dlls/kernel/module.c

   1 /*
   2  * Modules
   3  *
   4  * Copyright 1995 Alexandre Julliard
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include "ntstatus.h"
  33 #define WIN32_NO_STATUS
  34 #include "wine/winbase16.h"
  35 #include "winerror.h"
  36 #include "windef.h"
  37 #include "winbase.h"
  38 #include "winternl.h"
  39 #include "thread.h"
  40 #include "module.h"
  41 #include "kernel_private.h"
  42
  43 #include "wine/exception.h"
  44 #include "wine/debug.h"
  45 #include "wine/unicode.h"
  46 #include "wine/server.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(module);
  49
  50 static WCHAR *dll_directory;  /* extra path for SetDllDirectoryW */
  51
  52 static CRITICAL_SECTION dlldir_section;
  53 static CRITICAL_SECTION_DEBUG critsect_debug =
  54 {
  55     0, 0, &dlldir_section,
  56     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  57       0, 0, { (DWORD_PTR)(__FILE__ ": dlldir_section") }
  58 };
  59 static CRITICAL_SECTION dlldir_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  60
  61
  62 /****************************************************************************
  63  *              GetDllDirectoryA   (KERNEL32.@)
  64  */
  65 DWORD WINAPI GetDllDirectoryA( DWORD buf_len, LPSTR buffer )
  66 {
  67     DWORD len;
  68
  69     RtlEnterCriticalSection( &dlldir_section );
  70     len = dll_directory ? FILE_name_WtoA( dll_directory, strlenW(dll_directory), NULL, 0 ) : 0;
  71     if (buffer && buf_len > len)
  72     {
  73         if (dll_directory) FILE_name_WtoA( dll_directory, -1, buffer, buf_len );
  74         else *buffer = 0;
  75     }
  76     else
  77     {
  78         len++;  /* for terminating null */
  79         if (buffer) *buffer = 0;
  80     }
  81     RtlLeaveCriticalSection( &dlldir_section );
  82     return len;
  83 }
  84
  85
  86 /****************************************************************************
  87  *              GetDllDirectoryW   (KERNEL32.@)
  88  */
  89 DWORD WINAPI GetDllDirectoryW( DWORD buf_len, LPWSTR buffer )
  90 {
  91     DWORD len;
  92
  93     RtlEnterCriticalSection( &dlldir_section );
  94     len = dll_directory ? strlenW( dll_directory ) : 0;
  95     if (buffer && buf_len > len)
  96     {
  97         if (dll_directory) memcpy( buffer, dll_directory, (len + 1) * sizeof(WCHAR) );
  98         else *buffer = 0;
  99     }
 100     else
 101     {
 102         len++;  /* for terminating null */
 103         if (buffer) *buffer = 0;
 104     }
 105     RtlLeaveCriticalSection( &dlldir_section );
 106     return len;
 107 }
 108
 109
 110 /****************************************************************************
 111  *              SetDllDirectoryA   (KERNEL32.@)
 112  */
 113 BOOL WINAPI SetDllDirectoryA( LPCSTR dir )
 114 {
 115     WCHAR *dirW;
 116     BOOL ret;
 117
 118     if (!(dirW = FILE_name_AtoW( dir, TRUE ))) return FALSE;
 119     ret = SetDllDirectoryW( dirW );
 120     HeapFree( GetProcessHeap(), 0, dirW );
 121     return ret;
 122 }
 123
 124
 125 /****************************************************************************
 126  *              SetDllDirectoryW   (KERNEL32.@)
 127  */
 128 BOOL WINAPI SetDllDirectoryW( LPCWSTR dir )
 129 {
 130     WCHAR *newdir = NULL;
 131
 132     if (dir)
 133     {
 134         DWORD len = (strlenW(dir) + 1) * sizeof(WCHAR);
 135         if (!(newdir = HeapAlloc( GetProcessHeap(), 0, len )))
 136         {
 137             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 138             return FALSE;
 139         }
 140         memcpy( newdir, dir, len );
 141     }
 142
 143     RtlEnterCriticalSection( &dlldir_section );
 144     HeapFree( GetProcessHeap(), 0, dll_directory );
 145     dll_directory = newdir;
 146     RtlLeaveCriticalSection( &dlldir_section );
 147     return TRUE;
 148 }
 149
 150
 151 /****************************************************************************
 152  *              DisableThreadLibraryCalls (KERNEL32.@)
 153  *
 154  * Inform the module loader that thread notifications are not required for a dll.
