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  *     darkcyan |  black        |  dimgrey      none of the above
  10  *     blue     |  red          |  dimgrey      discharging - low!
  11  *     green    |  red          |  dimgrey      charging - low
  12  *     cyan     |  red          |  dimgrey      charged - low [1]
  13  *     grey     |  red          |  dimgrey      charging&discharching, low [1]
  14  *       ...  darkgreen  ...                    no batteries present
  15  *       ...  yellow  ...                       error
  16  *
  17  * [1] battery must be quite badly degraded
  18  */
  19 /*
  20  * Copyright (C) 2004 Ian Jackson <ian@davenant.greenend.org.uk>
  21  *
  22  * This is free software; you can redistribute it and/or modify
  23  * it under the terms of the GNU General Public License as
  24  * published by the Free Software Foundation; either version 3,
  25  * or (at your option) any later version.
  26  *
  27  * This is distributed in the hope that it will be useful, but
  28  * WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public
  33  * License along with this file; if not, consult the Free Software
  34  * Foundation's website at www.fsf.org, or the GNU Project website at
  35  * www.gnu.org.
  36  */
  37
  38 #include <stdio.h>
  39 #include <assert.h>
  40 #include <math.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <errno.h>
  44 #include <unistd.h>
  45 #include <ctype.h>
  46 #include <stdint.h>
  47 #include <limits.h>
  48 #include <inttypes.h>
  49
  50 #include <sys/poll.h>
  51 #include <sys/types.h>
  52 #include <dirent.h>
  53
  54 #include <X11/Xlib.h>
  55 #include <X11/Xutil.h>
  56 #include <X11/Xresource.h>
  57
  58 #define TOP      60
  59 #define BOTTOM 3600
  60
  61 #define TIMEOUT         5000 /* milliseconds */
  62 #define TIMEOUT_ONERROR 3333 /* milliseconds */
  63
  64 static const char program_name[]= "xacpi-simple";
  65 static int debug, alarmlevel;
  66
  67 /*---------- general utility stuff and declarations ----------*/
  68
  69 static void fail(const char *m) {
  70   fprintf(stderr,"error: %s\n", m);
  71   exit(-1);
  72 }
  73 static void badusage(void) { fail("bad usage"); }
  74
  75 typedef uint64_t value;
  76 #define VAL_NOTFOUND (~(value)0)
  77
  78 typedef struct fileinfo fileinfo;
  79 typedef int parser(const fileinfo*);
  80
  81 static parser parse_uevent;
  82
  83 struct fileinfo {
  84   const char *filename;
  85   parser *parse;
  86   const void *extra;
  87 };
  88
  89 /*---------- structure of and results from /sys/class/power/... ----------*/
  90 /* variables this_... are the results from readbattery();
  91  * if readbattery() succeeds the appropriate ones are all valid
  92  * and not VAL_NOTFOUND
  93  */
  94
  95 typedef struct batinfo_field {
  96   const char *label;
  97   value *valuep;
  98   const char *enumarray[10];
  99 } batinfo_field;
 100
 101 #define BAT_QTYS(_, _ec, EC_, PC_)                              \
 102   _(design_capacity##_ec,    BATTERY,  EC_##FULL_DESIGN )       \
 103   _(last_full_capacity##_ec, BATTERY,  EC_##FULL        )       \
 104   _(remaining_capacity##_ec, BATTERY,  EC_##NOW         )       \
 105   _(present_rate##_ec,       BATTERY,  PC_##NOW         )
 106  /* ENERGY [mWh]; POWER [mW]; CHARGE [uAh]; CURRENT [uA] */
 107
 108 #define UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)                     \
 109   _(present,                 BATTERY,  PRESENT /* bool */ )     \
 110   _(online,                  MAINS,    ONLINE  /* bool */ )
 111
 112 #define UEVENT_FUNKY_QUANTITY_FIELDS(_)         \
 113   BAT_QTYS(_,_energy,ENERGY_,POWER_)            \
 114   BAT_QTYS(_,_charge,CHARGE_,CURRENT_)
