Formatting commit :(

I know formatting commits suck... And I try to avoid them.

But this commit was absolutely necessary... The coding style in this
program was not ok and not the same over the whole program.

The commit is hard to read, but this is what I changed:
- Tabs for indentation instead of spaces
- Same style over the whole program (suckless style)

CONTRIBUTING.md

@@ -1,4 +1,4 @@
 Contributing
 ============
 
-If you want to contribute, please use [the suckless coding style](http://suckless.org/coding_style) and 4 spaces for indentation.
+If you want to contribute, please use [the suckless coding style](http://suckless.org/coding_style).

README.md

@@ -38,7 +38,7 @@ Put the following code in your ~/.xinitrc (or similar):
 
 ```
 while true; do
-    slstatus
+	slstatus
 done &
 ```
 

config.def.h

@@ -1,12 +1,12 @@
 /* See LICENSE file for copyright and license details. */
 
 /* alsa sound */
-static const char channel[]   = "Master";
+static const char channel[]         = "Master";
 
 /* battery */
-static const char batterypath[] = "/sys/class/power_supply/";
-static const char batterynow[]  = "energy_now";
-static const char batteryfull[] = "energy_full_design";
+static const char batterypath[]     = "/sys/class/power_supply/";
+static const char batterynow[]      = "energy_now";
+static const char batteryfull[]     = "energy_full_design";
 
 /* bar update interval in seconds (smallest value = 1) */
 static unsigned int update_interval = 1;
@@ -35,13 +35,13 @@ static unsigned int update_interval = 1;
 - wifi_perc (wifi signal in percent) [argument: wifi card interface name]
 - wifi_essid (wifi essid) [argument: wifi card interface name] */
 static const struct arg args[] = {
-    /* function     format          argument */
-    { wifi_perc,    "wifi %4s | ",  "wlp3s0" },
-    { battery_perc, "bat %4s | ",   "BAT0" },
-    { cpu_perc,     "cpu %4s ",     NULL },
-    { temp,         "%3s | ",       "/sys/devices/platform/coretemp.0/hwmon/hwmon2/temp1_input" },
-    { ram_perc,     "ram %3s | ",   NULL },
-    { vol_perc,     "vol %4s | ",   "default" },
-    { disk_perc,    "ssd %3s | ",   "/" },
-    { datetime,     "%s",           "%y-%m-%d %H:%M:%S" },
+	/* function     format          argument */
+	{ wifi_perc,    "wifi %4s | ",  "wlp3s0" },
+	{ battery_perc, "bat %4s | ",   "BAT0" },
+	{ cpu_perc,     "cpu %4s ",     NULL },
+	{ temp,         "%3s | ",       "/sys/devices/platform/coretemp.0/hwmon/hwmon2/temp1_input" },
+	{ ram_perc,     "ram %3s | ",   NULL },
+	{ vol_perc,     "vol %4s | ",   "default" },
+	{ disk_perc,    "ssd %3s | ",   "/" },
+	{ datetime,     "%s",           "%y-%m-%d %H:%M:%S" },
 };

slstatus.c

@@ -31,457 +31,455 @@
 void
 setstatus(const char *str)
 {
-    /* set WM_NAME via X11 */
-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
+	/* set WM_NAME via X11 */
+	XStoreName(dpy, DefaultRootWindow(dpy), str);
+	XSync(dpy, False);
 }
 
 /* smprintf function */
 char *
 smprintf(const char *fmt, ...)
 {
-    va_list fmtargs;
-    char *ret = NULL;
+	va_list fmtargs;
+	char *ret = NULL;
 
-    va_start(fmtargs, fmt);
-    if (vasprintf(&ret, fmt, fmtargs) < 0)
-        return NULL;
-    va_end(fmtargs);
+	va_start(fmtargs, fmt);
+	if (vasprintf(&ret, fmt, fmtargs) < 0) {
+		return NULL;
+	}
+	va_end(fmtargs);
 