 155  *
 156  * PARAMS
 157  *  hModule [I] Module handle to skip calls for
 158  *
 159  * RETURNS
 160  *  Success: TRUE. Thread attach and detach notifications will not be sent
 161  *           to hModule.
 162  *  Failure: FALSE. Use GetLastError() to determine the cause.
 163  *
 164  * NOTES
 165  *  This is typically called from the dll entry point of a dll during process
 166  *  attachment, for dlls that do not need to process thread notifications.
 167  */
 168 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
 169 {
 170     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
 171     if (nts == STATUS_SUCCESS) return TRUE;
 172
 173     SetLastError( RtlNtStatusToDosError( nts ) );
 174     return FALSE;
 175 }
 176
 177
 178 /* Check whether a file is an OS/2 or a very old Windows executable
 179  * by testing on import of KERNEL.
 180  *
 181  * FIXME: is reading the module imports the only way of discerning
 182  *        old Windows binaries from OS/2 ones ? At least it seems so...
 183  */
 184 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
 185                                                  const IMAGE_OS2_HEADER *ne)
 186 {
 187     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
 188     enum binary_type ret = BINARY_OS216;
 189     LPWORD modtab = NULL;
 190     LPSTR nametab = NULL;
 191     DWORD len;
 192     int i;
 193
 194     /* read modref table */
 195     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
 196       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
 197       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
 198       || (len != ne->ne_cmod*sizeof(WORD)) )
 199         goto broken;
 200
 201     /* read imported names table */
 202     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 203       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 204       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 205       || (len != ne->ne_enttab - ne->ne_imptab) )
 206         goto broken;
 207
 208     for (i=0; i < ne->ne_cmod; i++)
 209     {
 210         LPSTR module = &nametab[modtab[i]];
 211         TRACE("modref: %.*s\n", module[0], &module[1]);
 212         if (!(strncmp(&module[1], "KERNEL", module[0])))
 213         { /* very old Windows file */
 214             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 215             ret = BINARY_WIN16;
 216             goto good;
 217         }
 218     }
 219
 220 broken:
 221     ERR("Hmm, an error occurred. Is this binary file broken?\n");
 222
 223 good:
 224     HeapFree( GetProcessHeap(), 0, modtab);
 225     HeapFree( GetProcessHeap(), 0, nametab);
 226     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 227     return ret;
 228 }
 229
 230 /***********************************************************************
 231  *           MODULE_GetBinaryType
 232  */
 233 enum binary_type MODULE_GetBinaryType( HANDLE hfile, void **res_start, void **res_end )
 234 {
 235     union
 236     {
 237         struct
 238         {
 239             unsigned char magic[4];
 240             unsigned char ignored[12];
 241             unsigned short type;
 242         } elf;
 243         struct
 244         {
 245             unsigned long magic;
 246             unsigned long cputype;
 247             unsigned long cpusubtype;
 248             unsigned long filetype;
 249         } macho;
 250         IMAGE_DOS_HEADER mz;
 251     } header;
 252
 253     DWORD len;
 254
 255     /* Seek to the start of the file and read the header information. */
 256     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 257         return BINARY_UNKNOWN;
 258     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 259         return BINARY_UNKNOWN;
 260
 261     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 262     {
 263         /* FIXME: we don't bother to check byte order, architecture, etc. */
 264         switch(header.elf.type)
 265         {
 266         case 2: return BINARY_UNIX_EXE;
 267         case 3: return BINARY_UNIX_LIB;
 268         }
 269         return BINARY_UNKNOWN;
 270     }
 271
 272     /* Mach-o File with Endian set to Big Endian or Little Endian */
 273     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xcefaedfe)
 274     {
 275         switch(header.macho.filetype)
 276         {
 277             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 278         }
 279         return BINARY_UNKNOWN;
 280     }
 281
 282     /* Not ELF, try DOS */
 283
 284     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 285     {
 286         union
 287         {
 288             IMAGE_OS2_HEADER os2;
 289             IMAGE_NT_HEADERS nt;
 290         } ext_header;
 291
 292         /* We do have a DOS image so we will now try to seek into
 293          * the file by the amount indicated by the field
 294          * "Offset to extended header" and read in the
 295          * "magic" field information at that location.
