includes/GlobalFunctions.php

   1 <?php
   2 # Global functions used everywhere
   3
   4 $wgNumberOfArticles = -1; # Unset
   5 $wgTotalViews = -1;
   6 $wgTotalEdits = -1;
   7
   8 require_once( "DatabaseFunctions.php" );
   9 require_once( "UpdateClasses.php" );
  10 require_once( "LogPage.php" );
  11
  12 /*
  13  * Compatibility functions
  14  */
  15
  16 # PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  17 # <4.1.x will not work, as we use a number of features introduced in 4.1.0
  18 # such as the new autoglobals.
  19
  20 if( !function_exists('iconv') ) {
  21         # iconv support is not in the default configuration and so may not be present.
  22         # Assume will only ever use utf-8 and iso-8859-1.
  23         # This will *not* work in all circumstances.
  24         function iconv( $from, $to, $string ) {
  25                 if(strcasecmp( $from, $to ) == 0) return $string;
  26                 if(strcasecmp( $from, "utf-8" ) == 0) return utf8_decode( $string );
  27                 if(strcasecmp( $to, "utf-8" ) == 0) return utf8_encode( $string );
  28                 return $string;
  29         }
  30 }
  31
  32 if( !function_exists('file_get_contents') ) {
  33         # Exists in PHP 4.3.0+
  34         function file_get_contents( $filename ) {
  35                 return implode( "", file( $filename ) );
  36         }
  37 }
  38
  39 $wgRandomSeeded = false;
  40
  41 function wfSeedRandom()
  42 {
  43         global $wgRandomSeeded;
  44
  45         if ( ! $wgRandomSeeded ) {
  46                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  47                 mt_srand( $seed );
  48                 $wgRandomSeeded = true;
  49         }
  50 }
  51
  52 # Generates a URL from a URL-encoded title and a query string
  53 # Title::getLocalURL() is preferred in most cases
  54 #
  55 function wfLocalUrl( $a, $q = "" )
  56 {
  57         global $wgServer, $wgScript, $wgArticlePath;
  58
  59         $a = str_replace( " ", "_", $a );
  60
  61         if ( "" == $a ) {
  62                 if( "" == $q ) {
  63                         $a = $wgScript;
  64                 } else {
  65                         $a = "{$wgScript}?{$q}";
  66                 }
  67         } else if ( "" == $q ) {
  68                 $a = str_replace( "$1", $a, $wgArticlePath );
  69         } else if ($wgScript != '' ) {
  70                 $a = "{$wgScript}?title={$a}&{$q}";
  71         } else { //XXX ugly hack for toplevel wikis
  72                 $a = "/{$a}&{$q}";
  73         }
  74         return $a;
  75 }
  76
  77 function wfLocalUrlE( $a, $q = "" )
  78 {
  79         return wfEscapeHTML( wfLocalUrl( $a, $q ) );
  80         # die( "Call to obsolete function wfLocalUrlE()" );
  81 }
  82
  83 function wfFullUrl( $a, $q = "" ) {
  84         wfDebugDieBacktrace( "Call to obsolete function wfFullUrl(); use Title::getFullURL" );
  85 }
  86
  87 function wfFullUrlE( $a, $q = "" ) {
  88         wfDebugDieBacktrace( "Call to obsolete function wfFullUrlE(); use Title::getFullUrlE" );
  89
  90 }
  91
  92 // orphan function wfThumbUrl( $img )
  93 //{
  94 //      global $wgUploadPath;
  95 //
  96 //      $nt = Title::newFromText( $img );
  97 //      if( !$nt ) return "";
  98 //
  99 //      $name = $nt->getDBkey();
 100 //      $hash = md5( $name );
 101 //
 102 //      $url = "{$wgUploadPath}/thumb/" . $hash{0} . "/" .
 103 //        substr( $hash, 0, 2 ) . "/{$name}";
 104 //      return wfUrlencode( $url );
 105 //}
 106
 107
 108 function wfImageArchiveUrl( $name )
 109 {
 110         global $wgUploadPath;
 111
 112         $hash = md5( substr( $name, 15) );
 113         $url = "{$wgUploadPath}/archive/" . $hash{0} . "/" .
