+/* wifi percentage */
+char *
+wifi_perc(const char *wificard)
+{
+ int bufsize = 255;
+ int strength;
+ char buf[bufsize];
+ char *datastart;
+ char path[64];
+ char status[5];
+ char needle[sizeof wificard + 1];
+ FILE *fp;
+
+ /* generate the path name */
+ memset(path, 0, sizeof path);
+ strcat(path, "/sys/class/net/");
+ strcat(path, wificard);
+ strcat(path, "/operstate");
+
+ /* open wifi file */
+ if(!(fp = fopen(path, "r"))) {
+ fprintf(stderr, "Error opening wifi operstate file.");
+ return smprintf("n/a");
+ }
+
+ /* read the status */
+ fgets(status, 5, fp);
+
+ /* close wifi file */
+ fclose(fp);
+
+ /* check if interface down */
+ if(strcmp(status, "up\n") != 0){
+ return smprintf("n/a");
+ }
+
+ /* open wifi file */
+ if (!(fp = fopen("/proc/net/wireless", "r"))) {
+ fprintf(stderr, "Error opening wireless file.");
+ return smprintf("n/a");
+ }
+
+ /* extract the signal strength */
+ strcpy(needle, wificard);
+ strcat(needle, ":");
+ fgets(buf, bufsize, fp);
+ fgets(buf, bufsize, fp);
+ fgets(buf, bufsize, fp);
+ if ((datastart = strstr(buf, needle)) != NULL) {
+ datastart = strstr(buf, ":");
+ sscanf(datastart + 1, " %*d %d %*d %*d %*d %*d %*d %*d %*d %*d", &strength);
+ }
+
+ /* close wifi file */
+ fclose(fp);
+
+ /* return strength in percent */
+ return smprintf("%d%%", strength);
+}
+
+/* wifi essid */
+char *
+wifi_essid(const char *wificard)
+{
+ char *id = malloc(IW_ESSID_MAX_SIZE+1);
+ if (id == NULL) {
+ fprintf(stderr, "Cannot get ESSID.");
+ return smprintf("n/a");
+ }
+ int sockfd;
+ struct iwreq wreq;
+
+ /* prepare */
+ memset(&wreq, 0, sizeof(struct iwreq));
+ wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
+
+ /* set the interface */
+ sprintf(wreq.ifr_name, wificard);
+
+ /* check */
+ if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+ fprintf(stderr, "Cannot open socket for interface: %s\n", wificard);
+ return smprintf("n/a");
+ }
+ wreq.u.essid.pointer = id;
+ if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
+ fprintf(stderr, "Get ESSID ioctl failed for interface %s\n", wificard);
+ return smprintf("n/a");
+ }
+
+ /* return the essid */
+ if (strcmp((char *)wreq.u.essid.pointer, "") == 0) {
+ return smprintf("n/a");
+ }
+ else {
+ return smprintf("%s", (char *)wreq.u.essid.pointer);
+ }
+}
+
+/* main function */