From 7a9eea94ee1f18fa81ad4875b5b462c96b615251 Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Tue, 1 Aug 2017 20:59:48 +0000
Subject: [PATCH] tests: add test_printpath function to libtests

* tests/test_ucopy.h (test_printpath): New prototype.
* tests/test_printpath.c: New file.
* tests/Makefile.am (libtests_a_SOURCES): Add it.
---
 tests/Makefile.am      |   1 +
 tests/test_printpath.c | 110 +++++++++++++++++++++++++++++++++++++++++
 tests/test_ucopy.h     |   3 ++
 3 files changed, 114 insertions(+)
 create mode 100644 tests/test_printpath.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index dd716519..28510747 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -65,6 +65,7 @@ libtests_a_SOURCES = \
 	tail_alloc.c \
 	test_netlink.h \
 	test_nlattr.h \
+	test_printpath.c \
 	test_ucopy.c \
 	test_ucopy.h \
 	tests.h \
diff --git a/tests/test_printpath.c b/tests/test_printpath.c
new file mode 100644
index 00000000..5f482f25
--- /dev/null
+++ b/tests/test_printpath.c
@@ -0,0 +1,110 @@
+/*
+ * Test printpath/umovestr.
+ *
+ * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+#include "test_ucopy.h"
+
+static void
+test_printpath_at(char *const p, const unsigned int test_max)
+{
+	/*
+	 *       /
+	 *      /.
+	 *     /..
+	 *    /...
+	 *   /../.
+	 *  /../..
+	 * /../../
+	 */
+
+	char *const eop = p + (test_max - 1);
+	*eop = '\0';
+	unsigned int i;
+	for (i = 1; i < test_max; ++i) {
+		const unsigned int i_1 = i - 1;
+		memmove(eop - i, eop - i_1, i_1);
+		eop[-1] = "/.."[i_1 % 3];
+		if (chdir(eop - i))
+			perror_msg_and_fail("chdir");
+		printf("chdir(\"%s\") = 0\n", eop - i);
+	}
+}
+
+static void
+test_efault(const unsigned int test_max)
+{
+	char *p = tail_alloc(test_max);
+	const char *const efault = p + test_max;
+	memset(p, '/', test_max);
+
+	for (; p <= efault; ++p) {
+		if (p <= efault - PATH_MAX)
+			continue;
+		printf("chdir(%p) = %s\n", p, sprintrc(chdir(p)));
+	}
+}
+
+static void
+test_enametoolong(void)
+{
+	char *p = tail_alloc(PATH_MAX);
+	memset(p, '/', PATH_MAX);
+
+	printf("chdir(\"%.*s\"...) = %s\n",
+	       PATH_MAX - 1, p, sprintrc(chdir(p)));
+}
+
+void
+test_printpath(const unsigned int test_max)
+{
+	/*
+	 * /../..|
+	 * /../.|.
+	 * /../|..
+	 * /..|/..
+	 * /.|./..
+	 * /|../..
+	 * |/../..
+	 */
+	const unsigned int page_size = get_page_size();
+	char *p = tail_alloc(test_max + page_size);
+	unsigned int i;
+	for (i = 1; i < sizeof(long); ++i)
+		test_printpath_at(p + i, test_max);
+	for (i = 0; i < sizeof(long); ++i)
+		test_printpath_at(p + page_size - i, test_max);
+	test_efault(test_max);
+	test_enametoolong();
+}
diff --git a/tests/test_ucopy.h b/tests/test_ucopy.h
index c2a70200..4003bbb0 100644
--- a/tests/test_ucopy.h
+++ b/tests/test_ucopy.h
@@ -5,3 +5,6 @@ test_process_vm_readv(void);
 
 extern bool
 test_ptrace_peekdata(void);
+
+extern void
+test_printpath(unsigned int test_max_size);
-- 
2.40.0