 115
 116 #define UEVENT_OPTIONAL_QUANTITY_FIELDS(_)                      \
 117   _(voltage,                 BATTERY,  VOLTAGE_NOW /* uV */ )
 118
 119 #define UEVENT_ENUM_FIELDS(_)                                           \
 120   _(state,   BATTERY,  STATUS,  "Discharging","Charging","Full","Unknown" ) \
 121   _(type,    BOTH,     TYPE,    "Mains",       "Battery"              )
 122
 123 #define CHGST_DISCHARGING 0 /* Reflects order in _(state,...) above     */
 124 #define CHGST_CHARGING    1 /* Also, much code assumes exactly          */
 125 #define CHGST_CHARGED     2 /* these three possible states.             */
 126 #define CHGST_UNKNOWN     3 /* these three possible states.             */
 127 #define CHGST_ERROR       8 /* Except that this one is an extra bit.    */
 128
 129 #define TYPE_MAINS        0 /* Reflects order in _(type,...) above        */
 130 #define TYPE_BATTERY      1 /* Also, much code assumes exactly these two  */
 131 #define TYPE_BOTH       100 /* Except this is a magic invalid value.      */
 132
 133 #define SEPARATE_QUANTITY_FIELDS(_)             \
 134   /* See commit ec6f5f0be800bc5f2a27046833dba04e0c67ffac for
 135      the code needed to use this */
 136
 137
 138 #define ALL_DIRECT_VARS(_)                      \
 139   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 140   UEVENT_FUNKY_QUANTITY_FIELDS(_)               \
 141   UEVENT_OPTIONAL_QUANTITY_FIELDS(_)            \
 142   UEVENT_ENUM_FIELDS(_)                         \
 143   SEPARATE_QUANTITY_FIELDS(_)
 144
 145 #define ALL_VARS(_)                             \
 146   ALL_DIRECT_VARS(_)                            \
 147   BAT_QTYS(_,,,)
 148
 149 #define ALL_NEEDED_FIELDS(_)                    \
 150   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 151   UEVENT_ENUM_FIELDS(_)                         \
 152   SEPARATE_QUANTITY_FIELDS(_)
 153
 154 #define ALL_PLAIN_ACCUMULATE_FIELDS(_)          \
 155   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 156   UEVENT_ENUM_FIELDS(_)                         \
 157   SEPARATE_QUANTITY_FIELDS(_)
 158
 159 #define ALL_ACCUMULATE_FIELDS(_)                \
 160   ALL_PLAIN_ACCUMULATE_FIELDS(_)                \
 161   BAT_QTYS(_,,,)
 162
 163
 164 #define F_VAR(f,...) \
 165 static value this_##f;
 166 ALL_VARS(F_VAR)
 167
 168 #define Q_FLD(f,t,l)        { "POWER_SUPPLY_" #l, &this_##f },
 169 #define E_FLD(f,t,l,vl...)  { "POWER_SUPPLY_" #l, &this_##f, { vl } },
 170
 171 static const batinfo_field uevent_fields[]= {
 172   UEVENT_ESSENTIAL_QUANTITY_FIELDS(Q_FLD)
 173   UEVENT_FUNKY_QUANTITY_FIELDS(Q_FLD)
 174   UEVENT_OPTIONAL_QUANTITY_FIELDS(Q_FLD)
 175   UEVENT_ENUM_FIELDS(E_FLD)
 176   { 0 }
 177 };
 178
 179 #define S_FLD(f,t,fn,vl...)                                             \
 180 static const batinfo_field bif_##f = { 0, &this_##f, { vl } };
 181   SEPARATE_QUANTITY_FIELDS(S_FLD)
 182
 183 #define S_FILE(f,t,fn,vl...) { fn, parse_separate, &bif_##f },
 184
 185 static const fileinfo files[]= {
 186   { "uevent",  parse_uevent,  uevent_fields },
 187   SEPARATE_QUANTITY_FIELDS(S_FILE)
 188   { 0 }
 189 };
 190
 191 /*---------- parsing of one thingx in /sys/class/power/... ----------*/
 192
 193 /* variables private to the parser and its error handlers */
 194 static char batlinebuf[1000];
 195 static FILE *batfile;
 196 static const char *batdirname;
 197 static const char *batfilename;
 198 static const char *batlinevalue;
 199
 200 static int batfailf(const char *why) {
 201   if (batlinevalue) {
 202     fprintf(stderr,"%s/%s: %s value `%s': %s\n",
 203             batdirname,batfilename, batlinebuf,batlinevalue,why);
 204   } else {
