Null terminate ./marketmaker events output

iguana/exchanges/mm.c

@@ -185,16 +185,22 @@ int main(int argc, const char * argv[])
     }
     else if ( argv[1] != 0 && strcmp(argv[1],"events") == 0 )
     {
-        int32_t len; void *ptr;
+        int32_t len,bufsize = 1000000; void *ptr; char *buf;
         if ( (IPC_ENDPOINT= nn_socket(AF_SP,NN_PAIR)) >= 0 )
         {
             if ( nn_connect(IPC_ENDPOINT,"ws://127.0.0.1:5555") >= 0 )
             {
+                buf = calloc(1,bufsize);
                 while ( 1 )
                 {
                     if ( (len= nn_recv(IPC_ENDPOINT,&ptr,NN_MSG,0)) > 0 )
                     {
-                        printf("%s\n",(char *)ptr);
+                        if ( len < bufsize )
+                        {
+                            memcpy(buf,ptr,len);
+                            buf[len] = 0;
+                            printf("%s\n",(char *)buf);
+                        }
                         nn_freemsg(ptr);
                     }
                 }