src/mesa/drivers/dri/common/xmlconfig.c

   1 /*
   2  * XML DRI client-side driver configuration
   3  * Copyright (C) 2003 Felix Kuehling
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * FELIX KUEHLING, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  21  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24 /**
  25  * \file xmlconfig.c
  26  * \brief Driver-independent client-side part of the XML configuration
  27  * \author Felix Kuehling
  28  */
  29
  30 #include <string.h>
  31 #include <assert.h>
  32 #include <expat.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35 #include <errno.h>
  36 #include "main/imports.h"
  37 #include "utils.h"
  38 #include "xmlconfig.h"
  39
  40 #undef GET_PROGRAM_NAME
  41
  42 #if (defined(__GNU_LIBRARY__) || defined(__GLIBC__)) && !defined(__UCLIBC__)
  43 #    if !defined(__GLIBC__) || (__GLIBC__ < 2)
  44 /* These aren't declared in any libc5 header */
  45 extern char *program_invocation_name, *program_invocation_short_name;
  46 #    endif
  47 #    define GET_PROGRAM_NAME() program_invocation_short_name
  48 #elif defined(__CYGWIN__)
  49 #    define GET_PROGRAM_NAME() program_invocation_short_name
  50 #elif defined(__FreeBSD__) && (__FreeBSD__ >= 2)
  51 #    include <osreldate.h>
  52 #    if (__FreeBSD_version >= 440000)
  53 #        include <stdlib.h>
  54 #        define GET_PROGRAM_NAME() getprogname()
  55 #    endif
  56 #elif defined(__NetBSD__) && defined(__NetBSD_Version) && (__NetBSD_Version >= 106000100)
  57 #    include <stdlib.h>
  58 #    define GET_PROGRAM_NAME() getprogname()
  59 #elif defined(__APPLE__)
  60 #    include <stdlib.h>
  61 #    define GET_PROGRAM_NAME() getprogname()
  62 #elif defined(__sun)
  63 /* Solaris has getexecname() which returns the full path - return just
  64    the basename to match BSD getprogname() */
  65 #    include <stdlib.h>
  66 #    include <libgen.h>
  67
  68 static const char *__getProgramName () {
  69     static const char *progname;
  70
  71     if (progname == NULL) {
  72         const char *e = getexecname();
  73         if (e != NULL) {
  74             /* Have to make a copy since getexecname can return a readonly
  75                string, but basename expects to be able to modify its arg. */
  76             char *n = strdup(e);
  77             if (n != NULL) {
  78                 progname = basename(n);
  79             }
  80         }
  81     }
  82     return progname;
  83 }
  84
  85 #    define GET_PROGRAM_NAME() __getProgramName()
  86 #endif
  87
  88 #if !defined(GET_PROGRAM_NAME)
  89 #    if defined(__OpenBSD__) || defined(NetBSD) || defined(__UCLIBC__) || defined(ANDROID)
  90 /* This is a hack. It's said to work on OpenBSD, NetBSD and GNU.
  91  * Rogelio M.Serrano Jr. reported it's also working with UCLIBC. It's
  92  * used as a last resort, if there is no documented facility available. */
  93 static const char *__getProgramName () {
  94     extern const char *__progname;
  95     char * arg = strrchr(__progname, '/');
  96     if (arg)
  97         return arg+1;
  98     else
  99         return __progname;
 100 }
 101 #        define GET_PROGRAM_NAME() __getProgramName()
 102 #    else
 103 #        define GET_PROGRAM_NAME() ""
 104 #        warning "Per application configuration won't work with your OS version."
 105 #    endif
 106 #endif
 107
 108 /** \brief Find an option in an option cache with the name as key */
 109 static uint32_t findOption (const driOptionCache *cache, const char *name) {
 110     uint32_t len = strlen (name);
 111     uint32_t size = 1 << cache->tableSize, mask = size - 1;
 112     uint32_t hash = 0;
 113     uint32_t i, shift;
 114
 115   /* compute a hash from the variable length name */
 116     for (i = 0, shift = 0; i < len; ++i, shift = (shift+8) & 31)
 117         hash += (uint32_t)name[i] << shift;
 118     hash *= hash;
 119     hash = (hash >> (16-cache->tableSize/2)) & mask;
 120
 121   /* this is just the starting point of the linear search for the option */
 122     for (i = 0; i < size; ++i, hash = (hash+1) & mask) {
 123       /* if we hit an empty entry then the option is not defined (yet) */
 124         if (cache->info[hash].name == 0)
 125             break;
 126         else if (!strcmp (name, cache->info[hash].name))
 127             break;
 128     }
 129   /* this assertion fails if the hash table is full */
 130     assert (i < size);
 131
 132     return hash;
 133 }
 134
 135 /** \brief Like strdup but using malloc and with error checking. */
 136 #define XSTRDUP(dest,source) do { \
 137     uint32_t len = strlen (source); \
 138     if (!(dest = malloc(len+1))) { \
 139         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__); \
 140         abort(); \
 141     } \
 142     memcpy (dest, source, len+1); \
 143 } while (0)
 144
 145 static int compare (const void *a, const void *b) {
 146     return strcmp (*(char *const*)a, *(char *const*)b);
 147 }
 148 /** \brief Binary search in a string array. */
 149 static uint32_t bsearchStr (const XML_Char *name,
 150                           const XML_Char *elems[], uint32_t count) {
 151     const XML_Char **found;
 152     found = bsearch (&name, elems, count, sizeof (XML_Char *), compare);
 153     if (found)
 154         return found - elems;
 155     else
 156         return count;
 157 }
 158
 159 /** \brief Locale-independent integer parser.
