From 6df91618c338179f78f0e8e3de5823ff8638d9e1 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@collectd.org>
Date: Thu, 28 Jul 2016 12:10:07 +0200
Subject: [PATCH] empty_counter match: Code cleanup.

---
 src/match_empty_counter.c | 66 ++++++++++-----------------------------
 1 file changed, 16 insertions(+), 50 deletions(-)

diff --git a/src/match_empty_counter.c b/src/match_empty_counter.c
index caa3e7e3..bff9448a 100644
--- a/src/match_empty_counter.c
+++ b/src/match_empty_counter.c
@@ -1,6 +1,6 @@
 /**
  * collectd - src/match_empty_counter.c
- * Copyright (C) 2009       Florian Forster
+ * Copyright (C) 2009-2016  Florian Forster
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -28,65 +28,35 @@
 #include "common.h"
 #include "filter_chain.h"
 
-/*
- * private data types
- */
-struct mec_match_s;
-typedef struct mec_match_s mec_match_t;
-struct mec_match_s
-{
-  int dummy;
-};
-
 /*
  * internal helper functions
  */
 static int mec_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
 {
-  mec_match_t *m;
-
-  m = calloc (1, sizeof (*m));
-  if (m == NULL)
-  {
-    ERROR ("mec_create: calloc failed.");
-    return (-ENOMEM);
-  }
-
   if (ci->children_num != 0)
   {
     ERROR ("empty_counter match: This match does not take any additional "
         "configuration.");
   }
 
-  *user_data = m;
+  *user_data = NULL;
   return (0);
 } /* }}} int mec_create */
 
-static int mec_destroy (void **user_data) /* {{{ */
+static int mec_destroy (__attribute__((unused)) void **user_data) /* {{{ */
 {
-  if (user_data != NULL)
-  {
-    sfree (*user_data);
-  }
-
   return (0);
 } /* }}} int mec_destroy */
 
-static int mec_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
+static int mec_match (__attribute__((unused)) const data_set_t *ds, /* {{{ */
     const value_list_t *vl,
-    notification_meta_t __attribute__((unused)) **meta, void **user_data)
+    __attribute__((unused)) notification_meta_t **meta,
+    __attribute__((unused)) void **user_data)
 {
-  int num_counters;
-  int num_empty;
+  int num_counters = 0;
+  int num_empty = 0;
   size_t i;
 
-  if ((user_data == NULL) || (*user_data == NULL))
-    return (-1);
-
-
-  num_counters = 0;
-  num_empty = 0;
-
   for (i = 0; i < ds->ds_num; i++)
   {
     if ((ds->ds[i].type != DS_TYPE_DERIVE)
@@ -99,23 +69,19 @@ static int mec_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
       num_empty++;
   }
 
-  if (num_counters == 0)
-    return (FC_MATCH_NO_MATCH);
-  else if (num_counters == num_empty)
+  if ((num_counters != 0) && (num_counters == num_empty))
     return (FC_MATCH_MATCHES);
-  else
-    return (FC_MATCH_NO_MATCH);
+
+  return (FC_MATCH_NO_MATCH);
 } /* }}} int mec_match */
 
 void module_register (void)
 {
-  match_proc_t mproc;
-
-  memset (&mproc, 0, sizeof (mproc));
-  mproc.create  = mec_create;
-  mproc.destroy = mec_destroy;
-  mproc.match   = mec_match;
-  fc_register_match ("empty_counter", mproc);
+  fc_register_match ("empty_counter", (match_proc_t) {
+    .create  = mec_create,
+    .destroy = mec_destroy,
+    .match   = mec_match,
+  });
 } /* module_register */
 
 /* vim: set sw=2 sts=2 tw=78 et fdm=marker : */
-- 
2.30.2