From 30c94ef6af70d34314bcebfd238363f519192bb5 Mon Sep 17 00:00:00 2001
From: Markus Schneider <markus@icet-clan.de>
Date: Fri, 25 Aug 2017 16:47:08 +0200
Subject: Fix rounding errors when using percentages

---
 Makefile        | 2 +-
 brightnessctl.c | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 63cdcc4..b3986fb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 VERSION = 0.2
 DESTDIR ?= /usr/local
-CFLAGS += -std=c99 -g -Wall -Wextra -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE=200809L
+CFLAGS += -std=c99 -g -Wall -Wextra -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE=200809L -lm
 MODE ?= 4711
 
 all: brightnessctl
diff --git a/brightnessctl.c b/brightnessctl.c
index f169608..71321c4 100644
--- a/brightnessctl.c
+++ b/brightnessctl.c
@@ -10,6 +10,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 static char *path = "/sys/class";
 static char *classes[] = { "backlight", "leds", NULL };
@@ -292,7 +293,7 @@ int print_device(struct device *dev) {
 
 void apply_value(struct device *d, struct value *val) {
 	long new, mod = val->v_type == ABSOLUTE ?
-			val->val : val->val / 100.0 * d->max_brightness;
+			val->val : ceil(val->val / 100.0 * d->max_brightness);
 	if (val->d_type == DIRECT) {
 		new = mod > d->max_brightness ? d->max_brightness : mod;
 		goto apply;
-- 
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