 114           substr( $hash, 0, 2 ) . "/{$name}";
 115         return wfUrlencode($url);
 116 }
 117
 118 function wfUrlencode ( $s )
 119 {
 120         $s = urlencode( $s );
 121         $s = preg_replace( "/%3[Aa]/", ":", $s );
 122         $s = preg_replace( "/%2[Ff]/", "/", $s );
 123
 124         return $s;
 125 }
 126
 127 function wfUtf8Sequence($codepoint) {
 128         if($codepoint <     0x80) return chr($codepoint);
 129         if($codepoint <    0x800) return chr($codepoint >>  6 & 0x3f | 0xc0) .
 130                                      chr($codepoint       & 0x3f | 0x80);
 131     if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
 132                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 133                                      chr($codepoint       & 0x3f | 0x80);
 134         if($codepoint < 0x100000) return chr($codepoint >> 18 & 0x07 | 0xf0) . # Double-check this
 135                                          chr($codepoint >> 12 & 0x3f | 0x80) .
 136                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 137                                      chr($codepoint       & 0x3f | 0x80);
 138         # Doesn't yet handle outside the BMP
 139         return "&#$codepoint;";
 140 }
 141
 142 function wfMungeToUtf8($string) {
 143         global $wgInputEncoding; # This is debatable
 144         #$string = iconv($wgInputEncoding, "UTF-8", $string);
 145         $string = preg_replace ( '/&#([0-9]+);/e', 'wfUtf8Sequence($1)', $string );
 146         $string = preg_replace ( '/&#x([0-9a-f]+);/ie', 'wfUtf8Sequence(0x$1)', $string );
 147         # Should also do named entities here
 148         return $string;
 149 }
 150
 151 function wfDebug( $text, $logonly = false )
 152 {
 153         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly;
 154
 155         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 156                 $wgOut->debug( $text );
 157         }
 158         if ( "" != $wgDebugLogFile && !$wgProfileOnly ) {
 159                 error_log( $text, 3, $wgDebugLogFile );
 160         }
 161 }
 162
 163 function logProfilingData()
 164 {
 165         global $wgRequestTime, $wgDebugLogFile;
 166         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 167         $now = wfTime();
 168
 169         list( $usec, $sec ) = explode( " ", $wgRequestTime );
 170         $start = (float)$sec + (float)$usec;
 171         $elapsed = $now - $start;
 172         if ( "" != $wgDebugLogFile ) {
 173                 $prof = wfGetProfilingOutput( $start, $elapsed );
 174                 $forward = "";
 175                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 176                         $forward = " forwarded for " . $_SERVER['HTTP_X_FORWARDED_FOR'];
 177                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 178                         $forward .= " client IP " . $_SERVER['HTTP_CLIENT_IP'];
 179                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 180                         $forward .= " from " . $_SERVER['HTTP_FROM'];
 181                 if( $forward )
 182                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 183                 if($wgUser->getId() == 0)
 184                         $forward .= " anon";
 185                 $log = sprintf( "%s\t%04.3f\t%s\n",
 186                   gmdate( "YmdHis" ), $elapsed,
 187                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 188                 error_log( $log . $prof, 3, $wgDebugLogFile );
 189         }
 190 }
 191
 192
 193 function wfReadOnly()
 194 {
 195         global $wgReadOnlyFile;
 196
 197         if ( "" == $wgReadOnlyFile ) { return false; }
 198         return is_file( $wgReadOnlyFile );
 199 }
 200
 201 $wgReplacementKeys = array( "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9" );
 202
 203 # Get a message from anywhere
 204 function wfMsg( $key ) {
 205         $args = func_get_args();
 206         if ( count( $args ) ) {
