git.sur5r.net Git - i3/i3status/blob - src/get_battery_info.c

   1 // vim:ts=8:expandtab
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 #include "i3status.h"
   7
   8 /*
   9  * Get battery information from /sys. Note that it uses the design capacity to
  10  * calculate the percentage, not the last full capacity, so you can see how
  11  * worn off your battery is.
  12  *
  13  */
  14 const char *get_battery_info(struct battery *bat) {
  15         char buf[1024];
  16         static char part[512];
  17         char *walk, *last;
  18         int full_design = -1,
  19             remaining = -1,
  20             present_rate = -1;
  21         charging_status_t status = CS_DISCHARGING;
  22
  23         slurp(bat->path, buf, sizeof(buf));
  24
  25         for (walk = buf, last = buf; (walk-buf) < 1024; walk++) {
  26                 if (*walk == '\n') {
  27                         last = walk+1;
  28                         continue;
  29                 }
  30
  31                 if (*walk != '=')
  32                         continue;
  33
  34                 if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW") ||
  35                     BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW"))
  36                         remaining = atoi(walk+1);
  37                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
  38                         present_rate = atoi(walk+1);
  39                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
  40                         status = CS_CHARGING;
  41                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
  42                         status = CS_FULL;
  43                 else {
  44                         /* The only thing left is the full capacity */
  45                         if (bat->use_last_full) {
  46                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL") &&
  47                                     !BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL"))
  48                                         continue;
  49                         } else {
  50                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN") &&
  51                                     !BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN"))
  52                                         continue;
  53                         }
  54
  55                         full_design = atoi(walk+1);
  56                 }
  57         }
  58
  59         if ((full_design == 1) || (remaining == -1))
  60                 return part;
  61
  62         if (present_rate > 0) {
  63                 float remaining_time;
  64                 int seconds, hours, minutes;
  65                 if (status == CS_CHARGING)
  66                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
  67                 else if (status == CS_DISCHARGING)
  68                         remaining_time = ((float)remaining / (float)present_rate);
  69                 else remaining_time = 0;
  70
  71                 seconds = (int)(remaining_time * 3600.0);
  72                 hours = seconds / 3600;
  73                 seconds -= (hours * 3600);
  74                 minutes = seconds / 60;
  75                 seconds -= (minutes * 60);
  76
  77                 (void)snprintf(part, sizeof(part), "%s %.02f%% %02d:%02d:%02d",
  78                         (status == CS_CHARGING ? "CHR" :
  79                          (status == CS_DISCHARGING ? "BAT" : "FULL")),
  80                         (((float)remaining / (float)full_design) * 100),
  81                         max(hours, 0), max(minutes, 0), max(seconds, 0));
  82         } else {
  83                 (void)snprintf(part, sizeof(part), "%s %.02f%%",
  84                         (status == CS_CHARGING ? "CHR" :
  85                          (status == CS_DISCHARGING ? "BAT" : "FULL")),
  86                         (((float)remaining / (float)full_design) * 100));
  87         }
  88         return part;
  89 }