+ if (len >= sizeof(buf))
+ buf[sizeof(buf)-1] = '\0';
+
+ return buf;
+}
+
+int
+pscanf(const char *path, const char *fmt, ...)
+{
+ FILE *fp;
+ va_list ap;
+ int n;
+
+ if (!(fp = fopen(path, "r"))) {
+ warn("fopen %s: %s\n", path, strerror(errno));
+ return -1;
+ }
+ va_start(ap, fmt);
+ n = vfscanf(fp, fmt, ap);
+ va_end(ap);
+ fclose(fp);
+
+ return (n == EOF) ? -1 : n;
+}
+
+static const char *
+battery_perc(const char *bat)
+{
+ int perc;
+ char path[PATH_MAX];
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
+ return (pscanf(path, "%i", &perc) == 1) ?
+ bprintf("%d", perc) : unknown_str;
+}
+
+static const char *
+battery_power(const char *bat)
+{
+ int watts;
+ char path[PATH_MAX];
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
+ return (pscanf(path, "%i", &watts) == 1) ?
+ bprintf("%d", (watts + 500000) / 1000000) : unknown_str;
+}
+
+static const char *
+battery_state(const char *bat)
+{
+ struct {
+ char *state;
+ char *symbol;
+ } map[] = {
+ { "Charging", "+" },
+ { "Discharging", "-" },
+ { "Full", "=" },
+ { "Unknown", "/" },
+ };
+ size_t i;
+ char path[PATH_MAX], state[12];
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
+ if (pscanf(path, "%12s", state) != 1) {
+ return unknown_str;
+ }
+
+ for (i = 0; i < LEN(map); i++) {
+ if (!strcmp(map[i].state, state)) {
+ break;
+ }
+ }
+ return (i == LEN(map)) ? "?" : map[i].symbol;
+}
+
+static const char *
+cpu_freq(void)
+{
+ int freq;
+
+ return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
+ "%i", &freq) != 1) ?
+ bprintf("%d", (freq + 500) / 1000) : unknown_str;
+}
+
+static const char *
+cpu_perc(void)
+{
+ struct timespec delay;
+ int perc;
+ long double a[4], b[4];
+
+ if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
+ &a[3]) != 4) {
+ return unknown_str;
+ }
+
+ delay.tv_sec = (interval / 2) / 1000;
+ delay.tv_nsec = ((interval / 2) % 1000) * 1000000;
+ nanosleep(&delay, NULL);
+
+ if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2],
+ &b[3]) != 4) {
+ return unknown_str;
+ }
+
+ perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) /
+ ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
+
+ return bprintf("%d", perc);
+}
+
+static const char *
+datetime(const char *fmt)
+{
+ time_t t;
+
+ t = time(NULL);
+ if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
+ return unknown_str;
+
+ return buf;
+}
+
+static const char *
+disk_free(const char *mnt)
+{
+ struct statvfs fs;
+
+ if (statvfs(mnt, &fs) < 0) {
+ warn("Failed to get filesystem info");
+ return unknown_str;
+ }
+
+ return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+}
+
+static const char *
+disk_perc(const char *mnt)
+{
+ int perc;
+ struct statvfs fs;
+
+ if (statvfs(mnt, &fs) < 0) {
+ warn("Failed to get filesystem info");
+ return unknown_str;
+ }
+
+ perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+
+ return bprintf("%d", perc);
+}
+
+static const char *
+disk_total(const char *mnt)
+{
+ struct statvfs fs;
+
+ if (statvfs(mnt, &fs) < 0) {
+ warn("Failed to get filesystem info");
+ return unknown_str;
+ }
+
+ return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+}
+
+static const char *
+disk_used(const char *mnt)
+{
+ struct statvfs fs;
+
+ if (statvfs(mnt, &fs) < 0) {
+ warn("Failed to get filesystem info");
+ return unknown_str;
+ }
+
+ return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+}
+
+static const char *
+entropy(void)
+{
+ int num;
+
+ return (pscanf("/proc/sys/kernel/random/entropy_avail", "%d", &num) == 1) ?
+ bprintf("%d", num) : unknown_str;
+}
+
+static const char *
+gid(void)
+{
+ return bprintf("%d", getgid());
+}
+
+static const char *
+hostname(void)
+{
+ if (gethostname(buf, sizeof(buf)) == -1) {
+ warn("hostname");
+ return unknown_str;
+ }
+
+ return buf;
+}
+
+static const char *
+ip(const char *iface)
+{
+ struct ifaddrs *ifaddr, *ifa;
+ int s;
+ char host[NI_MAXHOST];
+
+ if (getifaddrs(&ifaddr) == -1) {
+ warn("Failed to get IP address for interface %s", iface);
+ return unknown_str;
+ }
+
+ for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+ if (ifa->ifa_addr == NULL) {
+ continue;
+ }
+ s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+ if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
+ if (s != 0) {
+ warnx("Failed to get IP address for interface %s", iface);
+ return unknown_str;
+ }
+ return bprintf("%s", host);
+ }
+ }
+
+ freeifaddrs(ifaddr);
+
+ return unknown_str;
+}
+
+static const char *
+kernel_release(void)
+{
+ struct utsname udata;
+
+ if (uname(&udata) < 0) {
+ return unknown_str;
+ }
+
+ return bprintf("%s", udata.release);
+}
+
+static const char *
+keyboard_indicators(void)
+{
+ Display *dpy = XOpenDisplay(NULL);
+ XKeyboardState state;
+
+ if (dpy == NULL) {
+ warnx("XOpenDisplay failed");
+ return unknown_str;
+ }
+ XGetKeyboardControl(dpy, &state);
+ XCloseDisplay(dpy);
+
+ switch (state.led_mask) {
+ case 1:
+ return "c";
+ case 2:
+ return "n";
+ case 3:
+ return "cn";
+ default:
+ return "";
+ }
+}
+
+static const char *
+load_avg(void)
+{
+ double avgs[3];
+
+ if (getloadavg(avgs, 3) < 0) {
+ warnx("Failed to get the load avg");
+ return unknown_str;
+ }
+
+ return bprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
+}
+
+static const char *
+num_files(const char *dir)
+{
+ struct dirent *dp;
+ DIR *fd;
+ int num = 0;
+
+ if ((fd = opendir(dir)) == NULL) {
+ warn("Failed to get number of files in directory %s", dir);
+ return unknown_str;
+ }
+
+ while ((dp = readdir(fd)) != NULL) {
+ if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
+ continue; /* skip self and parent */
+ num++;
+ }
+
+ closedir(fd);
+
+ return bprintf("%d", num);
+}
+
+static const char *
+ram_free(void)
+{
+ long free;
+
+ return (pscanf("/proc/meminfo", "MemFree: %ld kB\n", &free) == 1) ?
+ bprintf("%f", (float)free / 1024 / 1024) : unknown_str;
+}
+
+static const char *
+ram_perc(void)
+{
+ long total, free, buffers, cached;
+
+ return (pscanf("/proc/meminfo",
+ "MemTotal: %ld kB\n"
+ "MemFree: %ld kB\n"
+ "MemAvailable: %ld kB\nBuffers: %ld kB\n"
+ "Cached: %ld kB\n",
+ &total, &free, &buffers, &buffers, &cached) == 5) ?
+ bprintf("%d", 100 * ((total - free) - (buffers + cached)) / total) :
+ unknown_str;
+}
+
+static const char *
+ram_total(void)
+{
+ long total;