-    return ret;
+	return ret;
 }
 
 /* battery percentage */
 char *
 battery_perc(const char *battery)
 {
-    int now, full, perc;
-    char batterynowfile[64] = "";
-    char batteryfullfile[64] = "";
-    FILE *fp;
-
-    /* generate battery nowfile path */
-    strcat(batterynowfile, batterypath);
-    strcat(batterynowfile, battery);
-    strcat(batterynowfile, "/");
-    strcat(batterynowfile, batterynow);
-
-    /* generate battery fullfile path */
-    strcat(batteryfullfile, batterypath);
-    strcat(batteryfullfile, battery);
-    strcat(batteryfullfile, "/");
-    strcat(batteryfullfile, batteryfull);
-
-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.%s",batterynowfile);
-        return smprintf("n/a");
-    }
-
-    /* read value */
-    fscanf(fp, "%i", &now);
-
-    /* close battery now file */
-    fclose(fp);
-
-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
-
-    /* read value */
-    fscanf(fp, "%i", &full);
-
-    /* close battery full file */
-    fclose(fp);
-
-    /* calculate percent */
-    perc = now / (full / 100);
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	int now, full, perc;
+	char batterynowfile[64] = "";
+	char batteryfullfile[64] = "";
+	FILE *fp;
+
+	/* generate battery nowfile path */
+	strcat(batterynowfile, batterypath);
+	strcat(batterynowfile, battery);
+	strcat(batterynowfile, "/");
+	strcat(batterynowfile, batterynow);
+
+	/* generate battery fullfile path */
+	strcat(batteryfullfile, batterypath);
+	strcat(batteryfullfile, battery);
+	strcat(batteryfullfile, "/");
+	strcat(batteryfullfile, batteryfull);
+
+	/* open battery now file */
+	if (!(fp = fopen(batterynowfile, "r"))) {
+		fprintf(stderr, "Error opening battery file.%s", batterynowfile);
+		return smprintf("n/a");
+	}
+
+	/* read value */
+	fscanf(fp, "%i", &now);
+
+	/* close battery now file */
+	fclose(fp);
+
+	/* open battery full file */
+	if (!(fp = fopen(batteryfullfile, "r"))) {
+		fprintf(stderr, "Error opening battery file.");
+		return smprintf("n/a");
+	}
+
+	/* read value */
+	fscanf(fp, "%i", &full);
+
+	/* close battery full file */
+	fclose(fp);
+
+	/* calculate percent */
+	perc = now / (full / 100);
+
+	/* return perc as string */
+	return smprintf("%d%%", perc);
 }
 
 /* cpu percentage */
 char *
 cpu_perc(const char *null)
 {
-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+	int perc;
+	long double a[4], b[4];
+	FILE *fp;
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+	/* open stat file */
+	if (!(fp = fopen("/proc/stat","r"))) {
+		fprintf(stderr, "Error opening stat file.");
+		return smprintf("n/a");
+	}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
+	/* read values */
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 
-    /* close stat file */
-    fclose(fp);
+	/* close stat file */
+	fclose(fp);
 
-    /* wait a second (for avg values) */
-    sleep(1);
+	/* wait a second (for avg values) */
+	sleep(1);
 
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
+	/* open stat file */
+	if (!(fp = fopen("/proc/stat","r"))) {
+		fprintf(stderr, "Error opening stat file.");
+		return smprintf("n/a");
+	}
 
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
+	/* read values */
+	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 
-    /* close stat file */
-    fclose(fp);
+	/* close stat file */
+	fclose(fp);
 
-    /* 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]));
+	/* 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]));
 
-    /* return perc as string */
-    return smprintf("%d%%", perc);
+	/* return perc as string */
+	return smprintf("%d%%", perc);
 }
 
 /* date and time */
 char *
 datetime(const char *timeformat)
 {
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
-    if (buf == NULL) {
-        fprintf(stderr, "Failed to get date/time");
-        return smprintf("n/a");
-    }
-
-    /* get time in format */
-    time(&tm);
-    setlocale(LC_TIME, "");
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-        setlocale(LC_TIME, "C");
-        free(buf);
-        fprintf(stderr, "Strftime failed.\n");
-        return smprintf("n/a");
-    }
-
-    setlocale(LC_TIME, "C");
-    /* return time */
-    char *ret = smprintf("%s", buf);
-    free(buf);
-    return ret;
+	time_t tm;
+	size_t bufsize = 64;
+	char *buf = malloc(bufsize);
+	if (buf == NULL) {
+		fprintf(stderr, "Failed to get date/time");
+		return smprintf("n/a");
+	}
+
+	/* get time in format */
+	time(&tm);
+	setlocale(LC_TIME, "");
+	if (!strftime(buf, bufsize, timeformat, localtime(&tm))) {
+		setlocale(LC_TIME, "C");
+		free(buf);
+		fprintf(stderr, "Strftime failed.\n");
+		return smprintf("n/a");
+	}
+
+	setlocale(LC_TIME, "C");
+	/* return time */
+	char *ret = smprintf("%s", buf);
+	free(buf);
+	return ret;
 }
 