 205     fprintf(stderr,"%s/%s: %s: `%s'\n",
 206             batdirname,batfilename, why, batlinebuf);
 207   }
 208   return -1;
 209 }
 210
 211 static int batfailc(const char *why) {
 212   fprintf(stderr,"%s/%s: %s\n",
 213           batdirname,batfilename, why);
 214   return -1;
 215 }
 216
 217 static int batfaile(const char *syscall, const char *target) {
 218   fprintf(stderr,"%s: failed to %s %s: %s\n",
 219           batdirname ? batdirname : "*", syscall, target, strerror(errno));
 220   return -1;
 221 }
 222
 223 static int chdir_base(void) {
 224   int r;
 225
 226   r= chdir("/sys/class/power_supply");
 227   if (r) return batfaile("chdir","/sys/class/power_supply");
 228
 229   return 0;
 230 }
 231
 232 static void tidybattery(void) {
 233   if (batfile) { fclose(batfile); batfile=0; }
 234 }
 235
 236 static int parse_value(const fileinfo *cfile, const batinfo_field *field) {
 237   if (*field->valuep != VAL_NOTFOUND)
 238     return batfailf("value specified multiple times");
 239
 240   if (!field->enumarray[0]) {
 241
 242     char *ep;
 243     *field->valuep= strtoull(batlinevalue,&ep,10);
 244     if (*ep)
 245       batfailf("value number syntax incorrect");
 246
 247   } else {
 248
 249     const char *const *enumsearch;
 250     for (*field->valuep=0, enumsearch=field->enumarray;
 251          *enumsearch && strcmp(*enumsearch,batlinevalue);
 252          (*field->valuep)++, enumsearch++);
 253     if (!*enumsearch)
 254       batfailf("unknown enum value");
 255
 256   }
 257   return 0;
 258 }
 259
 260 static int parse_uevent(const fileinfo *cfile) {
 261   char *equals= strchr(batlinebuf,'=');
 262   if (!equals)
 263     return batfailf("line without a equals");
 264   *equals= 0;
 265   batlinevalue = equals+1;
 266
 267   const batinfo_field *field;
 268   for (field=cfile->extra; field->label; field++) {
 269     if (!strcmp(field->label,batlinebuf))
 270       goto found;
 271   }
 272   return 0;
 273
 274  found:
 275   return parse_value(cfile, field);
 276 }
 277
 278 static int readbattery(void) { /* 0=>ok, -1=>couldn't */
 279
 280   const fileinfo *cfile;
 281   char *sr;
 282   int r, l;
 283
 284   r= chdir_base();
 285   if (r) return r;
 286
 287   r= chdir(batdirname);
 288   if (r) return batfaile("chdir",batdirname);
 289
 290 #define V_NOTFOUND(f,...) \
 291   this_##f = VAL_NOTFOUND;
 292 ALL_VARS(V_NOTFOUND)
 293
 294   for (cfile=files;
 295        (batfilename= cfile->filename);
 296        cfile++) {
 297     batfile= fopen(batfilename,"r");
 298     if (!batfile) {
 299       if (errno == ENOENT) continue;
 300       return batfaile("open",batfilename);
 301     }
 302
 303     for (;;) {
 304       batlinevalue= 0;
 305
 306       sr= fgets(batlinebuf,sizeof(batlinebuf),batfile);
 307       if (ferror(batfile)) return batfaile("read",batfilename);
 308       if (!sr && feof(batfile)) break;
 309       l= strlen(batlinebuf);
 310       assert(l>0);
 311       if (batlinebuf[l-1] != '\n')
 312         return batfailf("line too long");
 313       batlinebuf[l-1]= 0;
 314
 315       if (cfile->parse(cfile))
 316         return -1;
 317     }
 318
 319     fclose(batfile);
 320     batfile= 0;
 321   }
 322
 323   if (debug) {
 324     printf("%s:\n",batdirname);
 325 #define V_PRINT(f,...)                                  \
 326     printf(" %-30s = %20"PRId64"\n", #f, (int64_t)this_##f);
 327 ALL_DIRECT_VARS(V_PRINT)
 328   }
 329
 330   int needsfields_MAINS   = this_type == TYPE_MAINS;
 331   int needsfields_BATTERY = this_type == TYPE_BATTERY;
 332   int needsfields_BOTH    = 1;
 333
 334   int missing = 0;
 335
 336 #define V_NEEDED(f,t,...)                               \
