CC := gcc
CFLAGS = -std=c99 -Wall -Wextra -Wpedantic -g

SRCD := src
OBJD := obj
BIND := bin

FILES = $(shell find $(SRCD)/$(SUBD) -type f)

CSRCS = $(filter %.c, $(FILES))
HSRCS = $(filter %.h, $(FILES))
COBJS = $(CSRCS:$(SRCD)/%.c=$(OBJD)/%.o)

MODULE_TARGET := keylogger.ko
KERNEL_NAME := kernel-$(shell uname -r)
INITFS_NAME := initramfs.img

export

all: daemon client module tests vm

clean:
	rm -rf $(BIND)
	rm -rf $(OBJD)

daemon client module tests libs:
	$(eval TARGET := $($(shell echo $@ | tr 'a-z' 'A-Z')_TARGET))
	$(MAKE) $(BIND)/$(if $(TARGET),$(TARGET),$@) SUBD=$@

# generic link
$(BIND)/%: $(COBJS) $(HSRCS)
	mkdir -p $(dir $@)
	$(CC) $(CFLAGS) $(SFLAGS) $^ -o $@

# generic bulid
$(OBJD)/%.o: $(SRCD)/%.c
	mkdir -p $(dir $@)
	$(CC) $(CFLAGS) $(SFLAGS) -c $^ -o $@


# build a module
$(BIND)/%.ko: $(CSRCS) $(HSRCS)
	mkdir -p $(dir $@); mkdir -p $(OBJD)/$(SUBD)
	make -C $(SRCD)/$(SUBD) name=$(@:$(BIND)/%.ko=%)
	mv $(SRCD)/$(SUBD)/*.o $(OBJD)/$(SUBD)
	mv $(SRCD)/$(SUBD)/*.ko $@
	make -C $(SRCD)/$(SUBD) clean

# copy and build the testing files and other shared files (no .c files)
$(BIND)/tests: libs
$(BIND)/tests $(BIND)/libs: $(FILES) $(CSRCS:$(SRCD)/%.c=$(BIND)/%)
	mkdir -p $(BIND)/$(SUBD)
	find $(SRCD)/$(SUBD) -type f ! -name '*.c' -exec cp {} $(BIND)/$(SUBD) \;


# VM things
vm: vm.sh $(BIND)/$(INITFS_NAME) $(BIND)/$(KERNEL_NAME)
	./vm.sh run
$(BIND)/$(INITFS_NAME): $(SRCD)/initramfs-init.sh module
	./vm.sh initramfs $@ $^
$(BIND)/$(KERNEL_NAME):
	./vm.sh kernel $@