 /* disk free */
 char *
 disk_free(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return free */
-    return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+	/* return free */
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 }
 
 /* disk usage percentage */
 char *
 disk_perc(const char *mountpoint)
 {
-    int perc = 0;
-    struct statvfs fs;
+	int perc = 0;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* calculate percent */
-    perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+	/* calculate percent */
+	perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
 
-    /* return perc */
-    return smprintf("%d%%", perc);
+	/* return perc */
+	return smprintf("%d%%", perc);
 }
 
 /* disk total */
 char *
 disk_total(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return total */
-    return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+	/* return total */
+	return smprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 }
 
 /* disk used */
 char *
 disk_used(const char *mountpoint)
 {
-    struct statvfs fs;
+	struct statvfs fs;
 
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
+	/* try to open mountpoint */
+	if (statvfs(mountpoint, &fs) < 0) {
+		fprintf(stderr, "Could not get filesystem info.\n");
+		return smprintf("n/a");
+	}
 
-    /* return used */
-    return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+	/* return used */
+	return smprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
 }
 
 /* entropy available */
 char *
 entropy(const char *null)
 {
-    int entropy = 0;
-    FILE *fp;
+	int entropy = 0;
+	FILE *fp;
 
-    /* open entropy file */
-    if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
-        fprintf(stderr, "Could not open entropy file.\n");
-        return smprintf("n/a");
-    }
+	/* open entropy file */
+	if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
+		fprintf(stderr, "Could not open entropy file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract entropy */
-    fscanf(fp, "%d", &entropy);
+	/* extract entropy */
+	fscanf(fp, "%d", &entropy);
 
-    /* close entropy file */
-    fclose(fp);
+	/* close entropy file */
+	fclose(fp);
 
-    /* return entropy */
-    return smprintf("%d", entropy);
+	/* return entropy */
+	return smprintf("%d", entropy);
 }
 
 /* gid */
 char *
 gid(const char *null)
 {
-    gid_t gid;
+	gid_t gid;
 
-    if ((gid = getgid()) < 0) {
-        fprintf(stderr, "Could no get gid.");
-        return smprintf("n/a");
-    } else {
-        return smprintf("%d", gid);
-    }
+	if ((gid = getgid()) < 0) {
+		fprintf(stderr, "Could no get gid.");
+		return smprintf("n/a");
+	} else {
+		return smprintf("%d", gid);
+	}
 
-    return smprintf("n/a");
+	return smprintf("n/a");
 }
 
 /* hostname */
 char *
 hostname(const char *null)
 {
-    char hostname[HOST_NAME_MAX];
-    FILE *fp;
+	char hostname[HOST_NAME_MAX];
+	FILE *fp;
 
-    /* open hostname file */
-    if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
-        fprintf(stderr, "Could not open hostname file.\n");
-        return smprintf("n/a");
-    }
+	/* open hostname file */
+	if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
+		fprintf(stderr, "Could not open hostname file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract hostname */
-    fscanf(fp, "%s\n", hostname);
+	/* extract hostname */
+	fscanf(fp, "%s\n", hostname);
 
-    /* close hostname file */
-    fclose(fp);
+	/* close hostname file */
+	fclose(fp);
 
-    /* return entropy */
-    return smprintf("%s", hostname);
+	/* return entropy */
+	return smprintf("%s", hostname);
 }
 
