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  *       ...  yellow  ...                       error
  15  *
  16  * [1] battery must be quite badly degraded
  17  */
  18
  19 #include <stdio.h>
  20 #include <assert.h>
  21 #include <math.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <ctype.h>
  27
  28 #include <sys/poll.h>
  29 #include <sys/types.h>
  30 #include <dirent.h>
  31
  32 #include <X11/Xlib.h>
  33 #include <X11/Xutil.h>
  34 #include <X11/Xresource.h>
  35
  36 #define TOP      60
  37 #define BOTTOM 3600
  38
  39 #define TIMEOUT         5000 /* milliseconds */
  40 #define TIMEOUT_ONERROR 3333 /* milliseconds */
  41
  42 static const char program_name[]= "xacpi-simple";
  43
  44 /*---------- general utility stuff and declarations ----------*/
  45
  46 static void fail(const char *m) {
  47   fprintf(stderr,"error: %s\n", m);
  48   exit(-1);
  49 }
  50 static void badusage(void) { fail("bad usage"); }
  51
  52 #define CHGST_DISCHARGING 0 /* Reflects order in E(state,charging_state)  */
  53 #define CHGST_CHARGING    1 /*  in fields table.  Also, much code assumes */
  54 #define CHGST_CHARGED     2 /*  exactly these three possible states.      */
  55 #define CHGST_ERROR       8 /* Except that this one is an extra bit.      */
  56
  57 /*---------- structure of and results from /proc/acpi/battery/... ----------*/
  58 /* variables thisbat_... are the results from readbattery();
  59  * if readbattery() succeeds they are all valid and not VAL_NOTFOUND
  60  */
  61
  62 typedef struct batinfo_field {
  63   const char *file;
  64   const char *label;
  65   unsigned long *valuep;
  66   const char *unit;
  67   const char *enumarray[10];
  68 } batinfo_field;
  69
  70 #define QUANTITY_FIELDS                         \
  71   QF(info,  design_capacity,    "mWh")          \
  72   QF(info,  last_full_capacity, "mWh")          \
  73   QF(state, present_rate,       "mW")           \
  74   QF(state, remaining_capacity, "mWh")          \
  75   QF(alarm, alarm,              "mWh")
  76
  77 #define QF(f,l,u) static unsigned long thisbat_##f##_##l;
  78   QUANTITY_FIELDS
  79 #undef QF
  80
  81 static unsigned long thisbat_alarm_present, thisbat_info_present;
  82 static unsigned long thisbat_state_present, thisbat_state_charging_state;
  83
  84 #define VAL_NOTFOUND (~0UL)
  85
  86 static const batinfo_field fields[]= {
  87 #define E(f,l)       #f, #l, &thisbat_##f##_##l, 0
  88 #define QF(f,l,u)  { #f, #l, &thisbat_##f##_##l, u },
  89   { E(alarm, present),           { "no", "yes" }                          },
  90   { E(info, present),            { "no", "yes" }                          },
  91   { E(state,present),            { "no", "yes" }                          },
  92   { E(state,charging_state),     { "discharging", "charging", "charged" } },
  93   QUANTITY_FIELDS           /* take care re charging_state values order -  */
  94   { 0 }                     /* if you must change it, search for CHGST_... */
  95 #undef E
  96 #undef QF
  97 };
  98
  99 static const char *files[]= { "info", "state", "alarm" };
 100
 101 /*---------- parsing of one battery in /proc/acpi/battery/... ----------*/
 102
 103 /* variables private to the parser and its error handlers */
 104 static char batlinebuf[1000];
 105 static FILE *batfile;
 106 static const char *batdirname;
 107 static const char *batfilename;
 108 static const char *batlinevalue;
 109
 110 static int batfailf(const char *why) {
 111   if (batlinevalue) {
 112     fprintf(stderr,"battery/%s/%s: %s value `%s': %s\n",
 113             batdirname,batfilename, batlinebuf,batlinevalue,why);
 114   } else {
 115     fprintf(stderr,"battery/%s/%s: %s: `%s'\n",
 116             batdirname,batfilename, why, batlinebuf);
 117   }
 118   return -1;
 119 }
 120
 121 static int batfaile(const char *syscall, const char *target) {
