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 get_battery(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 temperature */
  99 char *
 100 get_cpu_temperature(const char *file)
 101 {
 102     int temperature;
 103     FILE *fp;
 104
 105     /* open temperature file */
 106     if (!(fp = fopen(file, "r"))) {
 107         fprintf(stderr, "Could not open temperature file.\n");
 108         return smprintf("n/a");
 109     }
 110
 111     /* extract temperature */
 112     fscanf(fp, "%d", &temperature);
 113
 114     /* close temperature file */
 115     fclose(fp);
 116
 117     /* return temperature in degrees */
 118     return smprintf("%d°C", temperature / 1000);
 119 }
 120
 121 /* cpu percentage */
 122 char *
 123 get_cpu_usage(const char *null)
 124 {
 125     int perc;
 126     long double a[4], b[4];
 127     FILE *fp;
 128
 129     /* open stat file */
 130     if (!(fp = fopen("/proc/stat","r"))) {
 131         fprintf(stderr, "Error opening stat file.");
 132         return smprintf("n/a");
 133     }
 134
 135     /* read values */
 136     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 137
 138     /* close stat file */
 139     fclose(fp);
 140
 141     /* wait a second (for avg values) */
 142     sleep(1);
 143
 144     /* open stat file */
 145     if (!(fp = fopen("/proc/stat","r"))) {
 146         fprintf(stderr, "Error opening stat file.");
 147         return smprintf("n/a");
 148     }
 149
 150     /* read values */
 151     fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
 152
 153     /* close stat file */
 154     fclose(fp);
 155
 156     /* calculate avg in this second */
 157     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]));
 158
 159     /* return perc as string */
 160     return smprintf("%d%%", perc);
 161 }
 162
 163 /* date and time */
 164 char *
 165 get_datetime(const char *timeformat)
 166 {
 167     time_t tm;
 168     size_t bufsize = 64;
 169     char *buf = malloc(bufsize);
 170
 171     /* get time in format */
 172     time(&tm);
 173     setlocale(LC_TIME, "");
 174     if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
 175         setlocale(LC_TIME, "C");
 176         fprintf(stderr, "Strftime failed.\n");
 177         return smprintf("n/a");
 178     }
 179
 180     setlocale(LC_TIME, "C");
 181     /* return time */
 182     char *ret = smprintf("%s", buf);
 183     free(buf);
 184     return ret;
 185 }
 186
 187 /* disk usage percentage */
 188 char *
 189 get_diskusage(const char *mountpoint)
 190 {
 191     int perc = 0;
 192     struct statvfs fs;
 193
 194     /* try to open mountpoint */
 195     if (statvfs(mountpoint, &fs) < 0) {
 196         fprintf(stderr, "Could not get filesystem info.\n");
 197         return smprintf("n/a");
 198     }
 199
 200     /* calculate percent */
 201     perc = 100 * (1.0f - ((float)fs.f_bavail / (float)fs.f_blocks));
 202
 203     /* return perc */
 204     return smprintf("%d%%", perc);
 205 }
 206
 207 /* ram percentage */
 208 char *
 209 get_ram_usage(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 /* alsa volume percentage */
 238 char *
 239 get_volume(const char *soundcard)
 240 {
 241     int mute = 0;
 242     long vol = 0, max = 0, min = 0;
 243
 244     /* get volume from alsa */
 245     snd_mixer_t *handle;
 246     snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 247     snd_mixer_selem_id_t *vol_info, *mute_info;
 248     snd_mixer_open(&handle, 0);
 249     snd_mixer_attach(handle, soundcard);
 250     snd_mixer_selem_register(handle, NULL, NULL);
 251     snd_mixer_load(handle);
 252     snd_mixer_selem_id_malloc(&vol_info);
 253     snd_mixer_selem_id_malloc(&mute_info);
 254     snd_mixer_selem_id_set_name(vol_info, channel);
 255     snd_mixer_selem_id_set_name(mute_info, channel);
 256     pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 257     mas_mixer = snd_mixer_find_selem(handle, mute_info);
 258     snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 259     snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 260     snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 261     if (vol_info)
 262         snd_mixer_selem_id_free(vol_info);
 263     if (mute_info)
 264         snd_mixer_selem_id_free(mute_info);
 265     if (handle)
 266         snd_mixer_close(handle);
 267
 268     /* return the string (mute) */
 269     if (!mute)
 270         return smprintf("mute");
 271     else
 272         return smprintf("%d%%", (vol * 100) / max);
 273 }
 274
 275 /* wifi percentage */
 276 char *
 277 get_wifi_signal(const char *wificard)
 278 {
 279     int bufsize = 255;
 280     int strength;
 281     char buf[bufsize];
 282     char *datastart;
 283     char path[64];
 284     char status[5];
 285     char needle[sizeof wificard + 1];
 286     FILE *fp;
 287
 288     /* generate the path name */
 289     memset(path, 0, sizeof path);
 290     strcat(path, "/sys/class/net/");
 291     strcat(path, wificard);
 292     strcat(path, "/operstate");
 293
 294     /* open wifi file */
 295     if(!(fp = fopen(path, "r"))) {
 296         fprintf(stderr, "Error opening wifi operstate file.");
 297         return smprintf("n/a");
 298     }
 299
 300     /* read the status */
 301     fgets(status, 5, fp);
 302
 303     /* close wifi file */
 304     fclose(fp);
 305
 306     /* check if interface down */
 307     if(strcmp(status, "up\n") != 0){
 308         return smprintf("n/a");
 309     }
 310
 311     /* open wifi file */
 312     if (!(fp = fopen("/proc/net/wireless", "r"))) {
 313         fprintf(stderr, "Error opening wireless file.");
 314         return smprintf("n/a");
 315     }
 316
 317     /* extract the signal strength */
 318     strcpy(needle, wificard);
 319     strcat(needle, ":");
 320     fgets(buf, bufsize, fp);
 321     fgets(buf, bufsize, fp);
 322     fgets(buf, bufsize, fp);
 323     if ((datastart = strstr(buf, needle)) != NULL) {
 324         datastart = strstr(buf, ":");
 325         sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
 326     }
 327
 328     /* close wifi file */
 329     fclose(fp);
 330
 331     /* return strength in percent */
 332     return smprintf("%d%%", strength);
 333 }
 334
 335 /* main function */
 336 int
 337 main()
 338 {
 339     char status_string[1024];
 340     struct arg argument;
 341
 342     /* try to open display */
 343     if (!(dpy = XOpenDisplay(0x0))) {
 344         fprintf(stderr, "Cannot open display!\n");
 345         exit(1);
 346     }
 347
 348     /* return status every interval */
 349     for (;;) {
 350         /* clear the string */
 351         memset(status_string, 0, sizeof(status_string));
 352
 353         /* generate status_string */
 354         for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 355             argument = args[i];
 356             char *res = argument.func(argument.args);
 357             char *element = smprintf(argument.format, res);
 358             strcat(status_string, element);
 359             free(res);
 360             free(element);
 361         }
 362
 363         /* return the statusbar */
 364         setstatus(status_string);
 365
 366         /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 367         sleep(update_interval -1);
 368     }
 369
 370     /* close display */
 371     XCloseDisplay(dpy);
 372
 373     /* exit successfully */
 374     return 0;
 375 }