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 "kernel_private.h"
  40
  41 #include "wine/exception.h"
  42 #include "wine/debug.h"
  43 #include "wine/unicode.h"
  44
  45 WINE_DEFAULT_DEBUG_CHANNEL(module);
  46
  47 static WCHAR *dll_directory;  /* extra path for SetDllDirectoryW */
  48
  49 static CRITICAL_SECTION dlldir_section;
  50 static CRITICAL_SECTION_DEBUG critsect_debug =
  51 {
  52     0, 0, &dlldir_section,
  53     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  54       0, 0, { (DWORD_PTR)(__FILE__ ": dlldir_section") }
  55 };
  56 static CRITICAL_SECTION dlldir_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  57
  58
  59 /****************************************************************************
  60  *              GetDllDirectoryA   (KERNEL32.@)
  61  */
  62 DWORD WINAPI GetDllDirectoryA( DWORD buf_len, LPSTR buffer )
  63 {
  64     DWORD len;
  65
  66     RtlEnterCriticalSection( &dlldir_section );
  67     len = dll_directory ? FILE_name_WtoA( dll_directory, strlenW(dll_directory), NULL, 0 ) : 0;
  68     if (buffer && buf_len > len)
  69     {
  70         if (dll_directory) FILE_name_WtoA( dll_directory, -1, buffer, buf_len );
  71         else *buffer = 0;
  72     }
  73     else
  74     {
  75         len++;  /* for terminating null */
  76         if (buffer) *buffer = 0;
  77     }
  78     RtlLeaveCriticalSection( &dlldir_section );
  79     return len;
  80 }
  81
  82
  83 /****************************************************************************
  84  *              GetDllDirectoryW   (KERNEL32.@)
  85  */
  86 DWORD WINAPI GetDllDirectoryW( DWORD buf_len, LPWSTR buffer )
  87 {
  88     DWORD len;
  89
  90     RtlEnterCriticalSection( &dlldir_section );
  91     len = dll_directory ? strlenW( dll_directory ) : 0;
  92     if (buffer && buf_len > len)
  93     {
  94         if (dll_directory) memcpy( buffer, dll_directory, (len + 1) * sizeof(WCHAR) );
  95         else *buffer = 0;
  96     }
  97     else
  98     {
  99         len++;  /* for terminating null */
 100         if (buffer) *buffer = 0;
 101     }
 102     RtlLeaveCriticalSection( &dlldir_section );
 103     return len;
 104 }
 105
 106
 107 /****************************************************************************
 108  *              SetDllDirectoryA   (KERNEL32.@)
 109  */
 110 BOOL WINAPI SetDllDirectoryA( LPCSTR dir )
 111 {
 112     WCHAR *dirW;
 113     BOOL ret;
 114
 115     if (!(dirW = FILE_name_AtoW( dir, TRUE ))) return FALSE;
 116     ret = SetDllDirectoryW( dirW );
 117     HeapFree( GetProcessHeap(), 0, dirW );
 118     return ret;
 119 }
 120
 121
 122 /****************************************************************************
 123  *              SetDllDirectoryW   (KERNEL32.@)
 124  */
 125 BOOL WINAPI SetDllDirectoryW( LPCWSTR dir )
 126 {
 127     WCHAR *newdir = NULL;
 128
 129     if (dir)
 130     {
 131         DWORD len = (strlenW(dir) + 1) * sizeof(WCHAR);
 132         if (!(newdir = HeapAlloc( GetProcessHeap(), 0, len )))
 133         {
 134             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 135             return FALSE;
 136         }
 137         memcpy( newdir, dir, len );
 138     }
 139
 140     RtlEnterCriticalSection( &dlldir_section );
 141     HeapFree( GetProcessHeap(), 0, dll_directory );
 142     dll_directory = newdir;
 143     RtlLeaveCriticalSection( &dlldir_section );
 144     return TRUE;
 145 }
 146
 147
 148 /****************************************************************************
 149  *              DisableThreadLibraryCalls (KERNEL32.@)
 150  *
 151  * Inform the module loader that thread notifications are not required for a dll.
 152  *
 153  * PARAMS
 154  *  hModule [I] Module handle to skip calls for
 155  *
 156  * RETURNS
 157  *  Success: TRUE. Thread attach and detach notifications will not be sent
 158  *           to hModule.
 159  *  Failure: FALSE. Use GetLastError() to determine the cause.
 160  *
 161  * NOTES
 162  *  This is typically called from the dll entry point of a dll during process
 163  *  attachment, for dlls that do not need to process thread notifications.
