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Print current brightness when called without arguments #2

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Print current brightness when called without arguments #2

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7 changes: 5 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,16 +20,19 @@ sudo make uninstall

## Usage
```sh
$ backlight_control
Usage: backlight_control [+|-]<value>
$ backlight_control -h
Usage: backlight_control [-h] [[+|-]<value>]

Examples:
backlight_control
backlight_control +10
backlight_control -10
backlight_control 50

```

`backlight_control` prints the current brightness

`backlight_control +n` increases brightness by n%

`backlight_control -n` decreases brightness by n%
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16 changes: 12 additions & 4 deletions backlight_control.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/**
* A program to control the backlight brightness.
Expand All @@ -14,9 +15,10 @@

void print_usage(char *name) {
printf(
"Usage: %1$s [+|-]<value>\n"
"Usage: %1$s [-h] [[+|-]<value>]\n"
"\n"
"Examples:\n"
"\t%1$s\n"
"\t%1$s +10\n"
"\t%1$s -10\n"
"\t%1$s 50\n",
Expand All @@ -34,13 +36,19 @@ FILE *open_file(char *name) {
}

int main(int argc, char **argv) {
if (argc != 2) {
if (argc >= 2 && strcmp(argv[1], "-h") == 0) {
print_usage(argv[0]);
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
int value = strtol(argv[1], NULL, 10);
int value = (argc == 2) ? strtol(argv[1], NULL, 10) : 0;
FILE *brightness = open_file(BRIGHTNESS_FILE);
int brightness_value = MIN_BRIGHTNESS;
if (argc == 1) {
fscanf(brightness, "%d", &brightness_value);
printf("%.1f\n", 100.0 * brightness_value / MAX_BRIGHTNESS);
fclose(brightness);
return EXIT_SUCCESS;
}
switch (argv[1][0]) {
case '+':
case '-':
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