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@@ -0,0 +1,379 @@
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+#define _GNU_SOURCE
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+
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <dirent.h>
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+#include <string.h>
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+#include <unistd.h>
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+#include <limits.h>
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+
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+typedef enum LBOOL{
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+ TRUE = 0,
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+ FALSE = 1
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+} LBOOL;
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+
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+typedef enum LOPTYPE{
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+ SET = 0,
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+ ADD = 1,
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+ SUB = 2
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+} LOPTYPE;
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+
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+/* Flags */
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+LBOOL q; /* Quiet, supresses output */
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+LBOOL c; /* print unprecise current value in percentage */
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+LBOOL m; /* read max value*/
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+LBOOL p; /* precision read current value */
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+int wbright;
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+LOPTYPE ot;
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+
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+LBOOL readint(const char* f, unsigned int *i){
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+ FILE* ff = fopen(f, "r");
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+ if(ff){
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+ fscanf(ff, "%u", i);
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+ fclose(ff);
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+ return TRUE;
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+ }else{
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+ return FALSE;
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+ }
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+}
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+
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+LBOOL writeint(const char* f, unsigned int i){
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+ FILE* ff = fopen(f, "w");
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+ if(ff){
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+ fprintf(ff, "%u", i);
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+ fclose(ff);
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+ return TRUE;
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+ }else{
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+ return FALSE;
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+ }
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+}
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+
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+
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+LBOOL is_dir(const char* d){
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+ DIR* dd = opendir(d);
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+ if(dd){
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+ closedir(dd);
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+ return TRUE;
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+ }else{
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+ return FALSE;
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+ }
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+}
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+
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+LBOOL is_writable(const char* f){
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+ FILE* dd = fopen(f, "w");
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+ if(dd){
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+ fclose(dd);
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+ return TRUE;
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+ }else{
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+ return FALSE;
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+ }
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+}
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+
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+typedef struct {
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+ char* name;
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+ unsigned int current_brightness;
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+ unsigned int max_brightness;
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+ char* c_path; /* Controller-path */
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+ char* cb_path; /* Current brightness-path */
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+ char* mb_path; /* Max brightness-path */
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+ char* b_path; /* Brightness-path */
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+ enum LBOOL is_ok;
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+} controller;
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+
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+typedef struct {
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+ controller controllers[256];
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+ unsigned int num_controllers;
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+} fetch_result;
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+
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+
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+fetch_result fetch_controllers(const char* ctrldir){
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+ fetch_result returner;
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+ struct dirent* ep;
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+
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+ DIR* lcdir = opendir(ctrldir);
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+
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+ returner.num_controllers = 0;
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+
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+ if(!lcdir){
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+ if(q == FALSE)
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+ printf("Error: Could not open directory '%s'!\n", ctrldir);
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+ }else{
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+ while( ( ep = readdir(lcdir) ) ){
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+ char* currctrldir = "";
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+ char* currctrldir_curr = "";
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+ char* currctrldir_max = "";
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+ char* currctrldir_f = "";
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+ if( ep->d_name[0] != '.'){
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+ returner.controllers[returner.num_controllers].name = ep->d_name;
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+
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+ /* Set some default values, in case something fails we dont just get null */
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+ returner.controllers[returner.num_controllers].current_brightness = 0;
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+ returner.controllers[returner.num_controllers].max_brightness = 0;
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+ returner.controllers[returner.num_controllers].is_ok = TRUE;
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+ returner.controllers[returner.num_controllers].c_path = NULL;
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+ returner.controllers[returner.num_controllers].cb_path = NULL;
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+ returner.controllers[returner.num_controllers].b_path = NULL;
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+ returner.controllers[returner.num_controllers].mb_path = NULL;
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+
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+ /* Get path to the current controller dir */
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+ asprintf(&currctrldir, "%s/%s", ctrldir, ep->d_name);
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+ returner.controllers[returner.num_controllers].c_path = currctrldir;
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+ if(is_dir(currctrldir) == FALSE){
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+ if(q == FALSE)
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+ printf("Warning: '%s' is not a directory, check your system.\n", currctrldir);
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+ returner.controllers[returner.num_controllers].is_ok = FALSE;
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+ }
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+
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+ /* Get path to current actual_brightness-file */
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+ asprintf(&currctrldir_curr, "%s/%s", currctrldir, "actual_brightness");
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+ returner.controllers[returner.num_controllers].cb_path = currctrldir_curr;
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+ if( readint(currctrldir_curr, &returner.controllers[returner.num_controllers].current_brightness) == FALSE ){
