dlls/msi/helpers.c

   1 /*
   2  * Implementation of the Microsoft Installer (msi.dll)
   3  *
   4  * Copyright 2005 Aric Stewart for CodeWeavers
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 /*
  22  * Here are helper functions formally in action.c that are used by a variety of
  23  * actions and functions.
  24  */
  25
  26 #include <stdarg.h>
  27
  28 #include "windef.h"
  29 #include "wine/debug.h"
  30 #include "msipriv.h"
  31 #include "winuser.h"
  32 #include "wine/unicode.h"
  33 #include "msidefs.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(msi);
  36
  37 static const WCHAR cszTargetDir[] = {'T','A','R','G','E','T','D','I','R',0};
  38 static const WCHAR cszDatabase[]={'D','A','T','A','B','A','S','E',0};
  39
  40 LPWSTR build_icon_path(MSIPACKAGE *package, LPCWSTR icon_name )
  41 {
  42     LPWSTR SystemFolder, dest, FilePath;
  43
  44     static const WCHAR szInstaller[] =
  45         {'M','i','c','r','o','s','o','f','t','\\',
  46          'I','n','s','t','a','l','l','e','r','\\',0};
  47     static const WCHAR szFolder[] =
  48         {'A','p','p','D','a','t','a','F','o','l','d','e','r',0};
  49
  50     SystemFolder = msi_dup_property( package->db, szFolder );
  51
  52     dest = build_directory_name(3, SystemFolder, szInstaller, package->ProductCode);
  53
  54     create_full_pathW(dest);
  55
  56     FilePath = build_directory_name(2, dest, icon_name);
  57
  58     msi_free(SystemFolder);
  59     msi_free(dest);
  60     return FilePath;
  61 }
  62
  63 LPWSTR msi_dup_record_field( MSIRECORD *rec, INT field )
  64 {
  65     DWORD sz = 0;
  66     LPWSTR str;
  67     UINT r;
  68
  69     if (MSI_RecordIsNull( rec, field ))
  70         return NULL;
  71
  72     r = MSI_RecordGetStringW( rec, field, NULL, &sz );
  73     if (r != ERROR_SUCCESS)
  74         return NULL;
  75
  76     sz ++;
  77     str = msi_alloc( sz * sizeof (WCHAR) );
  78     if (!str)
  79         return str;
  80     str[0] = 0;
  81     r = MSI_RecordGetStringW( rec, field, str, &sz );
  82     if (r != ERROR_SUCCESS)
  83     {
  84         ERR("failed to get string!\n");
  85         msi_free( str );
  86         return NULL;
  87     }
  88     return str;
  89 }
  90
  91 MSICOMPONENT* get_loaded_component( MSIPACKAGE* package, LPCWSTR Component )
  92 {
  93     MSICOMPONENT *comp;
  94
  95     LIST_FOR_EACH_ENTRY( comp, &package->components, MSICOMPONENT, entry )
  96     {
  97         if (lstrcmpW(Component,comp->Component)==0)
  98             return comp;
  99     }
 100     return NULL;
 101 }
 102
 103 MSIFEATURE* get_loaded_feature(MSIPACKAGE* package, LPCWSTR Feature )
 104 {
 105     MSIFEATURE *feature;
 106
 107     LIST_FOR_EACH_ENTRY( feature, &package->features, MSIFEATURE, entry )
 108     {
 109         if (lstrcmpW( Feature, feature->Feature )==0)
 110             return feature;
 111     }
 112     return NULL;
 113 }
 114
 115 MSIFILE* get_loaded_file( MSIPACKAGE* package, LPCWSTR key )
 116 {
 117     MSIFILE *file;
 118
 119     LIST_FOR_EACH_ENTRY( file, &package->files, MSIFILE, entry )
 120     {
 121         if (lstrcmpW( key, file->File )==0)
 122             return file;
 123     }
 124     return NULL;
 125 }
 126
 127 int track_tempfile( MSIPACKAGE *package, LPCWSTR path )
 128 {
 129     MSITEMPFILE *temp;
 130
 131     TRACE("%s\n", debugstr_w(path));
 132
 133     LIST_FOR_EACH_ENTRY( temp, &package->tempfiles, MSITEMPFILE, entry )
 134         if (!lstrcmpW( path, temp->Path ))
 135             return 0;
 136