 207                 array_shift( $args );
 208         }
 209         return wfMsgReal( $key, $args, true );
 210 }
 211
 212 # Get a message from the language file
 213 function wfMsgNoDB( $key ) {
 214         $args = func_get_args();
 215         if ( count( $args ) ) {
 216                 array_shift( $args );
 217         }
 218         return wfMsgReal( $key, $args, false );
 219 }
 220
 221 # Really get a message
 222 function wfMsgReal( $key, $args, $useDB ) {
 223         global $wgReplacementKeys, $wgMessageCache, $wgLang;
 224
 225         $fname = "wfMsg";
 226         wfProfileIn( $fname );
 227         if ( $wgMessageCache ) {
 228                 $message = $wgMessageCache->get( $key, $useDB );
 229         } elseif ( $wgLang ) {
 230                 $message = $wgLang->getMessage( $key );
 231         } else {
 232                 wfDebug( "No language object when getting $key\n" );
 233                 $message = "&lt;$key&gt;";
 234         }
 235
 236         # Replace arguments
 237         if( count( $args ) ) {
 238                 $message = str_replace( $wgReplacementKeys, $args, $message );
 239         }
 240         wfProfileOut( $fname );
 241         return $message;
 242 }
 243
 244 function wfCleanFormFields( $fields )
 245 {
 246         wfDebugDieBacktrace( "Call to obsolete wfCleanFormFields(). Use wgRequest instead..." );
 247 }
 248
 249 function wfMungeQuotes( $in )
 250 {
 251         $out = str_replace( "%", "%25", $in );
 252         $out = str_replace( "'", "%27", $out );
 253         $out = str_replace( "\"", "%22", $out );
 254         return $out;
 255 }
 256
 257 function wfDemungeQuotes( $in )
 258 {
 259         $out = str_replace( "%22", "\"", $in );
 260         $out = str_replace( "%27", "'", $out );
 261         $out = str_replace( "%25", "%", $out );
 262         return $out;
 263 }
 264
 265 function wfCleanQueryVar( $var )
 266 {
 267         wfDebugDieBacktrace( "Call to obsolete function wfCleanQueryVar(); use wgRequest instead" );
 268 }
 269
 270 function wfSpecialPage()
 271 {
 272         global $wgUser, $wgOut, $wgTitle, $wgLang;
 273
 274         /* FIXME: this list probably shouldn't be language-specific, per se */
 275         $validSP = $wgLang->getValidSpecialPages();
 276         $sysopSP = $wgLang->getSysopSpecialPages();
 277         $devSP = $wgLang->getDeveloperSpecialPages();
 278
 279         $wgOut->setArticleRelated( false );
 280         $wgOut->setRobotpolicy( "noindex,follow" );
 281
 282         $bits = split( "/", $wgTitle->getDBkey(), 2 );
 283         $t = $bits[0];
 284         if( empty( $bits[1] ) ) {
 285                 $par = NULL;
 286         } else {
 287                 $par = $bits[1];
 288         }
 289
 290         if ( array_key_exists( $t, $validSP ) ||
 291           ( $wgUser->isSysop() && array_key_exists( $t, $sysopSP ) ) ||
 292           ( $wgUser->isDeveloper() && array_key_exists( $t, $devSP ) ) ) {
 293                 if($par !== NULL)
 294                         $wgTitle = Title::makeTitle( Namespace::getSpecial(), $t );
 295
 296                 $wgOut->setPageTitle( wfMsg( strtolower( $wgTitle->getText() ) ) );
 297
 298                 $inc = "Special" . $t . ".php";
 299                 require_once( $inc );
 300                 $call = "wfSpecial" . $t;
 301                 $call( $par );
 302         } else if ( array_key_exists( $t, $sysopSP ) ) {
 303                 $wgOut->sysopRequired();
 304         } else if ( array_key_exists( $t, $devSP ) ) {
 305                 $wgOut->developerRequired();
 306         } else {
 307                 $wgOut->errorpage( "nosuchspecialpage", "nospecialpagetext" );
 308         }
 309 }
 310
 311 function wfSearch( $s )
 312 {
 313         $se = new SearchEngine( $s );
 314         $se->showResults();
 315 }
 316
 317 function wfGo( $s )
 318 { # pick the nearest match
 319         $se = new SearchEngine( $s );
 320         $se->goResult();
 321 }
 322
 323 # Just like exit() but makes a note of it.