 /* ip address */
 char *
 ip(const char *interface)
 {
-    struct ifaddrs *ifaddr, *ifa;
-    int s;
-    char host[NI_MAXHOST];
-
-    /* check if getting ip address works */
-    if (getifaddrs(&ifaddr) == -1)
-    {
-        fprintf(stderr, "Error getting IP address.");
-        return smprintf("n/a");
-    }
-
-    /* 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.");
-                return smprintf("n/a");
-            }
-            return smprintf("%s", host);
-        }
-    }
-
-    /* free the address */
-    freeifaddrs(ifaddr);
-
-    /* return n/a if nothing works */
-    return smprintf("n/a");
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
+
+	/* check if getting ip address works */
+	if (getifaddrs(&ifaddr) == -1) {
+		fprintf(stderr, "Error getting IP address.");
+		return smprintf("n/a");
+	}
+
+	/* 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.");
+				return smprintf("n/a");
+			}
+			return smprintf("%s", host);
+		}
+	}
+
+	/* free the address */
+	freeifaddrs(ifaddr);
+
+	/* return n/a if nothing works */
+	return smprintf("n/a");
 }
 
 /* ram free */
 char *
 ram_free(const char *null)
 {
-    long free;
-    FILE *fp;
+	long free;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* open meminfo file */
+	if (!(fp = fopen("/proc/meminfo", "r"))) {
+		fprintf(stderr, "Error opening meminfo file.");
+		return smprintf("n/a");
+	}
 
-    /* read the values */
-    fscanf(fp, "MemFree: %ld kB\n", &free);
+	/* read the values */
+	fscanf(fp, "MemFree: %ld kB\n", &free);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* return free ram as string */
-    return smprintf("%f", (float)free / 1024 / 1024);
+	/* return free ram as string */
+	return smprintf("%f", (float)free / 1024 / 1024);
 }
 
 /* ram percentage */
 char *
 ram_perc(const char *null)
 {
-    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);
+	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);
 }
 
 /* ram total */
 char *
 ram_total(const char *null)
 {
-    long total;
-    FILE *fp;
+	long total;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* 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);
+	/* read the values */
+	fscanf(fp, "MemTotal: %ld kB\n", &total);
 
-    /* close meminfo file */
-    fclose(fp);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* return total ram as string */
-    return smprintf("%f", (float)total / 1024 / 1024);
+	/* return total ram as string */
+	return smprintf("%f", (float)total / 1024 / 1024);
 }
 
 /* ram used */
 char *
 ram_used(const char *null)
 {
-    long free, total, buffers, cached, used;
-    FILE *fp;
+	long free, total, buffers, cached, used;
+	FILE *fp;
 
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
+	/* 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);
+	/* 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);
+	/* close meminfo file */
+	fclose(fp);
 
-    /* calculate used */
-    used = total - free - buffers - cached;
+	/* calculate used */
+	used = total - free - buffers - cached;
 
-    /* return used ram as string */
-    return smprintf("%f", (float)used / 1024 / 1024);
+	/* return used ram as string */
+	return smprintf("%f", (float)used / 1024 / 1024);
 }
 
 /* custom shell command */
 char *
 run_command(const char* command)
 {
-    int good;
+	int good;
 	FILE *fp;
 	char buffer[64];
 
-    /* try to open the command output */
+	/* try to open the command output */
 	if (!(fp = popen(command, "r"))) {
-        fprintf(stderr, "Could not get command output for: %s.\n", command);
-        return smprintf("n/a");
-    }
+		fprintf(stderr, "Could not get command output for: %s.\n", command);
+		return smprintf("n/a");
+	}
 
-    /* get command output text, save it to buffer */
-	fgets(buffer, sizeof(buffer)-1, fp);
+	/* get command output text, save it to buffer */
+	fgets(buffer, sizeof(buffer) - 1, fp);
 
-    /* close it again */
+	/* close it again */
 	pclose(fp);
 
-    /* add nullchar at the end */
-    for (int i = 0 ; i != sizeof(buffer) ; i++) {
-        if (buffer[i] == '\0') {
-            good = 1;
-            break;
-        }
-    }
-    if (good) {
-        buffer[strlen(buffer) - 1] = '\0';
-    }
-
-    /* return the output */
+	/* add nullchar at the end */
+	for (int i = 0 ; i != sizeof(buffer); i++) {
+		if (buffer[i] == '\0') {
+			good = 1;
+			break;
+		}
+	}
+	if (good) {
+		buffer[strlen(buffer) - 1] = '\0';
+	}
+
+	/* return the output */
 	return smprintf("%s", buffer);
 }
 
