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