# -*- Makefile -*-

top_srcdir  := @top_srcdir@
srcdir      := @srcdir@
ksourcedir  := @ksourcedir@
prefix      := @prefix@
exec_prefix := @exec_prefix@
libdir      := @libdir@
libexecdir  := @libexecdir@
iptdir      := @iptdir@

CC             := @CC@
CCLD           := ${CC}
CFLAGS         := @CFLAGS@
LDFLAGS        := @LDFLAGS@
regular_CFLAGS := @regular_CFLAGS@
kinclude_CFLAGS := @kinclude_CFLAGS@

AM_CFLAGS      := ${regular_CFLAGS} -I${top_srcdir}/include ${kinclude_CFLAGS}
AM_DEPFLAGS     = -Wp,-MMD,$(@D)/.$(@F).d,-MT,$@

ifeq (${V},)
AM_LIBTOOL_SILENT = --silent
AM_VERBOSE_CC     = @echo "  CC      " $@;
AM_VERBOSE_CCLD   = @echo "  CCLD    " $@;
AM_VERBOSE_CXX    = @echo "  CXX     " $@;
AM_VERBOSE_CXXLD  = @echo "  CXXLD   " $@;
AM_VERBOSE_AR     = @echo "  AR      " $@;
AM_VERBOSE_GEN    = @echo "  GEN     " $@;
endif

#
#	Wildcard module list
#
pfx_all_mod := $(patsubst ${srcdir}/libxt_%.c,%,$(wildcard ${srcdir}/libxt_*.c))
pf4_all_mod := $(patsubst ${srcdir}/libipt_%.c,%,$(wildcard ${srcdir}/libipt_*.c))
pf6_all_mod := $(patsubst ${srcdir}/libip6t_%.c,%,$(wildcard ${srcdir}/libip6t_*.c))

#
#	Conditional module list
#
pfx_cond_mod := $(foreach i,$(wildcard ${srcdir}/.*-testx),$(shell KERNEL_DIR=${ksourcedir} ${i} provides))
pf4_cond_mod := $(foreach i,$(wildcard ${srcdir}/.*-test),$(shell KERNEL_DIR=${ksourcedir} ${i} provides))
pf6_cond_mod := $(foreach i,$(wildcard ${srcdir}/.*-test6),$(shell KERNEL_DIR=${ksourcedir} ${i} provides))

#
#	Conditional modules to build
#
pfx_bc_mod := $(foreach i,$(wildcard ${srcdir}/.*-testx),$(shell KERNEL_DIR=${ksourcedir} ${i}))
pf4_bc_mod := $(foreach i,$(wildcard ${srcdir}/.*-test),$(shell KERNEL_DIR=${ksourcedir} ${i}))
pf6_bc_mod := $(foreach i,$(wildcard ${srcdir}/.*-test6),$(shell KERNEL_DIR=${ksourcedir} ${i}))

#
#	Total list of modules to build
#
pfx_build_mod := $(filter-out ${pfx_cond_mod},${pfx_all_mod}) ${pfx_bc_mod}
pf4_build_mod := $(filter-out ${pf4_cond_mod},${pf4_all_mod}) ${pf4_bc_mod}
pf6_build_mod := $(filter-out ${pf6_cond_mod},${pf6_all_mod}) ${pf6_bc_mod}
pfx_objs      := $(patsubst %,libxt_%.o,${pfx_build_mod})
pf4_objs      := $(patsubst %,libipt_%.o,${pf4_build_mod})
pf6_objs      := $(patsubst %,libip6t_%.o,${pf6_build_mod})
pfx_solibs    := $(patsubst %,libxt_%.so,${pfx_build_mod})
pf4_solibs    := $(patsubst %,libipt_%.so,${pf4_build_mod})
pf6_solibs    := $(patsubst %,libip6t_%.so,${pf6_build_mod})


#
# Building blocks
#
targets := libext4.a libext6.a matches4.man matches6.man \
           targets4.man targets6.man
targets_install :=
@ENABLE_STATIC_TRUE@ libext4_objs := ${pfx_objs} ${pf4_objs}
@ENABLE_STATIC_TRUE@ libext6_objs := ${pfx_objs} ${pf6_objs}
@ENABLE_SHARED_TRUE@ targets += ${pfx_solibs} ${pf4_solibs} ${pf6_solibs}
@ENABLE_SHARED_TRUE@ targets_install += ${pfx_solibs} ${pf4_solibs} ${pf6_solibs}

.SECONDARY:

.PHONY: all install clean distclean FORCE

all: ${targets}

install: ${targets_install}
	@mkdir -p "${DESTDIR}${iptdir}";
	install -pm0755 $^ "${DESTDIR}${iptdir}/";

clean:
	rm -f *.o *.oo *.so *.a {matches,targets}[46].man initext4.c initext6.c;

distclean: clean
	rm -f .*.d .*.dd;

init%.o: ${srcdir}/init%.c
	${AM_VERBOSE_CC} ${CC} ${AM_DEPFLAGS} ${AM_CFLAGS} -D_INIT=$*_init ${CFLAGS} -o $@ -c $<;

