src/util/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 <limits.h>
  31 #include <stdarg.h>
  32 #include <stdbool.h>
  33 #include <stdint.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <assert.h>
  38 #include <expat.h>
  39 #include <fcntl.h>
  40 #include <math.h>
  41 #include <unistd.h>
  42 #include <errno.h>
  43 #include <dirent.h>
  44 #include <fnmatch.h>
  45 #include <regex.h>
  46 #include "strndup.h"
  47 #include "xmlconfig.h"
  48 #include "u_process.h"
  49 #include "os_file.h"
  50
  51 /* For systems like Hurd */
  52 #ifndef PATH_MAX
  53 #define PATH_MAX 4096
  54 #endif
  55
  56 static bool
  57 be_verbose(void)
  58 {
  59    const char *s = getenv("MESA_DEBUG");
  60    if (!s)
  61       return true;
  62
  63    return strstr(s, "silent") == NULL;
  64 }
  65
  66 /** \brief Find an option in an option cache with the name as key */
  67 static uint32_t
  68 findOption(const driOptionCache *cache, const char *name)
  69 {
  70     uint32_t len = strlen (name);
  71     uint32_t size = 1 << cache->tableSize, mask = size - 1;
  72     uint32_t hash = 0;
  73     uint32_t i, shift;
  74
  75   /* compute a hash from the variable length name */
  76     for (i = 0, shift = 0; i < len; ++i, shift = (shift+8) & 31)
  77         hash += (uint32_t)name[i] << shift;
  78     hash *= hash;
  79     hash = (hash >> (16-cache->tableSize/2)) & mask;
  80
  81   /* this is just the starting point of the linear search for the option */
  82     for (i = 0; i < size; ++i, hash = (hash+1) & mask) {
  83       /* if we hit an empty entry then the option is not defined (yet) */
  84         if (cache->info[hash].name == 0)
  85             break;
  86         else if (!strcmp (name, cache->info[hash].name))
  87             break;
  88     }
  89   /* this assertion fails if the hash table is full */
  90     assert (i < size);
  91
  92     return hash;
  93 }
  94
  95 /** \brief Like strdup but using malloc and with error checking. */
  96 #define XSTRDUP(dest,source) do { \
  97     uint32_t len = strlen (source); \
  98     if (!(dest = malloc(len+1))) { \
  99         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__); \
 100         abort(); \
 101     } \
 102     memcpy (dest, source, len+1); \
 103 } while (0)
 104
 105 static int compare (const void *a, const void *b) {
 106     return strcmp (*(char *const*)a, *(char *const*)b);
 107 }
 108 /** \brief Binary search in a string array. */
 109 static uint32_t
 110 bsearchStr (const XML_Char *name, const XML_Char *elems[], uint32_t count)
 111 {
 112     const XML_Char **found;
 113     found = bsearch (&name, elems, count, sizeof (XML_Char *), compare);
 114     if (found)
 115         return found - elems;
 116     else
 117         return count;
 118 }
 119
 120 /** \brief Locale-independent integer parser.
 121  *
 122  * Works similar to strtol. Leading space is NOT skipped. The input
 123  * number may have an optional sign. Radix is specified by base. If
 124  * base is 0 then decimal is assumed unless the input number is
 125  * prefixed by 0x or 0X for hexadecimal or 0 for octal. After
 126  * returning tail points to the first character that is not part of
 127  * the integer number. If no number was found then tail points to the
 128  * start of the input string. */
 129 static int
 130 strToI(const XML_Char *string, const XML_Char **tail, int base)
 131 {
 132     int radix = base == 0 ? 10 : base;
 133     int result = 0;
 134     int sign = 1;
 135     bool numberFound = false;
 136     const XML_Char *start = string;
 137
 138     assert (radix >= 2 && radix <= 36);
 139
 140     if (*string == '-') {
 141         sign = -1;
 142         string++;
 143     } else if (*string == '+')
 144         string++;
 145     if (base == 0 && *string == '0') {
 146         numberFound = true;
 147         if (*(string+1) == 'x' || *(string+1) == 'X') {
 148             radix = 16;
 149             string += 2;
 150         } else {
 151             radix = 8;
 152             string++;
 153         }
 154     }
 155     do {
 156         int digit = -1;
 157         if (radix <= 10) {
 158             if (*string >= '0' && *string < '0' + radix)
 159                 digit = *string - '0';
 160         } else {
 161             if (*string >= '0' && *string <= '9')
 162                 digit = *string - '0';
 163             else if (*string >= 'a' && *string < 'a' + radix - 10)
 164                 digit = *string - 'a' + 10;
 165             else if (*string >= 'A' && *string < 'A' + radix - 10)
 166                 digit = *string - 'A' + 10;
 167         }
 168         if (digit != -1) {
 169             numberFound = true;
 170             result = radix*result + digit;
 171             string++;
 172         } else
 173             break;
 174     } while (true);
 175     *tail = numberFound ? string : start;
 176     return sign * result;
 177 }
 178
 179 /** \brief Locale-independent floating-point parser.
 180  *
 181  * Works similar to strtod. Leading space is NOT skipped. The input
 182  * number may have an optional sign. '.' is interpreted as decimal
 183  * point and may occur at most once. Optionally the number may end in
 184  * [eE]<exponent>, where <exponent> is an integer as recognized by
 185  * strToI. In that case the result is number * 10^exponent. After
 186  * returning tail points to the first character that is not part of
 187  * the floating point number. If no number was found then tail points
 188  * to the start of the input string.
