dlls/kernel32/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "kernel_private.h"
  41
  42 #include "wine/exception.h"
  43 #include "wine/debug.h"
  44 #include "wine/unicode.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(module);
  47
  48 static WCHAR *dll_directory;  /* extra path for SetDllDirectoryW */
  49
  50 static CRITICAL_SECTION dlldir_section;
  51 static CRITICAL_SECTION_DEBUG critsect_debug =
  52 {
  53     0, 0, &dlldir_section,
  54     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  55       0, 0, { (DWORD_PTR)(__FILE__ ": dlldir_section") }
  56 };
  57 static CRITICAL_SECTION dlldir_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  58
  59
  60 /****************************************************************************
  61  *              GetDllDirectoryA   (KERNEL32.@)
  62  */
  63 DWORD WINAPI GetDllDirectoryA( DWORD buf_len, LPSTR buffer )
  64 {
  65     DWORD len;
  66
  67     RtlEnterCriticalSection( &dlldir_section );
  68     len = dll_directory ? FILE_name_WtoA( dll_directory, strlenW(dll_directory), NULL, 0 ) : 0;
  69     if (buffer && buf_len > len)
  70     {
  71         if (dll_directory) FILE_name_WtoA( dll_directory, -1, buffer, buf_len );
  72         else *buffer = 0;
  73     }
  74     else
  75     {
  76         len++;  /* for terminating null */
  77         if (buffer) *buffer = 0;
  78     }
  79     RtlLeaveCriticalSection( &dlldir_section );
  80     return len;
  81 }
  82
  83
  84 /****************************************************************************
  85  *              GetDllDirectoryW   (KERNEL32.@)
  86  */
  87 DWORD WINAPI GetDllDirectoryW( DWORD buf_len, LPWSTR buffer )
  88 {
  89     DWORD len;
  90
  91     RtlEnterCriticalSection( &dlldir_section );
  92     len = dll_directory ? strlenW( dll_directory ) : 0;
  93     if (buffer && buf_len > len)
  94     {
  95         if (dll_directory) memcpy( buffer, dll_directory, (len + 1) * sizeof(WCHAR) );
  96         else *buffer = 0;
  97     }
  98     else
  99     {
 100         len++;  /* for terminating null */
 101         if (buffer) *buffer = 0;
 102     }
 103     RtlLeaveCriticalSection( &dlldir_section );
 104     return len;
 105 }
 106
 107
 108 /****************************************************************************
 109  *              SetDllDirectoryA   (KERNEL32.@)
 110  */
 111 BOOL WINAPI SetDllDirectoryA( LPCSTR dir )
 112 {
 113     WCHAR *dirW;
 114     BOOL ret;
 115
 116     if (!(dirW = FILE_name_AtoW( dir, TRUE ))) return FALSE;
 117     ret = SetDllDirectoryW( dirW );
 118     HeapFree( GetProcessHeap(), 0, dirW );
 119     return ret;
 120 }
 121
 122
 123 /****************************************************************************
 124  *              SetDllDirectoryW   (KERNEL32.@)
 125  */
 126 BOOL WINAPI SetDllDirectoryW( LPCWSTR dir )
 127 {
 128     WCHAR *newdir = NULL;
 129
 130     if (dir)
 131     {
 132         DWORD len = (strlenW(dir) + 1) * sizeof(WCHAR);
 133         if (!(newdir = HeapAlloc( GetProcessHeap(), 0, len )))
 134         {
 135             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 136             return FALSE;
 137         }
 138         memcpy( newdir, dir, len );
 139     }
 140
 141     RtlEnterCriticalSection( &dlldir_section );
 142     HeapFree( GetProcessHeap(), 0, dll_directory );
 143     dll_directory = newdir;
 144     RtlLeaveCriticalSection( &dlldir_section );
 145     return TRUE;
 146 }
 147
 148
 149 /****************************************************************************
 150  *              DisableThreadLibraryCalls (KERNEL32.@)
 151  *
 152  * Inform the module loader that thread notifications are not required for a dll.
 153  *
 154  * PARAMS
 155  *  hModule [I] Module handle to skip calls for
 156  *
 157  * RETURNS
 158  *  Success: TRUE. Thread attach and detach notifications will not be sent
 159  *           to hModule.
 160  *  Failure: FALSE. Use GetLastError() to determine the cause.
