cprogs/xacpi-simple.c

   1 /* todo
   2  old way of doing alarm
   3 */
   4
   5 /*
   6  * display outputs, per line:
   7  *
   8  *   Remaining: | Empty:        | Degraded:
   9  *     blue     |  black        |  dimgrey      discharging
  10  *     green    |  black        |  dimgrey      charging
  11  *     cyan     |  black        |  dimgrey      charged
  12  *     grey     |  black        |  dimgrey      charging&discharching!
  13  *     darkcyan |  black        |  dimgrey      none of the above
  14  *     blue     |  red          |  dimgrey      discharging - low!
  15  *     green    |  red          |  dimgrey      charging - low
  16  *     cyan     |  red          |  dimgrey      charged - low [1]
  17  *     grey     |  red          |  dimgrey      charging&discharching, low [1]
  18  *       ...  darkgreen  ...                    no batteries present
  19  *       ...  yellow  ...                       error
  20  *
  21  * [1] battery must be quite badly degraded
  22  */
  23 /*
  24  * Copyright (C) 2004 Ian Jackson <ian@davenant.greenend.org.uk>
  25  *
  26  * This is free software; you can redistribute it and/or modify
  27  * it under the terms of the GNU General Public License as
  28  * published by the Free Software Foundation; either version 3,
  29  * or (at your option) any later version.
  30  *
  31  * This is distributed in the hope that it will be useful, but
  32  * WITHOUT ANY WARRANTY; without even the implied warranty of
  33  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  34  * GNU General Public License for more details.
  35  *
  36  * You should have received a copy of the GNU General Public
  37  * License along with this file; if not, consult the Free Software
  38  * Foundation's website at www.fsf.org, or the GNU Project website at
  39  * www.gnu.org.
  40  */
  41
  42 #include <stdio.h>
  43 #include <assert.h>
  44 #include <math.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <errno.h>
  48 #include <unistd.h>
  49 #include <ctype.h>
  50 #include <stdint.h>
  51 #include <limits.h>
  52 #include <inttypes.h>
  53
  54 #include <sys/poll.h>
  55 #include <sys/types.h>
  56 #include <dirent.h>
  57
  58 #include <X11/Xlib.h>
  59 #include <X11/Xutil.h>
  60 #include <X11/Xresource.h>
  61
  62 #define TOP      60
  63 #define BOTTOM 3600
  64
  65 #define TIMEOUT         5000 /* milliseconds */
  66 #define TIMEOUT_ONERROR 3333 /* milliseconds */
  67
  68 static const char program_name[]= "xacpi-simple";
  69 static int debug;
  70
  71 /*---------- general utility stuff and declarations ----------*/
  72
  73 static void fail(const char *m) {
  74   fprintf(stderr,"error: %s\n", m);
  75   exit(-1);
  76 }
  77 static void badusage(void) { fail("bad usage"); }
  78
  79 typedef uint64_t value;
  80 #define VAL_NOTFOUND (~(value)0)
  81
  82 typedef struct fileinfo fileinfo;
  83 typedef int parser(const fileinfo*);
  84
  85 static parser parse_uevent;
  86
  87 struct fileinfo {
  88   const char *filename;
  89   parser *parse;
  90   const void *extra;
  91 };
  92
  93 /*---------- structure of and results from /sys/class/power/... ----------*/
  94 /* variables this_... are the results from readbattery();
  95  * if readbattery() succeeds the appropriate ones are all valid
  96  * and not VAL_NOTFOUND
  97  */
  98
  99 typedef struct batinfo_field {
 100   const char *label;
 101   value *valuep;
 102   const char *enumarray[10];
 103 } batinfo_field;
 104
 105 #define BAT_QTYS(_, _ec, EC_, PC_)                              \
 106   _(design_capacity##_ec,    BATTERY,  EC_##FULL_DESIGN )       \
 107   _(last_full_capacity##_ec, BATTERY,  EC_##FULL        )       \
