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 /* ram percentage */
 185 char *
 186 ram_perc(const char *null)
 187 {
 188     int perc;
 189     long total, free, buffers, cached;
 190     FILE *fp;
 191
 192     /* open meminfo file */
 193     if (!(fp = fopen("/proc/meminfo", "r"))) {
 194         fprintf(stderr, "Error opening meminfo file.");
 195         return smprintf("n/a");
 196     }
 197
 198     /* read the values */
 199     fscanf(fp, "MemTotal: %ld kB\n", &total);
 200     fscanf(fp, "MemFree: %ld kB\n", &free);
 201     fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
 202     fscanf(fp, "Cached: %ld kB\n", &cached);
 203
 204     /* close meminfo file */
 205     fclose(fp);
 206
 207     /* calculate percentage */
 208     perc = 100 * ((total - free) - (buffers + cached)) / total;
 209
 210     /* return perc as string */
 211     return smprintf("%d%%", perc);
 212 }
 213
 214 /* temperature */
 215 char *
 216 temp(const char *file)
 217 {
 218     int temperature;
 219     FILE *fp;
 220
 221     /* open temperature file */
 222     if (!(fp = fopen(file, "r"))) {
 223         fprintf(stderr, "Could not open temperature file.\n");
 224         return smprintf("n/a");
 225     }
 226
 227     /* extract temperature */
 228     fscanf(fp, "%d", &temperature);
 229
 230     /* close temperature file */
 231     fclose(fp);
 232
 233     /* return temperature in degrees */
 234     return smprintf("%d°C", temperature / 1000);
 235 }
 236
 237
 238 /* alsa volume percentage */
 239 char *
 240 vol_perc(const char *soundcard)
 241 {
 242     int mute = 0;
 243     long vol = 0, max = 0, min = 0;
 244
 245     /* get volume from alsa */
 246     snd_mixer_t *handle;
 247     snd_mixer_elem_t *pcm_mixer, *mas_mixer;
 248     snd_mixer_selem_id_t *vol_info, *mute_info;
 249     snd_mixer_open(&handle, 0);
 250     snd_mixer_attach(handle, soundcard);
 251     snd_mixer_selem_register(handle, NULL, NULL);
 252     snd_mixer_load(handle);
 253     snd_mixer_selem_id_malloc(&vol_info);
 254     snd_mixer_selem_id_malloc(&mute_info);
 255     snd_mixer_selem_id_set_name(vol_info, channel);
 256     snd_mixer_selem_id_set_name(mute_info, channel);
 257     pcm_mixer = snd_mixer_find_selem(handle, vol_info);
 258     mas_mixer = snd_mixer_find_selem(handle, mute_info);
 259     snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
 260     snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
 261     snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
 262     if (vol_info)
 263         snd_mixer_selem_id_free(vol_info);
 264     if (mute_info)
 265         snd_mixer_selem_id_free(mute_info);
 266     if (handle)
 267         snd_mixer_close(handle);
 268
 269     /* return the string (mute) */
 270     if (!mute)
 271         return smprintf("mute");
 272     else
 273         return smprintf("%d%%", (vol * 100) / max);
 274 }
 275
 276 /* wifi percentage */
 277 char *
 278 wifi_perc(const char *wificard)
 279 {
 280     int bufsize = 255;
 281     int strength;
 282     char buf[bufsize];
 283     char *datastart;
 284     char path[64];
 285     char status[5];
 286     char needle[sizeof wificard + 1];
 287     FILE *fp;
 288
 289     /* generate the path name */
 290     memset(path, 0, sizeof path);
 291     strcat(path, "/sys/class/net/");
 292     strcat(path, wificard);
 293     strcat(path, "/operstate");
 294
 295     /* open wifi file */
 296     if(!(fp = fopen(path, "r"))) {
 297         fprintf(stderr, "Error opening wifi operstate file.");
 298         return smprintf("n/a");
 299     }
 300
 301     /* read the status */
 302     fgets(status, 5, fp);
 303
 304     /* close wifi file */
 305     fclose(fp);
 306
 307     /* check if interface down */
 308     if(strcmp(status, "up\n") != 0){
 309         return smprintf("n/a");
 310     }
 311
 312     /* open wifi file */
 313     if (!(fp = fopen("/proc/net/wireless", "r"))) {
 314         fprintf(stderr, "Error opening wireless file.");
 315         return smprintf("n/a");
 316     }
 317
 318     /* extract the signal strength */
 319     strcpy(needle, wificard);
 320     strcat(needle, ":");
 321     fgets(buf, bufsize, fp);
 322     fgets(buf, bufsize, fp);
 323     fgets(buf, bufsize, fp);
 324     if ((datastart = strstr(buf, needle)) != NULL) {
 325         datastart = strstr(buf, ":");
 326         sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
 327     }
 328
 329     /* close wifi file */
 330     fclose(fp);
 331
 332     /* return strength in percent */
 333     return smprintf("%d%%", strength);
 334 }
 335
 336 /* main function */
 337 int
 338 main()
 339 {
 340     char status_string[1024];
 341     struct arg argument;
 342
 343     /* try to open display */
 344     if (!(dpy = XOpenDisplay(0x0))) {
 345         fprintf(stderr, "Cannot open display!\n");
 346         exit(1);
 347     }
 348
 349     /* return status every interval */
 350     for (;;) {
 351         /* clear the string */
 352         memset(status_string, 0, sizeof(status_string));
 353
 354         /* generate status_string */
 355         for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
 356             argument = args[i];
 357             char *res = argument.func(argument.args);
 358             char *element = smprintf(argument.format, res);
 359             strcat(status_string, element);
 360             free(res);
 361             free(element);
 362         }
 363
 364         /* return the statusbar */
 365         setstatus(status_string);
 366
 367         /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
 368         sleep(update_interval -1);
 369     }
 370
 371     /* close display */
 372     XCloseDisplay(dpy);
 373
 374     /* exit successfully */
 375     return 0;
 376 }