 160  *
 161  * Works similar to strtol. Leading space is NOT skipped. The input
 162  * number may have an optional sign. Radix is specified by base. If
 163  * base is 0 then decimal is assumed unless the input number is
 164  * prefixed by 0x or 0X for hexadecimal or 0 for octal. After
 165  * returning tail points to the first character that is not part of
 166  * the integer number. If no number was found then tail points to the
 167  * start of the input string. */
 168 static int strToI (const XML_Char *string, const XML_Char **tail, int base) {
 169     int radix = base == 0 ? 10 : base;
 170     int result = 0;
 171     int sign = 1;
 172     bool numberFound = false;
 173     const XML_Char *start = string;
 174
 175     assert (radix >= 2 && radix <= 36);
 176
 177     if (*string == '-') {
 178         sign = -1;
 179         string++;
 180     } else if (*string == '+')
 181         string++;
 182     if (base == 0 && *string == '0') {
 183         numberFound = true;
 184         if (*(string+1) == 'x' || *(string+1) == 'X') {
 185             radix = 16;
 186             string += 2;
 187         } else {
 188             radix = 8;
 189             string++;
 190         }
 191     }
 192     do {
 193         int digit = -1;
 194         if (radix <= 10) {
 195             if (*string >= '0' && *string < '0' + radix)
 196                 digit = *string - '0';
 197         } else {
 198             if (*string >= '0' && *string <= '9')
 199                 digit = *string - '0';
 200             else if (*string >= 'a' && *string < 'a' + radix - 10)
 201                 digit = *string - 'a' + 10;
 202             else if (*string >= 'A' && *string < 'A' + radix - 10)
 203                 digit = *string - 'A' + 10;
 204         }
 205         if (digit != -1) {
 206             numberFound = true;
 207             result = radix*result + digit;
 208             string++;
 209         } else
 210             break;
 211     } while (true);
 212     *tail = numberFound ? string : start;
 213     return sign * result;
 214 }
 215
 216 /** \brief Locale-independent floating-point parser.
 217  *
 218  * Works similar to strtod. Leading space is NOT skipped. The input
 219  * number may have an optional sign. '.' is interpreted as decimal
 220  * point and may occur at most once. Optionally the number may end in
 221  * [eE]<exponent>, where <exponent> is an integer as recognized by
 222  * strToI. In that case the result is number * 10^exponent. After
 223  * returning tail points to the first character that is not part of
 224  * the floating point number. If no number was found then tail points
 225  * to the start of the input string.
 226  *
 227  * Uses two passes for maximum accuracy. */
 228 static float strToF (const XML_Char *string, const XML_Char **tail) {
 229     int nDigits = 0, pointPos, exponent;
 230     float sign = 1.0f, result = 0.0f, scale;
 231     const XML_Char *start = string, *numStart;
 232
 233     /* sign */
 234     if (*string == '-') {
 235         sign = -1.0f;
 236         string++;
 237     } else if (*string == '+')
 238         string++;
 239
 240     /* first pass: determine position of decimal point, number of
 241      * digits, exponent and the end of the number. */
 242     numStart = string;
 243     while (*string >= '0' && *string <= '9') {
 244         string++;
 245         nDigits++;
 246     }
 247     pointPos = nDigits;
 248     if (*string == '.') {
 249         string++;
 250         while (*string >= '0' && *string <= '9') {
 251             string++;
 252             nDigits++;
 253         }
 254     }
 255     if (nDigits == 0) {
 256         /* no digits, no number */
 257         *tail = start;
 258         return 0.0f;
 259     }
 260     *tail = string;
 261     if (*string == 'e' || *string == 'E') {
 262         const XML_Char *expTail;
 263         exponent = strToI (string+1, &expTail, 10);
 264         if (expTail == string+1)
 265             exponent = 0;
 266         else
 267             *tail = expTail;
 268     } else
 269         exponent = 0;
 270     string = numStart;
 271
 272     /* scale of the first digit */
 273     scale = sign * (float)pow (10.0, (double)(pointPos-1 + exponent));
 274
 275     /* second pass: parse digits */
 276     do {
 277         if (*string != '.') {
 278             assert (*string >= '0' && *string <= '9');
 279             result += scale * (float)(*string - '0');
 280             scale *= 0.1f;
 281             nDigits--;
 282         }
 283         string++;
 284     } while (nDigits > 0);
 285
 286     return result;
 287 }
 288
 289 /** \brief Parse a value of a given type. */
 290 static unsigned char parseValue (driOptionValue *v, driOptionType type,
