get_battery_percentage_netbsd

get_battery_percentage_netbsd.c

/* taken from defora */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/envsys.h>
#include <fcntl.h>
#include <paths.h>
#include <unistd.h>

static int _get_tre(int fd, int sensor, envsys_tre_data_t * tre) {
        memset(tre, 0, sizeof(*tre));
        tre->sensor = sensor;
        if (ioctl(fd, ENVSYS_GTREDATA, tre) == -1)
                return 1;
        return !(tre->validflags & ENVSYS_FVALID);
}

int main (void) {
        int i;
        int fd = -1;
        double level;
        envsys_basic_info_t info;
        envsys_tre_data_t tre;
        unsigned int rate = 0;
        unsigned int charge = 0;
        unsigned int maxcharge = 0;
        bool charging;

        charging = false;
        if(fd < 0 && (fd = open(_PATH_SYSMON, O_RDONLY)) < 0)
        {
                printf("%s: %s",  _PATH_SYSMON,
                                strerror(errno));
                level = -1.0;
                return true;
        }
        for(i = 0; i >= 0; i++)
        {
                memset(&info, 0, sizeof(info));
                info.sensor = i;
                if(ioctl(fd, ENVSYS_GTREINFO, &info) == -1)
                {
                        close(fd);
                        fd = -1;
                        printf("%s: %s", "ENVSYS_GTREINFO",
                                        strerror(errno));
                        level = -1.0;
                        return true;
                }
                if(!(info.validflags & ENVSYS_FVALID))
                        break;
                if(strncmp("acpibat", info.desc, 7) != 0
                                || info.desc[7] == '\0'
                                || info.desc[8] != ' ')
                        continue;
                if(strcmp("charge", &info.desc[9]) == 0
                                && _get_tre(fd, i, &tre) == 0
                                && tre.validflags & ENVSYS_FCURVALID
                                && tre.validflags & ENVSYS_FMAXVALID)
                {
                        charge += tre.cur.data_us;
                        maxcharge += tre.max.data_us;
                }
                else if(strcmp("charge rate", &info.desc[9]) == 0
                                && _get_tre(fd, i, &tre) == 0
                                && tre.validflags & ENVSYS_FCURVALID)
                        rate += tre.cur.data_us;
                else if(strcmp("charging", &info.desc[9]) == 0
                                && _get_tre(fd, i, &tre) == 0
                                && tre.validflags & ENVSYS_FCURVALID
                                && tre.cur.data_us > 0)
                {
                        charging = true;
                        continue;
                }
                else if(strcmp("discharge rate", &info.desc[9]) == 0
                                && _get_tre(fd, i, &tre) == 0
                                && tre.validflags & ENVSYS_FCURVALID)
                        rate += tre.cur.data_us;
        }
        level = (charge * 100.0) / maxcharge;
        printf("%.f%%\n", level);
        return 0;
}