status

/* made by profil 2011-12-29.
*
** Compile with:
** gcc -Wall -pedantic -std=c99 -lX11 status.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <X11/Xlib.h>
#include <string.h>
static Display *dpy;

void setstatus(char *str) {
    XStoreName(dpy, DefaultRootWindow(dpy), str);
    XSync(dpy, False);
}

float getfreq(char *file) {
    FILE *fd;
    char *freq;
    float ret;

    freq = malloc(10);
    fd = fopen(file, "r");
    if(fd == NULL) {
        fprintf(stderr, "Cannot open '%s' for reading.\n", file);
        exit(1);
    }

    fgets(freq, 10, fd);
    fclose(fd);

    ret = atof(freq)/1000000;
    free(freq);
    return ret;
}

char *getdatetime() {
    char *buf;
    time_t result;
    struct tm *resulttm;

    if((buf = malloc(sizeof(char)*65)) == NULL) {
        fprintf(stderr, "Cannot allocate memory for buf.\n");
        exit(1);
    }
    result = time(NULL);
    resulttm = localtime(&result);
    if(resulttm == NULL) {
        fprintf(stderr, "Error getting localtime.\n");
        exit(1);
    }
    if(!strftime(buf, sizeof(char)*65-1, "%a %b %d %H:%M:%S", resulttm)) {
        fprintf(stderr, "strftime is 0.\n");
        exit(1);
    }

    return buf;
}

int getbattery() {
    FILE *fd;
    int energy_now, energy_full, voltage_now;

    fd = fopen("/sys/class/power_supply/BAT0/charge_now", "r");
    if(fd == NULL) {
        fprintf(stderr, "Error opening charge_now.\n");
        return -1;
    }
    fscanf(fd, "%d", &energy_now);
    fclose(fd);


    fd = fopen("/sys/class/power_supply/BAT0/charge_full", "r");
    if(fd == NULL) {
        fprintf(stderr, "Error opening charge_full.\n");
        return -1;
    }
    fscanf(fd, "%d", &energy_full);
    fclose(fd);


    fd = fopen("/sys/class/power_supply/BAT0/voltage_now", "r");
    if(fd == NULL) {
        fprintf(stderr, "Error opening voltage_now.\n");
        return -1;
    }
    fscanf(fd, "%d", &voltage_now);
    fclose(fd);


    return ((float)energy_now * 1000 / (float)voltage_now) * 100 / ((float)energy_full * 1000 / (float)voltage_now);
}

int chargingStatus(char* stat){
    FILE *fd;
    fd = fopen("/sys/class/power_supply/BAT0/status", "r");
    if(fd == NULL){
        fprintf(stderr, "Error opening BAT0 status.\n");
        return -1;
    }
    fgets(stat, 20, fd);
    fclose(fd);
    return 0;
}
int main(void) {
    char *status;
    float cpu0, cpu1;
    char *datetime;
    char batstat[20];
    int bat0;

    if (!(dpy = XOpenDisplay(NULL))) {
        fprintf(stderr, "Cannot open display.\n");
        return 1;
    }

    if((status = malloc(200)) == NULL)
        exit(1);


    for (;;sleep(1)) {
        cpu0 = getfreq("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
        cpu1 = getfreq("/sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq");
        datetime = getdatetime();
        bat0 = getbattery();
        chargingStatus(batstat);
        snprintf(status, 200, "%0.2f, %0.2f | %d%% %s| %s", cpu0, cpu1, bat0, batstat,datetime);

        free(datetime);
        setstatus(status);
    }
    free(status);
    XCloseDisplay(dpy);

    return 0;
}