-include .*.d


#
#	Shared libraries
#
lib%.so: lib%.oo
	${AM_VERBOSE_CCLD} ${CCLD} ${AM_LDFLAGS} -shared ${LDFLAGS} -o $@ $<;

lib%.oo: ${srcdir}/lib%.c
	${AM_VERBOSE_CC} ${CC} ${AM_DEPFLAGS} ${AM_CFLAGS} -D_INIT=lib$*_init -DPIC -fPIC ${CFLAGS} -o $@ -c $<;


#
#	Static bits
#
#	If static building is disabled, libext*.a will still be generated,
#	but will be empty. This is good since we can do with less case
#	handling code in the Makefiles.
#
lib%.o: ${srcdir}/lib%.c
	${AM_VERBOSE_CC} ${CC} ${AM_DEPFLAGS} ${AM_CFLAGS} -DNO_SHARED_LIBS=1 -D_INIT=lib$*_init ${CFLAGS} -o $@ -c $<;

libext4.a: initext4.o ${libext4_objs}
	${AM_VERBOSE_AR} ${AR} crs $@ $^;

libext6.a: initext6.o ${libext6_objs}
	${AM_VERBOSE_AR} ${AR} crs $@ $^;

initext_func  := $(addprefix xt_,${pfx_build_mod}) $(addprefix ipt_,${pf4_build_mod})
initext6_func := $(addprefix xt_,${pfx_build_mod}) $(addprefix ip6t_,${pf6_build_mod})

.initext4.dd: FORCE
	@echo "${initext_func}" >$@.tmp; \
	cmp -s $@ $@.tmp || mv $@.tmp $@; \
	rm -f $@.tmp;

.initext6.dd: FORCE
	@echo "${initext6_func}" >$@.tmp; \
	cmp -s $@ $@.tmp || mv $@.tmp $@; \
	rm -f $@.tmp;

initext4.c: .initext4.dd
	${AM_VERBOSE_GEN}
	@( \
	echo "" >$@; \
	for i in ${initext_func}; do \
		echo "extern void lib$${i}_init(void);" >>$@; \
	done; \
	echo -en "void init_extensions(void)\n""{\n" >>$@; \
	for i in ${initext_func}; do \
		echo -e "\t""lib$${i}_init();" >>$@; \
	done; \
	echo "}" >>$@; \
	);

initext6.c: .initext6.dd
	${AM_VERBOSE_GEN}
	@( \
	echo "" >$@; \
	for i in ${initext6_func}; do \
		echo "extern void lib$${i}_init(void);" >>$@; \
	done; \
	echo -en "void init_extensions(void)\n""{\n" >>$@; \
	for i in ${initext6_func}; do \
		echo -e "\t""lib$${i}_init();" >>$@; \
	done; \
	echo "}" >>$@; \
	);

#
#	Manual pages
#
ex_matches = $(sort $(shell echo $(1) | grep -Eo '\b[a-z0-9]+\b'))
ex_targets = $(sort $(shell echo $(1) | grep -Eo '\b[A-Z0-9]+\b'))
man_run    = \
	${AM_VERBOSE_GEN} \
	for ext in $(1); do \
		f="${srcdir}/libxt_$$ext.man"; \
		if [ -f "$$f" ]; then \
			echo ".SS $$ext"; \
			cat "$$f"; \
			continue; \
		fi; \
		f="${srcdir}/libipt_$$ext.man"; \
		if [ -f "$$f" ]; then \
			echo ".SS $$ext"; \
			cat "$$f"; \
			continue; \
		fi; \
		f="${srcdir}/libip6t_$$ext.man"; \
		if [ -f "$$f" ]; then \
			echo ".SS $$ext"; \
			cat "$$f"; \
			continue; \
		fi; \
	done >$@;

matches4.man: .initext4.dd $(wildcard ${srcdir}/lib*.man)
	$(call man_run,$(call ex_matches,${pfx_build_mod} ${pf4_build_mod}))

matches6.man: .initext6.dd $(wildcard ${srcdir}/lib*.man)
	$(call man_run,$(call ex_matches,${pfx_build_mod} ${pf6_build_mod}))

targets4.man: .initext4.dd $(wildcard ${srcdir}/lib*.man)
	$(call man_run,$(call ex_targets,${pfx_build_mod} ${pf4_build_mod}))

targets6.man: .initext6.dd $(wildcard ${srcdir}/lib*.man)
	$(call man_run,$(call ex_targets,${pfx_build_mod} ${pf6_build_mod}))