cprogs/xacpi-simple.c

   1 /*
   2  * display outputs, per line:
   3  *
   4  *   Remaining: | Empty:        | Degraded:
   5  *     blue     |  black        |  dimgrey      discharging
   6  *     green    |  black        |  dimgrey      charging
   7  *     cyan     |  black        |  dimgrey      charged
   8  *     grey     |  black        |  dimgrey      charging&discharching!
   9  *     blue     |  red          |  dimgrey      discharging - low!
  10  *     green    |  red          |  dimgrey      charging - low
  11  *     cyan     |  red          |  dimgrey      charged - low [1]
  12  *     grey     |  red          |  dimgrey      charging&discharching, low [1]
  13  *       ...  darkgreen  ...                    no batteries present
  14  *
  15  * [1] battery must be quite badly degraded
  16  */
  17
  18 #include <stdio.h>
  19 #include <assert.h>
  20 #include <math.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <unistd.h>
  25 #include <ctype.h>
  26
  27 #include <sys/poll.h>
  28 #include <sys/types.h>
  29 #include <dirent.h>
  30
  31 #include <X11/Xlib.h>
  32
  33 #define TOP      60
  34 #define BOTTOM 3600
  35
  36 #define TIMEOUT 5000 /* milliseconds */
  37
  38 /*---------- general utility stuff and declarations ----------*/
  39
  40 static void fail(const char *m) {
  41   fprintf(stderr,"error: %s\n", m);
  42   exit(-1);
  43 }
  44 static void badusage(void) { fail("bad usage"); }
  45
  46 #define CHGST_DISCHARGING 0 /* Reflects order in E(state,charging_state)  */
  47 #define CHGST_CHARGING    1 /*  in fields table.  Also, much code assumes */
  48 #define CHGST_CHARGED     2 /*  exactly these three possible states.      */
  49
  50 /*---------- structure of and results from /proc/acpi/battery/... ----------*/
  51 /* variables thisbat_... are the results from readbattery();
  52  * if readbattery() succeeds they are all valid and not VAL_NOTFOUND
  53  */
  54
  55 typedef struct batinfo_field {
  56   const char *file;
  57   const char *label;
  58   unsigned long *valuep;
  59   const char *unit;
  60   const char *enumarray[10];
  61 } batinfo_field;
  62
  63 #define QUANTITY_FIELDS                         \
  64   QF(info,  design_capacity,    "mWh")          \
  65   QF(info,  last_full_capacity, "mWh")          \
  66   QF(state, present_rate,       "mW")           \
  67   QF(state, remaining_capacity, "mWh")          \
  68   QF(alarm, alarm,              "mWh")
  69
  70 #define QF(f,l,u) static unsigned long thisbat_##f##_##l;
  71   QUANTITY_FIELDS
  72 #undef QF
  73
  74 static unsigned long thisbat_alarm_present, thisbat_info_present;
  75 static unsigned long thisbat_state_present, thisbat_state_charging_state;
  76
  77 #define VAL_NOTFOUND (~0UL)
  78
  79 static const batinfo_field fields[]= {
  80 #define E(f,l)       #f, #l, &thisbat_##f##_##l, 0
  81 #define QF(f,l,u)  { #f, #l, &thisbat_##f##_##l, u },
  82   { E(alarm, present),           { "no", "yes" }                          },
  83   { E(info, present),            { "no", "yes" }                          },
  84   { E(state,present),            { "no", "yes" }                          },
  85   { E(state,charging_state),     { "discharging", "charging", "charged" } },
  86   QUANTITY_FIELDS           /* take care re charging_state values order -  */
  87   { 0 }                     /* if you must change it, search for CHGST_... */
  88 #undef E
  89 #undef QF
  90 };
  91
  92 static const char *files[]= { "info", "state", "alarm" };
  93
  94 /*---------- parsing of one battery in /proc/acpi/battery/... ----------*/
  95
  96 /* variables private to the parser and its error handlers */
  97 static char batlinebuf[1000];
  98 static FILE *batfile;
  99 static const char *batdirname;
 100 static const char *batfilename;
 101 static const char *batlinevalue;
 102
 103 static int batfailf(const char *why) {
 104   if (batlinevalue) {
 105     fprintf(stderr,"battery/%s/%s: %s value `%s': %s\n",
 106             batdirname,batfilename, batlinebuf,batlinevalue,why);
