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/*
* Stupid status bar.
* Written by Runxi Yu.
* SPDX-License-Identifier: CC0-1.0
*/
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
#define MAXLEN 7
time_t t;
char buf[MAXLEN + 2];
char buf2[MAXLEN + 2];
size_t len, len2;
struct tm td;
int fdt, fds, fdc;
time_t t1;
int main()
{
fdt = open("/sys/class/power_supply/macsmc-battery/time_to_empty_now", O_RDONLY);
fdc = open("/sys/class/power_supply/macsmc-battery/capacity", O_RDONLY);
fds = open("/sys/class/power_supply/macsmc-battery/status", O_RDONLY);
if (fdt == -1 || fds == -1) {
fdt = open("/sys/class/power_supply/BAT0/time_to_empty_now", O_RDONLY);
fdc = open("/sys/class/power_supply/BAT0/capacity", O_RDONLY);
fds = open("/sys/class/power_supply/BAT0/status", O_RDONLY);
}
if (fdt == -1 || fds == -1) {
// no battery
for (;;) {
t = time(NULL);
td = *localtime(&t);
dprintf(STDOUT_FILENO,
"NOBAT %d-%02d-%02d %02d:%02d:%02d\n",
td.tm_year + 1900,
td.tm_mon + 1,
td.tm_mday,
td.tm_hour,
td.tm_min,
td.tm_sec
);
t = (t + 1) * 1000000;
for (t1 = time(NULL) * 1000000; t1 < t; t1 = time(NULL) * 1000000)
usleep(t - t1);
}
}
for (;;) {
// battery present
t = time(NULL);
td = *localtime(&t);
len = pread(fdc, buf + 1, MAXLEN, 0);
pread(fds, buf, 1, 0);
len2 = pread(fdt, buf2, MAXLEN, 0);
buf[len] = '\0';
buf2[len2-1] = '\0';
dprintf(STDOUT_FILENO,
"%s.%s %d-%02d-%02d %02d:%02d:%02d\n",
buf,
buf2,
td.tm_year + 1900,
td.tm_mon + 1,
td.tm_mday,
td.tm_hour,
td.tm_min,
td.tm_sec
);
t = (t + 1) * 1000000;
for (t1 = time(NULL) * 1000000; t1 < t; t1 = time(NULL) * 1000000)
usleep(t - t1);
}
}
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