 189  *
 190  * Uses two passes for maximum accuracy. */
 191 static float
 192 strToF(const XML_Char *string, const XML_Char **tail)
 193 {
 194     int nDigits = 0, pointPos, exponent;
 195     float sign = 1.0f, result = 0.0f, scale;
 196     const XML_Char *start = string, *numStart;
 197
 198     /* sign */
 199     if (*string == '-') {
 200         sign = -1.0f;
 201         string++;
 202     } else if (*string == '+')
 203         string++;
 204
 205     /* first pass: determine position of decimal point, number of
 206      * digits, exponent and the end of the number. */
 207     numStart = string;
 208     while (*string >= '0' && *string <= '9') {
 209         string++;
 210         nDigits++;
 211     }
 212     pointPos = nDigits;
 213     if (*string == '.') {
 214         string++;
 215         while (*string >= '0' && *string <= '9') {
 216             string++;
 217             nDigits++;
 218         }
 219     }
 220     if (nDigits == 0) {
 221         /* no digits, no number */
 222         *tail = start;
 223         return 0.0f;
 224     }
 225     *tail = string;
 226     if (*string == 'e' || *string == 'E') {
 227         const XML_Char *expTail;
 228         exponent = strToI (string+1, &expTail, 10);
 229         if (expTail == string+1)
 230             exponent = 0;
 231         else
 232             *tail = expTail;
 233     } else
 234         exponent = 0;
 235     string = numStart;
 236
 237     /* scale of the first digit */
 238     scale = sign * (float)pow (10.0, (double)(pointPos-1 + exponent));
 239
 240     /* second pass: parse digits */
 241     do {
 242         if (*string != '.') {
 243             assert (*string >= '0' && *string <= '9');
 244             result += scale * (float)(*string - '0');
 245             scale *= 0.1f;
 246             nDigits--;
 247         }
 248         string++;
 249     } while (nDigits > 0);
 250
 251     return result;
 252 }
 253
 254 /** \brief Parse a value of a given type. */
 255 static unsigned char
 256 parseValue(driOptionValue *v, driOptionType type, const XML_Char *string)
 257 {
 258     const XML_Char *tail = NULL;
 259   /* skip leading white-space */
 260     string += strspn (string, " \f\n\r\t\v");
 261     switch (type) {
 262       case DRI_BOOL:
 263         if (!strcmp (string, "false")) {
 264             v->_bool = false;
 265             tail = string + 5;
 266         } else if (!strcmp (string, "true")) {
 267             v->_bool = true;
 268             tail = string + 4;
 269         }
 270         else
 271             return false;
 272         break;
 273       case DRI_ENUM: /* enum is just a special integer */
 274       case DRI_INT:
 275         v->_int = strToI (string, &tail, 0);
 276         break;
 277       case DRI_FLOAT:
 278         v->_float = strToF (string, &tail);
 279         break;
 280       case DRI_STRING:
 281         free (v->_string);
 282         v->_string = strndup(string, STRING_CONF_MAXLEN);
 283         return true;
 284     }
 285
 286     if (tail == string)
 287         return false; /* empty string (or containing only white-space) */
 288   /* skip trailing white space */
 289     if (*tail)
 290         tail += strspn (tail, " \f\n\r\t\v");
 291     if (*tail)
 292         return false; /* something left over that is not part of value */
 293
 294     return true;
 295 }
 296
 297 /** \brief Parse a list of ranges of type info->type. */
 298 static unsigned char
 299 parseRanges(driOptionInfo *info, const XML_Char *string)
 300 {
 301     XML_Char *cp, *range;
 302     uint32_t nRanges, i;
 303     driOptionRange *ranges;
 304
 305     XSTRDUP (cp, string);
 306   /* pass 1: determine the number of ranges (number of commas + 1) */
 307     range = cp;
 308     for (nRanges = 1; *range; ++range)
 309         if (*range == ',')
 310             ++nRanges;
 311
 312     if ((ranges = malloc(nRanges*sizeof(driOptionRange))) == NULL) {
 313         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 314         abort();
 315     }
 316
 317   /* pass 2: parse all ranges into preallocated array */
 318     range = cp;
 319     for (i = 0; i < nRanges; ++i) {
 320         XML_Char *end, *sep;
 321         assert (range);
 322         end = strchr (range, ',');
 323         if (end)
 324             *end = '\0';
 325         sep = strchr (range, ':');
 326         if (sep) { /* non-empty interval */
 327             *sep = '\0';
 328             if (!parseValue (&ranges[i].start, info->type, range) ||
 329                 !parseValue (&ranges[i].end, info->type, sep+1))
 330                 break;
 331             if (info->type == DRI_INT &&
 332                 ranges[i].start._int > ranges[i].end._int)
 333                 break;
 334             if (info->type == DRI_FLOAT &&
 335                 ranges[i].start._float > ranges[i].end._float)
 336                 break;
 337         } else { /* empty interval */
 338             if (!parseValue (&ranges[i].start, info->type, range))
 339                 break;
 340             ranges[i].end = ranges[i].start;
 341         }
 342         if (end)
 343             range = end+1;
 344         else
 345             range = NULL;
 346     }
 347     free(cp);
 348     if (i < nRanges) {
 349         free(ranges);
 350         return false;
 351     } else
 352         assert (range == NULL);
 353
 354     info->nRanges = nRanges;
 355     info->ranges = ranges;
 356     return true;
 357 }
 358
 359 /** \brief Check if a value is in one of info->ranges. */
 360 static bool
 361 checkValue(const driOptionValue *v, const driOptionInfo *info)
 362 {
 363     uint32_t i;
 364     assert (info->type != DRI_BOOL); /* should be caught by the parser */
 365     if (info->nRanges == 0)
 366         return true;
 367     switch (info->type) {
 368       case DRI_ENUM: /* enum is just a special integer */
 369       case DRI_INT:
 370         for (i = 0; i < info->nRanges; ++i)
 371             if (v->_int >= info->ranges[i].start._int &&
 372                 v->_int <= info->ranges[i].end._int)
 373                 return true;
 374         break;
 375       case DRI_FLOAT:
 376         for (i = 0; i < info->nRanges; ++i)
 377             if (v->_float >= info->ranges[i].start._float &&
 378                 v->_float <= info->ranges[i].end._float)
 379                 return true;
 380         break;
 381       case DRI_STRING:
 382         break;
 383       default:
 384         assert (0); /* should never happen */
 385     }
 386     return false;
 387 }
 388
 389 /**
 390  * Print message to \c stderr if the \c LIBGL_DEBUG environment variable
 391  * is set.