@@ -489,67 +487,65 @@ run_command(const char* command)
 char *
 temp(const char *file)
 {
-    int temperature;
-    FILE *fp;
+	int temperature;
+	FILE *fp;
 
-    /* open temperature file */
-    if (!(fp = fopen(file, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        return smprintf("n/a");
-    }
+	/* open temperature file */
+	if (!(fp = fopen(file, "r"))) {
+		fprintf(stderr, "Could not open temperature file.\n");
+		return smprintf("n/a");
+	}
 
-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+	/* extract temperature */
+	fscanf(fp, "%d", &temperature);
 
-    /* close temperature file */
-    fclose(fp);
+	/* close temperature file */
+	fclose(fp);
 
-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+	/* return temperature in degrees */
+	return smprintf("%d°C", temperature / 1000);
 }
 
 /* username */
 char *
 username(const char *null)
 {
-    register struct passwd *pw;
-    register uid_t uid;
-
-    /* get the values */
-    uid = geteuid ();
-    pw = getpwuid (uid);
-
-    /* if it worked, return */
-    if (pw) {
-        return smprintf("%s", pw->pw_name);
-    }
-    else {
-        fprintf(stderr, "Could not get username.\n");
-        return smprintf("n/a");
-    }
-
-    return smprintf("n/a");
+	register struct passwd *pw;
+	register uid_t uid;
+
+	/* get the values */
+	uid = geteuid();
+	pw = getpwuid(uid);
+
+	/* if it worked, return */
+	if (pw) {
+		return smprintf("%s", pw->pw_name);
+	} else {
+		fprintf(stderr, "Could not get username.\n");
+		return smprintf("n/a");
+	}
+
+	return smprintf("n/a");
 }
 
 /* uid */
 char *
 uid(const char *null)
 {
-    register uid_t uid;
+	register uid_t uid;
 
-    /* get the values */
-    uid = geteuid ();
+	/* get the values */
+	uid = geteuid();
 
-    /* if it worked, return */
-    if (uid) {
-        return smprintf("%d", uid);
-    }
-    else {
-        fprintf(stderr, "Could not get uid.\n");
-        return smprintf("n/a");
-    }
+	/* if it worked, return */
+	if (uid) {
+		return smprintf("%d", uid);
+	} else {
+		fprintf(stderr, "Could not get uid.\n");
+		return smprintf("n/a");
+	}
 
-    return smprintf("n/a");
+	return smprintf("n/a");
 }
 
 
@@ -557,193 +553,191 @@ uid(const char *null)
 char *
 vol_perc(const char *soundcard)
 {
-    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;
-
-    /* open everything */
-    snd_mixer_open(&handle, 0);
-    snd_mixer_attach(handle, soundcard);
-    snd_mixer_selem_register(handle, NULL, NULL);
-    snd_mixer_load(handle);
-
-    /* prepare everything */
-    snd_mixer_selem_id_malloc(&vol_info);
-    snd_mixer_selem_id_malloc(&mute_info);
-    /* check */
-    if (vol_info == NULL || mute_info == NULL) {
-        fprintf(stderr, "Could not get alsa volume");
-        return smprintf("n/a");
-    }
-    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);
-
-    /* get the 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);
-
-    /* clean up */
-    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 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;
+
+	/* open everything */
+	snd_mixer_open(&handle, 0);
+	snd_mixer_attach(handle, soundcard);
+	snd_mixer_selem_register(handle, NULL, NULL);
+	snd_mixer_load(handle);
+
+	/* prepare everything */
+	snd_mixer_selem_id_malloc(&vol_info);
+	snd_mixer_selem_id_malloc(&mute_info);
+	/* check */
+	if (vol_info == NULL || mute_info == NULL) {
+		fprintf(stderr, "Could not get alsa volume");
+		return smprintf("n/a");
+	}
+	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);
+
+	/* get the 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);
+
+	/* clean up */
+	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);
+	}
 }
 
