pixman git update 18 July 2011

1 files changed, 1022 insertions, 1022 deletions

diff --git a/mesalib/src/mesa/drivers/dri/common/xmlconfig.c b/mesalib/src/mesa/drivers/dri/common/xmlconfig.c
index 30075f253..77967ac2a 100644
--- a/mesalib/src/mesa/drivers/dri/common/xmlconfig.c
+++ b/mesalib/src/mesa/drivers/dri/common/xmlconfig.c
@@ -1,1022 +1,1022 @@
-/*

- * XML DRI client-side driver configuration

- * Copyright (C) 2003 Felix Kuehling

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included

- * in all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

- * FELIX KUEHLING, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 

- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 

- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 

- * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

- * 

- */

-/**

- * \file xmlconfig.c

- * \brief Driver-independent client-side part of the XML configuration

- * \author Felix Kuehling

- */

-

-#include "main/glheader.h"

-

-#include <string.h>

-#include <assert.h>

-#include <expat.h>

-#include <fcntl.h>

-#include <unistd.h>

-#include <errno.h>

-#include "main/imports.h"

-#include "utils.h"

-#include "xmlconfig.h"

-

-#undef GET_PROGRAM_NAME

-

-#if (defined(__GNU_LIBRARY__) || defined(__GLIBC__)) && !defined(__UCLIBC__)

-#    if !defined(__GLIBC__) || (__GLIBC__ < 2)

-/* These aren't declared in any libc5 header */

-extern char *program_invocation_name, *program_invocation_short_name;

-#    endif

-#    define GET_PROGRAM_NAME() program_invocation_short_name

-#elif defined(__FreeBSD__) && (__FreeBSD__ >= 2)

-#    include <osreldate.h>

-#    if (__FreeBSD_version >= 440000)

-#        include <stdlib.h>

-#        define GET_PROGRAM_NAME() getprogname()

-#    endif

-#elif defined(__NetBSD__) && defined(__NetBSD_Version) && (__NetBSD_Version >= 106000100)

-#    include <stdlib.h>

-#    define GET_PROGRAM_NAME() getprogname()

-#elif defined(__APPLE__)

-#    include <stdlib.h>

-#    define GET_PROGRAM_NAME() getprogname()

-#elif defined(__sun)

-/* Solaris has getexecname() which returns the full path - return just

-   the basename to match BSD getprogname() */

-#    include <stdlib.h>

-#    include <libgen.h>

-

-static const char *__getProgramName () {

-    static const char *progname;

-

-    if (progname == NULL) {

-	const char *e = getexecname();

-	if (e != NULL) {

-	    /* Have to make a copy since getexecname can return a readonly

-	       string, but basename expects to be able to modify its arg. */

-	    char *n = strdup(e);

-	    if (n != NULL) {

-		progname = basename(n);

-	    }

-	}

-    }

-    return progname;

-}

-

-#    define GET_PROGRAM_NAME() __getProgramName()

-#endif

-

-#if !defined(GET_PROGRAM_NAME)

-#    if defined(__OpenBSD__) || defined(NetBSD) || defined(__UCLIBC__)

-/* This is a hack. It's said to work on OpenBSD, NetBSD and GNU.

- * Rogelio M.Serrano Jr. reported it's also working with UCLIBC. It's

- * used as a last resort, if there is no documented facility available. */

-static const char *__getProgramName () {

-    extern const char *__progname;

-    char * arg = strrchr(__progname, '/');

-    if (arg)

-        return arg+1;

-    else

-        return __progname;

-}

-#        define GET_PROGRAM_NAME() __getProgramName()

-#    else

-#        define GET_PROGRAM_NAME() ""

-#        warning "Per application configuration won't work with your OS version."

-#    endif

-#endif

-

-/** \brief Find an option in an option cache with the name as key */

-static GLuint findOption (const driOptionCache *cache, const char *name) {

-    GLuint len = strlen (name);

-    GLuint size = 1 << cache->tableSize, mask = size - 1;

-    GLuint hash = 0;

-    GLuint i, shift;

-

-  /* compute a hash from the variable length name */

-    for (i = 0, shift = 0; i < len; ++i, shift = (shift+8) & 31)

-	hash += (GLuint)name[i] << shift;

-    hash *= hash;

-    hash = (hash >> (16-cache->tableSize/2)) & mask;

-

-  /* this is just the starting point of the linear search for the option */

-    for (i = 0; i < size; ++i, hash = (hash+1) & mask) {

-      /* if we hit an empty entry then the option is not defined (yet) */

-	if (cache->info[hash].name == 0)

-	    break;

-	else if (!strcmp (name, cache->info[hash].name))

-	    break;

-    }

-  /* this assertion fails if the hash table is full */

-    assert (i < size);

-

-    return hash;

-}

-

-/** \brief Count the real number of options in an option cache */

-static GLuint countOptions (const driOptionCache *cache) {

-    GLuint size = 1 << cache->tableSize;

-    GLuint i, count = 0;

-    for (i = 0; i < size; ++i)

-	if (cache->info[i].name)

-	    count++;

-    return count;

-}

-

-/** \brief Like strdup but using MALLOC and with error checking. */

-#define XSTRDUP(dest,source) do { \

-    GLuint len = strlen (source); \

-    if (!(dest = MALLOC (len+1))) { \

-	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__); \

-	abort(); \

-    } \

-    memcpy (dest, source, len+1); \

-} while (0)

-

-static int compare (const void *a, const void *b) {

-    return strcmp (*(char *const*)a, *(char *const*)b);

-}

-/** \brief Binary search in a string array. */

-static GLuint bsearchStr (const XML_Char *name,

-			  const XML_Char *elems[], GLuint count) {

-    const XML_Char **found;

-    found = bsearch (&name, elems, count, sizeof (XML_Char *), compare);

-    if (found)

-	return found - elems;

-    else

-	return count;

-}

-

-/** \brief Locale-independent integer parser.

- *

- * Works similar to strtol. Leading space is NOT skipped. The input

- * number may have an optional sign. Radix is specified by base. If

- * base is 0 then decimal is assumed unless the input number is

- * prefixed by 0x or 0X for hexadecimal or 0 for octal. After

- * returning tail points to the first character that is not part of

- * the integer number. If no number was found then tail points to the

- * start of the input string. */

-static GLint strToI (const XML_Char *string, const XML_Char **tail, int base) {

-    GLint radix = base == 0 ? 10 : base;

-    GLint result = 0;

-    GLint sign = 1;

-    GLboolean numberFound = GL_FALSE;

-    const XML_Char *start = string;

-

-    assert (radix >= 2 && radix <= 36);

-

-    if (*string == '-') {

-	sign = -1;

-	string++;

-    } else if (*string == '+')

-	string++;

-    if (base == 0 && *string == '0') {

-	numberFound = GL_TRUE; 

-	if (*(string+1) == 'x' || *(string+1) == 'X') {

-	    radix = 16;

-	    string += 2;

-	} else {

-	    radix = 8;

-	    string++;

-	}

-    }

-    do {

-	GLint digit = -1;

-	if (radix <= 10) {

-	    if (*string >= '0' && *string < '0' + radix)

-		digit = *string - '0';

-	} else {

-	    if (*string >= '0' && *string <= '9')

-		digit = *string - '0';

-	    else if (*string >= 'a' && *string < 'a' + radix - 10)

-		digit = *string - 'a' + 10;

-	    else if (*string >= 'A' && *string < 'A' + radix - 10)

-		digit = *string - 'A' + 10;

-	}

-	if (digit != -1) {

-	    numberFound = GL_TRUE;

-	    result = radix*result + digit;

-	    string++;

-	} else

-	    break;

-    } while (GL_TRUE);

-    *tail = numberFound ? string : start;

-    return sign * result;

-}

-

-/** \brief Locale-independent floating-point parser.

- *

- * Works similar to strtod. Leading space is NOT skipped. The input

- * number may have an optional sign. '.' is interpreted as decimal

- * point and may occur at most once. Optionally the number may end in

- * [eE]<exponent>, where <exponent> is an integer as recognized by

- * strToI. In that case the result is number * 10^exponent. After

- * returning tail points to the first character that is not part of

- * the floating point number. If no number was found then tail points

- * to the start of the input string.