 291                              const XML_Char *string) {
 292     const XML_Char *tail = NULL;
 293   /* skip leading white-space */
 294     string += strspn (string, " \f\n\r\t\v");
 295     switch (type) {
 296       case DRI_BOOL:
 297         if (!strcmp (string, "false")) {
 298             v->_bool = false;
 299             tail = string + 5;
 300         } else if (!strcmp (string, "true")) {
 301             v->_bool = true;
 302             tail = string + 4;
 303         }
 304         else
 305             return false;
 306         break;
 307       case DRI_ENUM: /* enum is just a special integer */
 308       case DRI_INT:
 309         v->_int = strToI (string, &tail, 0);
 310         break;
 311       case DRI_FLOAT:
 312         v->_float = strToF (string, &tail);
 313         break;
 314       case DRI_STRING:
 315         free (v->_string);
 316         v->_string = strndup(string, STRING_CONF_MAXLEN);
 317         return GL_TRUE;
 318     }
 319
 320     if (tail == string)
 321         return false; /* empty string (or containing only white-space) */
 322   /* skip trailing white space */
 323     if (*tail)
 324         tail += strspn (tail, " \f\n\r\t\v");
 325     if (*tail)
 326         return false; /* something left over that is not part of value */
 327
 328     return true;
 329 }
 330
 331 /** \brief Parse a list of ranges of type info->type. */
 332 static unsigned char parseRanges (driOptionInfo *info, const XML_Char *string) {
 333     XML_Char *cp, *range;
 334     uint32_t nRanges, i;
 335     driOptionRange *ranges;
 336
 337     XSTRDUP (cp, string);
 338   /* pass 1: determine the number of ranges (number of commas + 1) */
 339     range = cp;
 340     for (nRanges = 1; *range; ++range)
 341         if (*range == ',')
 342             ++nRanges;
 343
 344     if ((ranges = malloc(nRanges*sizeof(driOptionRange))) == NULL) {
 345         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 346         abort();
 347     }
 348
 349   /* pass 2: parse all ranges into preallocated array */
 350     range = cp;
 351     for (i = 0; i < nRanges; ++i) {
 352         XML_Char *end, *sep;
 353         assert (range);
 354         end = strchr (range, ',');
 355         if (end)
 356             *end = '\0';
 357         sep = strchr (range, ':');
 358         if (sep) { /* non-empty interval */
 359             *sep = '\0';
 360             if (!parseValue (&ranges[i].start, info->type, range) ||
 361                 !parseValue (&ranges[i].end, info->type, sep+1))
 362                 break;
 363             if (info->type == DRI_INT &&
 364                 ranges[i].start._int > ranges[i].end._int)
 365                 break;
 366             if (info->type == DRI_FLOAT &&
 367                 ranges[i].start._float > ranges[i].end._float)
 368                 break;
 369         } else { /* empty interval */
 370             if (!parseValue (&ranges[i].start, info->type, range))
 371                 break;
 372             ranges[i].end = ranges[i].start;
 373         }
 374         if (end)
 375             range = end+1;
 376         else
 377             range = NULL;
 378     }
 379     free(cp);
 380     if (i < nRanges) {
 381         free(ranges);
 382         return false;
 383     } else
 384         assert (range == NULL);
 385
 386     info->nRanges = nRanges;
 387     info->ranges = ranges;
 388     return true;
 389 }
 390
 391 /** \brief Check if a value is in one of info->ranges. */
 392 static bool checkValue (const driOptionValue *v, const driOptionInfo *info) {
 393     uint32_t i;
 394     assert (info->type != DRI_BOOL); /* should be caught by the parser */
 395     if (info->nRanges == 0)
 396         return true;
 397     switch (info->type) {
 398       case DRI_ENUM: /* enum is just a special integer */
 399       case DRI_INT:
 400         for (i = 0; i < info->nRanges; ++i)
 401             if (v->_int >= info->ranges[i].start._int &&
 402                 v->_int <= info->ranges[i].end._int)
 403                 return true;
 404         break;
 405       case DRI_FLOAT:
 406         for (i = 0; i < info->nRanges; ++i)
 407             if (v->_float >= info->ranges[i].start._float &&
 408                 v->_float <= info->ranges[i].end._float)
 409                 return true;
 410         break;
 411       case DRI_STRING:
 412         break;
 413       default:
 414         assert (0); /* should never happen */
 415     }
 416     return false;
 417 }
 418
 419 /**
 420  * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
 421  * is set.
 422  *
 423  * Is called from the drivers.
 424  *
 425  * \param f \c printf like format string.
 426  */
 427 static void
 428 __driUtilMessage(const char *f, ...)
