1 /*
2 * Win32 virtual memory functions
3 *
4 * Copyright 1997 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 <stdarg.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
33 #define NONAMELESSUNION
34 #define NONAMELESSSTRUCT
35 #include "ntstatus.h"
36 #define WIN32_NO_STATUS
37 #include "windef.h"
38 #include "winbase.h"
39 #include "winnls.h"
40 #include "winternl.h"
41 #include "winerror.h"
42 #include "wine/exception.h"
43 #include "wine/debug.h"
44
45 #include "kernel_private.h"
46
47 WINE_DECLARE_DEBUG_CHANNEL(seh);
48
49 static unsigned int page_size;
50
51
52 /***********************************************************************
53 * VirtualAlloc (KERNEL32.@)
54 *
55 * Reserves or commits a region of pages in virtual address space.
56 *
57 * PARAMS
58 * addr [I] Address of region to reserve or commit.
59 * size [I] Size of region.
60 * type [I] Type of allocation.
61 * protect [I] Type of access protection.
62 *
63 * RETURNS
64 * Success: Base address of allocated region of pages.
65 * Failure: NULL.
66 */
67 LPVOID WINAPI VirtualAlloc( LPVOID addr, SIZE_T size, DWORD type, DWORD protect )
68 {
69 return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
70 }
71
72
73 /***********************************************************************
74 * VirtualAllocEx (KERNEL32.@)
75 *
76 * Seems to be just as VirtualAlloc, but with process handle.
77 *
78 * PARAMS
79 * hProcess [I] Handle to process to do mem operation.
80 * addr [I] Address of region to reserve or commit.
81 * size [I] Size of region.
82 * type [I] Type of allocation.
83 * protect [I] Type of access protection.
84 *
85 *
86 * RETURNS
87 * Success: Base address of allocated region of pages.
88 * Failure: NULL.
89 */
90 LPVOID WINAPI VirtualAllocEx( HANDLE hProcess, LPVOID addr, SIZE_T size,
91 DWORD type, DWORD protect )
92 {
93 LPVOID ret = addr;
94 NTSTATUS status;
95
96 if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
97 {
98 SetLastError( RtlNtStatusToDosError(status) );
99 ret = NULL;
100 }
101 return ret;
102 }
103
104
105 /***********************************************************************
106 * VirtualFree (KERNEL32.@)
107 *
108 * Releases or decommits a region of pages in virtual address space.
109 *
110 * PARAMS
111 * addr [I] Address of region of committed pages.
112 * size [I] Size of region.
113 * type [I] Type of operation.
114 *
115 * RETURNS
116 * Success: TRUE.
117 * Failure: FALSE.
118 */
119 BOOL WINAPI VirtualFree( LPVOID addr, SIZE_T size, DWORD type )
120 {
121 return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
122 }
123
124
125 /***********************************************************************
126 * VirtualFreeEx (KERNEL32.@)
127 *
128 * Releases or decommits a region of pages in virtual address space.
129 *
130 * PARAMS
131 * process [I] Handle to process.
132 * addr [I] Address of region to free.
133 * size [I] Size of region.
134 * type [I] Type of operation.
135 *
136 * RETURNS
137 * Success: TRUE.
138 * Failure: FALSE.
139 */
140 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
141 {
142 NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
143 if (status) SetLastError( RtlNtStatusToDosError(status) );
144 return !status;
145 }
146
147
148 /***********************************************************************
149 * VirtualLock (KERNEL32.@)
150 *
151 * Locks the specified region of virtual address space.
152 *
153 * PARAMS
154 * addr [I] Address of first byte of range to lock.
155 * size [I] Number of bytes in range to lock.
156 *
157 * RETURNS
158 * Success: TRUE.
159 * Failure: FALSE.
160 *
161 * NOTES
162 * Always returns TRUE.
163 *
164 */
165 BOOL WINAPI VirtualLock( LPVOID addr, SIZE_T size )
166 {
167 NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
168 if (status) SetLastError( RtlNtStatusToDosError(status) );
169 return !status;
170 }
171
172
173 /***********************************************************************
174 * VirtualUnlock (KERNEL32.@)
175 *
176 * Unlocks a range of pages in the virtual address space.
