git.sur5r.net Git - i3/i3status/blob - src/print_battery_info.c

   1 // vim:ts=8:expandtab
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 #include "i3status.h"
   7
   8 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
   9 #include <sys/types.h>
  10 #include <sys/sysctl.h>
  11 #endif
  12
  13 /*
  14  * Get battery information from /sys. Note that it uses the design capacity to
  15  * calculate the percentage, not the last full capacity, so you can see how
  16  * worn off your battery is.
  17  *
  18  */
  19 void print_battery_info(int number, const char *format, bool last_full_capacity) {
  20         char buf[1024];
  21         char statusbuf[16];
  22         char percentagebuf[16];
  23         char remainingbuf[256];
  24         const char *walk, *last;
  25         int full_design = -1,
  26             remaining = -1,
  27             present_rate = -1;
  28         charging_status_t status = CS_DISCHARGING;
  29
  30         memset(statusbuf, '\0', sizeof(statusbuf));
  31         memset(percentagebuf, '\0', sizeof(percentagebuf));
  32         memset(remainingbuf, '\0', sizeof(remainingbuf));
  33
  34 #if defined(LINUX)
  35         static char batpath[512];
  36         sprintf(batpath, "/sys/class/power_supply/BAT%d/uevent", number);
  37         if (!slurp(batpath, buf, sizeof(buf))) {
  38                 printf("No battery");
  39                 return;
  40         }
  41
  42         for (walk = buf, last = buf; (walk-buf) < 1024; walk++) {
  43                 if (*walk == '\n') {
  44                         last = walk+1;
  45                         continue;
  46                 }
  47
  48                 if (*walk != '=')
  49                         continue;
  50
  51                 if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW") ||
  52                     BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW"))
  53                         remaining = atoi(walk+1);
  54                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
  55                         present_rate = atoi(walk+1);
  56                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
  57                         status = CS_CHARGING;
  58                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
  59                         status = CS_FULL;
  60                 else {
  61                         /* The only thing left is the full capacity */
  62                         if (last_full_capacity) {
  63                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL") &&
  64                                     !BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL"))
  65                                         continue;
  66                         } else {
  67                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN") &&
  68                                     !BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN"))
  69                                         continue;
  70                         }
  71
  72                         full_design = atoi(walk+1);
  73                 }
  74         }
  75
  76         if ((full_design == 1) || (remaining == -1))
  77                 return;
  78
  79         (void)snprintf(statusbuf, sizeof(statusbuf), "%s",
  80                         (status == CS_CHARGING ? "CHR" :
  81                          (status == CS_DISCHARGING ? "BAT" : "FULL")));
  82
  83         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%.02f%%",
  84                        (((float)remaining / (float)full_design) * 100));
  85
  86         if (present_rate > 0) {
  87                 float remaining_time;
  88                 int seconds, hours, minutes;
  89                 if (status == CS_CHARGING)
  90                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
  91                 else if (status == CS_DISCHARGING)
  92                         remaining_time = ((float)remaining / (float)present_rate);
  93                 else remaining_time = 0;
  94
  95                 seconds = (int)(remaining_time * 3600.0);
  96                 hours = seconds / 3600;
  97                 seconds -= (hours * 3600);
  98                 minutes = seconds / 60;
  99                 seconds -= (minutes * 60);
 100
 101                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02d:%02d:%02d",
 102                         max(hours, 0), max(minutes, 0), max(seconds, 0));
 103         }
 104 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 105         int state;
 106         int sysctl_rslt;
 107         size_t sysctl_size = sizeof(sysctl_rslt);
 108
 109         if (sysctlbyname(BATT_LIFE, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 110                 printf("No battery");
 111                 return;
 112         }
 113
 114         present_rate = sysctl_rslt;
 115         if (sysctlbyname(BATT_TIME, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 116                 printf("No battery");
 117                 return;
 118         }
 119
 120         remaining = sysctl_rslt;
 121         if (sysctlbyname(BATT_STATE, &sysctl_rslt, &sysctl_size, NULL,0) != 0) {
 122                 printf("No battery");
 123                 return;
 124         }
 125
 126         state = sysctl_rslt;
 127         if (state == 0 && present_rate == 100)
 128                 status = CS_FULL;
 129         else if (state == 0 && present_rate < 100)
 130                 status = CS_CHARGING;
 131         else
 132                 status = CS_DISCHARGING;
 133
 134         full_design = sysctl_rslt;
 135
 136         (void)snprintf(statusbuf, sizeof(statusbuf), "%s",
 137                         (status == CS_CHARGING ? "CHR" :
 138                          (status == CS_DISCHARGING ? "BAT" : "FULL")));
 139
 140         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%02d%%",
 141                        present_rate);
 142
 143         if (state == 1) {
 144                 int hours, minutes;
 145                 minutes = remaining;
 146                 hours = minutes / 60;
 147                 minutes -= (hours * 60);
 148                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02dh%02d",
 149                                max(hours, 0), max(minutes, 0));
 150         }
 151 #endif
 152
 153         for (walk = format; *walk != '\0'; walk++) {
 154                 if (*walk != '%') {
 155                         putchar(*walk);
 156                         continue;
 157                 }
 158
 159                 if (strncmp(walk+1, "status", strlen("status")) == 0) {
 160                         printf("%s", statusbuf);
 161                         walk += strlen("status");
 162                 } else if (strncmp(walk+1, "percentage", strlen("percentage")) == 0) {
 163                         printf("%s", percentagebuf);
 164                         walk += strlen("percentage");
 165                 } else if (strncmp(walk+1, "remaining", strlen("remaining")) == 0) {
 166                         printf("%s", remainingbuf);
 167                         walk += strlen("remaining");
 168                 }
 169         }
 170 }