rexy712/rexbacklight
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Fixed backlight limit. Fixed return type of get_backlight

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This commit is contained in:
rexy712 2018-01-13 07:27:55 -08:00
parent e3ed7b08de
commit 5f2684cd93
1 changed files with 24 additions and 7 deletions
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31
src/rexbacklight.c
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@ -24,8 +24,10 @@
#include <dirent.h>
#include <errno.h>
//This is where backlight devices can be found in sysfs
static const char* backlight_dir = "/sys/class/backlight/";
//Print out usage message and GPL message if not caused by an error
void usage(int exit_val){
fprintf(stderr, "Usage: rexbacklight [option]\n\n");
@ -60,15 +62,28 @@ struct string_array get_backlight_sources(void){
struct dirent* dir;
fd = opendir(backlight_dir);
//If the dir can't be opened, return no backlight devices
if(!fd){
fprintf(stderr, "Unable to open '%s' for reading!\n", backlight_dir);
return (struct string_array){.list = NULL, .size = 0};
}
char** list = malloc(sizeof(const char*) * 8);
int i;
int i, list_size = 8;
char** list = malloc(sizeof(const char*) * list_size);
for(i = 0;(dir = readdir(fd));){
//Resize list if more than 8 backlight devices exist (not likely)
if(i > list_size){
char** tmp = malloc(sizeof(const char*) * (list_size += 8));
for(int j = 0;j < i;j++){
tmp[j] = list[j];
}
free(list);
list = tmp;
}
//Don't include "." or ".." in directory list
if(!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")){
continue;
}
@ -82,16 +97,18 @@ struct string_array get_backlight_sources(void){
return (struct string_array){.list = list, .size = i};
}
//Delete the list of backlight devices
void free_string_array(struct string_array* s){
for(int i = 0;i < s->size;i++)
free(s->list[i]);
free(s->list);
}
int get_brightness(const char* file){
FILE* bright = fopen(file, "r");
//Read a float from a file
float get_brightness(const char* file){
//Static buffer because it shouldn't be able to exceed 127 chars long
char buff[127];
FILE* bright = fopen(file, "r");
if(!bright){
fprintf(stderr, "Unable to open brightness file \"%s\"!\n", file);
return 0;
@ -171,7 +188,7 @@ int main(int argc, char** argv){
return -1;
}
//save our starting directory so we can change to each backlight directory
//save our starting directory so we can change to each backlight directory (makes logic easier)
const char* starting_dir = getcwd(NULL, 0);
if(chdir(backlight_dir)){
@ -186,7 +203,7 @@ int main(int argc, char** argv){
continue;
}
//Open brightness file for writing
//Write value to backlight files
int out = process_arg(argv[1], 0, get_brightness(backlight_file), get_brightness(max_backlight_file));
FILE* bright = fopen(backlight_file, "w+");
if(!bright){