 108   _(remaining_capacity##_ec, BATTERY,  EC_##NOW         )       \
 109   _(present_rate##_ec,       BATTERY,  PC_##NOW         )
 110  /* ENERGY [mWh]; POWER [mW]; CHARGE [uAh]; CURRENT [uA] */
 111
 112 #define UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)                     \
 113   _(present,                 BATTERY,  PRESENT /* bool */ )     \
 114   _(online,                  MAINS,    ONLINE  /* bool */ )
 115
 116 #define UEVENT_FUNKY_QUANTITY_FIELDS(_)         \
 117   BAT_QTYS(_,_energy,ENERGY_,POWER_)            \
 118   BAT_QTYS(_,_charge,CHARGE_,CURRENT_)
 119
 120 #define UEVENT_OPTIONAL_QUANTITY_FIELDS(_)                      \
 121   _(voltage,                 BATTERY,  VOLTAGE_NOW /* uV */ )
 122
 123 #define UEVENT_ENUM_FIELDS(_)                                           \
 124   _(state,   BATTERY,  STATUS,  "Discharging","Charging","Full","Unknown" ) \
 125   _(type,    BOTH,     TYPE,    "Mains",       "Battery"              )
 126
 127 #define CHGST_DISCHARGING 0 /* Reflects order in _(state,...) above     */
 128 #define CHGST_CHARGING    1 /* Also, much code assumes exactly          */
 129 #define CHGST_CHARGED     2 /* these three possible states.             */
 130 #define CHGST_UNKNOWN     3 /* these three possible states.             */
 131 #define CHGST_ERROR       8 /* Except that this one is an extra bit.    */
 132
 133 #define TYPE_MAINS        0 /* Reflects order in _(type,...) above        */
 134 #define TYPE_BATTERY      1 /* Also, much code assumes exactly these two  */
 135 #define TYPE_BOTH       100 /* Except this is a magic invalid value.      */
 136
 137 #define SEPARATE_QUANTITY_FIELDS(_)             \
 138   _(alarm,   BATTERY,  "alarm", "0", "1")
 139
 140
 141 #define ALL_DIRECT_VARS(_)                      \
 142   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 143   UEVENT_FUNKY_QUANTITY_FIELDS(_)               \
 144   UEVENT_OPTIONAL_QUANTITY_FIELDS(_)            \
 145   UEVENT_ENUM_FIELDS(_)                         \
 146   SEPARATE_QUANTITY_FIELDS(_)
 147
 148 #define ALL_VARS(_)                             \
 149   ALL_DIRECT_VARS(_)                            \
 150   BAT_QTYS(_,,,)
 151
 152 #define ALL_NEEDED_FIELDS(_)                    \
 153   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 154   UEVENT_ENUM_FIELDS(_)                         \
 155   SEPARATE_QUANTITY_FIELDS(_)
 156
 157 #define ALL_PLAIN_ACCUMULATE_FIELDS(_)          \
 158   UEVENT_ESSENTIAL_QUANTITY_FIELDS(_)           \
 159   UEVENT_ENUM_FIELDS(_)                         \
 160   SEPARATE_QUANTITY_FIELDS(_)
 161
 162 #define ALL_ACCUMULATE_FIELDS(_)                \
 163   ALL_PLAIN_ACCUMULATE_FIELDS(_)                \
 164   BAT_QTYS(_,,,)
 165
 166
 167 #define F_VAR(f,...) \
 168 static value this_##f;
 169 ALL_VARS(F_VAR)
 170
 171 #define Q_FLD(f,t,l)        { "POWER_SUPPLY_" #l, &this_##f },
 172 #define E_FLD(f,t,l,vl...)  { "POWER_SUPPLY_" #l, &this_##f, { vl } },
 173
 174 static const batinfo_field uevent_fields[]= {
 175   UEVENT_ESSENTIAL_QUANTITY_FIELDS(Q_FLD)
 176   UEVENT_FUNKY_QUANTITY_FIELDS(Q_FLD)
 177   UEVENT_OPTIONAL_QUANTITY_FIELDS(Q_FLD)
 178   UEVENT_ENUM_FIELDS(E_FLD)
 179   { 0 }
 180 };
 181
 182 #define S_FLD(f,t,fn,vl...)                                             \
 183 static const batinfo_field bif_##f = { 0, &this_##f, { vl } };
 184   SEPARATE_QUANTITY_FIELDS(S_FLD)
 185
 186 #define S_FILE(f,t,fn,vl...) { fn, parse_separate, &bif_##f },
 187
 188 static const fileinfo files[]= {
 189   { "uevent",  parse_uevent,  uevent_fields },
 190   SEPARATE_QUANTITY_FIELDS(S_FILE)
 191   { 0 }
 192 };
 193
 194 /*---------- parsing of one thingx in /sys/class/power/... ----------*/
