components/battery.c
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/* See LICENSE file for copyright and license details. */ #include <errno.h> #include <stdio.h> #include <string.h> #include "../util.h" #if defined(__linux__) #include <limits.h> #include <unistd.h> #define CHARGE_NOW "/sys/class/power_supply/%s/charge_now" #define ENERGY_NOW "/sys/class/power_supply/%s/energy_now" #define CURRENT_NOW "/sys/class/power_supply/%s/current_now" #define POWER_NOW "/sys/class/power_supply/%s/power_now" 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) { int 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, CHARGE_NOW, ENERGY_NOW, path, sizeof(path)) || pscanf(path, "%d", &charge_now) < 0) { return NULL; } if (!strcmp(state, "Discharging")) { if (!pick(bat, CURRENT_NOW, POWER_NOW, path, sizeof(path)) || pscanf(path, "%d", ¤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("%dh %dm", 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