 296          * This will tell us if there is more header information
 297          * to read or not.
 298          */
 299         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 300             return BINARY_DOS;
 301         if (!ReadFile( hfile, &ext_header, sizeof(ext_header), &len, NULL ) || len < 4)
 302             return BINARY_DOS;
 303
 304         /* Reading the magic field succeeded so
 305          * we will try to determine what type it is.
 306          */
 307         if (!memcmp( &ext_header.nt.Signature, "PE\0\0", 4 ))
 308         {
 309             if (len >= sizeof(ext_header.nt.FileHeader))
 310             {
 311                 if (len < sizeof(ext_header.nt))  /* clear remaining part of header if missing */
 312                     memset( (char *)&ext_header.nt + len, 0, sizeof(ext_header.nt) - len );
 313                 if (res_start) *res_start = (void *)ext_header.nt.OptionalHeader.ImageBase;
 314                 if (res_end) *res_end = (void *)(ext_header.nt.OptionalHeader.ImageBase +
 315                                                  ext_header.nt.OptionalHeader.SizeOfImage);
 316                 if (ext_header.nt.FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 317                 return BINARY_PE_EXE;
 318             }
 319             return BINARY_DOS;
 320         }
 321
 322         if (!memcmp( &ext_header.os2.ne_magic, "NE", 2 ))
 323         {
 324             /* This is a Windows executable (NE) header.  This can
 325              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 326              * DOS program (running under a DOS extender).  To decide
 327              * which, we'll have to read the NE header.
 328              */
 329             if (len >= sizeof(ext_header.os2))
 330             {
 331                 switch ( ext_header.os2.ne_exetyp )
 332                 {
 333                 case 1:  return BINARY_OS216; /* OS/2 */
 334                 case 2:  return BINARY_WIN16; /* Windows */
 335                 case 3:  return BINARY_DOS; /* European MS-DOS 4.x */
 336                 case 4:  return BINARY_WIN16; /* Windows 386; FIXME: is this 32bit??? */
 337                 case 5:  return BINARY_DOS; /* BOSS, Borland Operating System Services */
 338                 /* other types, e.g. 0 is: "unknown" */
 339                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ext_header.os2);
 340                 }
 341             }
 342             /* Couldn't read header, so abort. */
 343             return BINARY_DOS;
 344         }
 345
 346         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 347         return BINARY_DOS;
 348     }
 349
 350     return BINARY_UNKNOWN;
 351 }
 352
 353 /***********************************************************************
 354  *             GetBinaryTypeW                     [KERNEL32.@]
 355  *
 356  * Determine whether a file is executable, and if so, what kind.
 357  *
 358  * PARAMS
 359  *  lpApplicationName [I] Path of the file to check
 360  *  lpBinaryType      [O] Destination for the binary type
 361  *
 362  * RETURNS
 363  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 364  *  FALSE, if the file is not an executable or if the function fails.
 365  *
 366  * NOTES
 367  *  The type of executable is a property that determines which subsytem an
 368  *  executable file runs under. lpBinaryType can be set to one of the following
 369  *  values:
 370  *   SCS_32BIT_BINARY: A Win32 based application
 371  *   SCS_DOS_BINARY: An MS-Dos based application
 372  *   SCS_WOW_BINARY: A Win16 based application
 373  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 374  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 375  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 376  *
 377  *  To find the binary type, this function reads in the files header information.
