X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/21afb5a8f835a3b6607615f7bb14c3270269b2da..825141633bad2264c67c38ebcaab63f4c96631d3:/slstatus.c

diff --git a/slstatus.c b/slstatus.c
index 8ec68a4..d360977 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,414 +1,677 @@
 /* See LICENSE file for copyright and license details. */
 
-/* global libraries */
 #include <alsa/asoundlib.h>
 #include <fcntl.h>
-#include <locale.h>
+#include <ifaddrs.h>
+#include <limits.h>
+#include <linux/wireless.h>
+#include <netdb.h>
+#include <pwd.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
+#include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
+#include <sys/socket.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 
-/* local libraries */
-#include "config.h"
+#undef strlcat
+#undef strlcpy
+
+#include "strlcat.h"
+#include "strlcpy.h"
+
+struct arg {
+	char *(*func)();
+	const char *format;
+	const char *args;
+};
+
+static void setstatus(const char *);
+static char *smprintf(const char *, ...);
+static char *battery_perc(const char *);
+static char *cpu_perc(void);
+static char *datetime(const char *);
+static char *disk_free(const char *);
+static char *disk_perc(const char *);
+static char *disk_total(const char *);
+static char *disk_used(const char *);
+static char *entropy(void);
+static char *gid(void);
+static char *hostname(void);
+static char *ip(const char *);
+static char *load_avg(void);
+static char *ram_free(void);
+static char *ram_perc(void);
+static char *ram_used(void);
+static char *ram_total(void);
+static char *run_command(const char *);
+static char *temp(const char *);
+static char *uid(void);
+static char *uptime(void);
+static char *username(void);
+static char *vol_perc(const char *);
+static char *wifi_perc(const char *);
+static char *wifi_essid(const char *);
 
-/* check file macro */
-#define CHECK_FILE(X,Y) do { \
-    if (stat(X,&Y) < 0) return -1; \
-    if (!S_ISREG(Y.st_mode)) return -1; \
-} while (0);
-
-/* functions */
-int config_check();
-void setstatus(char *str);
-char *smprintf(char *fmt, ...);
-char *get_battery();
-char *get_cpu_temperature();
-char *get_cpu_usage();
-char *get_datetime();
-char *get_diskusage();
-char *get_ram_usage();
-char *get_volume();
-char *get_wifi_signal();
-
-/* global variables */
 static Display *dpy;
 
-/* check configured paths */
-int
-config_check()
+#include "config.h"
+
+static void
+setstatus(const char *str)
 {
-    struct stat fs;
+	/* set WM_NAME via X11 */
+	XStoreName(dpy, DefaultRootWindow(dpy), str);
+	XSync(dpy, False);
+}
+
+static char *
+smprintf(const char *fmt, ...)
+{
+	va_list ap;
+	char *ret;
+	int len;
 
-    /* check all files in the config.h file */
-    CHECK_FILE(batterynowfile, fs);
-    CHECK_FILE(batteryfullfile, fs);
-    CHECK_FILE(tempfile, fs);
+	va_start(ap, fmt);
+	len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
 
-    /* check update interval */
-    if (update_interval < 1)
-        return -1;
+	ret = malloc(++len);
+	if (ret == NULL) {
+		perror("malloc");
+		exit(1);
+	}
 
-    /* exit successfully */
-    return 0;
+	va_start(ap, fmt);
+	vsnprintf(ret, len, fmt, ap);
+	va_end(ap);
+
+	return ret;
 }
 
-/* set statusbar (WM_NAME) */
-void
-setstatus(char *str)
+static char *
+battery_perc(const char *battery)
 {
-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
+	int now, full, perc;
+	char batterynowfile[64];
+	char batteryfullfile[64];
+	FILE *fp;
+
+	strlcpy(batterynowfile, BATTERY_PATH, sizeof(batterynowfile));
+	strlcat(batterynowfile, battery, sizeof(batterynowfile));
+	strlcat(batterynowfile, "/", sizeof(batterynowfile));
+	strlcat(batterynowfile, BATTERY_NOW, sizeof(batterynowfile));
+
+	strlcpy(batteryfullfile, BATTERY_PATH, sizeof(batteryfullfile));
+	strlcat(batteryfullfile, battery, sizeof(batteryfullfile));
+	strlcat(batteryfullfile, "/", sizeof(batteryfullfile));
+	strlcat(batteryfullfile, BATTERY_FULL, sizeof(batteryfullfile));
+
+	fp = fopen(batterynowfile, "r");
+	if (fp == NULL ) {
+		fprintf(stderr, "Error opening battery file: %s: %s\n",
+						batterynowfile,
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%i", &now);
+	fclose(fp);
+
+	fp = fopen(batteryfullfile, "r");
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening battery file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%i", &full);
+	fclose(fp);
+
+	perc = now / (full / 100);
+
+	return smprintf("%d%%", perc);
 }
 
