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