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