 378  *  If extended header information is not present it will assume that the file
 379  *  is a DOS executable. If extended header information is present it will
 380  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 381  *  flags in the header.
 382  *
 383  *  ".com" and ".pif" files are only recognized by their file name extension,
 384  *  as per native Windows.
 385  */
 386 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 387 {
 388     BOOL ret = FALSE;
 389     HANDLE hfile;
 390
 391     TRACE("%s\n", debugstr_w(lpApplicationName) );
 392
 393     /* Sanity check.
 394      */
 395     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 396         return FALSE;
 397
 398     /* Open the file indicated by lpApplicationName for reading.
 399      */
 400     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 401                          NULL, OPEN_EXISTING, 0, 0 );
 402     if ( hfile == INVALID_HANDLE_VALUE )
 403         return FALSE;
 404
 405     /* Check binary type
 406      */
 407     switch(MODULE_GetBinaryType( hfile, NULL, NULL ))
 408     {
 409     case BINARY_UNKNOWN:
 410     {
 411         static const WCHAR comW[] = { '.','C','O','M',0 };
 412         static const WCHAR pifW[] = { '.','P','I','F',0 };
 413         const WCHAR *ptr;
 414
 415         /* try to determine from file name */
 416         ptr = strrchrW( lpApplicationName, '.' );
 417         if (!ptr) break;
 418         if (!strcmpiW( ptr, comW ))
 419         {
 420             *lpBinaryType = SCS_DOS_BINARY;
 421             ret = TRUE;
 422         }
 423         else if (!strcmpiW( ptr, pifW ))
 424         {
 425             *lpBinaryType = SCS_PIF_BINARY;
 426             ret = TRUE;
 427         }
 428         break;
 429     }
 430     case BINARY_PE_EXE:
 431     case BINARY_PE_DLL:
 432         *lpBinaryType = SCS_32BIT_BINARY;
 433         ret = TRUE;
 434         break;
 435     case BINARY_WIN16:
 436         *lpBinaryType = SCS_WOW_BINARY;
 437         ret = TRUE;
 438         break;
 439     case BINARY_OS216:
 440         *lpBinaryType = SCS_OS216_BINARY;
 441         ret = TRUE;
 442         break;
 443     case BINARY_DOS:
 444         *lpBinaryType = SCS_DOS_BINARY;
 445         ret = TRUE;
 446         break;
 447     case BINARY_UNIX_EXE:
 448     case BINARY_UNIX_LIB:
 449         ret = FALSE;
 450         break;
 451     }
 452
 453     CloseHandle( hfile );
 454     return ret;
 455 }
 456
 457 /***********************************************************************
 458  *             GetBinaryTypeA                     [KERNEL32.@]
 459  *             GetBinaryType                      [KERNEL32.@]
 460  *
 461  * See GetBinaryTypeW.
 462  */
 463 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 464 {
 465     ANSI_STRING app_nameA;
 466     NTSTATUS status;
 467
 468     TRACE("%s\n", debugstr_a(lpApplicationName));
 469
 470     /* Sanity check.
 471      */
 472     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 473         return FALSE;
 474
 475     RtlInitAnsiString(&app_nameA, lpApplicationName);
 476     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 477                                           &app_nameA, FALSE);
 478     if (!status)
 479         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 480
 481     SetLastError(RtlNtStatusToDosError(status));
 482     return FALSE;
 483 }
 484
 485
 486 /***********************************************************************
 487  *              GetModuleHandleA         (KERNEL32.@)
 488  *              GetModuleHandle32        (KERNEL.488)
 489  *
 490  * Get the handle of a dll loaded into the process address space.
 491  *
 492  * PARAMS
 493  *  module [I] Name of the dll
 494  *
 495  * RETURNS
 496  *  Success: A handle to the loaded dll.
