Fix loop issue after 65536 pings (reported by Peter Folk and GBert, #12), Minimum ping data size is now 0

ChangeLog

@@ -1,3 +1,7 @@
+UNRELEASED
+  * Fix loop issue after 65536 pings (reported by Peter Folk and GBert, #12)
+  * Minimum ping data size is now 0
+
 2013-05-22  David Schweikert  <david@schweikert.ch>
   * Version 3.5
   * Fix sprint_tm buffer size crash (reported by Japheth Cleaver)

src/fping.c

@@ -526,7 +526,9 @@ int main( int argc, char **argv )
             break;
 
         case 'b':
-            if( !( ping_data_size = ( unsigned int )atoi( optarg ) ) )
+            errno = 0;
+            ping_data_size = (unsigned int) strtol(optarg, (char **)NULL, 10);
+            if( errno )
                 usage(1);
             
             break;