Fix coding style

- Use block for single statement ifs
- Keep lines to reasonable length (current debate as to reasonable)
- When functions return -1 for error test against 0 not -1
- Do not indent cases another level
- Do not test against NULL and 0 explicitly
- Use tabs for indentation, use spaces for alignment

15 files changed, 91 insertions, 66 deletions

diff --git a/components/battery.c b/components/battery.c
index fe17a68..a63b9d0 100644
--- a/components/battery.c
+++ b/components/battery.c
@@ -16,8 +16,7 @@
 
 		snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/",
 		         bat, "/capacity");
-		return (pscanf(path, "%i", &perc) == 1) ?
-		       bprintf("%d", perc) : NULL;
+		return (pscanf(path, "%i", &perc) == 1) ? bprintf("%d", perc) : NULL;
 	}
 
 	const char *
diff --git a/components/cpu.c b/components/cpu.c
index c8299f9..3b29b8b 100644
--- a/components/cpu.c
+++ b/components/cpu.c
@@ -58,9 +58,8 @@
 
 		size = sizeof(freq);
 
-		if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
-			fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n",
-			        strerror(errno));
+		if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
+			fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n", strerror(errno));
 			return NULL;
 		}
 
@@ -82,7 +81,7 @@
 		size = sizeof(a);
 
 		memcpy(b, a, sizeof(b));
-		if (sysctl(mib, 2, &a, &size, NULL, 0) == -1) {
+		if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
 			fprintf(stderr, "sysctl 'KERN_CPTIME': %s\n", strerror(errno));
 			return NULL;
 		}
diff --git a/components/datetime.c b/components/datetime.c
index 0816923..713b0fb 100644
--- a/components/datetime.c
+++ b/components/datetime.c
@@ -9,8 +9,9 @@ datetime(const char *fmt)
 	time_t t;
 
 	t = time(NULL);
-	if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
+	if (!strftime(buf, sizeof(buf), fmt, localtime(&t))) {
 		return NULL;
+	}
 
 	return buf;
 }
diff --git a/components/disk.c b/components/disk.c
index 8a9caa1..2ce260b 100644
--- a/components/disk.c
+++ b/components/disk.c
@@ -16,7 +16,8 @@ disk_free(const char *mnt)
 		return NULL;
 	}
 
-	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
+	return bprintf("%f",
+	               (float)fs.f_bsize * (float)fs.f_bfree / 1024 / 1024 / 1024);
 }
 
 const char *
@@ -45,7 +46,8 @@ disk_total(const char *mnt)
 		return NULL;
 	}
 
-	return bprintf("%f", (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
+	return bprintf("%f",
+	               (float)fs.f_bsize * (float)fs.f_blocks / 1024 / 1024 / 1024);
 }
 
 const char *
@@ -58,5 +60,7 @@ disk_used(const char *mnt)
 		return NULL;
 	}
 
-	return bprintf("%f", (float)fs.f_bsize * ((float)fs.f_blocks - (float)fs.f_bfree) / 1024 / 1024 / 1024);
+	return bprintf("%f",
+	               (float)fs.f_bsize * ((float)fs.f_blocks -
+	               (float)fs.f_bfree) / 1024 / 1024 / 1024);
 }
diff --git a/components/hostname.c b/components/hostname.c
index d7c10c8..d41465f 100644
--- a/components/hostname.c
+++ b/components/hostname.c
@@ -9,7 +9,7 @@
 const char *
 hostname(void)
 {
-	if (gethostname(buf, sizeof(buf)) == -1) {
+	if (gethostname(buf, sizeof(buf)) < 0) {
 		fprintf(stderr, "gethostbyname: %s\n", strerror(errno));
 		return NULL;
 	}
diff --git a/components/ip.c b/components/ip.c
index b1f8a05..2d2cbde 100644
--- a/components/ip.c
+++ b/components/ip.c
@@ -18,17 +18,19 @@ ipv4(const char *iface)
 	int s;
 	char host[NI_MAXHOST];
 
-	if (getifaddrs(&ifaddr) == -1) {
+	if (getifaddrs(&ifaddr) < 0) {
 		fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
 		return NULL;
 	}
 
 	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-		if (ifa->ifa_addr == NULL) {
+		if (!ifa->ifa_addr) {
 			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)) {
+		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host,
+		                NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+		if (!strcmp(ifa->ifa_name, iface) &&
+		    (ifa->ifa_addr->sa_family == AF_INET)) {
 			if (s != 0) {
 				fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
 				return NULL;
@@ -49,17 +51,19 @@ ipv6(const char *iface)
 	int s;
 	char host[NI_MAXHOST];
 
-	if (getifaddrs(&ifaddr) == -1) {
+	if (getifaddrs(&ifaddr) < 0) {
 		fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
 		return NULL;
 	}
 