-/* smprintf function */
-char *
-smprintf(char *fmt, ...)
+static char *
+cpu_perc(void)
 {
-    va_list fmtargs;
-    char *ret = NULL;
-    va_start(fmtargs, fmt);
-    if (vasprintf(&ret, fmt, fmtargs) < 0)
-        return NULL;
-    va_end(fmtargs);
-
-    return ret;
+	int perc;
+	long double a[4], b[4];
+	FILE *fp = fopen("/proc/stat","r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening stat file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+	fclose(fp);
+
+	/* wait a second (for avg values) */
+	sleep(1);
+
+	fp = fopen("/proc/stat","r");
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening stat file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+	fclose(fp);
+	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 smprintf("%d%%", perc);
 }
 
-/* battery percentage */
-char *
-get_battery()
+static char *
+datetime(const char *timeformat)
 {
-    int now, full, perc;
-    FILE *fp;
+	time_t t;
+	char timestr[80];
+
+	t = time(NULL);
+	if (strftime(timestr, sizeof(timestr), timeformat, localtime(&t)) == 0)
+		return smprintf(UNKNOWN_STR);
 
-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
+	return smprintf("%s", timestr);
+}
 
-    /* read value */
-    fscanf(fp, "%i", &now);
+static char *
+disk_free(const char *mountpoint)
+{
+	struct statvfs fs;
+
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+}
 
-    /* close battery now file */
-    fclose(fp);
+static char *
+disk_perc(const char *mountpoint)
+{
+	int perc = 0;
+	struct statvfs fs;
 
-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
 
-    /* read value */
-    fscanf(fp, "%i", &full);
+	perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+	return smprintf("%d%%", perc);
+}
 
-    /* close battery full file */
-    fclose(fp);
+static char *
+disk_total(const char *mountpoint)
+{
+	struct statvfs fs;
 
-    /* calculate percent */
-    perc = now / (full / 100);
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 }
 
-/* cpu temperature */
-char *
-get_cpu_temperature()
+static char *
+disk_used(const char *mountpoint)
 {
-    int temperature;
-    FILE *fp;
+	struct statvfs fs;
 
-    /* open temperature file */
-    if (!(fp = fopen(tempfile, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        return smprintf("n/a");
-    }
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
 
-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+	return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+}
 
-    /* close temperature file */
-    fclose(fp);
+static char *
+entropy(void)
+{
+	int entropy = 0;
+	FILE *fp = fopen("/proc/sys/kernel/random/entropy_avail", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Could not open entropy file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%d", &entropy);
+	fclose(fp);
+	return smprintf("%d", entropy);
+}
 
-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+static char *
+gid(void)
+{
+	gid_t gid = getgid();
+	return smprintf("%d", gid);
 }
 
-/* cpu percentage */
-char *
-get_cpu_usage()
+static char *
+hostname(void)
 {
-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+	char hostname[HOST_NAME_MAX];
+	FILE *fp = fopen("/proc/sys/kernel/hostname", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Could not open hostname file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fgets(hostname, sizeof(hostname), fp);
+	/* FIXME: needs improvement */
+	memset(&hostname[strlen(hostname)-1], '\0',
+		sizeof(hostname) - strlen(hostname));
+	fclose(fp);
+	return smprintf("%s", hostname);
+}
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+static char *
+ip(const char *interface)
+{
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
+
+	if (getifaddrs(&ifaddr) == -1) {
+		fprintf(stderr, "Error getting IP address: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	/* get the ip address */
+	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, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
+			if (s != 0) {
+				fprintf(stderr, "Error getting IP address.\n");
+				return smprintf(UNKNOWN_STR);
+			}
+			return smprintf("%s", host);
+		}
+	}
+
+	/* free the address */
+	freeifaddrs(ifaddr);
+
+	return smprintf(UNKNOWN_STR);
+}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+static char *
+load_avg(void)
+{
+	double avgs[3];
 
-    /* close stat file */
-    fclose(fp);
+	if (getloadavg(avgs, 3) < 0) {
+		fprintf(stderr, "Error getting load avg.\n");
+		return smprintf(UNKNOWN_STR);
+	}
 