 337   if (needsfields_##t && this_##f == VAL_NOTFOUND) {    \
 338     fprintf(stderr,"%s: %s: not found\n",               \
 339             batdirname, #f);                            \
 340     missing++;                                          \
 341   }
 342 ALL_NEEDED_FIELDS(V_NEEDED)
 343
 344   if (missing) return -1;
 345
 346   return 0;
 347 }
 348
 349 /*---------- data collection and analysis ----------*/
 350
 351 /* These next three variables are the results of the charging state */
 352 static unsigned charging_mask; /* 1u<<CHGST_* | ... */
 353 static double nondegraded_norm, fill_norm, ratepersec_norm;
 354 static int alarmed;
 355
 356 #define Q_VAR(f,t,...) \
 357 static double total_##f;
 358   ALL_ACCUMULATE_FIELDS(Q_VAR)
 359
 360 static void acquiredata(void) {
 361   DIR *di;
 362   struct dirent *de;
 363   int r;
 364
 365   charging_mask= 0;
 366   alarmed = 0;
 367
 368 #define Q_ZERO(f,t,...) \
 369   total_##f= 0;
 370 ALL_ACCUMULATE_FIELDS(Q_ZERO)
 371
 372   r = chdir_base();
 373   if (r) goto bad;
 374
 375   di= opendir(".");  if (!di) { batfaile("opendir","battery"); goto bad; }
 376   while ((de= readdir(di))) {
 377     if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
 378
 379     batdirname= de->d_name;
 380     r= readbattery();
 381     tidybattery();
 382
 383     if (r) {
 384     bad:
 385       charging_mask |= (1u << CHGST_ERROR);
 386       break;
 387     }
 388
 389     if (this_type == TYPE_BATTERY) {
 390       if (!this_present)
 391         continue;
 392
 393       charging_mask |= 1u << this_state;
 394
 395 #define QTY_SUPPLIED(f,...)   this_##f != VAL_NOTFOUND &&
 396 #define QTY_USE_ENERGY(f,...) this_##f = this_##f##_energy;
 397 #define QTY_USE_CHARGE(f,...) this_##f = this_##f##_charge;
 398
 399       double funky_multiplier;
 400       if (BAT_QTYS(QTY_SUPPLIED,_energy,,) 1) {
 401         if (debug) printf(" using energy\n");
 402         BAT_QTYS(QTY_USE_ENERGY,,,);
 403         funky_multiplier = 1.0;
 404       } else if (BAT_QTYS(QTY_SUPPLIED,_charge,,)
 405                  this_voltage != VAL_NOTFOUND) {
 406         if (debug) printf(" using charge\n");
 407         BAT_QTYS(QTY_USE_CHARGE,,,);
 408         funky_multiplier = this_voltage * 1e-6;
 409       } else {
 410         batfailc("neither complete set of energy nor charge");
 411         continue;
 412       }
 413       if (this_state == CHGST_DISCHARGING)
 414         /* negate it */
 415         total_present_rate -= 2.0 * this_present_rate * funky_multiplier;
 416
 417 #define Q_ACCUMULATE_FUNKY(f,...)                       \
 418       total_##f += this_##f * funky_multiplier;
 419 BAT_QTYS(Q_ACCUMULATE_FUNKY,,,)
 420     }
 421
 422 #define Q_ACCUMULATE_PLAIN(f,t,...)                     \
 423     if (this_type == TYPE_##t)                  \
 424       total_##f += this_##f;
 425 ALL_PLAIN_ACCUMULATE_FIELDS(Q_ACCUMULATE_PLAIN)
 426
 427
 428   }
 429   closedir(di);
 430
 431   printf("TOTAL:\n");
 432 #define T_PRINT(f,...)                                  \
 433     printf(" %-30s = %20.6f\n", #f, total_##f);
 434 BAT_QTYS(T_PRINT,,,)
 435 ALL_PLAIN_ACCUMULATE_FIELDS(T_PRINT)
 436   }
 437
 438   if ((charging_mask & (1u<<CHGST_DISCHARGING)) &&
 439       !total_online/*mains*/) {
 440     double time_remaining =
 441       -total_remaining_capacity * 3600.0 / total_present_rate;
 442     if (debug) printf(" %-30s = %20.6f\n", "time remaining", time_remaining);
 443     if (time_remaining < alarmlevel)
 444       alarmed = 1;
 445   }
 446
 447   if (total_design_capacity < 0.5)
 448     total_design_capacity= 1.0;
 449
 450   if (total_last_full_capacity < total_remaining_capacity)
 451     total_last_full_capacity= total_remaining_capacity;