 429 {
 430     va_list args;
 431     const char *libgl_debug;
 432
 433     libgl_debug=getenv("LIBGL_DEBUG");
 434     if (libgl_debug && !strstr(libgl_debug, "quiet")) {
 435         fprintf(stderr, "libGL: ");
 436         va_start(args, f);
 437         vfprintf(stderr, f, args);
 438         va_end(args);
 439         fprintf(stderr, "\n");
 440     }
 441 }
 442
 443 /** \brief Output a warning message. */
 444 #define XML_WARNING1(msg) do {\
 445     __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
 446                       (int) XML_GetCurrentLineNumber(data->parser), \
 447                       (int) XML_GetCurrentColumnNumber(data->parser)); \
 448 } while (0)
 449 #define XML_WARNING(msg,args...) do { \
 450     __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
 451                       (int) XML_GetCurrentLineNumber(data->parser), \
 452                       (int) XML_GetCurrentColumnNumber(data->parser), \
 453                       args); \
 454 } while (0)
 455 /** \brief Output an error message. */
 456 #define XML_ERROR1(msg) do { \
 457     __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
 458                       (int) XML_GetCurrentLineNumber(data->parser), \
 459                       (int) XML_GetCurrentColumnNumber(data->parser)); \
 460 } while (0)
 461 #define XML_ERROR(msg,args...) do { \
 462     __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
 463                       (int) XML_GetCurrentLineNumber(data->parser), \
 464                       (int) XML_GetCurrentColumnNumber(data->parser), \
 465                       args); \
 466 } while (0)
 467 /** \brief Output a fatal error message and abort. */
 468 #define XML_FATAL1(msg) do { \
 469     fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
 470              data->name, \
 471              (int) XML_GetCurrentLineNumber(data->parser),      \
 472              (int) XML_GetCurrentColumnNumber(data->parser)); \
 473     abort();\
 474 } while (0)
 475 #define XML_FATAL(msg,args...) do { \
 476     fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
 477              data->name, \
 478              (int) XML_GetCurrentLineNumber(data->parser),      \
 479              (int) XML_GetCurrentColumnNumber(data->parser),            \
 480              args); \
 481     abort();\
 482 } while (0)
 483
 484 /** \brief Parser context for __driConfigOptions. */
 485 struct OptInfoData {
 486     const char *name;
 487     XML_Parser parser;
 488     driOptionCache *cache;
 489     bool inDriInfo;
 490     bool inSection;
 491     bool inDesc;
 492     bool inOption;
 493     bool inEnum;
 494     int curOption;
 495 };
 496
 497 /** \brief Elements in __driConfigOptions. */
 498 enum OptInfoElem {
 499     OI_DESCRIPTION = 0, OI_DRIINFO, OI_ENUM, OI_OPTION, OI_SECTION, OI_COUNT
 500 };
 501 static const XML_Char *OptInfoElems[] = {
 502     "description", "driinfo", "enum", "option", "section"
 503 };
 504
 505 /** \brief Parse attributes of an enum element.
 506  *
 507  * We're not actually interested in the data. Just make sure this is ok
 508  * for external configuration tools.
 509  */
 510 static void parseEnumAttr (struct OptInfoData *data, const XML_Char **attr) {
 511     uint32_t i;
 512     const XML_Char *value = NULL, *text = NULL;
 513     driOptionValue v;
 514     uint32_t opt = data->curOption;
 515     for (i = 0; attr[i]; i += 2) {
 516         if (!strcmp (attr[i], "value")) value = attr[i+1];
 517         else if (!strcmp (attr[i], "text")) text = attr[i+1];
 518         else XML_FATAL("illegal enum attribute: %s.", attr[i]);
 519     }
 520     if (!value) XML_FATAL1 ("value attribute missing in enum.");
 521     if (!text) XML_FATAL1 ("text attribute missing in enum.");
 522      if (!parseValue (&v, data->cache->info[opt].type, value))
 523         XML_FATAL ("illegal enum value: %s.", value);
 524     if (!checkValue (&v, &data->cache->info[opt]))
 525         XML_FATAL ("enum value out of valid range: %s.", value);
 526 }
 527
 528 /** \brief Parse attributes of a description element.
 529  *
 530  * We're not actually interested in the data. Just make sure this is ok
 531  * for external configuration tools.