-    /* wait a second (for avg values) */
-    sleep(1);
+	return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
+}
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+static char *
+ram_free(void)
+{
+	long free;
+	FILE *fp = fopen("/proc/meminfo", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening meminfo file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fclose(fp);
+	return smprintf("%f", (float)free / 1024 / 1024);
+}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+static char *
+ram_perc(void)
+{
+	int perc;
+	long total, free, buffers, cached;
+	FILE *fp = fopen("/proc/meminfo", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening meminfo file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
+
+	fclose(fp);
+	perc = 100 * ((total - free) - (buffers + cached)) / total;
+	return smprintf("%d%%", perc);
+}
 
-    /* close stat file */
-    fclose(fp);
+static char *
+ram_total(void)
+{
+	long total;
+	FILE *fp = fopen("/proc/meminfo", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening meminfo file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fclose(fp);
+	return smprintf("%f", (float)total / 1024 / 1024);
+}
 
-    /* calculate avg in this second */
-    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]));
+static char *
+ram_used(void)
+{
+	long free, total, buffers, cached, used;
+	FILE *fp = fopen("/proc/meminfo", "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening meminfo file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
+	fscanf(fp, "MemFree: %ld kB\n", &free);
+	fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
+	fscanf(fp, "Cached: %ld kB\n", &cached);
+
+	fclose(fp);
+	used = total - free - buffers - cached;
+	return smprintf("%f", (float)used / 1024 / 1024);
+}
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+static char *
+run_command(const char* command)
+{
+	int good;
+	FILE *fp = popen(command, "r");
+	char buffer[64];
+
+	if (fp == NULL) {
+		fprintf(stderr, "Could not get command output for: %s: %s\n",
+						command, strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fgets(buffer, sizeof(buffer)-1, fp);
+	pclose(fp);
+	for (int i = 0 ; i != sizeof(buffer); i++) {
+		if (buffer[i] == '\0') {
+			good = 1;
+			break;
+		}
+	}
+	if (good)
+		buffer[strlen(buffer)-1] = '\0';
+	return smprintf("%s", buffer);
 }
 
-/* date and time */
-char *
-get_datetime()
+static char *
+temp(const char *file)
 {
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
-
-    /* get time in format */
-    time(&tm);
-    setlocale(LC_TIME, "");
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-        setlocale(LC_TIME, "C");
-        fprintf(stderr, "Strftime failed.\n");
-        return smprintf("n/a");
-    }
-
-    setlocale(LC_TIME, "C");
-    /* return time */
-    return smprintf("%s", buf);
+	int temperature;
+	FILE *fp = fopen(file, "r");
+
+	if (fp == NULL) {
+		fprintf(stderr, "Could not open temperature file: %s\n",
+							strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fscanf(fp, "%d", &temperature);
+	fclose(fp);
+	return smprintf("%d°C", temperature / 1000);
 }
 
-/* disk usage percentage */
-char *
-get_diskusage()
+static char *
+uptime(void)
 {
-    struct statvfs fs;
-    float perc = 0;
-    if (statvfs(mountpath, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
-    perc = 1.0f - ((float)fs.f_bavail/(float)fs.f_blocks);
-    return smprintf("%2f%%", perc);
+	struct sysinfo info;
+	int hours = 0;
+	int minutes = 0;
+
+	sysinfo(&info);
+	hours = info.uptime / 3600;
+	minutes = (info.uptime - hours * 3600 ) / 60;
+
+	return smprintf("%dh %dm", hours, minutes);
+}
+
+static char *
+username(void)
+{
+	/* FIXME: WHY USE REGISTER MODIFIER? */
+	register struct passwd *pw;
+	register uid_t uid;
+
+	uid = geteuid();
+	pw = getpwuid(uid);
+
+	if (pw)
+		return smprintf("%s", pw->pw_name);
+	else {
+		fprintf(stderr, "Could not get username: %s\n",
+					strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	return smprintf(UNKNOWN_STR);
 }
 