 161  *
 162  * NOTES
 163  *  This is typically called from the dll entry point of a dll during process
 164  *  attachment, for dlls that do not need to process thread notifications.
 165  */
 166 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
 167 {
 168     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
 169     if (nts == STATUS_SUCCESS) return TRUE;
 170
 171     SetLastError( RtlNtStatusToDosError( nts ) );
 172     return FALSE;
 173 }
 174
 175
 176 /* Check whether a file is an OS/2 or a very old Windows executable
 177  * by testing on import of KERNEL.
 178  *
 179  * FIXME: is reading the module imports the only way of discerning
 180  *        old Windows binaries from OS/2 ones ? At least it seems so...
 181  */
 182 static enum binary_type MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz,
 183                                                  const IMAGE_OS2_HEADER *ne)
 184 {
 185     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
 186     enum binary_type ret = BINARY_OS216;
 187     LPWORD modtab = NULL;
 188     LPSTR nametab = NULL;
 189     DWORD len;
 190     int i;
 191
 192     /* read modref table */
 193     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
 194       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
 195       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
 196       || (len != ne->ne_cmod*sizeof(WORD)) )
 197         goto broken;
 198
 199     /* read imported names table */
 200     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 201       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 202       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 203       || (len != ne->ne_enttab - ne->ne_imptab) )
 204         goto broken;
 205
 206     for (i=0; i < ne->ne_cmod; i++)
 207     {
 208         LPSTR module = &nametab[modtab[i]];
 209         TRACE("modref: %.*s\n", module[0], &module[1]);
 210         if (!(strncmp(&module[1], "KERNEL", module[0])))
 211         { /* very old Windows file */
 212             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 213             ret = BINARY_WIN16;
 214             goto good;
 215         }
 216     }
 217
 218 broken:
 219     ERR("Hmm, an error occurred. Is this binary file broken?\n");
 220
 221 good:
 222     HeapFree( GetProcessHeap(), 0, modtab);
 223     HeapFree( GetProcessHeap(), 0, nametab);
 224     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 225     return ret;
 226 }
 227
 228 /***********************************************************************
 229  *           MODULE_GetBinaryType
 230  */
 231 enum binary_type MODULE_GetBinaryType( HANDLE hfile, void **res_start, void **res_end )
 232 {
 233     union
 234     {
 235         struct
 236         {
 237             unsigned char magic[4];
 238             unsigned char ignored[12];
 239             unsigned short type;
 240         } elf;
 241         struct
 242         {
 243             unsigned long magic;
 244             unsigned long cputype;
 245             unsigned long cpusubtype;
 246             unsigned long filetype;
 247         } macho;
 248         IMAGE_DOS_HEADER mz;
 249     } header;
 250
 251     DWORD len;
 252
 253     /* Seek to the start of the file and read the header information. */
 254     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1)
 255         return BINARY_UNKNOWN;
 256     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header))
 257         return BINARY_UNKNOWN;
 258
 259     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 260     {
 261         /* FIXME: we don't bother to check byte order, architecture, etc. */
 262         switch(header.elf.type)
 263         {
 264         case 2: return BINARY_UNIX_EXE;
 265         case 3: return BINARY_UNIX_LIB;
 266         }
 267         return BINARY_UNKNOWN;
 268     }
 269
 270     /* Mach-o File with Endian set to Big Endian or Little Endian */
 271     if (header.macho.magic == 0xfeedface || header.macho.magic == 0xcefaedfe)
 272     {
 273         switch(header.macho.filetype)
 274         {
 275             case 0x8: /* MH_BUNDLE */ return BINARY_UNIX_LIB;
 276         }
 277         return BINARY_UNKNOWN;
 278     }
 279
 280     /* Not ELF, try DOS */
 281
 282     if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 283     {
 284         union
 285         {
 286             IMAGE_OS2_HEADER os2;
 287             IMAGE_NT_HEADERS nt;
 288         } ext_header;
 289
 290         /* We do have a DOS image so we will now try to seek into
 291          * the file by the amount indicated by the field
 292          * "Offset to extended header" and read in the
 293          * "magic" field information at that location.
 294          * This will tell us if there is more header information
 295          * to read or not.
 296          */
 297         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1)
 298             return BINARY_DOS;
 299         if (!ReadFile( hfile, &ext_header, sizeof(ext_header), &len, NULL ) || len < 4)
 300             return BINARY_DOS;
 301
 302         /* Reading the magic field succeeded so
 303          * we will try to determine what type it is.