 497  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 498  */
 499 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 500 {
 501     WCHAR *moduleW;
 502
 503     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 504     if (!(moduleW = FILE_name_AtoW( module, FALSE ))) return 0;
 505     return GetModuleHandleW( moduleW );
 506 }
 507
 508 /***********************************************************************
 509  *              GetModuleHandleW (KERNEL32.@)
 510  *
 511  * Unicode version of GetModuleHandleA.
 512  */
 513 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 514 {
 515     NTSTATUS            nts;
 516     HMODULE             ret;
 517     UNICODE_STRING      wstr;
 518
 519     if (!module) return NtCurrentTeb()->Peb->ImageBaseAddress;
 520
 521     RtlInitUnicodeString( &wstr, module );
 522     nts = LdrGetDllHandle( 0, 0, &wstr, &ret);
 523     if (nts != STATUS_SUCCESS)
 524     {
 525         SetLastError( RtlNtStatusToDosError( nts ) );
 526         ret = 0;
 527     }
 528     return ret;
 529 }
 530
 531
 532 /***********************************************************************
 533  *              GetModuleFileNameA      (KERNEL32.@)
 534  *              GetModuleFileName32     (KERNEL.487)
 535  *
 536  * Get the file name of a loaded module from its handle.
 537  *
 538  * RETURNS
 539  *  Success: The length of the file name, excluding the terminating NUL.
 540  *  Failure: 0. Use GetLastError() to determine the cause.
 541  *
 542  * NOTES
 543  *  This function always returns the long path of hModule (as opposed to
 544  *  GetModuleFileName16() which returns short paths when the modules version
 545  *  field is < 4.0).
 546  *  The function doesn't write a terminating '\0' if the buffer is too
 547  *  small.
 548  */
 549 DWORD WINAPI GetModuleFileNameA(
 550         HMODULE hModule,        /* [in] Module handle (32 bit) */
 551         LPSTR lpFileName,       /* [out] Destination for file name */
 552         DWORD size )            /* [in] Size of lpFileName in characters */
 553 {
 554     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 555     DWORD len;
 556
 557     if (!filenameW)
 558     {
 559         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 560         return 0;
 561     }
 562     if ((len = GetModuleFileNameW( hModule, filenameW, size )))
 563     {
 564         len = FILE_name_WtoA( filenameW, len, lpFileName, size );
 565         if (len < size) lpFileName[len] = '\0';
 566     }
 567     HeapFree( GetProcessHeap(), 0, filenameW );
 568     return len;
 569 }
 570
 571 /***********************************************************************
 572  *              GetModuleFileNameW      (KERNEL32.@)
 573  *
 574  * Unicode version of GetModuleFileNameA.
 575  */
 576 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 577 {
 578     ULONG magic, len = 0;
 579     LDR_MODULE *pldr;
 580     NTSTATUS nts;
 581     WIN16_SUBSYSTEM_TIB *win16_tib;
 582
 583     if (!hModule && ((win16_tib = NtCurrentTeb()->Tib.SubSystemTib)) && win16_tib->exe_name)
 584     {
 585         len = min(size, win16_tib->exe_name->Length / sizeof(WCHAR));
 586         memcpy( lpFileName, win16_tib->exe_name->Buffer, len * sizeof(WCHAR) );
 587         if (len < size) lpFileName[len] = '\0';
 588         goto done;
 589     }
 590
 591     LdrLockLoaderLock( 0, NULL, &magic );
 592
 593     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 594     nts = LdrFindEntryForAddress( hModule, &pldr );
 595     if (nts == STATUS_SUCCESS)
 596     {
 597         len = min(size, pldr->FullDllName.Length / sizeof(WCHAR));
 598         memcpy(lpFileName, pldr->FullDllName.Buffer, len * sizeof(WCHAR));
 599         if (len < size) lpFileName[len] = '\0';
 600     }
 601     else SetLastError( RtlNtStatusToDosError( nts ) );
 602
 603     LdrUnlockLoaderLock( 0, magic );
 604 done:
 605     TRACE( "%s\n", debugstr_wn(lpFileName, len) );
 606     return len;
 607 }
 608
 609
 610 /***********************************************************************
 611  *           get_dll_system_path
 612  */
 613 static const WCHAR *get_dll_system_path(void)
 614 {
 615     static WCHAR *cached_path;
 616
 617     if (!cached_path)
 618     {
 619         WCHAR *p, *path;
 620         int len = 3;
 621
 622         len += 2 * GetSystemDirectoryW( NULL, 0 );
 623         len += GetWindowsDirectoryW( NULL, 0 );
 624         p = path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 625         *p++ = '.';
 626         *p++ = ';';
 627         GetSystemDirectoryW( p, path + len - p);
 628         p += strlenW(p);
 629         /* if system directory ends in "32" add 16-bit version too */