 392  *
 393  * Is called from the drivers.
 394  *
 395  * \param f \c printf like format string.
 396  */
 397 static void
 398 __driUtilMessage(const char *f, ...)
 399 {
 400     va_list args;
 401     const char *libgl_debug;
 402
 403     libgl_debug=getenv("LIBGL_DEBUG");
 404     if (libgl_debug && !strstr(libgl_debug, "quiet")) {
 405         fprintf(stderr, "libGL: ");
 406         va_start(args, f);
 407         vfprintf(stderr, f, args);
 408         va_end(args);
 409         fprintf(stderr, "\n");
 410     }
 411 }
 412
 413 /** \brief Output a warning message. */
 414 #define XML_WARNING1(msg) do {\
 415     __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
 416                       (int) XML_GetCurrentLineNumber(data->parser), \
 417                       (int) XML_GetCurrentColumnNumber(data->parser)); \
 418 } while (0)
 419 #define XML_WARNING(msg, ...) do { \
 420     __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
 421                       (int) XML_GetCurrentLineNumber(data->parser), \
 422                       (int) XML_GetCurrentColumnNumber(data->parser), \
 423                       ##__VA_ARGS__); \
 424 } while (0)
 425 /** \brief Output an error message. */
 426 #define XML_ERROR1(msg) do { \
 427     __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
 428                       (int) XML_GetCurrentLineNumber(data->parser), \
 429                       (int) XML_GetCurrentColumnNumber(data->parser)); \
 430 } while (0)
 431 #define XML_ERROR(msg, ...) do { \
 432     __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
 433                       (int) XML_GetCurrentLineNumber(data->parser), \
 434                       (int) XML_GetCurrentColumnNumber(data->parser), \
 435                       ##__VA_ARGS__); \
 436 } while (0)
 437 /** \brief Output a fatal error message and abort. */
 438 #define XML_FATAL1(msg) do { \
 439     fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
 440              data->name, \
 441              (int) XML_GetCurrentLineNumber(data->parser),        \
 442              (int) XML_GetCurrentColumnNumber(data->parser)); \
 443     abort();\
 444 } while (0)
 445 #define XML_FATAL(msg, ...) do { \
 446     fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
 447              data->name, \
 448              (int) XML_GetCurrentLineNumber(data->parser), \
 449              (int) XML_GetCurrentColumnNumber(data->parser), \
 450              ##__VA_ARGS__); \
 451     abort();\
 452 } while (0)
 453
 454 /** \brief Parser context for __driConfigOptions. */
 455 struct OptInfoData {
 456     const char *name;
 457     XML_Parser parser;
 458     driOptionCache *cache;
 459     bool inDriInfo;
 460     bool inSection;
 461     bool inDesc;
 462     bool inOption;
 463     bool inEnum;
 464     int curOption;
 465 };
 466
 467 /** \brief Elements in __driConfigOptions. */
 468 enum OptInfoElem {
 469     OI_DESCRIPTION = 0, OI_DRIINFO, OI_ENUM, OI_OPTION, OI_SECTION, OI_COUNT
 470 };
 471 static const XML_Char *OptInfoElems[] = {
 472     "description", "driinfo", "enum", "option", "section"
 473 };
 474
 475 /** \brief Parse attributes of an enum element.
 476  *
 477  * We're not actually interested in the data. Just make sure this is ok
 478  * for external configuration tools.
 479  */
 480 static void
 481 parseEnumAttr(struct OptInfoData *data, const XML_Char **attr)
 482 {
 483     uint32_t i;
 484     const XML_Char *value = NULL, *text = NULL;
 485     driOptionValue v;
 486     uint32_t opt = data->curOption;
 487     for (i = 0; attr[i]; i += 2) {
 488         if (!strcmp (attr[i], "value")) value = attr[i+1];
 489         else if (!strcmp (attr[i], "text")) text = attr[i+1];
 490         else XML_FATAL("illegal enum attribute: %s.", attr[i]);
 491     }
 492     if (!value) XML_FATAL1 ("value attribute missing in enum.");
 493     if (!text) XML_FATAL1 ("text attribute missing in enum.");
 494      if (!parseValue (&v, data->cache->info[opt].type, value))
 495         XML_FATAL ("illegal enum value: %s.", value);
 496     if (!checkValue (&v, &data->cache->info[opt]))
 497         XML_FATAL ("enum value out of valid range: %s.", value);
 498 }
 499
 500 /** \brief Parse attributes of a description element.
 501  *
 502  * We're not actually interested in the data. Just make sure this is ok
 503  * for external configuration tools.