 122   fprintf(stderr,"battery/%s: failed to %s %s: %s\n",
 123           batdirname ? batdirname : "*", syscall, target, strerror(errno));
 124   return -1;
 125 }
 126
 127 static void chdir_base(void) {
 128   int r;
 129
 130   r= chdir("/proc/acpi/battery");
 131   if (r) batfaile("chdir","/proc/acpi/battery");
 132 }
 133
 134 static void tidybattery(void) {
 135   if (batfile) { fclose(batfile); batfile=0; }
 136   if (batdirname) { chdir_base(); batdirname=0; }
 137 }
 138
 139 static int readbattery(void) { /* 0=>ok, -1=>couldn't */
 140   const batinfo_field *field;
 141   const char *const *cfilename, *const *enumsearch;
 142   char *colon, *ep, *sr, *p;
 143   int r, l, missing;
 144
 145   r= chdir(batdirname);
 146   if (r) return batfaile("chdir",batdirname);
 147
 148   for (field=fields; field->file; field++)
 149     *field->valuep= VAL_NOTFOUND;
 150
 151   for (cfilename=files;
 152        (batfilename= *cfilename);
 153        cfilename++) {
 154     batfile= fopen(batfilename,"r");
 155     if (!batfile) return batfaile("open",batfilename);
 156
 157     for (;;) {
 158       batlinevalue= 0;
 159
 160       sr= fgets(batlinebuf,sizeof(batlinebuf),batfile);
 161       if (ferror(batfile)) return batfaile("read",batfilename);
 162       if (!sr && feof(batfile)) break;
 163       l= strlen(batlinebuf);
 164       assert(l>0);
 165       if (batlinebuf[l-1] != '\n')
 166         return batfailf("line too long");
 167       batlinebuf[l-1]= 0;
 168       colon= strchr(batlinebuf,':');
 169       if (!colon)
 170         return batfailf("line without a colon");
 171       *colon= 0;
 172
 173       for (batlinevalue= colon+1;
 174            *batlinevalue && isspace((unsigned char)*batlinevalue);
 175            batlinevalue++);
 176
 177       if (!strcmp(batlinebuf,"ERROR"))
 178         return batfailf("kernel reports error");
 179
 180       for (p=batlinebuf; p<colon; p++)
 181         if (*p == ' ')
 182           *p= '_';
 183
 184       for (field=fields; field->file; field++) {
 185         if (!strcmp(field->file,batfilename) &&
 186             !strcmp(field->label,batlinebuf))
 187           goto label_interesting;
 188       }
 189       continue;
 190
 191     label_interesting:
 192       if (field->unit) {
 193
 194         *field->valuep= strtoul(batlinevalue,&ep,10);
 195         if (ep==batlinevalue || *ep!=' ')
 196           batfailf("value number syntax incorrect");
 197         if (strcmp(ep+1,field->unit)) batfailf("incorrect unit");
 198
 199       } else {
 200
 201         for (*field->valuep=0, enumsearch=field->enumarray;
 202              *enumsearch && strcmp(*enumsearch,batlinevalue);
 203              (*field->valuep)++, enumsearch++);
 204         if (!*enumsearch)
 205           batfailf("unknown enum value");
 206
 207       }
 208     }
 209
 210     fclose(batfile);
 211     batfile= 0;
 212   }
 213
 214   if (!(thisbat_alarm_present==0 ||
 215         thisbat_info_present==0 ||
 216         thisbat_state_present==0)) {
 217     if (thisbat_alarm_present == VAL_NOTFOUND)
 218       thisbat_alarm_present= 1;
 219
 220     for (field=fields, missing=0;
 221          field->file;
 222          field++) {
 223       if (*field->valuep == VAL_NOTFOUND) {
 224         fprintf(stderr,"battery/%s/%s: %s: not found\n",
 225                 batdirname, field->file,field->label);
 226         missing++;
 227       }
 228     }
 229     if (missing) return -1;
 230   }
 231
 232   r= chdir("..");
 233   if (r) return batfaile("chdir","..");
 234   batdirname= 0;
 235
 236   return 0;
 237 }
 238
 239 /*---------- data collection and analysis ----------*/
 240
 241 /* These next three variables are the results of the charging state */
 242 static unsigned charging_state_mask; /* 1u<<CHGST_* | ... */
 243 static double nondegraded_norm, fill_norm, ratepersec_norm;