 137     temp = msi_alloc_zero( sizeof (MSITEMPFILE) );
 138     if (!temp)
 139         return -1;
 140
 141     list_add_head( &package->tempfiles, &temp->entry );
 142     temp->Path = strdupW( path );
 143
 144     return 0;
 145 }
 146
 147 MSIFOLDER *get_loaded_folder( MSIPACKAGE *package, LPCWSTR dir )
 148 {
 149     MSIFOLDER *folder;
 150
 151     LIST_FOR_EACH_ENTRY( folder, &package->folders, MSIFOLDER, entry )
 152     {
 153         if (lstrcmpW( dir, folder->Directory )==0)
 154             return folder;
 155     }
 156     return NULL;
 157 }
 158
 159 static LPWSTR get_source_root( MSIPACKAGE *package )
 160 {
 161     LPWSTR path, p;
 162
 163     path = msi_dup_property( package->db, cszSourceDir );
 164     if (path)
 165         return path;
 166
 167     path = msi_dup_property( package->db, cszDatabase );
 168     if (path)
 169     {
 170         p = strrchrW(path,'\\');
 171         if (p)
 172             *(p+1) = 0;
 173     }
 174     return path;
 175 }
 176
 177 /*
 178  * clean_spaces_from_path()
 179  *
 180  * removes spaces from the beginning and end of path segments
 181  * removes multiple \\ characters
 182  */
 183 static void clean_spaces_from_path( LPWSTR p )
 184 {
 185     LPWSTR q = p;
 186     int n, len = 0;
 187
 188     while (1)
 189     {
 190         /* copy until the end of the string or a space */
 191         while (*p != ' ' && (*q = *p))
 192         {
 193             p++, len++;
 194             /* reduce many backslashes to one */
 195             if (*p != '\\' || *q != '\\')
 196                 q++;
 197         }
 198
 199         /* quit at the end of the string */
 200         if (!*p)
 201             break;
 202
 203         /* count the number of spaces */
 204         n = 0;
 205         while (p[n] == ' ')
 206             n++;
 207
 208         /* if it's leading or trailing space, skip it */
 209         if ( len == 0 || p[-1] == '\\' || p[n] == '\\' )
 210             p += n;
 211         else  /* copy n spaces */
 212             while (n && (*q++ = *p++)) n--;
 213     }
 214 }
 215
 216 LPWSTR resolve_file_source(MSIPACKAGE *package, MSIFILE *file)
 217 {
 218     LPWSTR p, path;
 219
 220     TRACE("Working to resolve source of file %s\n", debugstr_w(file->File));
 221
 222     if (file->IsCompressed)
 223         return NULL;
 224
 225     p = resolve_folder(package, file->Component->Directory,
 226                        TRUE, FALSE, TRUE, NULL);
 227     path = build_directory_name(2, p, file->ShortName);
 228
 229     if (file->LongName &&
 230         GetFileAttributesW(path) == INVALID_FILE_ATTRIBUTES)
 231     {
 232         msi_free(path);
 233         path = build_directory_name(2, p, file->LongName);
 234     }
 235
 236     msi_free(p);
 237
 238     TRACE("file %s source resolves to %s\n", debugstr_w(file->File),
 239           debugstr_w(path));
 240
 241     return path;
 242 }
 243
 244 LPWSTR resolve_folder(MSIPACKAGE *package, LPCWSTR name, BOOL source,
 245                       BOOL set_prop, BOOL load_prop, MSIFOLDER **folder)
 246 {
 247     MSIFOLDER *f;
 248     LPWSTR p, path = NULL, parent;
 249
 250     TRACE("Working to resolve %s\n",debugstr_w(name));
 251
 252     if (!name)
 253         return NULL;
 254
 255     if (!lstrcmpW(name,cszSourceDir))
 256         name = cszTargetDir;
 257
 258     f = get_loaded_folder( package, name );
 259     if (!f)
 260         return NULL;
 261
 262     /* special resolving for Target and Source root dir */
 263     if (!strcmpW(name,cszTargetDir))
 264     {
