Fix BZ #18872 -- memory leak in printf_positional.

1 files changed, 70 insertions, 0 deletions

diff --git a/stdio-common/tst-printf-bz18872.sh b/stdio-common/tst-printf-bz18872.sh
new file mode 100644
index 0000000000..0127e73024
--- /dev/null
+++ b/stdio-common/tst-printf-bz18872.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+# Copyright (C) 2015 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
+# <http://www.gnu.org/licenses/>.
+
+# To test BZ #18872, we need a printf() with 10K arguments.
+# Such a printf could be generated with non-trivial macro
+# application, but it's simpler to generate the test source
+# via this script.
+
+n_args=10000
+
+cat <<'EOF'
+#include <stdio.h>
+#include <mcheck.h>
+
+/*
+  Compile do_test without optimization: GCC 4.9/5.0/6.0 takes a long time
+  to build this source. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396  */
+#pragma GCC push_options
+#pragma GCC optimize ("-O0")
+
+int do_test (void)
+{
+    mtrace ();
+    printf (
+EOF
+
+for ((j = 0; j < $n_args / 10; j++)); do
+  for ((k = 0; k < 10; k++)); do
+    printf '"%%%d$s" ' $((10 * $j + $k + 1))
+  done
+  printf "\n"
+done
+
+printf '"%%%d$s",\n' $(($n_args + 1))
+
+for ((j = 0; j < $n_args / 10; j++)); do
+  for ((k = 0; k < 10; k++)); do
+    printf '"a", '
+  done
+  printf "  /* %4d */\n" $((10 * $j + $k))
+done
+
+printf '"\\n");'
+
+
+cat <<'EOF'
+
+  return 0;
+}
+#pragma GCC pop_options
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+EOF