 195
 196 /* variables private to the parser and its error handlers */
 197 static char batlinebuf[1000];
 198 static FILE *batfile;
 199 static const char *batdirname;
 200 static const char *batfilename;
 201 static const char *batlinevalue;
 202
 203 static int batfailf(const char *why) {
 204   if (batlinevalue) {
 205     fprintf(stderr,"%s/%s: %s value `%s': %s\n",
 206             batdirname,batfilename, batlinebuf,batlinevalue,why);
 207   } else {
 208     fprintf(stderr,"%s/%s: %s: `%s'\n",
 209             batdirname,batfilename, why, batlinebuf);
 210   }
 211   return -1;
 212 }
 213
 214 static int batfailc(const char *why) {
 215   fprintf(stderr,"%s/%s: %s\n",
 216           batdirname,batfilename, why);
 217   return -1;
 218 }
 219
 220 static int batfaile(const char *syscall, const char *target) {
 221   fprintf(stderr,"%s: failed to %s %s: %s\n",
 222           batdirname ? batdirname : "*", syscall, target, strerror(errno));
 223   return -1;
 224 }
 225
 226 static int chdir_base(void) {
 227   int r;
 228
 229   r= chdir("/sys/class/power_supply");
 230   if (r) return batfaile("chdir","/sys/class/power_supply");
 231
 232   return 0;
 233 }
 234
 235 static void tidybattery(void) {
 236   if (batfile) { fclose(batfile); batfile=0; }
 237 }
 238
 239 static int parse_value(const fileinfo *cfile, const batinfo_field *field) {
 240   if (*field->valuep != VAL_NOTFOUND)
 241     return batfailf("value specified multiple times");
 242
 243   if (!field->enumarray[0]) {
 244
 245     char *ep;
 246     *field->valuep= strtoull(batlinevalue,&ep,10);
 247     if (*ep)
 248       batfailf("value number syntax incorrect");
 249
 250   } else {
 251
 252     const char *const *enumsearch;
 253     for (*field->valuep=0, enumsearch=field->enumarray;
 254          *enumsearch && strcmp(*enumsearch,batlinevalue);
 255          (*field->valuep)++, enumsearch++);
 256     if (!*enumsearch)
 257       batfailf("unknown enum value");
 258
 259   }
 260   return 0;
 261 }
 262
 263 static int parse_uevent(const fileinfo *cfile) {
 264   char *equals= strchr(batlinebuf,'=');
 265   if (!equals)
 266     return batfailf("line without a equals");
 267   *equals= 0;
 268   batlinevalue = equals+1;
 269
 270   const batinfo_field *field;
 271   for (field=cfile->extra; field->label; field++) {
 272     if (!strcmp(field->label,batlinebuf))
 273       goto found;
 274   }
 275   return 0;
 276
 277  found:
 278   return parse_value(cfile, field);
 279 }
 280
 281 static int readbattery(void) { /* 0=>ok, -1=>couldn't */
 282
 283   const fileinfo *cfile;
 284   char *sr;
 285   int r, l;
 286
 287   r= chdir_base();
 288   if (r) return r;
 289
 290   r= chdir(batdirname);
 291   if (r) return batfaile("chdir",batdirname);
 292
 293 #define V_NOTFOUND(f,...) \
 294   this_##f = VAL_NOTFOUND;
 295 ALL_VARS(V_NOTFOUND)
 296
 297   for (cfile=files;
 298        (batfilename= cfile->filename);
 299        cfile++) {
 300     batfile= fopen(batfilename,"r");
 301     if (!batfile) {
 302       if (errno == ENOENT) continue;
 303       return batfaile("open",batfilename);
 304     }
 305
 306     for (;;) {
 307       batlinevalue= 0;
 308
 309       sr= fgets(batlinebuf,sizeof(batlinebuf),batfile);
 310       if (ferror(batfile)) return batfaile("read",batfilename);
 311       if (!sr && feof(batfile)) break;
 312       l= strlen(batlinebuf);
 313       assert(l>0);
 314       if (batlinebuf[l-1] != '\n')
 315         return batfailf("line too long");
 316       batlinebuf[l-1]= 0;
 317
 318       if (cfile->parse(cfile))
 319         return -1;
 320     }
 321
 322     fclose(batfile);
 323     batfile= 0;
 324   }
 325
 326   if (debug) {
