Initial commit

Makefile

@@ -0,0 +1,2 @@
+all:
+	gcc -Wall -O2 -o wmiistatus wmiistatus.c

wmiistatus.c

@@ -0,0 +1,206 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+const char *wlan_interface = "wlan0";
+const char *eth_interface = "eth0";
+
+// TODO: run-watches, z.B.
+// "/var/run/dhcp*.pid" --> checkt ob's das file gibt, ob der prozess läuft und zeigt dann yes/no an
+// "/var/run/vpnc*.pid"
+
+char output[512];
+bool first_push = true;
+
+static char *skip_character(char *input, char character, int amount) {
+	char *walk;
+	int len = strlen(input),
+	    blanks = 0;
+
+	for (walk = input; ((walk - input) < len) && (blanks < amount); walk++)
+		if (*walk == character)
+			blanks++;
+
+	return (walk == input ? walk : walk-1);
+}
+
+static void push_part(const char *input, const int n) {
+	if (first_push)
+		first_push = false;
+	else
+		strncpy(output+strlen(output), " | ", strlen(" | "));
+	strncpy(output+strlen(output), input, n);
+}
+
+/*
+ * Get battery information from /sys. Note that it uses the design capacity to calculate the percentage,
+ * not the full capacity.
+ *
+ */
+static char *get_battery_info() {
+	char buf[1024];
+	static char output[512];
+	char *walk, *last = buf;
+	int fd = open("/sys/class/power_supply/BAT0/uevent", O_RDONLY);
+	int full_design = -1,
+	    remaining = -1,
+	    present_rate = -1;
+	bool charging = false;
+	memset(output, '\0', sizeof(output));
+	read(fd, buf, sizeof(buf));
+	for (walk = buf; (walk-buf) < 1024; walk++)
+		if (*walk == '=') {
+			if (strncmp(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN", strlen("POWER_SUPPLY_ENERGY_FULL_DESIGN")) == 0)
+				full_design = atoi(walk+1);
+			else if (strncmp(last, "POWER_SUPPLY_ENERGY_NOW", strlen("POWER_SUPPLY_ENERGY_NOW")) == 0)
+				remaining = atoi(walk+1);
+			else if (strncmp(last, "POWER_SUPPLY_CURRENT_NOW", strlen("POWER_SUPPLY_CURRENT_NOW")) == 0)
+				present_rate = atoi(walk+1);
+			else if (strncmp(last, "POWER_SUPPLY_STATUS=Charging", strlen("POWER_SUPPLY_STATUS=Charging")) == 0)
+				charging = true;
+		} else if (*walk == '\n')
+			last = walk+1;
+	close(fd);
+
+	if ((full_design != -1) && (remaining != -1) && (present_rate != -1)) {
+		float time, perc;
+		if (charging)
+			time = ((float)full_design - (float)remaining) / (float)present_rate;
+		else time = ((float)remaining / (float)present_rate);
+		perc = ((float)remaining / (float)full_design);
+
+		int seconds = (int)(time * 3600.0);
+		int hours = seconds / 3600;
+		seconds -= (hours * 3600);
+		int minutes = seconds / 60;
+		seconds -= (minutes * 60);
+
+		sprintf(output, "%s %.02f%% %02d:%02d:%02d", (charging ? "CHR" : "BAT"), (perc * 100), hours, minutes, seconds);
+	}
+	return output;
+}
+
+/*
+ * Just parses /proc/net/wireless
+ *
+ */
+static char *get_wireless_info() {
+	char buf[1024];
+	static char output[512];
+	char *interfaces;
+	memset(buf, '\0', sizeof(buf));
+	memset(output, '\0', sizeof(output));
+
+	int fd = open("/proc/net/wireless", O_RDONLY);
+	read(fd, buf, sizeof(buf));
+	close(fd);
+
+	interfaces = skip_character(buf, '\n', 2) + 1;
+	while (interfaces < buf+strlen(buf)) {
+		while (isspace((int)*interfaces))
+			interfaces++;
+		if (strncmp(interfaces, wlan_interface, strlen(wlan_interface)) == 0) {
+			/* Skip status field (0000) */
+			interfaces += strlen(wlan_interface) + 2;
+			interfaces = skip_character(interfaces, ' ', 1);
+			while (isspace((int)*interfaces))
+				interfaces++;
+			int quality = atoi(interfaces);
+			/* For some reason, I get 255 sometimes */
+			if (quality == 255)
+				quality = 0;
+			snprintf(output, sizeof(output), "W: (%02d%%) ", quality);
+			return output;
+		}
+		interfaces = skip_character(interfaces, '\n', 1) + 1;
+	}
+
+	return output;
+}
+
+static char *get_eth_info() {
+	static char output[512];
+	struct ifreq ifr;
+	memset(output, '\0', sizeof(output));
+
+	int fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+	strcpy(ifr.ifr_name, eth_interface);
+	if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
+		printf("böses fehler\n");
+		/* TODO: errorhandling */
+	}
+	if (!(ifr.ifr_flags & IFF_UP) ||
+	    !(ifr.ifr_flags & IFF_RUNNING)) {
+		sprintf(output, "E: down");
+		close(fd);
+		return output;
+	}
+
+	strcpy(ifr.ifr_name, eth_interface);
+	ifr.ifr_addr.sa_family = AF_INET;
+	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
+		struct sockaddr_in addr;
+		memcpy(&addr, &ifr.ifr_addr, sizeof(struct sockaddr_in));
+		inet_ntop(AF_INET, &addr.sin_addr.s_addr, output+3, sizeof(struct sockaddr_in));
+		strncpy(output, "E: ", strlen("E: "));
+		if (strlen(output) == 0)
+			sprintf(output, "E: no IP");
+	}
+
+	close(fd);
+	return output;
+}
+
+int main() {
+	char part[512],
+	     *end;
+
+	while (1) {
+		memset(output, '\0', sizeof(output));
+		first_push = true;
+
+		char *wireless_info = get_wireless_info();
+		push_part(wireless_info, strlen(wireless_info));
+
+		char *eth_info = get_eth_info();
+		push_part(eth_info, strlen(eth_info));
+
+		char *battery_info = get_battery_info();
+		push_part(battery_info, strlen(battery_info));
+
+		
+		/* Get load */
+		int load_avg = open("/proc/loadavg", O_RDONLY);
+		read(load_avg, part, sizeof(part));
+		close(load_avg);
+		end = skip_character(part, ' ', 3);
+		push_part(part, (end-part));
+
+		/* Get date & time */
+		time_t current_time = time(NULL);
+		struct tm *current_tm = localtime(&current_time);
+		strftime(part, sizeof(part), "%d.%m.%Y %H:%M:%S", current_tm);
+		push_part(part, strlen(part));
+
+		printf("output = %s\n", output);
+
+		int fd = open("/mnt/wmii/rbar/status", O_RDWR);
+		write(fd, output, strlen(output));
+		close(fd);
+
+		sleep(1);
+	}
+}