Split into multiple files

For multiple reasons the program is now split:
- Make future porting to OpenBSD easier
- Assign header includes to individiual functions
- Make future program extensions easier
- Recompile only changed parts

22 files changed, 826 insertions, 740 deletions

diff --git a/battery.c b/battery.c
new file mode 100644
index 0000000..9f692ea
--- /dev/null
+++ b/battery.c
@@ -0,0 +1,55 @@
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+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) : NULL;
+}
+
+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) : NULL;
+}
+
+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 NULL;
+	}
+
+	for (i = 0; i < LEN(map); i++) {
+		if (!strcmp(map[i].state, state)) {
+			break;
+		}
+	}
+	return (i == LEN(map)) ? "?" : map[i].symbol;
+}
diff --git a/cpu.c b/cpu.c
new file mode 100644
index 0000000..0cc1f88
--- /dev/null
+++ b/cpu.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+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) : NULL;
+}
+
+const char *
+cpu_perc(void)
+{
+	int perc;
+	static long double a[7];
+	static int valid;
+	long double b[7];
+
+	memcpy(b, a, sizeof(b));
+	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
+	           &a[3], &a[4], &a[5], &a[6]) != 7) {
+		return NULL;
+	}
+	if (!valid) {
+		valid = 1;
+		return NULL;
+	}
+
+	perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
+	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
+
+	return bprintf("%d", perc);
+}
+
+const char *
+cpu_iowait(void)
+{
+	int perc;
+	static int valid;
+	static long double a[7];
+	long double b[7];
+
+	memcpy(b, a, sizeof(b));
+	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
+	           &a[3], &a[4], &a[5], &a[6]) != 7) {
+		return NULL;
+	}
+	if (!valid) {
+		valid = 1;
+		return NULL;
+	}
+
+	perc = 100 * ((b[4]) - (a[4])) /
+	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
+
+	return bprintf("%d", perc);
+}
diff --git a/datetime.c b/datetime.c
new file mode 100644
index 0000000..0f7dab4
--- /dev/null
+++ b/datetime.c
@@ -0,0 +1,15 @@
+#include <time.h>
+
+#include "util.h"
+
+const char *
+datetime(const char *fmt)
+{
+	time_t t;
+
+	t = time(NULL);
+	if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
+		return NULL;
+
+	return buf;
+}
diff --git a/disk.c b/disk.c
new file mode 100644
index 0000000..9fd26fc
--- /dev/null
+++ b/disk.c
@@ -0,0 +1,60 @@
+#include <err.h>
+#include <stdio.h>
+#include <sys/statvfs.h>
+
+#include "util.h"
+
+const char *
+disk_free(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return NULL;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+}
+
+const char *
+disk_perc(const char *mnt)
+{
+	int perc;
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return NULL;
+	}
+
+	perc = 100 * (1.0f - ((float)fs.f_bfree / (float)fs.f_blocks));
+
+	return bprintf("%d", perc);
+}
+
+const char *
+disk_total(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return NULL;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+}
+
+const char *
+disk_used(const char *mnt)
+{
+	struct statvfs fs;
+
+	if (statvfs(mnt, &fs) < 0) {
+		warn("Failed to get filesystem info");
+		return NULL;
+	}
+
+	return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+}
diff --git a/entropy.c b/entropy.c
new file mode 100644
index 0000000..b0f879a
--- /dev/null
+++ b/entropy.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+#include "util.h"
+
+const char *
+entropy(void)
+{
+	int num;
+
+	return (pscanf("/proc/sys/kernel/random/entropy_avail", "%d", &num) == 1) ?
