Support usage as a shared library

.gitignore

@@ -1,4 +1,6 @@
 ssdv
 *.o
+*.lo
+*.so
 *.jpeg
 *.bin*

Makefile

@@ -3,18 +3,29 @@ CC=gcc
 CFLAGS=-g -O3 -Wall
 LDFLAGS=-g
 
-all: ssdv
+all: ssdv libssdv.so
 
 ssdv: main.o ssdv.o rs8.o ssdv.h rs8.h
 	$(CC) $(LDFLAGS) main.o ssdv.o rs8.o -o ssdv
 
+libssdv.so: ssdvutils.lo ssdv.lo rs8.lo ssdv.h rs8.h
+	$(CC) -shared $(LDFLAGS) ssdvutils.lo ssdv.lo rs8.lo -o libssdv.so
+
 .c.o:
 	$(CC) $(CFLAGS) -c $< -o $@
 
+%.lo : %.c
+	$(CC) $(CFLAGS) -fPIC -c $< -o $@
+
 install: all
 	mkdir -p ${DESTDIR}/usr/bin
+	mkdir -p ${DESTDIR}/usr/include/ssdv
 	install -m 755 ssdv ${DESTDIR}/usr/bin
+	install -m 755 libssdv.so ${DESTDIR}/usr/lib
+	install -m 644 ssdv.h ${DESTDIR}/usr/include/ssdv
+	install -m 644 ssdvutils.h ${DESTDIR}/usr/include/ssdv
+	install -m 644 rs8.h ${DESTDIR}/usr/include/ssdv
 
 clean:
-	rm -f *.o ssdv
+	rm -f *.o *.lo ssdv libssdv.so
 

ssdv.c

@@ -676,6 +676,7 @@ static char ssdv_have_marker(ssdv_t *s)
 		if(s->marker_len > TBL_LEN + HBUFF_LEN - s->stbl_len)
 		{
 			/* Not enough memory ... shouldn't happen! */
+            fprintf(stderr, "Error: Not enough memory\n");
 			return(SSDV_ERROR);
 		}