 452   if (total_design_capacity < total_last_full_capacity)
 453     total_design_capacity= total_last_full_capacity;
 454
 455   nondegraded_norm= total_last_full_capacity / total_design_capacity;
 456   fill_norm= total_remaining_capacity / total_design_capacity;
 457   ratepersec_norm=  total_present_rate
 458     / (3600.0 * total_design_capacity);
 459 }
 460
 461 static void initacquire(void) {
 462 }
 463
 464 /*---------- argument parsing ----------*/
 465
 466 #define COLOURS                                 \
 467   C(blue,      discharging)                     \
 468   C(green,     charging)                        \
 469   C(cyan,      charged)                         \
 470   C(darkcyan,  notcharging)                     \
 471   C(grey,      confusing)                       \
 472   C(black,     normal)                          \
 473   C(red,       low)                             \
 474   C(dimgrey,   degraded)                        \
 475   C(darkgreen, absent)                          \
 476   C(yellow,    error)                           \
 477   C(white,     equilibrium)                     \
 478   GC(remain)                                    \
 479   GC(white)                                     \
 480   GC(empty)
 481
 482 static XrmDatabase xrm;
 483 static Display *disp;
 484 static int screen;
 485
 486 static const char defaultresources[]=
 487 #define GC(g)
 488 #define C(c,u)                                  \
 489   "*" #u "Color: " #c "\n"
 490   COLOURS
 491 #undef GC
 492 #undef C
 493   ;
 494
 495 #define S(s) ((char*)(s))
 496 static const XrmOptionDescRec optiontable[]= {
 497   { S("-debug"),        S("*debug"),        XrmoptionIsArg },
 498   { S("-warningTime"),  S("*warningTime"),  XrmoptionSepArg },
 499   { S("-display"),      S("*display"),      XrmoptionSepArg },
 500   { S("-geometry"),     S("*geometry"),     XrmoptionSepArg },
 501 #define GC(g)
 502 #define C(c,u)                                                  \
 503   { S("-" #u "Color"),  S("*" #u "Color"),  XrmoptionSepArg },  \
 504   { S("-" #u "Colour"), S("*" #u "Color"),  XrmoptionSepArg },
 505   COLOURS
 506 #undef GC
 507 #undef C
 508 };
 509
 510 static const char *getresource(const char *want) {
 511   char name_buf[256], class_buf[256];
 512   XrmValue val;
 513   char *rep_type_dummy;
 514   int r;
 515
 516   assert(strlen(want) < 128);
 517   sprintf(name_buf,"xacpi-simple.%s",want);
 518   sprintf(class_buf,"Xacpi-Simple.%s",want);
 519
 520   r= XrmGetResource(xrm, name_buf,class_buf, &rep_type_dummy, &val);
 521   if (!r) return 0;
 522
 523   return val.addr;
 524 }
 525
 526 static void more_resources(const char *str, const char *why) {
 527   XrmDatabase more;
 528
 529   if (!str) return;
 530
 531   more= XrmGetStringDatabase((char*)str);
 532   if (!more) fail(why);
 533   XrmCombineDatabase(more,&xrm,0);
 534 }
 535
 536 static void parseargs(int argc, char **argv) {
 537   Screen *screenscreen;
 538
 539   XrmInitialize();
 540
 541   XrmParseCommand(&xrm, (XrmOptionDescRec*)optiontable,
 542                   sizeof(optiontable)/sizeof(*optiontable),
 543                   program_name, &argc, argv);
 544
 545   if (argc>1) badusage();
 546
 547   debug= !!getresource("debug");
 548
 549   const char *alarmlevel_string= getresource("alarmLevel");
 550   alarmlevel = alarmlevel_string ? atoi(alarmlevel_string) : 300;
 551
 552   disp= XOpenDisplay(getresource("display"));
 553   if (!disp) fail("could not open display");
 554
 555   screen= DefaultScreen(disp);
 556
 557   screenscreen= ScreenOfDisplay(disp,screen);
 558   if (!screenscreen) fail("screenofdisplay");