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+ if(q == FALSE)
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+ printf("Warning: Can't read actual_brightness-file of '%s'. Will ignore this controller.\n", ep->d_name);
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+ returner.controllers[returner.num_controllers].is_ok = FALSE;
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+ }
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+
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+ /* Get path to current max_brightness-file*/
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+ asprintf(&currctrldir_max, "%s/%s", currctrldir, "max_brightness");
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+ returner.controllers[returner.num_controllers].mb_path = currctrldir_max;
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+ if( readint(currctrldir_max, &returner.controllers[returner.num_controllers].max_brightness) == FALSE ){
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+ if(q == FALSE)
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+ printf("Warning: Can't read max_brightness-file of '%s'. Will ignore this controller.\n", ep->d_name);
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+ returner.controllers[returner.num_controllers].is_ok = FALSE;
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+ }
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+
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+ /* Get path to current brightness-file */
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+ asprintf(&currctrldir_f, "%s/%s", currctrldir, "brightness");
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+ returner.controllers[returner.num_controllers].b_path = currctrldir_f;
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+ if( is_writable(currctrldir_f) == FALSE){
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+ if(q == FALSE)
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+ printf("Warning: Controllerfile of '%s' is not writable. Will ignore this controller.\n", ep->d_name);
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+ returner.controllers[returner.num_controllers].is_ok = FALSE;
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+ }
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+
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+
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+ returner.num_controllers++;
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+ }
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+ }
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+ closedir(lcdir);
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+ }
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+ return returner;
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+}
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+
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+controller* get_best_controller(fetch_result* res){
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+ unsigned int it;
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+ unsigned int cmax;
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+ LBOOL foundokctrl;
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+ controller* returner;
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+
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+
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+ it = 0;
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+ cmax = 0;
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+ foundokctrl = FALSE;
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+
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+ returner = NULL;
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+
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+ while(it < res->num_controllers){
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+ if(res->controllers[it].is_ok == TRUE){
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+ if(foundokctrl != TRUE){
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+ foundokctrl = TRUE;
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+ returner = &res->controllers[it];
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+ }
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+ if(res->controllers[it].max_brightness > cmax){
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+ cmax = res->controllers[it].max_brightness;
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+ returner = &res->controllers[it];
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+ }
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+ }
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+ it++;
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+ }
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+
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+ return returner;
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+}
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+
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+void usage(){
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+ printf("Usage: light [-qcas] <value>\n\n\t-q:\t Run quiet, supresses output.\n\t-c:\t Prints the current brightness in percent and exits.(Not precise)\n\t-p:\t Prints the current brightness directly from controller and exits. (Precise)\n\t-m:\t Prints the max brightness directly from controller and exits. (To be used side-by-side with -p)\n\t-a:\t Add the value instead of setting it.\n\t-s:\t Subtract the value instead of setting it.\n\n\t<value>\t Brightness wanted in percent.\n\n");
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+}
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+
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+int main(int argc, char **argv) {
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+ unsigned int argsit;
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+
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+ fetch_result res;
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+ controller* best_ctrl;
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+ unsigned int citr;
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+ uid_t uid;
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+ unsigned int minlight;
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+ LBOOL given;
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+ unsigned int real_wbright;
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+ unsigned int minlight_nonp;
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+ unsigned int curr_bright;
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+ unsigned int curr_brightp;
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+
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+
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+ /* Get UID */
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+ uid = getuid();
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+
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+ /* Parse arguments */
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+ q=FALSE;
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+ c=FALSE;
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+ m=FALSE;
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+ p=FALSE;
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+ ot=SET;
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+ wbright=0;
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+ argsit = 1;
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+ given=FALSE;
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+ while(argsit < argc){
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+ char* carg = argv[argsit];
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+ if(carg[0] == '-'){
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+ unsigned int cargit = 1;
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+ while(cargit < strlen(carg)){
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+ switch(carg[cargit]){
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+ case 'q':
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+ q = TRUE;
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+ break;
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+ case 'a':
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+ ot = ADD;
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+ break;
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+ case 's':
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+ ot = SUB;
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+ break;
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+ case 'c':
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+ c = TRUE;
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+ break;
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+ case 'p':
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+ p = TRUE;
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+ break;
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+ case 'm':
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+ m = TRUE;
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+ break;
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+ default:
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+ break;
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+ }
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+ cargit++;
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+ }
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+ }else{
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+ wbright = atoi(carg);
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+ given=TRUE;
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+ }
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+
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+ argsit++;
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+ }
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+