 504  */
 505 static void
 506 parseDescAttr(struct OptInfoData *data, const XML_Char **attr)
 507 {
 508     uint32_t i;
 509     const XML_Char *lang = NULL, *text = NULL;
 510     for (i = 0; attr[i]; i += 2) {
 511         if (!strcmp (attr[i], "lang")) lang = attr[i+1];
 512         else if (!strcmp (attr[i], "text")) text = attr[i+1];
 513         else XML_FATAL("illegal description attribute: %s.", attr[i]);
 514     }
 515     if (!lang) XML_FATAL1 ("lang attribute missing in description.");
 516     if (!text) XML_FATAL1 ("text attribute missing in description.");
 517 }
 518
 519 /** \brief Parse attributes of an option element. */
 520 static void
 521 parseOptInfoAttr(struct OptInfoData *data, const XML_Char **attr)
 522 {
 523     enum OptAttr {OA_DEFAULT = 0, OA_NAME, OA_TYPE, OA_VALID, OA_COUNT};
 524     static const XML_Char *optAttr[] = {"default", "name", "type", "valid"};
 525     const XML_Char *attrVal[OA_COUNT] = {NULL, NULL, NULL, NULL};
 526     const char *defaultVal;
 527     driOptionCache *cache = data->cache;
 528     uint32_t opt, i;
 529     for (i = 0; attr[i]; i += 2) {
 530         uint32_t attrName = bsearchStr (attr[i], optAttr, OA_COUNT);
 531         if (attrName >= OA_COUNT)
 532             XML_FATAL ("illegal option attribute: %s", attr[i]);
 533         attrVal[attrName] = attr[i+1];
 534     }
 535     if (!attrVal[OA_NAME]) XML_FATAL1 ("name attribute missing in option.");
 536     if (!attrVal[OA_TYPE]) XML_FATAL1 ("type attribute missing in option.");
 537     if (!attrVal[OA_DEFAULT]) XML_FATAL1 ("default attribute missing in option.");
 538
 539     opt = findOption (cache, attrVal[OA_NAME]);
 540     if (cache->info[opt].name)
 541         XML_FATAL ("option %s redefined.", attrVal[OA_NAME]);
 542     data->curOption = opt;
 543
 544     XSTRDUP (cache->info[opt].name, attrVal[OA_NAME]);
 545
 546     if (!strcmp (attrVal[OA_TYPE], "bool"))
 547         cache->info[opt].type = DRI_BOOL;
 548     else if (!strcmp (attrVal[OA_TYPE], "enum"))
 549         cache->info[opt].type = DRI_ENUM;
 550     else if (!strcmp (attrVal[OA_TYPE], "int"))
 551         cache->info[opt].type = DRI_INT;
 552     else if (!strcmp (attrVal[OA_TYPE], "float"))
 553         cache->info[opt].type = DRI_FLOAT;
 554     else if (!strcmp (attrVal[OA_TYPE], "string"))
 555         cache->info[opt].type = DRI_STRING;
 556     else
 557         XML_FATAL ("illegal type in option: %s.", attrVal[OA_TYPE]);
 558
 559     defaultVal = getenv (cache->info[opt].name);
 560     if (defaultVal != NULL) {
 561       /* don't use XML_WARNING, we want the user to see this! */
 562         if (be_verbose()) {
 563             fprintf(stderr,
 564                     "ATTENTION: default value of option %s overridden by environment.\n",
 565                     cache->info[opt].name);
 566         }
 567     } else
 568         defaultVal = attrVal[OA_DEFAULT];
 569     if (!parseValue (&cache->values[opt], cache->info[opt].type, defaultVal))
 570         XML_FATAL ("illegal default value for %s: %s.", cache->info[opt].name, defaultVal);
 571
 572     if (attrVal[OA_VALID]) {
 573         if (cache->info[opt].type == DRI_BOOL)
 574             XML_FATAL1 ("boolean option with valid attribute.");
 575         if (!parseRanges (&cache->info[opt], attrVal[OA_VALID]))
 576             XML_FATAL ("illegal valid attribute: %s.", attrVal[OA_VALID]);
 577         if (!checkValue (&cache->values[opt], &cache->info[opt]))
 578             XML_FATAL ("default value out of valid range '%s': %s.",
 579                        attrVal[OA_VALID], defaultVal);
 580     } else if (cache->info[opt].type == DRI_ENUM) {
 581         XML_FATAL1 ("valid attribute missing in option (mandatory for enums).");
 582     } else {
 583         cache->info[opt].nRanges = 0;
 584         cache->info[opt].ranges = NULL;
 585     }
 586 }
 587
 588 /** \brief Handler for start element events. */
 589 static void
 590 optInfoStartElem(void *userData, const XML_Char *name, const XML_Char **attr)
 591 {
 592     struct OptInfoData *data = (struct OptInfoData *)userData;
 593     enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
 594     switch (elem) {
 595       case OI_DRIINFO:
 596         if (data->inDriInfo)
 597             XML_FATAL1 ("nested <driinfo> elements.");
 598         if (attr[0])
 599             XML_FATAL1 ("attributes specified on <driinfo> element.");
 600         data->inDriInfo = true;
 601         break;
 602       case OI_SECTION:
 603         if (!data->inDriInfo)
 604             XML_FATAL1 ("<section> must be inside <driinfo>.");
 605         if (data->inSection)
 606             XML_FATAL1 ("nested <section> elements.");
 607         if (attr[0])
 608             XML_FATAL1 ("attributes specified on <section> element.");
 609         data->inSection = true;
 610         break;
 611       case OI_DESCRIPTION:
 612         if (!data->inSection && !data->inOption)
 613             XML_FATAL1 ("<description> must be inside <description> or <option.");
 614         if (data->inDesc)
 615             XML_FATAL1 ("nested <description> elements.");
 616         data->inDesc = true;
 617         parseDescAttr (data, attr);
 618         break;
 619       case OI_OPTION:
 620         if (!data->inSection)