 559   more_resources(XScreenResourceString(screenscreen), "screen resources");
 560   more_resources(XResourceManagerString(disp), "display resources");
 561   more_resources(defaultresources, "default resources");
 562 }
 563
 564 /*---------- display ----------*/
 565
 566 static Window win;
 567 static int width, height;
 568 static Colormap cmap;
 569 static unsigned long lastbackground;
 570
 571 typedef struct {
 572   GC gc;
 573   unsigned long lastfg;
 574 } Gcstate;
 575
 576 #define C(c,u) static unsigned long pix_##c;
 577 #define GC(g) static Gcstate gc_##g;
 578   COLOURS
 579 #undef C
 580 #undef GC
 581
 582 static void refresh(void);
 583
 584 #define CHGMASK_CHG_DIS ((1u<<CHGST_CHARGING) | (1u<<CHGST_DISCHARGING))
 585
 586 static void failr(const char *m, int r) {
 587   fprintf(stderr,"error: %s (code %d)\n", m, r);
 588   exit(-1);
 589 }
 590
 591 static void setbackground(unsigned long newbg) {
 592   int r;
 593
 594   if (newbg == lastbackground) return;
 595   r= XSetWindowBackground(disp,win,newbg);
 596   if (!r) fail("XSetWindowBackground");
 597   lastbackground= newbg;
 598 }
 599
 600 static void setforeground(Gcstate *g, unsigned long px) {
 601   XGCValues gcv;
 602   int r;
 603
 604   if (g->lastfg == px) return;
 605
 606   memset(&gcv,0,sizeof(gcv));
 607   g->lastfg= gcv.foreground= px;
 608   r= XChangeGC(disp,g->gc,GCForeground,&gcv);
 609   if (!r) fail("XChangeGC");
 610 }
 611
 612 static void show_solid(unsigned long px) {
 613   setbackground(px);
 614   XClearWindow(disp,win);
 615 }
 616
 617 static void show(void) {
 618   double elap, then;
 619   int i, leftmost_lit, leftmost_nondeg, beyond, first_beyond;
 620
 621   if (!charging_mask)
 622     return show_solid(pix_darkgreen);
 623
 624   if (charging_mask & (1u << CHGST_ERROR))
 625     return show_solid(pix_yellow);
 626
 627   setbackground(pix_dimgrey);
 628   XClearWindow(disp,win);
 629
 630   setforeground(&gc_remain,
 631                 !(charging_mask & CHGMASK_CHG_DIS) ?
 632                 (~charging_mask & (1u << CHGST_CHARGED) ?
 633                  pix_darkcyan : pix_cyan) :
 634                 !(~charging_mask & CHGMASK_CHG_DIS) ? pix_grey :
 635                 charging_mask & (1u<<CHGST_CHARGING)
 636                 ? pix_green : pix_blue);
 637
 638   setforeground(&gc_empty, alarmed ? pix_red : pix_black);
 639
 640   for (i=0, first_beyond=1; i<height; i++) {
 641     elap= !i ? 0 :
 642       height==2 ? BOTTOM :
 643       TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
 644
 645     then= fill_norm + ratepersec_norm * elap;
 646
 647     beyond=
 648       ((charging_mask & (1u<<CHGST_DISCHARGING) && then <= 0.0) ||
 649        (charging_mask & (1u<<CHGST_CHARGING) && then>=nondegraded_norm));
 650
 651     if (then <= 0.0) then= 0.0;
 652     else if (then >= nondegraded_norm) then= nondegraded_norm;
 653
 654     leftmost_lit= width * then;
 655     leftmost_nondeg= width * nondegraded_norm;
 656
 657     if (beyond && first_beyond) {
 658       XDrawLine(disp, win, gc_white.gc, 0,i, leftmost_nondeg,i);
 659       first_beyond= 0;
 660     } else {
 661       if (leftmost_lit < leftmost_nondeg)
 662         XDrawLine(disp, win, gc_empty.gc,
 663                   leftmost_lit,i, leftmost_nondeg,i);
 664       if (leftmost_lit >= 0)
 665         XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
 666     }
 667   }
 668 }
 669
 670 static void initgc(Gcstate *gc_r) {
 671   XGCValues gcv;
 672
 673   memset(&gcv,0,sizeof(gcv));
 674   gcv.function= GXcopy;
 675   gcv.line_width= 1;
 676   gc_r->lastfg= gcv.foreground= pix_white;
 677   gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
 678 }
 679
