check wether config file was empty

git-svn-id: https://svn.spreadspace.org/tcpproxy/trunk@29 e61f0598-a718-4e21-a8f0-0aadfa62ad6b

3 files changed, 22 insertions, 0 deletions

diff --git a/src/slist.c b/src/slist.c
index 8dd1963..24da141 100644
--- a/src/slist.c
+++ b/src/slist.c
@@ -115,3 +115,16 @@ void slist_clear(slist_t* lst)
   
   lst->first_ = NULL;
 }
+
+int slist_length(slist_t* lst)
+{
+  if(!lst || !lst->first_)
+    return 0;
+  
+  int len = 0;
+  slist_element_t* tmp;
+  for(tmp = lst->first_; tmp; tmp = tmp->next_)
+    len++;
+  
+  return len;
+}
diff --git a/src/slist.h b/src/slist.h
index 4812192..f036bf3 100644
--- a/src/slist.h
+++ b/src/slist.h
@@ -46,5 +46,6 @@ int slist_init(slist_t* lst, void (*delete_element)(void*));
 slist_element_t* slist_add(slist_t* lst, void* data);
 void slist_remove(slist_t* lst, void* data);
 void slist_clear(slist_t* lst);
+int slist_length(slist_t* lst);
 
 #endif
diff --git a/src/tcpproxy.c b/src/tcpproxy.c
index ef71cb4..57d86b3 100644
--- a/src/tcpproxy.c
+++ b/src/tcpproxy.c
@@ -171,6 +171,14 @@ int main(int argc, char* argv[])
     
     yyinit(&opt, &listeners);
     yyparse();
+
+    if(!slist_length(&listeners)) {
+      log_printf(ERROR, "no listeners defined in config file %s", opt.config_file_);
+      listener_clear(&listeners);
+      options_clear(&opt);
+      log_close();
+      exit(-1);
+    }
   }
 
   priv_info_t priv;