+	               bprintf("%d", num) : NULL;
+}
diff --git a/hostname.c b/hostname.c
new file mode 100644
index 0000000..23c5a16
--- /dev/null
+++ b/hostname.c
@@ -0,0 +1,15 @@
+#include <err.h>
+#include <unistd.h>
+
+#include "util.h"
+
+const char *
+hostname(void)
+{
+	if (gethostname(buf, sizeof(buf)) == -1) {
+		warn("hostname");
+		return NULL;
+	}
+
+	return buf;
+}
diff --git a/ip.c b/ip.c
new file mode 100644
index 0000000..600fb86
--- /dev/null
+++ b/ip.c
@@ -0,0 +1,69 @@
+#include <err.h>
+#include <ifaddrs.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+const char *
+ipv4(const char *iface)
+{
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
+
+	if (getifaddrs(&ifaddr) == -1) {
+		warn("Failed to get IPv4 address for interface %s", iface);
+		return NULL;
+	}
+
+	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 IPv4 address for interface %s", iface);
+				return NULL;
+			}
+			return bprintf("%s", host);
+		}
+	}
+
+	freeifaddrs(ifaddr);
+
+	return NULL;
+}
+
+const char *
+ipv6(const char *iface)
+{
+	struct ifaddrs *ifaddr, *ifa;
+	int s;
+	char host[NI_MAXHOST];
+
+	if (getifaddrs(&ifaddr) == -1) {
+		warn("Failed to get IPv6 address for interface %s", iface);
+		return NULL;
+	}
+
+	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+		if (ifa->ifa_addr == NULL) {
+			continue;
+		}
+		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+		if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
+			if (s != 0) {
+				warnx("Failed to get IPv6 address for interface %s", iface);
+				return NULL;
+			}
+			return bprintf("%s", host);
+		}
+	}
+
+	freeifaddrs(ifaddr);
+
+	return NULL;
+}
diff --git a/kernel_release.c b/kernel_release.c
new file mode 100644
index 0000000..64f1463
--- /dev/null
+++ b/kernel_release.c
@@ -0,0 +1,16 @@
+#include <sys/utsname.h>
+#include <stdio.h>
+
+#include "util.h"
+
+const char *
+kernel_release(void)
+{
+	struct utsname udata;
+
+	if (uname(&udata) < 0) {
+		return NULL;
+	}
+
+	return bprintf("%s", udata.release);
+}
diff --git a/keyboard_indicators.c b/keyboard_indicators.c
new file mode 100644
index 0000000..4aeae0d
--- /dev/null
+++ b/keyboard_indicators.c
@@ -0,0 +1,29 @@
+#include <err.h>
+#include <X11/Xlib.h>
+
+#include "util.h"
+
+const char *
+keyboard_indicators(void)
+{
+	Display *dpy = XOpenDisplay(NULL);
+	XKeyboardState state;
+
+	if (dpy == NULL) {
+		warnx("XOpenDisplay failed");
+		return NULL;
+	}
+	XGetKeyboardControl(dpy, &state);
+	XCloseDisplay(dpy);
+
+	switch (state.led_mask) {
+		case 1:
+			return "c";
+		case 2:
+			return "n";
+		case 3:
+			return "cn";
+		default:
+			return "";
+	}
+}
diff --git a/load_avg.c b/load_avg.c
new file mode 100644
index 0000000..7342ae9
--- /dev/null
+++ b/load_avg.c
@@ -0,0 +1,17 @@
+#include <err.h>
+#include <stdlib.h>
+
+#include "util.h"
+
+const char *
+load_avg(const char *fmt)
+{
+	double avgs[3];
+
+	if (getloadavg(avgs, 3) < 0) {
+		warnx("Failed to get the load avg");
+		return NULL;
+	}
+
+	return bprintf(fmt, avgs[0], avgs[1], avgs[2]);
+}
diff --git a/num_files.c b/num_files.c
new file mode 100644
index 0000000..505e24a
--- /dev/null
+++ b/num_files.c
@@ -0,0 +1,29 @@
+#include <dirent.h>
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+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 NULL;
+	}
+
+	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);
+}
diff --git a/ram.c b/ram.c
new file mode 100644
index 0000000..8f7c682
--- /dev/null
+++ b/ram.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+
+#include "util.h"
+
+const char *
+ram_free(void)
+{
+	long free;
+
+	return (pscanf("/proc/meminfo", "MemFree: %ld kB\n", &free) == 1) ?
+	       bprintf("%f", (float)free / 1024 / 1024) : NULL;
+}
+
+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) :
+	       NULL;
+}
+
+const char *
+ram_total(void)
+{
+	long total;
+
+	return (pscanf("/proc/meminfo", "MemTotal: %ld kB\n", &total) == 1) ?
