completed c implementation

Makefile

@@ -0,0 +1,4 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -pedantic -std=c99
+
+ambientd: ambientd.c

README.md

@@ -13,7 +13,7 @@ give a number and not an error
 
 ## Install
 
-Copy ambient.py to a directory in PATH: `sudo cp ambient.py /usr/local/bin`
+Copy ambient.py to a directory in PATH: `sudo cp ambientd.py /usr/local/bin/ambientd`
 
 ## User Service
 

ambientd.c

@@ -26,13 +26,13 @@ int max_luminance = 400;
 // minimum display brightness in percent
 float min_brightness_percent = 0.05;
 
-// retturns the luminance value in percentage between 0 and 1
+// returns the luminance value in percentage between 0 and 1
 int get_luminance_raw (void)
 {
 	const char *x = fgets(STR_BUFFER, sizeof(STR_BUFFER), luminance_fp);
 	if (x == NULL) {
 		fprintf(stderr, "Could not read luminance value: %s\n", strerror(errno));
-		return 1.0;
+		return -1;
 	}
 	int luminance = strtol(STR_BUFFER, NULL, 10);
 	rewind(luminance_fp);
@@ -109,7 +109,8 @@ int main (void)
 		static float luminance;
 		static float luminance_percent;
 
-		luminance_samples[idx] = get_luminance_raw();
+		x = get_luminance_raw();
+		if (x >= 0) luminance_samples[idx] = x;
 		idx = (idx + 1) % MEDIAN_SAMPLES;
 
 		luminance = 0;
@@ -147,7 +148,7 @@ int main (void)
 		actual_brightness = read_int(actual_brightness_fp);
 		if (actual_brightness < 0) {
 			fprintf(stderr, "error reading actual brightness: %s\n", strerror(errno));
-			actual_brightness = brightness_target;
+			actual_brightness = brightness_adjusted;
 		}
 
 		off = actual_brightness - brightness_target;
@@ -155,7 +156,7 @@ int main (void)
         	user_offset = off;
         }
 
-	    printf("brightness target: %d;  user offset: %d; brightness adjusted: %d\n\n", brightness_target, user_offset, brightness_adjusted);
+	    printf("brightness target: %d;  user offset: %d; brightness adjusted: %d\n", brightness_target, user_offset, brightness_adjusted);
 
 	}
 	

sv/ambientd/run

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec ambient.py
+exec ambientd