 327     printf("%s:\n",batdirname);
 328 #define V_PRINT(f,...)                                  \
 329     printf(" %-30s = %20"PRId64"\n", #f, (int64_t)this_##f);
 330 ALL_DIRECT_VARS(V_PRINT)
 331   }
 332
 333   int needsfields_MAINS   = this_type == TYPE_MAINS;
 334   int needsfields_BATTERY = this_type == TYPE_BATTERY;
 335   int needsfields_BOTH    = 1;
 336
 337   int missing = 0;
 338
 339 #define V_NEEDED(f,t,...)                               \
 340   if (needsfields_##t && this_##f == VAL_NOTFOUND) {    \
 341     fprintf(stderr,"%s: %s: not found\n",               \
 342             batdirname, #f);                            \
 343     missing++;                                          \
 344   }
 345 ALL_NEEDED_FIELDS(V_NEEDED)
 346
 347   if (missing) return -1;
 348
 349   return 0;
 350 }
 351
 352 /*---------- data collection and analysis ----------*/
 353
 354 /* These next three variables are the results of the charging state */
 355 static unsigned charging_mask; /* 1u<<CHGST_* | ... */
 356 static double nondegraded_norm, fill_norm, ratepersec_norm;
 357 static int alarm_level; /* 0=ok, 1=low */
 358
 359 #define Q_VAR(f,t,...) \
 360 static double total_##f;
 361   ALL_ACCUMULATE_FIELDS(Q_VAR)
 362
 363 static void acquiredata(void) {
 364   DIR *di;
 365   struct dirent *de;
 366   int r;
 367
 368   charging_mask= 0;
 369
 370 #define Q_ZERO(f,t,...) \
 371   total_##f= 0;
 372 ALL_ACCUMULATE_FIELDS(Q_ZERO)
 373
 374   r = chdir_base();
 375   if (r) goto bad;
 376
 377   di= opendir(".");  if (!di) { batfaile("opendir","battery"); goto bad; }
 378   while ((de= readdir(di))) {
 379     if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
 380
 381     batdirname= de->d_name;
 382     r= readbattery();
 383     tidybattery();
 384
 385     if (r) {
 386     bad:
 387       charging_mask |= (1u << CHGST_ERROR);
 388       break;
 389     }
 390
 391     if (this_type == TYPE_BATTERY) {
 392       if (!this_present)
 393         continue;
 394
 395       charging_mask |= 1u << this_state;
 396
 397 #define QTY_SUPPLIED(f,...)   this_##f != VAL_NOTFOUND &&
 398 #define QTY_USE_ENERGY(f,...) this_##f = this_##f##_energy;
 399 #define QTY_USE_CHARGE(f,...) this_##f = this_##f##_charge;
 400
 401       double funky_multiplier;
 402       if (BAT_QTYS(QTY_SUPPLIED,_energy,,) 1) {
 403         if (debug) printf(" using energy\n");
 404         BAT_QTYS(QTY_USE_ENERGY,,,);
 405         funky_multiplier = 1.0;
 406       } else if (BAT_QTYS(QTY_SUPPLIED,_charge,,)
 407                  this_voltage != VAL_NOTFOUND) {
 408         if (debug) printf(" using charge\n");
 409         BAT_QTYS(QTY_USE_CHARGE,,,);
 410         funky_multiplier = this_voltage * 1e-6;
 411       } else {
 412         batfailc("neither complete set of energy nor charge");
 413         continue;
 414       }
 415       if (this_state == CHGST_DISCHARGING)
 416         /* negate it */
 417         total_present_rate -= 2.0 * this_present_rate * funky_multiplier;
 418
 419 #define Q_ACCUMULATE_FUNKY(f,...)                       \
 420       total_##f += this_##f * funky_multiplier;
 421 BAT_QTYS(Q_ACCUMULATE_FUNKY,,,)
 422     }
 423
 424 #define Q_ACCUMULATE_PLAIN(f,t,...)                     \
 425     if (this_type == TYPE_##t)                  \
 426       total_##f += this_##f;
 427 ALL_PLAIN_ACCUMULATE_FIELDS(Q_ACCUMULATE_PLAIN)
 428
 429
 430   }
 431   closedir(di);
 432
 433   printf("TOTAL:\n");
 434 #define T_PRINT(f,...)                                  \
 435     printf(" %-30s = %20.6f\n", #f, total_##f);
 436 BAT_QTYS(T_PRINT,,,)
 437 ALL_PLAIN_ACCUMULATE_FIELDS(T_PRINT)
 438
 439   if (total_design_capacity < 0.5)
 440     total_design_capacity= 1.0;