- *

- * Uses two passes for maximum accuracy. */

-static GLfloat strToF (const XML_Char *string, const XML_Char **tail) {

-    GLint nDigits = 0, pointPos, exponent;

-    GLfloat sign = 1.0f, result = 0.0f, scale;

-    const XML_Char *start = string, *numStart;

-

-    /* sign */

-    if (*string == '-') {

-	sign = -1.0f;

-	string++;

-    } else if (*string == '+')

-	string++;

-

-    /* first pass: determine position of decimal point, number of

-     * digits, exponent and the end of the number. */

-    numStart = string;

-    while (*string >= '0' && *string <= '9') {

-	string++;

-	nDigits++;

-    }

-    pointPos = nDigits;

-    if (*string == '.') {

-	string++;

-	while (*string >= '0' && *string <= '9') {

-	    string++;

-	    nDigits++;

-	}

-    }

-    if (nDigits == 0) {

-	/* no digits, no number */

-	*tail = start;

-	return 0.0f;

-    }

-    *tail = string;

-    if (*string == 'e' || *string == 'E') {

-	const XML_Char *expTail;

-	exponent = strToI (string+1, &expTail, 10);

-	if (expTail == string+1)

-	    exponent = 0;

-	else

-	    *tail = expTail;

-    } else

-	exponent = 0;

-    string = numStart;

-

-    /* scale of the first digit */

-    scale = sign * (GLfloat)pow (10.0, (GLdouble)(pointPos-1 + exponent));

-

-    /* second pass: parse digits */

-    do {

-	if (*string != '.') {

-	    assert (*string >= '0' && *string <= '9');

-	    result += scale * (GLfloat)(*string - '0');

-	    scale *= 0.1f;

-	    nDigits--;

-	}

-	string++;

-    } while (nDigits > 0);

-

-    return result;

-}

-

-/** \brief Parse a value of a given type. */

-static GLboolean parseValue (driOptionValue *v, driOptionType type,

-			     const XML_Char *string) {

-    const XML_Char *tail = NULL;

-  /* skip leading white-space */

-    string += strspn (string, " \f\n\r\t\v");

-    switch (type) {

-      case DRI_BOOL:

-	if (!strcmp (string, "false")) {

-	    v->_bool = GL_FALSE;

-	    tail = string + 5;

-	} else if (!strcmp (string, "true")) {

-	    v->_bool = GL_TRUE;

-	    tail = string + 4;

-	}

-	else

-	    return GL_FALSE;

-	break;

-      case DRI_ENUM: /* enum is just a special integer */

-      case DRI_INT:

-	v->_int = strToI (string, &tail, 0);

-	break;

-      case DRI_FLOAT:

-	v->_float = strToF (string, &tail);

-	break;

-    }

-

-    if (tail == string)

-	return GL_FALSE; /* empty string (or containing only white-space) */

-  /* skip trailing white space */

-    if (*tail)

-	tail += strspn (tail, " \f\n\r\t\v");

-    if (*tail)

-	return GL_FALSE; /* something left over that is not part of value */

-

-    return GL_TRUE;

-}

-

-/** \brief Parse a list of ranges of type info->type. */

-static GLboolean parseRanges (driOptionInfo *info, const XML_Char *string) {

-    XML_Char *cp, *range;

-    GLuint nRanges, i;

-    driOptionRange *ranges;

-

-    XSTRDUP (cp, string);

-  /* pass 1: determine the number of ranges (number of commas + 1) */

-    range = cp;

-    for (nRanges = 1; *range; ++range)

-	if (*range == ',')

-	    ++nRanges;

-

-    if ((ranges = MALLOC (nRanges*sizeof(driOptionRange))) == NULL) {

-	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);

-	abort();

-    }

-

-  /* pass 2: parse all ranges into preallocated array */

-    range = cp;

-    for (i = 0; i < nRanges; ++i) {

-	XML_Char *end, *sep;

-	assert (range);

-	end = strchr (range, ',');

-	if (end)

-	    *end = '\0';

-	sep = strchr (range, ':');

-	if (sep) { /* non-empty interval */

-	    *sep = '\0';

-	    if (!parseValue (&ranges[i].start, info->type, range) ||

-		!parseValue (&ranges[i].end, info->type, sep+1))

-	        break;

-	    if (info->type == DRI_INT &&

-		ranges[i].start._int > ranges[i].end._int)

-		break;

-	    if (info->type == DRI_FLOAT &&

-		ranges[i].start._float > ranges[i].end._float)

-		break;

-	} else { /* empty interval */

-	    if (!parseValue (&ranges[i].start, info->type, range))

-		break;

-	    ranges[i].end = ranges[i].start;

-	}

-	if (end)

-	    range = end+1;

-	else

-	    range = NULL;

-    }

-    FREE (cp);

-    if (i < nRanges) {

-	FREE (ranges);

-	return GL_FALSE;

-    } else

-	assert (range == NULL);

-

-    info->nRanges = nRanges;

-    info->ranges = ranges;

-    return GL_TRUE;

-}

-

-/** \brief Check if a value is in one of info->ranges. */

-static GLboolean checkValue (const driOptionValue *v, const driOptionInfo *info) {

-    GLuint i;

-    assert (info->type != DRI_BOOL); /* should be caught by the parser */

-    if (info->nRanges == 0)

-	return GL_TRUE;

-    switch (info->type) {

-      case DRI_ENUM: /* enum is just a special integer */

-      case DRI_INT:

-	for (i = 0; i < info->nRanges; ++i)

-	    if (v->_int >= info->ranges[i].start._int &&

-		v->_int <= info->ranges[i].end._int)

-		return GL_TRUE;

-	break;

-      case DRI_FLOAT:

-	for (i = 0; i < info->nRanges; ++i)

-	    if (v->_float >= info->ranges[i].start._float &&

-		v->_float <= info->ranges[i].end._float)

-		return GL_TRUE;

-	break;

-      default:

-	assert (0); /* should never happen */

-    }

-    return GL_FALSE;

-}

-

-/** \brief Output a warning message. */

-#define XML_WARNING1(msg) do {\

-    __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \

-                      (int) XML_GetCurrentLineNumber(data->parser), \

-                      (int) XML_GetCurrentColumnNumber(data->parser)); \

-} while (0)

-#define XML_WARNING(msg,args...) do { \

-    __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \

-                      (int) XML_GetCurrentLineNumber(data->parser), \

-                      (int) XML_GetCurrentColumnNumber(data->parser), \

-                      args); \

-} while (0)

-/** \brief Output an error message. */

-#define XML_ERROR1(msg) do { \

-    __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \

-                      (int) XML_GetCurrentLineNumber(data->parser), \

-                      (int) XML_GetCurrentColumnNumber(data->parser)); \

-} while (0)

-#define XML_ERROR(msg,args...) do { \

-    __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \

-                      (int) XML_GetCurrentLineNumber(data->parser), \

-                      (int) XML_GetCurrentColumnNumber(data->parser), \

-                      args); \

-} while (0)

-/** \brief Output a fatal error message and abort. */

-#define XML_FATAL1(msg) do { \

-    fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \

-             data->name, \

-             (int) XML_GetCurrentLineNumber(data->parser),	\

-             (int) XML_GetCurrentColumnNumber(data->parser)); \

-    abort();\

-} while (0)

-#define XML_FATAL(msg,args...) do { \

-    fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \

-             data->name, \

-             (int) XML_GetCurrentLineNumber(data->parser),	\

-             (int) XML_GetCurrentColumnNumber(data->parser),		\

-             args); \

-    abort();\

-} while (0)

-

-/** \brief Parser context for __driConfigOptions. */

-struct OptInfoData {

-    const char *name;

-    XML_Parser parser;

-    driOptionCache *cache;

-    GLboolean inDriInfo;

-    GLboolean inSection;

-    GLboolean inDesc;

-    GLboolean inOption;

-    GLboolean inEnum;

-    int curOption;

-};

-

-/** \brief Elements in __driConfigOptions. */

-enum OptInfoElem {

-    OI_DESCRIPTION = 0, OI_DRIINFO, OI_ENUM, OI_OPTION, OI_SECTION, OI_COUNT

-};

-static const XML_Char *OptInfoElems[] = {

-    "description", "driinfo", "enum", "option", "section"

-};

-

-/** \brief Parse attributes of an enum element.

- *

- * We're not actually interested in the data. Just make sure this is ok

- * for external configuration tools.

- */

-static void parseEnumAttr (struct OptInfoData *data, const XML_Char **attr) {

-    GLuint i;

-    const XML_Char *value = NULL, *text = NULL;

-    driOptionValue v;

-    GLuint opt = data->curOption;

-    for (i = 0; attr[i]; i += 2) {

-	if (!strcmp (attr[i], "value")) value = attr[i+1];

-	else if (!strcmp (attr[i], "text")) text = attr[i+1];

-	else XML_FATAL("illegal enum attribute: %s.", attr[i]);

-    }

-    if (!value) XML_FATAL1 ("value attribute missing in enum.");

-    if (!text) XML_FATAL1 ("text attribute missing in enum.");

-     if (!parseValue (&v, data->cache->info[opt].type, value))

-	XML_FATAL ("illegal enum value: %s.", value);

-    if (!checkValue (&v, &data->cache->info[opt]))

-	XML_FATAL ("enum value out of valid range: %s.", value);

-}

-

-/** \brief Parse attributes of a description element.

- *

- * We're not actually interested in the data. Just make sure this is ok

- * for external configuration tools.

