statuses/battery.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "string.h"
   4 #include "battery.h"
   5
   6 #ifndef POWER_BASEDIR
   7         #define POWER_BASEDIR "/sys/class/power_supply/"
   8 #endif
   9
  10
  11 void status_battery(char *batname)
  12 {
  13         char batpath[256];
  14         int batpathlen;
  15
  16         char stline[16];
  17         ssize_t stlen;
  18
  19         int batt_now = 0;
  20         int batt_full = -1;
  21         int batt_percent = -1;
  22         int batt_current = 1;
  23         int batt_voltage = 0;
  24         float batt_time = -1;
  25         float batt_watts = -1;
  26
  27
  28         // Prepare path
  29         batpathlen = sizeof(POWER_BASEDIR) - 1 + strlen(batname);
  30         if (batpathlen + 1 + sizeof("/energy_full") >= sizeof(batpath))
  31         {
  32                 statusError("status_battery",
  33                         "batpath buffer too small",
  34                         batname);
  35                 return;
  36         }
  37         strcpy(batpath, POWER_BASEDIR);
  38         strcat(batpath, batname);
  39
  40
  41         // Get info
  42         strcpy(&batpath[batpathlen], "/energy_now");
  43         stlen = fileRead(stline, sizeof(stline), batpath);
  44         if (stlen > 0)
  45                 batt_now = atoi(stline);
  46
  47         strcpy(&batpath[batpathlen], "/energy_full");
  48         stlen = fileRead(stline, sizeof(stline), batpath);
  49         if (stlen > 0)
  50                 batt_full = atoi(stline);
  51
  52         strcpy(&batpath[batpathlen], "/current_now");
  53         stlen = fileRead(stline, sizeof(stline), batpath);
  54         if (stlen > 0)
  55                 batt_current = atoi(stline);
  56
  57         strcpy(&batpath[batpathlen], "/voltage_now");
  58         stlen = fileRead(stline, sizeof(stline), batpath);
  59         if (stlen > 0)
  60                 batt_voltage = atoi(stline);
  61
  62
  63         // Prettyprint
  64         if (batt_full > 0)
  65                 batt_percent = batt_now / (batt_full / 100);
  66
  67         if (batt_percent <= 40) // 40
  68         {
  69                 if (batt_percent <= 25) // 25
  70                 {
  71                         if (batt_percent <= 10) // 10
  72                                 fputs("^fg(red)", stdout);
  73                         else // 11-25%
  74                                 fputs("^fg(orange)", stdout);
  75                 }
  76                 else // 26-40%
  77                         fputs("^fg(yellow)", stdout);
  78         }
  79         else
  80         {
  81                 if (batt_percent > 70) // 70
  82                         fputs("^fg(white)", stdout);
  83                 else // 41-70%
  84                         fputs("^fg(green)", stdout);
  85         }
  86
  87         batt_time = (float)batt_now / (float)batt_current;
  88         batt_watts = ((float)batt_voltage / 1000000) * ((float)batt_current / 10000000);
  89
  90         if (batt_watts == 0)    // fully charged and not in use
  91                 printf(" %s: %d%% _ _ ", batname, batt_percent);
  92         else
  93                 printf(" %s: %d%% %.1fh %.1fW ",
  94                         batname, batt_percent, batt_time, batt_watts);
  95 }