74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#define PREFIX "/sys/class/backlight/amdgpu_bl0/"
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#define BRIGHTNESS PREFIX "brightness"
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#define MAX_BRIGHTNESS PREFIX "max_brightness"
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int brightness;
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char brightness_str[8];
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FILE *brightness_fp;
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int max_brightness;
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char max_brightness_str[8];
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FILE *max_brightness_fp;
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int new_brightness;
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int normalize(int);
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int main(int argc, char* argv[])
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{
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brightness_fp = fopen(BRIGHTNESS, "w+");
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max_brightness_fp = fopen(MAX_BRIGHTNESS, "r");
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brightness = atoi(fgets(brightness_str, 8, brightness_fp));
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max_brightness = atoi(fgets(max_brightness_str, 8, max_brightness_fp));
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if (argc > 1) {
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char *arg = argv[1];
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if (arg[strlen(arg) - 1] == '%') {
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int percent = brightness * 100 / max_brightness;
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arg[strlen(arg) - 1] = 0;
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if (arg[0] == '+')
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percent += atoi(++arg);
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else if (arg[0] == '-')
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percent -= atoi(++arg);
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else
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percent = atoi(arg);
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new_brightness = ceil((float) percent * 255 / 100);
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}
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else {
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if (arg[0] == '+')
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new_brightness = brightness + atoi(++arg);
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else if (arg[0] == '-')
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new_brightness = brightness - atoi(++arg);
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else
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new_brightness = atoi(arg);
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}
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}
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else
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new_brightness = brightness;
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new_brightness = normalize(new_brightness);
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if (new_brightness != brightness) {
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sprintf(brightness_str, "%i", new_brightness);
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fputs(brightness_str, brightness_fp);
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}
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printf("%i/%i (%i%%)\n", new_brightness, max_brightness, new_brightness * 100 / max_brightness);
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}
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int normalize(int brightness)
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{
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if (brightness < 0)
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return 0;
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else if (brightness > max_brightness)
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return max_brightness;
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else
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return brightness;
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}
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