+/* wifi percentage */
+char *
+get_wifi_signal()
+{
+ int bufsize = 255;
+ int strength;
+ char buf[bufsize];
+ char *datastart;
+ char path_start[16] = "/sys/class/net/";
+ char path_end[11] = "/operstate";
+ char path[32];
+ char status[5];
+ char needle[sizeof wificard + 1];
+ FILE *fp;
+
+ /* generate the path name */
+ memset(path, 0, sizeof path);
+ strcat(path, path_start);
+ strcat(path, wificard);
+ strcat(path, path_end);
+
+ /* 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);
+}
+
+/* main function */