1 files changed, 89 insertions, 0 deletions
diff --git a/src/common/linux/safe_readlink_unittest.cc b/src/common/linux/safe_readlink_unittest.cc
new file mode 100644
index 00000000..191fb9f1
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+++ b/src/common/linux/safe_readlink_unittest.cc
@@ -0,0 +1,89 @@
+// Copyright (c) 2011, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "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 COPYRIGHT
+// OWNER OR CONTRIBUTORS 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.
+
+// safe_readlink_unittest.cc: Unit tests for google_breakpad::SafeReadLink.
+
+#include "breakpad_googletest_includes.h"
+#include "common/linux/safe_readlink.h"
+
+using google_breakpad::SafeReadLink;
+
+TEST(SafeReadLinkTest, ZeroBufferSize) {
+  char buffer[1];
+  EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 0));
+}
+
+TEST(SafeReadLinkTest, BufferSizeTooSmall) {
+  char buffer[1];
+  EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 1));
+}
+
+TEST(SafeReadLinkTest, BoundaryBufferSize) {
+  char buffer[PATH_MAX];
+  EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer, sizeof(buffer)));
+  size_t path_length = strlen(buffer);
+  EXPECT_LT(0, path_length);
+  EXPECT_GT(sizeof(buffer), path_length);
+
+  // Buffer size equals to the expected path length plus 1 for the NULL byte.
+  char buffer2[PATH_MAX];
+  EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2, path_length + 1));
+  EXPECT_EQ(path_length, strlen(buffer2));
+  EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
+
+  // Buffer size equals to the expected path length.
+  EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, path_length));
+}
+
+TEST(SafeReadLinkTest, NonexistentPath) {
+  char buffer[PATH_MAX];
+  EXPECT_FALSE(SafeReadLink("nonexistent_path", buffer, sizeof(buffer)));
+}
+
+TEST(SafeReadLinkTest, NonSymbolicLinkPath) {
+  char actual_path[PATH_MAX];
+  EXPECT_TRUE(SafeReadLink("/proc/self/exe", actual_path, sizeof(actual_path)));
+
+  char buffer[PATH_MAX];
+  EXPECT_FALSE(SafeReadLink(actual_path, buffer, sizeof(buffer)));
+}
+
+TEST(SafeReadLinkTest, DeduceBufferSizeFromCharArray) {
+  char buffer[PATH_MAX];
+  char* buffer_pointer = buffer;
+  EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer_pointer, sizeof(buffer)));
+  size_t path_length = strlen(buffer);
+
+  // Use the template version of SafeReadLink to deduce the buffer size
+  // from the char array.
+  char buffer2[PATH_MAX];
+  EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2));
+  EXPECT_EQ(path_length, strlen(buffer2));
+  EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
+}