 107   } else {
 108     fprintf(stderr,"battery/%s/%s: %s: `%s'\n",
 109             batdirname,batfilename, why, batlinebuf);
 110   }
 111   return -1;
 112 }
 113
 114 static int batfaile(const char *syscall, const char *target) {
 115   fprintf(stderr,"battery/%s: failed to %s %s: %s\n",
 116           batdirname ? batdirname : "*", syscall, target, strerror(errno));
 117   return -1;
 118 }
 119
 120 static void chdir_base(void) {
 121   int r;
 122
 123   r= chdir("/proc/acpi/battery");
 124   if (r) batfaile("chdir","/proc/acpi/battery");
 125 }
 126
 127 static void tidybattery(void) {
 128   if (batfile) { fclose(batfile); batfile=0; }
 129   if (batdirname) { chdir_base(); batdirname=0; }
 130 }
 131
 132 static int readbattery(void) { /* 0=>ok, -1=>couldn't */
 133   const batinfo_field *field;
 134   const char *const *cfilename, *const *enumsearch;
 135   char *colon, *ep, *sr, *p;
 136   int r, l, missing;
 137
 138   r= chdir(batdirname);
 139   if (r) return batfaile("chdir",batdirname);
 140
 141   for (field=fields; field->file; field++)
 142     *field->valuep= VAL_NOTFOUND;
 143
 144   for (cfilename=files;
 145        (batfilename= *cfilename);
 146        cfilename++) {
 147     batfile= fopen(batfilename,"r");
 148     if (!batfile) return batfaile("open",batfilename);
 149
 150     for (;;) {
 151       batlinevalue= 0;
 152
 153       sr= fgets(batlinebuf,sizeof(batlinebuf),batfile);
 154       if (ferror(batfile)) return batfaile("read",batfilename);
 155       if (!sr && feof(batfile)) break;
 156       l= strlen(batlinebuf);
 157       assert(l>0);
 158       if (batlinebuf[l-1] != '\n')
 159         return batfailf("line too long");
 160       batlinebuf[l-1]= 0;
 161       colon= strchr(batlinebuf,':');
 162       if (!colon)
 163         return batfailf("line without a colon");
 164       *colon= 0;
 165
 166       for (p=batlinebuf; p<colon; p++)
 167         if (*p == ' ')
 168           *p= '_';
 169
 170       for (field=fields; field->file; field++) {
 171         if (!strcmp(field->file,batfilename) &&
 172             !strcmp(field->label,batlinebuf))
 173           goto label_interesting;
 174       }
 175       continue;
 176
 177     label_interesting:
 178       for (batlinevalue= colon+1;
 179            *batlinevalue && isspace((unsigned char)*batlinevalue);
 180            batlinevalue++);
 181
 182       if (field->unit) {
 183
 184         *field->valuep= strtoul(batlinevalue,&ep,10);
 185         if (ep==batlinevalue || *ep!=' ')
 186           batfailf("value number syntax incorrect");
 187         if (strcmp(ep+1,field->unit)) batfailf("incorrect unit");
 188
 189       } else {
 190
 191         for (*field->valuep=0, enumsearch=field->enumarray;
 192              *enumsearch && strcmp(*enumsearch,batlinevalue);
 193              (*field->valuep)++, enumsearch++);
 194         if (!*enumsearch)
 195           batfailf("unknown enum value");
 196
 197       }
 198     }
 199
 200     fclose(batfile);
 201     batfile= 0;
 202   }
 203
 204   r= chdir("..");
 205   if (r) return batfaile("chdir","..");
 206   batdirname= 0;
 207
 208   if (!(thisbat_alarm_present==0 ||
 209         thisbat_info_present==0 ||
 210         thisbat_state_present==0)) {
 211     if (thisbat_alarm_present == VAL_NOTFOUND)
 212       thisbat_alarm_present= 1;
 213
 214     for (field=fields, missing=0;
 215          field->file;
 216          field++) {
 217       if (*field->valuep == VAL_NOTFOUND) {
 218         fprintf(stderr,"battery/%s/%s: %s: not found\n",
 219                 batdirname, field->file,field->label);
 220         missing++;
 221       }
 222     }
 223     if (missing) return -1;
 224   }
 225
 226   return 0;
 227 }
 228
 229 /*---------- data collection and analysis ----------*/
 230
 231 /* These next three variables are the results of the charging state */
 232 static unsigned charging_state_mask; /* 1u<<CHGST_* | ... */
 233 static double nondegraded_norm, fill_norm, ratepersec_norm;
