components/battery.c
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <string.h>
#include "../util.h"
#if defined(__linux__)
#include <inttypes.h>
#include <limits.h>
#include <unistd.h>
static const char *
pick(const char *bat, const char *f1, const char *f2, char *path,
size_t length)
{
if (esnprintf(path, length, f1, bat) > 0 &&
access(path, R_OK) == 0) {
return f1;
}
if (esnprintf(path, length, f2, bat) > 0 &&
access(path, R_OK) == 0) {
return f2;
}
return NULL;
}
const char *
battery_perc(const char *bat)
{
int perc;
char path[PATH_MAX];
if (esnprintf(path, sizeof(path),
"/sys/class/power_supply/%s/capacity",
bat) < 0) {
return NULL;
}
if (pscanf(path, "%d", &perc) != 1) {
return NULL;
}
return bprintf("%d", perc);
}
const char *
battery_state(const char *bat)
{
static struct {
char *state;
char *symbol;
} map[] = {
{ "Charging", "+" },
{ "Discharging", "-" },
};
size_t i;
char path[PATH_MAX], state[12];
if (esnprintf(path, sizeof(path),
"/sys/class/power_supply/%s/status",
bat) < 0) {
return NULL;
}
if (pscanf(path, "%12s", state) != 1) {
return NULL;
}
for (i = 0; i < LEN(map); i++) {
if (!strcmp(map[i].state, state)) {
break;
}
}
return (i == LEN(map)) ? "?" : map[i].symbol;
}
const char *
battery_remaining(const char *bat)
{
uintmax_t charge_now, current_now, m, h;
double timeleft;
char path[PATH_MAX], state[12];
if (esnprintf(path, sizeof(path),
"/sys/class/power_supply/%s/status",
bat) < 0) {
return NULL;
}
if (pscanf(path, "%12s", state) != 1) {
return NULL;
}
if (!pick(bat, "/sys/class/power_supply/%s/charge_now",
"/sys/class/power_supply/%s/energy_now",
path, sizeof(path)) ||
pscanf(path, "%" PRIuMAX, &charge_now) < 0) {
return NULL;
}
if (!strcmp(state, "Discharging")) {
if (!pick(bat, "/sys/class/power_supply/%s/current_now",
"/sys/class/power_supply/%s/power_now", path,
sizeof(path)) ||
pscanf(path, "%" PRIuMAX, ¤t_now) < 0) {
return NULL;
}
if (current_now == 0) {
return NULL;
}
timeleft = (double)charge_now / (double)current_now;
h = timeleft;
m = (timeleft - (double)h) * 60;
return bprintf("%" PRIuMAX "h %" PRIuMAX "m", h, m);
}
return "";
}
#elif defined(__OpenBSD__)
#include <fcntl.h>
#include <machine/apmvar.h>
#include <sys/ioctl.h>
#include <unistd.h>
static int
load_apm_power_info(struct apm_power_info *apm_info)
{
int fd;
fd = open("/dev/apm", O_RDONLY);
if (fd < 0) {
warn("open '/dev/apm':");
return 0;
}
memset(apm_info, 0, sizeof(struct apm_power_info));
if (ioctl(fd, APM_IOC_GETPOWER, apm_info) < 0) {
warn("ioctl 'APM_IOC_GETPOWER':");
close(fd);
return 0;
}
return close(fd), 1;
}
const char *
battery_perc(const char *unused)
{
struct apm_power_info apm_info;
if (load_apm_power_info(&apm_info)) {
return bprintf("%d", apm_info.battery_life);
}
return NULL;
}
const char *
battery_state(const char *unused)
{
struct {
unsigned int state;
char *symbol;
} map[] = {
{ APM_AC_ON, "+" },
{ APM_AC_OFF, "-" },
};
struct apm_power_info apm_info;
size_t i;
if (load_apm_power_info(&apm_info)) {
for (i = 0; i < LEN(map); i++) {
if (map[i].state == apm_info.ac_state) {
break;
}
}
return (i == LEN(map)) ? "?" : map[i].symbol;
}
return NULL;
}
const char *
battery_remaining(const char *unused)
{
struct apm_power_info apm_info;
if (load_apm_power_info(&apm_info)) {
if (apm_info.ac_state != APM_AC_ON) {
return bprintf("%uh %02um",
apm_info.minutes_left / 60,
apm_info.minutes_left % 60);
} else {
return "";
}
}
return NULL;
}
#endif