 265         if (!f->ResolvedTarget && !f->Property)
 266         {
 267             LPWSTR check_path;
 268             check_path = msi_dup_property( package->db, cszTargetDir );
 269             if (!check_path)
 270             {
 271                 check_path = msi_dup_property( package->db, cszRootDrive );
 272                 if (set_prop)
 273                     msi_set_property( package->db, cszTargetDir, check_path );
 274             }
 275
 276             /* correct misbuilt target dir */
 277             path = build_directory_name(2, check_path, NULL);
 278             clean_spaces_from_path( path );
 279             if (strcmpiW(path,check_path)!=0)
 280                 msi_set_property( package->db, cszTargetDir, path );
 281             msi_free(check_path);
 282
 283             f->ResolvedTarget = path;
 284         }
 285
 286         if (!f->ResolvedSource)
 287             f->ResolvedSource = get_source_root( package );
 288     }
 289
 290     if (folder)
 291         *folder = f;
 292
 293     if (!source && f->ResolvedTarget)
 294     {
 295         path = strdupW( f->ResolvedTarget );
 296         TRACE("   already resolved to %s\n",debugstr_w(path));
 297         return path;
 298     }
 299
 300     if (source && f->ResolvedSource)
 301     {
 302         path = strdupW( f->ResolvedSource );
 303         TRACE("   (source)already resolved to %s\n",debugstr_w(path));
 304         return path;
 305     }
 306
 307     if (!source && f->Property)
 308     {
 309         path = build_directory_name( 2, f->Property, NULL );
 310
 311         TRACE("   internally set to %s\n",debugstr_w(path));
 312         if (set_prop)
 313             msi_set_property( package->db, name, path );
 314         return path;
 315     }
 316
 317     if (!source && load_prop && (path = msi_dup_property( package->db, name )))
 318     {
 319         f->ResolvedTarget = strdupW( path );
 320         TRACE("   property set to %s\n", debugstr_w(path));
 321         return path;
 322     }
 323
 324     if (!f->Parent)
 325         return path;
 326
 327     parent = f->Parent;
 328
 329     TRACE(" ! Parent is %s\n", debugstr_w(parent));
 330
 331     p = resolve_folder(package, parent, source, set_prop, load_prop, NULL);
 332     if (!source)
 333     {
 334         TRACE("   TargetDefault = %s\n", debugstr_w(f->TargetDefault));
 335
 336         path = build_directory_name( 3, p, f->TargetDefault, NULL );
 337         clean_spaces_from_path( path );
 338         f->ResolvedTarget = strdupW( path );
 339         TRACE("target -> %s\n", debugstr_w(path));
 340         if (set_prop)
 341             msi_set_property( package->db, name, path );
 342     }
 343     else
 344     {
 345         path = NULL;
 346
 347         if (package->WordCount & msidbSumInfoSourceTypeCompressed)
 348             path = get_source_root( package );
 349         else if (package->WordCount & msidbSumInfoSourceTypeSFN)
 350             path = build_directory_name( 3, p, f->SourceShortPath, NULL );
 351         else
 352             path = build_directory_name( 3, p, f->SourceLongPath, NULL );
 353
 354         TRACE("source -> %s\n", debugstr_w(path));
 355         f->ResolvedSource = strdupW( path );
 356     }
 357     msi_free(p);
 358
 359     return path;
 360 }
 361
 362 /* wrapper to resist a need for a full rewrite right now */
 363 DWORD deformat_string(MSIPACKAGE *package, LPCWSTR ptr, WCHAR** data )
 364 {
 365     if (ptr)
 366     {
 367         MSIRECORD *rec = MSI_CreateRecord(1);
