components/battery.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "../util.h"
   7
   8 #if defined(__linux__)
   9         #include <limits.h>
  10
  11         const char *
  12         battery_perc(const char *bat)
  13         {
  14                 int perc;
  15                 char path[PATH_MAX];
  16
  17                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
  18                          bat, "/capacity");
  19                 return (pscanf(path, "%i", &perc) == 1) ?
  20                        bprintf("%d", perc) : NULL;
  21         }
  22
  23         const char *
  24         battery_power(const char *bat)
  25         {
  26                 int watts;
  27                 char path[PATH_MAX];
  28
  29                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
  30                          bat, "/power_now");
  31                 return (pscanf(path, "%i", &watts) == 1) ?
  32                        bprintf("%d", (watts + 500000) / 1000000) : NULL;
  33         }
  34
  35         const char *
  36         battery_state(const char *bat)
  37         {
  38                 struct {
  39                         char *state;
  40                         char *symbol;
  41                 } map[] = {
  42                         { "Charging",    "+" },
  43                         { "Discharging", "-" },
  44                         { "Full",        "=" },
  45                         { "Unknown",     "/" },
  46                 };
  47                 size_t i;
  48                 char path[PATH_MAX], state[12];
  49
  50                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
  51                          bat, "/status");
  52                 if (pscanf(path, "%12s", state) != 1) {
  53                         return NULL;
  54                 }
  55
  56                 for (i = 0; i < LEN(map); i++) {
  57                         if (!strcmp(map[i].state, state)) {
  58                                 break;
  59                         }
  60                 }
  61                 return (i == LEN(map)) ? "?" : map[i].symbol;
  62         }
  63 #elif defined(__OpenBSD__)
  64         #include <fcntl.h>
  65         #include <machine/apmvar.h>
  66         #include <sys/ioctl.h>
  67         #include <unistd.h>
  68
  69         const char *
  70         battery_perc(const char *null)
  71         {
  72                 struct apm_power_info apm_info;
  73                 int fd;
  74
  75                 fd = open("/dev/apm", O_RDONLY);
  76                 if (fd < 0) {
  77                         fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  78                         return NULL;
  79                 }
  80
  81                 if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  82                         fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n",
  83                                 strerror(errno));
  84                         close(fd);
  85                         return NULL;
  86                 }
  87                 close(fd);
  88
  89                 return bprintf("%d", apm_info.battery_life);
  90         }
  91 #endif