-/* ram percentage */
-char *
-get_ram_usage()
+static char *
+uid(void)
+{
+	/* FIXME: WHY USE register modifier? */
+	register uid_t uid;
+
+	uid = geteuid();
+
+	if (uid)
+		return smprintf("%d", uid);
+	else {
+		fprintf(stderr, "Could not get uid.\n");
+		return smprintf(UNKNOWN_STR);
+	}
+
+	return smprintf(UNKNOWN_STR);
+}
+
+
+static char *
+vol_perc(const char *soundcard)
 {
-    int perc;
-    long total, free, buffers, cached;
-    FILE *fp;
-
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
-
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
-    fscanf(fp, "MemFree: %ld kB\n", &free);
-    fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
-    fscanf(fp, "Cached: %ld kB\n", &cached);
-
-    /* close meminfo file */
-    fclose(fp);
-
-    /* calculate percentage */
-    perc = 100 * ((total - free) - (buffers + cached)) / total;
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	/*
+	 * TODO: FIXME: 
+	 * https://github.com/drkh5h/slstatus/issues/12
+	 */
+	int mute = 0;
+	long vol = 0, max = 0, min = 0;
+	snd_mixer_t *handle;
+	snd_mixer_elem_t *pcm_mixer, *mas_mixer;
+	snd_mixer_selem_id_t *vol_info, *mute_info;
+
+	snd_mixer_open(&handle, 0);
+	snd_mixer_attach(handle, soundcard);
+	snd_mixer_selem_register(handle, NULL, NULL);
+	snd_mixer_load(handle);
+
+	snd_mixer_selem_id_malloc(&vol_info);
+	snd_mixer_selem_id_malloc(&mute_info);
+	if (vol_info == NULL || mute_info == NULL) {
+		fprintf(stderr, "Could not get alsa volume.\n");
+		return smprintf(UNKNOWN_STR);
+	}
+	snd_mixer_selem_id_set_name(vol_info, ALSA_CHANNEL);
+	snd_mixer_selem_id_set_name(mute_info, ALSA_CHANNEL);
+	pcm_mixer = snd_mixer_find_selem(handle, vol_info);
+	mas_mixer = snd_mixer_find_selem(handle, mute_info);
+
+	snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
+	snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
+	snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
+
+	if (vol_info)
+		snd_mixer_selem_id_free(vol_info);
+	if (mute_info)
+		snd_mixer_selem_id_free(mute_info);
+	if (handle)
+		snd_mixer_close(handle);
+
+	if (!mute)
+		return smprintf("mute");
+	else
+		return smprintf("%d%%", (vol * 100) / max);
 }
 
-/* alsa volume percentage */
-char *
-get_volume()
+static char *
+wifi_perc(const char *wificard)
 {
-    int mute = 0;
-    long vol = 0, max = 0, min = 0;
-
-    /* get volume from alsa */
-    snd_mixer_t *handle;
-    snd_mixer_elem_t *pcm_mixer, *mas_mixer;
-    snd_mixer_selem_id_t *vol_info, *mute_info;
-    snd_mixer_open(&handle, 0);
-    snd_mixer_attach(handle, soundcard);
-    snd_mixer_selem_register(handle, NULL, NULL);
-    snd_mixer_load(handle);
-    snd_mixer_selem_id_malloc(&vol_info);
-    snd_mixer_selem_id_malloc(&mute_info);
-    snd_mixer_selem_id_set_name(vol_info, channel);
-    snd_mixer_selem_id_set_name(mute_info, channel);
-    pcm_mixer = snd_mixer_find_selem(handle, vol_info);
-    mas_mixer = snd_mixer_find_selem(handle, mute_info);
-    snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
-    snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
-    snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
-    if (vol_info)
-        snd_mixer_selem_id_free(vol_info);
-    if (mute_info)
-        snd_mixer_selem_id_free(mute_info);
-    if (handle)
-        snd_mixer_close(handle);
-
-    /* return the string (mute) */
-    if (!mute)
-        return smprintf("mute");
-    else
-        return smprintf("%d%%", (vol * 100) / max);
+	int strength;
+	char buf[255];
+	char *datastart;
+	char path[64];
+	char status[5];
+	char needle[strlen(wificard)+2];
+	FILE *fp;
+
+	strlcpy(path, "/sys/class/net/", sizeof(path));
+	strlcat(path, wificard, sizeof(path));
+	strlcat(path, "/operstate", sizeof(path));
+
+	fp = fopen(path, "r");
+
+	if(fp == NULL) {
+		fprintf(stderr, "Error opening wifi operstate file: %s\n",
+							strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	fgets(status, 5, fp);
+	fclose(fp);
+	if(strcmp(status, "up\n") != 0)
+		return smprintf(UNKNOWN_STR);
+
+	fp = fopen("/proc/net/wireless", "r");
+	if (fp == NULL) {
+		fprintf(stderr, "Error opening wireless file: %s\n",
+						strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	strlcpy(needle, wificard, sizeof(needle));
+	strlcat(needle, ":", sizeof(needle));
+	fgets(buf, sizeof(buf), fp);
+	fgets(buf, sizeof(buf), fp);
+	fgets(buf, sizeof(buf), fp);
+
+	datastart = strstr(buf, needle);
+	if (datastart != NULL) {
+		datastart = strstr(buf, ":");
+		sscanf(datastart + 1, " %*d   %d  %*d  %*d		  %*d	   %*d		%*d		 %*d	  %*d		 %*d", &strength);
+	}
+
+	fclose(fp);
+	return smprintf("%d%%", strength);
 }
 
