Add test for bug 29530

This tests for a bug that was introduced in commit edc1686af0 ("vfprintf:
Reuse work_buffer in group_number") and fixed as a side effect of commit
6caddd34bd ("Remove most vfprintf width/precision-dependent allocations
(bug 14231, bug 26211).").

1 files changed, 39 insertions, 0 deletions

diff --git a/stdio-common/tst-grouping2.c b/stdio-common/tst-grouping2.c
new file mode 100644
index 0000000000..3024c942a6
--- /dev/null
+++ b/stdio-common/tst-grouping2.c
@@ -0,0 +1,39 @@
+/* Test printf with grouping and large width (bug 29530)
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <locale.h>
+#include <stdio.h>
+#include <support/check.h>
+#include <support/support.h>
+
+static int
+do_test (void)
+{
+  const int field_width = 1000;
+  char buf[field_width + 1];
+
+  xsetlocale (LC_NUMERIC, "de_DE.UTF-8");
+
+  /* This used to crash in group_number.  */
+  TEST_COMPARE (sprintf (buf, "%'*d", field_width, 1000), field_width);
+  TEST_COMPARE_STRING (buf + field_width - 6, " 1.000");
+
+  return 0;
+}
+
+#include <support/test-driver.c>