Merge remote-tracking branch 'suckless/master'

LICENSE

@@ -1,6 +1,6 @@
 ISC License
 
-Copyright 2016-2020 Aaron Marcher <me@drkhsh.at>
+Copyright 2016-2022 Aaron Marcher <me@drkhsh.at>
 
 Copyright 2016 Roy Freytag <rfreytag@hs-mittweida.de>
 Copyright 2016 Vincent Loupmon <vincentloupmon@gmail.com>
@@ -9,23 +9,26 @@ Copyright 2016-2018 Ali H. Fardan <raiz@firemail.cc>
 Copyright 2016 Jody Leonard <me@jodyleonard.com>
 Copyright 2016-2018 Quentin Rameau <quinq@fifth.space>
 Copyright 2016 Mike Coddington <mike@coddington.us>
-Copyright 2016-2018 parazyd <parazyd@dyne.org>
+Copyright 2016-2018 Ivan J. <parazyd@dyne.org>
 Copyright 2017 Tobias Stoeckmann <tobias@stoeckmann.org>
 Copyright 2017-2018 Laslo Hunhold <dev@frign.de>
 Copyright 2018 Darron Anderson <darronanderson@protonmail.com>
 Copyright 2018 Josuah Demangeon <mail@josuah.net>
 Copyright 2018 Tobias Tschinkowitz <tobias@he4d.net>
 Copyright 2018 David Demelier <markand@malikania.fr>
-Copyright 2018-2019 Michael Buch <michaelbuch12@gmail.com>
+Copyright 2018-2012 Michael Buch <michaelbuch12@gmail.com>
 Copyright 2018 Ian Remmler <ian@remmler.org>
 Copyright 2016-2019 Joerg Jung <jung@openbsd.org>
 Copyright 2019 Ryan Kes <alrayyes@gmail.com>
 Copyright 2019 Cem Keylan <cem@ckyln.com>
-Copyright 2019 dsp <dsp@2f30.org>
+Copyright 2019 Dimitris Papastamos <dsp@2f30.org>
-Copyright 2019-2020 Ingo Feinerer <feinerer@logic.at>
+Copyright 2019-2022 Ingo Feinerer <feinerer@logic.at>
 Copyright 2020 Alexandre Ratchov <alex@caoua.org>
 Copyright 2020 Mart Lubbers <mart@martlubbers.net>
 Copyright 2020 Daniel Moch <daniel@danielmoch.com>
+Copyright 2022 Nickolas Raymond Kaczynski <nrk@disroot.org>
+Copyright 2022 Patrick Iacob <iacobp@oregonstate.edu>
+Copyright 2021-2022 Steven Ward <planet36@gmail.com>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted, provided that the above

Makefile

@@ -7,6 +7,7 @@ include config.mk
 REQ = util
 COM =\
 	components/battery\
+	components/cat\
 	components/cpu\
 	components/datetime\
 	components/disk\
@@ -21,7 +22,6 @@ COM =\
 	components/num_files\
 	components/ram\
 	components/run_command\
-	components/separator\
 	components/swap\
 	components/temperature\
 	components/uptime\
@@ -31,7 +31,7 @@ COM =\
 
 all: slstatus
 
-$(COM:=.o): config.mk $(REQ:=.h)
+$(COM:=.o): config.mk $(REQ:=.h) slstatus.h
 slstatus.o: slstatus.c slstatus.h arg.h config.h config.mk $(REQ:=.h)
 
 .c.o:
@@ -44,14 +44,15 @@ slstatus: slstatus.o $(COM:=.o) $(REQ:=.o)
 	$(CC) -o $@ $(LDFLAGS) $(COM:=.o) $(REQ:=.o) slstatus.o $(LDLIBS)
 
 clean:
-	rm -f slstatus slstatus.o $(COM:=.o) $(REQ:=.o)
+	rm -f slstatus slstatus.o $(COM:=.o) $(REQ:=.o) slstatus-${VERSION}.tar.gz
 
 dist:
 	rm -rf "slstatus-$(VERSION)"
 	mkdir -p "slstatus-$(VERSION)/components"
 	cp -R LICENSE Makefile README config.mk config.def.h \
-	      arg.h slstatus.c $(COM:=.c) $(REQ:=.c) $(REQ:=.h) \
+	      arg.h slstatus.h slstatus.c $(REQ:=.c) $(REQ:=.h) \
 	      slstatus.1 "slstatus-$(VERSION)"
+	cp -R $(COM:=.c) "slstatus-$(VERSION)/components"
 	tar -cf - "slstatus-$(VERSION)" | gzip -c > "slstatus-$(VERSION).tar.gz"
 	rm -rf "slstatus-$(VERSION)"
 

README

@@ -1,12 +1,15 @@
 slstatus - suckless status
 ==========================
-slstatus is a suckless status monitor for window managers that use WM_NAME
+slstatus is a small tool for providing system status information to other
-(e.g. dwm) or stdin to fill the status bar.
+programs over the EWMH property of the root window (used by dwm(1)) or
+standard input/output. It is designed to be as efficient as possible by
+only issuing the minimum of system calls required.
 
 
 Features
 --------
 - Battery percentage/state/time left
+- Cat (read file)
 - CPU usage
 - CPU frequency
 - Custom shell commands
@@ -35,6 +38,10 @@ Requirements
 Currently slstatus works on FreeBSD, Linux and OpenBSD.
 In order to build slstatus you need the Xlib header files.
 
+- For volume percentage on Linux the kernel module `snd-mixer-oss` must be
+  loaded.
+- For volume percentage on FreeBSD, `sndio` must be installed.
+
 
 Installation
 ------------
@@ -56,10 +63,3 @@ Configuration
 -------------
 slstatus can be customized by creating a custom config.h and (re)compiling the
 source code. This keeps it fast, secure and simple.
-
-
-Upcoming
---------
-
-A release (v1.0) will come soon... ;)
-After a long phase of inactivity, development has been continued!

components/battery.c

@@ -2,26 +2,35 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(__linux__)
+/*
+ * https://www.kernel.org/doc/html/latest/power/power_supply_class.html
+ */
 	#include <limits.h>
 	#include <stdint.h>
 	#include <unistd.h>
 
+	#define POWER_SUPPLY_CAPACITY "/sys/class/power_supply/%s/capacity"
+	#define POWER_SUPPLY_STATUS   "/sys/class/power_supply/%s/status"
+	#define POWER_SUPPLY_CHARGE   "/sys/class/power_supply/%s/charge_now"
+	#define POWER_SUPPLY_ENERGY   "/sys/class/power_supply/%s/energy_now"
+	#define POWER_SUPPLY_CURRENT  "/sys/class/power_supply/%s/current_now"
+	#define POWER_SUPPLY_POWER    "/sys/class/power_supply/%s/power_now"
+
 	static const char *
 	pick(const char *bat, const char *f1, const char *f2, char *path,
 	     size_t length)
 	{
 		if (esnprintf(path, length, f1, bat) > 0 &&
-		    access(path, R_OK) == 0) {
+		    access(path, R_OK) == 0)
 			return f1;
-		}
 
 		if (esnprintf(path, length, f2, bat) > 0 &&
-		    access(path, R_OK) == 0) {
+		    access(path, R_OK) == 0)
 			return f2;
-		}
 
 		return NULL;
 	}
@@ -29,18 +38,15 @@
 	const char *
 	battery_perc(const char *bat)
 	{
-		int perc;
+		int cap_perc;
 		char path[PATH_MAX];
 