 532  */
 533 static void parseDescAttr (struct OptInfoData *data, const XML_Char **attr) {
 534     uint32_t i;
 535     const XML_Char *lang = NULL, *text = NULL;
 536     for (i = 0; attr[i]; i += 2) {
 537         if (!strcmp (attr[i], "lang")) lang = attr[i+1];
 538         else if (!strcmp (attr[i], "text")) text = attr[i+1];
 539         else XML_FATAL("illegal description attribute: %s.", attr[i]);
 540     }
 541     if (!lang) XML_FATAL1 ("lang attribute missing in description.");
 542     if (!text) XML_FATAL1 ("text attribute missing in description.");
 543 }
 544
 545 /** \brief Parse attributes of an option element. */
 546 static void parseOptInfoAttr (struct OptInfoData *data, const XML_Char **attr) {
 547     enum OptAttr {OA_DEFAULT = 0, OA_NAME, OA_TYPE, OA_VALID, OA_COUNT};
 548     static const XML_Char *optAttr[] = {"default", "name", "type", "valid"};
 549     const XML_Char *attrVal[OA_COUNT] = {NULL, NULL, NULL, NULL};
 550     const char *defaultVal;
 551     driOptionCache *cache = data->cache;
 552     uint32_t opt, i;
 553     for (i = 0; attr[i]; i += 2) {
 554         uint32_t attrName = bsearchStr (attr[i], optAttr, OA_COUNT);
 555         if (attrName >= OA_COUNT)
 556             XML_FATAL ("illegal option attribute: %s", attr[i]);
 557         attrVal[attrName] = attr[i+1];
 558     }
 559     if (!attrVal[OA_NAME]) XML_FATAL1 ("name attribute missing in option.");
 560     if (!attrVal[OA_TYPE]) XML_FATAL1 ("type attribute missing in option.");
 561     if (!attrVal[OA_DEFAULT]) XML_FATAL1 ("default attribute missing in option.");
 562
 563     opt = findOption (cache, attrVal[OA_NAME]);
 564     if (cache->info[opt].name)
 565         XML_FATAL ("option %s redefined.", attrVal[OA_NAME]);
 566     data->curOption = opt;
 567
 568     XSTRDUP (cache->info[opt].name, attrVal[OA_NAME]);
 569
 570     if (!strcmp (attrVal[OA_TYPE], "bool"))
 571         cache->info[opt].type = DRI_BOOL;
 572     else if (!strcmp (attrVal[OA_TYPE], "enum"))
 573         cache->info[opt].type = DRI_ENUM;
 574     else if (!strcmp (attrVal[OA_TYPE], "int"))
 575         cache->info[opt].type = DRI_INT;
 576     else if (!strcmp (attrVal[OA_TYPE], "float"))
 577         cache->info[opt].type = DRI_FLOAT;
 578     else if (!strcmp (attrVal[OA_TYPE], "string"))
 579         cache->info[opt].type = DRI_STRING;
 580     else
 581         XML_FATAL ("illegal type in option: %s.", attrVal[OA_TYPE]);
 582
 583     defaultVal = getenv (cache->info[opt].name);
 584     if (defaultVal != NULL) {
 585       /* don't use XML_WARNING, we want the user to see this! */
 586         fprintf (stderr,
 587                  "ATTENTION: default value of option %s overridden by environment.\n",
 588                  cache->info[opt].name);
 589     } else
 590         defaultVal = attrVal[OA_DEFAULT];
 591     if (!parseValue (&cache->values[opt], cache->info[opt].type, defaultVal))
 592         XML_FATAL ("illegal default value for %s: %s.", cache->info[opt].name, defaultVal);
 593
 594     if (attrVal[OA_VALID]) {
 595         if (cache->info[opt].type == DRI_BOOL)
 596             XML_FATAL1 ("boolean option with valid attribute.");
 597         if (!parseRanges (&cache->info[opt], attrVal[OA_VALID]))
 598             XML_FATAL ("illegal valid attribute: %s.", attrVal[OA_VALID]);
 599         if (!checkValue (&cache->values[opt], &cache->info[opt]))
 600             XML_FATAL ("default value out of valid range '%s': %s.",
 601                        attrVal[OA_VALID], defaultVal);
 602     } else if (cache->info[opt].type == DRI_ENUM) {
 603         XML_FATAL1 ("valid attribute missing in option (mandatory for enums).");
 604     } else {
 605         cache->info[opt].nRanges = 0;
 606         cache->info[opt].ranges = NULL;
 607     }
 608 }
 609
 610 /** \brief Handler for start element events. */
 611 static void optInfoStartElem (void *userData, const XML_Char *name,
 612                               const XML_Char **attr) {
 613     struct OptInfoData *data = (struct OptInfoData *)userData;
 614     enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
 615     switch (elem) {
 616       case OI_DRIINFO:
 617         if (data->inDriInfo)
 618             XML_FATAL1 ("nested <driinfo> elements.");
 619         if (attr[0])
 620             XML_FATAL1 ("attributes specified on <driinfo> element.");
 621         data->inDriInfo = true;
 622         break;
 623       case OI_SECTION:
 624         if (!data->inDriInfo)
 625             XML_FATAL1 ("<section> must be inside <driinfo>.");
 626         if (data->inSection)
 627             XML_FATAL1 ("nested <section> elements.");
 628         if (attr[0])
 629             XML_FATAL1 ("attributes specified on <section> element.");
 630         data->inSection = true;
 631         break;
 632       case OI_DESCRIPTION:
 633         if (!data->inSection && !data->inOption)
 634             XML_FATAL1 ("<description> must be inside <description> or <option.");
 635         if (data->inDesc)
 636             XML_FATAL1 ("nested <description> elements.");
 637         data->inDesc = true;
 638         parseDescAttr (data, attr);
 639         break;
 640       case OI_OPTION:
 641         if (!data->inSection)
 642             XML_FATAL1 ("<option> must be inside <section>.");
 643         if (data->inDesc)
 644             XML_FATAL1 ("<option> nested in <description> element.");
 645         if (data->inOption)
 646             XML_FATAL1 ("nested <option> elements.");
 647         data->inOption = true;
 648         parseOptInfoAttr (data, attr);
 649         break;
 650       case OI_ENUM:
 651         if (!(data->inOption && data->inDesc))
 652             XML_FATAL1 ("<enum> must be inside <option> and <description>.");
 653         if (data->inEnum)
 654             XML_FATAL1 ("nested <enum> elements.");
 655         data->inEnum = true;
 656         parseEnumAttr (data, attr);
 657         break;
 658       default:
 659         XML_FATAL ("unknown element: %s.", name);
 660     }
 661 }
 662
 663 /** \brief Handler for end element events. */
 664 static void optInfoEndElem (void *userData, const XML_Char *name) {
 665     struct OptInfoData *data = (struct OptInfoData *)userData;
 666     enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
 667     switch (elem) {
 668       case OI_DRIINFO:
 669         data->inDriInfo = false;
 670         break;
 671       case OI_SECTION:
 672         data->inSection = false;
 673         break;
 674       case OI_DESCRIPTION:
 675         data->inDesc = false;
 676         break;
 677       case OI_OPTION:
 678         data->inOption = false;
 679         break;
 680       case OI_ENUM:
 681         data->inEnum = false;
 682         break;
 683       default:
 684         assert (0); /* should have been caught by StartElem */
 685     }
 686 }
 687
 688 void driParseOptionInfo (driOptionCache *info, const char *configOptions) {
 689     XML_Parser p;
 690     int status;
 691     struct OptInfoData userData;
 692     struct OptInfoData *data = &userData;
 693
 694     /* Make the hash table big enough to fit more than the maximum number of
 695      * config options we've ever seen in a driver.