 234 static int alarm_level; /* 0=ok, 1=low */
 235
 236 #define QF(f,l,u) \
 237   static double total_##f##_##l;
 238   QUANTITY_FIELDS
 239 #undef QF
 240
 241 static void acquiredata(void) {
 242   DIR *di;
 243   struct dirent *de;
 244   int r;
 245
 246   charging_state_mask= 0;
 247
 248 #define QF(f,l,u) \
 249   total_##f##_##l= 0;
 250   QUANTITY_FIELDS
 251 #undef QF
 252
 253   di= opendir(".");  if (!di) batfaile("opendir","battery");
 254   while ((de= readdir(di))) {
 255     if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
 256
 257     batdirname= de->d_name;
 258     r= readbattery();
 259     tidybattery();
 260
 261     if (r) continue;
 262
 263     if (!thisbat_info_present || !thisbat_state_present)
 264       continue;
 265
 266     charging_state_mask |= 1u << thisbat_state_charging_state;
 267
 268 #define QF(f,l,u) \
 269     total_##f##_##l += thisbat_##f##_##l;
 270     QUANTITY_FIELDS
 271 #undef QF
 272
 273     if (thisbat_state_charging_state == CHGST_DISCHARGING)
 274       /* negate it */
 275       total_state_present_rate -= 2.0 * thisbat_state_present_rate;
 276
 277   }
 278   closedir(di);
 279
 280   if (total_info_design_capacity < 0.5)
 281     total_info_design_capacity= 1.0;
 282
 283   if (total_info_last_full_capacity < total_state_remaining_capacity)
 284     total_info_last_full_capacity= total_state_remaining_capacity;
 285   if (total_info_design_capacity < total_info_last_full_capacity)
 286     total_info_design_capacity= total_info_last_full_capacity;
 287
 288   alarm_level=
 289     (total_state_remaining_capacity < total_alarm_alarm &&
 290      !(charging_state_mask & 1u << CHGST_CHARGING));
 291
 292   nondegraded_norm= total_info_last_full_capacity / total_info_design_capacity;
 293   fill_norm= total_state_remaining_capacity / total_info_design_capacity;
 294   ratepersec_norm=  total_state_present_rate
 295     / (3600.0 * total_info_design_capacity);
 296 }
 297
 298 static void initacquire(void) {
 299   chdir_base();
 300 }
 301
 302 /*---------- display ----------*/
 303
 304 #define COLOURS                                 \
 305   C(dimgrey)                                    \
 306   C(blue)                                       \
 307   C(black)                                      \
 308   C(red)                                        \
 309   C(green)                                      \
 310   C(cyan)                                       \
 311   C(grey)                                       \
 312   C(darkgreen)                                  \
 313   C(white)                                      \
 314   GC(remain)                                    \
 315   GC(white)                                     \
 316   GC(empty)
 317
 318 static Display *disp;
 319 static Window win;
 320 static int width, height;
 321 static Colormap cmap;
 322 static int screen;
 323 static unsigned long lastbackground;
 324
 325 typedef struct {
 326   GC gc;
 327   unsigned long lastfg;
 328 } Gcstate;
 329
 330 #define C(c) static unsigned long pix_##c;
 331 #define GC(g) static Gcstate gc_##g;
 332   COLOURS
 333 #undef C
 334 #undef GC
 335
 336 static void refresh(void);
 337
 338 #define CHGMASK_CHG_DIS (1u<<CHGST_CHARGING | 1u<<CHGST_DISCHARGING)
 339
 340 static void failr(const char *m, int r) {
 341   fprintf(stderr,"error: %s (code %d)\n", m, r);
 342   exit(-1);
 343 }
 344
 345 static void setbackground(unsigned long newbg) {
 346   int r;
 347
 348   if (newbg == lastbackground) return;
 349   r= XSetWindowBackground(disp,win,newbg);
 350   if (!r) fail("XSetWindowBackground");
 351   lastbackground= newbg;
 352 }
 353
 354 static void setforeground(Gcstate *g, unsigned long px) {
 355   XGCValues gcv;
 356   int r;
 357
 358   if (g->lastfg == px) return;
 359
 360   memset(&gcv,0,sizeof(gcv));
 361   g->lastfg= gcv.foreground= px;
 362   r= XChangeGC(disp,g->gc,GCForeground,&gcv);
 363   if (!r) fail("XChangeGC");
 364 }
 365
 366 static void show(void) {
 367   double elap, then;