 /* wifi percentage */
 char *
 wifi_perc(const char *wificard)
 {
-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path[64];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
-
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, "/sys/class/net/");
-    strcat(path, wificard);
-    strcat(path, "/operstate");
-
-    /* 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);
+	int bufsize = 255;
+	int strength;
+	char buf[bufsize];
+	char *datastart;
+	char path[64];
+	char status[5];
+	char needle[sizeof wificard + 1];
+	FILE *fp;
+
+	/* generate the path name */
+	memset(path, 0, sizeof path);
+	strcat(path, "/sys/class/net/");
+	strcat(path, wificard);
+	strcat(path, "/operstate");
+
+	/* 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);
 }
 
 /* wifi essid */
 char *
 wifi_essid(const char *wificard)
 {
-    char id[IW_ESSID_MAX_SIZE+1];
-    int sockfd;
-    struct iwreq wreq;
-
-    /* prepare */
-    memset(&wreq, 0, sizeof(struct iwreq));
-    wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
-
-    /* set the interface */
-    sprintf(wreq.ifr_name, wificard);
-
-    /* check */
-    if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
-        fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
-        return smprintf("n/a");
-    }
-    wreq.u.essid.pointer = id;
-    if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
-        fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
-        return smprintf("n/a");
-    }
-
-    /* return the essid */
-    if (strcmp((char *)wreq.u.essid.pointer, "") == 0) {
-        return smprintf("n/a");
-    }
-    else {
-        return smprintf("%s", (char *)wreq.u.essid.pointer);
-    }
+	char id[IW_ESSID_MAX_SIZE+1];
+	int sockfd;
+	struct iwreq wreq;
+
+	/* prepare */
+	memset(&wreq, 0, sizeof(struct iwreq));
+	wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
+
+	/* set the interface */
+	sprintf(wreq.ifr_name, wificard);
+
+	/* check */
+	if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+		fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
+		return smprintf("n/a");
+	}
+	wreq.u.essid.pointer = id;
+	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+		fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
+		return smprintf("n/a");
+	}
+
+	/* return the essid */
+	if (strcmp((char *)wreq.u.essid.pointer, "") == 0) {
+		return smprintf("n/a");
+	} else {
+		return smprintf("%s", (char *)wreq.u.essid.pointer);
+	}
 }
 
 /* main function */
 int
 main(void)
 {
-    char status_string[1024];
-    struct arg argument;
-
-    /* try to open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
-
-    /* return status every interval */
-    for (;;) {
-        /* clear the string */
-        memset(status_string, 0, sizeof(status_string));
-
-        /* generate status_string */
-        for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
-            argument = args[i];
-            char *res = argument.func(argument.args);
-            char *element = smprintf(argument.format, res);
-            if (element == NULL) {
-                element = smprintf("n/a");
-                fprintf(stderr, "Failed to format output.");
-            }
-            strcat(status_string, element);
-            free(res);
-            free(element);
-        }
-
-        /* return the statusbar */
-        setstatus(status_string);
-
-        /* 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;
+	char status_string[1024];
+	struct arg argument;
+
+	/* try to open display */
+	if (!(dpy = XOpenDisplay(0x0))) {
+		fprintf(stderr, "Cannot open display!\n");
+		exit(1);
+	}
+
+	/* return status every interval */
+	for (;;) {
+		/* clear the string */
+		memset(status_string, 0, sizeof(status_string));
+
+		/* generate status_string */
+		for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
+			argument = args[i];
+			char *res = argument.func(argument.args);
+			char *element = smprintf(argument.format, res);
+			if (element == NULL) {
+				element = smprintf("n/a");
+				fprintf(stderr, "Failed to format output.");
+			}
+			strcat(status_string, element);
+			free(res);
+			free(element);
+		}
+
+		/* return the statusbar */
+		setstatus(status_string);
+
+		/* 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;
 }

slstatus.h

@@ -6,9 +6,9 @@ static Display *dpy;
 /* statusbar configuration type and struct */
 typedef char *(*op_fun) (const char *);
 struct arg {
-    op_fun func;
-    const char *format;
-    const char *args;
+	op_fun func;
+	const char *format;
+	const char *args;
 };
 
 /* functions */