 621             XML_FATAL1 ("<option> must be inside <section>.");
 622         if (data->inDesc)
 623             XML_FATAL1 ("<option> nested in <description> element.");
 624         if (data->inOption)
 625             XML_FATAL1 ("nested <option> elements.");
 626         data->inOption = true;
 627         parseOptInfoAttr (data, attr);
 628         break;
 629       case OI_ENUM:
 630         if (!(data->inOption && data->inDesc))
 631             XML_FATAL1 ("<enum> must be inside <option> and <description>.");
 632         if (data->inEnum)
 633             XML_FATAL1 ("nested <enum> elements.");
 634         data->inEnum = true;
 635         parseEnumAttr (data, attr);
 636         break;
 637       default:
 638         XML_FATAL ("unknown element: %s.", name);
 639     }
 640 }
 641
 642 /** \brief Handler for end element events. */
 643 static void
 644 optInfoEndElem(void *userData, const XML_Char *name)
 645 {
 646     struct OptInfoData *data = (struct OptInfoData *)userData;
 647     enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
 648     switch (elem) {
 649       case OI_DRIINFO:
 650         data->inDriInfo = false;
 651         break;
 652       case OI_SECTION:
 653         data->inSection = false;
 654         break;
 655       case OI_DESCRIPTION:
 656         data->inDesc = false;
 657         break;
 658       case OI_OPTION:
 659         data->inOption = false;
 660         break;
 661       case OI_ENUM:
 662         data->inEnum = false;
 663         break;
 664       default:
 665         assert (0); /* should have been caught by StartElem */
 666     }
 667 }
 668
 669 void
 670 driParseOptionInfo(driOptionCache *info, const char *configOptions)
 671 {
 672     XML_Parser p;
 673     int status;
 674     struct OptInfoData userData;
 675     struct OptInfoData *data = &userData;
 676
 677     /* Make the hash table big enough to fit more than the maximum number of
 678      * config options we've ever seen in a driver.
 679      */
 680     info->tableSize = 6;
 681     info->info = calloc(1 << info->tableSize, sizeof (driOptionInfo));
 682     info->values = calloc(1 << info->tableSize, sizeof (driOptionValue));
 683     if (info->info == NULL || info->values == NULL) {
 684         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 685         abort();
 686     }
 687
 688     p = XML_ParserCreate ("UTF-8"); /* always UTF-8 */
 689     XML_SetElementHandler (p, optInfoStartElem, optInfoEndElem);
 690     XML_SetUserData (p, data);
 691
 692     userData.name = "__driConfigOptions";
 693     userData.parser = p;
 694     userData.cache = info;
 695     userData.inDriInfo = false;
 696     userData.inSection = false;
 697     userData.inDesc = false;
 698     userData.inOption = false;
 699     userData.inEnum = false;
 700     userData.curOption = -1;
 701
 702     status = XML_Parse (p, configOptions, strlen (configOptions), 1);
 703     if (!status)
 704         XML_FATAL ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
 705
 706     XML_ParserFree (p);
 707 }
 708
 709 /** \brief Parser context for configuration files. */
 710 struct OptConfData {
 711     const char *name;
 712     XML_Parser parser;
 713     driOptionCache *cache;
 714     int screenNum;
 715     const char *driverName, *execName;
 716     const char *kernelDriverName;
 717     const char *engineName;
 718     uint32_t engineVersion;
 719     uint32_t ignoringDevice;
 720     uint32_t ignoringApp;
 721     uint32_t inDriConf;
 722     uint32_t inDevice;
 723     uint32_t inApp;
 724     uint32_t inOption;
 725 };
 726
 727 /** \brief Elements in configuration files. */
 728 enum OptConfElem {
 729     OC_APPLICATION = 0, OC_DEVICE, OC_DRICONF, OC_ENGINE, OC_OPTION, OC_COUNT
 730 };
 731 static const XML_Char *OptConfElems[] = {
 732     [OC_APPLICATION]  = "application",
 733     [OC_DEVICE] = "device",
 734     [OC_DRICONF] = "driconf",
 735     [OC_ENGINE]  = "engine",
 736     [OC_OPTION] = "option",
 737 };
 738
 739 /** \brief Parse attributes of a device element. */
 740 static void
 741 parseDeviceAttr(struct OptConfData *data, const XML_Char **attr)
 742 {
 743     uint32_t i;
 744     const XML_Char *driver = NULL, *screen = NULL, *kernel = NULL;
 745     for (i = 0; attr[i]; i += 2) {
 746         if (!strcmp (attr[i], "driver")) driver = attr[i+1];
 747         else if (!strcmp (attr[i], "screen")) screen = attr[i+1];
 748         else if (!strcmp (attr[i], "kernel_driver")) kernel = attr[i+1];
 749         else XML_WARNING("unknown device attribute: %s.", attr[i]);
 750     }
 751     if (driver && strcmp (driver, data->driverName))
 752         data->ignoringDevice = data->inDevice;
 753     else if (kernel && (!data->kernelDriverName || strcmp (kernel, data->kernelDriverName)))
 754         data->ignoringDevice = data->inDevice;
 755     else if (screen) {
 756         driOptionValue screenNum;
 757         if (!parseValue (&screenNum, DRI_INT, screen))
 758             XML_WARNING("illegal screen number: %s.", screen);
 759         else if (screenNum._int != data->screenNum)
 760             data->ignoringDevice = data->inDevice;
 761     }
 762 }
 763
 764 static bool
 765 valueInRanges(const driOptionInfo *info, uint32_t value)
 766 {
 767     uint32_t i;
