* Fix cmdline arguments parsing segfault in radiff2

* Do not build r_big api
  - It's incomplete, not used and is problematic to build

binr/radiff2/radiff2.c

@@ -158,7 +158,7 @@ int main(int argc, char **argv) {
 		}
 	}
 	
-	if (argc<3 || optind+2<argc)
+	if (argc<3 || optind+2>argc)
 		return show_help (R_FALSE);
 
 	file = argv[optind];

libr/include/r_util.h

@@ -402,6 +402,7 @@ R_API int r_range_get_n(RRange *rgs, int n, ut64 *from, ut64 *to);
 R_API RRange *r_range_inverse(RRange *rgs, ut64 from, ut64 to, int flags);
 R_API int r_range_overlap(ut64 a0, ut64 a1, ut64 b0, ut64 b1, int *d);
 
+#if 0
 /* big */
 #if HAVE_LIB_GMP
 #define RNumBig mpz_t
@@ -434,6 +435,7 @@ R_API void r_big_div(RNumBig *c, RNumBig *a, RNumBig *b);
 R_API void r_big_div_ut(RNumBig *a, RNumBig *b, ut32 c);
 R_API int r_big_divisible_ut(RNumBig *n, ut32 v);
 R_API void r_big_mod(RNumBig *c, RNumBig *a, RNumBig *b);
+#endif
 
 
 R_API RHashTable* r_hashtable_new(void);

libr/util/Makefile

@@ -4,6 +4,9 @@ NAME=r_util
 OBJ=mem.o pool.o num.o str.o re.o hex.o file.o alloca.o range.o log.o
 OBJ+=prof.o cache.o sys.o buf.o w32-sys.o base64.o
 OBJ+=list.o flist.o ht.o ht64.o mixed.o btree.o
+
+# DO NOT BUILD r_big api (not yet used and its buggy)
+ifeq (1,0)
 ifeq (${HAVE_LIB_GMP},1)
   OBJ+=big-gmp.o
 else
@@ -13,6 +16,7 @@ else
     OBJ+=big.o
   endif
 endif
+endif
 
 LDFLAGS+=${BN_LIBS}