+static char buf[MAXLEN];
+
+static const char *
+bprintf(const char *fmt, ...)
+{
+ va_list ap;
+ size_t len;
+
+ va_start(ap, fmt);
+ len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+ va_end(ap);
+
+ if (len >= sizeof(buf))
+ buf[sizeof(buf)-1] = '\0';
+
+ return buf;
+}
+
+static const char *
+battery_perc(const char *bat)
+{
+ int n, perc;
+ char path[PATH_MAX];
+ FILE *fp;
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
+ fp = fopen(path, "r");
+ if (fp == NULL) {
+ warn("Failed to open file %s", path);
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%i", &perc);
+ fclose(fp);
+ if (n != 1)
+ return UNKNOWN_STR;
+
+ return bprintf("%d", perc);
+}
+
+static const char *
+battery_power(const char *bat)
+{
+ char path[PATH_MAX];
+ FILE *fp;
+ int n, watts;
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
+ fp = fopen(path, "r");
+ if (fp == NULL) {
+ warn("Failed to open file %s", path);
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%i", &watts);
+ fclose(fp);
+ if (n != 1)
+ return UNKNOWN_STR;
+
+ return bprintf("%d", (watts + 500000) / 1000000);
+}
+
+static const char *
+battery_state(const char *bat)
+{
+ FILE *fp;
+ struct {
+ char *state;
+ char *symbol;
+ } map[] = {
+ { "Charging", "+" },
+ { "Discharging", "-" },
+ { "Full", "=" },
+ { "Unknown", "/" },
+ };
+ size_t i;
+ int n;
+ char path[PATH_MAX], state[12];
+
+ snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
+ fp = fopen(path, "r");
+ if (fp == NULL) {
+ warn("Failed to open file %s", path);
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%12s", state);
+ fclose(fp);
+ if (n != 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 n, freq;
+ FILE *fp;
+
+ fp = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", "r");
+ if (fp == NULL) {
+ warn("Failed to open file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%i", &freq);
+ fclose(fp);
+ if (n != 1)
+ return UNKNOWN_STR;
+
+ return bprintf("%d", (freq + 500) / 1000);
+}
+
+static const char *
+cpu_perc(void)
+{
+ int n, perc;
+ long double a[4], b[4];
+ FILE *fp;
+
+ fp = fopen("/proc/stat", "r");
+ if (fp == NULL) {
+ warn("Failed to open file /proc/stat");
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+ fclose(fp);
+ if (n != 4)
+ return UNKNOWN_STR;
+
+ delay++;
+ sleep(delay);
+
+ fp = fopen("/proc/stat", "r");
+ if (fp == NULL) {
+ warn("Failed to open file /proc/stat");
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+ fclose(fp);
+ if (n != 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 n, num;
+ FILE *fp;
+
+ fp= fopen("/proc/sys/kernel/random/entropy_avail", "r");
+ if (fp == NULL) {
+ warn("Failed to open file /proc/sys/kernel/random/entropy_avail");
+ return UNKNOWN_STR;
+ }
+ n = fscanf(fp, "%d", &num);
+ fclose(fp);
+ if (n != 1)
+ return UNKNOWN_STR;
+
+ return bprintf("%d", num);
+}