 768
 769     for (i = 0; i < info->nRanges; i++) {
 770        if (info->ranges[i].start._int <= value &&
 771            info->ranges[i].end._int >= value)
 772            return true;
 773     }
 774
 775     return false;
 776 }
 777
 778 /** \brief Parse attributes of an application element. */
 779 static void
 780 parseAppAttr(struct OptConfData *data, const XML_Char **attr)
 781 {
 782     uint32_t i;
 783     const XML_Char *exec = NULL;
 784     const XML_Char *sha1 = NULL;
 785     for (i = 0; attr[i]; i += 2) {
 786         if (!strcmp (attr[i], "name")) /* not needed here */;
 787         else if (!strcmp (attr[i], "executable")) exec = attr[i+1];
 788         else if (!strcmp (attr[i], "sha1")) sha1 = attr[i+1];
 789         else XML_WARNING("unknown application attribute: %s.", attr[i]);
 790     }
 791     if (exec && strcmp (exec, data->execName)) {
 792         data->ignoringApp = data->inApp;
 793     } else if (sha1) {
 794         /* SHA1_DIGEST_STRING_LENGTH includes terminating null byte */
 795         if (strlen(sha1) != (SHA1_DIGEST_STRING_LENGTH - 1)) {
 796             XML_WARNING("Incorrect sha1 application attribute");
 797             data->ignoringApp = data->inApp;
 798         } else {
 799             size_t len;
 800             char* content;
 801             char path[PATH_MAX];
 802             if (util_get_process_exec_path(path, ARRAY_SIZE(path)) > 0 &&
 803                 (content = os_read_file(path, &len))) {
 804                 uint8_t sha1x[SHA1_DIGEST_LENGTH];
 805                 char sha1s[SHA1_DIGEST_STRING_LENGTH];
 806                 _mesa_sha1_compute(content, len, sha1x);
 807                 _mesa_sha1_format((char*) sha1s, sha1x);
 808                 free(content);
 809
 810                 if (strcmp(sha1, sha1s)) {
 811                     data->ignoringApp = data->inApp;
 812                 }
 813             } else {
 814                 data->ignoringApp = data->inApp;
 815             }
 816         }
 817     }
 818 }
 819
 820 /** \brief Parse attributes of an application element. */
 821 static void
 822 parseEngineAttr(struct OptConfData *data, const XML_Char **attr)
 823 {
 824     uint32_t i;
 825     const XML_Char *engine_name_match = NULL, *engine_versions = NULL;
 826     driOptionInfo version_ranges = {
 827        .type = DRI_INT,
 828     };
 829     for (i = 0; attr[i]; i += 2) {
 830         if (!strcmp (attr[i], "name")) /* not needed here */;
 831         else if (!strcmp (attr[i], "engine_name_match")) engine_name_match = attr[i+1];
 832         else if (!strcmp (attr[i], "engine_versions")) engine_versions = attr[i+1];
 833         else XML_WARNING("unknown application attribute: %s.", attr[i]);
 834     }
 835     if (engine_name_match) {
 836        regex_t re;
 837
 838        if (regcomp (&re, engine_name_match, REG_EXTENDED|REG_NOSUB) == 0) {
 839           if (regexec (&re, data->engineName, 0, NULL, 0) == REG_NOMATCH)
 840              data->ignoringApp = data->inApp;
 841           regfree (&re);
 842        } else
 843           XML_WARNING ("Invalid engine_name_match=\"%s\".", engine_name_match);
 844     }
 845     if (engine_versions) {
 846        if (parseRanges (&version_ranges, engine_versions) &&
 847            !valueInRanges (&version_ranges, data->engineVersion))
 848           data->ignoringApp = data->inApp;
 849     }
 850
 851     free(version_ranges.ranges);
 852 }
 853
 854 /** \brief Parse attributes of an option element. */
 855 static void
 856 parseOptConfAttr(struct OptConfData *data, const XML_Char **attr)
 857 {
 858     uint32_t i;
 859     const XML_Char *name = NULL, *value = NULL;
 860     for (i = 0; attr[i]; i += 2) {
 861         if (!strcmp (attr[i], "name")) name = attr[i+1];
 862         else if (!strcmp (attr[i], "value")) value = attr[i+1];
 863         else XML_WARNING("unknown option attribute: %s.", attr[i]);
 864     }
 865     if (!name) XML_WARNING1 ("name attribute missing in option.");
 866     if (!value) XML_WARNING1 ("value attribute missing in option.");
 867     if (name && value) {
 868         driOptionCache *cache = data->cache;
 869         uint32_t opt = findOption (cache, name);
 870         if (cache->info[opt].name == NULL)
 871             /* don't use XML_WARNING, drirc defines options for all drivers,
 872              * but not all drivers support them */
 873             return;
 874         else if (getenv (cache->info[opt].name)) {
 875           /* don't use XML_WARNING, we want the user to see this! */
 876             if (be_verbose()) {
 877                 fprintf(stderr,
 878                         "ATTENTION: option value of option %s ignored.\n",
 879                         cache->info[opt].name);
 880             }
 881         } else if (!parseValue (&cache->values[opt], cache->info[opt].type, value))
 882             XML_WARNING ("illegal option value: %s.", value);
 883     }
 884 }
 885
 886 /** \brief Handler for start element events. */
 887 static void
 888 optConfStartElem(void *userData, const XML_Char *name,
 889                  const XML_Char **attr)
 890 {
 891     struct OptConfData *data = (struct OptConfData *)userData;
 892     enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
 893     switch (elem) {
