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Code : Tout sélectionner

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
int main(int argc, char *argv[]){
  if (argc!=2)
    {
      fprintf(stderr, "Not enough argument\n");
      return 0;
    }
  int i = atoi(argv[1]);
  char *bright = NULL;
  int brightness;
  FILE *file = fopen("/sys/class/backlight/nvidia_backlight/brightness", "r");
  if(file)
    {
      fscanf(file, "%s", &bright);
      brightness = atoi(&bright);
      brightness+=i;
      if (brightness<50)
	{
	  brightness = 0;
	}
      if (brightness>1023)
	{
	  brightness = 1023;
	}
      fclose(file);
      FILE *test = fopen("/sys/class/backlight/nvidia_backlight/brightness", "w");
      fprintf(test, "%d", brightness);
      fclose(test);
    }
  return 0;
}

Code : Tout sélectionner

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define BACKLIGHT_BRIGHTNESS_FILE "/sys/class/backlight/nvidia_backlight/brightness"
#define BACKLIGHT_BRIGHTNESS_MIN  50
#define BACKLIGHT_BRIGHTNESS_MAX  1023

int main(int argc, char *argv[])
{
	int incr = 0;
	int brightness = 0;
	FILE *file = NULL;
	
	if (argc != 2)
	{
		fprintf(stderr, "Not enough argument\n");
		return 2;
	}
	
	incr = atoi(argv[1]);
	file = fopen(BACKLIGHT_BRIGHTNESS_FILE, "r");
	
	if (file)
	{
		fscanf(file, "%d", &brightness);
		brightness += incr;
	
		if (brightness < BACKLIGHT_BRIGHTNESS_MIN)
		{
			brightness = 0;
		}
		else if (brightness > BACKLIGHT_BRIGHTNESS_MAX)
		{
			brightness = BACKLIGHT_BRIGHTNESS_MAX;
		}
		
		fclose(file);
		file = fopen(BACKLIGHT_BRIGHTNESS_FILE, "w");
		if (file)
		{
			fprintf(file, "%d", brightness);
			fclose(file);
			return 0;
		}
		else
		{
			perror("Fail to open in write mode : " BACKLIGHT_BRIGHTNESS_FILE);
		}
	}
	else
	{
		perror("Fail to open in read mode : " BACKLIGHT_BRIGHTNESS_FILE);
	}
	return 1;
}