 164  */
 165 BOOL WINAPI DisableThreadLibraryCalls( HMODULE hModule )
 166 {
 167     NTSTATUS    nts = LdrDisableThreadCalloutsForDll( hModule );
 168     if (nts == STATUS_SUCCESS) return TRUE;
 169
 170     SetLastError( RtlNtStatusToDosError( nts ) );
 171     return FALSE;
 172 }
 173
 174
 175 /* Check whether a file is an OS/2 or a very old Windows executable
 176  * by testing on import of KERNEL.
 177  *
 178  * FIXME: is reading the module imports the only way of discerning
 179  *        old Windows binaries from OS/2 ones ? At least it seems so...
 180  */
 181 static DWORD MODULE_Decide_OS2_OldWin(HANDLE hfile, const IMAGE_DOS_HEADER *mz, const IMAGE_OS2_HEADER *ne)
 182 {
 183     DWORD currpos = SetFilePointer( hfile, 0, NULL, SEEK_CUR);
 184     DWORD ret = BINARY_OS216;
 185     LPWORD modtab = NULL;
 186     LPSTR nametab = NULL;
 187     DWORD len;
 188     int i;
 189
 190     /* read modref table */
 191     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_modtab, NULL, SEEK_SET ) == -1)
 192       || (!(modtab = HeapAlloc( GetProcessHeap(), 0, ne->ne_cmod*sizeof(WORD))))
 193       || (!(ReadFile(hfile, modtab, ne->ne_cmod*sizeof(WORD), &len, NULL)))
 194       || (len != ne->ne_cmod*sizeof(WORD)) )
 195         goto broken;
 196
 197     /* read imported names table */
 198     if ( (SetFilePointer( hfile, mz->e_lfanew + ne->ne_imptab, NULL, SEEK_SET ) == -1)
 199       || (!(nametab = HeapAlloc( GetProcessHeap(), 0, ne->ne_enttab - ne->ne_imptab)))
 200       || (!(ReadFile(hfile, nametab, ne->ne_enttab - ne->ne_imptab, &len, NULL)))
 201       || (len != ne->ne_enttab - ne->ne_imptab) )
 202         goto broken;
 203
 204     for (i=0; i < ne->ne_cmod; i++)
 205     {
 206         LPSTR module = &nametab[modtab[i]];
 207         TRACE("modref: %.*s\n", module[0], &module[1]);
 208         if (!(strncmp(&module[1], "KERNEL", module[0])))
 209         { /* very old Windows file */
 210             MESSAGE("This seems to be a very old (pre-3.0) Windows executable. Expect crashes, especially if this is a real-mode binary !\n");
 211             ret = BINARY_WIN16;
 212             goto good;
 213         }
 214     }
 215
 216 broken:
 217     ERR("Hmm, an error occurred. Is this binary file broken?\n");
 218
 219 good:
 220     HeapFree( GetProcessHeap(), 0, modtab);
 221     HeapFree( GetProcessHeap(), 0, nametab);
 222     SetFilePointer( hfile, currpos, NULL, SEEK_SET); /* restore filepos */
 223     return ret;
 224 }
 225
 226 /***********************************************************************
 227  *           MODULE_GetBinaryType
 228  */
 229 void MODULE_get_binary_info( HANDLE hfile, struct binary_info *info )
 230 {
 231     union
 232     {
 233         struct
 234         {
 235             unsigned char magic[4];
 236             unsigned char class;
 237             unsigned char data;
 238             unsigned char version;
 239             unsigned char ignored[9];
 240             unsigned short type;
 241             unsigned short machine;
 242         } elf;
 243         struct
 244         {
 245             unsigned int magic;
 246             unsigned int cputype;
 247             unsigned int cpusubtype;
 248             unsigned int filetype;
 249         } macho;
 250         IMAGE_DOS_HEADER mz;
 251     } header;
 252
 253     DWORD len;
 254
 255     memset( info, 0, sizeof(*info) );
 256
 257     /* Seek to the start of the file and read the header information. */
 258     if (SetFilePointer( hfile, 0, NULL, SEEK_SET ) == -1) return;
 259     if (!ReadFile( hfile, &header, sizeof(header), &len, NULL ) || len != sizeof(header)) return;
 260
 261     if (!memcmp( header.elf.magic, "\177ELF", 4 ))
 262     {
 263         if (header.elf.class == 2) info->flags |= BINARY_FLAG_64BIT;
 264         /* FIXME: we don't bother to check byte order, architecture, etc. */
 265         switch(header.elf.type)
 266         {
 267         case 2: info->type = BINARY_UNIX_EXE; break;
 268         case 3: info->type = BINARY_UNIX_LIB; break;
 269         }
 270     }
 271     /* Mach-o File with Endian set to Big Endian or Little Endian */
 272     else if (header.macho.magic == 0xfeedface || header.macho.magic == 0xcefaedfe)
 273     {
 274         if ((header.macho.cputype >> 24) == 1) info->flags |= BINARY_FLAG_64BIT;
 275         switch(header.macho.filetype)
 276         {
 277         case 2: info->type = BINARY_UNIX_EXE; break;
 278         case 8: info->type = BINARY_UNIX_LIB; break;
 279         }
 280     }
 281     /* Not ELF, try DOS */
 282     else if (header.mz.e_magic == IMAGE_DOS_SIGNATURE)
 283     {
 284         union
 285         {
 286             IMAGE_OS2_HEADER os2;
 287             IMAGE_NT_HEADERS32 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         info->type = BINARY_DOS;
 298         if (SetFilePointer( hfile, header.mz.e_lfanew, NULL, SEEK_SET ) == -1) return;
 299         if (!ReadFile( hfile, &ext_header, sizeof(ext_header), &len, NULL ) || len < 4) return;
 300
 301         /* Reading the magic field succeeded so
 302          * we will try to determine what type it is.