 244 static int alarm_level; /* 0=ok, 1=low */
 245
 246 #define QF(f,l,u) \
 247   static double total_##f##_##l;
 248   QUANTITY_FIELDS
 249 #undef QF
 250
 251 static void acquiredata(void) {
 252   DIR *di;
 253   struct dirent *de;
 254   int r;
 255
 256   charging_state_mask= 0;
 257
 258 #define QF(f,l,u) \
 259   total_##f##_##l= 0;
 260   QUANTITY_FIELDS
 261 #undef QF
 262
 263   di= opendir(".");  if (!di) batfaile("opendir","battery");
 264   while ((de= readdir(di))) {
 265     if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
 266
 267     batdirname= de->d_name;
 268     r= readbattery();
 269     tidybattery();
 270
 271     if (r) { charging_state_mask |= CHGST_ERROR; continue; }
 272
 273     if (!thisbat_info_present || !thisbat_state_present)
 274       continue;
 275
 276     charging_state_mask |= 1u << thisbat_state_charging_state;
 277
 278 #define QF(f,l,u) \
 279     total_##f##_##l += thisbat_##f##_##l;
 280     QUANTITY_FIELDS
 281 #undef QF
 282
 283     if (thisbat_state_charging_state == CHGST_DISCHARGING)
 284       /* negate it */
 285       total_state_present_rate -= 2.0 * thisbat_state_present_rate;
 286
 287   }
 288   closedir(di);
 289
 290   if (total_info_design_capacity < 0.5)
 291     total_info_design_capacity= 1.0;
 292
 293   if (total_info_last_full_capacity < total_state_remaining_capacity)
 294     total_info_last_full_capacity= total_state_remaining_capacity;
 295   if (total_info_design_capacity < total_info_last_full_capacity)
 296     total_info_design_capacity= total_info_last_full_capacity;
 297
 298   alarm_level=
 299     (total_state_remaining_capacity < total_alarm_alarm &&
 300      !(charging_state_mask & 1u << CHGST_CHARGING));
 301
 302   nondegraded_norm= total_info_last_full_capacity / total_info_design_capacity;
 303   fill_norm= total_state_remaining_capacity / total_info_design_capacity;
 304   ratepersec_norm=  total_state_present_rate
 305     / (3600.0 * total_info_design_capacity);
 306 }
 307
 308 static void initacquire(void) {
 309   chdir_base();
 310 }
 311
 312 /*---------- argument parsing ----------*/
 313
 314 #define COLOURS                                 \
 315   C(blue,      discharging)                     \
 316   C(green,     charging)                        \
 317   C(cyan,      charged)                         \
 318   C(grey,      confusing)                       \
 319   C(black,     normal)                          \
 320   C(red,       low)                             \
 321   C(dimgrey,   degraded)                        \
 322   C(darkgreen, absent)                          \
 323   C(yellow,    error)                           \
 324   C(white,     equilibrium)                     \
 325   GC(remain)                                    \
 326   GC(white)                                     \
 327   GC(empty)
 328
 329 static XrmDatabase xrm;
 330
 331 static const char defaultresources[]=
 332 #define GC(g)
 333 #define C(c,u)                                  \
 334   "*" #u "Color: " #c "\n"
 335   COLOURS
 336 #undef GC
 337 #undef C
 338   ;
 339
 340 #define S(s) ((char*)(s))
 341 static const XrmOptionDescRec optiontable[]= {
 342   { S("-display"),      S("*display"),      XrmoptionSepArg },
 343   { S("-geometry"),     S("*geometry"),     XrmoptionSepArg },
 344 #define GC(g)
 345 #define C(c,u)                                                  \
 346   { S("-" #u "Color"),  S("*" #u "Color"),  XrmoptionSepArg },  \
 347   { S("-" #u "Colour"), S("*" #u "Color"),  XrmoptionSepArg },
 348   COLOURS
 349 #undef GC
 350 #undef C
 351 };
 352
 353 static void parseargs(int argc, char **argv) {
 354   XrmInitialize();
 355
 356   xrm= XrmGetStringDatabase((char*)defaultresources);
 357   if (!xrm) fail("xrmgetstringdatabase");
 358
