slstatus.c

   1 /* See LICENSE file for copyright and license details. */
   2
   3 /* global libraries */
   4 #include <alsa/asoundlib.h>
   5 #include <arpa/inet.h>
   6 #include <fcntl.h>
   7 #include <ifaddrs.h>
   8 #include <limits.h>
   9 #include <locale.h>
  10 #include <netdb.h>
  11 #include <stdarg.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/statvfs.h>
  18 #include <sys/socket.h>
  19 #include <time.h>
  20 #include <unistd.h>
  21 #include <X11/Xlib.h>
  22
  23 /* local headers */
  24 #include "slstatus.h"
  25 #include "config.h"
  26
  27 /* set statusbar */
  28 void
  29 setstatus(const char *str)
  30 {
  31     /* set WM_NAME via X11 */
  32     XStoreName(dpy, DefaultRootWindow(dpy), str);
  33     XSync(dpy, False);
  34 }
  35
  36 /* smprintf function */
  37 char *
  38 smprintf(const char *fmt, ...)
  39 {
  40     va_list fmtargs;
  41     char *ret = NULL;
  42
  43     va_start(fmtargs, fmt);
  44     if (vasprintf(&ret, fmt, fmtargs) < 0)
  45         return NULL;
  46     va_end(fmtargs);
  47
  48     return ret;
  49 }
  50
  51 /* battery percentage */
  52 char *
  53 battery_perc(const char *battery)
  54 {
  55     int now, full, perc;
  56     char batterynowfile[64] = "";
  57     char batteryfullfile[64] = "";
  58     FILE *fp;
  59
  60     /* generate battery nowfile path */
  61     strcat(batterynowfile, batterypath);
  62     strcat(batterynowfile, battery);
  63     strcat(batterynowfile, "/");
  64     strcat(batterynowfile, batterynow);
  65
  66     /* generate battery fullfile path */
  67     strcat(batteryfullfile, batterypath);
  68     strcat(batteryfullfile, battery);
  69     strcat(batteryfullfile, "/");
  70     strcat(batteryfullfile, batteryfull);
  71
  72     /* open battery now file */
  73     if (!(fp = fopen(batterynowfile, "r"))) {
  74         fprintf(stderr, "Error opening battery file.%s",batterynowfile);
  75         return smprintf("n/a");
  76     }
  77
  78     /* read value */
  79     fscanf(fp, "%i", &now);
  80
  81     /* close battery now file */
  82     fclose(fp);
  83
  84     /* open battery full file */
  85     if (!(fp = fopen(batteryfullfile, "r"))) {
  86         fprintf(stderr, "Error opening battery file.");
  87         return smprintf("n/a");
  88     }
  89
  90     /* read value */
  91     fscanf(fp, "%i", &full);
  92
  93     /* close battery full file */
  94     fclose(fp);
  95
  96     /* calculate percent */
  97     perc = now / (full / 100);
  98
  99     /* return perc as string */
 100     return smprintf("%d%%", perc);
 101 }
 102
 103 /* cpu percentage */
 104 char *
 105 cpu_perc(const char *null)
 106 {
 107     int perc;
 108     long double a[4], b[4];
 109     FILE *fp;
 110
 111     /* open stat file */
 112     if (!(fp = fopen("/proc/stat","r"))) {
 113         fprintf(stderr, "Error opening stat file.");
 114         return smprintf("n/a");
 115     }
 116
 117     /* read values */
 118     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 119
 120     /* close stat file */
 121     fclose(fp);
 122
 123     /* wait a second (for avg values) */
 124     sleep(1);
 125
 126     /* open stat file */
 127     if (!(fp = fopen("/proc/stat","r"))) {
 128         fprintf(stderr, "Error opening stat file.");
 129         return smprintf("n/a");
 130     }
 131
 132     /* read values */
 133     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 134
 135     /* close stat file */
 136     fclose(fp);
 137
 138     /* calculate avg in this second */
 139     perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
 140
 141     /* return perc as string */
 142     return smprintf("%d%%", perc);
 143 }
 144
 145 /* date and time */
 146 char *
 147 datetime(const char *timeformat)
 148 {
 149     time_t tm;
 150     size_t bufsize = 64;
 151     char *buf = malloc(bufsize);
 152
 153     /* get time in format */
 154     time(&tm);
 155     setlocale(LC_TIME, "");
 156     if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
 157         setlocale(LC_TIME, "C");
 158         fprintf(stderr, "Strftime failed.\n");
 159         return smprintf("n/a");
 160     }
 161
 162     setlocale(LC_TIME, "C");
 163     /* return time */
 164     char *ret = smprintf("%s", buf);
 165     free(buf);