 303          */
 304         if (!memcmp( &ext_header.nt.Signature, "PE\0\0", 4 ))
 305         {
 306             if (len >= sizeof(ext_header.nt.FileHeader))
 307             {
 308                 info->type = BINARY_PE;
 309                 if (ext_header.nt.FileHeader.Characteristics & IMAGE_FILE_DLL)
 310                     info->flags |= BINARY_FLAG_DLL;
 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                 switch (ext_header.nt.OptionalHeader.Magic)
 314                 {
 315                 case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
 316                     info->res_start = (void *)(ULONG_PTR)ext_header.nt.OptionalHeader.ImageBase;
 317                     info->res_end = (void *)((ULONG_PTR)ext_header.nt.OptionalHeader.ImageBase +
 318                                                      ext_header.nt.OptionalHeader.SizeOfImage);
 319                     break;
 320                 case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
 321                     info->flags |= BINARY_FLAG_64BIT;
 322                     break;
 323                 }
 324             }
 325         }
 326         else if (!memcmp( &ext_header.os2.ne_magic, "NE", 2 ))
 327         {
 328             /* This is a Windows executable (NE) header.  This can
 329              * mean either a 16-bit OS/2 or a 16-bit Windows or even a
 330              * DOS program (running under a DOS extender).  To decide
 331              * which, we'll have to read the NE header.
 332              */
 333             if (len >= sizeof(ext_header.os2))
 334             {
 335                 if (ext_header.os2.ne_flags & NE_FFLAGS_LIBMODULE) info->flags |= BINARY_FLAG_DLL;
 336                 switch ( ext_header.os2.ne_exetyp )
 337                 {
 338                 case 1:  info->type = BINARY_OS216; break; /* OS/2 */
 339                 case 2:  info->type = BINARY_WIN16; break; /* Windows */
 340                 case 3:  info->type = BINARY_DOS; break; /* European MS-DOS 4.x */
 341                 case 4:  info->type = BINARY_WIN16; break; /* Windows 386; FIXME: is this 32bit??? */
 342                 case 5:  info->type = BINARY_DOS; break; /* BOSS, Borland Operating System Services */
 343                 /* other types, e.g. 0 is: "unknown" */
 344                 default: info->type = MODULE_Decide_OS2_OldWin(hfile, &header.mz, &ext_header.os2); break;
 345                 }
 346             }
 347         }
 348     }
 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 subsystem 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     struct binary_info binary_info;
 389
 390     TRACE("%s\n", debugstr_w(lpApplicationName) );
 391
 392     /* Sanity check.
 393      */
 394     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 395         return FALSE;
 396
 397     /* Open the file indicated by lpApplicationName for reading.
 398      */
 399     hfile = CreateFileW( lpApplicationName, GENERIC_READ, FILE_SHARE_READ,
 400                          NULL, OPEN_EXISTING, 0, 0 );
 401     if ( hfile == INVALID_HANDLE_VALUE )
 402         return FALSE;
 403
 404     /* Check binary type
 405      */
 406     MODULE_get_binary_info( hfile, &binary_info );
 407     switch (binary_info.type)
 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:
 431         *lpBinaryType = (binary_info.flags & BINARY_FLAG_64BIT) ? SCS_64BIT_BINARY : SCS_32BIT_BINARY;
 432         ret = TRUE;
 433         break;
 434     case BINARY_WIN16:
 435         *lpBinaryType = SCS_WOW_BINARY;
 436         ret = TRUE;
 437         break;
 438     case BINARY_OS216:
 439         *lpBinaryType = SCS_OS216_BINARY;
 440         ret = TRUE;
 441         break;
 442     case BINARY_DOS:
 443         *lpBinaryType = SCS_DOS_BINARY;
 444         ret = TRUE;
 445         break;
 446     case BINARY_UNIX_EXE:
 447     case BINARY_UNIX_LIB:
 448         ret = FALSE;
 449         break;
 450     }
 451
 452     CloseHandle( hfile );
 453     return ret;
 454 }
 455
 456 /***********************************************************************
 457  *             GetBinaryTypeA                     [KERNEL32.@]
 458  *             GetBinaryType                      [KERNEL32.@]
 459  *
 460  * See GetBinaryTypeW.