177 *
178 * PARAMS
179 * addr [I] Address of first byte of range.
180 * size [I] Number of bytes in range.
181 *
182 * RETURNS
183 * Success: TRUE.
184 * Failure: FALSE.
185 *
186 * NOTES
187 * Always returns TRUE.
188 *
189 */
190 BOOL WINAPI VirtualUnlock( LPVOID addr, SIZE_T size )
191 {
192 NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
193 if (status) SetLastError( RtlNtStatusToDosError(status) );
194 return !status;
195 }
196
197
198 /***********************************************************************
199 * VirtualProtect (KERNEL32.@)
200 *
201 * Changes the access protection on a region of committed pages.
202 *
203 * PARAMS
204 * addr [I] Address of region of committed pages.
205 * size [I] Size of region.
206 * new_prot [I] Desired access protection.
207 * old_prot [O] Address of variable to get old protection.
208 *
209 * RETURNS
210 * Success: TRUE.
211 * Failure: FALSE.
212 */
213 BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD old_prot)
214 {
215 return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
216 }
217
218
219 /***********************************************************************
220 * VirtualProtectEx (KERNEL32.@)
221 *
222 * Changes the access protection on a region of committed pages in the
223 * virtual address space of a specified process.
224 *
225 * PARAMS
226 * process [I] Handle of process.
227 * addr [I] Address of region of committed pages.
228 * size [I] Size of region.
229 * new_prot [I] Desired access protection.
230 * old_prot [O] Address of variable to get old protection.
231 *
232 * RETURNS
233 * Success: TRUE.
234 * Failure: FALSE.
235 */
236 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
237 DWORD new_prot, LPDWORD old_prot )
238 {
239 NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
240 if (status) SetLastError( RtlNtStatusToDosError(status) );
241 return !status;
242 }
243
244
245 /***********************************************************************
246 * VirtualQuery (KERNEL32.@)
247 *
248 * Provides info about a range of pages in virtual address space.
249 *
250 * PARAMS
251 * addr [I] Address of region.
252 * info [O] Address of info buffer.
253 * len [I] Size of buffer.
254 *
255 * RETURNS
256 * Number of bytes returned in information buffer or 0 if
257 * addr >= 0xc0000000 (kernel space).
258 */
259 SIZE_T WINAPI VirtualQuery( LPCVOID addr, PMEMORY_BASIC_INFORMATION info,
260 SIZE_T len )
261 {
262 return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
263 }
264
265
266 /***********************************************************************
267 * VirtualQueryEx (KERNEL32.@)
268 *
269 * Provides info about a range of pages in virtual address space of a
270 * specified process.
271 *
272 * PARAMS
273 * process [I] Handle to process.
274 * addr [I] Address of region.
275 * info [O] Address of info buffer.
276 * len [I] Size of buffer.
277 *
278 * RETURNS
279 * Number of bytes returned in information buffer.
280 */
281 SIZE_T WINAPI VirtualQueryEx( HANDLE process, LPCVOID addr,
282 PMEMORY_BASIC_INFORMATION info, SIZE_T len )
283 {
284 SIZE_T ret;
285 NTSTATUS status;
286
287 if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
288 {
289 SetLastError( RtlNtStatusToDosError(status) );
290 ret = 0;
291 }
292 return ret;
293 }
294
295
296 /***********************************************************************
297 * CreateFileMappingA (KERNEL32.@)
298 *
299 * Creates a named or unnamed file-mapping object for the specified file.
300 *
301 * PARAMS
302 * hFile [I] Handle to the file to map.
303 * sa [I] Optional security attributes.
304 * protect [I] Protection for mapping object.
305 * size_high [I] High-order 32 bits of object size.
306 * size_low [I] Low-order 32 bits of object size.
307 * name [I] Name of file-mapping object.
308 *
309 * RETURNS
310 * Success: Handle.
311 * Failure: NULL. Mapping object does not exist.