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+ if(c == TRUE || m == TRUE || p == TRUE){
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+ q = TRUE;
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+ }
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+
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+ if(given == FALSE && c == FALSE && m == FALSE && p == FALSE){
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+ usage();
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+ return 0;
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+ }
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+ if(q == FALSE)
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+ printf("Light v0.4 - Fredrik Haikarainen\n");
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+
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272
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+ /* Get and check minlight */
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+
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+ if(readint("/etc/light/minlight", &minlight) == FALSE){
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+ minlight = 5;
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+ if(q == FALSE)
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+ printf("Warning: Couldn't read /etc/light/minlight, using 5 as default.\n");
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+ }
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+
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280
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+ /* Fetch controllers */
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+ if(q == FALSE)
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+ printf("Fetching controllers..\n");
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+
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+ res = fetch_controllers("/sys/class/backlight");
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+
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+ citr = 0;
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+ while(citr < res.num_controllers){
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+ controller* currc = &res.controllers[citr];
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+ if(currc->is_ok == TRUE){
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+ if(q == FALSE)
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+ printf("\tFound '%s' (%u/%u)\n", currc->name, currc->current_brightness, currc->max_brightness);
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+ }else{
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+ if(q == FALSE)
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+ printf("\tFound '%s', but ignoring\n", currc->name);
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+ }
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+ citr++;
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+ }
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+
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299
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+ if(q == FALSE)
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+ printf("\n");
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+
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302
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+ /* Get the best controller */
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+ best_ctrl = get_best_controller(&res);
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+
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+ if(best_ctrl == NULL){
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+ if(uid == 0){
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+ if(q == FALSE)
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+ printf("No okay controller found, even though you are root! Check your system.\n");
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309
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+ }else{
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+ if(q == FALSE)
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+ printf("No okay controller found, check your permissions or try to run as root.\n");
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+ }
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+ return 1;
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+ }
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+
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+ if(p == TRUE){
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+ printf("%u\n", best_ctrl->current_brightness);
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+ return 0;
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319
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+ }
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+
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321
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+ if(m == TRUE){
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+ printf("%u\n", best_ctrl->max_brightness);
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+ return 0;
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+ }
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+
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326
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+ if(q == FALSE)
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327
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+ printf("Using controller '%s' ..\n", best_ctrl->name);
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+
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329
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+ if(wbright < 0){ wbright = 0;}
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+ if(wbright > 100){wbright=100;}
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+
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332
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+ curr_bright = best_ctrl->current_brightness;
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+ curr_brightp = (float)((float)curr_bright / (float)best_ctrl->max_brightness) * 100;
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+
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+
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+ if(c == TRUE){
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+ printf("%u\n", curr_brightp);
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+ return 0;
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+ }
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+
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341
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+ switch(ot){
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+ case SET:
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+ real_wbright = best_ctrl->max_brightness * ( (float)wbright / 100 );
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+ break;
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+ case ADD:
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+ real_wbright = ( best_ctrl->max_brightness * ( (float)( curr_brightp + wbright +1) / 100 ));
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347
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+ break;
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+ case SUB:
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+ real_wbright = ( best_ctrl->max_brightness * ( (float)( curr_brightp - wbright + 1) / 100 ));
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350
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+ break;
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351
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+ default:
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+ break;
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353
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+ }
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+
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355
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+ minlight_nonp = best_ctrl->max_brightness * ( (float)minlight / 100);
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356
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+
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357
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+ /* FIXME
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358
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+ Line below makes sure the value never wraps around and gets higher. Puts a (high) limit on max brightness.
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359
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+ Not sure if safe for portabilities sake.
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360
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+ */
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361
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+ if(real_wbright > ((UINT_MAX/2) - best_ctrl->max_brightness)){ real_wbright = minlight_nonp; }
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362
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+
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363
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+
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364
|
+
|
|
365
|
+ if(real_wbright > best_ctrl->max_brightness){real_wbright = best_ctrl->max_brightness;}
|
|
366
|
+ if(real_wbright < minlight_nonp){real_wbright = minlight_nonp;}
|
|
367
|
+
|
|
368
|
+ if(q == FALSE)
|
|
369
|
+ printf("Writing %u to file '%s'..\n", real_wbright, best_ctrl->b_path);
|
|
370
|
+
|
|
371
|
+ if(writeint(best_ctrl->b_path, real_wbright) == FALSE){
|
|
372
|
+ if(q == FALSE){
|
|
373
|
+ printf("Error: Could not write to file %s, check your permissions!\n", best_ctrl->b_path);
|
|
374
|
+ }
|
|
375
|
+ return 1;
|
|
376
|
+ }
|
|
377
|
+
|
|
378
|
+ return 0;
|
|
379
|
+}
|