From 68fb21b88c6b5669f4dc40a4e1c69045191aa98a Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@leeloo.lan.home.verplant.org>
Date: Mon, 12 Mar 2007 12:43:18 +0100
Subject: [PATCH] collectd-nagios, rrdtool plugin, unixsock plugin: Use `isnan'
 rather than `==' or `!='.

---
 src/collectd-nagios.c | 10 +++++-----
 src/rrdtool.c         | 18 ++----------------
 src/unixsock.c        |  8 ++++----
 3 files changed, 11 insertions(+), 25 deletions(-)

diff --git a/src/collectd-nagios.c b/src/collectd-nagios.c
index 160412c5..b7c3ffaf 100644
--- a/src/collectd-nagios.c
+++ b/src/collectd-nagios.c
@@ -112,9 +112,9 @@ int match_range (range_t *range, double value)
 {
 	int ret = 0;
 
-	if ((range->min != NAN) && (range->min > value))
+	if (!isnan (range->min) && (range->min > value))
 		ret = 1;
-	if ((range->max != NAN) && (range->max < value))
+	if (!isnan (range->max) && (range->max < value))
 		ret = 1;
 
 	return (((ret - range->invert) == 0) ? 0 : 1);
@@ -268,7 +268,7 @@ int do_check_con_none (int values_num, double *values, char **values_names)
 
 	for (i = 0; i < values_num; i++)
 	{
-		if (values[i] == NAN)
+		if (isnan (values[i]))
 			num_warning++;
 		else if (match_range (&range_critical_g, values[i]) != 0)
 			num_critical++;
@@ -309,7 +309,7 @@ int do_check_con_average (int values_num, double *values, char **values_names)
 	total_num = 0;
 	for (i = 0; i < values_num; i++)
 	{
-		if (values[i] != NAN)
+		if (!isnan (values[i]))
 		{
 			total += values[i];
 			total_num++;
@@ -354,7 +354,7 @@ int do_check_con_sum (int values_num, double *values, char **values_names)
 	total_num = 0;
 	for (i = 0; i < values_num; i++)
 	{
-		if (values[i] != NAN)
+		if (!isnan (values[i]))
 		{
 			total += values[i];
 			total_num++;
diff --git a/src/rrdtool.c b/src/rrdtool.c
index 80fc7671..f19f2693 100644
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -25,20 +25,6 @@
 #include "utils_avltree.h"
 #include "utils_debug.h"
 
-/*
- * This weird macro cascade forces the glibc to define `NAN'. I don't know
- * another way to solve this, so more intelligent solutions are welcome. -octo
- */
-#ifndef __USE_ISOC99
-# define DISABLE__USE_ISOC99 1
-# define __USE_ISOC99 1
-#endif
-#include <math.h>
-#ifdef DISABLE__USE_ISOC99
-# undef DISABLE__USE_ISOC99
-# undef __USE_ISOC99
-#endif
-
 /*
  * Private types
  */
@@ -221,7 +207,7 @@ static int ds_get (char ***ret, const data_set_t *ds)
 			break;
 		}
 
-		if (d->min == NAN)
+		if (isnan (d->min))
 		{
 			strcpy (min, "U");
 		}
@@ -231,7 +217,7 @@ static int ds_get (char ***ret, const data_set_t *ds)
 			min[sizeof (min) - 1] = '\0';
 		}
 
-		if (d->max == NAN)
+		if (isnan (d->max))
 		{
 			strcpy (max, "U");
 		}
diff --git a/src/unixsock.c b/src/unixsock.c
index b4af8b38..0008b224 100644
--- a/src/unixsock.c
+++ b/src/unixsock.c
@@ -277,9 +277,9 @@ static int cache_update (const data_set_t *ds, const value_list_t *vl)
 			vc->counter[i] = 0;
 		}
 
-		if ((vc->gauge[i] == NAN)
-				|| ((ds->ds[i].min != NAN) && (vc->gauge[i] < ds->ds[i].min))
-				|| ((ds->ds[i].max != NAN) && (vc->gauge[i] > ds->ds[i].max)))
+		if (isnan (vc->gauge[i])
+				|| (!isnan (ds->ds[i].min) && (vc->gauge[i] < ds->ds[i].min))
+				|| (!isnan (ds->ds[i].max) && (vc->gauge[i] > ds->ds[i].max)))
 			vc->gauge[i] = NAN;
 	} /* for i = 0 .. ds->ds_num */
 
@@ -483,7 +483,7 @@ static int us_handle_getval (FILE *fh, char **fields, int fields_num)
 		for (i = 0; i < vc->values_num; i++)
 		{
 			fprintf (fh, " %s=", vc->ds->ds[i].name);
-			if (vc->gauge[i] == NAN)
+			if (isnan (vc->gauge[i]))
 				fprintf (fh, "NaN");
 			else
 				fprintf (fh, "%12e", vc->gauge[i]);
-- 
2.30.2