Added source files initialization.

Now source files handling is delegated to functions defined
in `sourcefs.c` file. By encapsulating methods for managing
the underlying source files structure we ensure that all
code changes to the source file protection strategy will be
localized to `sourcefs.c` file.

Also changed Makefile to use more sane way of handling
options and build flags.

Makefile

@@ -1,24 +1,35 @@
+SHELL=/bin/bash
 
 CC := gcc
 CXX := g++
 
-O_LDFLAGS := 
-O_CFLAGS := -O3
+CFLAGS := -I/usr/include/fuse -D_FILE_OFFSET_BITS=64
+LDFLAGS := -lfuse3 -pthread
 
-O_LDFLAGS_DEBUG := 
-O_CFLAGS_DEBUG := -pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 -Wswitch-default -Wundef -Wno-unused -Weffc++
-
-I_LDFLAGS := -lfuse3 -pthread
-I_CFLAGS := -I/usr/include/fuse -D_FILE_OFFSET_BITS=64
+ifdef DEBUG
+	CFLAGS += -O0 -pedantic -Wall -Wextra -Wcast-align \
+						-Wcast-qual -Wdisabled-optimization -Wformat=2 \
+						-Winit-self -Wlogical-op -Wmissing-declarations \
+						-Wmissing-include-dirs -Wredundant-decls -Wshadow \
+						-Wsign-conversion -Wstrict-overflow=5 \
+						-Wswitch-default -Wundef -Wno-unused
+	LDFLAGS += 
+else
+	CFLAGS += -O3
+	LDFLAGS +=
+endif
 
 SOURCES_DIR := ./sources
 BUILD_DIR := ./build
 
-build: $(SOURCES_DIR)/main.cpp
-	$(CC) $(O_CFLAGS) $(I_CFLAGS) $(SOURCES_DIR)/main.cpp $(O_LDFLAGS) $(I_LDFLAGS) -o $(BUILD_DIR)/icfs
+build: $(BUILD_DIR)/main.o $(BUILD_DIR)/sourcefs.o
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $(BUILD_DIR)/icfs
 
-dev-build: $(SOURCES_DIR)/main.cpp
-	$(CC) $(O_CFLAGS_DEBUG) $(I_CFLAGS) $(SOURCES_DIR)/main.cpp $(O_LDFLAGS_DEBUG) $(I_LDFLAGS) -o $(BUILD_DIR)/icfs
+$(BUILD_DIR)/main.o: $(SOURCES_DIR)/main.c
+	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $(BUILD_DIR)/main.o
+
+$(BUILD_DIR)/sourcefs.o: $(SOURCES_DIR)/sourcefs.c $(SOURCES_DIR)/sourcefs.h
+	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
 
 clean:
-	rm $(BUILD_DIR)/icfs
+	rm $(BUILD_DIR)/*