 696      */
 697     info->tableSize = 6;
 698     info->info = calloc(1 << info->tableSize, sizeof (driOptionInfo));
 699     info->values = calloc(1 << info->tableSize, sizeof (driOptionValue));
 700     if (info->info == NULL || info->values == NULL) {
 701         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 702         abort();
 703     }
 704
 705     p = XML_ParserCreate ("UTF-8"); /* always UTF-8 */
 706     XML_SetElementHandler (p, optInfoStartElem, optInfoEndElem);
 707     XML_SetUserData (p, data);
 708
 709     userData.name = "__driConfigOptions";
 710     userData.parser = p;
 711     userData.cache = info;
 712     userData.inDriInfo = false;
 713     userData.inSection = false;
 714     userData.inDesc = false;
 715     userData.inOption = false;
 716     userData.inEnum = false;
 717     userData.curOption = -1;
 718
 719     status = XML_Parse (p, configOptions, strlen (configOptions), 1);
 720     if (!status)
 721         XML_FATAL ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
 722
 723     XML_ParserFree (p);
 724 }
 725
 726 /** \brief Parser context for configuration files. */
 727 struct OptConfData {
 728     const char *name;
 729     XML_Parser parser;
 730     driOptionCache *cache;
 731     int screenNum;
 732     const char *driverName, *execName;
 733     uint32_t ignoringDevice;
 734     uint32_t ignoringApp;
 735     uint32_t inDriConf;
 736     uint32_t inDevice;
 737     uint32_t inApp;
 738     uint32_t inOption;
 739 };
 740
 741 /** \brief Elements in configuration files. */
 742 enum OptConfElem {
 743     OC_APPLICATION = 0, OC_DEVICE, OC_DRICONF, OC_OPTION, OC_COUNT
 744 };
 745 static const XML_Char *OptConfElems[] = {
 746     "application", "device", "driconf", "option"
 747 };
 748
 749 /** \brief Parse attributes of a device element. */
 750 static void parseDeviceAttr (struct OptConfData *data, const XML_Char **attr) {
 751     uint32_t i;
 752     const XML_Char *driver = NULL, *screen = NULL;
 753     for (i = 0; attr[i]; i += 2) {
 754         if (!strcmp (attr[i], "driver")) driver = attr[i+1];
 755         else if (!strcmp (attr[i], "screen")) screen = attr[i+1];
 756         else XML_WARNING("unknown device attribute: %s.", attr[i]);
 757     }
 758     if (driver && strcmp (driver, data->driverName))
 759         data->ignoringDevice = data->inDevice;
 760     else if (screen) {
 761         driOptionValue screenNum;
 762         if (!parseValue (&screenNum, DRI_INT, screen))
 763             XML_WARNING("illegal screen number: %s.", screen);
 764         else if (screenNum._int != data->screenNum)
 765             data->ignoringDevice = data->inDevice;
 766     }
 767 }
 768
 769 /** \brief Parse attributes of an application element. */
 770 static void parseAppAttr (struct OptConfData *data, const XML_Char **attr) {
 771     uint32_t i;
 772     const XML_Char *exec = NULL;
 773     for (i = 0; attr[i]; i += 2) {
 774         if (!strcmp (attr[i], "name")) /* not needed here */;
 775         else if (!strcmp (attr[i], "executable")) exec = attr[i+1];
 776         else XML_WARNING("unknown application attribute: %s.", attr[i]);
 777     }
 778     if (exec && strcmp (exec, data->execName))
 779         data->ignoringApp = data->inApp;
 780 }
 781
 782 /** \brief Parse attributes of an option element. */
 783 static void parseOptConfAttr (struct OptConfData *data, const XML_Char **attr) {
 784     uint32_t i;
 785     const XML_Char *name = NULL, *value = NULL;
 786     for (i = 0; attr[i]; i += 2) {
 787         if (!strcmp (attr[i], "name")) name = attr[i+1];
 788         else if (!strcmp (attr[i], "value")) value = attr[i+1];
 789         else XML_WARNING("unknown option attribute: %s.", attr[i]);
 790     }
 791     if (!name) XML_WARNING1 ("name attribute missing in option.");
 792     if (!value) XML_WARNING1 ("value attribute missing in option.");
 793     if (name && value) {
 794         driOptionCache *cache = data->cache;
 795         uint32_t opt = findOption (cache, name);
 796         if (cache->info[opt].name == NULL)
 797             /* don't use XML_WARNING, drirc defines options for all drivers,
 798              * but not all drivers support them */
 799             return;
 800         else if (getenv (cache->info[opt].name))
 801           /* don't use XML_WARNING, we want the user to see this! */
 802             fprintf (stderr, "ATTENTION: option value of option %s ignored.\n",
 803                      cache->info[opt].name);
 804         else if (!parseValue (&cache->values[opt], cache->info[opt].type, value))