312 */
313 HANDLE WINAPI CreateFileMappingA( HANDLE hFile, SECURITY_ATTRIBUTES *sa,
314 DWORD protect, DWORD size_high, DWORD size_low, LPCSTR name )
315 {
316 WCHAR buffer[MAX_PATH];
317
318 if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
319
320 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
321 {
322 SetLastError( ERROR_FILENAME_EXCED_RANGE );
323 return 0;
324 }
325 return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
326 }
327
328
329 /***********************************************************************
330 * CreateFileMappingW (KERNEL32.@)
331 *
332 * See CreateFileMappingA.
333 */
334 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
335 DWORD protect, DWORD size_high,
336 DWORD size_low, LPCWSTR name )
337 {
338 static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
339
340 HANDLE ret;
341 OBJECT_ATTRIBUTES attr;
342 UNICODE_STRING nameW;
343 NTSTATUS status;
344 DWORD access, sec_type;
345 LARGE_INTEGER size;
346
347 attr.Length = sizeof(attr);
348 attr.RootDirectory = 0;
349 attr.ObjectName = NULL;
350 attr.Attributes = OBJ_OPENIF | ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
351 attr.SecurityDescriptor = sa ? sa->lpSecurityDescriptor : NULL;
352 attr.SecurityQualityOfService = NULL;
353
354 if (name)
355 {
356 RtlInitUnicodeString( &nameW, name );
357 attr.ObjectName = &nameW;
358 attr.RootDirectory = get_BaseNamedObjects_handle();
359 }
360
361 sec_type = protect & sec_flags;
362 protect &= ~sec_flags;
363 if (!sec_type) sec_type = SEC_COMMIT;
364
365 switch(protect)
366 {
367 case 0:
368 protect = PAGE_READONLY; /* Win9x compatibility */
369 /* fall through */
370 case PAGE_READONLY:
371 case PAGE_WRITECOPY:
372 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ;
373 break;
374 case PAGE_READWRITE:
375 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE;
376 break;
377 case PAGE_EXECUTE:
378 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_EXECUTE;
379 break;
380 case PAGE_EXECUTE_READ:
381 case PAGE_EXECUTE_WRITECOPY:
382 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE;
383 break;
384 case PAGE_EXECUTE_READWRITE:
385 access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE;
386 break;
387 default:
388 SetLastError( ERROR_INVALID_PARAMETER );
389 return 0;
390 }
391
392 if (hFile == INVALID_HANDLE_VALUE)
393 {
394 hFile = 0;
395 if (!size_low && !size_high)
396 {
397 SetLastError( ERROR_INVALID_PARAMETER );
398 return 0;
399 }
400 }
401
402 size.u.LowPart = size_low;
403 size.u.HighPart = size_high;
404
405 status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
406 if (status == STATUS_OBJECT_NAME_EXISTS)
407 SetLastError( ERROR_ALREADY_EXISTS );
408 else
409 SetLastError( RtlNtStatusToDosError(status) );
410 return ret;
411 }
412
413
414 /***********************************************************************
415 * OpenFileMappingA (KERNEL32.@)
416 *
417 * Opens a named file-mapping object.
418 *
419 * PARAMS
420 * access [I] Access mode.
421 * inherit [I] Inherit flag.
422 * name [I] Name of file-mapping object.
423 *
424 * RETURNS
425 * Success: Handle.
426 * Failure: NULL.
427 */
428 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
429 {
430 WCHAR buffer[MAX_PATH];
431
432 if (!name) return OpenFileMappingW( access, inherit, NULL );
433
434 if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
435 {
436 SetLastError( ERROR_FILENAME_EXCED_RANGE );
437 return 0;
438 }
439 return OpenFileMappingW( access, inherit, buffer );
440 }
441
442
443 /***********************************************************************
444 * OpenFileMappingW (KERNEL32.@)
445 *
446 * See OpenFileMappingA.
