[glibc/release/2.28/master] Add test for bug 29530

[glibc/release/2.28/master] Add test for bug 29530

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b915921fbf4d32bf68fc3d637413cf96236b3fd

commit 8b915921fbf4d32bf68fc3d637413cf96236b3fd
Author: Andreas Schwab <schwab@suse.de>
Date:   Mon Aug 29 15:05:40 2022 +0200

    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).").
    
    (cherry picked from commit ca6466e8be32369a658035d69542d47603e58a99)

Diff:
---
 stdio-common/Makefile        |  5 ++++-
 stdio-common/tst-grouping2.c | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index d76b47bd5f..ac61093660 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -64,7 +64,9 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
 	 tst-scanf-round \
 	 tst-renameat2 \
 	 tst-printf-bz25691 \
-	 tst-vfprintf-width-prec-alloc
+	 tst-vfprintf-width-prec-alloc \
+	 tst-grouping2 \
+  # tests
 
 test-srcs = tst-unbputc tst-printf tst-printfsz-islongdouble
 
@@ -91,6 +93,7 @@ $(objpfx)bug14.out: $(gen-locales)
 $(objpfx)scanf13.out: $(gen-locales)
 $(objpfx)test-vfprintf.out: $(gen-locales)
 $(objpfx)tst-grouping.out: $(gen-locales)
+$(objpfx)tst-grouping2.out: $(gen-locales)
 $(objpfx)tst-sprintf.out: $(gen-locales)
 $(objpfx)tst-sscanf.out: $(gen-locales)
 $(objpfx)tst-swprintf.out: $(gen-locales)
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>