- */

-static void parseDescAttr (struct OptInfoData *data, const XML_Char **attr) {

-    GLuint i;

-    const XML_Char *lang = NULL, *text = NULL;

-    for (i = 0; attr[i]; i += 2) {

-	if (!strcmp (attr[i], "lang")) lang = attr[i+1];

-	else if (!strcmp (attr[i], "text")) text = attr[i+1];

-	else XML_FATAL("illegal description attribute: %s.", attr[i]);

-    }

-    if (!lang) XML_FATAL1 ("lang attribute missing in description.");

-    if (!text) XML_FATAL1 ("text attribute missing in description.");

-}

-

-/** \brief Parse attributes of an option element. */

-static void parseOptInfoAttr (struct OptInfoData *data, const XML_Char **attr) {

-    enum OptAttr {OA_DEFAULT = 0, OA_NAME, OA_TYPE, OA_VALID, OA_COUNT};

-    static const XML_Char *optAttr[] = {"default", "name", "type", "valid"};

-    const XML_Char *attrVal[OA_COUNT] = {NULL, NULL, NULL, NULL};

-    const char *defaultVal;

-    driOptionCache *cache = data->cache;

-    GLuint opt, i;

-    for (i = 0; attr[i]; i += 2) {

-	GLuint attrName = bsearchStr (attr[i], optAttr, OA_COUNT);

-	if (attrName >= OA_COUNT)

-	    XML_FATAL ("illegal option attribute: %s", attr[i]);

-	attrVal[attrName] = attr[i+1];

-    }

-    if (!attrVal[OA_NAME]) XML_FATAL1 ("name attribute missing in option.");

-    if (!attrVal[OA_TYPE]) XML_FATAL1 ("type attribute missing in option.");

-    if (!attrVal[OA_DEFAULT]) XML_FATAL1 ("default attribute missing in option.");

-

-    opt = findOption (cache, attrVal[OA_NAME]);

-    if (cache->info[opt].name)

-	XML_FATAL ("option %s redefined.", attrVal[OA_NAME]);

-    data->curOption = opt;

-

-    XSTRDUP (cache->info[opt].name, attrVal[OA_NAME]);

-

-    if (!strcmp (attrVal[OA_TYPE], "bool"))

-	cache->info[opt].type = DRI_BOOL;

-    else if (!strcmp (attrVal[OA_TYPE], "enum"))

-	cache->info[opt].type = DRI_ENUM;

-    else if (!strcmp (attrVal[OA_TYPE], "int"))

-	cache->info[opt].type = DRI_INT;

-    else if (!strcmp (attrVal[OA_TYPE], "float"))

-	cache->info[opt].type = DRI_FLOAT;

-    else

-	XML_FATAL ("illegal type in option: %s.", attrVal[OA_TYPE]);

-

-    defaultVal = getenv (cache->info[opt].name);

-    if (defaultVal != NULL) {

-      /* don't use XML_WARNING, we want the user to see this! */

-	fprintf (stderr,

-		 "ATTENTION: default value of option %s overridden by environment.\n",

-		 cache->info[opt].name);

-    } else

-	defaultVal = attrVal[OA_DEFAULT];

-    if (!parseValue (&cache->values[opt], cache->info[opt].type, defaultVal))

-	XML_FATAL ("illegal default value: %s.", defaultVal);

-

-    if (attrVal[OA_VALID]) {

-	if (cache->info[opt].type == DRI_BOOL)

-	    XML_FATAL1 ("boolean option with valid attribute.");

-	if (!parseRanges (&cache->info[opt], attrVal[OA_VALID]))

-	    XML_FATAL ("illegal valid attribute: %s.", attrVal[OA_VALID]);

-	if (!checkValue (&cache->values[opt], &cache->info[opt]))

-	    XML_FATAL ("default value out of valid range '%s': %s.",

-		       attrVal[OA_VALID], defaultVal);

-    } else if (cache->info[opt].type == DRI_ENUM) {

-	XML_FATAL1 ("valid attribute missing in option (mandatory for enums).");

-    } else {

-	cache->info[opt].nRanges = 0;

-	cache->info[opt].ranges = NULL;

-    }

-}

-

-/** \brief Handler for start element events. */

-static void optInfoStartElem (void *userData, const XML_Char *name,

-			      const XML_Char **attr) {

-    struct OptInfoData *data = (struct OptInfoData *)userData;

-    enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);

-    switch (elem) {

-      case OI_DRIINFO:

-	if (data->inDriInfo)

-	    XML_FATAL1 ("nested <driinfo> elements.");

-	if (attr[0])

-	    XML_FATAL1 ("attributes specified on <driinfo> element.");

-	data->inDriInfo = GL_TRUE;

-	break;

-      case OI_SECTION:

-	if (!data->inDriInfo)

-	    XML_FATAL1 ("<section> must be inside <driinfo>.");

-	if (data->inSection)

-	    XML_FATAL1 ("nested <section> elements.");

-	if (attr[0])

-	    XML_FATAL1 ("attributes specified on <section> element.");

-	data->inSection = GL_TRUE;

-	break;

-      case OI_DESCRIPTION:

-	if (!data->inSection && !data->inOption)

-	    XML_FATAL1 ("<description> must be inside <description> or <option.");

-	if (data->inDesc)

-	    XML_FATAL1 ("nested <description> elements.");

-	data->inDesc = GL_TRUE;

-	parseDescAttr (data, attr);

-	break;

-      case OI_OPTION:

-	if (!data->inSection)

-	    XML_FATAL1 ("<option> must be inside <section>.");

-	if (data->inDesc)

-	    XML_FATAL1 ("<option> nested in <description> element.");

-	if (data->inOption)

-	    XML_FATAL1 ("nested <option> elements.");

-	data->inOption = GL_TRUE;

-	parseOptInfoAttr (data, attr);

-	break;

-      case OI_ENUM:

-	if (!(data->inOption && data->inDesc))

-	    XML_FATAL1 ("<enum> must be inside <option> and <description>.");

-	if (data->inEnum)

-	    XML_FATAL1 ("nested <enum> elements.");

-	data->inEnum = GL_TRUE;

-	parseEnumAttr (data, attr);

-	break;

-      default:

-	XML_FATAL ("unknown element: %s.", name);

-    }

-}

-

-/** \brief Handler for end element events. */

-static void optInfoEndElem (void *userData, const XML_Char *name) {

-    struct OptInfoData *data = (struct OptInfoData *)userData;

-    enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);

-    switch (elem) {

-      case OI_DRIINFO:

-	data->inDriInfo = GL_FALSE;

-	break;

-      case OI_SECTION:

-	data->inSection = GL_FALSE;

-	break;

-      case OI_DESCRIPTION:

-	data->inDesc = GL_FALSE;

-	break;

-      case OI_OPTION:

-	data->inOption = GL_FALSE;

-	break;

-      case OI_ENUM:

-	data->inEnum = GL_FALSE;

-	break;

-      default:

-	assert (0); /* should have been caught by StartElem */

-    }

-}

-

-void driParseOptionInfo (driOptionCache *info,

-			 const char *configOptions, GLuint nConfigOptions) {

-    XML_Parser p;

-    int status;

-    struct OptInfoData userData;

-    struct OptInfoData *data = &userData;

-    GLuint realNoptions;

-

-  /* determine hash table size and allocate memory:

-   * 3/2 of the number of options, rounded up, so there remains always

-   * at least one free entry. This is needed for detecting undefined

-   * options in configuration files without getting a hash table overflow.

-   * Round this up to a power of two. */

-    GLuint minSize = (nConfigOptions*3 + 1) / 2;

-    GLuint size, log2size;

-    for (size = 1, log2size = 0; size < minSize; size <<= 1, ++log2size);

-    info->tableSize = log2size;

-    info->info = CALLOC (size * sizeof (driOptionInfo));

-    info->values = CALLOC (size * sizeof (driOptionValue));

-    if (info->info == NULL || info->values == NULL) {

-	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);

-	abort();

-    }

-

-    p = XML_ParserCreate ("UTF-8"); /* always UTF-8 */

-    XML_SetElementHandler (p, optInfoStartElem, optInfoEndElem);

-    XML_SetUserData (p, data);

-

-    userData.name = "__driConfigOptions";

-    userData.parser = p;

-    userData.cache = info;

-    userData.inDriInfo = GL_FALSE;

-    userData.inSection = GL_FALSE;

-    userData.inDesc = GL_FALSE;

-    userData.inOption = GL_FALSE;

-    userData.inEnum = GL_FALSE;

-    userData.curOption = -1;

-

-    status = XML_Parse (p, configOptions, strlen (configOptions), 1);

-    if (!status)

-	XML_FATAL ("%s.", XML_ErrorString(XML_GetErrorCode(p)));

-

-    XML_ParserFree (p);

-

-  /* Check if the actual number of options matches nConfigOptions.

-   * A mismatch is not fatal (a hash table overflow would be) but we

-   * want the driver developer's attention anyway. */

-    realNoptions = countOptions (info);

-    if (realNoptions != nConfigOptions) {

-	fprintf (stderr,

-		 "Error: nConfigOptions (%u) does not match the actual number of options in\n"

-		 "       __driConfigOptions (%u).\n",

-		 nConfigOptions, realNoptions);

-    }

-}

-

-/** \brief Parser context for configuration files. */

-struct OptConfData {

-    const char *name;

-    XML_Parser parser;

-    driOptionCache *cache;

-    GLint screenNum;

-    const char *driverName, *execName;

-    GLuint ignoringDevice;

-    GLuint ignoringApp;

-    GLuint inDriConf;

-    GLuint inDevice;

-    GLuint inApp;

-    GLuint inOption;

-};

-

-/** \brief Elements in configuration files. */

-enum OptConfElem {

-    OC_APPLICATION = 0, OC_DEVICE, OC_DRICONF, OC_OPTION, OC_COUNT

-};

-static const XML_Char *OptConfElems[] = {

-    "application", "device", "driconf", "option"

-};

-

-/** \brief Parse attributes of a device element. */

-static void parseDeviceAttr (struct OptConfData *data, const XML_Char **attr) {

-    GLuint i;

-    const XML_Char *driver = NULL, *screen = NULL;

-    for (i = 0; attr[i]; i += 2) {

-	if (!strcmp (attr[i], "driver")) driver = attr[i+1];

-	else if (!strcmp (attr[i], "screen")) screen = attr[i+1];

-	else XML_WARNING("unknown device attribute: %s.", attr[i]);

-    }

-    if (driver && strcmp (driver, data->driverName))

-	data->ignoringDevice = data->inDevice;

-    else if (screen) {

-	driOptionValue screenNum;

-	if (!parseValue (&screenNum, DRI_INT, screen))

-	    XML_WARNING("illegal screen number: %s.", screen);

-	else if (screenNum._int != data->screenNum)

-	    data->ignoringDevice = data->inDevice;