+	       bprintf("%f", (float)total / 1024 / 1024) : NULL;
+}
+
+const char *
+ram_used(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("%f", (float)(total - free - buffers - cached) / 1024 / 1024) :
+	       NULL;
+}
diff --git a/run_command.c b/run_command.c
new file mode 100644
index 0000000..26f1f17
--- /dev/null
+++ b/run_command.c
@@ -0,0 +1,26 @@
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+const char *
+run_command(const char *cmd)
+{
+	char *p;
+	FILE *fp;
+
+	fp = popen(cmd, "r");
+	if (fp == NULL) {
+		warn("Failed to get command output for %s", cmd);
+		return NULL;
+	}
+	p = fgets(buf, sizeof(buf) - 1, fp);
+	pclose(fp);
+	if (!p)
+		return NULL;
+	if ((p = strrchr(buf, '\n')) != NULL)
+		p[0] = '\0';
+
+	return buf[0] ? buf : NULL;
+}
diff --git a/slstatus.c b/slstatus.c
index d17bae7..c7e9303 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,34 +1,16 @@
 /* See LICENSE file for copyright and license details. */
-#include <dirent.h>
 #include <err.h>
 #include <errno.h>
-#include <fcntl.h>
-#include <ifaddrs.h>
-#include <limits.h>
-#include <linux/wireless.h>
 #include <locale.h>
-#include <netdb.h>
-#include <pwd.h>
 #include <signal.h>
-#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/statvfs.h>
-#include <sys/socket.h>
-#include <sys/soundcard.h>
-#include <sys/sysinfo.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
 #include <time.h>
-#include <unistd.h>
 #include <X11/Xlib.h>
 
 #include "arg.h"
-
-#define LEN(x) (sizeof (x) / sizeof *(x))
+#include "util.h"
 
 struct arg {
 	const char *(*func)();
@@ -79,727 +61,6 @@ static Display *dpy;
 
 #include "config.h"
 
-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;
-}
-
-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)
-{
-	int perc;
-	static long double a[7];
-	static int valid;
-	long double b[7];
-
-	memcpy(b, a, sizeof(b));
-	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
-	           &a[3], &a[4], &a[5], &a[6]) != 7) {
-		return unknown_str;
-	}
-	if (!valid) {
-		valid = 1;
-		return unknown_str;
-	}
-
-	perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
-	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
-
-	return bprintf("%d", perc);
-}
-
-static const char *
-cpu_iowait(void)
-{
-	int perc;
-	static int valid;
-	static long double a[7];
-	long double b[7];
-
-	memcpy(b, a, sizeof(b));
-	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
-	           &a[3], &a[4], &a[5], &a[6]) != 7) {
-		return unknown_str;
-	}
-	if (!valid) {
-		valid = 1;
-		return unknown_str;
-	}
-
-	perc = 100 * ((b[4]) - (a[4])) /
-	       ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
-
-	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 *
-ipv4(const char *iface)
-{
-	struct ifaddrs *ifaddr, *ifa;
-	int s;
-	char host[NI_MAXHOST];
-
-	if (getifaddrs(&ifaddr) == -1) {
-		warn("Failed to get IPv4 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 IPv4 address for interface %s", iface);
-				return unknown_str;
-			}
-			return bprintf("%s", host);
-		}
-	}
-
-	freeifaddrs(ifaddr);
-
-	return unknown_str;
-}
-
-static const char *
-ipv6(const char *iface)
-{
-	struct ifaddrs *ifaddr, *ifa;
-	int s;
-	char host[NI_MAXHOST];
-
-	if (getifaddrs(&ifaddr) == -1) {
-		warn("Failed to get IPv6 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_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
-		if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
-			if (s != 0) {
-				warnx("Failed to get IPv6 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(const char *fmt)
-{
-	double avgs[3];
-
-	if (getloadavg(avgs, 3) < 0) {
-		warnx("Failed to get the load avg");
-		return unknown_str;
-	}
-
-	return bprintf(fmt, 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;
-
-	return (pscanf("/proc/meminfo", "MemTotal: %ld kB\n", &total) == 1) ?