-		if (esnprintf(path, sizeof(path),
+		if (esnprintf(path, sizeof(path), POWER_SUPPLY_CAPACITY, bat) < 0)
-		              "/sys/class/power_supply/%s/capacity", bat) < 0) {
 			return NULL;
-		}
+		if (pscanf(path, "%d", &cap_perc) != 1)
-		if (pscanf(path, "%d", &perc) != 1) {
 			return NULL;
-		}
 
-		return bprintf("%d", perc);
+		return bprintf("%d", cap_perc);
 	}
 
 	const char *
@@ -53,23 +59,20 @@
 			{ "Charging",    "+" },
 			{ "Discharging", "-" },
 			{ "Full",        "o" },
+			{ "Not charging", "o" },
 		};
 		size_t i;
 		char path[PATH_MAX], state[12];
 
-		if (esnprintf(path, sizeof(path),
+		if (esnprintf(path, sizeof(path), POWER_SUPPLY_STATUS, bat) < 0)
-		              "/sys/class/power_supply/%s/status", bat) < 0) {
 			return NULL;
-		}
+		if (pscanf(path, "%12[a-zA-Z ]", state) != 1)
-		if (pscanf(path, "%12s", state) != 1) {
 			return NULL;
-		}
 
-		for (i = 0; i < LEN(map); i++) {
+		for (i = 0; i < LEN(map); i++)
-			if (!strcmp(map[i].state, state)) {
+			if (!strcmp(map[i].state, state))
 				break;
-			}
+
-		}
 		return (i == LEN(map)) ? "?" : map[i].symbol;
 	}
 
@@ -80,32 +83,24 @@
 		double timeleft;
 		char path[PATH_MAX], state[12];
 
-		if (esnprintf(path, sizeof(path),
+		if (esnprintf(path, sizeof(path), POWER_SUPPLY_STATUS, bat) < 0)
-		              "/sys/class/power_supply/%s/status", bat) < 0) {
 			return NULL;
-		}
+		if (pscanf(path, "%12[a-zA-Z ]", state) != 1)
-		if (pscanf(path, "%12s", state) != 1) {
 			return NULL;
-		}
 
-		if (!pick(bat, "/sys/class/power_supply/%s/charge_now",
+		if (!pick(bat, POWER_SUPPLY_CHARGE, POWER_SUPPLY_ENERGY, path,
-		          "/sys/class/power_supply/%s/energy_now", path,
 		          sizeof(path)) ||
-		    pscanf(path, "%ju", &charge_now) < 0) {
+		    pscanf(path, "%ju", &charge_now) < 0)
 			return NULL;
-		}
 
 		if (!strcmp(state, "Discharging")) {
-			if (!pick(bat, "/sys/class/power_supply/%s/current_now",
+			if (!pick(bat, POWER_SUPPLY_CURRENT, POWER_SUPPLY_POWER, path,
-			          "/sys/class/power_supply/%s/power_now", path,
 			          sizeof(path)) ||
-			    pscanf(path, "%ju", &current_now) < 0) {
+			    pscanf(path, "%ju", &current_now) < 0)
 				return NULL;
-			}
 
-			if (current_now == 0) {
+			if (current_now == 0)
 				return NULL;
-			}
 
 			timeleft = (double)charge_now / (double)current_now;
 			h = timeleft;
@@ -147,9 +142,8 @@
 	{
 		struct apm_power_info apm_info;
 
-		if (load_apm_power_info(&apm_info)) {
+		if (load_apm_power_info(&apm_info))
 			return bprintf("%d", apm_info.battery_life);
-		}
 
 		return NULL;
 	}
@@ -168,11 +162,10 @@
 		size_t i;
 
 		if (load_apm_power_info(&apm_info)) {
-			for (i = 0; i < LEN(map); i++) {
+			for (i = 0; i < LEN(map); i++)
-				if (map[i].state == apm_info.ac_state) {
+				if (map[i].state == apm_info.ac_state)
 					break;
-				}
+
-			}
 			return (i == LEN(map)) ? "?" : map[i].symbol;
 		}
 
@@ -183,12 +176,13 @@
 	battery_remaining(const char *unused)
 	{
 		struct apm_power_info apm_info;
+		unsigned int h, m;
 
 		if (load_apm_power_info(&apm_info)) {
 			if (apm_info.ac_state != APM_AC_ON) {
-				return bprintf("%uh %02um",
+				h = apm_info.minutes_left / 60;
-			                       apm_info.minutes_left / 60,
+				m = apm_info.minutes_left % 60;
-				               apm_info.minutes_left % 60);
+				return bprintf("%uh %02um", h, m);
 			} else {
 				return "";
 			}
@@ -199,18 +193,21 @@
 #elif defined(__FreeBSD__)
 	#include <sys/sysctl.h>
 
+	#define BATTERY_LIFE  "hw.acpi.battery.life"
+	#define BATTERY_STATE "hw.acpi.battery.state"
+	#define BATTERY_TIME  "hw.acpi.battery.time"
+
 	const char *
 	battery_perc(const char *unused)
 	{
-		int cap;
+		int cap_perc;
 		size_t len;
 
-		len = sizeof(cap);
+		len = sizeof(cap_perc);
-		if (sysctlbyname("hw.acpi.battery.life", &cap, &len, NULL, 0) == -1
+		if (sysctlbyname(BATTERY_LIFE, &cap_perc, &len, NULL, 0) < 0 || !len)
-				|| !len)
 			return NULL;
 
-		return bprintf("%d", cap);
+		return bprintf("%d", cap_perc);
 	}
 
 	const char *
@@ -220,12 +217,11 @@
 		size_t len;
 
 		len = sizeof(state);
-		if (sysctlbyname("hw.acpi.battery.state", &state, &len, NULL, 0) == -1
+		if (sysctlbyname(BATTERY_STATE, &state, &len, NULL, 0) < 0 || !len)
-				|| !len)
 			return NULL;
 
 		switch (state) {
-			case 0:
+		case 0: /* FALLTHROUGH */
 		case 2:
 			return "+";
 		case 1:
@@ -242,9 +238,8 @@
 		size_t len;
 
 		len = sizeof(rem);
-		if (sysctlbyname("hw.acpi.battery.time", &rem, &len, NULL, 0) == -1
+		if (sysctlbyname(BATTERY_TIME, &rem, &len, NULL, 0) < 0 || !len
-				|| !len
+		    || rem < 0)
-				|| rem == -1)
 			return NULL;
 
 		return bprintf("%uh %02um", rem / 60, rem % 60);

components/cat.c

@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <string.h>
+
+#include "../slstatus.h"
+#include "../util.h"
+
+const char *
+cat(const char *path)
+{
+        char *f;
+        FILE *fp;
+
+        if (!(fp = fopen(path, "r"))) {
+                warn("fopen '%s':", path);
+                return NULL;
+        }
+
+        f = fgets(buf, sizeof(buf) - 1, fp);
+        if (fclose(fp) < 0) {
+                warn("fclose '%s':", path);
+                return NULL;
+        }
+        if (!f)
+                return NULL;
+
+        if ((f = strrchr(buf, '\n')))
+                f[0] = '\0';
+
+        return buf[0] ? buf : NULL;
+}
+

components/cpu.c

@@ -3,25 +3,26 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(__linux__)
+	#define CPU_FREQ "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
+
 	const char *
-	cpu_freq(void)
+	cpu_freq(const char *unused)
 	{
 		uintmax_t freq;
 