-    }

-}

-

-/** \brief Parse attributes of an application element. */

-static void parseAppAttr (struct OptConfData *data, const XML_Char **attr) {

-    GLuint i;

-    const XML_Char *name = NULL, *exec = NULL;

-    for (i = 0; attr[i]; i += 2) {

-	if (!strcmp (attr[i], "name")) name = attr[i+1];

-	else if (!strcmp (attr[i], "executable")) exec = attr[i+1];

-	else XML_WARNING("unknown application attribute: %s.", attr[i]);

-    }

-    if (exec && strcmp (exec, data->execName))

-	data->ignoringApp = data->inApp;

-}

-

-/** \brief Parse attributes of an option element. */

-static void parseOptConfAttr (struct OptConfData *data, const XML_Char **attr) {

-    GLuint i;

-    const XML_Char *name = NULL, *value = NULL;

-    for (i = 0; attr[i]; i += 2) {

-	if (!strcmp (attr[i], "name")) name = attr[i+1];

-	else if (!strcmp (attr[i], "value")) value = attr[i+1];

-	else XML_WARNING("unknown option attribute: %s.", attr[i]);

-    }

-    if (!name) XML_WARNING1 ("name attribute missing in option.");

-    if (!value) XML_WARNING1 ("value attribute missing in option.");

-    if (name && value) {

-	driOptionCache *cache = data->cache;

-	GLuint opt = findOption (cache, name);

-	if (cache->info[opt].name == NULL)

-	    XML_WARNING ("undefined option: %s.", name);

-	else if (getenv (cache->info[opt].name))

-	  /* don't use XML_WARNING, we want the user to see this! */

-	    fprintf (stderr, "ATTENTION: option value of option %s ignored.\n",

-		     cache->info[opt].name);

-	else if (!parseValue (&cache->values[opt], cache->info[opt].type, value))

-	    XML_WARNING ("illegal option value: %s.", value);

-    }

-}

-

-/** \brief Handler for start element events. */

-static void optConfStartElem (void *userData, const XML_Char *name,

-			      const XML_Char **attr) {

-    struct OptConfData *data = (struct OptConfData *)userData;

-    enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);

-    switch (elem) {

-      case OC_DRICONF:

-	if (data->inDriConf)

-	    XML_WARNING1 ("nested <driconf> elements.");

-	if (attr[0])

-	    XML_WARNING1 ("attributes specified on <driconf> element.");

-	data->inDriConf++;

-	break;

-      case OC_DEVICE:

-	if (!data->inDriConf)

-	    XML_WARNING1 ("<device> should be inside <driconf>.");

-	if (data->inDevice)

-	    XML_WARNING1 ("nested <device> elements.");

-	data->inDevice++;

-	if (!data->ignoringDevice && !data->ignoringApp)

-	    parseDeviceAttr (data, attr);

-	break;

-      case OC_APPLICATION:

-	if (!data->inDevice)

-	    XML_WARNING1 ("<application> should be inside <device>.");

-	if (data->inApp)

-	    XML_WARNING1 ("nested <application> elements.");

-	data->inApp++;

-	if (!data->ignoringDevice && !data->ignoringApp)

-	    parseAppAttr (data, attr);

-	break;

-      case OC_OPTION:

-	if (!data->inApp)

-	    XML_WARNING1 ("<option> should be inside <application>.");

-	if (data->inOption)

-	    XML_WARNING1 ("nested <option> elements.");

-	data->inOption++;

-	if (!data->ignoringDevice && !data->ignoringApp)

-	    parseOptConfAttr (data, attr);

-	break;

-      default:

-	XML_WARNING ("unknown element: %s.", name);

-    }

-}

-

-/** \brief Handler for end element events. */

-static void optConfEndElem (void *userData, const XML_Char *name) {

-    struct OptConfData *data = (struct OptConfData *)userData;

-    enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);

-    switch (elem) {

-      case OC_DRICONF:

-	data->inDriConf--;

-	break;

-      case OC_DEVICE:

-	if (data->inDevice-- == data->ignoringDevice)

-	    data->ignoringDevice = 0;

-	break;

-      case OC_APPLICATION:

-	if (data->inApp-- == data->ignoringApp)

-	    data->ignoringApp = 0;

-	break;

-      case OC_OPTION:

-	data->inOption--;

-	break;

-      default:

-	/* unknown element, warning was produced on start tag */;

-    }

-}

-

-/** \brief Initialize an option cache based on info */

-static void initOptionCache (driOptionCache *cache, const driOptionCache *info) {

-    cache->info = info->info;

-    cache->tableSize = info->tableSize;

-    cache->values = MALLOC ((1<<info->tableSize) * sizeof (driOptionValue));

-    if (cache->values == NULL) {

-	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);

-	abort();

-    }

-    memcpy (cache->values, info->values,

-	    (1<<info->tableSize) * sizeof (driOptionValue));

-}

-

-/** \brief Parse the named configuration file */

-static void parseOneConfigFile (XML_Parser p) {

-#define BUF_SIZE 0x1000

-    struct OptConfData *data = (struct OptConfData *)XML_GetUserData (p);

-    int status;

-    int fd;

-

-    if ((fd = open (data->name, O_RDONLY)) == -1) {

-	__driUtilMessage ("Can't open configuration file %s: %s.",

-			  data->name, strerror (errno));

-	return;

-    }

-

-    while (1) {

-	int bytesRead;

-	void *buffer = XML_GetBuffer (p, BUF_SIZE);

-	if (!buffer) {

-	    __driUtilMessage ("Can't allocate parser buffer.");

-	    break;

-	}

-	bytesRead = read (fd, buffer, BUF_SIZE);

-	if (bytesRead == -1) {

-	    __driUtilMessage ("Error reading from configuration file %s: %s.",

-			      data->name, strerror (errno));

-	    break;

-	}

-	status = XML_ParseBuffer (p, bytesRead, bytesRead == 0);

-	if (!status) {

-	    XML_ERROR ("%s.", XML_ErrorString(XML_GetErrorCode(p)));

-	    break;

-	}

-	if (bytesRead == 0)

-	    break;

-    }

-

-    close (fd);

-#undef BUF_SIZE

-}

-

-void driParseConfigFiles (driOptionCache *cache, const driOptionCache *info,

-			  GLint screenNum, const char *driverName) {

-    char *filenames[2] = {"/etc/drirc", NULL};

-    char *home;

-    GLuint i;

-    struct OptConfData userData;

-

-    initOptionCache (cache, info);

-

-    userData.cache = cache;

-    userData.screenNum = screenNum;

-    userData.driverName = driverName;

-    userData.execName = GET_PROGRAM_NAME();

-

-    if ((home = getenv ("HOME"))) {

-	GLuint len = strlen (home);

-	filenames[1] = MALLOC (len + 7+1);

-	if (filenames[1] == NULL)

-	    __driUtilMessage ("Can't allocate memory for %s/.drirc.", home);

-	else {

-	    memcpy (filenames[1], home, len);

-	    memcpy (filenames[1] + len, "/.drirc", 7+1);

-	}

-    }

-

-    for (i = 0; i < 2; ++i) {

-	XML_Parser p;

-	if (filenames[i] == NULL)

-	    continue;

-

-	p = XML_ParserCreate (NULL); /* use encoding specified by file */

-	XML_SetElementHandler (p, optConfStartElem, optConfEndElem);

-	XML_SetUserData (p, &userData);

-	userData.parser = p;

-	userData.name = filenames[i];

-	userData.ignoringDevice = 0;

-	userData.ignoringApp = 0;

-	userData.inDriConf = 0;

-	userData.inDevice = 0;

-	userData.inApp = 0;

-	userData.inOption = 0;

-

-	parseOneConfigFile (p);

-	XML_ParserFree (p);

-    }

-

-    if (filenames[1])

-	FREE (filenames[1]);

-}

-

-void driDestroyOptionInfo (driOptionCache *info) {

-    driDestroyOptionCache (info);

-    if (info->info) {

-	GLuint i, size = 1 << info->tableSize;

-	for (i = 0; i < size; ++i) {

-	    if (info->info[i].name) {

-		FREE (info->info[i].name);

-		if (info->info[i].ranges)

-		    FREE (info->info[i].ranges);

-	    }

-	}

-	FREE (info->info);

-    }

-}

-

-void driDestroyOptionCache (driOptionCache *cache) {

-    if (cache->values)

-	FREE (cache->values);

-}

-

-GLboolean driCheckOption (const driOptionCache *cache, const char *name,

-			  driOptionType type) {

-    GLuint i = findOption (cache, name);

-    return cache->info[i].name != NULL && cache->info[i].type == type;

-}

-

-GLboolean driQueryOptionb (const driOptionCache *cache, const char *name) {

-    GLuint i = findOption (cache, name);

-  /* make sure the option is defined and has the correct type */

-    assert (cache->info[i].name != NULL);

-    assert (cache->info[i].type == DRI_BOOL);

-    return cache->values[i]._bool;

-}

-

-GLint driQueryOptioni (const driOptionCache *cache, const char *name) {

-    GLuint i = findOption (cache, name);

-  /* make sure the option is defined and has the correct type */

-    assert (cache->info[i].name != NULL);

-    assert (cache->info[i].type == DRI_INT || cache->info[i].type == DRI_ENUM);

-    return cache->values[i]._int;

-}

-

-GLfloat driQueryOptionf (const driOptionCache *cache, const char *name) {

-    GLuint i = findOption (cache, name);

-  /* make sure the option is defined and has the correct type */

-    assert (cache->info[i].name != NULL);