 894       case OC_DRICONF:
 895         if (data->inDriConf)
 896             XML_WARNING1 ("nested <driconf> elements.");
 897         if (attr[0])
 898             XML_WARNING1 ("attributes specified on <driconf> element.");
 899         data->inDriConf++;
 900         break;
 901       case OC_DEVICE:
 902         if (!data->inDriConf)
 903             XML_WARNING1 ("<device> should be inside <driconf>.");
 904         if (data->inDevice)
 905             XML_WARNING1 ("nested <device> elements.");
 906         data->inDevice++;
 907         if (!data->ignoringDevice && !data->ignoringApp)
 908             parseDeviceAttr (data, attr);
 909         break;
 910       case OC_APPLICATION:
 911         if (!data->inDevice)
 912             XML_WARNING1 ("<application> should be inside <device>.");
 913         if (data->inApp)
 914             XML_WARNING1 ("nested <application> or <engine> elements.");
 915         data->inApp++;
 916         if (!data->ignoringDevice && !data->ignoringApp)
 917             parseAppAttr (data, attr);
 918         break;
 919       case OC_ENGINE:
 920         if (!data->inDevice)
 921             XML_WARNING1 ("<engine> should be inside <device>.");
 922         if (data->inApp)
 923             XML_WARNING1 ("nested <application> or <engine> elements.");
 924         data->inApp++;
 925         if (!data->ignoringDevice && !data->ignoringApp)
 926             parseEngineAttr (data, attr);
 927         break;
 928       case OC_OPTION:
 929         if (!data->inApp)
 930             XML_WARNING1 ("<option> should be inside <application>.");
 931         if (data->inOption)
 932             XML_WARNING1 ("nested <option> elements.");
 933         data->inOption++;
 934         if (!data->ignoringDevice && !data->ignoringApp)
 935             parseOptConfAttr (data, attr);
 936         break;
 937       default:
 938         XML_WARNING ("unknown element: %s.", name);
 939     }
 940 }
 941
 942 /** \brief Handler for end element events. */
 943 static void
 944 optConfEndElem(void *userData, const XML_Char *name)
 945 {
 946     struct OptConfData *data = (struct OptConfData *)userData;
 947     enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
 948     switch (elem) {
 949       case OC_DRICONF:
 950         data->inDriConf--;
 951         break;
 952       case OC_DEVICE:
 953         if (data->inDevice-- == data->ignoringDevice)
 954             data->ignoringDevice = 0;
 955         break;
 956       case OC_APPLICATION:
 957       case OC_ENGINE:
 958         if (data->inApp-- == data->ignoringApp)
 959             data->ignoringApp = 0;
 960         break;
 961       case OC_OPTION:
 962         data->inOption--;
 963         break;
 964       default:
 965         /* unknown element, warning was produced on start tag */;
 966     }
 967 }
 968
 969 /** \brief Initialize an option cache based on info */
 970 static void
 971 initOptionCache(driOptionCache *cache, const driOptionCache *info)
 972 {
 973     unsigned i, size = 1 << info->tableSize;
 974     cache->info = info->info;
 975     cache->tableSize = info->tableSize;
 976     cache->values = malloc((1<<info->tableSize) * sizeof (driOptionValue));
 977     if (cache->values == NULL) {
 978         fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
 979         abort();
 980     }
 981     memcpy (cache->values, info->values,
 982             (1<<info->tableSize) * sizeof (driOptionValue));
 983     for (i = 0; i < size; ++i) {
 984         if (cache->info[i].type == DRI_STRING)
 985             XSTRDUP(cache->values[i]._string, info->values[i]._string);
 986     }
 987 }
 988
 989 static void
 990 _parseOneConfigFile(XML_Parser p)
 991 {
 992 #define BUF_SIZE 0x1000
 993     struct OptConfData *data = (struct OptConfData *)XML_GetUserData (p);
 994     int status;
 995     int fd;
 996
 997     if ((fd = open (data->name, O_RDONLY)) == -1) {
 998         __driUtilMessage ("Can't open configuration file %s: %s.",
 999                           data->name, strerror (errno));
1000         return;
1001     }
1002
1003     while (1) {
1004         int bytesRead;
1005         void *buffer = XML_GetBuffer (p, BUF_SIZE);
1006         if (!buffer) {
1007             __driUtilMessage ("Can't allocate parser buffer.");
1008             break;
1009         }
1010         bytesRead = read (fd, buffer, BUF_SIZE);
1011         if (bytesRead == -1) {
1012             __driUtilMessage ("Error reading from configuration file %s: %s.",
1013                               data->name, strerror (errno));
1014             break;
1015         }
1016         status = XML_ParseBuffer (p, bytesRead, bytesRead == 0);
1017         if (!status) {
1018             XML_ERROR ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
1019             break;
1020         }
1021         if (bytesRead == 0)
1022             break;
1023     }
1024
1025     close (fd);
1026 #undef BUF_SIZE
1027 }
1028
1029 /** \brief Parse the named configuration file */
1030 static void
1031 parseOneConfigFile(struct OptConfData *data, const char *filename)
1032 {
1033     XML_Parser p;
1034
1035     p = XML_ParserCreate (NULL); /* use encoding specified by file */
1036     XML_SetElementHandler (p, optConfStartElem, optConfEndElem);