447 */
448 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
449 {
450 OBJECT_ATTRIBUTES attr;
451 UNICODE_STRING nameW;
452 HANDLE ret;
453 NTSTATUS status;
454
455 if (!name)
456 {
457 SetLastError( ERROR_INVALID_PARAMETER );
458 return 0;
459 }
460 attr.Length = sizeof(attr);
461 attr.RootDirectory = get_BaseNamedObjects_handle();
462 attr.ObjectName = &nameW;
463 attr.Attributes = inherit ? OBJ_INHERIT : 0;
464 attr.SecurityDescriptor = NULL;
465 attr.SecurityQualityOfService = NULL;
466 RtlInitUnicodeString( &nameW, name );
467
468 if (access == FILE_MAP_COPY) access = FILE_MAP_READ;
469
470 if ((status = NtOpenSection( &ret, access, &attr )))
471 {
472 SetLastError( RtlNtStatusToDosError(status) );
473 ret = 0;
474 }
475 return ret;
476 }
477
478
479 /***********************************************************************
480 * MapViewOfFile (KERNEL32.@)
481 *
482 * Maps a view of a file into the address space.
483 *
484 * PARAMS
485 * mapping [I] File-mapping object to map.
486 * access [I] Access mode.
487 * offset_high [I] High-order 32 bits of file offset.
488 * offset_low [I] Low-order 32 bits of file offset.
489 * count [I] Number of bytes to map.
490 *
491 * RETURNS
492 * Success: Starting address of mapped view.
493 * Failure: NULL.
494 */
495 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
496 DWORD offset_high, DWORD offset_low, SIZE_T count )
497 {
498 return MapViewOfFileEx( mapping, access, offset_high,
499 offset_low, count, NULL );
500 }
501
502
503 /***********************************************************************
504 * MapViewOfFileEx (KERNEL32.@)
505 *
506 * Maps a view of a file into the address space.
507 *
508 * PARAMS
509 * handle [I] File-mapping object to map.
510 * access [I] Access mode.
511 * offset_high [I] High-order 32 bits of file offset.
512 * offset_low [I] Low-order 32 bits of file offset.
513 * count [I] Number of bytes to map.
514 * addr [I] Suggested starting address for mapped view.
515 *
516 * RETURNS
517 * Success: Starting address of mapped view.
518 * Failure: NULL.
519 */
520 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
521 DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
522 {
523 NTSTATUS status;
524 LARGE_INTEGER offset;
525 ULONG protect;
526
527 offset.u.LowPart = offset_low;
528 offset.u.HighPart = offset_high;
529
530 if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
531 else if (access & FILE_MAP_READ) protect = PAGE_READONLY;
532 else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
533 else protect = PAGE_NOACCESS;
534
535 if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
536 &count, ViewShare, 0, protect )))
537 {
538 SetLastError( RtlNtStatusToDosError(status) );
539 addr = NULL;
540 }
541 return addr;
542 }
543
544
545 /***********************************************************************
546 * UnmapViewOfFile (KERNEL32.@)
547 *
548 * Unmaps a mapped view of a file.
549 *
550 * PARAMS
551 * addr [I] Address where mapped view begins.
552 *
553 * RETURNS
554 * Success: TRUE.
555 * Failure: FALSE.
556 *
557 */
558 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
559 {
560 NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
561 if (status) SetLastError( RtlNtStatusToDosError(status) );
562 return !status;
563 }
564
565
566 /***********************************************************************
567 * FlushViewOfFile (KERNEL32.@)
568 *
569 * Writes to the disk a byte range within a mapped view of a file.
570 *
571 * PARAMS
572 * base [I] Start address of byte range to flush.
573 * size [I] Number of bytes in range.
574 *
575 * RETURNS
576 * Success: TRUE.
577 * Failure: FALSE.
578 */
579 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
580 {
581 NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
582 if (status)
583 {
584 if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
585 else SetLastError( RtlNtStatusToDosError(status) );
586 }
587 return !status;
588 }
589
590
591 /***********************************************************************
592 * IsBadReadPtr (KERNEL32.@)
593 *
594 * Check for read access on a memory block.
595 *
596 * ptr [I] Address of memory block.
597 * size [I] Size of block.
598 *
599 * RETURNS
600 * Success: TRUE.
601 * Failure: FALSE. Process has read access to entire block.