-    assert (cache->info[i].type == DRI_FLOAT);

-    return cache->values[i]._float;

-}

+/*
+ * XML DRI client-side driver configuration
+ * Copyright (C) 2003 Felix Kuehling
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * FELIX KUEHLING, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ */
+/**
+ * \file xmlconfig.c
+ * \brief Driver-independent client-side part of the XML configuration
+ * \author Felix Kuehling
+ */
+
+#include "main/glheader.h"
+
+#include <string.h>
+#include <assert.h>
+#include <expat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include "main/imports.h"
+#include "utils.h"
+#include "xmlconfig.h"
+
+#undef GET_PROGRAM_NAME
+
+#if (defined(__GNU_LIBRARY__) || defined(__GLIBC__)) && !defined(__UCLIBC__)
+#    if !defined(__GLIBC__) || (__GLIBC__ < 2)
+/* These aren't declared in any libc5 header */
+extern char *program_invocation_name, *program_invocation_short_name;
+#    endif
+#    define GET_PROGRAM_NAME() program_invocation_short_name
+#elif defined(__FreeBSD__) && (__FreeBSD__ >= 2)
+#    include <osreldate.h>
+#    if (__FreeBSD_version >= 440000)
+#        include <stdlib.h>
+#        define GET_PROGRAM_NAME() getprogname()
+#    endif
+#elif defined(__NetBSD__) && defined(__NetBSD_Version) && (__NetBSD_Version >= 106000100)
+#    include <stdlib.h>
+#    define GET_PROGRAM_NAME() getprogname()
+#elif defined(__APPLE__)
+#    include <stdlib.h>
+#    define GET_PROGRAM_NAME() getprogname()
+#elif defined(__sun)
+/* Solaris has getexecname() which returns the full path - return just
+   the basename to match BSD getprogname() */
+#    include <stdlib.h>
+#    include <libgen.h>
+
+static const char *__getProgramName () {
+    static const char *progname;
+
+    if (progname == NULL) {
+	const char *e = getexecname();
+	if (e != NULL) {
+	    /* Have to make a copy since getexecname can return a readonly
+	       string, but basename expects to be able to modify its arg. */
+	    char *n = strdup(e);
+	    if (n != NULL) {
+		progname = basename(n);
+	    }
+	}
+    }
+    return progname;
+}
+
+#    define GET_PROGRAM_NAME() __getProgramName()
+#endif
+
+#if !defined(GET_PROGRAM_NAME)
+#    if defined(__OpenBSD__) || defined(NetBSD) || defined(__UCLIBC__)
+/* This is a hack. It's said to work on OpenBSD, NetBSD and GNU.
+ * Rogelio M.Serrano Jr. reported it's also working with UCLIBC. It's
+ * used as a last resort, if there is no documented facility available. */
+static const char *__getProgramName () {
+    extern const char *__progname;
+    char * arg = strrchr(__progname, '/');
+    if (arg)
+        return arg+1;
+    else
+        return __progname;
+}
+#        define GET_PROGRAM_NAME() __getProgramName()
+#    else
+#        define GET_PROGRAM_NAME() ""
+#        warning "Per application configuration won't work with your OS version."
+#    endif
+#endif
+
+/** \brief Find an option in an option cache with the name as key */
+static GLuint findOption (const driOptionCache *cache, const char *name) {
+    GLuint len = strlen (name);
+    GLuint size = 1 << cache->tableSize, mask = size - 1;
+    GLuint hash = 0;
+    GLuint i, shift;
+
+  /* compute a hash from the variable length name */
+    for (i = 0, shift = 0; i < len; ++i, shift = (shift+8) & 31)
+	hash += (GLuint)name[i] << shift;
+    hash *= hash;
+    hash = (hash >> (16-cache->tableSize/2)) & mask;
+
+  /* this is just the starting point of the linear search for the option */
+    for (i = 0; i < size; ++i, hash = (hash+1) & mask) {
+      /* if we hit an empty entry then the option is not defined (yet) */
+	if (cache->info[hash].name == 0)
+	    break;
+	else if (!strcmp (name, cache->info[hash].name))
+	    break;
+    }
+  /* this assertion fails if the hash table is full */
+    assert (i < size);
+
+    return hash;
+}
+
+/** \brief Count the real number of options in an option cache */
+static GLuint countOptions (const driOptionCache *cache) {
+    GLuint size = 1 << cache->tableSize;
+    GLuint i, count = 0;
+    for (i = 0; i < size; ++i)
+	if (cache->info[i].name)
+	    count++;
+    return count;
+}
+
+/** \brief Like strdup but using MALLOC and with error checking. */
+#define XSTRDUP(dest,source) do { \
+    GLuint len = strlen (source); \
+    if (!(dest = MALLOC (len+1))) { \
+	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__); \
+	abort(); \
+    } \
+    memcpy (dest, source, len+1); \
+} while (0)
+
+static int compare (const void *a, const void *b) {
+    return strcmp (*(char *const*)a, *(char *const*)b);
+}
+/** \brief Binary search in a string array. */
+static GLuint bsearchStr (const XML_Char *name,
+			  const XML_Char *elems[], GLuint count) {
+    const XML_Char **found;
+    found = bsearch (&name, elems, count, sizeof (XML_Char *), compare);
+    if (found)
+	return found - elems;
+    else
+	return count;
+}
+
+/** \brief Locale-independent integer parser.
+ *
+ * Works similar to strtol. Leading space is NOT skipped. The input
+ * number may have an optional sign. Radix is specified by base. If
+ * base is 0 then decimal is assumed unless the input number is
+ * prefixed by 0x or 0X for hexadecimal or 0 for octal. After
+ * returning tail points to the first character that is not part of
+ * the integer number. If no number was found then tail points to the
+ * start of the input string. */
+static GLint strToI (const XML_Char *string, const XML_Char **tail, int base) {
+    GLint radix = base == 0 ? 10 : base;
+    GLint result = 0;
+    GLint sign = 1;
+    GLboolean numberFound = GL_FALSE;
+    const XML_Char *start = string;
+
+    assert (radix >= 2 && radix <= 36);
+
+    if (*string == '-') {
+	sign = -1;
+	string++;
+    } else if (*string == '+')
+	string++;
+    if (base == 0 && *string == '0') {
+	numberFound = GL_TRUE; 
+	if (*(string+1) == 'x' || *(string+1) == 'X') {
+	    radix = 16;
+	    string += 2;
+	} else {
+	    radix = 8;
+	    string++;
+	}
+    }
+    do {
+	GLint digit = -1;
+	if (radix <= 10) {
+	    if (*string >= '0' && *string < '0' + radix)
+		digit = *string - '0';
+	} else {
+	    if (*string >= '0' && *string <= '9')
+		digit = *string - '0';
+	    else if (*string >= 'a' && *string < 'a' + radix - 10)
+		digit = *string - 'a' + 10;
+	    else if (*string >= 'A' && *string < 'A' + radix - 10)
+		digit = *string - 'A' + 10;
+	}
+	if (digit != -1) {
+	    numberFound = GL_TRUE;
+	    result = radix*result + digit;
+	    string++;
+	} else
+	    break;
+    } while (GL_TRUE);
+    *tail = numberFound ? string : start;
+    return sign * result;
+}
+
+/** \brief Locale-independent floating-point parser.
+ *
+ * Works similar to strtod. Leading space is NOT skipped. The input
+ * number may have an optional sign. '.' is interpreted as decimal
+ * point and may occur at most once. Optionally the number may end in
+ * [eE]<exponent>, where <exponent> is an integer as recognized by
+ * strToI. In that case the result is number * 10^exponent. After
+ * returning tail points to the first character that is not part of
+ * the floating point number. If no number was found then tail points
+ * to the start of the input string.
+ *
+ * Uses two passes for maximum accuracy. */
+static GLfloat strToF (const XML_Char *string, const XML_Char **tail) {
+    GLint nDigits = 0, pointPos, exponent;
+    GLfloat sign = 1.0f, result = 0.0f, scale;
+    const XML_Char *start = string, *numStart;
+
+    /* sign */
+    if (*string == '-') {
+	sign = -1.0f;
+	string++;
+    } else if (*string == '+')
+	string++;
+
+    /* first pass: determine position of decimal point, number of
+     * digits, exponent and the end of the number. */
+    numStart = string;
+    while (*string >= '0' && *string <= '9') {
+	string++;
+	nDigits++;
+    }
+    pointPos = nDigits;
+    if (*string == '.') {
+	string++;
+	while (*string >= '0' && *string <= '9') {
+	    string++;
+	    nDigits++;
+	}
+    }
+    if (nDigits == 0) {
+	/* no digits, no number */
+	*tail = start;
+	return 0.0f;
+    }
+    *tail = string;
+    if (*string == 'e' || *string == 'E') {
+	const XML_Char *expTail;
+	exponent = strToI (string+1, &expTail, 10);
+	if (expTail == string+1)
+	    exponent = 0;
+	else
+	    *tail = expTail;
+    } else
+	exponent = 0;