1037     XML_SetUserData (p, data);
1038     data->parser = p;
1039     data->name = filename;
1040     data->ignoringDevice = 0;
1041     data->ignoringApp = 0;
1042     data->inDriConf = 0;
1043     data->inDevice = 0;
1044     data->inApp = 0;
1045     data->inOption = 0;
1046
1047     _parseOneConfigFile (p);
1048     XML_ParserFree (p);
1049 }
1050
1051 static int
1052 scandir_filter(const struct dirent *ent)
1053 {
1054 #ifndef DT_REG /* systems without d_type in dirent results */
1055     struct stat st;
1056
1057     if ((lstat(ent->d_name, &st) != 0) ||
1058         (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode)))
1059        return 0;
1060 #else
1061     if (ent->d_type != DT_REG && ent->d_type != DT_LNK)
1062        return 0;
1063 #endif
1064
1065     if (fnmatch("*.conf", ent->d_name, 0))
1066        return 0;
1067
1068     return 1;
1069 }
1070
1071 /** \brief Parse configuration files in a directory */
1072 static void
1073 parseConfigDir(struct OptConfData *data, const char *dirname)
1074 {
1075     int i, count;
1076     struct dirent **entries = NULL;
1077
1078     count = scandir(dirname, &entries, scandir_filter, alphasort);
1079     if (count < 0)
1080         return;
1081
1082     for (i = 0; i < count; i++) {
1083         char filename[PATH_MAX];
1084
1085         snprintf(filename, PATH_MAX, "%s/%s", dirname, entries[i]->d_name);
1086         free(entries[i]);
1087
1088         parseOneConfigFile(data, filename);
1089     }
1090
1091     free(entries);
1092 }
1093
1094 #ifndef SYSCONFDIR
1095 #define SYSCONFDIR "/etc"
1096 #endif
1097
1098 #ifndef DATADIR
1099 #define DATADIR "/usr/share"
1100 #endif
1101
1102 void
1103 driParseConfigFiles(driOptionCache *cache, const driOptionCache *info,
1104                     int screenNum, const char *driverName,
1105                     const char *kernelDriverName,
1106                     const char *engineName, uint32_t engineVersion)
1107 {
1108     char *home;
1109     struct OptConfData userData;
1110
1111     initOptionCache (cache, info);
1112
1113     userData.cache = cache;
1114     userData.screenNum = screenNum;
1115     userData.driverName = driverName;
1116     userData.kernelDriverName = kernelDriverName;
1117     userData.engineName = engineName ? engineName : "";
1118     userData.engineVersion = engineVersion;
1119     userData.execName = util_get_process_name();
1120
1121     parseConfigDir(&userData, DATADIR "/drirc.d");
1122     parseOneConfigFile(&userData, SYSCONFDIR "/drirc");
1123
1124     if ((home = getenv ("HOME"))) {
1125         char filename[PATH_MAX];
1126
1127         snprintf(filename, PATH_MAX, "%s/.drirc", home);
1128         parseOneConfigFile(&userData, filename);
1129     }
1130 }
1131
1132 void
1133 driDestroyOptionInfo(driOptionCache *info)
1134 {
1135     driDestroyOptionCache(info);
1136     if (info->info) {
1137         uint32_t i, size = 1 << info->tableSize;
1138         for (i = 0; i < size; ++i) {
1139             if (info->info[i].name) {
1140                 free(info->info[i].name);
1141                 free(info->info[i].ranges);
1142             }
1143         }
1144         free(info->info);
1145     }
1146 }
1147
1148 void
1149 driDestroyOptionCache(driOptionCache *cache)
1150 {
1151     if (cache->info) {
1152         unsigned i, size = 1 << cache->tableSize;
1153         for (i = 0; i < size; ++i) {
1154             if (cache->info[i].type == DRI_STRING)
1155                 free(cache->values[i]._string);
1156         }
1157     }
1158     free(cache->values);
1159 }
1160
1161 unsigned char
1162 driCheckOption(const driOptionCache *cache, const char *name,
1163                driOptionType type)
1164 {
1165     uint32_t i = findOption (cache, name);
1166     return cache->info[i].name != NULL && cache->info[i].type == type;
1167 }
1168
1169 unsigned char
1170 driQueryOptionb(const driOptionCache *cache, const char *name)
1171 {
1172     uint32_t i = findOption (cache, name);
1173   /* make sure the option is defined and has the correct type */
1174     assert (cache->info[i].name != NULL);
1175     assert (cache->info[i].type == DRI_BOOL);
1176     return cache->values[i]._bool;
1177 }
1178
1179 int
1180 driQueryOptioni(const driOptionCache *cache, const char *name)
1181 {
1182     uint32_t i = findOption (cache, name);
1183   /* make sure the option is defined and has the correct type */
1184     assert (cache->info[i].name != NULL);
1185     assert (cache->info[i].type == DRI_INT || cache->info[i].type == DRI_ENUM);
1186     return cache->values[i]._int;
1187 }
1188
1189 float
1190 driQueryOptionf(const driOptionCache *cache, const char *name)
1191 {
1192     uint32_t i = findOption (cache, name);
1193   /* make sure the option is defined and has the correct type */
1194     assert (cache->info[i].name != NULL);
1195     assert (cache->info[i].type == DRI_FLOAT);
1196     return cache->values[i]._float;
1197 }
1198
1199 char *
1200 driQueryOptionstr(const driOptionCache *cache, const char *name)
1201 {
1202     uint32_t i = findOption (cache, name);
1203   /* make sure the option is defined and has the correct type */
1204     assert (cache->info[i].name != NULL);
1205     assert (cache->info[i].type == DRI_STRING);
1206     return cache->values[i]._string;
1207 }