 324 function wfAbruptExit(){
 325         static $called = false;
 326         if ( $called ){
 327                 exit();
 328         }
 329         $called = true;
 330
 331         if( function_exists( "debug_backtrace" ) ){ // PHP >= 4.3
 332                 $bt = debug_backtrace();
 333                 for($i = 0; $i < count($bt) ; $i++){
 334                         $file = $bt[$i]["file"];
 335                         $line = $bt[$i]["line"];
 336                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 337                 }
 338         } else {
 339                 wfDebug("WARNING: Abrupt exit\n");
 340         }
 341         exit();
 342 }
 343
 344 function wfDebugDieBacktrace( $msg = "" ) {
 345         $msg .= "\n<p>Backtrace:</p>\n<ul>\n";
 346         $backtrace = debug_backtrace();
 347         foreach( $backtrace as $call ) {
 348                 $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 349                 $file = $f[count($f)-1];
 350                 $msg .= "<li>" . $file . " line " . $call['line'] . ", in ";
 351                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . "::";
 352                 $msg .= $call['function'] . "()</li>\n";
 353         }
 354         die( $msg );
 355 }
 356
 357 function wfNumberOfArticles()
 358 {
 359         global $wgNumberOfArticles;
 360
 361         wfLoadSiteStats();
 362         return $wgNumberOfArticles;
 363 }
 364
 365 /* private */ function wfLoadSiteStats()
 366 {
 367         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
 368         if ( -1 != $wgNumberOfArticles ) return;
 369
 370         $sql = "SELECT ss_total_views, ss_total_edits, ss_good_articles " .
 371           "FROM site_stats WHERE ss_row_id=1";
 372         $res = wfQuery( $sql, DB_READ, "wfLoadSiteStats" );
 373
 374         if ( 0 == wfNumRows( $res ) ) { return; }
 375         else {
 376                 $s = wfFetchObject( $res );
 377                 $wgTotalViews = $s->ss_total_views;
 378                 $wgTotalEdits = $s->ss_total_edits;
 379                 $wgNumberOfArticles = $s->ss_good_articles;
 380         }
 381 }
 382
 383 function wfEscapeHTML( $in )
 384 {
 385         return str_replace(
 386                 array( "&", "\"", ">", "<" ),
 387                 array( "&amp;", "&quot;", "&gt;", "&lt;" ),
 388                 $in );
 389 }
 390
 391 function wfEscapeHTMLTagsOnly( $in ) {
 392         return str_replace(
 393                 array( "\"", ">", "<" ),
 394                 array( "&quot;", "&gt;", "&lt;" ),
 395                 $in );
 396 }
 397
 398 function wfUnescapeHTML( $in )
 399 {
 400         $in = str_replace( "&lt;", "<", $in );
 401         $in = str_replace( "&gt;", ">", $in );
 402         $in = str_replace( "&quot;", "\"", $in );
 403         $in = str_replace( "&amp;", "&", $in );
 404         return $in;
 405 }
 406
 407 function wfImageDir( $fname )
 408 {
 409         global $wgUploadDirectory;
 410
 411         $hash = md5( $fname );
 412         $oldumask = umask(0);
 413         $dest = $wgUploadDirectory . "/" . $hash{0};
 414         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 415         $dest .= "/" . substr( $hash, 0, 2 );
 416         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 417
 418         umask( $oldumask );
 419         return $dest;
 420 }
 421
 422 function wfImageThumbDir( $fname , $subdir="thumb")
 423 {
 424         return wfImageArchiveDir( $fname, $subdir );
 425 }
 426
 427 function wfImageArchiveDir( $fname , $subdir="archive")
 428 {
 429         global $wgUploadDirectory;
 430
 431         $hash = md5( $fname );
 432         $oldumask = umask(0);
 433
 434         # Suppress warning messages here; if the file itself can't
 435         # be written we'll worry about it then.
 436         $archive = "{$wgUploadDirectory}/{$subdir}";
 437         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 438         $archive .= "/" . $hash{0};
 439         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 440         $archive .= "/" . substr( $hash, 0, 2 );
 441         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 442
 443         umask( $oldumask );
 444         return $archive;
 445 }
 446
 447 function wfRecordUpload( $name, $oldver, $size, $desc, $copyStatus = "", $source = "" )
 448 {
 449         global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 450         global $wgUseCopyrightUpload;
 451
 452         $fname = "wfRecordUpload";
 453
 454         $sql = "SELECT img_name,img_size,img_timestamp,img_description,img_user," .
 455           "img_user_text FROM image WHERE img_name='" . wfStrencode( $name ) . "'";
 456         $res = wfQuery( $sql, DB_READ, $fname );
 457
 458         $now = wfTimestampNow();
 459         $won = wfInvertTimestamp( $now );
 460         $size = IntVal( $size );
 461
 462         if ( $wgUseCopyrightUpload )
 463           {
 464             $textdesc = "== " . wfMsg ( "filedesc" ) . " ==\n" . $desc . "\n" .
