get_battery.c

static char *get_battery() {
    int capacity;
    FILE *capacity_file, *status_file;
    char bat_status[12] = "Unknown";

    if((capacity_file = fopen(BATTERY_DIRECTORY "/capacity", "r")) == NULL) {
        status = ENOENT;
        halt_and_catch_fire("unable to get battery information");
    }
    fscanf(capacity_file, "%d", &capacity);
    fclose(capacity_file);
    
    if((status_file = fopen(BATTERY_DIRECTORY "/status", "r")) != NULL) {
        fscanf(status_file, "%s", bat_status);
        fclose(status_file);
    }

    char *battery = malloc(BUF_SIZE);
    snprintf(battery, BUF_SIZE, "%d%% [%s]", capacity, bat_status);

    return battery;
}