 461  */
 462 BOOL WINAPI GetBinaryTypeA( LPCSTR lpApplicationName, LPDWORD lpBinaryType )
 463 {
 464     ANSI_STRING app_nameA;
 465     NTSTATUS status;
 466
 467     TRACE("%s\n", debugstr_a(lpApplicationName));
 468
 469     /* Sanity check.
 470      */
 471     if ( lpApplicationName == NULL || lpBinaryType == NULL )
 472         return FALSE;
 473
 474     RtlInitAnsiString(&app_nameA, lpApplicationName);
 475     status = RtlAnsiStringToUnicodeString(&NtCurrentTeb()->StaticUnicodeString,
 476                                           &app_nameA, FALSE);
 477     if (!status)
 478         return GetBinaryTypeW(NtCurrentTeb()->StaticUnicodeString.Buffer, lpBinaryType);
 479
 480     SetLastError(RtlNtStatusToDosError(status));
 481     return FALSE;
 482 }
 483
 484 /***********************************************************************
 485  *              GetModuleHandleExA         (KERNEL32.@)
 486  */
 487 BOOL WINAPI GetModuleHandleExA( DWORD flags, LPCSTR name, HMODULE *module )
 488 {
 489     WCHAR *nameW;
 490
 491     if (!name || (flags & GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS))
 492         return GetModuleHandleExW( flags, (LPCWSTR)name, module );
 493
 494     if (!(nameW = FILE_name_AtoW( name, FALSE ))) return FALSE;
 495     return GetModuleHandleExW( flags, nameW, module );
 496 }
 497
 498 /***********************************************************************
 499  *              GetModuleHandleExW         (KERNEL32.@)
 500  */
 501 BOOL WINAPI GetModuleHandleExW( DWORD flags, LPCWSTR name, HMODULE *module )
 502 {
 503     NTSTATUS status = STATUS_SUCCESS;
 504     HMODULE ret;
 505     ULONG magic;
 506
 507     /* if we are messing with the refcount, grab the loader lock */
 508     if ((flags & GET_MODULE_HANDLE_EX_FLAG_PIN) ||
 509         !(flags & GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT))
 510         LdrLockLoaderLock( 0, NULL, &magic );
 511
 512     if (!name)
 513     {
 514         ret = NtCurrentTeb()->Peb->ImageBaseAddress;
 515     }
 516     else if (flags & GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS)
 517     {
 518         void *dummy;
 519         if (!(ret = RtlPcToFileHeader( (void *)name, &dummy ))) status = STATUS_DLL_NOT_FOUND;
 520     }
 521     else
 522     {
 523         UNICODE_STRING wstr;
 524         RtlInitUnicodeString( &wstr, name );
 525         status = LdrGetDllHandle( NULL, 0, &wstr, &ret );
 526     }
 527
 528     if (status == STATUS_SUCCESS)
 529     {
 530         if (flags & GET_MODULE_HANDLE_EX_FLAG_PIN)
 531             FIXME( "should pin refcount for %p\n", ret );
 532         else if (!(flags & GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT))
 533             LdrAddRefDll( 0, ret );
 534     }
 535     else SetLastError( RtlNtStatusToDosError( status ) );
 536
 537     if ((flags & GET_MODULE_HANDLE_EX_FLAG_PIN) ||
 538         !(flags & GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT))
 539         LdrUnlockLoaderLock( 0, magic );
 540
 541     if (module) *module = ret;
 542     return (status == STATUS_SUCCESS);
 543 }
 544
 545 /***********************************************************************
 546  *              GetModuleHandleA         (KERNEL32.@)
 547  *
 548  * Get the handle of a dll loaded into the process address space.
 549  *
 550  * PARAMS
 551  *  module [I] Name of the dll
 552  *
 553  * RETURNS
 554  *  Success: A handle to the loaded dll.
 555  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 556  */
 557 HMODULE WINAPI GetModuleHandleA(LPCSTR module)
 558 {
 559     HMODULE ret;
 560
 561     if (!GetModuleHandleExA( GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, module, &ret )) ret = 0;
 562     return ret;
 563 }
 564
 565 /***********************************************************************
 566  *              GetModuleHandleW (KERNEL32.@)
 567  *
 568  * Unicode version of GetModuleHandleA.
