_copy[i]) {
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diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
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index a4f7f82..dd58dc9 100644
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--- a/Python/pylifecycle.c
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+++ b/Python/pylifecycle.c
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@@ -301,6 +301,31 @@ import_init(PyInterpreterState *interp, PyObject *sysmod)
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 }
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+#ifdef PY_WARN_ON_C_LOCALE
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+static const char *_C_LOCALE_WARNING =
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+    "Python runtime initialized with LC_CTYPE=C (a locale with default ASCII "
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+    "encoding), which may cause Unicode compatibility problems. Using C.UTF-8, "
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+    "C.utf8, or UTF-8 (if available) as alternative Unicode-compatible "
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+    "locales is recommended.\n";
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+
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+static void
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+_emit_stderr_warning_for_c_locale(void)
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+{
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+    const char *coerce_c_locale = getenv("PYTHONCOERCECLOCALE");
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+    /* We don't emit a warning if locale coercion has been explicitly disabled.
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+     *
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+     * For consistency with the corresponding check in Programs/python.c
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+     * we ignore the Python -E and -I flags here.
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+     */
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+    if (coerce_c_locale == NULL || strncmp(coerce_c_locale, "0", 2) != 0) {
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+        const char *ctype_loc = setlocale(LC_CTYPE, NULL);
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+        if (ctype_loc != NULL && strcmp(ctype_loc, "C") == 0) {
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+            fprintf(stderr, "%s", _C_LOCALE_WARNING);
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+        }
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+    }
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+}
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+#endif
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+
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 void
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 _Py_InitializeEx_Private(int install_sigs, int install_importlib)
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 {
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@@ -315,11 +340,19 @@ _Py_InitializeEx_Private(int install_sigs, int install_importlib)
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     initialized = 1;
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     _Py_Finalizing = NULL;
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-#ifdef HAVE_SETLOCALE
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+#ifdef __ANDROID__
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+    /* Passing "" to setlocale() on Android requests the C locale rather
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+     * than checking environment variables, so request C.UTF-8 explicitly
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+     */
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+    setlocale(LC_CTYPE, "C.UTF-8");
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+#else
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     /* Set up the LC_CTYPE locale, so we can obtain
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        the locale's charset without having to switch
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        locales. */
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     setlocale(LC_CTYPE, "");
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+#ifdef PY_WARN_ON_C_LOCALE
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+    _emit_stderr_warning_for_c_locale();
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+#endif
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 #endif
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     if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0')
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diff --git a/configure b/configure
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index 6bcddb7..13052d6 100755
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--- a/configure
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+++ b/configure
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@@ -834,6 +834,8 @@ with_thread
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 enable_ipv6
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 with_doc_strings
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 with_pymalloc
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+with_c_locale_coercion
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+with_c_locale_warning
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 with_valgrind
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 with_dtrace
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 with_fpectl
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@@ -1527,6 +1529,12 @@ Optional Packages:
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                           deprecated; use --with(out)-threads
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   --with(out)-doc-strings disable/enable documentation strings
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   --with(out)-pymalloc    disable/enable specialized mallocs
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+  --with(out)-c-locale-coercion
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+                          disable/enable C locale coercion to a UTF-8 based
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+                          locale
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+  --with(out)-c-locale-warning
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+                          disable/enable locale compatibility warning in the C
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+                          locale
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   --with-valgrind         Enable Valgrind support
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   --with(out)-dtrace      disable/enable DTrace support
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   --with-fpectl           enable SIGFPE catching
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@@ -11016,6 +11024,52 @@ fi
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 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_pymalloc" >&5
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 $as_echo "$with_pymalloc" >&6; }
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+# Check for --with-c-locale-coercion
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-c-locale-coercion" >&5
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+$as_echo_n "checking for --with-c-locale-coercion... " >&6; }
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+
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+# Check whether --with-c-locale-coercion was given.
