battery.c

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