slstatus.c

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