 465               "== " . wfMsg ( "filestatus" ) . " ==\n" . $copyStatus . "\n" .
 466               "== " . wfMsg ( "filesource" ) . " ==\n" . $source ;
 467           }
 468         else $textdesc = $desc ;
 469
 470         $now = wfTimestampNow();
 471         $won = wfInvertTimestamp( $now );
 472
 473         if ( 0 == wfNumRows( $res ) ) {
 474                 $sql = "INSERT INTO image (img_name,img_size,img_timestamp," .
 475                   "img_description,img_user,img_user_text) VALUES ('" .
 476                   wfStrencode( $name ) . "',$size,'{$now}','" .
 477                   wfStrencode( $desc ) . "', '" . $wgUser->getID() .
 478                   "', '" . wfStrencode( $wgUser->getName() ) . "')";
 479                 wfQuery( $sql, DB_WRITE, $fname );
 480
 481                 $sql = "SELECT cur_id,cur_text FROM cur WHERE cur_namespace=" .
 482                   Namespace::getImage() . " AND cur_title='" .
 483                   wfStrencode( $name ) . "'";
 484                 $res = wfQuery( $sql, DB_READ, $fname );
 485                 if ( 0 == wfNumRows( $res ) ) {
 486             $common =
 487                           Namespace::getImage() . ",'" .
 488                           wfStrencode( $name ) . "','" .
 489                           wfStrencode( $desc ) . "','" . $wgUser->getID() . "','" .
 490                           wfStrencode( $wgUser->getName() ) . "','" . $now .
 491                           "',1";
 492                         $sql = "INSERT INTO cur (cur_namespace,cur_title," .
 493                           "cur_comment,cur_user,cur_user_text,cur_timestamp,cur_is_new," .
 494                           "cur_text,inverse_timestamp,cur_touched) VALUES (" .
 495                           $common .
 496                           ",'" . wfStrencode( $textdesc ) . "','{$won}','{$now}')";
 497                         wfQuery( $sql, DB_WRITE, $fname );
 498                         $id = wfInsertId() or 0; # We should throw an error instead
 499
 500                         $titleObj = Title::makeTitle( NS_IMAGE, $name );
 501                         RecentChange::notifyNew( $now, $titleObj, 0, $wgUser, $desc );
 502
 503                         $u = new SearchUpdate( $id, $name, $desc );
 504                         $u->doUpdate();
 505                 }
 506         } else {
 507                 $s = wfFetchObject( $res );
 508
 509                 $sql = "INSERT INTO oldimage (oi_name,oi_archive_name,oi_size," .
 510                   "oi_timestamp,oi_description,oi_user,oi_user_text) VALUES ('" .
 511                   wfStrencode( $s->img_name ) . "','" .
 512                   wfStrencode( $oldver ) .
 513                   "',{$s->img_size},'{$s->img_timestamp}','" .
 514                   wfStrencode( $s->img_description ) . "','" .
 515                   wfStrencode( $s->img_user ) . "','" .
 516                   wfStrencode( $s->img_user_text) . "')";
 517                 wfQuery( $sql, DB_WRITE, $fname );
 518
 519                 $sql = "UPDATE image SET img_size={$size}," .
 520                   "img_timestamp='" . wfTimestampNow() . "',img_user='" .
 521                   $wgUser->getID() . "',img_user_text='" .
 522                   wfStrencode( $wgUser->getName() ) . "', img_description='" .
 523                   wfStrencode( $desc ) . "' WHERE img_name='" .
 524                   wfStrencode( $name ) . "'";
 525                 wfQuery( $sql, DB_WRITE, $fname );
 526
 527                 $sql = "UPDATE cur SET cur_touched='{$now}' WHERE cur_namespace=" .