 166     return ret;
 167 }
 168
 169 /* disk usage percentage */
 170 char *
 171 disk_perc(const char *mountpoint)
 172 {
 173     int perc = 0;
 174     struct statvfs fs;
 175
 176     /* try to open mountpoint */
 177     if (statvfs(mountpoint, &fs) < 0) {
 178         fprintf(stderr, "Could not get filesystem info.\n");
 179         return smprintf("n/a");
 180     }
 181
 182     /* calculate percent */
 183     perc = 100 * (1.0f - ((float)fs.f_bavail / (float)fs.f_blocks));
 184
 185     /* return perc */
 186     return smprintf("%d%%", perc);
 187 }
 188
 189 /* entropy available */
 190 char *
 191 entropy(const char *null)
 192 {
 193     int entropy = 0;
 194     FILE *fp;
 195
 196     /* open entropy file */
 197     if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
 198         fprintf(stderr, "Could not open entropy file.\n");
 199         return smprintf("n/a");
 200     }
 201
 202     /* extract entropy */
 203     fscanf(fp, "%d", &entropy);
 204
 205     /* close entropy file */
 206     fclose(fp);
 207
 208     /* return entropy */
 209     return smprintf("%d", entropy);
 210 }
 211
 212 /* hostname */
 213 char *
 214 hostname(const char *null)
 215 {
 216     char hostname[HOST_NAME_MAX];
 217     FILE *fp;
 218
 219     /* open hostname file */
 220     if (!(fp = fopen("/proc/sys/kernel/hostname", "r"))) {
 221         fprintf(stderr, "Could not open hostname file.\n");
 222         return smprintf("n/a");
 223     }
 224
 225     /* extract hostname */
 226     fscanf(fp, "%s\n", hostname);
 227
 228     /* close hostname file */
 229     fclose(fp);
 230
 231     /* return entropy */
 232     return smprintf("%s", hostname);
 233 }
 234
 235 /* ip address */
 236 char *
 237 ip(const char *interface)
 238 {
 239     struct ifaddrs *ifaddr, *ifa;
 240     int s;
 241     char host[NI_MAXHOST];
 242
 243     /* check if getting ip address works */
 244     if (getifaddrs(&ifaddr) == -1)
 245     {
 246         fprintf(stderr, "Error getting IP address.");
 247         return smprintf("n/a");
 248     }
 249
 250     /* get the ip address */
 251     for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
 252     {
 253         if (ifa->ifa_addr == NULL)
 254             continue;
 255
 256         s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
 257
 258         if ((strcmp(ifa->ifa_name, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET))
 259         {
 260             if (s != 0)
 261             {
 262                 fprintf(stderr, "Error getting IP address.");
 263                 return smprintf("n/a");
 264             }
 265             return smprintf("%s", host);
 266         }
 267     }
 268
 269     /* free the address */
 270     freeifaddrs(ifaddr);
 271
 272     /* return n/a if nothing works */
 273     return smprintf("n/a");
 274 }
 275
 276 /* ram percentage */
 277 char *
 278 ram_perc(const char *null)
 279 {
 280     int perc;
 281     long total, free, buffers, cached;
 282     FILE *fp;
 283
 284     /* open meminfo file */
 285     if (!(fp = fopen("/proc/meminfo", "r"))) {
 286         fprintf(stderr, "Error opening meminfo file.");
 287         return smprintf("n/a");
 288     }
 289
 290     /* read the values */
 291     fscanf(fp, "MemTotal: %ld kB\n", &total);
 292     fscanf(fp, "MemFree: %ld kB\n", &free);
 293     fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 294     fscanf(fp, "Cached: %ld kB\n", &cached);
 295
 296     /* close meminfo file */
 297     fclose(fp);
 298
 299     /* calculate percentage */
 300     perc = 100 * ((total - free) - (buffers + cached)) / total;
 301
 302     /* return perc as string */
 303     return smprintf("%d%%", perc);
 304 }
 305
 306 /* temperature */
 307 char *
 308 temp(const char *file)
 309 {
 310     int temperature;
 311     FILE *fp;
 312
 313     /* open temperature file */
 314     if (!(fp = fopen(file, "r"))) {
 315         fprintf(stderr, "Could not open temperature file.\n");
 316         return smprintf("n/a");
 317     }
 318
 319     /* extract temperature */
 320     fscanf(fp, "%d", &temperature);
 321
 322     /* close temperature file */
 323     fclose(fp);
 324
 325     /* return temperature in degrees */
 326     return smprintf("%d°C", temperature / 1000);
 327 }
 328
