KPath: Fixed Normalize() return code, changed Leaf().

* Normalize() now returns the error code that vfs_normalize_path()
  returns.
* Leaf() now returns "" instead of "/" for the root. It's not used
  outside of KPath.
* Adapted RemoveLeaf() to deal with this correctly.
* "KPath = string" no longer changes the buffer size.
* Added missing operator tests for =, ==, and !=.

src/system/kernel/fs/KPath.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright 2004-2008, Ingo Weinhold, [email protected].
+ * Copyright 2008-2017, Axel Dörfler, [email protected].
  * Distributed under the terms of the MIT License.
  */
 
@@ -106,7 +107,7 @@ KPath::Adopt(KPath& other)
 status_t
 KPath::InitCheck() const
 {
-	return fBuffer ? B_OK : B_NO_MEMORY;
+	return fBuffer != NULL ? B_OK : B_NO_MEMORY;
 }
 
 
@@ -203,14 +204,11 @@ KPath::Leaf() const
 	if (fBuffer == NULL)
 		return NULL;
 
-	// only "/" has trailing slashes -- then we have to return the complete
-	// buffer, as we have to do in case there are no slashes at all
-	if (fPathLength != 1 || fBuffer[0] != '/') {
-		for (int32 i = fPathLength - 1; i >= 0; i--) {
-			if (fBuffer[i] == '/')
-				return fBuffer + i + 1;
-		}
+	for (int32 i = fPathLength - 1; i >= 0; i--) {
+		if (fBuffer[i] == '/')
+			return fBuffer + i + 1;
 	}
+
 	return fBuffer;
 }
 
@@ -242,7 +240,7 @@ KPath::RemoveLeaf()
 {
 	// get the leaf -- bail out, if not initialized or only the "/" is left
 	const char* leaf = Leaf();
-	if (leaf == NULL || leaf == fBuffer)
+	if (leaf == NULL || leaf == fBuffer || leaf[0] == '\0')
 		return false;
 
 	// chop off the leaf
@@ -305,6 +303,7 @@ KPath::Normalize(bool traverseLeafLink)
 		// it completely to avoid weird problems.
 		fBuffer[0] = '\0';
 		fPathLength = 0;
+		return error;
 	}
 
 	fPathLength = strlen(fBuffer);
@@ -323,7 +322,7 @@ KPath::operator=(const KPath& other)
 KPath&
 KPath::operator=(const char* path)
 {
-	SetTo(path);
+	SetPath(path);
 	return *this;
 }
 
@@ -331,7 +330,7 @@ KPath::operator=(const char* path)
 bool
 KPath::operator==(const KPath& other) const
 {
-	if (!fBuffer)
+	if (fBuffer == NULL)
 		return !other.fBuffer;
 
 	return other.fBuffer
@@ -343,7 +342,7 @@ KPath::operator==(const KPath& other) const
 bool
 KPath::operator==(const char* path) const
 {
-	if (!fBuffer)
+	if (fBuffer == NULL)
 		return (!path);
 
 	return path && strcmp(fBuffer, path) == 0;

src/tests/system/kernel/fs/KPathTest.cpp

@@ -97,8 +97,7 @@ KPathTest::TestLeaf()
 
 	path.SetTo("/");
 	CPPUNIT_ASSERT(strcmp(path.Path(), "/") == 0);
-//	CPPUNIT_ASSERT(path.Leaf() == NULL);
-// TODO: why '/'?
+	CPPUNIT_ASSERT(strcmp(path.Leaf(), "") == 0);
 
 	path.SetTo("a/b");
 	CPPUNIT_ASSERT(strcmp(path.Path(), "a/b") == 0);
@@ -150,19 +149,30 @@ KPathTest::TestRemoveLeaf()
 
 	path.SetTo("a//b/c");
 	removed = path.RemoveLeaf();
-	CPPUNIT_ASSERT(removed);
+	CPPUNIT_ASSERT_MESSAGE("1. removed", removed);
 	CPPUNIT_ASSERT(strcmp(path.Path(), "a//b") == 0);
 	CPPUNIT_ASSERT(path.Length() == 4);
 