 441
 442   if (total_last_full_capacity < total_remaining_capacity)
 443     total_last_full_capacity= total_remaining_capacity;
 444   if (total_design_capacity < total_last_full_capacity)
 445     total_design_capacity= total_last_full_capacity;
 446
 447   alarm_level= total_alarm && (charging_mask & 1u << CHGST_DISCHARGING);
 448
 449   nondegraded_norm= total_last_full_capacity / total_design_capacity;
 450   fill_norm= total_remaining_capacity / total_design_capacity;
 451   ratepersec_norm=  total_present_rate
 452     / (3600.0 * total_design_capacity);
 453 }
 454
 455 static void initacquire(void) {
 456 }
 457
 458 /*---------- argument parsing ----------*/
 459
 460 #define COLOURS                                 \
 461   C(blue,      discharging)                     \
 462   C(green,     charging)                        \
 463   C(cyan,      charged)                         \
 464   C(darkcyan,  notcharging)                     \
 465   C(grey,      confusing)                       \
 466   C(black,     normal)                          \
 467   C(red,       low)                             \
 468   C(dimgrey,   degraded)                        \
 469   C(darkgreen, absent)                          \
 470   C(yellow,    error)                           \
 471   C(white,     equilibrium)                     \
 472   GC(remain)                                    \
 473   GC(white)                                     \
 474   GC(empty)
 475
 476 static XrmDatabase xrm;
 477 static Display *disp;
 478 static int screen;
 479
 480 static const char defaultresources[]=
 481 #define GC(g)
 482 #define C(c,u)                                  \
 483   "*" #u "Color: " #c "\n"
 484   COLOURS
 485 #undef GC
 486 #undef C
 487   ;
 488
 489 #define S(s) ((char*)(s))
 490 static const XrmOptionDescRec optiontable[]= {
 491   { S("-debug"),        S("*debug"),        XrmoptionIsArg },
 492   { S("-display"),      S("*display"),      XrmoptionSepArg },
 493   { S("-geometry"),     S("*geometry"),     XrmoptionSepArg },
 494 #define GC(g)
 495 #define C(c,u)                                                  \
 496   { S("-" #u "Color"),  S("*" #u "Color"),  XrmoptionSepArg },  \
 497   { S("-" #u "Colour"), S("*" #u "Color"),  XrmoptionSepArg },
 498   COLOURS
 499 #undef GC
 500 #undef C
 501 };
 502
 503 static const char *getresource(const char *want) {
 504   char name_buf[256], class_buf[256];
 505   XrmValue val;
 506   char *rep_type_dummy;
 507   int r;
 508
 509   assert(strlen(want) < 128);
 510   sprintf(name_buf,"xacpi-simple.%s",want);
 511   sprintf(class_buf,"Xacpi-Simple.%s",want);
 512
 513   r= XrmGetResource(xrm, name_buf,class_buf, &rep_type_dummy, &val);
 514   if (!r) return 0;
 515
 516   return val.addr;
 517 }
 518
 519 static void more_resources(const char *str, const char *why) {
 520   XrmDatabase more;
 521
 522   if (!str) return;
 523
 524   more= XrmGetStringDatabase((char*)str);
 525   if (!more) fail(why);
 526   XrmCombineDatabase(more,&xrm,0);
 527 }
 528
 529 static void parseargs(int argc, char **argv) {
 530   Screen *screenscreen;
 531
 532   XrmInitialize();
 533
 534   XrmParseCommand(&xrm, (XrmOptionDescRec*)optiontable,
 535                   sizeof(optiontable)/sizeof(*optiontable),
 536                   program_name, &argc, argv);
 537
 538   if (argc>1) badusage();
 539
 540   debug= !!getresource("debug");
 541
 542   disp= XOpenDisplay(getresource("display"));
 543   if (!disp) fail("could not open display");
 544
 545   screen= DefaultScreen(disp);
 546
 547   screenscreen= ScreenOfDisplay(disp,screen);
 548   if (!screenscreen) fail("screenofdisplay");
