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 chargeNow = 0;
  21         int chargeFull = -1;
  22         int chargePercent = -1;
  23         int battW = 1;
  24         int battV = 0;
  25         float battTime = -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         // Is the battery present?
  42         if (access(batpath, F_OK))
  43         {
  44                 //printf(" ^fg(grey)[%s] ", batname);
  45                 return;
  46         }
  47
  48
  49         // Get info
  50         strcpy(&batpath[batpathlen], "/energy_now");
  51         stlen = fileRead(stline, sizeof(stline), batpath);
  52         if (stlen > 0)
  53                 chargeNow = atoi(stline);
  54
  55         strcpy(&batpath[batpathlen], "/energy_full");
  56         stlen = fileRead(stline, sizeof(stline), batpath);
  57         if (stlen > 0)
  58                 chargeFull = atoi(stline);
  59
  60         strcpy(&batpath[batpathlen], "/power_now");
  61         stlen = fileRead(stline, sizeof(stline), batpath);
  62         if (stlen > 0)
  63                 battW = atoi(stline);
  64
  65         strcpy(&batpath[batpathlen], "/voltage_now");
  66         stlen = fileRead(stline, sizeof(stline), batpath);
  67         if (stlen > 0)
  68                 battV = atoi(stline);
  69
  70
  71         // Prettyprint
  72         if (chargeFull > 0)
  73                 chargePercent = chargeNow / (chargeFull / 100);
  74
  75         if (chargePercent <= 40) // 40
  76         {
  77                 if (chargePercent <= 25) // 25
  78                 {
  79                         if (chargePercent <= 10) // 10
  80                                 fputs("^fg(red)", stdout);
  81                         else // 11-25%
  82                                 fputs("^fg(orange)", stdout);
  83                 }
  84                 else // 26-40%
  85                         fputs("^fg(yellow)", stdout);
  86         }
  87         else
  88         {
  89                 if (chargePercent > 70) // 70
  90                         fputs("^fg(white)", stdout);
  91                 else // 41-70%
  92                         fputs("^fg(green)", stdout);
  93         }
  94
  95         battTime = (float)chargeNow / (float)battW;
  96
  97         if (battW == 0) // fully charged and not in use
  98                 printf(" %s: %d%% _ _ ",
  99                         batname, chargePercent);
 100         else
 101                 printf(" %s: %d%% %.1fh %.1fW ",
 102                         batname, chargePercent, battTime, (float)battW / 1000000.0);
 103 }