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+if test "${with_c_locale_coercion+set}" = set; then :
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+  withval=$with_c_locale_coercion;
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+fi
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+
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+
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+if test -z "$with_c_locale_coercion"
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+then
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+    with_c_locale_coercion="yes"
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+fi
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+if test "$with_c_locale_coercion" != "no"
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+then
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+
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+$as_echo "#define PY_COERCE_C_LOCALE 1" >>confdefs.h
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+
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_c_locale_coercion" >&5
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+$as_echo "$with_c_locale_coercion" >&6; }
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+
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+# Check for --with-c-locale-warning
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-c-locale-warning" >&5
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+$as_echo_n "checking for --with-c-locale-warning... " >&6; }
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+
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+# Check whether --with-c-locale-warning was given.
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+if test "${with_c_locale_warning+set}" = set; then :
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+  withval=$with_c_locale_warning;
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+fi
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+
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+
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+if test -z "$with_c_locale_warning"
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+then
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+    with_c_locale_warning="yes"
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+fi
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+if test "$with_c_locale_warning" != "no"
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+then
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+
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+$as_echo "#define PY_WARN_ON_C_LOCALE 1" >>confdefs.h
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+
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_c_locale_warning" >&5
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+$as_echo "$with_c_locale_warning" >&6; }
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+
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 # Check for Valgrind support
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 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-valgrind" >&5
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 $as_echo_n "checking for --with-valgrind... " >&6; }
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diff --git a/configure.ac b/configure.ac
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index e222c21..a1653e7 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -3287,6 +3287,40 @@ then
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 fi
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 AC_MSG_RESULT($with_pymalloc)
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+# Check for --with-c-locale-coercion
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+AC_MSG_CHECKING(for --with-c-locale-coercion)
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+AC_ARG_WITH(c-locale-coercion,
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+            AS_HELP_STRING([--with(out)-c-locale-coercion],
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+              [disable/enable C locale coercion to a UTF-8 based locale]))
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+
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+if test -z "$with_c_locale_coercion"
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+then
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+    with_c_locale_coercion="yes"
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+fi
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+if test "$with_c_locale_coercion" != "no"
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+then
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+    AC_DEFINE(PY_COERCE_C_LOCALE, 1,
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+      [Define if you want to coerce the C locale to a UTF-8 based locale])
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+fi
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+AC_MSG_RESULT($with_c_locale_coercion)
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+
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+# Check for --with-c-locale-warning
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+AC_MSG_CHECKING(for --with-c-locale-warning)
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+AC_ARG_WITH(c-locale-warning,
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+            AS_HELP_STRING([--with(out)-c-locale-warning],
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+              [disable/enable locale compatibility warning in the C locale]))
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+
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+if test -z "$with_c_locale_warning"
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+then
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+    with_c_locale_warning="yes"
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+fi
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+if test "$with_c_locale_warning" != "no"
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+then
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+    AC_DEFINE(PY_WARN_ON_C_LOCALE, 1,
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+      [Define to emit a locale compatibility warning in the C locale])
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+fi
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+AC_MSG_RESULT($with_c_locale_warning)
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+
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 # Check for Valgrind support
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 AC_MSG_CHECKING([for --with-valgrind])
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 AC_ARG_WITH([valgrind],
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diff --git a/pyconfig.h.in b/pyconfig.h.in
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index e7a836c..11e0798 100644
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--- a/pyconfig.h.in
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+++ b/pyconfig.h.in
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@@ -1241,9 +1241,15 @@
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 /* Define as the preferred size in bits of long digits */
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 #undef PYLONG_BITS_IN_DIGIT
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+/* Define if you want to coerce the C locale to a UTF-8 based locale */
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+#undef PY_COERCE_C_LOCALE
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+
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 /* Define to printf format modifier for Py_ssize_t */
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 #undef PY_FORMAT_SIZE_T
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+/* Define to emit a locale compatibility warning in the C locale */
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+#undef PY_WARN_ON_C_LOCALE
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+
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 /* Define if you want to build an interpreter with many run-time checks. */
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 #undef Py_DEBUG
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