statuses/battery.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include "string.h"
   5 #include "battery.h"
   6
   7 #ifndef POWER_BASEDIR
   8         #define POWER_BASEDIR "/sys/class/power_supply/"
   9 #endif
  10
  11
  12 void status_battery(char *batname)
  13 {
  14         char batpath[256];
  15         int batpathlen;
  16
  17         char stline[16];
  18         ssize_t stlen;
  19
  20         int batt_now = 0;
  21         int batt_full = -1;
  22         int batt_percent = -1;
  23         int batt_current = 1;
  24         int batt_power = 1;
  25         int batt_voltage = 0;
  26         float batt_time = -1;
  27         float batt_watts = -1;
  28
  29
  30         // Prepare path
  31         batpathlen = sizeof(POWER_BASEDIR) - 1 + strlen(batname);
  32         if (batpathlen + 1 + sizeof("/energy_full") >= sizeof(batpath))
  33         {
  34                 statusError("status_battery",
  35                         "batpath buffer too small",
  36                         batname);
  37                 return;
  38         }
  39         strcpy(batpath, POWER_BASEDIR);
  40         strcat(batpath, batname);
  41
  42
  43         // Is the battery present?
  44         if (access(batpath, F_OK))
  45         {
  46                 //printf(" ^fg(grey)[%s] ", batname);
  47                 return;
  48         }
  49
  50
  51         // Get info
  52         strcpy(&batpath[batpathlen], "/energy_now");
  53         stlen = fileRead(stline, sizeof(stline), batpath);
  54         if (stlen > 0)
  55                 batt_now = atoi(stline);
  56
  57         strcpy(&batpath[batpathlen], "/energy_full");
  58         stlen = fileRead(stline, sizeof(stline), batpath);
  59         if (stlen > 0)
  60                 batt_full = atoi(stline);
  61
  62         strcpy(&batpath[batpathlen], "/power_now");
  63         stlen = fileRead(stline, sizeof(stline), batpath);
  64         if (stlen > 0)
  65                 batt_power = atoi(stline);
  66
  67         strcpy(&batpath[batpathlen], "/voltage_now");
  68         stlen = fileRead(stline, sizeof(stline), batpath);
  69         if (stlen > 0)
  70                 batt_voltage = atoi(stline);
  71
  72
  73         // Prettyprint
  74         if (batt_full > 0)
  75                 batt_percent = batt_now / (batt_full / 100);
  76
  77         if (batt_percent <= 40) // 40
  78         {
  79                 if (batt_percent <= 25) // 25
  80                 {
  81                         if (batt_percent <= 10) // 10
  82                                 fputs("^fg(red)", stdout);
  83                         else // 11-25%
  84                                 fputs("^fg(orange)", stdout);
  85                 }
  86                 else // 26-40%
  87                         fputs("^fg(yellow)", stdout);
  88         }
  89         else
  90         {
  91                 if (batt_percent > 70) // 70
  92                         fputs("^fg(white)", stdout);
  93                 else // 41-70%
  94                         fputs("^fg(green)", stdout);
  95         }
  96
  97         batt_current = ((float)batt_power * 100) / ((float)batt_voltage / 100000);
  98         batt_time = (float)batt_now / (float)batt_current;
  99         batt_watts = ((float)batt_power / 1000000);
 100
 101         if (batt_watts == 0)    // fully charged and not in use
 102                 printf(" %s: %d%% _ _ ", batname, batt_percent);
 103         else
 104                 printf(" %s: %d%% %.1fh %.1fW ",
 105                         batname, batt_percent, batt_time, batt_watts);
 106 }