 329 /* alsa volume percentage */
 330 char *
 331 vol_perc(const char *soundcard)
 332 {
 333     int mute = 0;
 334     long vol = 0, max = 0, min = 0;
 335
 336     /* get volume from alsa */
 337     snd_mixer_t *handle;
 338     snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 339     snd_mixer_selem_id_t *vol_info, *mute_info;
 340     snd_mixer_open(&handle, 0);
 341     snd_mixer_attach(handle, soundcard);
 342     snd_mixer_selem_register(handle, NULL, NULL);
 343     snd_mixer_load(handle);
 344     snd_mixer_selem_id_malloc(&vol_info);
 345     snd_mixer_selem_id_malloc(&mute_info);
 346     snd_mixer_selem_id_set_name(vol_info, channel);
 347     snd_mixer_selem_id_set_name(mute_info, channel);
 348     pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 349     mas_mixer = snd_mixer_find_selem(handle, mute_info);
 350     snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 351     snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 352     snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 353     if (vol_info)
 354         snd_mixer_selem_id_free(vol_info);
 355     if (mute_info)
 356         snd_mixer_selem_id_free(mute_info);
 357     if (handle)
 358         snd_mixer_close(handle);
 359
 360     /* return the string (mute) */
 361     if (!mute)
 362         return smprintf("mute");
 363     else
 364         return smprintf("%d%%", (vol * 100) / max);
 365 }
 366
 367 /* wifi percentage */
 368 char *
 369 wifi_perc(const char *wificard)
 370 {
 371     int bufsize = 255;
 372     int strength;
 373     char buf[bufsize];
 374     char *datastart;
 375     char path[64];
 376     char status[5];
 377     char needle[sizeof wificard + 1];
 378     FILE *fp;
 379
 380     /* generate the path name */
 381     memset(path, 0, sizeof path);
 382     strcat(path, "/sys/class/net/");
 383     strcat(path, wificard);
 384     strcat(path, "/operstate");
 385
 386     /* open wifi file */
 387     if(!(fp = fopen(path, "r"))) {
 388         fprintf(stderr, "Error opening wifi operstate file.");
 389         return smprintf("n/a");
 390     }
 391
 392     /* read the status */
 393     fgets(status, 5, fp);
 394
 395     /* close wifi file */
 396     fclose(fp);
 397
 398     /* check if interface down */
 399     if(strcmp(status, "up\n") != 0){
 400         return smprintf("n/a");
 401     }
 402
 403     /* open wifi file */
 404     if (!(fp = fopen("/proc/net/wireless", "r"))) {
 405         fprintf(stderr, "Error opening wireless file.");
 406         return smprintf("n/a");
 407     }
 408
 409     /* extract the signal strength */
 410     strcpy(needle, wificard);
 411     strcat(needle, ":");
 412     fgets(buf, bufsize, fp);
 413     fgets(buf, bufsize, fp);
 414     fgets(buf, bufsize, fp);
 415     if ((datastart = strstr(buf, needle)) != NULL) {
 416         datastart = strstr(buf, ":");
 417         sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
 418     }
 419
 420     /* close wifi file */
 421     fclose(fp);
 422
 423     /* return strength in percent */
 424     return smprintf("%d%%", strength);
 425 }
 426
 427 /* main function */
 428 int
 429 main()
 430 {
 431     char status_string[1024];
 432     struct arg argument;
 433
 434     /* try to open display */
 435     if (!(dpy = XOpenDisplay(0x0))) {
 436         fprintf(stderr, "Cannot open display!\n");
 437         exit(1);
 438     }
 439
 440     /* return status every interval */
 441     for (;;) {
 442         /* clear the string */
 443         memset(status_string, 0, sizeof(status_string));
 444
 445         /* generate status_string */
 446         for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 447             argument = args[i];
 448             char *res = argument.func(argument.args);
 449             char *element = smprintf(argument.format, res);
 450             strcat(status_string, element);
 451             free(res);
 452             free(element);
 453         }
 454
 455         /* return the statusbar */
 456         setstatus(status_string);
 457
 458         /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 459         sleep(update_interval -1);
 460     }
 461
 462     /* close display */
 463     XCloseDisplay(dpy);
 464
 465     /* exit successfully */
 466     return 0;
 467 }