602 */
603 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
604 {
605 if (!size) return FALSE; /* handle 0 size case w/o reference */
606 if (!ptr) return TRUE;
607
608 if (!page_size) page_size = getpagesize();
609 __TRY
610 {
611 volatile const char *p = ptr;
612 char dummy;
613 UINT count = size;
614
615 while (count > page_size)
616 {
617 dummy = *p;
618 p += page_size;
619 count -= page_size;
620 }
621 dummy = p[0];
622 dummy = p[count - 1];
623 }
624 __EXCEPT_PAGE_FAULT
625 {
626 TRACE_(seh)("%p caused page fault during read\n", ptr);
627 return TRUE;
628 }
629 __ENDTRY
630 return FALSE;
631 }
632
633
634 /***********************************************************************
635 * IsBadWritePtr (KERNEL32.@)
636 *
637 * Check for write access on a memory block.
638 *
639 * PARAMS
640 * ptr [I] Address of memory block.
641 * size [I] Size of block in bytes.
642 *
643 * RETURNS
644 * Success: TRUE.
645 * Failure: FALSE. Process has write access to entire block.
646 */
647 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
648 {
649 if (!size) return FALSE; /* handle 0 size case w/o reference */
650 if (!ptr) return TRUE;
651
652 if (!page_size) page_size = getpagesize();
653 __TRY
654 {
655 volatile char *p = ptr;
656 UINT count = size;
657
658 while (count > page_size)
659 {
660 *p |= 0;
661 p += page_size;
662 count -= page_size;
663 }
664 p[0] |= 0;
665 p[count - 1] |= 0;
666 }
667 __EXCEPT_PAGE_FAULT
668 {
669 TRACE_(seh)("%p caused page fault during write\n", ptr);
670 return TRUE;
671 }
672 __ENDTRY
673 return FALSE;
674 }
675
676
677 /***********************************************************************
678 * IsBadHugeReadPtr (KERNEL32.@)
679 *
680 * Check for read access on a memory block.
681 *
682 * PARAMS
683 * ptr [I] Address of memory block.
684 * size [I] Size of block.
685 *
686 * RETURNS
687 * Success: TRUE.
688 * Failure: FALSE. Process has read access to entire block.
689 */
690 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
691 {
692 return IsBadReadPtr( ptr, size );
693 }
694
695
696 /***********************************************************************
697 * IsBadHugeWritePtr (KERNEL32.@)
698 *
699 * Check for write access on a memory block.
700 *
701 * PARAMS
702 * ptr [I] Address of memory block.
703 * size [I] Size of block.
704 *
705 * RETURNS
706 * Success: TRUE.
707 * Failure: FALSE. Process has write access to entire block.
708 */
709 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
710 {
711 return IsBadWritePtr( ptr, size );
712 }
713
714
715 /***********************************************************************
716 * IsBadCodePtr (KERNEL32.@)
717 *
718 * Check for read access on a memory address.
719 *
720 * PARAMS
721 * ptr [I] Address of function.
722 *
723 * RETURNS
724 * Success: TRUE.
725 * Failure: FALSE. Process has read access to specified memory.
726 */
727 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
728 {
729 return IsBadReadPtr( ptr, 1 );
730 }
731
732
733 /***********************************************************************
734 * IsBadStringPtrA (KERNEL32.@)
735 *
736 * Check for read access on a range of memory pointed to by a string pointer.
737 *
738 * PARAMS
739 * str [I] Address of string.
740 * max [I] Maximum size of string.
741 *
742 * RETURNS
743 * Success: TRUE.
744 * Failure: FALSE. Read access to all bytes in string.
745 */
746 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
747 {
748 if (!str) return TRUE;
749
750 __TRY
751 {
752 volatile const char *p = str;
753 while (p != str + max) if (!*p++) break;
754 }
755 __EXCEPT_PAGE_FAULT
756 {
757 TRACE_(seh)("%p caused page fault during read\n", str);
758 return TRUE;
759 }
760 __ENDTRY
761 return FALSE;
762 }
763
764
765 /***********************************************************************
766 * IsBadStringPtrW (KERNEL32.@)
767 *
768 * See IsBadStringPtrA.
769 */
770 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
771 {
772 if (!str) return TRUE;
773
774 __TRY
775 {
776 volatile const WCHAR *p = str;
777 while (p != str + max) if (!*p++) break;
778 }
779 __EXCEPT_PAGE_FAULT
780 {
781 TRACE_(seh)("%p caused page fault during read\n", str);
782 return TRUE;
783 }
784 __ENDTRY
785 return FALSE;
786 }
787
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