 		/* in kHz */
-		if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/"
+		if (pscanf(CPU_FREQ, "%ju", &freq) != 1)
-		           "scaling_cur_freq", "%ju", &freq) != 1) {
 			return NULL;
-		}
 
 		return fmt_human(freq * 1000, 1000);
 	}
 
 	const char *
-	cpu_perc(void)
+	cpu_perc(const char *unused)
 	{
 		static long double a[7];
 		long double b[7], sum;
@@ -30,19 +31,17 @@
 		/* cpu user nice system idle iowait irq softirq */
 		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) {
+		    != 7)
 			return NULL;
-		}
+
-		if (b[0] == 0) {
+		if (b[0] == 0)
 			return NULL;
-		}
 
 		sum = (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]);
 
-		if (sum == 0) {
+		if (sum == 0)
 			return NULL;
-		}
 
 		return bprintf("%d", (int)(100 *
 		               ((b[0] + b[1] + b[2] + b[5] + b[6]) -
@@ -54,7 +53,7 @@
 	#include <sys/sysctl.h>
 
 	const char *
-	cpu_freq(void)
+	cpu_freq(const char *unused)
 	{
 		int freq, mib[2];
 		size_t size;
@@ -74,7 +73,7 @@
 	}
 
 	const char *
-	cpu_perc(void)
+	cpu_perc(const char *unused)
 	{
 		int mib[2];
 		static uintmax_t a[CPUSTATES];
@@ -91,16 +90,14 @@
 			warn("sysctl 'KERN_CPTIME':");
 			return NULL;
 		}
-		if (b[0] == 0) {
+		if (b[0] == 0)
 			return NULL;
-		}
 
 		sum = (a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
 		      (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]);
 
-		if (sum == 0) {
+		if (sum == 0)
 			return NULL;
-		}
 
 		return bprintf("%d", 100 *
 		               ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
@@ -109,20 +106,19 @@
 		                 b[CP_INTR])) / sum);
 	}
 #elif defined(__FreeBSD__)
+	#include <devstat.h>
 	#include <sys/param.h>
 	#include <sys/sysctl.h>
-	#include <devstat.h>
 
 	const char *
-	cpu_freq(void)
+	cpu_freq(const char *unused)
 	{
 		int freq;
 		size_t size;
 
 		size = sizeof(freq);
 		/* in MHz */
-		if (sysctlbyname("hw.clockrate", &freq, &size, NULL, 0) == -1
+		if (sysctlbyname("hw.clockrate", &freq, &size, NULL, 0) < 0 || !size) {
-				|| !size) {
 			warn("sysctlbyname 'hw.clockrate':");
 			return NULL;
 		}
@@ -131,7 +127,7 @@
 	}
 
 	const char *
-	cpu_perc(void)
+	cpu_perc(const char *unused)
 	{
 		size_t size;
 		static long a[CPUSTATES];
@@ -139,21 +135,18 @@
 
 		size = sizeof(a);
 		memcpy(b, a, sizeof(b));
-		if (sysctlbyname("kern.cp_time", &a, &size, NULL, 0) == -1
+		if (sysctlbyname("kern.cp_time", &a, &size, NULL, 0) < 0 || !size) {
-				|| !size) {
 			warn("sysctlbyname 'kern.cp_time':");
 			return NULL;
 		}
-		if (b[0] == 0) {
+		if (b[0] == 0)
 			return NULL;
-		}
 
 		sum = (a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
 		      (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]);
 
-		if (sum == 0) {
+		if (sum == 0)
 			return NULL;
-		}
 
 		return bprintf("%d", 100 *
 		               ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +

components/datetime.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <time.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *

components/disk.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <sys/statvfs.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
@@ -28,7 +29,7 @@ disk_perc(const char *path)
 	}
 
 	return bprintf("%d", (int)(100 *
-	               (1.0f - ((float)fs.f_bavail / (float)fs.f_blocks))));
+	               (1 - ((double)fs.f_bavail / (double)fs.f_blocks))));
 }
 
 const char *

components/entropy.c

@@ -1,27 +1,29 @@
 /* See LICENSE file for copyright and license details. */
+#include "../slstatus.h"
 #if defined(__linux__)
 	#include <stdint.h>
 	#include <stdio.h>
 
 	#include "../util.h"
 
+	#define ENTROPY_AVAIL "/proc/sys/kernel/random/entropy_avail"
+
 	const char *
-	entropy(void)
+	entropy(const char *unused)
 	{
 		uintmax_t num;
 
-		if (pscanf("/proc/sys/kernel/random/entropy_avail", "%ju", &num)
+		if (pscanf(ENTROPY_AVAIL, "%ju", &num) != 1)
-		    != 1) {
 			return NULL;
-		}
 
 		return bprintf("%ju", num);
 	}
 #elif defined(__OpenBSD__) | defined(__FreeBSD__)
 	const char *
-	entropy(void)
+	entropy(const char *unused)
 	{
+		// https://www.unicode.org/charts/PDF/U2200.pdf
 		/* Unicode Character 'INFINITY' (U+221E) */
-		return "\xe2\x88\x9e";
+		return "\u221E";
 	}
 #endif

components/hostname.c

@@ -2,10 +2,11 @@
 #include <stdio.h>
 #include <unistd.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
-hostname(void)
+hostname(const char *unused)
 {
 	if (gethostname(buf, sizeof(buf)) < 0) {
 		warn("gethostbyname:");

components/ip.c

@@ -4,13 +4,14 @@
 #include <stdio.h>
 #include <string.h>
 #if defined(__OpenBSD__)
-	#include <sys/types.h>
 	#include <sys/socket.h>
+	#include <sys/types.h>
 #elif defined(__FreeBSD__)
 	#include <netinet/in.h>
 	#include <sys/socket.h>
 #endif
 
+#include "../slstatus.h"
 #include "../util.h"
 
 static const char *
@@ -26,9 +27,9 @@ ip(const char *interface, unsigned short sa_family)
 	}
 
 	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-		if (!ifa->ifa_addr) {
+		if (!ifa->ifa_addr)
 			continue;
-		}
+
 		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6),
 		                host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 		if (!strcmp(ifa->ifa_name, interface) &&

components/kernel_release.c

@@ -1,11 +1,12 @@
 /* See LICENSE file for copyright and license details. */
-#include <sys/utsname.h>
 #include <stdio.h>
+#include <sys/utsname.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
-kernel_release(void)
+kernel_release(const char *unused)
 {
 	struct utsname udata;
 

components/keyboard_indicators.c

@@ -4,6 +4,7 @@
 #include <string.h>
 #include <X11/Xlib.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 /*
@@ -32,17 +33,18 @@ keyboard_indicators(const char *fmt)
 	fmtlen = strnlen(fmt, 4);
 	for (i = n = 0; i < fmtlen; i++) {
 		key = tolower(fmt[i]);
-		if (key != 'c' && key != 'n') {
+		if (key != 'c' && key != 'n')
 			continue;
-		}
+
 		togglecase = (i + 1 >= fmtlen || fmt[i + 1] != '?');
 		isset = (state.led_mask & (1 << (key == 'n')));
-		if (togglecase) {
+
+		if (togglecase)
 			buf[n++] = isset ? toupper(key) : key;
-		} else if (isset) {
+		else if (isset)
 			buf[n++] = fmt[i];
 	}
-	}
+
 	buf[n] = 0;
 	return buf;
 }

components/keymap.c

@@ -5,6 +5,7 @@
 #include <X11/XKBlib.h>
 #include <X11/Xlib.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 static int
@@ -14,11 +15,9 @@ valid_layout_or_variant(char *sym)
 	/* invalid symbols from xkb rules config */
 	static const char *invalid[] = { "evdev", "inet", "pc", "base" };
 