 304          */
 305         if (!memcmp( &ext_header.nt.Signature, "PE\0\0", 4 ))
 306         {
 307             if (len >= sizeof(ext_header.nt.FileHeader))
 308             {
 309                 if (len < sizeof(ext_header.nt))  /* clear remaining part of header if missing */
 310                     memset( (char *)&ext_header.nt + len, 0, sizeof(ext_header.nt) - len );
 311                 if (res_start) *res_start = (void *)ext_header.nt.OptionalHeader.ImageBase;
 312                 if (res_end) *res_end = (void *)(ext_header.nt.OptionalHeader.ImageBase +
 313                                                  ext_header.nt.OptionalHeader.SizeOfImage);
 314                 if (ext_header.nt.FileHeader.Characteristics & IMAGE_FILE_DLL) return BINARY_PE_DLL;
 315                 return BINARY_PE_EXE;
 316             }
 317             return BINARY_DOS;
 318         }
 319
 320         if (!memcmp( &ext_header.os2.ne_magic, "NE", 2 ))
 321         {
 322             /* This is a Windows executable (NE) header.  This can
 323              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 324              * DOS program (running under a DOS extender).  To decide
 325              * which, we'll have to read the NE header.
 326              */
 327             if (len >= sizeof(ext_header.os2))
 328             {
 329                 switch ( ext_header.os2.ne_exetyp )
 330                 {
 331                 case 1:  return BINARY_OS216; /* OS/2 */
 332                 case 2:  return BINARY_WIN16; /* Windows */
 333                 case 3:  return BINARY_DOS; /* European MS-DOS 4.x */
 334                 case 4:  return BINARY_WIN16; /* Windows 386; FIXME: is this 32bit??? */
 335                 case 5:  return BINARY_DOS; /* BOSS, Borland Operating System Services */
 336                 /* other types, e.g. 0 is: "unknown" */
 337                 default: return MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ext_header.os2);
 338                 }
 339             }
 340             /* Couldn't read header, so abort. */
 341             return BINARY_DOS;
 342         }
 343
 344         /* Unknown extended header, but this file is nonetheless DOS-executable. */
 345         return BINARY_DOS;
 346     }
 347
 348     return BINARY_UNKNOWN;
 349 }
 350
 351 /***********************************************************************
 352  *             GetBinaryTypeW                     [KERNEL32.@]
 353  *
 354  * Determine whether a file is executable, and if so, what kind.
 355  *
 356  * PARAMS
 357  *  lpApplicationName [I] Path of the file to check
 358  *  lpBinaryType      [O] Destination for the binary type
 359  *
 360  * RETURNS
 361  *  TRUE, if the file is an executable, in which case lpBinaryType is set.
 362  *  FALSE, if the file is not an executable or if the function fails.
 363  *
 364  * NOTES
 365  *  The type of executable is a property that determines which subsytem an
 366  *  executable file runs under. lpBinaryType can be set to one of the following
 367  *  values:
 368  *   SCS_32BIT_BINARY: A Win32 based application
 369  *   SCS_DOS_BINARY: An MS-Dos based application
 370  *   SCS_WOW_BINARY: A Win16 based application
 371  *   SCS_PIF_BINARY: A PIF file that executes an MS-Dos based app
 372  *   SCS_POSIX_BINARY: A POSIX based application ( Not implemented )
 373  *   SCS_OS216_BINARY: A 16bit OS/2 based application
 374  *
 375  *  To find the binary type, this function reads in the files header information.
 376  *  If extended header information is not present it will assume that the file
 377  *  is a DOS executable. If extended header information is present it will
 378  *  determine if the file is a 16 or 32 bit Windows executable by checking the
 379  *  flags in the header.
 380  *
 381  *  ".com" and ".pif" files are only recognized by their file name extension,
 382  *  as per native Windows.
 383  */
 384 BOOL WINAPI GetBinaryTypeW( LPCWSTR lpApplicationName, LPDWORD lpBinaryType )
 385 {
 386     BOOL ret = FALSE;
 387     HANDLE hfile;
 388
 389     TRACE("%s\n", debugstr_w(lpApplicationName) );
 390
 391     /* Sanity check.
 392      */
 393     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 394         return FALSE;
 395
 396     /* Open the file indicated by lpApplicationName for reading.