 569  */
 570 HMODULE WINAPI GetModuleHandleW(LPCWSTR module)
 571 {
 572     HMODULE ret;
 573
 574     if (!GetModuleHandleExW( GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, module, &ret )) ret = 0;
 575     return ret;
 576 }
 577
 578
 579 /***********************************************************************
 580  *              GetModuleFileNameA      (KERNEL32.@)
 581  *
 582  * Get the file name of a loaded module from its handle.
 583  *
 584  * RETURNS
 585  *  Success: The length of the file name, excluding the terminating NUL.
 586  *  Failure: 0. Use GetLastError() to determine the cause.
 587  *
 588  * NOTES
 589  *  This function always returns the long path of hModule (as opposed to
 590  *  GetModuleFileName16() which returns short paths when the modules version
 591  *  field is < 4.0).
 592  *  The function doesn't write a terminating '\0' if the buffer is too
 593  *  small.
 594  */
 595 DWORD WINAPI GetModuleFileNameA(
 596         HMODULE hModule,        /* [in] Module handle (32 bit) */
 597         LPSTR lpFileName,       /* [out] Destination for file name */
 598         DWORD size )            /* [in] Size of lpFileName in characters */
 599 {
 600     LPWSTR filenameW = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
 601     DWORD len;
 602
 603     if (!filenameW)
 604     {
 605         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 606         return 0;
 607     }
 608     if ((len = GetModuleFileNameW( hModule, filenameW, size )))
 609     {
 610         len = FILE_name_WtoA( filenameW, len, lpFileName, size );
 611         if (len < size)
 612             lpFileName[len] = '\0';
 613         else
 614             SetLastError( ERROR_INSUFFICIENT_BUFFER );
 615     }
 616     HeapFree( GetProcessHeap(), 0, filenameW );
 617     return len;
 618 }
 619
 620 /***********************************************************************
 621  *              GetModuleFileNameW      (KERNEL32.@)
 622  *
 623  * Unicode version of GetModuleFileNameA.
 624  */
 625 DWORD WINAPI GetModuleFileNameW( HMODULE hModule, LPWSTR lpFileName, DWORD size )
 626 {
 627     ULONG magic, len = 0;
 628     LDR_MODULE *pldr;
 629     NTSTATUS nts;
 630     WIN16_SUBSYSTEM_TIB *win16_tib;
 631
 632     if (!hModule && ((win16_tib = NtCurrentTeb()->Tib.SubSystemTib)) && win16_tib->exe_name)
 633     {
 634         len = min(size, win16_tib->exe_name->Length / sizeof(WCHAR));
 635         memcpy( lpFileName, win16_tib->exe_name->Buffer, len * sizeof(WCHAR) );
 636         if (len < size) lpFileName[len] = '\0';
 637         goto done;
 638     }
 639
 640     LdrLockLoaderLock( 0, NULL, &magic );
 641
 642     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
 643     nts = LdrFindEntryForAddress( hModule, &pldr );
 644     if (nts == STATUS_SUCCESS)
 645     {
 646         len = min(size, pldr->FullDllName.Length / sizeof(WCHAR));
 647         memcpy(lpFileName, pldr->FullDllName.Buffer, len * sizeof(WCHAR));
 648         if (len < size)
 649             lpFileName[len] = '\0';
 650         else
 651             SetLastError( ERROR_INSUFFICIENT_BUFFER );
 652     }
 653     else SetLastError( RtlNtStatusToDosError( nts ) );
 654
 655     LdrUnlockLoaderLock( 0, magic );
 656 done:
 657     TRACE( "%s\n", debugstr_wn(lpFileName, len) );
 658     return len;
 659 }
 660
 661
 662 /***********************************************************************
 663  *           get_dll_system_path
 664  */
 665 static const WCHAR *get_dll_system_path(void)
 666 {
 667     static WCHAR *cached_path;
 668
 669     if (!cached_path)
 670     {
 671         WCHAR *p, *path;
 672         int len = 3;
 673
 674         len += 2 * GetSystemDirectoryW( NULL, 0 );
 675         len += GetWindowsDirectoryW( NULL, 0 );
 676         p = path = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 677         *p++ = '.';
 678         *p++ = ';';
 679         GetSystemDirectoryW( p, path + len - p);
 680         p += strlenW(p);
 681         /* if system directory ends in "32" add 16-bit version too */
 682         if (p[-2] == '3' && p[-1] == '2')
 683         {
 684             *p++ = ';';
 685             GetSystemDirectoryW( p, path + len - p);
 686             p += strlenW(p) - 2;
 687         }
 688         *p++ = ';';
 689         GetWindowsDirectoryW( p, path + len - p);
 690         cached_path = path;
 691     }
 692     return cached_path;
 693 }
 694
 695 /******************************************************************
 696  *              get_module_path_end
 697  *
 698  * Returns the end of the directory component of the module path.