 528                   Namespace::getImage() . " AND cur_title='" .
 529                   wfStrencode( $name ) . "'";
 530                 wfQuery( $sql, DB_WRITE, $fname );
 531         }
 532
 533         $log = new LogPage( wfMsg( "uploadlogpage" ), wfMsg( "uploadlogpagetext" ) );
 534         $da = wfMsg( "uploadedimage", "[[:" . $wgLang->getNsText(
 535           Namespace::getImage() ) . ":{$name}|{$name}]]" );
 536         $ta = wfMsg( "uploadedimage", $name );
 537         $log->addEntry( $da, $desc, $ta );
 538 }
 539
 540
 541 /* Some generic result counters, pulled out of SearchEngine */
 542
 543 function wfShowingResults( $offset, $limit )
 544 {
 545         global $wgLang;
 546         return wfMsg( "showingresults", $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 547 }
 548
 549 function wfShowingResultsNum( $offset, $limit, $num )
 550 {
 551         global $wgLang;
 552         return wfMsg( "showingresultsnum", $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 553 }
 554
 555 function wfViewPrevNext( $offset, $limit, $link, $query = "", $atend = false )
 556 {
 557         global $wgUser, $wgLang;
 558         $fmtLimit = $wgLang->formatNum( $limit );
 559         $prev = wfMsg( "prevn", $fmtLimit );
 560         $next = wfMsg( "nextn", $fmtLimit );
 561         $link = wfUrlencode( $link );
 562
 563         $sk = $wgUser->getSkin();
 564         if ( 0 != $offset ) {
 565                 $po = $offset - $limit;
 566                 if ( $po < 0 ) { $po = 0; }
 567                 $q = "limit={$limit}&offset={$po}";
 568                 if ( "" != $query ) { $q .= "&{$query}"; }
 569                 $plink = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$prev}</a>";
 570         } else { $plink = $prev; }
 571
 572         $no = $offset + $limit;
 573         $q = "limit={$limit}&offset={$no}";
 574         if ( "" != $query ) { $q .= "&{$query}"; }
 575
 576         if ( $atend ) {
 577                 $nlink = $next;
 578         } else {
 579                 $nlink = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$next}</a>";
 580         }
 581         $nums = wfNumLink( $offset, 20, $link , $query ) . " | " .
 582           wfNumLink( $offset, 50, $link, $query ) . " | " .
 583           wfNumLink( $offset, 100, $link, $query ) . " | " .
 584           wfNumLink( $offset, 250, $link, $query ) . " | " .
 585           wfNumLink( $offset, 500, $link, $query );
 586
 587         return wfMsg( "viewprevnext", $plink, $nlink, $nums );
 588 }
 589
 590 function wfNumLink( $offset, $limit, $link, $query = "" )
 591 {
 592         global $wgUser, $wgLang;
 593         if ( "" == $query ) { $q = ""; }
 594         else { $q = "{$query}&"; }
 595         $q .= "limit={$limit}&offset={$offset}";
 596
 597         $fmtLimit = $wgLang->formatNum( $limit );
 598         $s = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$fmtLimit}</a>";
 599         return $s;
 600 }
 601
 602 function wfClientAcceptsGzip() {
 603         global $wgUseGzip;
 604         if( $wgUseGzip ) {
 605                 # FIXME: we may want to blacklist some broken browsers
 606                 if( preg_match(
 607                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 608                         $_SERVER["HTTP_ACCEPT_ENCODING"],
 609                         $m ) ) {
 610                         if( ( $m[1] == "q" ) && ( $m[2] == 0 ) ) return false;
 611                         wfDebug( " accepts gzip\n" );
 612                         return true;
 613                 }
 614         }
 615         return false;
 616 }
 617
 618 # Yay, more global functions!
 619 function wfCheckLimits( $deflimit = 50, $optionname = "rclimit" ) {
 620         global $wgUser, $wgRequest;
 621
 622         $limit = $wgRequest->getInt( 'limit', 0 );
 623         if( $limit < 0 ) $limit = 0;
 624         if( ( $limit == 0 ) && ( $optionname != "" ) ) {
 625                 $limit = (int)$wgUser->getOption( $optionname );
 626         }
 627         if( $limit <= 0 ) $limit = $deflimit;
 628         if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 629
 630         $offset = $wgRequest->getInt( 'offset', 0 );
 631         if( $offset < 0 ) $offset = 0;
 632         if( $offset > 65000 ) $offset = 65000; # do we need a max? what?
 633
 634         return array( $limit, $offset );
 635 }
 636
 637 # Escapes the given text so that it may be output using addWikiText()
 638 # without any linking, formatting, etc. making its way through. This
 639 # is achieved by substituting certain characters with HTML entities.
 640 # As required by the callers, <nowiki> is not used. It currently does
 641 # not filter out characters which have special meaning only at the
 642 # start of a line, such as "*".
