Add a file for shared functions

New common.[hc] files where shared functions between surf and
webkitextension will be put. First addition is die().

Makefile

@@ -4,9 +4,9 @@
 
 include config.mk
 
-SRC = surf.c
+SRC = surf.c common.c
 OBJ = $(SRC:.c=.o)
-LIBSRC = libsurf-webext.c
+LIBSRC = libsurf-webext.c common.c
 LIBOBJ = $(LIBSRC:.c=.lo)
 
 all: options libsurf-webext.la surf
@@ -38,7 +38,7 @@ config.h:
 libsurf-webext.la: $(LIBOBJ)
 	@echo libtool link $@
 	@$(LIBTOOL) --mode link --tag CC $(CC) $(LIBLDFLAGS) -o $@ \
-	    $(LIBOBJ) -rpath $(DESTDIR)$(LIBPREFIX)
+	    $(LIBOBJ) $(LIB) -rpath $(DESTDIR)$(LIBPREFIX)
 
 surf: $(OBJ)
 	@echo CC -o $@

common.c

@@ -0,0 +1,15 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void
+die(const char *errstr, ...)
+{
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(1);
+}
+

common.h

@@ -0,0 +1,3 @@
+#define MSGBUFSZ 32
+
+void die(char *, ...);

libsurf-webext.c

@@ -8,9 +8,9 @@
 #include <webkitdom/webkitdom.h>
 #include <webkitdom/WebKitDOMDOMWindowUnstable.h>
 
-#define LENGTH(x)   (sizeof(x) / sizeof(x[0]))
+#include "common.h"
 
-#define MSGBUFSZ 32
+#define LENGTH(x)   (sizeof(x) / sizeof(x[0]))
 
 typedef struct Page {
 	guint64 id;

surf.c

@@ -30,10 +30,10 @@
 #include <glib.h>
 
 #include "arg.h"
+#include "common.h"
 
 #define LENGTH(x)               (sizeof(x) / sizeof(x[0]))
 #define CLEANMASK(mask)         (mask & (MODKEY|GDK_SHIFT_MASK))
-#define MSGBUFSZ 32
 
 enum { AtomFind, AtomGo, AtomUri, AtomLast };
 
@@ -142,7 +142,6 @@ typedef struct {
 
 /* Surf */
 static void usage(void);
-static void die(const char *errstr, ...);
 static void setup(void);
 static void sigchld(int unused);
 static void sighup(int unused);
@@ -310,17 +309,6 @@ usage(void)
 	    "[-r scriptfile] [-u useragent] [-z zoomlevel] [uri]\n");
 }
 
-void
-die(const char *errstr, ...)
-{
-	va_list ap;
-
-	va_start(ap, errstr);
-	vfprintf(stderr, errstr, ap);
-	va_end(ap);
-	exit(1);
-}
-
 void
 setup(void)
 {