util.dbuffer: Add efficient shortcuts for discard() in certain cases
If the buffer is already empty, nothing to do. If we're throwing away the
whole buffer, we can just empty it and avoid read_chunk() (which in turn
may collapse()). These shortcuts are much more efficient.
include ../config.unix
CFLAGS+=-I$(LUA_INCDIR)
INSTALL_DATA=install -m644
TARGET?=../util/
ALL=encodings.so hashes.so net.so pposix.so signal.so table.so \
ringbuffer.so time.so poll.so compat.so strbitop.so \
struct.so crypto.so
ifdef RANDOM
ALL+=crand.so
endif
.PHONY: all install clean
.SUFFIXES: .c .o .so
all: $(ALL)
install: $(ALL)
$(INSTALL_DATA) $? $(TARGET)
clean:
rm -f $(ALL) $(patsubst %.so,%.o,$(ALL))
encodings.o: CFLAGS+=$(IDNA_FLAGS)
encodings.so: LDLIBS+=$(IDNA_LIBS)
crypto.so hashes.so: LDLIBS+=$(OPENSSL_LIBS)
crand.o: CFLAGS+=-DWITH_$(RANDOM)
crand.so: LDLIBS+=$(RANDOM_LIBS)
%.so: %.o
$(LD) $(LDFLAGS) -o $@ $^ $(LDLIBS)