 397      */
 398     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 399                          NULL, OPEN_EXISTING, 0, 0 );
 400     if ( hfile == INVALID_HANDLE_VALUE )
 401         return FALSE;
 402
 403     /* Check binary type
 404      */
 405     switch(MODULE_GetBinaryType( hfile, NULL, NULL ))
 406     {
 407     case BINARY_UNKNOWN:
 408     {
 409         static const WCHAR comW[] = { '.','C','O','M',0 };
 410         static const WCHAR pifW[] = { '.','P','I','F',0 };
 411         const WCHAR *ptr;
 412
 413         /* try to determine from file name */
 414         ptr = strrchrW( lpApplicationName, '.' );
 415         if (!ptr) break;
 416         if (!strcmpiW( ptr, comW ))
 417         {
 418             *lpBinaryType = SCS_DOS_BINARY;
 419             ret = TRUE;
 420         }
 421         else if (!strcmpiW( ptr, pifW ))
 422         {
 423             *lpBinaryType = SCS_PIF_BINARY;
 424             ret = TRUE;
 425         }
 426         break;
 427     }
 428     case BINARY_PE_EXE:
 429     case BINARY_PE_DLL:
 430         *lpBinaryType = SCS_32BIT_BINARY;
 431         ret = TRUE;
 432         break;
 433     case BINARY_WIN16:
 434         *lpBinaryType = SCS_WOW_BINARY;
 435         ret = TRUE;
 436         break;
 437     case BINARY_OS216:
 438         *lpBinaryType = SCS_OS216_BINARY;
 439         ret = TRUE;
 440         break;
 441     case BINARY_DOS:
 442         *lpBinaryType = SCS_DOS_BINARY;
 443         ret = TRUE;
 444         break;
 445     case BINARY_UNIX_EXE:
 446     case BINARY_UNIX_LIB:
 447         ret = FALSE;
 448         break;
 449     }
 450
 451     CloseHandle( hfile );
 452     return ret;
 453 }
 454
 455 /***********************************************************************
 456  *             GetBinaryTypeA                     [KERNEL32.@]
 457  *             GetBinaryType                      [KERNEL32.@]
 458  *
 459  * See GetBinaryTypeW.
 460  */
 461 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 462 {
 463     ANSI_STRING app_nameA;
 464     NTSTATUS status;
 465
 466     TRACE("%s\n", debugstr_a(lpApplicationName));
 467
 468     /* Sanity check.
 469      */
 470     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 471         return FALSE;
 472
 473     RtlInitAnsiString(&app_nameA, lpApplicationName);
 474     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 475                                           &app_nameA, FALSE);
 476     if (!status)
 477         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 478
 479     SetLastError(RtlNtStatusToDosError(status));
 480     return FALSE;
 481 }
 482
 483 /***********************************************************************
 484  *              GetModuleHandleExA         (KERNEL32.@)
 485  */
 486 BOOL WINAPI GetModuleHandleExA( DWORD flags, LPCSTR name, HMODULE *module )
 487 {
 488     WCHAR *nameW;
 489
 490     if (!name || (flags & GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS))
 491         return GetModuleHandleExW( flags, (LPCWSTR)name, module );
 492
 493     if (!(nameW = FILE_name_AtoW( name, FALSE ))) return FALSE;
 494     return GetModuleHandleExW( flags, nameW, module );
 495 }
 496
 497 /***********************************************************************
 498  *              GetModuleHandleExW         (KERNEL32.@)
 499  */
 500 BOOL WINAPI GetModuleHandleExW( DWORD flags, LPCWSTR name, HMODULE *module )
 501 {
 502     NTSTATUS status = STATUS_SUCCESS;
 503     HMODULE ret;
 504
 505     if (!name)
 506     {
 507         ret = NtCurrentTeb()->Peb->ImageBaseAddress;
 508     }
 509     else if (flags & GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS)
 510     {
 511         void *dummy;
 512         if (!(ret = RtlPcToFileHeader( (void *)name, &dummy ))) status = STATUS_DLL_NOT_FOUND;
 513     }
 514     else
 515     {
 516         UNICODE_STRING wstr;
 517         RtlInitUnicodeString( &wstr, name );
 518         status = LdrGetDllHandle( 0, 0, &wstr, &ret );
 519     }
 520
 521     if (status != STATUS_SUCCESS)
 522     {
 523         SetLastError( RtlNtStatusToDosError( status ) );
 524         return FALSE;
 525     }
 526
 527     if ((flags & GET_MODULE_HANDLE_EX_FLAG_PIN) ||
 528         !(flags & GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT))
 529         FIXME( "should update refcount, flags %x\n", flags );
 530
 531     if (module) *module = ret;
 532     return TRUE;
 533 }
 534
 535 /***********************************************************************
 536  *              GetModuleHandleA         (KERNEL32.@)
 537  *              GetModuleHandle32        (KERNEL.488)
 538  *
 539  * Get the handle of a dll loaded into the process address space.