 368         DWORD size = 0;
 369
 370         MSI_RecordSetStringW(rec,0,ptr);
 371         MSI_FormatRecordW(package,rec,NULL,&size);
 372
 373         size++;
 374         *data = msi_alloc(size*sizeof(WCHAR));
 375         if (size > 1)
 376             MSI_FormatRecordW(package,rec,*data,&size);
 377         else
 378             *data[0] = 0;
 379
 380         msiobj_release( &rec->hdr );
 381         return sizeof(WCHAR)*size;
 382     }
 383
 384     *data = NULL;
 385     return 0;
 386 }
 387
 388 UINT schedule_action(MSIPACKAGE *package, UINT script, LPCWSTR action)
 389 {
 390     UINT count;
 391     LPWSTR *newbuf = NULL;
 392     if (script >= TOTAL_SCRIPTS)
 393     {
 394         FIXME("Unknown script requested %i\n",script);
 395         return ERROR_FUNCTION_FAILED;
 396     }
 397     TRACE("Scheduling Action %s in script %i\n",debugstr_w(action), script);
 398
 399     count = package->script->ActionCount[script];
 400     package->script->ActionCount[script]++;
 401     if (count != 0)
 402         newbuf = msi_realloc( package->script->Actions[script],
 403                         package->script->ActionCount[script]* sizeof(LPWSTR));
 404     else
 405         newbuf = msi_alloc( sizeof(LPWSTR));
 406
 407     newbuf[count] = strdupW(action);
 408     package->script->Actions[script] = newbuf;
 409
 410    return ERROR_SUCCESS;
 411 }
 412
 413 void msi_free_action_script(MSIPACKAGE *package, UINT script)
 414 {
 415     UINT i;
 416     for (i = 0; i < package->script->ActionCount[script]; i++)
 417         msi_free(package->script->Actions[script][i]);
 418
 419     msi_free(package->script->Actions[script]);
 420     package->script->Actions[script] = NULL;
 421     package->script->ActionCount[script] = 0;
 422 }
 423
 424 /*
 425  *  build_directory_name()
 426  *
 427  *  This function is to save messing round with directory names
 428  *  It handles adding backslashes between path segments,
 429  *   and can add \ at the end of the directory name if told to.
 430  *
 431  *  It takes a variable number of arguments.
 432  *  It always allocates a new string for the result, so make sure
 433  *   to free the return value when finished with it.
 434  *
 435  *  The first arg is the number of path segments that follow.
 436  *  The arguments following count are a list of path segments.
 437  *  A path segment may be NULL.
 438  *
 439  *  Path segments will be added with a \ separating them.
 440  *  A \ will not be added after the last segment, however if the
 441  *    last segment is NULL, then the last character will be a \
 442  *
 443  */
 444 LPWSTR build_directory_name(DWORD count, ...)
 445 {
 446     DWORD sz = 1, i;
 447     LPWSTR dir;
 448     va_list va;
 449
 450     va_start(va,count);
 451     for(i=0; i<count; i++)
 452     {
 453         LPCWSTR str = va_arg(va,LPCWSTR);
 454         if (str)
 455             sz += strlenW(str) + 1;
 456     }
 457     va_end(va);
 458
 459     dir = msi_alloc(sz*sizeof(WCHAR));
 460     dir[0]=0;
 461
 462     va_start(va,count);
 463     for(i=0; i<count; i++)
 464     {
 465         LPCWSTR str = va_arg(va,LPCWSTR);
 466         if (!str)
 467             continue;
 468         strcatW(dir, str);
 469         if( ((i+1)!=count) && dir[strlenW(dir)-1]!='\\')
 470             strcatW(dir, szBackSlash);
 471     }
 472     return dir;
 473 }
 474
 475 /***********************************************************************
 476  *            create_full_pathW
 477  *
 478  * Recursively create all directories in the path.