 699  */
 700 static inline const WCHAR *get_module_path_end(const WCHAR *module)
 701 {
 702     const WCHAR *p;
 703     const WCHAR *mod_end = module;
 704     if (!module) return mod_end;
 705
 706     if ((p = strrchrW( mod_end, '\\' ))) mod_end = p;
 707     if ((p = strrchrW( mod_end, '/' ))) mod_end = p;
 708     if (mod_end == module + 2 && module[1] == ':') mod_end++;
 709     if (mod_end == module && module[0] && module[1] == ':') mod_end += 2;
 710
 711     return mod_end;
 712 }
 713
 714 /******************************************************************
 715  *              MODULE_get_dll_load_path
 716  *
 717  * Compute the load path to use for a given dll.
 718  * Returned pointer must be freed by caller.
 719  */
 720 WCHAR *MODULE_get_dll_load_path( LPCWSTR module )
 721 {
 722     static const WCHAR pathW[] = {'P','A','T','H',0};
 723
 724     const WCHAR *system_path = get_dll_system_path();
 725     const WCHAR *mod_end = NULL;
 726     UNICODE_STRING name, value;
 727     WCHAR *p, *ret;
 728     int len = 0, path_len = 0;
 729
 730     /* adjust length for module name */
 731
 732     if (module)
 733         mod_end = get_module_path_end( module );
 734     /* if module is NULL or doesn't contain a path, fall back to directory
 735      * process was loaded from */
 736     if (module == mod_end)
 737     {
 738         module = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
 739         mod_end = get_module_path_end( module );
 740     }
 741     len += (mod_end - module) + 1;
 742
 743     len += strlenW( system_path ) + 2;
 744
 745     /* get the PATH variable */
 746
 747     RtlInitUnicodeString( &name, pathW );
 748     value.Length = 0;
 749     value.MaximumLength = 0;
 750     value.Buffer = NULL;
 751     if (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 752         path_len = value.Length;
 753
 754     RtlEnterCriticalSection( &dlldir_section );
 755     if (dll_directory) len += strlenW(dll_directory) + 1;
 756     if ((p = ret = HeapAlloc( GetProcessHeap(), 0, path_len + len * sizeof(WCHAR) )))
 757     {
 758         if (module)
 759         {
 760             memcpy( ret, module, (mod_end - module) * sizeof(WCHAR) );
 761             p += (mod_end - module);
 762             *p++ = ';';
 763         }
 764         if (dll_directory)
 765         {
 766             strcpyW( p, dll_directory );
 767             p += strlenW(p);
 768             *p++ = ';';
 769         }
 770     }
 771     RtlLeaveCriticalSection( &dlldir_section );
 772     if (!ret) return NULL;
 773
 774     strcpyW( p, system_path );
 775     p += strlenW(p);
 776     *p++ = ';';
 777     value.Buffer = p;
 778     value.MaximumLength = path_len;
 779
 780     while (RtlQueryEnvironmentVariable_U( NULL, &name, &value ) == STATUS_BUFFER_TOO_SMALL)
 781     {
 782         WCHAR *new_ptr;
 783
 784         /* grow the buffer and retry */
 785         path_len = value.Length;
 786         if (!(new_ptr = HeapReAlloc( GetProcessHeap(), 0, ret, path_len + len * sizeof(WCHAR) )))
 787         {
 788             HeapFree( GetProcessHeap(), 0, ret );
 789             return NULL;
 790         }
 791         value.Buffer = new_ptr + (value.Buffer - ret);
 792         value.MaximumLength = path_len;
 793         ret = new_ptr;
 794     }
 795     value.Buffer[value.Length / sizeof(WCHAR)] = 0;
 796     return ret;
 797 }
 798
 799
 800 /******************************************************************
 801  *              load_library_as_datafile
 802  */
 803 static BOOL load_library_as_datafile( LPCWSTR name, HMODULE* hmod)
 804 {
 805     static const WCHAR dotDLL[] = {'.','d','l','l',0};
 806
 807     WCHAR filenameW[MAX_PATH];
 808     HANDLE hFile = INVALID_HANDLE_VALUE;
 809     HANDLE mapping;
 810     HMODULE module;
 811
 812     *hmod = 0;
 813
 814     if (SearchPathW( NULL, name, dotDLL, sizeof(filenameW) / sizeof(filenameW[0]),
 815                      filenameW, NULL ))
 816     {
 817         hFile = CreateFileW( filenameW, GENERIC_READ, FILE_SHARE_READ,
 818                              NULL, OPEN_EXISTING, 0, 0 );
 819     }
 820     if (hFile == INVALID_HANDLE_VALUE) return FALSE;
 821
 822     mapping = CreateFileMappingW( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
 823     CloseHandle( hFile );
 824     if (!mapping) return FALSE;
 825
 826     module = MapViewOfFile( mapping, FILE_MAP_READ, 0, 0, 0 );
 827     CloseHandle( mapping );
 828     if (!module) return FALSE;
 829
 830     /* make sure it's a valid PE file */
 831     if (!RtlImageNtHeader(module))
 832     {
 833         UnmapViewOfFile( module );
 834         return FALSE;
 835     }
 836     *hmod = (HMODULE)((char *)module + 1);  /* set low bit of handle to indicate datafile module */
 837     return TRUE;
 838 }
 839
 840
 841 /******************************************************************
 842  *              load_library
 843  *
 844  * Helper for LoadLibraryExA/W.