 368   int i, leftmost_lit, leftmost_nondeg, beyond, first_beyond;
 369
 370   if (!charging_state_mask) {
 371     setbackground(pix_darkgreen);
 372     XClearWindow(disp,win);
 373     return;
 374   }
 375
 376   setbackground(pix_dimgrey);
 377   XClearWindow(disp,win);
 378
 379   setforeground(&gc_remain,
 380                 !(charging_state_mask & CHGMASK_CHG_DIS) ? pix_cyan :
 381                 !(~charging_state_mask & CHGMASK_CHG_DIS) ? pix_grey :
 382                 charging_state_mask & (1u<<CHGST_CHARGING)
 383                 ? pix_green : pix_blue);
 384
 385   setforeground(&gc_empty, alarm_level ? pix_red : pix_black);
 386
 387   for (i=0, first_beyond=1; i<height; i++) {
 388     elap= !i ? 0 :
 389       height==2 ? BOTTOM :
 390       TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
 391
 392     then= fill_norm + ratepersec_norm * elap;
 393
 394     beyond=
 395       ((charging_state_mask & (1u<<CHGST_DISCHARGING) && then <= 0.0) ||
 396        (charging_state_mask & (1u<<CHGST_CHARGING) && then>=nondegraded_norm));
 397
 398     if (then <= 0.0) then= 0.0;
 399     else if (then >= nondegraded_norm) then= nondegraded_norm;
 400
 401     leftmost_lit= width * then;
 402     leftmost_nondeg= width * nondegraded_norm;
 403
 404     if (beyond && first_beyond) {
 405       XDrawLine(disp, win, gc_white.gc, 0,i, leftmost_nondeg,i);
 406       first_beyond= 0;
 407     } else {
 408       if (leftmost_lit < leftmost_nondeg)
 409         XDrawLine(disp, win, gc_empty.gc,
 410                   leftmost_lit,i, leftmost_nondeg,i);
 411       if (leftmost_lit >= 0)
 412         XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
 413     }
 414   }
 415 }
 416
 417 static void initgc(Gcstate *gc_r) {
 418   XGCValues gcv;
 419
 420   memset(&gcv,0,sizeof(gcv));
 421   gcv.function= GXcopy;
 422   gcv.line_width= 1;
 423   gc_r->lastfg= gcv.foreground= pix_white;
 424   gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
 425 }
 426
 427 static void colour(unsigned long *pix_r, const char *name) {
 428   XColor xc;
 429   Status st;
 430
 431   st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
 432   if (!st) fail(name);
 433
 434   *pix_r= xc.pixel;
 435 }
 436
 437 static void initgraphics(void) {
 438   int r;
 439
 440   disp= XOpenDisplay(0); if (!disp) fail("could not open display");
 441
 442   screen= DefaultScreen(disp);
 443   win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),0,0,100,20,0,0,0);
 444   cmap= DefaultColormap(disp,screen);
 445
 446 #define C(c) colour(&pix_##c, #c);
 447 #define GC(g) initgc(&gc_##g);
 448   COLOURS
 449 #undef C
 450 #undef GC
 451
 452   r= XSetWindowBackground(disp,win,pix_dimgrey);
 453   if (!r) fail("init set background");
 454   lastbackground= pix_dimgrey;
 455
 456   XSetWMName(disp,win,"xacpi-simple");
 457
 458   XSelectInput(disp,win, ExposureMask|StructureNotifyMask);
 459   XMapWindow(disp,win);
 460 }
 461
 462 static void refresh(void) {
 463   acquiredata();
 464   show();
 465 }
 466
 467 static void newgeometry(void) {
 468   int dummy;
 469   Window dummyw;
 470
 471   XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
 472 }
 473
 474 static void eventloop(void) {
 475   XEvent ev;
 476   struct pollfd pfd;
 477   int r;
 478
 479   newgeometry();
 480   refresh();
 481
 482   for (;;) {
 483     XFlush(disp);
 484
 485     pfd.fd= ConnectionNumber(disp);
 486     pfd.events= POLLIN|POLLERR;
 487
 488     r= poll(&pfd,1,TIMEOUT);
 489     if (r==-1 && errno!=EINTR) failr("poll",errno);
 490
 491     while (XPending(disp)) {
 492       XNextEvent(disp,&ev);
 493       if (ev.type == ConfigureNotify) {
 494         XConfigureEvent *ce= (void*)&ev;
 495         width= ce->width;
 496         height= ce->height;
 497       }
 498     }
 499     refresh();
 500   }
 501 }
 502
 503 int main(int argc, const char *const *argv) {
 504   if (!argv[0] || argv[1])
 505     badusage();
 506
 507   initacquire();
 508   initgraphics();
 509   eventloop();
 510   return 0;
 511 }