 479  *
 480  * shamelessly stolen from setupapi/queue.c
 481  */
 482 BOOL create_full_pathW(const WCHAR *path)
 483 {
 484     BOOL ret = TRUE;
 485     int len;
 486     WCHAR *new_path;
 487
 488     new_path = msi_alloc( (strlenW(path) + 1) * sizeof(WCHAR));
 489
 490     strcpyW(new_path, path);
 491
 492     while((len = strlenW(new_path)) && new_path[len - 1] == '\\')
 493     new_path[len - 1] = 0;
 494
 495     while(!CreateDirectoryW(new_path, NULL))
 496     {
 497         WCHAR *slash;
 498         DWORD last_error = GetLastError();
 499         if(last_error == ERROR_ALREADY_EXISTS)
 500             break;
 501
 502         if(last_error != ERROR_PATH_NOT_FOUND)
 503         {
 504             ret = FALSE;
 505             break;
 506         }
 507
 508         if(!(slash = strrchrW(new_path, '\\')))
 509         {
 510             ret = FALSE;
 511             break;
 512         }
 513
 514         len = slash - new_path;
 515         new_path[len] = 0;
 516         if(!create_full_pathW(new_path))
 517         {
 518             ret = FALSE;
 519             break;
 520         }
 521         new_path[len] = '\\';
 522     }
 523
 524     msi_free(new_path);
 525     return ret;
 526 }
 527
 528 void ui_progress(MSIPACKAGE *package, int a, int b, int c, int d )
 529 {
 530     MSIRECORD * row;
 531
 532     row = MSI_CreateRecord(4);
 533     MSI_RecordSetInteger(row,1,a);
 534     MSI_RecordSetInteger(row,2,b);
 535     MSI_RecordSetInteger(row,3,c);
 536     MSI_RecordSetInteger(row,4,d);
 537     MSI_ProcessMessage(package, INSTALLMESSAGE_PROGRESS, row);
 538     msiobj_release(&row->hdr);
 539
 540     msi_dialog_check_messages(NULL);
 541 }
 542
 543 void ui_actiondata(MSIPACKAGE *package, LPCWSTR action, MSIRECORD * record)
 544 {
 545     static const WCHAR Query_t[] =
 546         {'S','E','L','E','C','T',' ','*',' ','F','R','O','M',' ',
 547          '`','A','c','t','i','o', 'n','T','e','x','t','`',' ',
 548          'W','H','E','R','E',' ', '`','A','c','t','i','o','n','`',' ','=',
 549          ' ','\'','%','s','\'',0};
 550     WCHAR message[1024];
 551     MSIRECORD * row = 0;
 552     DWORD size;
 553
 554     if (!package->LastAction || strcmpW(package->LastAction,action))
 555     {
 556         row = MSI_QueryGetRecord(package->db, Query_t, action);
 557         if (!row)
 558             return;
 559
 560         if (MSI_RecordIsNull(row,3))
 561         {
 562             msiobj_release(&row->hdr);
 563             return;
 564         }
 565
 566         /* update the cached actionformat */
 567         msi_free(package->ActionFormat);
 568         package->ActionFormat = msi_dup_record_field(row,3);
 569
 570         msi_free(package->LastAction);
 571         package->LastAction = strdupW(action);
 572
 573         msiobj_release(&row->hdr);
 574     }
 575
 576     MSI_RecordSetStringW(record,0,package->ActionFormat);
 577     size = 1024;
 578     MSI_FormatRecordW(package,record,message,&size);
 579
 580     row = MSI_CreateRecord(1);
 581     MSI_RecordSetStringW(row,1,message);
 582
 583     MSI_ProcessMessage(package, INSTALLMESSAGE_ACTIONDATA, row);
 584
 585     msiobj_release(&row->hdr);
 586 }
 587
 588 void reduce_to_longfilename(WCHAR* filename)
 589 {
 590     LPWSTR p = strchrW(filename,'|');
 591     if (p)
 592         memmove(filename, p+1, (strlenW(p+1)+1)*sizeof(WCHAR));
 593 }
 594
 595 LPWSTR create_component_advertise_string(MSIPACKAGE* package,