 540  *
 541  * PARAMS
 542  *  module [I] Name of the dll
 543  *
 544  * RETURNS
 545  *  Success: A handle to the loaded dll.
 546  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 547  */
 548 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 549 {
 550     HMODULE ret;
 551
 552     if (!GetModuleHandleExA( GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, module, &ret )) ret = 0;
 553     return ret;
 554 }
 555
 556 /***********************************************************************
 557  *              GetModuleHandleW (KERNEL32.@)
 558  *
 559  * Unicode version of GetModuleHandleA.
 560  */
 561 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 562 {
 563     HMODULE ret;
 564
 565     if (!GetModuleHandleExW( GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, module, &ret )) ret = 0;
 566     return ret;
 567 }
 568
 569
 570 /***********************************************************************
 571  *              GetModuleFileNameA      (KERNEL32.@)
 572  *              GetModuleFileName32     (KERNEL.487)
 573  *
 574  * Get the file name of a loaded module from its handle.
 575  *
 576  * RETURNS
 577  *  Success: The length of the file name, excluding the terminating NUL.
 578  *  Failure: 0. Use GetLastError() to determine the cause.
 579  *
 580  * NOTES
 581  *  This function always returns the long path of hModule (as opposed to
 582  *  GetModuleFileName16() which returns short paths when the modules version
 583  *  field is < 4.0).
 584  *  The function doesn't write a terminating '\0' if the buffer is too
 585  *  small.
 586  */
 587 DWORD WINAPI GetModuleFileNameA(
 588         HMODULE hModule,        /* [in] Module handle (32 bit) */
 589         LPSTR lpFileName,       /* [out] Destination for file name */
 590         DWORD size )            /* [in] Size of lpFileName in characters */
 591 {
 592     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 593     DWORD len;
 594
 595     if (!filenameW)
 596     {
 597         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 598         return 0;
 599     }
 600     if ((len = GetModuleFileNameW( hModule, filenameW, size )))
 601     {
 602         len = FILE_name_WtoA( filenameW, len, lpFileName, size );
 603         if (len < size) lpFileName[len] = '\0';
 604     }
 605     HeapFree( GetProcessHeap(), 0, filenameW );
 606     return len;
 607 }
 608
 609 /***********************************************************************
 610  *              GetModuleFileNameW      (KERNEL32.@)
 611  *
 612  * Unicode version of GetModuleFileNameA.
 613  */
 614 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 615 {
 616     ULONG magic, len = 0;
 617     LDR_MODULE *pldr;
 618     NTSTATUS nts;
 619     WIN16_SUBSYSTEM_TIB *win16_tib;
 620
 621     if (!hModule && ((win16_tib = NtCurrentTeb()->Tib.SubSystemTib)) && win16_tib->exe_name)
 622     {
 623         len = min(size, win16_tib->exe_name->Length / sizeof(WCHAR));
 624         memcpy( lpFileName, win16_tib->exe_name->Buffer, len * sizeof(WCHAR) );
 625         if (len < size) lpFileName[len] = '\0';
 626         goto done;
 627     }
 628
 629     LdrLockLoaderLock( 0, NULL, &magic );
 630
 631     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 632     nts = LdrFindEntryForAddress( hModule, &pldr );
 633     if (nts == STATUS_SUCCESS)
 634     {
 635         len = min(size, pldr->FullDllName.Length / sizeof(WCHAR));
 636         memcpy(lpFileName, pldr->FullDllName.Buffer, len * sizeof(WCHAR));
 637         if (len < size) lpFileName[len] = '\0';
 638     }
 639     else SetLastError( RtlNtStatusToDosError( nts ) );
 640
 641     LdrUnlockLoaderLock( 0, magic );
 642 done:
 643     TRACE( "%s\n", debugstr_wn(lpFileName, len) );
 644     return len;
 645 }
 646
 647
 648 /***********************************************************************
 649  *           get_dll_system_path
 650  */
 651 static const WCHAR *get_dll_system_path(void)
 652 {
 653     static WCHAR *cached_path;
 654
 655     if (!cached_path)
 656     {
 657         WCHAR *p, *path;
 658         int len = 3;
 659
 660         len += 2 * GetSystemDirectoryW( NULL, 0 );
 661         len += GetWindowsDirectoryW( NULL, 0 );
 662         p = path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 663         *p++ = '.';
 664         *p++ = ';';
 665         GetSystemDirectoryW( p, path + len - p);
 666         p += strlenW(p);
 667         /* if system directory ends in "32" add 16-bit version too */
 668         if (p[-2] == '3' && p[-1] == '2')
 669         {
 670             *p++ = ';';
 671             GetSystemDirectoryW( p, path + len - p);
 672             p += strlenW(p) - 2;
 673         }
 674         *p++ = ';';
 675         GetWindowsDirectoryW( p, path + len - p);
 676         cached_path = path;
 677     }
 678     return cached_path;
 679 }
 680
 681 /******************************************************************
