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) ? bprintf("%d", perc) : NULL;
  20         }
  21
  22         const char *
  23         battery_state(const char *bat)
  24         {
  25                 struct {
  26                         char *state;
  27                         char *symbol;
  28                 } map[] = {
  29                         { "Charging",    "+" },
  30                         { "Discharging", "-" },
  31                 };
  32                 size_t i;
  33                 char path[PATH_MAX], state[12];
  34
  35                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
  36                          bat, "/status");
  37                 if (pscanf(path, "%12s", state) != 1) {
  38                         return NULL;
  39                 }
  40
  41                 for (i = 0; i < LEN(map); i++) {
  42                         if (!strcmp(map[i].state, state)) {
  43                                 break;
  44                         }
  45                 }
  46                 return (i == LEN(map)) ? "?" : map[i].symbol;
  47         }
  48 #elif defined(__OpenBSD__)
  49         #include <fcntl.h>
  50         #include <machine/apmvar.h>
  51         #include <sys/ioctl.h>
  52         #include <unistd.h>
  53
  54         const char *
  55         battery_perc(const char *bat)
  56         {
  57                 struct apm_power_info apm_info;
  58                 int fd;
  59
  60                 UNUSED(bat); /* no way to specify battery on OpenBSD */
  61
  62                 fd = open("/dev/apm", O_RDONLY);
  63                 if (fd < 0) {
  64                         fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  65                         return NULL;
  66                 }
  67
  68                 if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  69                         fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n",
  70                                 strerror(errno));
  71                         close(fd);
  72                         return NULL;
  73                 }
  74                 close(fd);
  75
  76                 return bprintf("%d", apm_info.battery_life);
  77         }
  78
  79         const char *
  80         battery_state(const char *bat)
  81         {
  82                 int fd;
  83                 size_t i;
  84                 struct apm_power_info apm_info;
  85                 struct {
  86                         unsigned int state;
  87                         char *symbol;
  88                 } map[] = {
  89                         { APM_AC_ON,      "+" },
  90                         { APM_AC_OFF,     "-" },
  91                 };
  92
  93                 UNUSED(bat); /* no way to specify battery on OpenBSD */
  94
  95                 fd = open("/dev/apm", O_RDONLY);
  96                 if (fd < 0) {
  97                         fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  98                         return NULL;
  99                 }
 100
 101                 if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
 102                         fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n",
 103                                 strerror(errno));
 104                         close(fd);
 105                         return NULL;
 106                 }
 107                 close(fd);
 108
 109                 for (i = 0; i < LEN(map); i++) {
 110                         if (map[i].state == apm_info.ac_state) {
 111                                 break;
 112                         }
 113                 }
 114                 return (i == LEN(map)) ? "?" : map[i].symbol;
 115         }
 116 #endif