 596                 MSICOMPONENT* component, LPCWSTR feature)
 597 {
 598     static const WCHAR fmt[] = {'%','s','%','s','%','c','%','s',0};
 599     WCHAR productid_85[21], component_85[21];
 600     LPWSTR output = NULL;
 601     DWORD sz = 0;
 602     GUID clsid;
 603
 604     /* > is used if there is a component GUID and < if not.  */
 605
 606     productid_85[0] = 0;
 607     component_85[0] = 0;
 608
 609     CLSIDFromString(package->ProductCode, &clsid);
 610     encode_base85_guid(&clsid, productid_85);
 611
 612     if (component)
 613     {
 614         CLSIDFromString(component->ComponentId, &clsid);
 615         encode_base85_guid(&clsid, component_85);
 616     }
 617
 618     TRACE("prod=%s feat=%s comp=%s\n", debugstr_w(productid_85),
 619           debugstr_w(feature), debugstr_w(component_85));
 620
 621     sz = 20 + lstrlenW(feature) + 20 + 3;
 622
 623     output = msi_alloc_zero(sz*sizeof(WCHAR));
 624
 625     sprintfW(output, fmt, productid_85, feature,
 626              component?'>':'<', component_85);
 627
 628     return output;
 629 }
 630
 631 /* update component state based on a feature change */
 632 void ACTION_UpdateComponentStates(MSIPACKAGE *package, LPCWSTR szFeature)
 633 {
 634     INSTALLSTATE newstate;
 635     MSIFEATURE *feature;
 636     ComponentList *cl;
 637
 638     feature = get_loaded_feature(package,szFeature);
 639     if (!feature)
 640         return;
 641
 642     newstate = feature->ActionRequest;
 643
 644     if (newstate == INSTALLSTATE_ABSENT)
 645         newstate = INSTALLSTATE_UNKNOWN;
 646
 647     LIST_FOR_EACH_ENTRY( cl, &feature->Components, ComponentList, entry )
 648     {
 649         MSICOMPONENT* component = cl->component;
 650
 651         TRACE("MODIFYING(%i): Component %s (Installed %i, Action %i, Request %i)\n",
 652             newstate, debugstr_w(component->Component), component->Installed,
 653             component->Action, component->ActionRequest);
 654
 655         if (!component->Enabled)
 656             continue;
 657
 658         if (newstate == INSTALLSTATE_LOCAL)
 659             msi_component_set_state(package, component, INSTALLSTATE_LOCAL);
 660         else
 661         {
 662             ComponentList *clist;
 663             MSIFEATURE *f;
 664
 665             component->hasLocalFeature = FALSE;
 666
 667             msi_component_set_state(package, component, newstate);
 668
 669             /*if any other feature wants is local we need to set it local*/
 670             LIST_FOR_EACH_ENTRY( f, &package->features, MSIFEATURE, entry )
 671             {
 672                 if ( f->ActionRequest != INSTALLSTATE_LOCAL &&
 673                      f->ActionRequest != INSTALLSTATE_SOURCE )
 674                 {
 675                     continue;
 676                 }
 677
 678                 LIST_FOR_EACH_ENTRY( clist, &f->Components, ComponentList, entry )
 679                 {
 680                     if ( clist->component == component &&
 681                          (f->ActionRequest == INSTALLSTATE_LOCAL ||
 682                           f->ActionRequest == INSTALLSTATE_SOURCE) )
 683                     {
 684                         TRACE("Saved by %s\n", debugstr_w(f->Feature));
 685                         component->hasLocalFeature = TRUE;
 686
 687                         if (component->Attributes & msidbComponentAttributesOptional)
 688                         {