 682  *              get_module_path_end
 683  *
 684  * Returns the end of the directory component of the module path.
 685  */
 686 static inline const WCHAR *get_module_path_end(const WCHAR *module)
 687 {
 688     const WCHAR *p;
 689     const WCHAR *mod_end = module;
 690     if (!module) return mod_end;
 691
 692     if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 693     if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 694     if (mod_end == module + 2 && module[1] == ':') mod_end++;
 695     if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 696
 697     return mod_end;
 698 }
 699
 700 /******************************************************************
 701  *              MODULE_get_dll_load_path
 702  *
 703  * Compute the load path to use for a given dll.
 704  * Returned pointer must be freed by caller.
 705  */
 706 WCHAR *MODULE_get_dll_load_path( LPCWSTR module )
 707 {
 708     static const WCHAR pathW[] = {'P','A','T','H',0};
 709
 710     const WCHAR *system_path = get_dll_system_path();
 711     const WCHAR *mod_end = NULL;
 712     UNICODE_STRING name, value;
 713     WCHAR *p, *ret;
 714     int len = 0, path_len = 0;
 715
 716     /* adjust length for module name */
 717
 718     if (module)
 719         mod_end = get_module_path_end( module );
 720     /* if module is NULL or doesn't contain a path, fall back to directory
 721      * process was loaded from */
 722     if (module == mod_end)
 723     {
 724         module = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 725         mod_end = get_module_path_end( module );
 726     }
 727     len += (mod_end - module) + 1;
 728
 729     len += strlenW( system_path ) + 2;
 730
 731     /* get the PATH variable */
 732
 733     RtlInitUnicodeString( &name, pathW );
 734     value.Length = 0;
 735     value.MaximumLength = 0;
 736     value.Buffer = NULL;
 737     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 738         path_len = value.Length;
 739
 740     RtlEnterCriticalSection( &dlldir_section );
 741     if (dll_directory) len += strlenW(dll_directory) + 1;
 742     if ((p = ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) )))
 743     {
 744         if (module)
 745         {
 746             memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 747             p += (mod_end - module);
 748             *p++ = ';';
 749         }
 750         if (dll_directory)
 751         {
 752             strcpyW( p, dll_directory );
 753             p += strlenW(p);
 754             *p++ = ';';
 755         }
 756     }
 757     RtlLeaveCriticalSection( &dlldir_section );
 758     if (!ret) return NULL;
 759
 760     strcpyW( p, system_path );
 761     p += strlenW(p);
 762     *p++ = ';';
 763     value.Buffer = p;
 764     value.MaximumLength = path_len;
 765
 766     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 767     {
 768         WCHAR *new_ptr;
 769
 770         /* grow the buffer and retry */
 771         path_len = value.Length;
 772         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 773         {
 774             HeapFree( GetProcessHeap(), 0, ret );
 775             return NULL;
 776         }
 777         value.Buffer = new_ptr + (value.Buffer - ret);
 778         value.MaximumLength = path_len;
 779         ret = new_ptr;
 780     }
 781     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 782     return ret;
 783 }
 784
 785
 786 /******************************************************************
 787  *              load_library_as_datafile
 788  */
 789 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 790 {
 791     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 792
 793     WCHAR filenameW[MAX_PATH];
 794     HANDLE hFile = INVALID_HANDLE_VALUE;
 795     HANDLE mapping;
 796     HMODULE module;
 797
 798     *hmod = 0;
 799
 800     if (SearchPathW( NULL, (LPCWSTR)name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 801                      filenameW, NULL ))
 802     {
 803         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 804                              NULL, OPEN_EXISTING, 0, 0 );
 805     }
 806     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 807
 808     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 809     CloseHandle( hFile );
 810     if (!mapping) return FALSE;
 811
 812     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 813     CloseHandle( mapping );
 814     if (!module) return FALSE;
 815
 816     /* make sure it's a valid PE file */
 817     if (!RtlImageNtHeader(module))
 818     {
 819         UnmapViewOfFile( module );
 820         return FALSE;
 821     }
 822     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 823     return TRUE;
 824 }
 825
 826
 827 /******************************************************************
 828  *              load_library
 829  *
 830  * Helper for LoadLibraryExA/W.