-	for (i = 0; i < LEN(invalid); i++) {
+	for (i = 0; i < LEN(invalid); i++)
-		if (!strncmp(sym, invalid[i], strlen(invalid[i]))) {
+		if (!strncmp(sym, invalid[i], strlen(invalid[i])))
 			return 0;
-		}
-	}
 
 	return 1;
 }
@@ -46,12 +45,13 @@ get_layout(char *syms, int grp_num)
 }
 
 const char *
-keymap(void)
+keymap(const char *unused)
 {
 	Display *dpy;
 	XkbDescRec *desc;
 	XkbStateRec state;
-	char *symbols, *layout;
+	char *symbols;
+	const char *layout;
 
 	layout = NULL;
 
@@ -75,13 +75,12 @@ keymap(void)
 		warn("XGetAtomName: Failed to get atom name");
 		goto end;
 	}
-	layout = (char *)bprintf("%s", get_layout(symbols, state.group));
+	layout = bprintf("%s", get_layout(symbols, state.group));
 	XFree(symbols);
 end:
 	XkbFreeKeyboard(desc, XkbSymbolsNameMask, 1);
-	if (XCloseDisplay(dpy)) {
+	if (XCloseDisplay(dpy))
 		warn("XCloseDisplay: Failed to close display");
-	}
 
 	return layout;
 }

components/load_avg.c

@@ -2,10 +2,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
-load_avg(void)
+load_avg(const char *unused)
 {
 	double avgs[3];
 

components/netspeeds.c

@@ -1,12 +1,16 @@
 /* See LICENSE file for copyright and license details. */
-#include <stdio.h>
 #include <limits.h>
+#include <stdio.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(__linux__)
 	#include <stdint.h>
 
+	#define NET_RX_BYTES "/sys/class/net/%s/statistics/rx_bytes"
+	#define NET_TX_BYTES "/sys/class/net/%s/statistics/tx_bytes"
+
 	const char *
 	netspeed_rx(const char *interface)
 	{
@@ -17,17 +21,12 @@
 
 		oldrxbytes = rxbytes;
 
-		if (esnprintf(path, sizeof(path),
+		if (esnprintf(path, sizeof(path), NET_RX_BYTES, interface) < 0)
-		              "/sys/class/net/%s/statistics/rx_bytes",
-		              interface) < 0) {
 			return NULL;
-		}
+		if (pscanf(path, "%ju", &rxbytes) != 1)
-		if (pscanf(path, "%ju", &rxbytes) != 1) {
 			return NULL;
-		}
+		if (oldrxbytes == 0)
-		if (oldrxbytes == 0) {
 			return NULL;
-		}
 
 		return fmt_human((rxbytes - oldrxbytes) * 1000 / interval,
 		                 1024);
@@ -43,27 +42,22 @@
 
 		oldtxbytes = txbytes;
 
-		if (esnprintf(path, sizeof(path),
+		if (esnprintf(path, sizeof(path), NET_TX_BYTES, interface) < 0)
-		              "/sys/class/net/%s/statistics/tx_bytes",
-		              interface) < 0) {
 			return NULL;
-		}
+		if (pscanf(path, "%ju", &txbytes) != 1)
-		if (pscanf(path, "%ju", &txbytes) != 1) {
 			return NULL;
-		}
+		if (oldtxbytes == 0)
-		if (oldtxbytes == 0) {
 			return NULL;
-		}
 
 		return fmt_human((txbytes - oldtxbytes) * 1000 / interval,
 		                 1024);
 	}
 #elif defined(__OpenBSD__) | defined(__FreeBSD__)
-	#include <string.h>
 	#include <ifaddrs.h>
+	#include <net/if.h>
+	#include <string.h>
 	#include <sys/types.h>
 	#include <sys/socket.h>
-	#include <net/if.h>
 
 	const char *
 	netspeed_rx(const char *interface)
@@ -77,25 +71,23 @@
 
 		oldrxbytes = rxbytes;
 
-		if (getifaddrs(&ifal) == -1) {
+		if (getifaddrs(&ifal) < 0) {
 			warn("getifaddrs failed");
 			return NULL;
 		}
 		rxbytes = 0;
-		for (ifa = ifal; ifa; ifa = ifa->ifa_next) {
+		for (ifa = ifal; ifa; ifa = ifa->ifa_next)
 			if (!strcmp(ifa->ifa_name, interface) &&
-			   (ifd = (struct if_data *)ifa->ifa_data)) {
+			   (ifd = (struct if_data *)ifa->ifa_data))
 				rxbytes += ifd->ifi_ibytes, if_ok = 1;
-			}
+
-		}
 		freeifaddrs(ifal);
 		if (!if_ok) {
 			warn("reading 'if_data' failed");
 			return NULL;
 		}
-		if (oldrxbytes == 0) {
+		if (oldrxbytes == 0)
 			return NULL;
-		}
 
 		return fmt_human((rxbytes - oldrxbytes) * 1000 / interval,
 		                 1024);
@@ -113,25 +105,23 @@
 
 		oldtxbytes = txbytes;
 
-		if (getifaddrs(&ifal) == -1) {
+		if (getifaddrs(&ifal) < 0) {
 			warn("getifaddrs failed");
 			return NULL;
 		}
 		txbytes = 0;
-		for (ifa = ifal; ifa; ifa = ifa->ifa_next) {
+		for (ifa = ifal; ifa; ifa = ifa->ifa_next)
 			if (!strcmp(ifa->ifa_name, interface) &&
-			   (ifd = (struct if_data *)ifa->ifa_data)) {
+			   (ifd = (struct if_data *)ifa->ifa_data))
 				txbytes += ifd->ifi_obytes, if_ok = 1;
-			}
+
-		}
 		freeifaddrs(ifal);
 		if (!if_ok) {
 			warn("reading 'if_data' failed");
 			return NULL;
 		}
-		if (oldtxbytes == 0) {
+		if (oldtxbytes == 0)
 			return NULL;
-		}
 
 		return fmt_human((txbytes - oldtxbytes) * 1000 / interval,
 		                 1024);

components/num_files.c

@@ -3,29 +3,30 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
 num_files(const char *path)
 {
 	struct dirent *dp;
-	DIR *fd;
+	DIR *dir;
 	int num;
 
-	if (!(fd = opendir(path))) {
+	if (!(dir = opendir(path))) {
 		warn("opendir '%s':", path);
 		return NULL;
 	}
 
 	num = 0;
-	while ((dp = readdir(fd))) {
+	while ((dp = readdir(dir))) {
-		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) {
+		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 			continue; /* skip self and parent */
-		}
+
 		num++;
 	}
 
-	closedir(fd);
+	closedir(dir);
 
 	return bprintf("%d", num);
 }

components/ram.c

@@ -1,13 +1,14 @@
 /* See LICENSE file for copyright and license details. */
 #include <stdio.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(__linux__)
 	#include <stdint.h>
 
 	const char *
-	ram_free(void)
+	ram_free(const char *unused)
 	{
 		uintmax_t free;
 
@@ -15,17 +16,17 @@
 		           "MemTotal: %ju kB\n"
 		           "MemFree: %ju kB\n"
 		           "MemAvailable: %ju kB\n",
-		           &free, &free, &free) != 3) {
+		           &free, &free, &free) != 3)
 			return NULL;
-		}
 
 		return fmt_human(free * 1024, 1024);
 	}
 
 	const char *
-	ram_perc(void)
+	ram_perc(const char *unused)
 	{
 		uintmax_t total, free, buffers, cached;
+		int percent;
 
 		if (pscanf("/proc/meminfo",
 		           "MemTotal: %ju kB\n"
@@ -33,35 +34,32 @@
 		           "MemAvailable: %ju kB\n"
 		           "Buffers: %ju kB\n"
 		           "Cached: %ju kB\n",
-		           &total, &free, &buffers, &buffers, &cached) != 5) {
+		           &total, &free, &buffers, &buffers, &cached) != 5)
 			return NULL;
-		}
 