 845  */
 846 static HMODULE load_library( const UNICODE_STRING *libname, DWORD flags )
 847 {
 848     NTSTATUS nts;
 849     HMODULE hModule;
 850     WCHAR *load_path;
 851
 852     load_path = MODULE_get_dll_load_path( flags & LOAD_WITH_ALTERED_SEARCH_PATH ? libname->Buffer : NULL );
 853
 854     if (flags & LOAD_LIBRARY_AS_DATAFILE)
 855     {
 856         ULONG magic;
 857
 858         LdrLockLoaderLock( 0, NULL, &magic );
 859         if (!(nts = LdrGetDllHandle( load_path, flags, libname, &hModule )))
 860         {
 861             LdrAddRefDll( 0, hModule );
 862             LdrUnlockLoaderLock( 0, magic );
 863             goto done;
 864         }
 865         LdrUnlockLoaderLock( 0, magic );
 866
 867         /* The method in load_library_as_datafile allows searching for the
 868          * 'native' libraries only
 869          */
 870         if (load_library_as_datafile( libname->Buffer, &hModule )) goto done;
 871         flags |= DONT_RESOLVE_DLL_REFERENCES; /* Just in case */
 872         /* Fallback to normal behaviour */
 873     }
 874
 875     nts = LdrLoadDll( load_path, flags, libname, &hModule );
 876     if (nts != STATUS_SUCCESS)
 877     {
 878         hModule = 0;
 879         SetLastError( RtlNtStatusToDosError( nts ) );
 880     }
 881 done:
 882     HeapFree( GetProcessHeap(), 0, load_path );
 883     return hModule;
 884 }
 885
 886
 887 /******************************************************************
 888  *              LoadLibraryExA          (KERNEL32.@)
 889  *
 890  * Load a dll file into the process address space.
 891  *
 892  * PARAMS
 893  *  libname [I] Name of the file to load
 894  *  hfile   [I] Reserved, must be 0.
 895  *  flags   [I] Flags for loading the dll
 896  *
 897  * RETURNS
 898  *  Success: A handle to the loaded dll.
 899  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 900  *
 901  * NOTES
 902  * The HFILE parameter is not used and marked reserved in the SDK. I can
 903  * only guess that it should force a file to be mapped, but I rather
 904  * ignore the parameter because it would be extremely difficult to
 905  * integrate this with different types of module representations.
 906  */
 907 HMODULE WINAPI DECLSPEC_HOTPATCH LoadLibraryExA(LPCSTR libname, HANDLE hfile, DWORD flags)
 908 {
 909     WCHAR *libnameW;
 910
 911     if (!(libnameW = FILE_name_AtoW( libname, FALSE ))) return 0;
 912     return LoadLibraryExW( libnameW, hfile, flags );
 913 }
 914
 915 /***********************************************************************
 916  *           LoadLibraryExW       (KERNEL32.@)
 917  *
 918  * Unicode version of LoadLibraryExA.
 919  */
 920 HMODULE WINAPI DECLSPEC_HOTPATCH LoadLibraryExW(LPCWSTR libnameW, HANDLE hfile, DWORD flags)
 921 {
 922     UNICODE_STRING      wstr;
 923     HMODULE             res;
 924
 925     if (!libnameW)
 926     {
 927         SetLastError(ERROR_INVALID_PARAMETER);
 928         return 0;
 929     }
 930     RtlInitUnicodeString( &wstr, libnameW );
 931     if (wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] != ' ')
 932         return load_library( &wstr, flags );
 933
 934     /* Library name has trailing spaces */
 935     RtlCreateUnicodeString( &wstr, libnameW );
 936     while (wstr.Length > sizeof(WCHAR) &&
 937            wstr.Buffer[wstr.Length/sizeof(WCHAR) - 1] == ' ')
 938     {
 939         wstr.Length -= sizeof(WCHAR);
 940     }
 941     wstr.Buffer[wstr.Length/sizeof(WCHAR)] = '\0';
 942     res = load_library( &wstr, flags );
 943     RtlFreeUnicodeString( &wstr );
 944     return res;
 945 }
 946
 947 /***********************************************************************
 948  *           LoadLibraryA         (KERNEL32.@)
 949  *
 950  * Load a dll file into the process address space.