 630         if (p[-2] == '3' && p[-1] == '2')
 631         {
 632             *p++ = ';';
 633             GetSystemDirectoryW( p, path + len - p);
 634             p += strlenW(p) - 2;
 635         }
 636         *p++ = ';';
 637         GetWindowsDirectoryW( p, path + len - p);
 638         cached_path = path;
 639     }
 640     return cached_path;
 641 }
 642
 643
 644 /******************************************************************
 645  *              MODULE_get_dll_load_path
 646  *
 647  * Compute the load path to use for a given dll.
 648  * Returned pointer must be freed by caller.
 649  */
 650 WCHAR *MODULE_get_dll_load_path( LPCWSTR module )
 651 {
 652     static const WCHAR pathW[] = {'P','A','T','H',0};
 653
 654     const WCHAR *system_path = get_dll_system_path();
 655     const WCHAR *mod_end = NULL;
 656     UNICODE_STRING name, value;
 657     WCHAR *p, *ret;
 658     int len = 0, path_len = 0;
 659
 660     /* adjust length for module name */
 661
 662     if (!module) module = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 663     if (module)
 664     {
 665         mod_end = module;
 666         if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 667         if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 668         if (mod_end == module + 2 && module[1] == ':') mod_end++;
 669         if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 670         len += (mod_end - module) + 1;
 671     }
 672     len += strlenW( system_path ) + 2;
 673
 674     /* get the PATH variable */
 675
 676     RtlInitUnicodeString( &name, pathW );
 677     value.Length = 0;
 678     value.MaximumLength = 0;
 679     value.Buffer = NULL;
 680     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 681         path_len = value.Length;
 682
 683     RtlEnterCriticalSection( &dlldir_section );
 684     if (dll_directory) len += strlenW(dll_directory) + 1;
 685     if ((p = ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) )))
 686     {
 687         if (module)
 688         {
 689             memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 690             p += (mod_end - module);
 691             *p++ = ';';
 692         }
 693         if (dll_directory)
 694         {
 695             strcpyW( p, dll_directory );
 696             p += strlenW(p);
 697             *p++ = ';';
 698         }
 699     }
 700     RtlLeaveCriticalSection( &dlldir_section );
 701     if (!ret) return NULL;
 702
 703     strcpyW( p, system_path );
 704     p += strlenW(p);
 705     *p++ = ';';
 706     value.Buffer = p;
 707     value.MaximumLength = path_len;
 708
 709     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 710     {
 711         WCHAR *new_ptr;
 712
 713         /* grow the buffer and retry */
 714         path_len = value.Length;
 715         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 716         {
 717             HeapFree( GetProcessHeap(), 0, ret );
 718             return NULL;
 719         }
 720         value.Buffer = new_ptr + (value.Buffer - ret);
 721         value.MaximumLength = path_len;
 722         ret = new_ptr;
 723     }
 724     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 725     return ret;
 726 }
 727
 728
 729 /******************************************************************
 730  *              load_library_as_datafile
 731  */
 732 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 733 {
 734     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 735
 736     WCHAR filenameW[MAX_PATH];
 737     HANDLE hFile = INVALID_HANDLE_VALUE;
 738     HANDLE mapping;
 739     HMODULE module;
 740
 741     *hmod = 0;
 742
 743     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 744                      filenameW, NULL ))
 745     {
 746         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 747                              NULL, OPEN_EXISTING, 0, 0 );
 748     }
 749     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 750
 751     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 752     CloseHandle( hFile );
 753     if (!mapping) return FALSE;
 754
 755     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 756     CloseHandle( mapping );
 757     if (!module) return FALSE;
 758
 759     /* make sure it's a valid PE file */
 760     if (!RtlImageNtHeader(module))
 761     {
 762         UnmapViewOfFile( module );
 763         return FALSE;
 764     }
 765     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 766     return TRUE;
 767 }
 768
 769
 770 /******************************************************************
 771  *              load_library
 772  *
 773  * Helper for LoadLibraryExA/W.