 643 function wfEscapeWikiText( $text )
 644 {
 645         $text = str_replace(
 646                 array( '[',     '|',      "'",     'ISBN '    , '://'     , "\n=" ),
 647                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;" ),
 648                 htmlspecialchars($text) );
 649         return $text;
 650 }
 651
 652 function wfQuotedPrintable( $string, $charset = "" )
 653 {
 654         # Probably incomplete; see RFC 2045
 655         if( empty( $charset ) ) {
 656                 global $wgInputEncoding;
 657                 $charset = $wgInputEncoding;
 658         }
 659         $charset = strtoupper( $charset );
 660         $charset = str_replace( "ISO-8859", "ISO8859", $charset ); // ?
 661
 662         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 663         $replace = $illegal . '\t ?_';
 664         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 665         $out = "=?$charset?Q?";
 666         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 667         $out .= "?=";
 668         return $out;
 669 }
 670
 671 function wfTime(){
 672         $st = explode( " ", microtime() );
 673         return (float)$st[0] + (float)$st[1];
 674 }
 675
 676 # Changes the first character to an HTML entity
 677 function wfHtmlEscapeFirst( $text ) {
 678         $ord = ord($text);
 679         $newText = substr($text, 1);
 680         return "&#$ord;$newText";
 681 }
 682
 683 # Sets dest to source and returns the original value of dest
 684 function wfSetVar( &$dest, $source )
 685 {
 686         $temp = $dest;
 687         $dest = $source;
 688         return $temp;
 689 }
 690
 691 # Sets dest to a reference to source and returns the original dest
 692 function &wfSetRef( &$dest, &$source )
 693 {
 694         $temp =& $dest;
 695         $dest =& $source;
 696         return $temp;
 697 }
 698
 699 # This function takes two arrays as input, and returns a CGI-style string, e.g.
 700 # "days=7&limit=100". Options in the first array override options in the second.
 701 # Options set to "" will not be output.
 702 function wfArrayToCGI( $array1, $array2 = NULL )
 703 {
 704         if ( !is_null( $array2 ) ) {
 705                 $array1 = $array1 + $array2;
 706         }
 707
 708         $cgi = "";
 709         foreach ( $array1 as $key => $value ) {
 710                 if ( "" !== $value ) {
 711                         if ( "" != $cgi ) {
 712                                 $cgi .= "&";
 713                         }
 714                         $cgi .= "{$key}={$value}";
 715                 }
 716         }
 717         return $cgi;
 718 }
 719
 720 # This is obsolete, use SquidUpdate::purge()
 721 function wfPurgeSquidServers ($urlArr) {
 722         SquidUpdate::purge( $urlArr );
 723 }
 724
 725 # Windows-compatible version of escapeshellarg()
 726 function wfEscapeShellArg( )
 727 {
 728         $args = func_get_args();
 729         $first = true;
 730         $retVal = "";
 731         foreach ( $args as $arg ) {
 732                 if ( !$first ) {
 733                         $retVal .= " ";
 734                 } else {
 735                         $first = false;
 736                 }
 737
 738                 if (substr(php_uname(), 0, 7) == "Windows") {
 739                         $retVal .= "\"$arg\"";
 740                 } else {
 741                         $retVal .= escapeshellarg( $arg );
 742                 }
 743         }
 744         return $retVal;
 745 }
 746
 747 # wfMerge attempts to merge differences between three texts.
 748 # Returns true for a clean merge and false for failure or a conflict.
 749
 750 function wfMerge( $old, $mine, $yours, &$result ){
 751         global $wgDiff3;
 752
 753         # This check may also protect against code injection in
 754         # case of broken installations.
 755         if(! file_exists( $wgDiff3 ) ){
 756                 return false;
 757         }
 758
 759         # Make temporary files
 760         $td = "/tmp/";
 761         $oldtextFile = fopen( $oldtextName = tempnam( $td, "merge-old-" ), "w" );
 762         $mytextFile = fopen( $mytextName = tempnam( $td, "merge-mine-" ), "w" );
 763         $yourtextFile = fopen( $yourtextName = tempnam( $td, "merge-your-" ), "w" );
 764
 765         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 766         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 767         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 768
 769         # Check for a conflict
 770     $cmd = wfEscapeShellArg( $wgDiff3 ) . " -a --overlap-only " .