 689                             if (f->Attributes & msidbFeatureAttributesFavorSource)
 690                                 msi_component_set_state(package, component, INSTALLSTATE_SOURCE);
 691                             else
 692                                 msi_component_set_state(package, component, INSTALLSTATE_LOCAL);
 693                         }
 694                         else if (component->Attributes & msidbComponentAttributesSourceOnly)
 695                             msi_component_set_state(package, component, INSTALLSTATE_SOURCE);
 696                         else
 697                             msi_component_set_state(package, component, INSTALLSTATE_LOCAL);
 698                     }
 699                 }
 700             }
 701         }
 702         TRACE("Result (%i): Component %s (Installed %i, Action %i, Request %i)\n",
 703             newstate, debugstr_w(component->Component), component->Installed,
 704             component->Action, component->ActionRequest);
 705     }
 706 }
 707
 708 UINT register_unique_action(MSIPACKAGE *package, LPCWSTR action)
 709 {
 710     UINT count;
 711     LPWSTR *newbuf = NULL;
 712
 713     if (!package->script)
 714         return FALSE;
 715
 716     TRACE("Registering %s as unique action\n", debugstr_w(action));
 717
 718     count = package->script->UniqueActionsCount;
 719     package->script->UniqueActionsCount++;
 720     if (count != 0)
 721         newbuf = msi_realloc( package->script->UniqueActions,
 722                         package->script->UniqueActionsCount* sizeof(LPWSTR));
 723     else
 724         newbuf = msi_alloc( sizeof(LPWSTR));
 725
 726     newbuf[count] = strdupW(action);
 727     package->script->UniqueActions = newbuf;
 728
 729     return ERROR_SUCCESS;
 730 }
 731
 732 BOOL check_unique_action(const MSIPACKAGE *package, LPCWSTR action)
 733 {
 734     UINT i;
 735
 736     if (!package->script)
 737         return FALSE;
 738
 739     for (i = 0; i < package->script->UniqueActionsCount; i++)
 740         if (!strcmpW(package->script->UniqueActions[i],action))
 741             return TRUE;
 742
 743     return FALSE;
 744 }
 745
 746 WCHAR* generate_error_string(MSIPACKAGE *package, UINT error, DWORD count, ... )
 747 {
 748     static const WCHAR query[] = {'S','E','L','E','C','T',' ','`','M','e','s','s','a','g','e','`',' ','F','R','O','M',' ','`','E','r','r','o','r','`',' ','W','H','E','R','E',' ','`','E','r','r','o','r','`',' ','=',' ','%','i',0};
 749
 750     MSIRECORD *rec;
 751     MSIRECORD *row;
 752     DWORD size = 0;
 753     DWORD i;
 754     va_list va;
 755     LPCWSTR str;
 756     LPWSTR data;
 757
 758     row = MSI_QueryGetRecord(package->db, query, error);
 759     if (!row)
 760         return 0;
 761
 762     rec = MSI_CreateRecord(count+2);
 763
 764     str = MSI_RecordGetString(row,1);
 765     MSI_RecordSetStringW(rec,0,str);
 766     msiobj_release( &row->hdr );
 767     MSI_RecordSetInteger(rec,1,error);
 768
 769     va_start(va,count);
 770     for (i = 0; i < count; i++)
 771     {
 772         str = va_arg(va,LPCWSTR);
 773         MSI_RecordSetStringW(rec,(i+2),str);
 774     }
 775     va_end(va);
 776
 777     MSI_FormatRecordW(package,rec,NULL,&size);
 778
 779     size++;
 780     data = msi_alloc(size*sizeof(WCHAR));
 781     if (size > 1)
 782         MSI_FormatRecordW(package,rec,data,&size);
 783     else
 784         data[0] = 0;
 785     msiobj_release( &rec->hdr );
 786     return data;
 787 }