+    string = numStart;
+
+    /* scale of the first digit */
+    scale = sign * (GLfloat)pow (10.0, (GLdouble)(pointPos-1 + exponent));
+
+    /* second pass: parse digits */
+    do {
+	if (*string != '.') {
+	    assert (*string >= '0' && *string <= '9');
+	    result += scale * (GLfloat)(*string - '0');
+	    scale *= 0.1f;
+	    nDigits--;
+	}
+	string++;
+    } while (nDigits > 0);
+
+    return result;
+}
+
+/** \brief Parse a value of a given type. */
+static GLboolean parseValue (driOptionValue *v, driOptionType type,
+			     const XML_Char *string) {
+    const XML_Char *tail = NULL;
+  /* skip leading white-space */
+    string += strspn (string, " \f\n\r\t\v");
+    switch (type) {
+      case DRI_BOOL:
+	if (!strcmp (string, "false")) {
+	    v->_bool = GL_FALSE;
+	    tail = string + 5;
+	} else if (!strcmp (string, "true")) {
+	    v->_bool = GL_TRUE;
+	    tail = string + 4;
+	}
+	else
+	    return GL_FALSE;
+	break;
+      case DRI_ENUM: /* enum is just a special integer */
+      case DRI_INT:
+	v->_int = strToI (string, &tail, 0);
+	break;
+      case DRI_FLOAT:
+	v->_float = strToF (string, &tail);
+	break;
+    }
+
+    if (tail == string)
+	return GL_FALSE; /* empty string (or containing only white-space) */
+  /* skip trailing white space */
+    if (*tail)
+	tail += strspn (tail, " \f\n\r\t\v");
+    if (*tail)
+	return GL_FALSE; /* something left over that is not part of value */
+
+    return GL_TRUE;
+}
+
+/** \brief Parse a list of ranges of type info->type. */
+static GLboolean parseRanges (driOptionInfo *info, const XML_Char *string) {
+    XML_Char *cp, *range;
+    GLuint nRanges, i;
+    driOptionRange *ranges;
+
+    XSTRDUP (cp, string);
+  /* pass 1: determine the number of ranges (number of commas + 1) */
+    range = cp;
+    for (nRanges = 1; *range; ++range)
+	if (*range == ',')
+	    ++nRanges;
+
+    if ((ranges = MALLOC (nRanges*sizeof(driOptionRange))) == NULL) {
+	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
+	abort();
+    }
+
+  /* pass 2: parse all ranges into preallocated array */
+    range = cp;
+    for (i = 0; i < nRanges; ++i) {
+	XML_Char *end, *sep;
+	assert (range);
+	end = strchr (range, ',');
+	if (end)
+	    *end = '\0';
+	sep = strchr (range, ':');
+	if (sep) { /* non-empty interval */
+	    *sep = '\0';
+	    if (!parseValue (&ranges[i].start, info->type, range) ||
+		!parseValue (&ranges[i].end, info->type, sep+1))
+	        break;
+	    if (info->type == DRI_INT &&
+		ranges[i].start._int > ranges[i].end._int)
+		break;
+	    if (info->type == DRI_FLOAT &&
+		ranges[i].start._float > ranges[i].end._float)
+		break;
+	} else { /* empty interval */
+	    if (!parseValue (&ranges[i].start, info->type, range))
+		break;
+	    ranges[i].end = ranges[i].start;
+	}
+	if (end)
+	    range = end+1;
+	else
+	    range = NULL;
+    }
+    FREE (cp);
+    if (i < nRanges) {
+	FREE (ranges);
+	return GL_FALSE;
+    } else
+	assert (range == NULL);
+
+    info->nRanges = nRanges;
+    info->ranges = ranges;
+    return GL_TRUE;
+}
+
+/** \brief Check if a value is in one of info->ranges. */
+static GLboolean checkValue (const driOptionValue *v, const driOptionInfo *info) {
+    GLuint i;
+    assert (info->type != DRI_BOOL); /* should be caught by the parser */
+    if (info->nRanges == 0)
+	return GL_TRUE;
+    switch (info->type) {
+      case DRI_ENUM: /* enum is just a special integer */
+      case DRI_INT:
+	for (i = 0; i < info->nRanges; ++i)
+	    if (v->_int >= info->ranges[i].start._int &&
+		v->_int <= info->ranges[i].end._int)
+		return GL_TRUE;
+	break;
+      case DRI_FLOAT:
+	for (i = 0; i < info->nRanges; ++i)
+	    if (v->_float >= info->ranges[i].start._float &&
+		v->_float <= info->ranges[i].end._float)
+		return GL_TRUE;
+	break;
+      default:
+	assert (0); /* should never happen */
+    }
+    return GL_FALSE;
+}
+
+/** \brief Output a warning message. */
+#define XML_WARNING1(msg) do {\
+    __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
+                      (int) XML_GetCurrentLineNumber(data->parser), \
+                      (int) XML_GetCurrentColumnNumber(data->parser)); \
+} while (0)
+#define XML_WARNING(msg,args...) do { \
+    __driUtilMessage ("Warning in %s line %d, column %d: "msg, data->name, \
+                      (int) XML_GetCurrentLineNumber(data->parser), \
+                      (int) XML_GetCurrentColumnNumber(data->parser), \
+                      args); \
+} while (0)
+/** \brief Output an error message. */
+#define XML_ERROR1(msg) do { \
+    __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
+                      (int) XML_GetCurrentLineNumber(data->parser), \
+                      (int) XML_GetCurrentColumnNumber(data->parser)); \
+} while (0)
+#define XML_ERROR(msg,args...) do { \
+    __driUtilMessage ("Error in %s line %d, column %d: "msg, data->name, \
+                      (int) XML_GetCurrentLineNumber(data->parser), \
+                      (int) XML_GetCurrentColumnNumber(data->parser), \
+                      args); \
+} while (0)
+/** \brief Output a fatal error message and abort. */
+#define XML_FATAL1(msg) do { \
+    fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
+             data->name, \
+             (int) XML_GetCurrentLineNumber(data->parser),	\
+             (int) XML_GetCurrentColumnNumber(data->parser)); \
+    abort();\
+} while (0)
+#define XML_FATAL(msg,args...) do { \
+    fprintf (stderr, "Fatal error in %s line %d, column %d: "msg"\n", \
+             data->name, \
+             (int) XML_GetCurrentLineNumber(data->parser),	\
+             (int) XML_GetCurrentColumnNumber(data->parser),		\
+             args); \
+    abort();\
+} while (0)
+
+/** \brief Parser context for __driConfigOptions. */
+struct OptInfoData {
+    const char *name;
+    XML_Parser parser;
+    driOptionCache *cache;
+    GLboolean inDriInfo;
+    GLboolean inSection;
+    GLboolean inDesc;
+    GLboolean inOption;
+    GLboolean inEnum;
+    int curOption;
+};
+
+/** \brief Elements in __driConfigOptions. */
+enum OptInfoElem {
+    OI_DESCRIPTION = 0, OI_DRIINFO, OI_ENUM, OI_OPTION, OI_SECTION, OI_COUNT
+};
+static const XML_Char *OptInfoElems[] = {
+    "description", "driinfo", "enum", "option", "section"
+};
+
+/** \brief Parse attributes of an enum element.
+ *
+ * We're not actually interested in the data. Just make sure this is ok
+ * for external configuration tools.
+ */
+static void parseEnumAttr (struct OptInfoData *data, const XML_Char **attr) {
+    GLuint i;
+    const XML_Char *value = NULL, *text = NULL;
+    driOptionValue v;
+    GLuint opt = data->curOption;
+    for (i = 0; attr[i]; i += 2) {
+	if (!strcmp (attr[i], "value")) value = attr[i+1];
+	else if (!strcmp (attr[i], "text")) text = attr[i+1];
+	else XML_FATAL("illegal enum attribute: %s.", attr[i]);
+    }
+    if (!value) XML_FATAL1 ("value attribute missing in enum.");
+    if (!text) XML_FATAL1 ("text attribute missing in enum.");
+     if (!parseValue (&v, data->cache->info[opt].type, value))
+	XML_FATAL ("illegal enum value: %s.", value);
+    if (!checkValue (&v, &data->cache->info[opt]))
+	XML_FATAL ("enum value out of valid range: %s.", value);
+}
+
+/** \brief Parse attributes of a description element.
+ *
+ * We're not actually interested in the data. Just make sure this is ok
+ * for external configuration tools.
+ */
+static void parseDescAttr (struct OptInfoData *data, const XML_Char **attr) {
+    GLuint i;
+    const XML_Char *lang = NULL, *text = NULL;
+    for (i = 0; attr[i]; i += 2) {
+	if (!strcmp (attr[i], "lang")) lang = attr[i+1];
+	else if (!strcmp (attr[i], "text")) text = attr[i+1];
+	else XML_FATAL("illegal description attribute: %s.", attr[i]);
+    }
+    if (!lang) XML_FATAL1 ("lang attribute missing in description.");
+    if (!text) XML_FATAL1 ("text attribute missing in description.");
+}
+
+/** \brief Parse attributes of an option element. */
+static void parseOptInfoAttr (struct OptInfoData *data, const XML_Char **attr) {
+    enum OptAttr {OA_DEFAULT = 0, OA_NAME, OA_TYPE, OA_VALID, OA_COUNT};
+    static const XML_Char *optAttr[] = {"default", "name", "type", "valid"};
+    const XML_Char *attrVal[OA_COUNT] = {NULL, NULL, NULL, NULL};