 	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-		if (ifa->ifa_addr == NULL) {
+		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, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
+		s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host,
+		                NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+		if (!strcmp(ifa->ifa_name, iface) &&
+		    (ifa->ifa_addr->sa_family == AF_INET6)) {
 			if (s != 0) {
 				fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
 				return NULL;
diff --git a/components/keyboard_indicators.c b/components/keyboard_indicators.c
index ed4bc17..2f831c8 100644
--- a/components/keyboard_indicators.c
+++ b/components/keyboard_indicators.c
@@ -18,13 +18,13 @@ keyboard_indicators(void)
 	XCloseDisplay(dpy);
 
 	switch (state.led_mask) {
-		case 1:
-			return "c";
-		case 2:
-			return "n";
-		case 3:
-			return "cn";
-		default:
-			return "";
+	case 1:
+		return "c";
+	case 2:
+		return "n";
+	case 3:
+		return "cn";
+	default:
+		return "";
 	}
 }
diff --git a/components/num_files.c b/components/num_files.c
index acf9dfa..1a918ac 100644
--- a/components/num_files.c
+++ b/components/num_files.c
@@ -13,14 +13,15 @@ num_files(const char *dir)
 	DIR *fd;
 	int num = 0;
 
-	if ((fd = opendir(dir)) == NULL) {
+	if (!(fd = opendir(dir))) {
 		fprintf(stderr, "opendir '%s': %s\n", dir, strerror(errno));
 		return NULL;
 	}
 
-	while ((dp = readdir(fd)) != NULL) {
-		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
+	while ((dp = readdir(fd))) {
+		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) {
 			continue; /* skip self and parent */
+		}
 		num++;
 	}
 
diff --git a/components/run_command.c b/components/run_command.c
index e356620..1aaae20 100644
--- a/components/run_command.c
+++ b/components/run_command.c
@@ -17,10 +17,12 @@ run_command(const char *cmd)
 	}
 	p = fgets(buf, sizeof(buf) - 1, fp);
 	pclose(fp);
-	if (!p)
+	if (!p) {
 		return NULL;
-	if ((p = strrchr(buf, '\n')) != NULL)
+	}
+	if ((p = strrchr(buf, '\n'))) {
 		p[0] = '\0';
+	}
 
 	return buf[0] ? buf : NULL;
 }
diff --git a/components/swap.c b/components/swap.c
index f6f8993..031b713 100644
--- a/components/swap.c
+++ b/components/swap.c
@@ -13,13 +13,11 @@
 		size_t bytes_read;
 
 		if (!(fp = fopen(path, "r"))) {
-			fprintf(stderr, "fopen '%s': %s\n", path,
-			        strerror(errno));
+			fprintf(stderr, "fopen '%s': %s\n", path, strerror(errno));
 			return 0;
 		}
-		if ((bytes_read = fread(buf, sizeof(char), bufsiz, fp)) == 0) {
-			fprintf(stderr, "fread '%s': %s\n", path,
-			        strerror(errno));
+		if (!(bytes_read = fread(buf, sizeof(char), bufsiz, fp))) {
+			fprintf(stderr, "fread '%s': %s\n", path, strerror(errno));
 			fclose(fp);
 			return 0;
 		}
@@ -40,12 +38,14 @@
 			return NULL;
 		}
 
-		if ((match = strstr(buf, "SwapTotal")) == NULL)
+		if (!(match = strstr(buf, "SwapTotal"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-		if ((match = strstr(buf, "SwapFree")) == NULL)
+		if (!(match = strstr(buf, "SwapFree"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapFree: %ld kB\n", &free);
 
 		return bprintf("%f", (float)free / 1024 / 1024);
@@ -61,16 +61,19 @@
 			return NULL;
 		}
 
-		if ((match = strstr(buf, "SwapTotal")) == NULL)
+		if (!(match = strstr(buf, "SwapTotal"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-		if ((match = strstr(buf, "SwapCached")) == NULL)
+		if (!(match = strstr(buf, "SwapCached"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapCached: %ld kB\n", &cached);
 
-		if ((match = strstr(buf, "SwapFree")) == NULL)
+		if (!(match = strstr(buf, "SwapFree"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapFree: %ld kB\n", &free);
 
 		return bprintf("%d", 100 * (total - free - cached) / total);
@@ -86,8 +89,9 @@
 			return NULL;
 		}
 
-		if ((match = strstr(buf, "SwapTotal")) == NULL)
+		if (!(match = strstr(buf, "SwapTotal"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapTotal: %ld kB\n", &total);
 
 		return bprintf("%f", (float)total / 1024 / 1024);
@@ -103,16 +107,19 @@
 			return NULL;
 		}
 
-		if ((match = strstr(buf, "SwapTotal")) == NULL)
+		if (!(match = strstr(buf, "SwapTotal"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-		if ((match = strstr(buf, "SwapCached")) == NULL)
+		if (!(match = strstr(buf, "SwapCached"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapCached: %ld kB\n", &cached);
 
