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_state(const char *bat)
  25         {
  26                 struct {
  27                         char *state;
  28                         char *symbol;
  29                 } map[] = {
  30                         { "Charging",    "+" },
  31                         { "Discharging", "-" },
  32                 };
  33                 size_t i;
  34                 char path[PATH_MAX], state[12];
  35
  36                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
  37                          bat, "/status");
  38                 if (pscanf(path, "%12s", state) != 1) {
  39                         return NULL;
  40                 }
  41
  42                 for (i = 0; i < LEN(map); i++) {
  43                         if (!strcmp(map[i].state, state)) {
  44                                 break;
  45                         }
  46                 }
  47                 return (i == LEN(map)) ? "?" : map[i].symbol;
  48         }
  49 #elif defined(__OpenBSD__)
  50         #include <fcntl.h>
  51         #include <machine/apmvar.h>
  52         #include <sys/ioctl.h>
  53         #include <unistd.h>
  54
  55         const char *
  56         battery_perc(const char *null)
  57         {
  58                 struct apm_power_info apm_info;
  59                 int fd;
  60
  61                 fd = open("/dev/apm", O_RDONLY);
  62                 if (fd < 0) {
  63                         fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  64                         return NULL;
  65                 }
  66
  67                 if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  68                         fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n",
  69                                 strerror(errno));
  70                         close(fd);
  71                         return NULL;
  72                 }
  73                 close(fd);
  74
  75                 return bprintf("%d", apm_info.battery_life);
  76         }
  77
  78         const char *
  79         battery_state(const char *bat)
  80         {
  81                 int fd;
  82                 size_t i;
  83                 struct apm_power_info apm_info;
  84                 struct {
  85                         unsigned int state;
  86                         char *symbol;
  87                 } map[] = {
  88                         { APM_AC_ON,      "+" },
  89                         { APM_AC_OFF,     "-" },
  90                 };
  91
  92                 fd = open("/dev/apm", O_RDONLY);
  93                 if (fd < 0) {
  94                         fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  95                         return NULL;
  96                 }
  97
  98                 if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  99                         fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n",
 100                                 strerror(errno));
 101                         close(fd);
 102                         return NULL;
 103                 }
 104                 close(fd);
 105
 106                 for (i = 0; i < LEN(map); i++) {
 107                         if (map[i].state == apm_info.ac_state) {
 108                                 break;
 109                         }
 110                 }
 111                 return (i == LEN(map)) ? "?" : map[i].symbol;
 112         }
 113 #endif