 	removed = path.RemoveLeaf();
-	CPPUNIT_ASSERT(removed);
+	CPPUNIT_ASSERT_MESSAGE("2. removed", removed);
 	CPPUNIT_ASSERT(strcmp(path.Path(), "a") == 0);
 	CPPUNIT_ASSERT(path.Length() == 1);
 
 	removed = path.RemoveLeaf();
-	CPPUNIT_ASSERT(!removed);
+	CPPUNIT_ASSERT_MESSAGE("3. !removed", !removed);
 	CPPUNIT_ASSERT(strcmp(path.Path(), "a") == 0);
 	CPPUNIT_ASSERT(path.Length() == 1);
+
+	path.SetTo("/a");
+	removed = path.RemoveLeaf();
+	CPPUNIT_ASSERT_MESSAGE("4. removed", removed);
+	CPPUNIT_ASSERT(strcmp(path.Path(), "/") == 0);
+	CPPUNIT_ASSERT(path.Length() == 1);
+
+	removed = path.RemoveLeaf();
+	CPPUNIT_ASSERT_MESSAGE("5. !removed", !removed);
+	CPPUNIT_ASSERT(strcmp(path.Path(), "/") == 0);
+	CPPUNIT_ASSERT(path.Length() == 1);
 }
 
 
@@ -218,9 +228,53 @@ KPathTest::TestNormalize()
 }
 
 
+void
+KPathTest::TestAssign()
+{
+	KPath one("first", false, 10);
+	CPPUNIT_ASSERT(one.Length() == 5);
+	KPath two("second", false, 20);
+
+	two = one;
+	CPPUNIT_ASSERT(strcmp(two.Path(), one.Path()) == 0);
+	CPPUNIT_ASSERT(two.Path() != one.Path());
+	CPPUNIT_ASSERT(two.BufferSize() == one.BufferSize());
+	CPPUNIT_ASSERT(two.Length() == one.Length());
+
+	one = "/whatever";
+	CPPUNIT_ASSERT(one.Length() == 9);
+	CPPUNIT_ASSERT(one.BufferSize() == two.BufferSize());
+	CPPUNIT_ASSERT(strcmp(one.Path(), "/whatever") == 0);
+}
+
+
 void
 KPathTest::TestEquals()
 {
+	KPath a("one");
+	KPath b("two");
+	CPPUNIT_ASSERT_MESSAGE("1.", !(a == b));
+
+	b = a;
+	CPPUNIT_ASSERT_MESSAGE("2.", a == b);
+
+	b = "ones";
+	CPPUNIT_ASSERT_MESSAGE("3.", !(a == b));
+}
+
+
+void
+KPathTest::TestNotEquals()
+{
+	KPath a("one");
+	KPath b("two");
+	CPPUNIT_ASSERT_MESSAGE("1.", a != b);
+
+	b = a;
+	CPPUNIT_ASSERT_MESSAGE("2.", !(a != b));
+
+	b = "ones";
+	CPPUNIT_ASSERT_MESSAGE("3.", a != b);
 }
 
 
@@ -243,8 +297,12 @@ KPathTest::AddTests(BTestSuite& parent)
 		"KPathTest::TestDetachBuffer", &KPathTest::TestDetachBuffer));
 	suite.addTest(new CppUnit::TestCaller<KPathTest>(
 		"KPathTest::TestNormalize", &KPathTest::TestNormalize));
+	suite.addTest(new CppUnit::TestCaller<KPathTest>(
+		"KPathTest::TestAssign", &KPathTest::TestAssign));
 	suite.addTest(new CppUnit::TestCaller<KPathTest>(
 		"KPathTest::TestEquals", &KPathTest::TestEquals));
+	suite.addTest(new CppUnit::TestCaller<KPathTest>(
+		"KPathTest::TestNotEquals", &KPathTest::TestNotEquals));
 
 	parent.addTest("KPathTest", &suite);
 }

src/tests/system/kernel/fs/KPathTest.h

@@ -22,7 +22,9 @@ public:
 			void				TestAdopt();
 			void				TestDetachBuffer();
 			void				TestNormalize();
+			void				TestAssign();
 			void				TestEquals();
+			void				TestNotEquals();
 
 	static	void				AddTests(BTestSuite& suite);
 };