 831  */
 832 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 833 {
 834     NTSTATUS nts;
 835     HMODULE hModule;
 836     WCHAR *load_path;
 837
 838     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 839     {
 840         /* The method in load_library_as_datafile allows searching for the
 841          * 'native' libraries only
 842          */
 843         if (load_library_as_datafile( libname->Buffer, &hModule )) return hModule;
 844         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 845         /* Fallback to normal behaviour */
 846     }
 847
 848     load_path = MODULE_get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 849     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 850     HeapFree( GetProcessHeap(), 0, load_path );
 851     if (nts != STATUS_SUCCESS)
 852     {
 853         hModule = 0;
 854         SetLastError( RtlNtStatusToDosError( nts ) );
 855     }
 856     return hModule;
 857 }
 858
 859
 860 /******************************************************************
 861  *              LoadLibraryExA          (KERNEL32.@)
 862  *
 863  * Load a dll file into the process address space.
 864  *
 865  * PARAMS
 866  *  libname [I] Name of the file to load
 867  *  hfile   [I] Reserved, must be 0.
 868  *  flags   [I] Flags for loading the dll
 869  *
 870  * RETURNS
 871  *  Success: A handle to the loaded dll.
 872  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 873  *
 874  * NOTES
 875  * The HFILE parameter is not used and marked reserved in the SDK. I can
 876  * only guess that it should force a file to be mapped, but I rather
 877  * ignore the parameter because it would be extremely difficult to
 878  * integrate this with different types of module representations.
 879  */
 880 HMODULE WINAPI LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 881 {
 882     WCHAR *libnameW;
 883
 884     if (!(libnameW = FILE_name_AtoW( libname, FALSE ))) return 0;
 885     return LoadLibraryExW( libnameW, hfile, flags );
 886 }
 887
 888 /***********************************************************************
 889  *           LoadLibraryExW       (KERNEL32.@)
 890  *
 891  * Unicode version of LoadLibraryExA.
 892  */
 893 HMODULE WINAPI LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 894 {
 895     UNICODE_STRING      wstr;
 896     HMODULE             res;
 897
 898     if (!libnameW)
 899     {
 900         SetLastError(ERROR_INVALID_PARAMETER);
 901         return 0;
 902     }
 903     RtlInitUnicodeString( &wstr, libnameW );
 904     if (wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] != ' ')
 905         return load_library( &wstr, flags );
 906
 907     /* Library name has trailing spaces */
 908     RtlCreateUnicodeString( &wstr, libnameW );
 909     while (wstr.Length > sizeof(WCHAR) &&
 910            wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] == ' ')
 911     {
 912         wstr.Length -= sizeof(WCHAR);
 913     }
 914     wstr.Buffer[wstr.Length/sizeof(WCHAR)] = '\0';
 915     res = load_library( &wstr, flags );
 916     RtlFreeUnicodeString( &wstr );
 917     return res;
 918 }
 919
 920 /***********************************************************************
 921  *           LoadLibraryA         (KERNEL32.@)
 922  *
 923  * Load a dll file into the process address space.
 924  *
 925  * PARAMS
 926  *  libname [I] Name of the file to load
 927  *
 928  * RETURNS
 929  *  Success: A handle to the loaded dll.
 930  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 931  *
 932  * NOTES
 933  * See LoadLibraryExA().