-	       bprintf("%f", (float)total / 1024 / 1024) : unknown_str;
-}
-
-static const char *
-ram_used(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("%f", (float)(total - free - buffers - cached) / 1024 / 1024) :
-	       unknown_str;
-}
-
-static const char *
-run_command(const char *cmd)
-{
-	char *p;
-	FILE *fp;
-
-	fp = popen(cmd, "r");
-	if (fp == NULL) {
-		warn("Failed to get command output for %s", cmd);
-		return unknown_str;
-	}
-	p = fgets(buf, sizeof(buf) - 1, fp);
-	pclose(fp);
-	if (!p)
-		return unknown_str;
-	if ((p = strrchr(buf, '\n')) != NULL)
-		p[0] = '\0';
-
-	return buf[0] ? buf : unknown_str;
-}
-
-static const char *
-swap_free(void)
-{
-	long total, free;
-	FILE *fp;
-	size_t bytes_read;
-	char *match;
-
-	fp = fopen("/proc/meminfo", "r");
-	if (fp == NULL) {
-		warn("Failed to open file /proc/meminfo");
-		return unknown_str;
-	}
-
-	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
-		warn("swap_free: read error");
-		fclose(fp);
-		return unknown_str;
-	}
-	fclose(fp);
-
-	if ((match = strstr(buf, "SwapTotal")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-
-	if ((match = strstr(buf, "SwapFree")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapFree: %ld kB\n", &free);
-
-	return bprintf("%f", (float)free / 1024 / 1024);
-}
-
-static const char *
-swap_perc(void)
-{
-	long total, free, cached;
-	FILE *fp;
-	size_t bytes_read;
-	char *match;
-
-	fp = fopen("/proc/meminfo", "r");
-	if (fp == NULL) {
-		warn("Failed to open file /proc/meminfo");
-		return unknown_str;
-	}
-
-	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
-		warn("swap_perc: read error");
-		fclose(fp);
-		return unknown_str;
-	}
-	fclose(fp);
-
-	if ((match = strstr(buf, "SwapTotal")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-
-	if ((match = strstr(buf, "SwapCached")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapCached: %ld kB\n", &cached);
-
-	if ((match = strstr(buf, "SwapFree")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapFree: %ld kB\n", &free);
-
-	return bprintf("%d", 100 * (total - free - cached) / total);
-}
-
-static const char *
-swap_total(void)
-{
-	long total;
-	FILE *fp;
-	size_t bytes_read;
-	char *match;
-
-	fp = fopen("/proc/meminfo", "r");
-	if (fp == NULL) {
-		warn("Failed to open file /proc/meminfo");
-		return unknown_str;
-	}
-	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
-		warn("swap_total: read error");
-		fclose(fp);
-		return unknown_str;
-	}
-	fclose(fp);
-
-	if ((match = strstr(buf, "SwapTotal")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-
-	return bprintf("%f", (float)total / 1024 / 1024);
-}
-
-static const char *
-swap_used(void)
-{
-	long total, free, cached;
-	FILE *fp;
-	size_t bytes_read;
-	char *match;
-
-	fp = fopen("/proc/meminfo", "r");
-	if (fp == NULL) {
-		warn("Failed to open file /proc/meminfo");
-		return unknown_str;
-	}
-	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
-		warn("swap_used: read error");
-		fclose(fp);
-		return unknown_str;
-	}
-	fclose(fp);
-
-	if ((match = strstr(buf, "SwapTotal")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-
-	if ((match = strstr(buf, "SwapCached")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapCached: %ld kB\n", &cached);
-
-	if ((match = strstr(buf, "SwapFree")) == NULL)
-		return unknown_str;
-	sscanf(match, "SwapFree: %ld kB\n", &free);
-
-	return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
-}
-
-static const char *
-temp(const char *file)
-{
-	int temp;
-
-	return (pscanf(file, "%d", &temp) == 1) ?