 774  */
 775 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 776 {
 777     NTSTATUS nts;
 778     HMODULE hModule;
 779     WCHAR *load_path;
 780
 781     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 782     {
 783         /* The method in load_library_as_datafile allows searching for the
 784          * 'native' libraries only
 785          */
 786         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 787         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 788         /* Fallback to normal behaviour */
 789     }
 790
 791     load_path = MODULE_get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 792     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 793     HeapFree( GetProcessHeap(), 0, load_path );
 794     if (nts != STATUS_SUCCESS)
 795     {
 796         hModule = 0;
 797         SetLastError( RtlNtStatusToDosError( nts ) );
 798     }
 799     return hModule;
 800 }
 801
 802
 803 /******************************************************************
 804  *              LoadLibraryExA          (KERNEL32.@)
 805  *
 806  * Load a dll file into the process address space.
 807  *
 808  * PARAMS
 809  *  libname [I] Name of the file to load
 810  *  hfile   [I] Reserved, must be 0.
 811  *  flags   [I] Flags for loading the dll
 812  *
 813  * RETURNS
 814  *  Success: A handle to the loaded dll.
 815  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 816  *
 817  * NOTES
 818  * The HFILE parameter is not used and marked reserved in the SDK. I can
 819  * only guess that it should force a file to be mapped, but I rather
 820  * ignore the parameter because it would be extremely difficult to
 821  * integrate this with different types of module representations.
 822  */
 823 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 824 {
 825     WCHAR *libnameW;
 826
 827     if (!(libnameW = FILE_name_AtoW( libname, FALSE ))) return 0;
 828     return LoadLibraryExW( libnameW, hfile, flags );
 829 }
 830
 831 /***********************************************************************
 832  *           LoadLibraryExW       (KERNEL32.@)
 833  *
 834  * Unicode version of LoadLibraryExA.
 835  */
 836 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 837 {
 838     UNICODE_STRING      wstr;
 839     HMODULE             res;
 840
 841     if (!libnameW)
 842     {
 843         SetLastError(ERROR_INVALID_PARAMETER);
 844         return 0;
 845     }
 846     RtlInitUnicodeString( &wstr, libnameW );
 847     if (wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] != ' ')
 848         return load_library( &wstr, flags );
 849
 850     /* Library name has trailing spaces */
 851     RtlCreateUnicodeString( &wstr, libnameW );
 852     while (wstr.Length > sizeof(WCHAR) &&
 853            wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] == ' ')
 854     {
 855         wstr.Length -= sizeof(WCHAR);
 856     }
 857     wstr.Buffer[wstr.Length/sizeof(WCHAR)] = '\0';
 858     res = load_library( &wstr, flags );
 859     RtlFreeUnicodeString( &wstr );
 860     return res;
 861 }
 862
 863 /***********************************************************************
 864  *           LoadLibraryA         (KERNEL32.@)
 865  *
 866  * Load a dll file into the process address space.
 867  *
 868  * PARAMS
 869  *  libname [I] Name of the file to load
 870  *
 871  * RETURNS
 872  *  Success: A handle to the loaded dll.