 771       wfEscapeShellArg( $mytextName ) . " " .
 772       wfEscapeShellArg( $oldtextName ) . " " .
 773       wfEscapeShellArg( $yourtextName );
 774     $handle = popen( $cmd, "r" );
 775
 776         if( fgets( $handle ) ){
 777                 $conflict = true;
 778         } else {
 779                 $conflict = false;
 780         }
 781         pclose( $handle );
 782
 783         # Merge differences
 784         $cmd = wfEscapeShellArg( $wgDiff3 ) . " -a -e --merge " .
 785           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 786         $handle = popen( $cmd, "r" );
 787         $result = "";
 788         do {
 789                 $data = fread( $handle, 8192 );
 790                 if ( strlen( $data ) == 0 ) {
 791                         break;
 792                 }
 793                 $result .= $data;
 794         } while ( true );
 795         pclose( $handle );
 796         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 797         return ! $conflict;
 798 }
 799
 800 function wfVarDump( $var )
 801 {
 802         global $wgOut;
 803         $s = str_replace("\n","<br>\n", var_export( $var, true ) . "\n");
 804         if ( headers_sent() || !@is_object( $wgOut ) ) {
 805                 print $s;
 806         } else {
 807                 $wgOut->addHTML( $s );
 808         }
 809 }
 810
 811 # Provide a simple HTTP error.
 812 function wfHttpError( $code, $label, $desc ) {
 813         global $wgOut;
 814         $wgOut->disable();
 815         header( "HTTP/1.0 $code $label" );
 816         header( "Status: $code $label" );
 817         $wgOut->sendCacheControl();
 818
 819         # Don't send content if it's a HEAD request.
 820         if( $_SERVER['REQUEST_METHOD'] == 'HEAD' ) {
 821                 header( "Content-type: text/plain" );
 822                 print "$desc\n";
 823         }
 824 }
 825
 826 # Converts an Accept-* header into an array mapping string values to quality factors
 827 function wfAcceptToPrefs( $accept, $def = "*/*" ) {
 828         # No arg means accept anything (per HTTP spec)
 829         if( !$accept ) {
 830                 return array( $def => 1 );
 831         }
 832
 833         $prefs = array();
 834
 835         $parts = explode( ",", $accept );
 836
 837         foreach( $parts as $part ) {
 838                 # FIXME: doesn't deal with params like 'text/html; level=1'
 839                 @list( $value, $qpart ) = explode( ";", $part );
 840                 if( !isset( $qpart ) ) {
 841                         $prefs[$value] = 1;
 842                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 843                         $prefs[$value] = $match[1];
 844                 }
 845         }
 846
 847         return $prefs;
 848 }
 849
 850 /* private */ function mimeTypeMatch( $type, $avail ) {
 851         if( array_key_exists($type, $avail) ) {
 852                 return $type;
 853         } else {
 854                 $parts = explode( '/', $type );
 855                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 856                         return $parts[0] . '/*';
 857                 } elseif( array_key_exists( '*/*', $avail ) ) {
 858                         return '*/*';
 859                 } else {
 860                         return NULL;
 861                 }
 862         }
 863 }
 864
 865 # FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 866 # XXX: generalize to negotiate other stuff
 867 function wfNegotiateType( $cprefs, $sprefs ) {
 868         $combine = array();
 869
 870         foreach( array_keys($sprefs) as $type ) {
 871                 $parts = explode( '/', $type );
 872                 if( $parts[1] != '*' ) {
 873                         $ckey = mimeTypeMatch( $type, $cprefs );
 874                         if( $ckey ) {
 875                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 876                         }
 877                 }
 878         }
 879
 880         foreach( array_keys( $cprefs ) as $type ) {
 881                 $parts = explode( '/', $type );
 882                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 883                         $skey = mimeTypeMatch( $type, $sprefs );
 884                         if( $skey ) {
 885                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 886                         }
 887                 }
 888         }
 889
 890         $bestq = 0;
 891         $besttype = NULL;
 892
 893         foreach( array_keys( $combine ) as $type ) {
 894                 if( $combine[$type] > $bestq ) {
 895                         $besttype = $type;
 896                         $bestq = $combine[$type];
 897                 }
 898         }
 899
 900         return $besttype;
 901 }
 902
 903 ?>