-	       bprintf("%d", temp / 1000) : unknown_str;
-}
-
-static const char *
-uptime(void)
-{
-	struct sysinfo info;
-	int h = 0;
-	int m = 0;
-
-	sysinfo(&info);
-	h = info.uptime / 3600;
-	m = (info.uptime - h * 3600 ) / 60;
-
-	return bprintf("%dh %dm", h, m);
-}
-
-static const char *
-username(void)
-{
-	struct passwd *pw = getpwuid(geteuid());
-
-	if (pw == NULL) {
-		warn("Failed to get username");
-		return unknown_str;
-	}
-
-	return bprintf("%s", pw->pw_name);
-}
-
-static const char *
-uid(void)
-{
-	return bprintf("%d", geteuid());
-}
-
-
-static const char *
-vol_perc(const char *card)
-{
-	unsigned int i;
-	int v, afd, devmask;
-	char *vnames[] = SOUND_DEVICE_NAMES;
-
-	afd = open(card, O_RDONLY | O_NONBLOCK);
-	if (afd == -1) {
-		warn("Cannot open %s", card);
-		return unknown_str;
-	}
-
-	if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
-		warn("Cannot get volume for %s", card);
-		close(afd);
-		return unknown_str;
-	}
-	for (i = 0; i < LEN(vnames); i++) {
-		if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
-			if (ioctl(afd, MIXER_READ(i), &v) == -1) {
-				warn("vol_perc: ioctl");
-				close(afd);
-				return unknown_str;
-			}
-		}
-	}
-
-	close(afd);
-
-	return bprintf("%d", v & 0xff);
-}
-
-static const char *
-wifi_perc(const char *iface)
-{
-	int i, perc;
-	char *p, *datastart;
-	char path[PATH_MAX];
-	char status[5];
-	FILE *fp;
-
-	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
-	fp = fopen(path, "r");
-	if (fp == NULL) {
-		warn("Failed to open file %s", path);
-		return unknown_str;
-	}
-	p = fgets(status, 5, fp);
-	fclose(fp);
-	if(!p || strcmp(status, "up\n") != 0) {
-		return unknown_str;
-	}
-
-	fp = fopen("/proc/net/wireless", "r");
-	if (fp == NULL) {
-		warn("Failed to open file /proc/net/wireless");
-		return unknown_str;
-	}
-
-	for (i = 0; i < 3; i++) {
-		if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
-			break;
-	}
-	fclose(fp);
-	if (i < 2 || !p)
-		return unknown_str;
-
-	if ((datastart = strstr(buf, iface)) == NULL)
-		return unknown_str;
-
-	datastart = (datastart+(strlen(iface)+1));
-	sscanf(datastart + 1, " %*d   %d  %*d  %*d		  %*d	   %*d		%*d		 %*d	  %*d		 %*d", &perc);
-
-	return bprintf("%d", perc);
-}
-
-static const char *
-wifi_essid(const char *iface)
-{
-	static 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;
-	snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
-
-	if (sockfd == -1) {
-		warn("Failed to get ESSID for interface %s", iface);
-		return unknown_str;
-	}
-	wreq.u.essid.pointer = id;
-	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
-		warn("Failed to get ESSID for interface %s", iface);
-		return unknown_str;
-	}
-
-	close(sockfd);
-
-	if (strcmp(id, "") == 0)
-		return unknown_str;
-	else
-		return id;
-}
-
 static void
 terminate(const int signo)
 {
diff --git a/swap.c b/swap.c
new file mode 100644
index 0000000..2a627c3
--- /dev/null
+++ b/swap.c
@@ -0,0 +1,135 @@
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+const char *
+swap_free(void)
+{
+	long total, free;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return NULL;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_free: read error");
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)free / 1024 / 1024);
+}
+
+const char *
+swap_perc(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return NULL;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_perc: read error");
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return NULL;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%d", 100 * (total - free - cached) / total);
+}
+
+const char *
+swap_total(void)
+{
+	long total;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return NULL;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_total: read error");
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	return bprintf("%f", (float)total / 1024 / 1024);
+}
+
+const char *
+swap_used(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/meminfo");
+		return NULL;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		warn("swap_used: read error");
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return NULL;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
+}
diff --git a/temperature.c b/temperature.c
new file mode 100644
index 0000000..91b871b
--- /dev/null
+++ b/temperature.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+#include "util.h"
+
+const char *
+temp(const char *file)
+{
+	int temp;
+
+	return (pscanf(file, "%d", &temp) == 1) ?