-/* wifi percentage */
-char *
-get_wifi_signal()
+static char *
+wifi_essid(const char *wificard)
 {
-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path_start[16] = "/sys/class/net/";
-    char path_end[11] = "/operstate";
-    char path[32];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
-
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, path_start);
-    strcat(path, wificard);
-    strcat(path, path_end);
-
-    /* open wifi file */
-    if(!(fp = fopen(path, "r"))) {
-        fprintf(stderr, "Error opening wifi operstate file.");
-        return smprintf("n/a");
-    }
-
-    /* read the status */
-    fgets(status, 5, fp);
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* check if interface down */
-    if(strcmp(status, "up\n") != 0){
-        return smprintf("n/a");
-    }
-
-    /* open wifi file */
-    if (!(fp = fopen("/proc/net/wireless", "r"))) {
-        fprintf(stderr, "Error opening wireless file.");
-        return smprintf("n/a");
-    }
-
-    /* extract the signal strength */
-    strcpy(needle, wificard);
-    strcat(needle, ":");
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    if ((datastart = strstr(buf, needle)) != NULL) {
-        datastart = strstr(buf, ":");
-        sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
-    }
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* return strength in percent */
-    return smprintf("%d%%", strength);
+	char id[IW_ESSID_MAX_SIZE+1];
+	int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+	struct iwreq wreq;
+
+	memset(&wreq, 0, sizeof(struct iwreq));
+	wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
+	sprintf(wreq.ifr_name, wificard);
+	if(sockfd == -1) {
+		fprintf(stderr, "Cannot open socket for interface: %s: %s\n",
+						wificard, strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+	wreq.u.essid.pointer = id;
+	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+		fprintf(stderr, "Get ESSID ioctl failed for interface %s: %s\n",
+						wificard, strerror(errno));
+		return smprintf(UNKNOWN_STR);
+	}
+
+	if (strcmp((char *)wreq.u.essid.pointer, "") == 0)
+		return smprintf(UNKNOWN_STR);
+	else
+		return smprintf("%s", (char *)wreq.u.essid.pointer);
 }
 
-/* main function */
 int
-main()
+main(void)
 {
-    char status[1024];
-    char *battery = NULL;
-    char *cpu_temperature = NULL;
-    char *cpu_usage = NULL;
-    char *datetime = NULL;
-    char *diskusage = NULL;
-    char *ram_usage = NULL;
-    char *volume = NULL;
-    char *wifi_signal = NULL;
-
-    /* check config for sanity */
-    if (config_check() < 0) {
-        fprintf(stderr, "Config error, please check paths and interval and recompile!\n");
-        exit(1);
-    }
-
-    /* open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
-
-    /* return status every second */
-    for (;;) {
-        /* assign the values */
-        battery = get_battery();
-        cpu_temperature = get_cpu_temperature();
-        cpu_usage = get_cpu_usage();
-        datetime = get_datetime();
-        diskusage = get_diskusage();
-        ram_usage = get_ram_usage();
-        volume = get_volume();
-        wifi_signal = get_wifi_signal();
-
-        /* return the status */
-        sprintf(status, FORMATSTRING, ARGUMENTS);
-        setstatus(status);
-
-        /* free the values */
-        free(battery);
-        free(cpu_temperature);
-        free(cpu_usage);
-        free(datetime);
-        free(diskusage);
-        free(ram_usage);
-        free(volume);
-        free(wifi_signal);
-
-        /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
-        sleep(update_interval -1);
-    }
-
-    /* close display */
-    XCloseDisplay(dpy);
-
-    /* exit successfully */
-    return 0;
+	size_t i;
+	char status_string[4096];
+	char *res, *element;
+	struct arg argument;
+
+	dpy = XOpenDisplay(0x0);
+	if (!dpy) {
+		fprintf(stderr, "Cannot open display!\n");
+		exit(1);
+	}
+
+	for (;;) {
+		memset(status_string, 0, sizeof(status_string));
+		for (i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
+			argument = args[i];
+			if (argument.args == NULL)
+				res = argument.func();
+			else
+				res = argument.func(argument.args);
+			element = smprintf(argument.format, res);
+			if (element == NULL) {
+				element = smprintf(UNKNOWN_STR);
+				fprintf(stderr, "Failed to format output.\n");
+			}
+			strlcat(status_string, element, sizeof(status_string));
+			free(res);
+			free(element);
+		}
+
+		setstatus(status_string);
+		sleep(UPDATE_INTERVAL -1);
+	}
+
+	XCloseDisplay(dpy);
+	return 0;
 }