 951  *
 952  * PARAMS
 953  *  libname [I] Name of the file to load
 954  *
 955  * RETURNS
 956  *  Success: A handle to the loaded dll.
 957  *  Failure: A NULL handle. Use GetLastError() to determine the cause.
 958  *
 959  * NOTES
 960  * See LoadLibraryExA().
 961  */
 962 HMODULE WINAPI DECLSPEC_HOTPATCH LoadLibraryA(LPCSTR libname)
 963 {
 964     return LoadLibraryExA(libname, 0, 0);
 965 }
 966
 967 /***********************************************************************
 968  *           LoadLibraryW         (KERNEL32.@)
 969  *
 970  * Unicode version of LoadLibraryA.
 971  */
 972 HMODULE WINAPI DECLSPEC_HOTPATCH LoadLibraryW(LPCWSTR libnameW)
 973 {
 974     return LoadLibraryExW(libnameW, 0, 0);
 975 }
 976
 977 /***********************************************************************
 978  *           FreeLibrary   (KERNEL32.@)
 979  *
 980  * Free a dll loaded into the process address space.
 981  *
 982  * PARAMS
 983  *  hLibModule [I] Handle to the dll returned by LoadLibraryA().
 984  *
 985  * RETURNS
 986  *  Success: TRUE. The dll is removed if it is not still in use.
 987  *  Failure: FALSE. Use GetLastError() to determine the cause.
 988  */
 989 BOOL WINAPI DECLSPEC_HOTPATCH FreeLibrary(HINSTANCE hLibModule)
 990 {
 991     BOOL                retv = FALSE;
 992     NTSTATUS            nts;
 993
 994     if (!hLibModule)
 995     {
 996         SetLastError( ERROR_INVALID_HANDLE );
 997         return FALSE;
 998     }
 999
1000     if ((ULONG_PTR)hLibModule & 1)
1001     {
1002         /* this is a LOAD_LIBRARY_AS_DATAFILE module */
1003         char *ptr = (char *)hLibModule - 1;
1004         UnmapViewOfFile( ptr );
1005         return TRUE;
1006     }
1007
1008     if ((nts = LdrUnloadDll( hLibModule )) == STATUS_SUCCESS) retv = TRUE;
1009     else SetLastError( RtlNtStatusToDosError( nts ) );
1010
1011     return retv;
1012 }
1013
1014 /***********************************************************************
1015  *           GetProcAddress             (KERNEL32.@)
1016  *
1017  * Find the address of an exported symbol in a loaded dll.
1018  *
1019  * PARAMS
1020  *  hModule  [I] Handle to the dll returned by LoadLibraryA().
1021  *  function [I] Name of the symbol, or an integer ordinal number < 16384
1022  *
1023  * RETURNS
1024  *  Success: A pointer to the symbol in the process address space.
1025  *  Failure: NULL. Use GetLastError() to determine the cause.
1026  */
1027 FARPROC WINAPI GetProcAddress( HMODULE hModule, LPCSTR function )
1028 {
1029     NTSTATUS    nts;
1030     FARPROC     fp;
1031
1032     if (!hModule) hModule = NtCurrentTeb()->Peb->ImageBaseAddress;
1033
1034     if (HIWORD(function))
1035     {
1036         ANSI_STRING     str;
1037
1038         RtlInitAnsiString( &str, function );
1039         nts = LdrGetProcedureAddress( hModule, &str, 0, (void**)&fp );
1040     }
1041     else
1042         nts = LdrGetProcedureAddress( hModule, NULL, LOWORD(function), (void**)&fp );
1043     if (nts != STATUS_SUCCESS)
1044     {
1045         SetLastError( RtlNtStatusToDosError( nts ) );
1046         fp = NULL;
1047     }
1048     return fp;
1049 }
1050
1051 /***********************************************************************
1052  *           DelayLoadFailureHook  (KERNEL32.@)
1053  */
1054 FARPROC WINAPI DelayLoadFailureHook( LPCSTR name, LPCSTR function )
1055 {
1056     ULONG_PTR args[2];
1057
1058     if ((ULONG_PTR)function >> 16)
1059         ERR( "failed to delay load %s.%s\n", name, function );
1060     else
1061         ERR( "failed to delay load %s.%u\n", name, LOWORD(function) );
1062     args[0] = (ULONG_PTR)name;
1063     args[1] = (ULONG_PTR)function;
1064     RaiseException( EXCEPTION_WINE_STUB, EH_NONCONTINUABLE, 2, args );
1065     return NULL;
1066 }