1 files changed, 73 insertions, 0 deletions
diff --git a/src/grep/gnulib-tests/test-c-stack.c b/src/grep/gnulib-tests/test-c-stack.c
new file mode 100644
index 0000000..2c5a49a
--- /dev/null
+++ b/src/grep/gnulib-tests/test-c-stack.c
@@ -0,0 +1,73 @@
+/* Test of c-stack module.
+   Copyright (C) 2002, 2004, 2006, 2008-2021 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "c-stack.h"
+
+#include "exitfail.h"
+#include <stdio.h>
+#if HAVE_SETRLIMIT
+/* At least FreeBSD 5.0 needs extra headers before <sys/resource.h>
+   will compile.  */
+# include <sys/types.h>
+# include <sys/time.h>
+# include <sys/resource.h>
+#endif
+
+#include "macros.h"
+
+static volatile int *
+recurse_1 (volatile int n, volatile int *p)
+{
+  if (n >= 0)
+    *recurse_1 (n + 1, p) += n;
+  return p;
+}
+
+static int
+recurse (volatile int n)
+{
+  int sum = 0;
+  return *recurse_1 (n, &sum);
+}
+
+int
+main (int argc, char **argv)
+{
+#if HAVE_SETRLIMIT && defined RLIMIT_STACK
+  /* Before starting the endless recursion, try to be friendly to the
+     user's machine.  On some Linux 2.2.x systems, there is no stack
+     limit for user processes at all.  We don't want to kill such
+     systems.  */
+  struct rlimit rl;
+  rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */
+  setrlimit (RLIMIT_STACK, &rl);
+#endif
+
+  if (c_stack_action (NULL) == 0)
+    {
+      if (1 < argc)
+        {
+          exit_failure = 77;
+          ++*argv[argc]; /* Intentionally dereference NULL.  */
+        }
+      return recurse (0);
+    }
+  fputs ("skipping test: ", stderr);
+  perror ("c_stack_action");
+  return 77;
+}