-		if (total == 0) {
+		if (total == 0)
 			return NULL;
-		}
 
-		return bprintf("%d", 100 * ((total - free) - (buffers + cached))
+		percent = 100 * ((total - free) - (buffers + cached)) / total;
-                               / total);
+		return bprintf("%d", percent);
 	}
 
 	const char *
-	ram_total(void)
+	ram_total(const char *unused)
 	{
 		uintmax_t total;
 
 		if (pscanf("/proc/meminfo", "MemTotal: %ju kB\n", &total)
-		    != 1) {
+		    != 1)
 			return NULL;
-		}
 
 		return fmt_human(total * 1024, 1024);
 	}
 
 	const char *
-	ram_used(void)
+	ram_used(const char *unused)
 	{
-		uintmax_t total, free, buffers, cached;
+		uintmax_t total, free, buffers, cached, used;
 
 		if (pscanf("/proc/meminfo",
 		           "MemTotal: %ju kB\n"
@@ -69,12 +67,11 @@
 		           "MemAvailable: %ju kB\n"
 		           "Buffers: %ju kB\n"
 		           "Cached: %ju kB\n",
-		           &total, &free, &buffers, &buffers, &cached) != 5) {
+		           &total, &free, &buffers, &buffers, &cached) != 5)
 			return NULL;
-		}
 
-		return fmt_human((total - free - buffers - cached) * 1024,
+		used = (total - free - buffers - cached);
-		                 1024);
+		return fmt_human(used * 1024, 1024);
 	}
 #elif defined(__OpenBSD__)
 	#include <stdlib.h>
@@ -93,68 +90,61 @@
 
 		size = sizeof(*uvmexp);
 
-		if (sysctl(uvmexp_mib, 2, uvmexp, &size, NULL, 0) >= 0) {
+		if (sysctl(uvmexp_mib, 2, uvmexp, &size, NULL, 0) >= 0)
 			return 1;
-		}
 
 		return 0;
 	}
 
 	const char *
-	ram_free(void)
+	ram_free(const char *unused)
 	{
 		struct uvmexp uvmexp;
 		int free_pages;
 
-		if (load_uvmexp(&uvmexp)) {
+		if (!load_uvmexp(&uvmexp))
+			return NULL;
+
 		free_pages = uvmexp.npages - uvmexp.active;
 		return fmt_human(pagetok(free_pages, uvmexp.pageshift) *
 				 1024, 1024);
 	}
 
-		return NULL;
-	}
-
 	const char *
-	ram_perc(void)
+	ram_perc(const char *unused)
 	{
 		struct uvmexp uvmexp;
 		int percent;
 
-		if (load_uvmexp(&uvmexp)) {
+		if (!load_uvmexp(&uvmexp))
+			return NULL;
+
 		percent = uvmexp.active * 100 / uvmexp.npages;
 		return bprintf("%d", percent);
 	}
 
-		return NULL;
-	}
-
 	const char *
-	ram_total(void)
+	ram_total(const char *unused)
 	{
 		struct uvmexp uvmexp;
 
-		if (load_uvmexp(&uvmexp)) {
+		if (!load_uvmexp(&uvmexp))
+			return NULL;
+
 		return fmt_human(pagetok(uvmexp.npages,
-			                         uvmexp.pageshift) * 1024,
+					 uvmexp.pageshift) * 1024, 1024);
-			                 1024);
-		}
-
-		return NULL;
 	}
 
 	const char *
-	ram_used(void)
+	ram_used(const char *unused)
 	{
 		struct uvmexp uvmexp;
 
-		if (load_uvmexp(&uvmexp)) {
+		if (!load_uvmexp(&uvmexp))
-			return fmt_human(pagetok(uvmexp.active,
-			                         uvmexp.pageshift) * 1024,
-			                 1024);
-		}
-
 			return NULL;
+
+		return fmt_human(pagetok(uvmexp.active,
+					 uvmexp.pageshift) * 1024, 1024);
 	}
 #elif defined(__FreeBSD__)
 	#include <sys/sysctl.h>
@@ -163,13 +153,13 @@
 	#include <vm/vm_param.h>
 
 	const char *
-	ram_free(void) {
+	ram_free(const char *unused) {
 		struct vmtotal vm_stats;
 		int mib[] = {CTL_VM, VM_TOTAL};
 		size_t len;
 
 		len = sizeof(struct vmtotal);
-		if (sysctl(mib, 2, &vm_stats, &len, NULL, 0) == -1
+		if (sysctl(mib, 2, &vm_stats, &len, NULL, 0) < 0
 		    || !len)
 			return NULL;
 
@@ -177,44 +167,44 @@
 	}
 
 	const char *
-	ram_total(void) {
+	ram_total(const char *unused) {
-		long npages;
+		unsigned int npages;
 		size_t len;
 
 		len = sizeof(npages);
-		if (sysctlbyname("vm.stats.vm.v_page_count", &npages, &len, NULL, 0) == -1
+		if (sysctlbyname("vm.stats.vm.v_page_count",
-				|| !len)
+		                 &npages, &len, NULL, 0) < 0 || !len)
 			return NULL;
 
 		return fmt_human(npages * getpagesize(), 1024);
 	}
 
 	const char *
-	ram_perc(void) {
+	ram_perc(const char *unused) {
-		long npages;
+		unsigned int npages;
-		long active;
+		unsigned int active;
 		size_t len;
 
 		len = sizeof(npages);
-		if (sysctlbyname("vm.stats.vm.v_page_count", &npages, &len, NULL, 0) == -1
+		if (sysctlbyname("vm.stats.vm.v_page_count",
-				|| !len)
+		                 &npages, &len, NULL, 0) < 0 || !len)
 			return NULL;
 
-		if (sysctlbyname("vm.stats.vm.v_active_count", &active, &len, NULL, 0) == -1
+		if (sysctlbyname("vm.stats.vm.v_active_count",
-				|| !len)
+		                 &active, &len, NULL, 0) < 0 || !len)
 			return NULL;
 
 		return bprintf("%d", active * 100 / npages);
 	}
 
 	const char *
-	ram_used(void) {
+	ram_used(const char *unused) {
-		long active;
+		unsigned int active;
 		size_t len;
 
 		len = sizeof(active);
-		if (sysctlbyname("vm.stats.vm.v_active_count", &active, &len, NULL, 0) == -1
+		if (sysctlbyname("vm.stats.vm.v_active_count",
-				|| !len)
+		                 &active, &len, NULL, 0) < 0 || !len)
 			return NULL;
 
 		return fmt_human(active * getpagesize(), 1024);

components/run_command.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
@@ -14,17 +15,17 @@ run_command(const char *cmd)
 		warn("popen '%s':", cmd);
 		return NULL;
 	}
+
 	p = fgets(buf, sizeof(buf) - 1, fp);
 	if (pclose(fp) < 0) {
 		warn("pclose '%s':", cmd);
 		return NULL;
 	}
-	if (!p) {
+	if (!p)
 		return NULL;
-	}
+
-	if ((p = strrchr(buf, '\n'))) {
+	if ((p = strrchr(buf, '\n')))
 		p[0] = '\0';
-	}
 
 	return buf[0] ? buf : NULL;
 }

components/separator.c

@@ -1,10 +0,0 @@
-/* See LICENSE file for copyright and license details. */
-#include <stdio.h>
-
-#include "../util.h"
-
-const char *
-separator(const char *separator)
-{
-    return separator;
-}

components/swap.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(__linux__)
@@ -24,11 +25,9 @@
 		char *line = NULL;
 
