From 471fe3b7c941fd194a1399c4f24d6bfe9c97c150 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 15 Sep 2010 13:38:29 -0600
Subject: [PATCH] strnlen: add tests

* modules/strnlen-tests: New file.
* tests/test-strnlen.c: Likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 ChangeLog             |  6 +++++
 modules/strnlen-tests | 20 +++++++++++++++
 tests/test-strnlen.c  | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 modules/strnlen-tests
 create mode 100644 tests/test-strnlen.c

diff --git a/ChangeLog b/ChangeLog
index 4369728b8..097e499c0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-09-15  Eric Blake  <eblake@redhat.com>
+
+	strnlen: add tests
+	* modules/strnlen-tests: New file.
+	* tests/test-strnlen.c: Likewise.
+
 2010-09-14  Bruno Haible  <bruno@clisp.org>
 
 	unistr/base: Avoid link errors when module 'libunistring' is also used.
diff --git a/modules/strnlen-tests b/modules/strnlen-tests
new file mode 100644
index 000000000..31a36cf6c
--- /dev/null
+++ b/modules/strnlen-tests
@@ -0,0 +1,20 @@
+Files:
+tests/test-strnlen.c
+tests/zerosize-ptr.h
+tests/signature.h
+tests/macros.h
+m4/mmap-anon.m4
+
+Depends-on:
+extensions
+getpagesize
+
+configure.ac:
+dnl Check for prerequisites for memory fence checks.
+gl_FUNC_MMAP_ANON
+AC_CHECK_HEADERS_ONCE([sys/mman.h])
+AC_CHECK_FUNCS_ONCE([mprotect])
+
+Makefile.am:
+TESTS += test-strnlen
+check_PROGRAMS += test-strnlen
diff --git a/tests/test-strnlen.c b/tests/test-strnlen.c
new file mode 100644
index 000000000..e8d3696dc
--- /dev/null
+++ b/tests/test-strnlen.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2010 Free Software Foundation, Inc.
+ * Written by Eric Blake
+ *
+ * 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 <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <string.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (strnlen, size_t, (char const *, size_t));
+
+#include <stdlib.h>
+
+#include "zerosize-ptr.h"
+#include "macros.h"
+
+int
+main (void)
+{
+  size_t i;
+  char *page_boundary = (char *) zerosize_ptr ();
+  if (!page_boundary)
+    {
+      page_boundary = malloc (0x1000);
+      ASSERT (page_boundary);
+      page_boundary += 0x1000;
+    }
+
+  /* Basic behavior tests.  */
+  ASSERT (strnlen ("a", 0) == 0);
+  ASSERT (strnlen ("a", 1) == 1);
+  ASSERT (strnlen ("a", 2) == 1);
+  ASSERT (strnlen ("", 0x100000) == 0);
+
+  /* Memory fence and alignment testing.  */
+  for (i = 0; i < 512; i++)
+    {
+      char *start = page_boundary - i;
+      size_t j = i;
+      memset (start, 'x', i);
+      do
+        {
+          if (i != j)
+            {
+              start[j] = 0;
+              ASSERT (strnlen (start, i + j) == j);
+            }
+          ASSERT (strnlen (start, i) == j);
+          ASSERT (strnlen (start, j) == j);
+        }
+      while (j--);
+    }
+
+  return 0;
+}
-- 
2.11.0