[Python-checkins] gh-96848: Fix -X int_max_str_digits option parsing (#96988)

[vstinner]

https://github.com/python/cpython/commit/41351662bcd21672d8ccfa62fe44d72027e6bcf8
commit: 41351662bcd21672d8ccfa62fe44d72027e6bcf8
branch: main
author: Victor Stinner <vstinner at python.org>
committer: vstinner <vstinner at python.org>
date: 2022-09-26T17:20:08+02:00
summary:

gh-96848: Fix -X int_max_str_digits option parsing (#96988)

Fix command line parsing: reject "-X int_max_str_digits" option with
no value (invalid) when the PYTHONINTMAXSTRDIGITS environment
variable is set to a valid limit.

files:
A Misc/NEWS.d/next/Core and Builtins/2022-09-21-14-38-31.gh-issue-96848.WuoLzU.rst
M Lib/test/test_cmd_line.py
M Python/initconfig.c

diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index db967088804a..3de8c3d4b11f 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -871,6 +871,8 @@ def test_int_max_str_digits(self):
         assert_python_failure('-X', 'int_max_str_digits', '-c', code)
         assert_python_failure('-X', 'int_max_str_digits=foo', '-c', code)
         assert_python_failure('-X', 'int_max_str_digits=100', '-c', code)
+        assert_python_failure('-X', 'int_max_str_digits', '-c', code,
+                              PYTHONINTMAXSTRDIGITS='4000')
 
         assert_python_failure('-c', code, PYTHONINTMAXSTRDIGITS='foo')
         assert_python_failure('-c', code, PYTHONINTMAXSTRDIGITS='100')
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-09-21-14-38-31.gh-issue-96848.WuoLzU.rst b/Misc/NEWS.d/next/Core and Builtins/2022-09-21-14-38-31.gh-issue-96848.WuoLzU.rst
new file mode 100644
index 000000000000..a9b04ce87d4d
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-09-21-14-38-31.gh-issue-96848.WuoLzU.rst	
@@ -0,0 +1,3 @@
+Fix command line parsing: reject :option:`-X int_max_str_digits <-X>` option
+with no value (invalid) when the :envvar:`PYTHONINTMAXSTRDIGITS` environment
+variable is set to a valid limit. Patch by Victor Stinner.
diff --git a/Python/initconfig.c b/Python/initconfig.c
index f18ec4068bc4..bfbb7dbacf90 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -1779,10 +1779,10 @@ static PyStatus
 config_init_int_max_str_digits(PyConfig *config)
 {
     int maxdigits;
-    int valid = 0;
 
     const char *env = config_get_env(config, "PYTHONINTMAXSTRDIGITS");
     if (env) {
+        int valid = 0;
         if (!_Py_str_to_int(env, &maxdigits)) {
             valid = ((maxdigits == 0) || (maxdigits >= _PY_LONG_MAX_STR_DIGITS_THRESHOLD));
         }
@@ -1800,6 +1800,7 @@ config_init_int_max_str_digits(PyConfig *config)
     const wchar_t *xoption = config_get_xoption(config, L"int_max_str_digits");
     if (xoption) {
         const wchar_t *sep = wcschr(xoption, L'=');
+        int valid = 0;
         if (sep) {
             if (!config_wstr_to_int(sep + 1, &maxdigits)) {
                 valid = ((maxdigits == 0) || (maxdigits >= _PY_LONG_MAX_STR_DIGITS_THRESHOLD));