 549   more_resources(XScreenResourceString(screenscreen), "screen resources");
 550   more_resources(XResourceManagerString(disp), "display resources");
 551   more_resources(defaultresources, "default resources");
 552 }
 553
 554 /*---------- display ----------*/
 555
 556 static Window win;
 557 static int width, height;
 558 static Colormap cmap;
 559 static unsigned long lastbackground;
 560
 561 typedef struct {
 562   GC gc;
 563   unsigned long lastfg;
 564 } Gcstate;
 565
 566 #define C(c,u) static unsigned long pix_##c;
 567 #define GC(g) static Gcstate gc_##g;
 568   COLOURS
 569 #undef C
 570 #undef GC
 571
 572 static void refresh(void);
 573
 574 #define CHGMASK_CHG_DIS ((1u<<CHGST_CHARGING) | (1u<<CHGST_DISCHARGING))
 575
 576 static void failr(const char *m, int r) {
 577   fprintf(stderr,"error: %s (code %d)\n", m, r);
 578   exit(-1);
 579 }
 580
 581 static void setbackground(unsigned long newbg) {
 582   int r;
 583
 584   if (newbg == lastbackground) return;
 585   r= XSetWindowBackground(disp,win,newbg);
 586   if (!r) fail("XSetWindowBackground");
 587   lastbackground= newbg;
 588 }
 589
 590 static void setforeground(Gcstate *g, unsigned long px) {
 591   XGCValues gcv;
 592   int r;
 593
 594   if (g->lastfg == px) return;
 595
 596   memset(&gcv,0,sizeof(gcv));
 597   g->lastfg= gcv.foreground= px;
 598   r= XChangeGC(disp,g->gc,GCForeground,&gcv);
 599   if (!r) fail("XChangeGC");
 600 }
 601
 602 static void show_solid(unsigned long px) {
 603   setbackground(px);
 604   XClearWindow(disp,win);
 605 }
 606
 607 static void show(void) {
 608   double elap, then;
 609   int i, leftmost_lit, leftmost_nondeg, beyond, first_beyond;
 610
 611   if (!charging_mask)
 612     return show_solid(pix_darkgreen);
 613
 614   if (charging_mask & (1u << CHGST_ERROR))
 615     return show_solid(pix_yellow);
 616
 617   setbackground(pix_dimgrey);
 618   XClearWindow(disp,win);
 619
 620   setforeground(&gc_remain,
 621                 !(charging_mask & CHGMASK_CHG_DIS) ?
 622                 (~charging_mask & (1u << CHGST_CHARGED) ?
 623                  pix_darkcyan : pix_cyan) :
 624                 !(~charging_mask & CHGMASK_CHG_DIS) ? pix_grey :
 625                 charging_mask & (1u<<CHGST_CHARGING)
 626                 ? pix_green : pix_blue);
 627
 628   setforeground(&gc_empty, alarm_level ? pix_red : pix_black);
 629
 630   for (i=0, first_beyond=1; i<height; i++) {
 631     elap= !i ? 0 :
 632       height==2 ? BOTTOM :
 633       TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
 634
 635     then= fill_norm + ratepersec_norm * elap;
 636
 637     beyond=
 638       ((charging_mask & (1u<<CHGST_DISCHARGING) && then <= 0.0) ||
 639        (charging_mask & (1u<<CHGST_CHARGING) && then>=nondegraded_norm));
 640
 641     if (then <= 0.0) then= 0.0;
 642     else if (then >= nondegraded_norm) then= nondegraded_norm;
 643
 644     leftmost_lit= width * then;
 645     leftmost_nondeg= width * nondegraded_norm;
 646
 647     if (beyond && first_beyond) {
 648       XDrawLine(disp, win, gc_white.gc, 0,i, leftmost_nondeg,i);
 649       first_beyond= 0;
 650     } else {
 651       if (leftmost_lit < leftmost_nondeg)
 652         XDrawLine(disp, win, gc_empty.gc,
 653                   leftmost_lit,i, leftmost_nondeg,i);
 654       if (leftmost_lit >= 0)
 655         XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
 656     }
 657   }
 658 }
 659
 660 static void initgc(Gcstate *gc_r) {
 661   XGCValues gcv;
 662
 663   memset(&gcv,0,sizeof(gcv));
 664   gcv.function= GXcopy;
 665   gcv.line_width= 1;
 666   gc_r->lastfg= gcv.foreground= pix_white;
 667   gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
 668 }
 669