 680 static void colour(unsigned long *pix_r, const char *whichcolour) {
 681   XColor xc;
 682   const char *name;
 683   Status st;
 684
 685   name= getresource(whichcolour);
 686   if (!name) fail("get colour resource");
 687
 688   st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
 689   if (!st) fail(name);
 690
 691   *pix_r= xc.pixel;
 692 }
 693
 694 static void initgraphics(int argc, char **argv) {
 695   int xwmgr, r;
 696   const char *geom_string;
 697   XSizeHints *normal_hints;
 698   XWMHints *wm_hints;
 699   XClassHint *class_hint;
 700   int pos_x, pos_y, gravity;
 701   char *program_name_silly;
 702
 703   program_name_silly= (char*)program_name;
 704
 705   normal_hints= XAllocSizeHints();
 706   wm_hints= XAllocWMHints();
 707   class_hint= XAllocClassHint();
 708
 709   if (!normal_hints || !wm_hints || !class_hint)
 710     fail("could not alloc hint(s)");
 711
 712   geom_string= getresource("geometry");
 713
 714   xwmgr= XWMGeometry(disp,screen, geom_string,"128x32", 0,
 715                  normal_hints,
 716                  &pos_x, &pos_y,
 717                  &width, &height,
 718                  &gravity);
 719
 720   win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),
 721                            pos_x,pos_y,width,height,0,0,0);
 722   cmap= DefaultColormap(disp,screen);
 723
 724 #define C(c,u) colour(&pix_##c, #u "Color");
 725 #define GC(g) initgc(&gc_##g);
 726   COLOURS
 727 #undef C
 728 #undef GC
 729
 730   r= XSetWindowBackground(disp,win,pix_dimgrey);
 731   if (!r) fail("init set background");
 732   lastbackground= pix_dimgrey;
 733
 734   normal_hints->flags= PWinGravity;
 735   normal_hints->win_gravity= gravity;
 736   normal_hints->x= pos_x;
 737   normal_hints->y= pos_y;
 738   normal_hints->width= width;
 739   normal_hints->height= height;
 740   if ((xwmgr & XValue) || (xwmgr & YValue))
 741     normal_hints->flags |= USPosition;
 742
 743   wm_hints->flags= InputHint;
 744   wm_hints->input= False;
 745
 746   class_hint->res_name= program_name_silly;
 747   class_hint->res_class= program_name_silly;
 748
 749   XmbSetWMProperties(disp,win, program_name,program_name,
 750                      argv,argc, normal_hints, wm_hints, class_hint);
 751
 752   XSelectInput(disp,win, ExposureMask|StructureNotifyMask);
 753   XMapWindow(disp,win);
 754 }
 755
 756 static void refresh(void) {
 757   acquiredata();
 758   show();
 759 }
 760
 761 static void newgeometry(void) {
 762   int dummy;
 763   unsigned int udummy, gotwidth, gotheight;
 764   Window dummyw;
 765
 766   XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &gotwidth,&gotheight,
 767                &udummy,&udummy);
 768   assert(gotwidth < INT_MAX);
 769   assert(gotheight < INT_MAX);
 770   width = gotwidth;
 771   height = gotheight;
 772 }
 773
 774 static void eventloop(void) {
 775   XEvent ev;
 776   struct pollfd pfd;
 777   int r, timeout;
 778
 779   newgeometry();
 780   refresh();
 781
 782   for (;;) {
 783     XFlush(disp);
 784
 785     pfd.fd= ConnectionNumber(disp);
 786     pfd.events= POLLIN|POLLERR;
 787
 788     timeout= !(charging_mask & (1u << CHGST_ERROR)) ? TIMEOUT : TIMEOUT_ONERROR;
 789     r= poll(&pfd,1,timeout);
 790     if (r==-1 && errno!=EINTR) failr("poll",errno);
 791
 792     while (XPending(disp)) {
 793       XNextEvent(disp,&ev);
 794       if (ev.type == ConfigureNotify) {
 795         XConfigureEvent *ce= (void*)&ev;
 796         width= ce->width;
 797         height= ce->height;
 798       }
 799     }
 800     refresh();
 801   }
 802 }
 803
 804 int main(int argc, char **argv) {
 805   parseargs(argc,argv);
 806   initacquire();
 807   initgraphics(argc,argv);
 808   eventloop();
 809   return 0;
 810 }