 		/* get number of fields we want to extract */
-		for (i = 0, left = 0; i < LEN(ent); i++) {
+		for (i = 0, left = 0; i < LEN(ent); i++)
-			if (ent[i].var) {
+			if (ent[i].var)
 				left++;
-			}
-		}
 
 		if (!(fp = fopen("/proc/meminfo", "r"))) {
 			warn("fopen '/proc/meminfo':");
@@ -58,49 +57,45 @@
 	}
 
 	const char *
-	swap_free(void)
+	swap_free(const char *unused)
 	{
 		long free;
 
-		if (get_swap_info(NULL, &free, NULL)) {
+		if (get_swap_info(NULL, &free, NULL))
 			return NULL;
-		}
 
 		return fmt_human(free * 1024, 1024);
 	}
 
 	const char *
-	swap_perc(void)
+	swap_perc(const char *unused)
 	{
 		long total, free, cached;
 
-		if (get_swap_info(&total, &free, &cached) || total == 0) {
+		if (get_swap_info(&total, &free, &cached) || total == 0)
 			return NULL;
-		}
 
 		return bprintf("%d", 100 * (total - free - cached) / total);
 	}
 
 	const char *
-	swap_total(void)
+	swap_total(const char *unused)
 	{
 		long total;
 
-		if (get_swap_info(&total, NULL, NULL)) {
+		if (get_swap_info(&total, NULL, NULL))
 			return NULL;
-		}
 
 		return fmt_human(total * 1024, 1024);
 	}
 
 	const char *
-	swap_used(void)
+	swap_used(const char *unused)
 	{
 		long total, free, cached;
 
-		if (get_swap_info(&total, &free, &cached)) {
+		if (get_swap_info(&total, &free, &cached))
 			return NULL;
-		}
 
 		return fmt_human((total - free - cached) * 1024, 1024);
 	}
@@ -147,62 +142,57 @@
 	}
 
 	const char *
-	swap_free(void)
+	swap_free(const char *unused)
 	{
 		int total, used;
 
-		if (getstats(&total, &used)) {
+		if (getstats(&total, &used))
 			return NULL;
-		}
 
 		return fmt_human((total - used) * 1024, 1024);
 	}
 
 	const char *
-	swap_perc(void)
+	swap_perc(const char *unused)
 	{
 		int total, used;
 
-		if (getstats(&total, &used)) {
+		if (getstats(&total, &used))
 			return NULL;
-		}
 
-		if (total == 0) {
+		if (total == 0)
 			return NULL;
-		}
 
 		return bprintf("%d", 100 * used / total);
 	}
 
 	const char *
-	swap_total(void)
+	swap_total(const char *unused)
 	{
 		int total, used;
 
-		if (getstats(&total, &used)) {
+		if (getstats(&total, &used))
 			return NULL;
-		}
 
 		return fmt_human(total * 1024, 1024);
 	}
 
 	const char *
-	swap_used(void)
+	swap_used(const char *unused)
 	{
 		int total, used;
 
-		if (getstats(&total, &used)) {
+		if (getstats(&total, &used))
 			return NULL;
-		}
 
 		return fmt_human(used * 1024, 1024);
 	}
 #elif defined(__FreeBSD__)
+	#include <fcntl.h>
+	#include <kvm.h>
 	#include <stdlib.h>
 	#include <sys/types.h>
-	#include <fcntl.h>
 	#include <unistd.h>
-	#include <kvm.h>
 
 	static int getswapinfo(struct kvm_swap *swap_info, size_t size)
 	{
@@ -214,7 +204,7 @@
 			return 0;
 		}
 
-		if(kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) == -1) {
+		if (kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) < 0) {
 			warn("kvm_getswapinfo:");
 			kvm_close(kd);
 			return 0;
@@ -225,7 +215,7 @@
 	}
 
 	const char *
-	swap_free(void)
+	swap_free(const char *unused)
 	{
 		struct kvm_swap swap_info[1];
 		long used, total;
@@ -240,7 +230,7 @@
 	}
 
 	const char *
-	swap_perc(void)
+	swap_perc(const char *unused)
 	{
 		struct kvm_swap swap_info[1];
 		long used, total;
@@ -255,7 +245,7 @@
 	}
 
 	const char *
-	swap_total(void)
+	swap_total(const char *unused)
 	{
 		struct kvm_swap swap_info[1];
 		long total;
@@ -269,7 +259,7 @@
 	}
 
 	const char *
-	swap_used(void)
+	swap_used(const char *unused)
 	{
 		struct kvm_swap swap_info[1];
 		long used;

components/temperature.c

@@ -1,6 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 #include <stddef.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 
@@ -12,9 +13,8 @@
 	{
 		uintmax_t temp;
 
-		if (pscanf(file, "%ju", &temp) != 1) {
+		if (pscanf(file, "%ju", &temp) != 1)
 			return NULL;
-		}
 
 		return bprintf("%ju", temp / 1000);
 	}
@@ -52,6 +52,8 @@
 	#include <stdlib.h>
 	#include <sys/sysctl.h>
 
+	#define ACPI_TEMP "hw.acpi.thermal.%s.temperature"
+
 	const char *
 	temp(const char *zone)
 	{
@@ -60,8 +62,8 @@
 		size_t len;
 
 		len = sizeof(temp);
-		snprintf(buf, sizeof(buf), "hw.acpi.thermal.%s.temperature", zone);
+		snprintf(buf, sizeof(buf), ACPI_TEMP, zone);
-		if (sysctlbyname(buf, &temp, &len, NULL, 0) == -1
+		if (sysctlbyname(buf, &temp, &len, NULL, 0) < 0
 				|| !len)
 			return NULL;
 

components/uptime.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <time.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #if defined(CLOCK_BOOTTIME)
@@ -14,14 +15,14 @@
 #endif
 
 const char *
-uptime(void)
+uptime(const char *unused)
 {
 	char warn_buf[256];
 	uintmax_t h, m;
 	struct timespec uptime;
 
 	if (clock_gettime(UPTIME_FLAG, &uptime) < 0) {
-		snprintf(warn_buf, 256, "clock_gettime %d", UPTIME_FLAG);
+		snprintf(warn_buf, sizeof(warn_buf), "clock_gettime %d", UPTIME_FLAG);
 		warn(warn_buf);
 		return NULL;
 	}

components/user.c

@@ -4,16 +4,17 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 const char *
-gid(void)
+gid(const char *unused)
 {
 	return bprintf("%d", getgid());
 }
 
 const char *
-username(void)
+username(const char *unused)
 {
 	struct passwd *pw;
 
@@ -26,7 +27,7 @@ username(void)
 }
 
 const char *
-uid(void)
+uid(const char *unused)
 {
 	return bprintf("%d", geteuid());
 }

components/volume.c

@@ -5,13 +5,14 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
-#if defined(__OpenBSD__)
+#if defined(__OpenBSD__) | defined(__FreeBSD__)
-	#include <sys/queue.h>
 	#include <poll.h>
 	#include <sndio.h>
 	#include <stdlib.h>
+	#include <sys/queue.h>
 
 	struct control {
 		LIST_ENTRY(control)	next;
@@ -161,6 +162,7 @@
 				if (sioctl_revents(hdl, pfds) & POLLHUP) {
 					warn("sndio: disconnected");
 					cleanup();
+					initialized = 0;
 					return NULL;
 				}
 			}

components/wifi.c

@@ -6,6 +6,7 @@
 #include <sys/socket.h>
 #include <unistd.h>
 
+#include "../slstatus.h"
 #include "../util.h"
 
