cbacklight/main.cpp at master · CoralRocker/cbacklight · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * Author: Gaultier Delbarre
 * Written: 2018
 * BLIGHT --------
 * A program to change the backlight strength of systems which store backlight info in the
 * /sys/class/intel_backlight/ directory. Written in C++. Uses fstreams to write to file.
 * Must be run as root or sudo, as it modifies files in /sys/class. Am working on an
 * implementation in C, and am cleaning up the mess of code which is this project.
 *
 * USAGE ---------
 * To set brightness
 * 	->blight -s [brightness percent]
 * To find the current brightness
 * 	->blight -q
 * To increment brightness
 * 	->blight -i [percent]
 * To decrement brightness
 * 	->blight -d [percent]
 *
 * Must be run with an argument.
 */
#include <fstream>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <sstream>
#include <unistd.h>
#include <string>

using namespace std;

int checkUse(int args)
{
	if(args <= 1)
	{
		cout << "Must Have At Least One Argument" << endl;
		exit(-1);
	}
	if(geteuid() != 0)
	{
		cout << "Must Be Root Or Sudo To Run Program" << endl;
		exit(-1);
	}
	return 0;
}

string checkOutput(string cmd)
{
	FILE *fp;
	char var[16];
	string data;
	fp = popen(cmd.c_str(), "r");
	while (fgets(var, 16, fp) != NULL)
	{
		data.append(var);
	}
	pclose(fp);
	return data;
}
int main(int argc, char **argv)
{
	int option = -1, i_pct;
	float pct_b, cur_b, max_b;
	char *cvalue = NULL;
	bool inc = false;
	bool dec = false;
	bool set = false;
	checkUse(argc);
	istringstream(checkOutput("cat /sys/class/backlight/intel_backlight/max_brightness")) >> max_b;
	istringstream(checkOutput("cat /sys/class/backlight/intel_backlight/brightness")) >> cur_b;
	pct_b = cur_b*100/max_b;

	while ((option = getopt(argc, argv, "i:d:s:q")) != -1)
	{
		switch (option)
		{
			case 'q':
				cout << "Current Brightness: " << cur_b << endl
					<< "Maximum Brightness: " << max_b << endl
					 << "Percent Brightness: " << pct_b << "%" << endl;
				return 0;
				break;

			case 's':
				cvalue = optarg;
				set = true;
				break;
			case 'i':
				cvalue = optarg;
				inc = true;
				break;
			case 'd':
				cvalue = optarg;
				dec = true;
				break;
		}
	}

	if(inc)
	{
		pct_b = atof(cvalue)/100 * max_b;
		//cout << "INC BY: " << pct_b << endl;
		cur_b += pct_b;
		if((int)cur_b > max_b)
			cur_b = max_b;
		//cout << "INC BY: " << (int)cur_b << endl;
		fstream file;
		file.open("/sys/class/backlight/intel_backlight/brightness", ios::out);
                file << to_string((int)cur_b) << endl;

	}

	if(dec)
	{
		pct_b = atof(cvalue)/100 * max_b;
		//cout << "DEC BY: " << pct_b << endl;
		cur_b -= pct_b;
		fstream file;
		file.open("/sys/class/backlight/intel_backlight/brightness", ios::out);
		file << to_string((int)cur_b) << endl;
	}

	if(set)
	{
		if (!(atof(cvalue) > 100) && !(atof(cvalue) <= 0))
		{
			i_pct = (atof(cvalue)/100) * max_b;
			fstream file;
			file.open("/sys/class/backlight/intel_backlight/brightness", ios::out);
			file << to_string(i_pct) << endl;
		}else{
			cout << cvalue << " is not between 0 and 100" << endl;
			return 0;
		}

	}
}