 359   XrmParseCommand(&xrm, (XrmOptionDescRec*)optiontable,
 360                   sizeof(optiontable)/sizeof(*optiontable),
 361                   program_name, &argc, argv);
 362
 363   /*  if (argc>0) badusage();*/
 364 }
 365
 366 static const char *getresource(const char *want) {
 367   char name_buf[256], class_buf[256];
 368   XrmValue val;
 369   char *rep_type_dummy;
 370   int r;
 371
 372   assert(strlen(want) < 128);
 373   sprintf(name_buf,"xacpi-simple.%s",want);
 374   sprintf(class_buf,"Xacpi-Simple.%s",want);
 375
 376   r= XrmGetResource(xrm, name_buf,class_buf, &rep_type_dummy, &val);
 377   if (!r) return 0;
 378
 379   return val.addr;
 380 }
 381
 382 /*---------- display ----------*/
 383
 384 static Display *disp;
 385 static Window win;
 386 static int width, height;
 387 static Colormap cmap;
 388 static int screen;
 389 static unsigned long lastbackground;
 390
 391 typedef struct {
 392   GC gc;
 393   unsigned long lastfg;
 394 } Gcstate;
 395
 396 #define C(c,u) static unsigned long pix_##c;
 397 #define GC(g) static Gcstate gc_##g;
 398   COLOURS
 399 #undef C
 400 #undef GC
 401
 402 static void refresh(void);
 403
 404 #define CHGMASK_CHG_DIS (1u<<CHGST_CHARGING | 1u<<CHGST_DISCHARGING)
 405
 406 static void failr(const char *m, int r) {
 407   fprintf(stderr,"error: %s (code %d)\n", m, r);
 408   exit(-1);
 409 }
 410
 411 static void setbackground(unsigned long newbg) {
 412   int r;
 413
 414   if (newbg == lastbackground) return;
 415   r= XSetWindowBackground(disp,win,newbg);
 416   if (!r) fail("XSetWindowBackground");
 417   lastbackground= newbg;
 418 }
 419
 420 static void setforeground(Gcstate *g, unsigned long px) {
 421   XGCValues gcv;
 422   int r;
 423
 424   if (g->lastfg == px) return;
 425
 426   memset(&gcv,0,sizeof(gcv));
 427   g->lastfg= gcv.foreground= px;
 428   r= XChangeGC(disp,g->gc,GCForeground,&gcv);
 429   if (!r) fail("XChangeGC");
 430 }
 431
 432 static void show_solid(unsigned long px) {
 433   setbackground(px);
 434   XClearWindow(disp,win);
 435 }
 436
 437 static void show(void) {
 438   double elap, then;
 439   int i, leftmost_lit, leftmost_nondeg, beyond, first_beyond;
 440
 441   if (!charging_state_mask)
 442     return show_solid(pix_darkgreen);
 443
 444   if (charging_state_mask & CHGST_ERROR)
 445     return show_solid(pix_yellow);
 446
 447   setbackground(pix_dimgrey);
 448   XClearWindow(disp,win);
 449
 450   setforeground(&gc_remain,
 451                 !(charging_state_mask & CHGMASK_CHG_DIS) ? pix_cyan :
 452                 !(~charging_state_mask & CHGMASK_CHG_DIS) ? pix_grey :
 453                 charging_state_mask & (1u<<CHGST_CHARGING)
 454                 ? pix_green : pix_blue);
 455
 456   setforeground(&gc_empty, alarm_level ? pix_red : pix_black);
 457
 458   for (i=0, first_beyond=1; i<height; i++) {
 459     elap= !i ? 0 :
 460       height==2 ? BOTTOM :
 461       TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
 462
 463     then= fill_norm + ratepersec_norm * elap;
 464
 465     beyond=
 466       ((charging_state_mask & (1u<<CHGST_DISCHARGING) && then <= 0.0) ||
 467        (charging_state_mask & (1u<<CHGST_CHARGING) && then>=nondegraded_norm));
 468
 469     if (then <= 0.0) then= 0.0;
 470     else if (then >= nondegraded_norm) then= nondegraded_norm;
 471
 472     leftmost_lit= width * then;
 473     leftmost_nondeg= width * nondegraded_norm;
 474
 475     if (beyond && first_beyond) {
 476       XDrawLine(disp, win, gc_white.gc, 0,i, leftmost_nondeg,i);
 477       first_beyond= 0;
 478     } else {
 479       if (leftmost_lit < leftmost_nondeg)
 480         XDrawLine(disp, win, gc_empty.gc,
 481                   leftmost_lit,i, leftmost_nondeg,i);
 482       if (leftmost_lit >= 0)
 483         XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
 484     }
 485   }
 486 }
 487
 488 static void initgc(Gcstate *gc_r) {