 934  */
 935 HMODULE WINAPI LoadLibraryA(LPCSTR libname)
 936 {
 937     return LoadLibraryExA(libname, 0, 0);
 938 }
 939
 940 /***********************************************************************
 941  *           LoadLibraryW         (KERNEL32.@)
 942  *
 943  * Unicode version of LoadLibraryA.
 944  */
 945 HMODULE WINAPI LoadLibraryW(LPCWSTR libnameW)
 946 {
 947     return LoadLibraryExW(libnameW, 0, 0);
 948 }
 949
 950 /***********************************************************************
 951  *           FreeLibrary   (KERNEL32.@)
 952  *           FreeLibrary32 (KERNEL.486)
 953  *
 954  * Free a dll loaded into the process address space.
 955  *
 956  * PARAMS
 957  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 958  *
 959  * RETURNS
 960  *  Success: TRUE. The dll is removed if it is not still in use.
 961  *  Failure: FALSE. Use GetLastError() to determine the cause.
 962  */
 963 BOOL WINAPI FreeLibrary(HINSTANCE hLibModule)
 964 {
 965     BOOL                retv = FALSE;
 966     NTSTATUS            nts;
 967
 968     if (!hLibModule)
 969     {
 970         SetLastError( ERROR_INVALID_HANDLE );
 971         return FALSE;
 972     }
 973
 974     if ((ULONG_PTR)hLibModule & 1)
 975     {
 976         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
 977         char *ptr = (char *)hLibModule - 1;
 978         UnmapViewOfFile( ptr );
 979         return TRUE;
 980     }
 981
 982     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
 983     else SetLastError( RtlNtStatusToDosError( nts ) );
 984
 985     return retv;
 986 }
 987
 988 /***********************************************************************
 989  *           GetProcAddress             (KERNEL32.@)
 990  *
 991  * Find the address of an exported symbol in a loaded dll.
 992  *
 993  * PARAMS
 994  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
 995  *  function [I] Name of the symbol, or an integer ordinal number < 16384
 996  *
 997  * RETURNS
 998  *  Success: A pointer to the symbol in the process address space.
 999  *  Failure: NULL. Use GetLastError() to determine the cause.
1000  */
1001 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
1002 {
1003     NTSTATUS    nts;
1004     FARPROC     fp;
1005
1006     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
1007
1008     if (HIWORD(function))
1009     {
1010         ANSI_STRING     str;
1011
1012         RtlInitAnsiString( &str, function );
1013         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
1014     }
1015     else
1016         nts = LdrGetProcedureAddress( hModule, NULL, LOWORD(function), (void**)&fp );
1017     if (nts != STATUS_SUCCESS)
1018     {
1019         SetLastError( RtlNtStatusToDosError( nts ) );
1020         fp = NULL;
1021     }
1022     return fp;
1023 }
1024
1025 /***********************************************************************
1026  *           GetProcAddress32                   (KERNEL.453)
1027  *
1028  * Find the address of an exported symbol in a loaded dll.
1029  *
1030  * PARAMS
1031  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
1032  *  function [I] Name of the symbol, or an integer ordinal number < 16384
1033  *
1034  * RETURNS
1035  *  Success: A pointer to the symbol in the process address space.
1036  *  Failure: NULL. Use GetLastError() to determine the cause.
1037  */
1038 FARPROC WINAPI GetProcAddress32_16( HMODULE hModule, LPCSTR function )
1039 {
1040     /* FIXME: we used to disable snoop when returning proc for Win16 subsystem */
1041     return GetProcAddress( hModule, function );
1042 }
1043
1044
1045 /***********************************************************************
1046  *           DelayLoadFailureHook  (KERNEL32.@)
1047  */
1048 FARPROC WINAPI DelayLoadFailureHook( LPCSTR name, LPCSTR function )
1049 {
1050     ULONG_PTR args[2];
1051
1052     if ((ULONG_PTR)function >> 16)
1053         ERR( "failed to delay load %s.%s\n", name, function );
1054     else
1055         ERR( "failed to delay load %s.%u\n", name, LOWORD(function) );
1056     args[0] = (ULONG_PTR)name;
1057     args[1] = (ULONG_PTR)function;
1058     RaiseException( EXCEPTION_WINE_STUB, EH_NONCONTINUABLE, 2, args );
1059     return NULL;
1060 }