+    const char *defaultVal;
+    driOptionCache *cache = data->cache;
+    GLuint opt, i;
+    for (i = 0; attr[i]; i += 2) {
+	GLuint attrName = bsearchStr (attr[i], optAttr, OA_COUNT);
+	if (attrName >= OA_COUNT)
+	    XML_FATAL ("illegal option attribute: %s", attr[i]);
+	attrVal[attrName] = attr[i+1];
+    }
+    if (!attrVal[OA_NAME]) XML_FATAL1 ("name attribute missing in option.");
+    if (!attrVal[OA_TYPE]) XML_FATAL1 ("type attribute missing in option.");
+    if (!attrVal[OA_DEFAULT]) XML_FATAL1 ("default attribute missing in option.");
+
+    opt = findOption (cache, attrVal[OA_NAME]);
+    if (cache->info[opt].name)
+	XML_FATAL ("option %s redefined.", attrVal[OA_NAME]);
+    data->curOption = opt;
+
+    XSTRDUP (cache->info[opt].name, attrVal[OA_NAME]);
+
+    if (!strcmp (attrVal[OA_TYPE], "bool"))
+	cache->info[opt].type = DRI_BOOL;
+    else if (!strcmp (attrVal[OA_TYPE], "enum"))
+	cache->info[opt].type = DRI_ENUM;
+    else if (!strcmp (attrVal[OA_TYPE], "int"))
+	cache->info[opt].type = DRI_INT;
+    else if (!strcmp (attrVal[OA_TYPE], "float"))
+	cache->info[opt].type = DRI_FLOAT;
+    else
+	XML_FATAL ("illegal type in option: %s.", attrVal[OA_TYPE]);
+
+    defaultVal = getenv (cache->info[opt].name);
+    if (defaultVal != NULL) {
+      /* don't use XML_WARNING, we want the user to see this! */
+	fprintf (stderr,
+		 "ATTENTION: default value of option %s overridden by environment.\n",
+		 cache->info[opt].name);
+    } else
+	defaultVal = attrVal[OA_DEFAULT];
+    if (!parseValue (&cache->values[opt], cache->info[opt].type, defaultVal))
+	XML_FATAL ("illegal default value: %s.", defaultVal);
+
+    if (attrVal[OA_VALID]) {
+	if (cache->info[opt].type == DRI_BOOL)
+	    XML_FATAL1 ("boolean option with valid attribute.");
+	if (!parseRanges (&cache->info[opt], attrVal[OA_VALID]))
+	    XML_FATAL ("illegal valid attribute: %s.", attrVal[OA_VALID]);
+	if (!checkValue (&cache->values[opt], &cache->info[opt]))
+	    XML_FATAL ("default value out of valid range '%s': %s.",
+		       attrVal[OA_VALID], defaultVal);
+    } else if (cache->info[opt].type == DRI_ENUM) {
+	XML_FATAL1 ("valid attribute missing in option (mandatory for enums).");
+    } else {
+	cache->info[opt].nRanges = 0;
+	cache->info[opt].ranges = NULL;
+    }
+}
+
+/** \brief Handler for start element events. */
+static void optInfoStartElem (void *userData, const XML_Char *name,
+			      const XML_Char **attr) {
+    struct OptInfoData *data = (struct OptInfoData *)userData;
+    enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
+    switch (elem) {
+      case OI_DRIINFO:
+	if (data->inDriInfo)
+	    XML_FATAL1 ("nested <driinfo> elements.");
+	if (attr[0])
+	    XML_FATAL1 ("attributes specified on <driinfo> element.");
+	data->inDriInfo = GL_TRUE;
+	break;
+      case OI_SECTION:
+	if (!data->inDriInfo)
+	    XML_FATAL1 ("<section> must be inside <driinfo>.");
+	if (data->inSection)
+	    XML_FATAL1 ("nested <section> elements.");
+	if (attr[0])
+	    XML_FATAL1 ("attributes specified on <section> element.");
+	data->inSection = GL_TRUE;
+	break;
+      case OI_DESCRIPTION:
+	if (!data->inSection && !data->inOption)
+	    XML_FATAL1 ("<description> must be inside <description> or <option.");
+	if (data->inDesc)
+	    XML_FATAL1 ("nested <description> elements.");
+	data->inDesc = GL_TRUE;
+	parseDescAttr (data, attr);
+	break;
+      case OI_OPTION:
+	if (!data->inSection)
+	    XML_FATAL1 ("<option> must be inside <section>.");
+	if (data->inDesc)
+	    XML_FATAL1 ("<option> nested in <description> element.");
+	if (data->inOption)
+	    XML_FATAL1 ("nested <option> elements.");
+	data->inOption = GL_TRUE;
+	parseOptInfoAttr (data, attr);
+	break;
+      case OI_ENUM:
+	if (!(data->inOption && data->inDesc))
+	    XML_FATAL1 ("<enum> must be inside <option> and <description>.");
+	if (data->inEnum)
+	    XML_FATAL1 ("nested <enum> elements.");
+	data->inEnum = GL_TRUE;
+	parseEnumAttr (data, attr);
+	break;
+      default:
+	XML_FATAL ("unknown element: %s.", name);
+    }
+}
+
+/** \brief Handler for end element events. */
+static void optInfoEndElem (void *userData, const XML_Char *name) {
+    struct OptInfoData *data = (struct OptInfoData *)userData;
+    enum OptInfoElem elem = bsearchStr (name, OptInfoElems, OI_COUNT);
+    switch (elem) {
+      case OI_DRIINFO:
+	data->inDriInfo = GL_FALSE;
+	break;
+      case OI_SECTION:
+	data->inSection = GL_FALSE;
+	break;
+      case OI_DESCRIPTION:
+	data->inDesc = GL_FALSE;
+	break;
+      case OI_OPTION:
+	data->inOption = GL_FALSE;
+	break;
+      case OI_ENUM:
+	data->inEnum = GL_FALSE;
+	break;
+      default:
+	assert (0); /* should have been caught by StartElem */
+    }
+}
+
+void driParseOptionInfo (driOptionCache *info,
+			 const char *configOptions, GLuint nConfigOptions) {
+    XML_Parser p;
+    int status;
+    struct OptInfoData userData;
+    struct OptInfoData *data = &userData;
+    GLuint realNoptions;
+
+  /* determine hash table size and allocate memory:
+   * 3/2 of the number of options, rounded up, so there remains always
+   * at least one free entry. This is needed for detecting undefined
+   * options in configuration files without getting a hash table overflow.
+   * Round this up to a power of two. */
+    GLuint minSize = (nConfigOptions*3 + 1) / 2;
+    GLuint size, log2size;
+    for (size = 1, log2size = 0; size < minSize; size <<= 1, ++log2size);
+    info->tableSize = log2size;
+    info->info = CALLOC (size * sizeof (driOptionInfo));
+    info->values = CALLOC (size * sizeof (driOptionValue));
+    if (info->info == NULL || info->values == NULL) {
+	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
+	abort();
+    }
+
+    p = XML_ParserCreate ("UTF-8"); /* always UTF-8 */
+    XML_SetElementHandler (p, optInfoStartElem, optInfoEndElem);
+    XML_SetUserData (p, data);
+
+    userData.name = "__driConfigOptions";
+    userData.parser = p;
+    userData.cache = info;
+    userData.inDriInfo = GL_FALSE;
+    userData.inSection = GL_FALSE;
+    userData.inDesc = GL_FALSE;
+    userData.inOption = GL_FALSE;
+    userData.inEnum = GL_FALSE;
+    userData.curOption = -1;
+
+    status = XML_Parse (p, configOptions, strlen (configOptions), 1);
+    if (!status)
+	XML_FATAL ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
+
+    XML_ParserFree (p);
+
+  /* Check if the actual number of options matches nConfigOptions.
+   * A mismatch is not fatal (a hash table overflow would be) but we
+   * want the driver developer's attention anyway. */
+    realNoptions = countOptions (info);
+    if (realNoptions != nConfigOptions) {
+	fprintf (stderr,
+		 "Error: nConfigOptions (%u) does not match the actual number of options in\n"
+		 "       __driConfigOptions (%u).\n",
+		 nConfigOptions, realNoptions);
+    }
+}
+
+/** \brief Parser context for configuration files. */
+struct OptConfData {
+    const char *name;
+    XML_Parser parser;
+    driOptionCache *cache;
+    GLint screenNum;
+    const char *driverName, *execName;
+    GLuint ignoringDevice;
+    GLuint ignoringApp;
+    GLuint inDriConf;
+    GLuint inDevice;
+    GLuint inApp;
+    GLuint inOption;
+};
+
+/** \brief Elements in configuration files. */
+enum OptConfElem {
+    OC_APPLICATION = 0, OC_DEVICE, OC_DRICONF, OC_OPTION, OC_COUNT
+};
+static const XML_Char *OptConfElems[] = {
+    "application", "device", "driconf", "option"
+};
+
+/** \brief Parse attributes of a device element. */
+static void parseDeviceAttr (struct OptConfData *data, const XML_Char **attr) {
+    GLuint i;
+    const XML_Char *driver = NULL, *screen = NULL;
+    for (i = 0; attr[i]; i += 2) {
+	if (!strcmp (attr[i], "driver")) driver = attr[i+1];
+	else if (!strcmp (attr[i], "screen")) screen = attr[i+1];
+	else XML_WARNING("unknown device attribute: %s.", attr[i]);
+    }
+    if (driver && strcmp (driver, data->driverName))
+	data->ignoringDevice = data->inDevice;
+    else if (screen) {
+	driOptionValue screenNum;
+	if (!parseValue (&screenNum, DRI_INT, screen))
+	    XML_WARNING("illegal screen number: %s.", screen);
+	else if (screenNum._int != data->screenNum)
+	    data->ignoringDevice = data->inDevice;
+    }
+}
+
+/** \brief Parse attributes of an application element. */