 805             XML_WARNING ("illegal option value: %s.", value);
 806     }
 807 }
 808
 809 /** \brief Handler for start element events. */
 810 static void optConfStartElem (void *userData, const XML_Char *name,
 811                               const XML_Char **attr) {
 812     struct OptConfData *data = (struct OptConfData *)userData;
 813     enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
 814     switch (elem) {
 815       case OC_DRICONF:
 816         if (data->inDriConf)
 817             XML_WARNING1 ("nested <driconf> elements.");
 818         if (attr[0])
 819             XML_WARNING1 ("attributes specified on <driconf> element.");
 820         data->inDriConf++;
 821         break;
 822       case OC_DEVICE:
 823         if (!data->inDriConf)
 824             XML_WARNING1 ("<device> should be inside <driconf>.");
 825         if (data->inDevice)
 826             XML_WARNING1 ("nested <device> elements.");
 827         data->inDevice++;
 828         if (!data->ignoringDevice && !data->ignoringApp)
 829             parseDeviceAttr (data, attr);
 830         break;
 831       case OC_APPLICATION:
 832         if (!data->inDevice)
 833             XML_WARNING1 ("<application> should be inside <device>.");
 834         if (data->inApp)
 835             XML_WARNING1 ("nested <application> elements.");
 836         data->inApp++;
 837         if (!data->ignoringDevice && !data->ignoringApp)
 838             parseAppAttr (data, attr);
 839         break;
 840       case OC_OPTION:
 841         if (!data->inApp)
 842             XML_WARNING1 ("<option> should be inside <application>.");
 843         if (data->inOption)
 844             XML_WARNING1 ("nested <option> elements.");
 845         data->inOption++;
 846         if (!data->ignoringDevice && !data->ignoringApp)
 847             parseOptConfAttr (data, attr);
 848         break;
 849       default:
 850         XML_WARNING ("unknown element: %s.", name);
 851     }
 852 }
 853
 854 /** \brief Handler for end element events. */
 855 static void optConfEndElem (void *userData, const XML_Char *name) {
 856     struct OptConfData *data = (struct OptConfData *)userData;
 857     enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
 858     switch (elem) {
 859       case OC_DRICONF:
 860         data->inDriConf--;
 861         break;
 862       case OC_DEVICE:
 863         if (data->inDevice-- == data->ignoringDevice)
 864             data->ignoringDevice = 0;
 865         break;
 866       case OC_APPLICATION:
 867         if (data->inApp-- == data->ignoringApp)
 868             data->ignoringApp = 0;
 869         break;
 870       case OC_OPTION:
 871         data->inOption--;
 872         break;
 873       default:
 874         /* unknown element, warning was produced on start tag */;
 875     }
 876 }
 877
 878 /** \brief Initialize an option cache based on info */
 879 static void initOptionCache (driOptionCache *cache, const driOptionCache *info) {
 880     GLuint i, size = 1 << info->tableSize;
 881     cache->info = info->info;
 882     cache->tableSize = info->tableSize;
 883     cache->values = malloc((1<<info->tableSize) * sizeof (driOptionValue));
 884     if (cache->values == NULL) {
 885         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 886         abort();
 887     }
 888     memcpy (cache->values, info->values,
 889             (1<<info->tableSize) * sizeof (driOptionValue));
 890     for (i = 0; i < size; ++i) {
 891         if (cache->info[i].type == DRI_STRING)
 892             XSTRDUP(cache->values[i]._string, info->values[i]._string);
 893     }
 894 }
 895
 896 /** \brief Parse the named configuration file */
 897 static void parseOneConfigFile (XML_Parser p) {
 898 #define BUF_SIZE 0x1000
 899     struct OptConfData *data = (struct OptConfData *)XML_GetUserData (p);
 900     int status;
 901     int fd;
 902
 903     if ((fd = open (data->name, O_RDONLY)) == -1) {
 904         __driUtilMessage ("Can't open configuration file %s: %s.",
 905                           data->name, strerror (errno));
 906         return;
 907     }
 908
 909     while (1) {
 910         int bytesRead;
 911         void *buffer = XML_GetBuffer (p, BUF_SIZE);
 912         if (!buffer) {
 913             __driUtilMessage ("Can't allocate parser buffer.");
 914             break;
 915         }
 916         bytesRead = read (fd, buffer, BUF_SIZE);
 917         if (bytesRead == -1) {
 918             __driUtilMessage ("Error reading from configuration file %s: %s.",
 919                               data->name, strerror (errno));