 #define RSSI_TO_PERC(rssi) \
@@ -17,6 +18,8 @@
 	#include <limits.h>
 	#include <linux/wireless.h>
 
+	#define NET_OPERSTATE "/sys/class/net/%s/operstate"
+
 	const char *
 	wifi_perc(const char *interface)
 	{
@@ -27,37 +30,32 @@
 		char status[5];
 		FILE *fp;
 
-		if (esnprintf(path, sizeof(path), "/sys/class/net/%s/operstate",
+		if (esnprintf(path, sizeof(path), NET_OPERSTATE, interface) < 0)
-		              interface) < 0) {
 			return NULL;
-		}
 		if (!(fp = fopen(path, "r"))) {
 			warn("fopen '%s':", path);
 			return NULL;
 		}
 		p = fgets(status, 5, fp);
 		fclose(fp);
-		if (!p || strcmp(status, "up\n") != 0) {
+		if (!p || strcmp(status, "up\n") != 0)
 			return NULL;
-		}
 
 		if (!(fp = fopen("/proc/net/wireless", "r"))) {
 			warn("fopen '/proc/net/wireless':");
 			return NULL;
 		}
 
-		for (i = 0; i < 3; i++) {
+		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, interface))) {
+		fclose(fp);
+		if (i < 2 || !p)
+			return NULL;
+
+		if (!(datastart = strstr(buf, interface)))
 			return NULL;
-		}
 
 		datastart = (datastart+(strlen(interface)+1));
 		sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
@@ -77,9 +75,8 @@
 		memset(&wreq, 0, sizeof(struct iwreq));
 		wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 		if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s",
-		              interface) < 0) {
+		              interface) < 0)
 			return NULL;
-		}
 
 		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 			warn("socket 'AF_INET':");
@@ -94,9 +91,8 @@
 
 		close(sockfd);
 
-		if (!strcmp(id, "")) {
+		if (!strcmp(id, ""))
 			return NULL;
-		}
 
 		return id;
 	}
@@ -152,11 +148,11 @@
 		int q;
 
 		if (load_ieee80211_nodereq(interface, &nr)) {
-			if (nr.nr_max_rssi) {
+			if (nr.nr_max_rssi)
 				q = IEEE80211_NODEREQ_RSSI(&nr);
-			} else {
+			else
 				q = RSSI_TO_PERC(nr.nr_rssi);
-			}
+
 			return bprintf("%d", q);
 		}
 
@@ -168,9 +164,8 @@
 	{
 		struct ieee80211_nodereq nr;
 
-		if (load_ieee80211_nodereq(interface, &nr)) {
+		if (load_ieee80211_nodereq(interface, &nr))
 			return bprintf("%s", nr.nr_nwid);
-		}
 
 		return NULL;
 	}

config.def.h

@@ -14,16 +14,17 @@ static const char unknown_str[] = "n/a";
  *
  * battery_perc        battery percentage              battery name (BAT0)
  *                                                     NULL on OpenBSD/FreeBSD
- * battery_state       battery charging state          battery name (BAT0)
- *                                                     NULL on OpenBSD/FreeBSD
  * battery_remaining   battery remaining HH:MM         battery name (BAT0)
  *                                                     NULL on OpenBSD/FreeBSD
- * cpu_perc            cpu usage in percent            NULL
+ * battery_state       battery charging state          battery name (BAT0)
+ *                                                     NULL on OpenBSD/FreeBSD
+ * cat                 read arbitrary file             path
  * cpu_freq            cpu frequency in MHz            NULL
+ * cpu_perc            cpu usage in percent            NULL
  * datetime            date and time                   format string (%F %T)
  * disk_free           free disk space in GB           mountpoint path (/)
  * disk_perc           disk usage in percent           mountpoint path (/)
- * disk_total          total disk space in GB          mountpoint path (/")
+ * disk_total          total disk space in GB          mountpoint path (/)
  * disk_used           used disk space in GB           mountpoint path (/)
  * entropy             available entropy               NULL
  * gid                 GID of current user             NULL
@@ -45,7 +46,6 @@ static const char unknown_str[] = "n/a";
  * ram_total           total memory size in GB         NULL
  * ram_used            used memory in GB               NULL
  * run_command         custom shell command            command (echo foo)
- * separator           string to echo                  NULL
  * swap_free           free swap in GB                 NULL
  * swap_perc           swap usage in percent           NULL
  * swap_total          total swap size in GB           NULL
@@ -59,9 +59,9 @@ static const char unknown_str[] = "n/a";
  * uptime              system uptime                   NULL
  * username            username of current user        NULL
  * vol_perc            OSS/ALSA volume in percent      mixer file (/dev/mixer)
- *                                                     NULL on OpenBSD
+ *                                                     NULL on OpenBSD/FreeBSD
- * wifi_perc           WiFi signal in percent          interface name (wlan0)
  * wifi_essid          WiFi ESSID                      interface name (wlan0)
+ * wifi_perc           WiFi signal in percent          interface name (wlan0)
  */
 static const struct arg args[] = {
 	/* function format          argument */

config.mk

@@ -1,5 +1,5 @@
 # slstatus version
-VERSION = 0
+VERSION = 1.0
 
 # customize below to fit your system
 
@@ -11,11 +11,11 @@ X11INC = /usr/X11R6/include
 X11LIB = /usr/X11R6/lib
 
 # flags
-CPPFLAGS = -I$(X11INC) -D_DEFAULT_SOURCE
+CPPFLAGS = -I$(X11INC) -D_DEFAULT_SOURCE -DVERSION=\"${VERSION}\"
-CFLAGS   = -std=c99 -pedantic -Wall -Wextra -Os
+CFLAGS   = -std=c99 -pedantic -Wall -Wextra -Wno-unused-parameter -Os
 LDFLAGS  = -L$(X11LIB) -s
 # OpenBSD: add -lsndio
-# FreeBSD: add -lkvm
+# FreeBSD: add -lkvm -lsndio
 LDLIBS   = -lX11
 
 # compiler and linker

slstatus.1

@@ -1,22 +1,29 @@
-.Dd 2020-06-23
+.Dd 2023-04-23
 .Dt SLSTATUS 1
 .Os
 .Sh NAME
 .Nm slstatus
-.Nd suckless status monitor
+.Nd suckless status
 .Sh SYNOPSIS
 .Nm
 .Op Fl s
 .Op Fl 1
 .Sh DESCRIPTION
 .Nm
-is a suckless status monitor for window managers that use WM_NAME (e.g. dwm) or
+is a small tool for providing system status information to other programs
-stdin to fill the status bar.
+over the EWMH
+.Em WM_NAME
+property of the root window (used by
+.Xr dwm 1 ) or standard input/output. It is designed to be as efficient as possible by
+only issuing the minimum of system calls required.
+.P
 By default,
 .Nm
 outputs to WM_NAME.
 .Sh OPTIONS
 .Bl -tag -width Ds
+.It Fl v
+Print version information to stderr, then exit.
 .It Fl s
 Write to stdout instead of WM_NAME.
 .It Fl 1
@@ -26,3 +33,15 @@ Write once to stdout and quit.
 .Nm
 can be customized by creating a custom config.h and (re)compiling the source
 code. This keeps it fast, secure and simple.
+.Sh SIGNALS
+.Nm
+responds to the following signals:
+.Pp
+.Bl -tag -width TERM -compact
+.It USR1
+Triggers an instant redraw.
+.El
+.Sh AUTHORS
+See the LICENSE file for the authors.
+.Sh SEE ALSO
+.Xr dwm 1

slstatus.c

@@ -12,7 +12,7 @@
 #include "util.h"
 
 struct arg {
-	const char *(*func)();
+	const char *(*func)(const char *);
 	const char *fmt;
 	const char *args;
 };
@@ -41,7 +41,7 @@ difftimespec(struct timespec *res, struct timespec *a, struct timespec *b)
 static void
 usage(void)
 {
-	die("usage: %s [-s] [-1]", argv0);
+	die("usage: %s [-v] [-s] [-1]", argv0);
 }
 
 int
@@ -56,9 +56,11 @@ main(int argc, char *argv[])
 
 	sflag = 0;
 	ARGBEGIN {
+	case 'v':
+		die("slstatus-"VERSION);
 	case '1':
 		done = 1;
-			/* fallthrough */
+		/* FALLTHROUGH */
 	case 's':
 		sflag = 1;
 		break;
@@ -66,9 +68,8 @@ main(int argc, char *argv[])
 		usage();
 	} ARGEND
 
