include config.mk

.POSIX:
.SUFFIXES: .c .o

HDR = util.h arg.h ubase.h
LIB = \
	$(OS)/dmesg.o       \
	$(OS)/grabmntinfo.o \
	$(OS)/umount.o      \
	util/eprintf.o      \
	util/estrtol.o

SRC = \
	df.c                \
	dmesg.c             \
	umount.c            \
	stat.c

ifeq ($(OS),linux)
SRC += \
	halt.c              \
	insmod.c            \
	lsmod.c             \
	mkswap.c            \
	reboot.c            \
	rmmod.c             \
	swapoff.c           \
	swapon.c            \
	unshare.c
endif

OBJ = $(SRC:.c=.o) $(LIB)
BIN = $(SRC:.c=)
MAN = $(SRC:.c=.1)

all: options binlib

options:
	@echo ubase build options:
	@echo "OS       = $(OS)"
	@echo "CFLAGS   = $(CFLAGS)"
	@echo "LDFLAGS  = $(LDFLAGS)"
	@echo "CC       = $(CC)"

binlib: util.a
	$(MAKE) bin

bin: $(BIN)

$(OBJ): util.h config.mk

.o:
	@echo LD $@
	@$(LD) -o $@ $< util.a $(LDFLAGS)

.c.o:
	@echo CC $<
	@$(CC) -c -o $@ $< $(CFLAGS)

util.a: $(LIB)
	@echo AR $@
	@$(AR) -r -c $@ $(LIB)
	@ranlib $@

install: all
	@echo installing executables to $(DESTDIR)$(PREFIX)/bin
	@mkdir -p $(DESTDIR)$(PREFIX)/bin
	@cp -f $(BIN) $(DESTDIR)$(PREFIX)/bin
	@cd $(DESTDIR)$(PREFIX)/bin && chmod 755 $(BIN)
	@echo installing manual pages to $(DESTDIR)$(MANPREFIX)/man1
	@mkdir -p $(DESTDIR)$(MANPREFIX)/man1
	@cp -f $(MAN) $(DESTDIR)$(MANPREFIX)/man1
	@cd $(DESTDIR)$(MANPREFIX)/man1 && chmod 644 $(MAN)

uninstall:
	@echo removing executables from $(DESTDIR)$(PREFIX)/bin
	@cd $(DESTDIR)$(PREFIX)/bin && rm -f $(BIN)
	@echo removing manual pages from $(DESTDIR)$(MANPREFIX)/man1
	@cd $(DESTDIR)$(MANPREFIX)/man1 && rm -f $(MAN)

dist: clean
	@echo creating dist tarball
	@mkdir -p ubase-$(VERSION)
	@cp -r LICENSE Makefile config.mk $(SRC) $(MAN) util $(HDR) ubase-$(VERSION)
	@tar -cf ubase-$(VERSION).tar ubase-$(VERSION)
	@gzip ubase-$(VERSION).tar
	@rm -rf ubase-$(VERSION)

ubase-box: $(SRC) util.a
	@echo creating box binary
	@mkdir -p build
	@cp $(HDR) build
	@for f in $(SRC); do sed "s/^main(/`basename $$f .c`_&/" < $$f > build/$$f; done
	@echo '#include <libgen.h>'  > build/$@.c
	@echo '#include <stdlib.h>' >> build/$@.c
	@echo '#include <string.h>' >> build/$@.c
	@echo '#include "util.h"'   >> build/$@.c
	@for f in $(SRC); do echo "int `basename $$f .c`_main(int, char **);" >> build/$@.c; done
	@echo 'int main(int argc, char *argv[]) { char *s = basename(argv[0]); if(0) ;' >> build/$@.c
	@for f in $(SRC); do echo "else if(!strcmp(s, \"`basename $$f .c`\")) `basename $$f .c`_main(argc, argv);" >> build/$@.c; done
	@printf 'else eprintf("%%s: unknown program\\n", s); return EXIT_SUCCESS; }\n' >> build/$@.c
	@echo LD $@
	@$(LD) -o $@ build/*.c util.a $(CFLAGS) $(LDFLAGS)
	@rm -r build

clean:
	@echo cleaning
	@rm -f $(BIN) $(OBJ) $(LIB) util.a ubase-box