components/battery.c

   1 /* See LICENSE file for copyright and license details. */
   2 #ifdef __linux__
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 #include "../util.h"
   8
   9 const char *
  10 battery_perc(const char *bat)
  11 {
  12         int perc;
  13         char path[PATH_MAX];
  14
  15         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
  16         return (pscanf(path, "%i", &perc) == 1) ?
  17                bprintf("%d", perc) : NULL;
  18 }
  19
  20 const char *
  21 battery_power(const char *bat)
  22 {
  23         int watts;
  24         char path[PATH_MAX];
  25
  26         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
  27         return (pscanf(path, "%i", &watts) == 1) ?
  28                bprintf("%d", (watts + 500000) / 1000000) : NULL;
  29 }
  30
  31 const char *
  32 battery_state(const char *bat)
  33 {
  34         struct {
  35                 char *state;
  36                 char *symbol;
  37         } map[] = {
  38                 { "Charging",    "+" },
  39                 { "Discharging", "-" },
  40                 { "Full",        "=" },
  41                 { "Unknown",     "/" },
  42         };
  43         size_t i;
  44         char path[PATH_MAX], state[12];
  45
  46         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
  47         if (pscanf(path, "%12s", state) != 1) {
  48                 return NULL;
  49         }
  50
  51         for (i = 0; i < LEN(map); i++) {
  52                 if (!strcmp(map[i].state, state)) {
  53                         break;
  54                 }
  55         }
  56         return (i == LEN(map)) ? "?" : map[i].symbol;
  57 }
  58 #endif