module/alsa+backlight: round() percentage values

Closes #10

meson.build

@@ -42,6 +42,7 @@ endif
 
 # Common dependencies
 dl = cc.find_library('dl')
+m = cc.find_library('m')
 threads = dependency('threads')
 pixman = dependency('pixman-1')
 yaml = dependency('yaml-0.1')

modules/alsa.c

@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 #include <alsa/asoundlib.h>
 
@@ -44,7 +45,7 @@ content(struct module *mod)
     struct private *m = mod->private;
 
     int percent = m->vol_max - m->vol_min > 0
-        ? 100 * m->vol_cur / (m->vol_max - m->vol_min)
+        ? round(100. * m->vol_cur / (m->vol_max - m->vol_min))
         : 0;
 
     mtx_lock(&mod->lock);

modules/backlight.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 #include <assert.h>
 #include <unistd.h>
 #include <poll.h>
@@ -46,7 +47,7 @@ content(struct module *mod)
 
     const long current = m->current_brightness;
     const long max = m->max_brightness;
-    const long percent = max > 0 ? 100 * current / max : 0;
+    const long percent = max > 0 ? round(100. * current / max) : 0;
 
     struct tag_set tags = {
         .tags = (struct tag *[]){

modules/meson.build

@@ -10,8 +10,8 @@ xcb_xkb = dependency('xcb-xkb', required: get_option('backend-x11'))
 
 # Module name -> (source-list, dep-list)
 deps = {
-  'alsa': [[], [alsa]],
-  'backlight': [[], [udev]],
+  'alsa': [[], [m, alsa]],
+  'backlight': [[], [m, udev]],
   'battery': [[], [udev]],
   'clock': [[], []],
   'i3': [['i3-common.c', 'i3-common.h'], [dynlist, json]],