Fix memory bugs in shift left.

Arena.h

@@ -188,7 +188,12 @@ private:
 /// Write an Arena out to the output stream.
 ///
 /// The resulting output looks something like
+/// ```
 /// Arena<allocated>@0x7fff91dfad70,store<128B>@0x0055d6c5881ec0.
+///         ^          ^                    ^     ^
+///         |          +- base memory       |     +- store memory
+///         +- arena type                   +- arena size
+/// ```
 ///
 /// \param os
 /// \param arena

Buffer.cc

@@ -180,8 +180,10 @@ Buffer::Resize(size_t newCapacity)
 		memcpy(newContents, this->contents, this->length);
 	}
 
-	delete this->contents;
-	this->contents = nullptr;
+	if (this->length > 0) {
+		delete[] this->contents;
+		this->contents = nullptr;
+	}
 	this->contents = newContents;
 	this->capacity = newCapacity;
 }
@@ -223,7 +225,7 @@ Buffer::Reclaim()
 		return;
 	}
 
-	delete this->contents;
+	delete[] this->contents;
 	this->contents = nullptr;
 	this->capacity = 0;
 }
@@ -289,6 +291,7 @@ Buffer::shiftRight(size_t offset, size_t delta)
 
 	if (this->length == 0) return 0;
 
+
 	memmove(this->contents + (offset + delta), this->contents + offset,
 		this->length);
 	return resized;
@@ -298,8 +301,21 @@ Buffer::shiftRight(size_t offset, size_t delta)
 bool
 Buffer::shiftLeft(size_t offset, size_t delta)
 {
-	memmove(this->contents + offset, this->contents + (offset + delta),
-		this->length);
+	if (delta == 0) {
+		return false;
+	}
+
+	if ((offset+delta) > this->length) {
+		abort();
+	}
+
+	for (auto i = offset; i <= (this->length-delta); i++) {
+		this->contents[i] = this->contents[i+delta];
+	}
+
+	for (auto i = this->length-delta; i < this->length; i++) {
+		this->contents[i] = 0;
+	}
 
 	if (this->AutoTrimIsEnabled()) {
 		return this->Trim() != 0;

CMakeLists.txt

@@ -4,6 +4,8 @@ project(klib LANGUAGES CXX
         DESCRIPTION "Kyle's C++ library")
 
 set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_VERBOSE_MAKEFILES TRUE)
+set(VERBOSE YES)
 
 if (MSVC)
     add_compile_options("/W4" "$<$<CONFIG:RELEASE>:/O2>")

bufferTest.cc

@@ -12,19 +12,27 @@ main(int argc, char *argv[])
 	(void) argv;
 
 	Buffer buffer("hlo, world");
+	Buffer helloWorld("hello, world!");
+	Buffer goodbyeWorld("goodbye, world");
+	Buffer goodbyeCruelWorld("goodbye, cruel world");
 
 	std::cout << buffer << std::endl;
 
 	buffer.Insert(1, (uint8_t *) "el", 2);
 	buffer.Append('!');
+	assert(buffer == helloWorld);
 
 	std::cout << buffer << std::endl;
 
 	buffer.Remove(buffer.Length() - 1);
+	std::cout << buffer << std::endl;
 	buffer.Remove(0, 5);
+	std::cout << buffer << std::endl;
 	buffer.Insert(0, 'g');
+	std::cout << buffer << std::endl;
 	buffer.Insert(1, (uint8_t *) "oodbye", 6);
 	std::cout << buffer << std::endl;
+	assert(buffer == goodbyeWorld);
 	buffer.Insert(9, (uint8_t *)"cruel ", 6);
 
 	std::cout << buffer << std::endl;

klib.h

@@ -20,20 +20,39 @@
 /// ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 /// SOFTWARE.
 ///
-/// \mainpage klib documentation
-/// Hello, world.
-///
-/// \section Introduction
-///
-/// This is a collection of data structures and subroutines that I find
-/// useful in building things.
 
 #ifndef KLIB_KLIB_H
 #define KLIB_KLIB_H
 
 
 /// klib is the top-level namespace containing all the code in this library.
-namespace klib {}
+namespace klib {
+
+/// \mainpage klib documentation
+///
+/// \section Introduction
+///
+/// This is a collection of data structures and subroutines that I find
+/// useful in building things.
+///
+/// This library arose from two main use cases.
+///
+/// \subsection The modem
+///
+/// On the one hand, I was building a wireless modem for some Z80 computers I
+/// have. I needed to be able to store a phonebook of SSIDs and WPA keys, as
+/// well as short names to host:port descriptors. I had a limited amount of of
+/// persistent NVRAM storage and no SD card or other removeable media, so
+/// typical desktop-oriented serialization mechanisms weren't going to really
+/// work well. Furthermore, when working with microcontrollers, I prefer not to
+/// dynamically allocate memory as much as possible. This led to building out
+/// Arena, TLV::Record to store the records, and finally Dictionary to make use
+/// of both of them.
+///
+///
+
+
+}
 
 
 #endif // KLIB_KLIB_H