components/Linux/battery.c

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