Move components into dedicated subdirectory

This brings us a lot more tidiness.

components/wifi.c

@@ -0,0 +1,85 @@
+/* See LICENSE file for copyright and license details. */
+#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;
+}