 489   XGCValues gcv;
 490
 491   memset(&gcv,0,sizeof(gcv));
 492   gcv.function= GXcopy;
 493   gcv.line_width= 1;
 494   gc_r->lastfg= gcv.foreground= pix_white;
 495   gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
 496 }
 497
 498 static void colour(unsigned long *pix_r, const char *whichcolour) {
 499   XColor xc;
 500   const char *name;
 501   Status st;
 502
 503   name= getresource(whichcolour);
 504   if (!name) fail("get colour resource");
 505
 506   st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
 507   if (!st) fail(name);
 508
 509   *pix_r= xc.pixel;
 510 }
 511
 512 static void initgraphics(int argc, char **argv) {
 513   int r;
 514   const char *geom_string;
 515   XSizeHints *normal_hints;
 516   XWMHints *wm_hints;
 517   XClassHint *class_hint;
 518   int pos_x, pos_y, gravity;
 519   char *program_name_silly;
 520
 521   program_name_silly= (char*)program_name;
 522
 523   disp= XOpenDisplay(getresource("display"));
 524   if (!disp) fail("could not open display");
 525
 526   screen= DefaultScreen(disp);
 527
 528   normal_hints= XAllocSizeHints();
 529   wm_hints= XAllocWMHints();
 530   class_hint= XAllocClassHint();
 531
 532   if (!normal_hints || !wm_hints || !class_hint)
 533     fail("could not alloc hint(s)");
 534
 535   geom_string= getresource("geometry");
 536
 537   r= XWMGeometry(disp,screen, geom_string,"128x32", 0,
 538                  normal_hints,
 539                  &pos_x, &pos_y,
 540                  &width, &height,
 541                  &gravity);
 542
 543   win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),
 544                            pos_x,pos_y,width,height,0,0,0);
 545   cmap= DefaultColormap(disp,screen);
 546
 547 #define C(c,u) colour(&pix_##c, #u "Color");
 548 #define GC(g) initgc(&gc_##g);
 549   COLOURS
 550 #undef C
 551 #undef GC
 552
 553   r= XSetWindowBackground(disp,win,pix_dimgrey);
 554   if (!r) fail("init set background");
 555   lastbackground= pix_dimgrey;
 556
 557   normal_hints->flags= PWinGravity;
 558   normal_hints->win_gravity= gravity;
 559   normal_hints->x= pos_x;
 560   normal_hints->y= pos_y;
 561   normal_hints->width= width;
 562   normal_hints->height= height;
 563   if (geom_string) normal_hints->flags |= USPosition;
 564
 565   wm_hints->flags= InputHint;
 566   wm_hints->input= False;
 567
 568   class_hint->res_name= program_name_silly;
 569   class_hint->res_class= program_name_silly;
 570
 571   XmbSetWMProperties(disp,win, program_name,program_name,
 572                      argv,argc, normal_hints, wm_hints, class_hint);
 573
 574   XSelectInput(disp,win, ExposureMask|StructureNotifyMask);
 575   XMapWindow(disp,win);
 576 }
 577
 578 static void refresh(void) {
 579   acquiredata();
 580   show();
 581 }
 582
 583 static void newgeometry(void) {
 584   int dummy;
 585   Window dummyw;
 586
 587   XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
 588 }
 589
 590 static void eventloop(void) {
 591   XEvent ev;
 592   struct pollfd pfd;
 593   int r, timeout;
 594
 595   newgeometry();
 596   refresh();
 597
 598   for (;;) {
 599     XFlush(disp);
 600
 601     pfd.fd= ConnectionNumber(disp);
 602     pfd.events= POLLIN|POLLERR;
 603
 604     timeout= !(charging_state_mask & CHGST_ERROR) ? TIMEOUT : TIMEOUT_ONERROR;
 605     r= poll(&pfd,1,timeout);
 606     if (r==-1 && errno!=EINTR) failr("poll",errno);
 607
 608     while (XPending(disp)) {
 609       XNextEvent(disp,&ev);
 610       if (ev.type == ConfigureNotify) {
 611         XConfigureEvent *ce= (void*)&ev;
 612         width= ce->width;
 613         height= ce->height;
 614       }
 615     }
 616     refresh();
 617   }
 618 }
 619
 620 int main(int argc, char **argv) {
 621   parseargs(argc,argv);
 622   initacquire();
 623   initgraphics(argc,argv);
 624   eventloop();
 625   return 0;
 626 }