 920             break;
 921         }
 922         status = XML_ParseBuffer (p, bytesRead, bytesRead == 0);
 923         if (!status) {
 924             XML_ERROR ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
 925             break;
 926         }
 927         if (bytesRead == 0)
 928             break;
 929     }
 930
 931     close (fd);
 932 #undef BUF_SIZE
 933 }
 934
 935 void driParseConfigFiles (driOptionCache *cache, const driOptionCache *info,
 936                           int screenNum, const char *driverName) {
 937     char *filenames[2] = {"/etc/drirc", NULL};
 938     char *home;
 939     uint32_t i;
 940     struct OptConfData userData;
 941
 942     initOptionCache (cache, info);
 943
 944     userData.cache = cache;
 945     userData.screenNum = screenNum;
 946     userData.driverName = driverName;
 947     userData.execName = GET_PROGRAM_NAME();
 948
 949     if ((home = getenv ("HOME"))) {
 950         uint32_t len = strlen (home);
 951         filenames[1] = malloc(len + 7+1);
 952         if (filenames[1] == NULL)
 953             __driUtilMessage ("Can't allocate memory for %s/.drirc.", home);
 954         else {
 955             memcpy (filenames[1], home, len);
 956             memcpy (filenames[1] + len, "/.drirc", 7+1);
 957         }
 958     }
 959
 960     for (i = 0; i < 2; ++i) {
 961         XML_Parser p;
 962         if (filenames[i] == NULL)
 963             continue;
 964
 965         p = XML_ParserCreate (NULL); /* use encoding specified by file */
 966         XML_SetElementHandler (p, optConfStartElem, optConfEndElem);
 967         XML_SetUserData (p, &userData);
 968         userData.parser = p;
 969         userData.name = filenames[i];
 970         userData.ignoringDevice = 0;
 971         userData.ignoringApp = 0;
 972         userData.inDriConf = 0;
 973         userData.inDevice = 0;
 974         userData.inApp = 0;
 975         userData.inOption = 0;
 976
 977         parseOneConfigFile (p);
 978         XML_ParserFree (p);
 979     }
 980
 981     free(filenames[1]);
 982 }
 983
 984 void driDestroyOptionInfo (driOptionCache *info) {
 985     driDestroyOptionCache (info);
 986     if (info->info) {
 987         uint32_t i, size = 1 << info->tableSize;
 988         for (i = 0; i < size; ++i) {
 989             if (info->info[i].name) {
 990                 free(info->info[i].name);
 991                 free(info->info[i].ranges);
 992             }
 993         }
 994         free(info->info);
 995     }
 996 }
 997
 998 void driDestroyOptionCache (driOptionCache *cache) {
 999     if (cache->info) {
1000         GLuint i, size = 1 << cache->tableSize;
1001         for (i = 0; i < size; ++i) {
1002             if (cache->info[i].type == DRI_STRING)
1003                 free(cache->values[i]._string);
1004         }
1005     }
1006     free(cache->values);
1007 }
1008
1009 unsigned char driCheckOption (const driOptionCache *cache, const char *name,
1010                           driOptionType type) {
1011     uint32_t i = findOption (cache, name);
1012     return cache->info[i].name != NULL && cache->info[i].type == type;
1013 }
1014
1015 unsigned char driQueryOptionb (const driOptionCache *cache, const char *name) {
1016     uint32_t i = findOption (cache, name);
1017   /* make sure the option is defined and has the correct type */
1018     assert (cache->info[i].name != NULL);
1019     assert (cache->info[i].type == DRI_BOOL);
1020     return cache->values[i]._bool;
1021 }
1022
1023 int driQueryOptioni (const driOptionCache *cache, const char *name) {
1024     uint32_t i = findOption (cache, name);
1025   /* make sure the option is defined and has the correct type */
1026     assert (cache->info[i].name != NULL);
1027     assert (cache->info[i].type == DRI_INT || cache->info[i].type == DRI_ENUM);
1028     return cache->values[i]._int;
1029 }
1030
1031 float driQueryOptionf (const driOptionCache *cache, const char *name) {
1032     uint32_t i = findOption (cache, name);
1033   /* make sure the option is defined and has the correct type */
1034     assert (cache->info[i].name != NULL);
1035     assert (cache->info[i].type == DRI_FLOAT);
1036     return cache->values[i]._float;
1037 }
1038
1039 char *driQueryOptionstr (const driOptionCache *cache, const char *name) {
1040     GLuint i = findOption (cache, name);
1041   /* make sure the option is defined and has the correct type */
1042     assert (cache->info[i].name != NULL);
1043     assert (cache->info[i].type == DRI_STRING);
1044     return cache->values[i]._string;
1045 }