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#define _GNU_SOURCE
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xlib.h>
int stop = 0;
#ifdef BATTERY
int getnum(char *fn)
{
char buf[1024];
FILE *f;
int len;
f = fopen(fn, "r");
if (!f) {
return -1;
}
len = fread(buf, 1, 1023, f);
if (ferror(f)) {
return -1;
}
fclose(f);
if (len > 1022 || len < 1) {
return -1;
}
buf[1023] = '\0';
return atoi(buf);
}
#endif
void handler(int sig)
{
stop = sig;
}
int main(void)
{
struct tm *tm;
time_t now;
#ifdef BATTERY
long long curr, max, a=-1, b=-1, i;
char name[8 + 9]; /* (p)pp.pp% hh:mm:ss\0 */
char *perc = name;
char *clock = name + 8;
#else
char name[9]; /* hh:mm:ss\0 */
char *clock = name;
#endif
struct sigaction act;
Display *disp;
int screen;
Window root;
act.sa_handler = handler;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGQUIT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
disp = XOpenDisplay(NULL);
#ifdef BATTERY
for (i=0; !stop; ++i) {
#else
while (!stop) {
#endif
if (!disp) {
puts("Cannot open display!");
return 1;
}
screen = DefaultScreen(disp);
root = RootWindow(disp, screen);
#ifdef BATTERY
if (i % (BAT_REFRESH_SECONDS) == 0) {
curr = getnum(ENERGY_NOW) * MUL;
max = getnum(ENERGY_FULL);
if (curr < 0 || max < 1) {
a = b = -1;
} else {
a = curr * 10000 / max;
b = a % 100;
a /= 100;
}
}
if (a < 0 || b < 0) {
snprintf(perc, 8, "NO BAT ");
} else if (a < 0 || a > 999999 || b < 0 || b > 99) {
snprintf(perc, 8, "INVALID");
} else if (a > 999) {
snprintf(perc, 8, "%6lld%%", a);
} else {
snprintf(perc, 8, "%3lld.%02lld%%", a, b);
}
perc[7] = ' ';
#endif
now = time(NULL);
tm = localtime(&now);
strftime(clock, 9, "%H:%M:%S", tm);
XStoreName(disp, root, name);
XFlush(disp);
sleep(1);
}
XCloseDisplay(disp);
return 0;
}
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