+	       bprintf("%d", temp / 1000) : NULL;
+}
diff --git a/uptime.c b/uptime.c
new file mode 100644
index 0000000..c9f4fda
--- /dev/null
+++ b/uptime.c
@@ -0,0 +1,17 @@
+#include <sys/sysinfo.h>
+
+#include "util.h"
+
+const char *
+uptime(void)
+{
+	struct sysinfo info;
+	int h = 0;
+	int m = 0;
+
+	sysinfo(&info);
+	h = info.uptime / 3600;
+	m = (info.uptime - h * 3600 ) / 60;
+
+	return bprintf("%dh %dm", h, m);
+}
diff --git a/user.c b/user.c
new file mode 100644
index 0000000..5ab7c8e
--- /dev/null
+++ b/user.c
@@ -0,0 +1,31 @@
+#include <err.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "util.h"
+
+const char *
+gid(void)
+{
+	return bprintf("%d", getgid());
+}
+
+const char *
+username(void)
+{
+	struct passwd *pw = getpwuid(geteuid());
+
+	if (pw == NULL) {
+		warn("Failed to get username");
+		return NULL;
+	}
+
+	return bprintf("%s", pw->pw_name);
+}
+
+const char *
+uid(void)
+{
+	return bprintf("%d", geteuid());
+}
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..98c5fc5
--- /dev/null
+++ b/util.c
@@ -0,0 +1,42 @@
+#include <err.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+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;
+}
+
+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;
+}
diff --git a/util.h b/util.h
new file mode 100644
index 0000000..6f47e85
--- /dev/null
+++ b/util.h
@@ -0,0 +1,6 @@
+static char buf[1024];
+
+#define LEN(x) (sizeof (x) / sizeof *(x))
+
+const char *bprintf(const char *fmt, ...);
+int pscanf(const char *path, const char *fmt, ...);
diff --git a/volume.c b/volume.c
new file mode 100644
index 0000000..a23c4f1
--- /dev/null
+++ b/volume.c
@@ -0,0 +1,42 @@
+#include <err.h>
+#include <fcntl.h>
+#include <sys/soundcard.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util.h"
+
+const char *
+vol_perc(const char *card)
+{
+	unsigned int i;
+	int v, afd, devmask;
+	char *vnames[] = SOUND_DEVICE_NAMES;
+
+	afd = open(card, O_RDONLY | O_NONBLOCK);
+	if (afd == -1) {
+		warn("Cannot open %s", card);
+		return NULL;
+	}
+
+	if (ioctl(afd, SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
+		warn("Cannot get volume for %s", card);
+		close(afd);
+		return NULL;
+	}
+	for (i = 0; i < LEN(vnames); i++) {
+		if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
+			if (ioctl(afd, MIXER_READ(i), &v) == -1) {
+				warn("vol_perc: ioctl");
+				close(afd);
+				return NULL;
+			}
+		}
+	}
+
+	close(afd);
+
+	return bprintf("%d", v & 0xff);
+}
diff --git a/wifi.c b/wifi.c
new file mode 100644
index 0000000..b0c81f9
--- /dev/null
+++ b/wifi.c
@@ -0,0 +1,84 @@
+#include <err.h>
+#include <ifaddrs.h>
+#include <linux/wireless.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <limits.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "util.h"
+
+const char *
+wifi_perc(const char *iface)
+{
+	int i, perc;
+	char *p, *datastart;
+	char path[PATH_MAX];
+	char status[5];
+	FILE *fp;
+
+	snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		warn("Failed to open file %s", path);
+		return NULL;
+	}
+	p = fgets(status, 5, fp);
+	fclose(fp);
+	if(!p || strcmp(status, "up\n") != 0) {
+		return NULL;
+	}
+
+	fp = fopen("/proc/net/wireless", "r");
+	if (fp == NULL) {
+		warn("Failed to open file /proc/net/wireless");
+		return NULL;
+	}
+
+	for (i = 0; i < 3; i++) {
+		if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
+			break;
+	}
+	fclose(fp);
+	if (i < 2 || !p)
+		return NULL;
+
+	if ((datastart = strstr(buf, iface)) == NULL)
+		return NULL;
+
+	datastart = (datastart+(strlen(iface)+1));
+	sscanf(datastart + 1, " %*d   %d  %*d  %*d		  %*d	   %*d		%*d		 %*d	  %*d		 %*d", &perc);
+
+	return bprintf("%d", perc);
+}
+
+const char *
+wifi_essid(const char *iface)
+{
+	static 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;
+	snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
+
+	if (sockfd == -1) {
+		warn("Failed to get ESSID for interface %s", iface);
+		return NULL;
+	}
+	wreq.u.essid.pointer = id;
+	if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+		warn("Failed to get ESSID for interface %s", iface);
+		return NULL;
+	}
+
+	close(sockfd);
+
+	if (strcmp(id, "") == 0)
+		return NULL;
+	else
+		return id;
+}