-		if ((match = strstr(buf, "SwapFree")) == NULL)
+		if (!(match = strstr(buf, "SwapFree"))) {
 			return NULL;
+		}
 		sscanf(match, "SwapFree: %ld kB\n", &free);
 
 		return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
@@ -133,19 +140,23 @@
 		int rnswap, nswap, i;
 
 		nswap = swapctl(SWAP_NSWAP, 0, 0);
-		if (nswap < 1)
+		if (nswap < 1) {
 			fprintf(stderr, "swaptctl 'SWAP_NSWAP': %s\n", strerror(errno));
+		}
 
 		fsep = sep = calloc(nswap, sizeof(*sep));
-		if (sep == NULL)
+		if (!sep) {
 			fprintf(stderr, "calloc 'nswap': %s\n", strerror(errno));
+		}
 
 		rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
-		if (rnswap < 0)
+		if (rnswap < 0) {
 			fprintf(stderr, "swapctl 'SWAP_STATA': %s\n", strerror(errno));
+		}
 
-		if (nswap != rnswap)
+		if (nswap != rnswap) {
 			fprintf(stderr, "SWAP_STATS != SWAP_NSWAP\n");
+		}
 
 		*total = 0;
 		*used = 0;
diff --git a/components/temperature.c b/components/temperature.c
index 1353993..720f1b7 100644
--- a/components/temperature.c
+++ b/components/temperature.c
@@ -35,7 +35,7 @@
 
 		size = sizeof(temp);
 
-		if (sysctl(mib, 5, &temp, &size, NULL, 0) == -1) {
+		if (sysctl(mib, 5, &temp, &size, NULL, 0) < 0) {
 			fprintf(stderr, "sysctl 'SENSOR_TEMP': %s\n",
 			        strerror(errno));
 			return NULL;
diff --git a/components/uptime.c b/components/uptime.c
index f662b40..981f3cd 100644
--- a/components/uptime.c
+++ b/components/uptime.c
@@ -49,7 +49,7 @@ format(int uptime)
 
 		size = sizeof(boottime);
 
-		if (sysctl(mib, 2, &boottime, &size, NULL, 0) == -1) {
+		if (sysctl(mib, 2, &boottime, &size, NULL, 0) < 0) {
 			fprintf(stderr, "sysctl 'KERN_BOOTTIME': %s\n", strerror(errno));
 			return NULL;
 		}
diff --git a/components/volume.c b/components/volume.c
index 41a112d..b2ffb40 100644
--- a/components/volume.c
+++ b/components/volume.c
@@ -20,21 +20,22 @@ vol_perc(const char *card)
 	int v, afd, devmask;
 	char *vnames[] = SOUND_DEVICE_NAMES;
 
-	afd = open(card, O_RDONLY | O_NONBLOCK);
-	if (afd == -1) {
+	if ((afd = open(card, O_RDONLY | O_NONBLOCK)) < 0) {
 		fprintf(stderr, "open '%s': %s\n", card, strerror(errno));
 		return NULL;
 	}
 
-	if (ioctl(afd, (int)SOUND_MIXER_READ_DEVMASK, &devmask) == -1) {
-		fprintf(stderr, "ioctl 'SOUND_MIXER_READ_DEVMASK': %s\n", strerror(errno));
+	if (ioctl(afd, (int)SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+		fprintf(stderr, "ioctl 'SOUND_MIXER_READ_DEVMASK': %s\n",
+		        strerror(errno));
 		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) {
-				fprintf(stderr, "ioctl 'MIXER_READ(%d)': %s\n", i, strerror(errno));
+			if (ioctl(afd, MIXER_READ(i), &v) < 0) {
+				fprintf(stderr, "ioctl 'MIXER_READ(%d)': %s\n", i,
+				        strerror(errno));
 				close(afd);
 				return NULL;
 			}
diff --git a/components/wifi.c b/components/wifi.c
index 7cd2702..c209598 100644
--- a/components/wifi.c
+++ b/components/wifi.c
@@ -47,11 +47,13 @@
 				break;
 		}
 		fclose(fp);
-		if (i < 2 || !p)
+		if (i < 2 || !p) {
 			return NULL;
+		}
 
-		if ((datastart = strstr(buf, iface)) == NULL)
+		if (!(datastart = strstr(buf, iface))) {
 			return NULL;
+		}
 
 		datastart = (datastart+(strlen(iface)+1));
 		sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
@@ -73,23 +75,23 @@
 		wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 		snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 
-		if (sockfd == -1) {
+		if (sockfd < 0) {
 			fprintf(stderr, "socket 'AF_INET': %s\n",
 			        strerror(errno));
 			return NULL;
 		}
 		wreq.u.essid.pointer = id;
-		if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
-			fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n",
-			        strerror(errno));
+		if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
+			fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n", strerror(errno));
 			close(sockfd);
 			return NULL;
 		}
 
 		close(sockfd);
 
-		if (strcmp(id, "") == 0)
+		if (!strcmp(id, "")) {
 			return NULL;
+		}
 
 		return id;
 	}
diff --git a/util.c b/util.c
index 6008ffc..8808aba 100644
--- a/util.c
+++ b/util.c
@@ -16,8 +16,9 @@ bprintf(const char *fmt, ...)
 	len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 	va_end(ap);
 
-	if (len >= sizeof(buf))
+	if (len >= sizeof(buf)) {
 		buf[sizeof(buf)-1] = '\0';
+	}
 
 	return buf;
 }