 670 static void colour(unsigned long *pix_r, const char *whichcolour) {
 671   XColor xc;
 672   const char *name;
 673   Status st;
 674
 675   name= getresource(whichcolour);
 676   if (!name) fail("get colour resource");
 677
 678   st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
 679   if (!st) fail(name);
 680
 681   *pix_r= xc.pixel;
 682 }
 683
 684 static void initgraphics(int argc, char **argv) {
 685   int xwmgr, r;
 686   const char *geom_string;
 687   XSizeHints *normal_hints;
 688   XWMHints *wm_hints;
 689   XClassHint *class_hint;
 690   int pos_x, pos_y, gravity;
 691   char *program_name_silly;
 692
 693   program_name_silly= (char*)program_name;
 694
 695   normal_hints= XAllocSizeHints();
 696   wm_hints= XAllocWMHints();
 697   class_hint= XAllocClassHint();
 698
 699   if (!normal_hints || !wm_hints || !class_hint)
 700     fail("could not alloc hint(s)");
 701
 702   geom_string= getresource("geometry");
 703
 704   xwmgr= XWMGeometry(disp,screen, geom_string,"128x32", 0,
 705                  normal_hints,
 706                  &pos_x, &pos_y,
 707                  &width, &height,
 708                  &gravity);
 709
 710   win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),
 711                            pos_x,pos_y,width,height,0,0,0);
 712   cmap= DefaultColormap(disp,screen);
 713
 714 #define C(c,u) colour(&pix_##c, #u "Color");
 715 #define GC(g) initgc(&gc_##g);
 716   COLOURS
 717 #undef C
 718 #undef GC
 719
 720   r= XSetWindowBackground(disp,win,pix_dimgrey);
 721   if (!r) fail("init set background");
 722   lastbackground= pix_dimgrey;
 723
 724   normal_hints->flags= PWinGravity;
 725   normal_hints->win_gravity= gravity;
 726   normal_hints->x= pos_x;
 727   normal_hints->y= pos_y;
 728   normal_hints->width= width;
 729   normal_hints->height= height;
 730   if ((xwmgr & XValue) || (xwmgr & YValue))
 731     normal_hints->flags |= USPosition;
 732
 733   wm_hints->flags= InputHint;
 734   wm_hints->input= False;
 735
 736   class_hint->res_name= program_name_silly;
 737   class_hint->res_class= program_name_silly;
 738
 739   XmbSetWMProperties(disp,win, program_name,program_name,
 740                      argv,argc, normal_hints, wm_hints, class_hint);
 741
 742   XSelectInput(disp,win, ExposureMask|StructureNotifyMask);
 743   XMapWindow(disp,win);
 744 }
 745
 746 static void refresh(void) {
 747   acquiredata();
 748   show();
 749 }
 750
 751 static void newgeometry(void) {
 752   int dummy;
 753   unsigned int udummy, gotwidth, gotheight;
 754   Window dummyw;
 755
 756   XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &gotwidth,&gotheight,
 757                &udummy,&udummy);
 758   assert(gotwidth < INT_MAX);
 759   assert(gotheight < INT_MAX);
 760   width = gotwidth;
 761   height = gotheight;
 762 }
 763
 764 static void eventloop(void) {
 765   XEvent ev;
 766   struct pollfd pfd;
 767   int r, timeout;
 768
 769   newgeometry();
 770   refresh();
 771
 772   for (;;) {
 773     XFlush(disp);
 774
 775     pfd.fd= ConnectionNumber(disp);
 776     pfd.events= POLLIN|POLLERR;
 777
 778     timeout= !(charging_mask & (1u << CHGST_ERROR)) ? TIMEOUT : TIMEOUT_ONERROR;
 779     r= poll(&pfd,1,timeout);
 780     if (r==-1 && errno!=EINTR) failr("poll",errno);
 781
 782     while (XPending(disp)) {
 783       XNextEvent(disp,&ev);
 784       if (ev.type == ConfigureNotify) {
 785         XConfigureEvent *ce= (void*)&ev;
 786         width= ce->width;
 787         height= ce->height;
 788       }
 789     }
 790     refresh();
 791   }
 792 }
 793
 794 int main(int argc, char **argv) {
 795   parseargs(argc,argv);
 796   initacquire();
 797   initgraphics(argc,argv);
 798   eventloop();
 799   return 0;
 800 }