+static void parseAppAttr (struct OptConfData *data, const XML_Char **attr) {
+    GLuint i;
+    const XML_Char *exec = NULL;
+    for (i = 0; attr[i]; i += 2) {
+	if (!strcmp (attr[i], "name")) /* not needed here */;
+	else if (!strcmp (attr[i], "executable")) exec = attr[i+1];
+	else XML_WARNING("unknown application attribute: %s.", attr[i]);
+    }
+    if (exec && strcmp (exec, data->execName))
+	data->ignoringApp = data->inApp;
+}
+
+/** \brief Parse attributes of an option element. */
+static void parseOptConfAttr (struct OptConfData *data, const XML_Char **attr) {
+    GLuint i;
+    const XML_Char *name = NULL, *value = NULL;
+    for (i = 0; attr[i]; i += 2) {
+	if (!strcmp (attr[i], "name")) name = attr[i+1];
+	else if (!strcmp (attr[i], "value")) value = attr[i+1];
+	else XML_WARNING("unknown option attribute: %s.", attr[i]);
+    }
+    if (!name) XML_WARNING1 ("name attribute missing in option.");
+    if (!value) XML_WARNING1 ("value attribute missing in option.");
+    if (name && value) {
+	driOptionCache *cache = data->cache;
+	GLuint opt = findOption (cache, name);
+	if (cache->info[opt].name == NULL)
+	    XML_WARNING ("undefined option: %s.", name);
+	else if (getenv (cache->info[opt].name))
+	  /* don't use XML_WARNING, we want the user to see this! */
+	    fprintf (stderr, "ATTENTION: option value of option %s ignored.\n",
+		     cache->info[opt].name);
+	else if (!parseValue (&cache->values[opt], cache->info[opt].type, value))
+	    XML_WARNING ("illegal option value: %s.", value);
+    }
+}
+
+/** \brief Handler for start element events. */
+static void optConfStartElem (void *userData, const XML_Char *name,
+			      const XML_Char **attr) {
+    struct OptConfData *data = (struct OptConfData *)userData;
+    enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
+    switch (elem) {
+      case OC_DRICONF:
+	if (data->inDriConf)
+	    XML_WARNING1 ("nested <driconf> elements.");
+	if (attr[0])
+	    XML_WARNING1 ("attributes specified on <driconf> element.");
+	data->inDriConf++;
+	break;
+      case OC_DEVICE:
+	if (!data->inDriConf)
+	    XML_WARNING1 ("<device> should be inside <driconf>.");
+	if (data->inDevice)
+	    XML_WARNING1 ("nested <device> elements.");
+	data->inDevice++;
+	if (!data->ignoringDevice && !data->ignoringApp)
+	    parseDeviceAttr (data, attr);
+	break;
+      case OC_APPLICATION:
+	if (!data->inDevice)
+	    XML_WARNING1 ("<application> should be inside <device>.");
+	if (data->inApp)
+	    XML_WARNING1 ("nested <application> elements.");
+	data->inApp++;
+	if (!data->ignoringDevice && !data->ignoringApp)
+	    parseAppAttr (data, attr);
+	break;
+      case OC_OPTION:
+	if (!data->inApp)
+	    XML_WARNING1 ("<option> should be inside <application>.");
+	if (data->inOption)
+	    XML_WARNING1 ("nested <option> elements.");
+	data->inOption++;
+	if (!data->ignoringDevice && !data->ignoringApp)
+	    parseOptConfAttr (data, attr);
+	break;
+      default:
+	XML_WARNING ("unknown element: %s.", name);
+    }
+}
+
+/** \brief Handler for end element events. */
+static void optConfEndElem (void *userData, const XML_Char *name) {
+    struct OptConfData *data = (struct OptConfData *)userData;
+    enum OptConfElem elem = bsearchStr (name, OptConfElems, OC_COUNT);
+    switch (elem) {
+      case OC_DRICONF:
+	data->inDriConf--;
+	break;
+      case OC_DEVICE:
+	if (data->inDevice-- == data->ignoringDevice)
+	    data->ignoringDevice = 0;
+	break;
+      case OC_APPLICATION:
+	if (data->inApp-- == data->ignoringApp)
+	    data->ignoringApp = 0;
+	break;
+      case OC_OPTION:
+	data->inOption--;
+	break;
+      default:
+	/* unknown element, warning was produced on start tag */;
+    }
+}
+
+/** \brief Initialize an option cache based on info */
+static void initOptionCache (driOptionCache *cache, const driOptionCache *info) {
+    cache->info = info->info;
+    cache->tableSize = info->tableSize;
+    cache->values = MALLOC ((1<<info->tableSize) * sizeof (driOptionValue));
+    if (cache->values == NULL) {
+	fprintf (stderr, "%s: %d: out of memory.\n", __FILE__, __LINE__);
+	abort();
+    }
+    memcpy (cache->values, info->values,
+	    (1<<info->tableSize) * sizeof (driOptionValue));
+}
+
+/** \brief Parse the named configuration file */
+static void parseOneConfigFile (XML_Parser p) {
+#define BUF_SIZE 0x1000
+    struct OptConfData *data = (struct OptConfData *)XML_GetUserData (p);
+    int status;
+    int fd;
+
+    if ((fd = open (data->name, O_RDONLY)) == -1) {
+	__driUtilMessage ("Can't open configuration file %s: %s.",
+			  data->name, strerror (errno));
+	return;
+    }
+
+    while (1) {
+	int bytesRead;
+	void *buffer = XML_GetBuffer (p, BUF_SIZE);
+	if (!buffer) {
+	    __driUtilMessage ("Can't allocate parser buffer.");
+	    break;
+	}
+	bytesRead = read (fd, buffer, BUF_SIZE);
+	if (bytesRead == -1) {
+	    __driUtilMessage ("Error reading from configuration file %s: %s.",
+			      data->name, strerror (errno));
+	    break;
+	}
+	status = XML_ParseBuffer (p, bytesRead, bytesRead == 0);
+	if (!status) {
+	    XML_ERROR ("%s.", XML_ErrorString(XML_GetErrorCode(p)));
+	    break;
+	}
+	if (bytesRead == 0)
+	    break;
+    }
+
+    close (fd);
+#undef BUF_SIZE
+}
+
+void driParseConfigFiles (driOptionCache *cache, const driOptionCache *info,
+			  GLint screenNum, const char *driverName) {
+    char *filenames[2] = {"/etc/drirc", NULL};
+    char *home;
+    GLuint i;
+    struct OptConfData userData;
+
+    initOptionCache (cache, info);
+
+    userData.cache = cache;
+    userData.screenNum = screenNum;
+    userData.driverName = driverName;
+    userData.execName = GET_PROGRAM_NAME();
+
+    if ((home = getenv ("HOME"))) {
+	GLuint len = strlen (home);
+	filenames[1] = MALLOC (len + 7+1);
+	if (filenames[1] == NULL)
+	    __driUtilMessage ("Can't allocate memory for %s/.drirc.", home);
+	else {
+	    memcpy (filenames[1], home, len);
+	    memcpy (filenames[1] + len, "/.drirc", 7+1);
+	}
+    }
+
+    for (i = 0; i < 2; ++i) {
+	XML_Parser p;
+	if (filenames[i] == NULL)
+	    continue;
+
+	p = XML_ParserCreate (NULL); /* use encoding specified by file */
+	XML_SetElementHandler (p, optConfStartElem, optConfEndElem);
+	XML_SetUserData (p, &userData);
+	userData.parser = p;
+	userData.name = filenames[i];
+	userData.ignoringDevice = 0;
+	userData.ignoringApp = 0;
+	userData.inDriConf = 0;
+	userData.inDevice = 0;
+	userData.inApp = 0;
+	userData.inOption = 0;
+
+	parseOneConfigFile (p);
+	XML_ParserFree (p);
+    }
+
+    if (filenames[1])
+	FREE (filenames[1]);
+}
+
+void driDestroyOptionInfo (driOptionCache *info) {
+    driDestroyOptionCache (info);
+    if (info->info) {
+	GLuint i, size = 1 << info->tableSize;
+	for (i = 0; i < size; ++i) {
+	    if (info->info[i].name) {
+		FREE (info->info[i].name);
+		if (info->info[i].ranges)
+		    FREE (info->info[i].ranges);
+	    }
+	}
+	FREE (info->info);
+    }
+}
+
+void driDestroyOptionCache (driOptionCache *cache) {
+    if (cache->values)
+	FREE (cache->values);
+}
+
+GLboolean driCheckOption (const driOptionCache *cache, const char *name,
+			  driOptionType type) {
+    GLuint i = findOption (cache, name);
+    return cache->info[i].name != NULL && cache->info[i].type == type;
+}
+
+GLboolean driQueryOptionb (const driOptionCache *cache, const char *name) {
+    GLuint i = findOption (cache, name);
+  /* make sure the option is defined and has the correct type */
+    assert (cache->info[i].name != NULL);
+    assert (cache->info[i].type == DRI_BOOL);
+    return cache->values[i]._bool;
+}
+
+GLint driQueryOptioni (const driOptionCache *cache, const char *name) {
+    GLuint i = findOption (cache, name);
+  /* make sure the option is defined and has the correct type */
+    assert (cache->info[i].name != NULL);
+    assert (cache->info[i].type == DRI_INT || cache->info[i].type == DRI_ENUM);
+    return cache->values[i]._int;
+}
+
+GLfloat driQueryOptionf (const driOptionCache *cache, const char *name) {
+    GLuint i = findOption (cache, name);
+  /* make sure the option is defined and has the correct type */
+    assert (cache->info[i].name != NULL);
+    assert (cache->info[i].type == DRI_FLOAT);
+    return cache->values[i]._float;
+}