 873  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 874  *
 875  * NOTES
 876  * See LoadLibraryExA().
 877  */
 878 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 879 {
 880     return LoadLibraryExA(libname, 0, 0);
 881 }
 882
 883 /***********************************************************************
 884  *           LoadLibraryW         (KERNEL32.@)
 885  *
 886  * Unicode version of LoadLibraryA.
 887  */
 888 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 889 {
 890     return LoadLibraryExW(libnameW, 0, 0);
 891 }
 892
 893 /***********************************************************************
 894  *           FreeLibrary   (KERNEL32.@)
 895  *           FreeLibrary32 (KERNEL.486)
 896  *
 897  * Free a dll loaded into the process address space.
 898  *
 899  * PARAMS
 900  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 901  *
 902  * RETURNS
 903  *  Success: TRUE. The dll is removed if it is not still in use.
 904  *  Failure: FALSE. Use GetLastError() to determine the cause.
 905  */
 906 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 907 {
 908     BOOL                retv = FALSE;
 909     NTSTATUS            nts;
 910
 911     if (!hLibModule)
 912     {
 913         SetLastError( ERROR_INVALID_HANDLE );
 914         return FALSE;
 915     }
 916
 917     if ((ULONG_PTR)hLibModule & 1)
 918     {
 919         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 920         char *ptr = (char *)hLibModule - 1;
 921         UnmapViewOfFile( ptr );
 922         return TRUE;
 923     }
 924
 925     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 926     else SetLastError( RtlNtStatusToDosError( nts ) );
 927
 928     return retv;
 929 }
 930
 931 /***********************************************************************
 932  *           GetProcAddress             (KERNEL32.@)
 933  *
 934  * Find the address of an exported symbol in a loaded dll.
 935  *
 936  * PARAMS
 937  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 938  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 939  *
 940  * RETURNS
 941  *  Success: A pointer to the symbol in the process address space.
 942  *  Failure: NULL. Use GetLastError() to determine the cause.
 943  */
 944 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
 945 {
 946     NTSTATUS    nts;
 947     FARPROC     fp;
 948
 949     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 950
 951     if (HIWORD(function))
 952     {
 953         ANSI_STRING     str;
 954
 955         RtlInitAnsiString( &str, function );
 956         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
 957     }
 958     else
 959         nts = LdrGetProcedureAddress( hModule, NULL, LOWORD(function), (void**)&fp );
 960     if (nts != STATUS_SUCCESS)
 961     {
 962         SetLastError( RtlNtStatusToDosError( nts ) );
 963         fp = NULL;
 964     }
 965     return fp;
 966 }
 967
 968 /***********************************************************************
 969  *           GetProcAddress32                   (KERNEL.453)
 970  *
 971  * Find the address of an exported symbol in a loaded dll.
 972  *
 973  * PARAMS
 974  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 975  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 976  *
 977  * RETURNS
 978  *  Success: A pointer to the symbol in the process address space.
 979  *  Failure: NULL. Use GetLastError() to determine the cause.
 980  */
 981 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
 982 {
 983     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
 984     return GetProcAddress( hModule, function );
 985 }
 986
 987
 988 /***********************************************************************
 989  *           DelayLoadFailureHook  (KERNEL32.@)
 990  */
 991 FARPROC WINAPI DelayLoadFailureHook( LPCSTR name, LPCSTR function )
 992 {
 993     ULONG_PTR args[2];
 994
 995     if ((ULONG_PTR)function >> 16)
 996         ERR( "failed to delay load %s.%s\n", name, function );
 997     else
 998         ERR( "failed to delay load %s.%u\n", name, LOWORD(function) );
 999     args[0] = (ULONG_PTR)name;
1000     args[1] = (ULONG_PTR)function;
1001     RaiseException( EXCEPTION_WINE_STUB, EH_NONCONTINUABLE, 2, args );
1002     return NULL;
1003 }