-	if (argc) {
+	if (argc)
 		usage();
-	}
 
 	memset(&act, 0, sizeof(act));
 	act.sa_handler = terminate;
@@ -77,24 +78,22 @@ main(int argc, char *argv[])
 	act.sa_flags |= SA_RESTART;
 	sigaction(SIGUSR1, &act, NULL);
 
-	if (!sflag && !(dpy = XOpenDisplay(NULL))) {
+	if (!sflag && !(dpy = XOpenDisplay(NULL)))
 		die("XOpenDisplay: Failed to open display");
-	}
 
 	do {
-		if (clock_gettime(CLOCK_MONOTONIC, &start) < 0) {
+		if (clock_gettime(CLOCK_MONOTONIC, &start) < 0)
 			die("clock_gettime:");
-		}
 
 		status[0] = '\0';
 		for (i = len = 0; i < LEN(args); i++) {
-			if (!(res = args[i].func(args[i].args))) {
+			if (!(res = args[i].func(args[i].args)))
 				res = unknown_str;
-			}
+
 			if ((ret = esnprintf(status + len, sizeof(status) - len,
-			                    args[i].fmt, res)) < 0) {
+			                     args[i].fmt, res)) < 0)
 				break;
-			}
+
 			len += ret;
 		}
 
@@ -104,38 +103,32 @@ main(int argc, char *argv[])
 			if (ferror(stdout))
 				die("puts:");
 		} else {
-			if (XStoreName(dpy, DefaultRootWindow(dpy), status)
+			if (XStoreName(dpy, DefaultRootWindow(dpy), status) < 0)
-                            < 0) {
 				die("XStoreName: Allocation failed");
-			}
 			XFlush(dpy);
 		}
 
 		if (!done) {
-			if (clock_gettime(CLOCK_MONOTONIC, &current) < 0) {
+			if (clock_gettime(CLOCK_MONOTONIC, &current) < 0)
 				die("clock_gettime:");
-			}
 			difftimespec(&diff, &current, &start);
 
 			intspec.tv_sec = interval / 1000;
 			intspec.tv_nsec = (interval % 1000) * 1E6;
 			difftimespec(&wait, &intspec, &diff);
 
-			if (wait.tv_sec >= 0) {
+			if (wait.tv_sec >= 0 &&
-				if (nanosleep(&wait, NULL) < 0 &&
+			    nanosleep(&wait, NULL) < 0 &&
-				    errno != EINTR) {
+			    errno != EINTR)
 					die("nanosleep:");
 		}
-			}
-		}
 	} while (!done);
 
 	if (!sflag) {
 		XStoreName(dpy, DefaultRootWindow(dpy), NULL);
-		if (XCloseDisplay(dpy) < 0) {
+		if (XCloseDisplay(dpy) < 0)
 			die("XCloseDisplay: Failed to close display");
 	}
-	}
 
 	return 0;
 }

slstatus.h

@@ -2,12 +2,15 @@
 
 /* battery */
 const char *battery_perc(const char *);
-const char *battery_state(const char *);
 const char *battery_remaining(const char *);
+const char *battery_state(const char *);
+
+/* cat */
+const char *cat(const char *path);
 
 /* cpu */
-const char *cpu_freq(void);
+const char *cpu_freq(const char *unused);
-const char *cpu_perc(void);
+const char *cpu_perc(const char *unused);
 
 /* datetime */
 const char *datetime(const char *fmt);
@@ -19,26 +22,26 @@ const char *disk_total(const char *path);
 const char *disk_used(const char *path);
 
 /* entropy */
-const char *entropy(void);
+const char *entropy(const char *unused);
 
 /* hostname */
-const char *hostname(void);
+const char *hostname(const char *unused);
 
 /* ip */
 const char *ipv4(const char *interface);
 const char *ipv6(const char *interface);
 
 /* kernel_release */
-const char *kernel_release(void);
+const char *kernel_release(const char *unused);
 
 /* keyboard_indicators */
-const char *keyboard_indicators(void);
+const char *keyboard_indicators(const char *fmt);
 
 /* keymap */
-const char *keymap(void);
+const char *keymap(const char *unused);
 
 /* load_avg */
-const char *load_avg(void);
+const char *load_avg(const char *unused);
 
 /* netspeeds */
 const char *netspeed_rx(const char *interface);
@@ -48,37 +51,34 @@ const char *netspeed_tx(const char *interface);
 const char *num_files(const char *path);
 
 /* ram */
-const char *ram_free(void);
+const char *ram_free(const char *unused);
-const char *ram_perc(void);
+const char *ram_perc(const char *unused);
-const char *ram_total(void);
+const char *ram_total(const char *unused);
-const char *ram_used(void);
+const char *ram_used(const char *unused);
 
 /* run_command */
 const char *run_command(const char *cmd);
 
-/* separator */
-const char *separator(const char *separator);
-
 /* swap */
-const char *swap_free(void);
+const char *swap_free(const char *unused);
-const char *swap_perc(void);
+const char *swap_perc(const char *unused);
-const char *swap_total(void);
+const char *swap_total(const char *unused);
-const char *swap_used(void);
+const char *swap_used(const char *unused);
 
 /* temperature */
 const char *temp(const char *);
 
 /* uptime */
-const char *uptime(void);
+const char *uptime(const char *unused);
 
 /* user */
-const char *gid(void);
+const char *gid(const char *unused);
-const char *username(void);
+const char *uid(const char *unused);
-const char *uid(void);
+const char *username(const char *unused);
 
 /* volume */
 const char *vol_perc(const char *card);
 
 /* wifi */
-const char *wifi_perc(const char *interface);
 const char *wifi_essid(const char *interface);
+const char *wifi_perc(const char *interface);

util.c

@@ -13,10 +13,6 @@ char *argv0;
 static void
 verr(const char *fmt, va_list ap)
 {
-	if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
-		fprintf(stderr, "%s: ", argv0);
-	}
-
 	vfprintf(stderr, fmt, ap);
 
 	if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
@@ -119,9 +115,8 @@ fmt_human(uintmax_t num, int base)
 	}
 
 	scaled = num;
-	for (i = 0; i < prefixlen && scaled >= base; i++) {
+	for (i = 0; i < prefixlen && scaled >= base; i++)
 		scaled /= base;
-	}
 
 	return bprintf("%.1f %s", scaled, prefix[i]);
 }

util.h

@@ -3,7 +3,7 @@
 
 extern char buf[1024];
 
-#define LEN(x) (sizeof (x) / sizeof *(x))
+#define LEN(x) (sizeof(x) / sizeof((x)[0]))
 
 extern char *argv0;