memory/registry.c

   1 /*
   2  * Registry management
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * Based on misc/registry.c code
   7  * Copyright (C) 1996 Marcus Meissner
   8  * Copyright (C) 1998 Matthew Becker
   9  * Copyright (C) 1999 Sylvain St-Germain
  10  *
  11  * This file is concerned about handle management and interaction with the Wine server.
  12  * Registry file I/O is in misc/registry.c.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <unistd.h>
  18
  19 #include "winbase.h"
  20 #include "winreg.h"
  21 #include "winerror.h"
  22 #include "wine/winbase16.h"
  23 #include "wine/unicode.h"
  24 #include "heap.h"
  25 #include "server.h"
  26 #include "debugtools.h"
  27
  28 DEFAULT_DEBUG_CHANNEL(reg);
  29
  30
  31 /* check if value type needs string conversion (Ansi<->Unicode) */
  32 static inline int is_string( DWORD type )
  33 {
  34     return (type == REG_SZ) || (type == REG_EXPAND_SZ) || (type == REG_MULTI_SZ);
  35 }
  36
  37
  38 /******************************************************************************
  39  *           RegCreateKeyExA   [ADVAPI32.@]
  40  */
  41 DWORD WINAPI RegCreateKeyExA( HKEY hkey, LPCSTR name, DWORD reserved, LPSTR class,
  42                               DWORD options, REGSAM access, SECURITY_ATTRIBUTES *sa,
  43                               LPHKEY retkey, LPDWORD dispos )
  44 {
  45     OBJECT_ATTRIBUTES attr;
  46     UNICODE_STRING nameW, classW;
  47     ANSI_STRING nameA, classA;
  48     NTSTATUS status;
  49
  50     if (reserved) return ERROR_INVALID_PARAMETER;
  51     if (!(access & KEY_ALL_ACCESS) || (access & ~KEY_ALL_ACCESS)) return ERROR_ACCESS_DENIED;
  52
  53     attr.Length = sizeof(attr);
  54     attr.RootDirectory = hkey;
  55     attr.ObjectName = &nameW;
  56     attr.Attributes = 0;
  57     attr.SecurityDescriptor = NULL;
  58     attr.SecurityQualityOfService = NULL;
  59     RtlInitAnsiString( &nameA, name );
  60     RtlInitAnsiString( &classA, class );
  61
  62     /* FIXME: should use Unicode buffer in TEB */
  63     if (!(status = RtlAnsiStringToUnicodeString( &nameW, &nameA, TRUE )))
  64     {
  65         if (!(status = RtlAnsiStringToUnicodeString( &classW, &classA, TRUE )))
  66         {
  67             status = NtCreateKey( retkey, access, &attr, 0, &classW, options, dispos );
  68             RtlFreeUnicodeString( &classW );
  69         }
  70         RtlFreeUnicodeString( &nameW );
  71     }
  72     return RtlNtStatusToDosError( status );
  73 }
  74
  75
  76 /******************************************************************************
  77  *           RegCreateKeyA   [ADVAPI32.@]
  78  */
  79 DWORD WINAPI RegCreateKeyA( HKEY hkey, LPCSTR name, LPHKEY retkey )
  80 {
  81     return RegCreateKeyExA( hkey, name, 0, NULL, REG_OPTION_NON_VOLATILE,
  82                             KEY_ALL_ACCESS, NULL, retkey, NULL );
  83 }
  84
  85
  86
  87 /******************************************************************************
  88  *           RegOpenKeyExA   [ADVAPI32.@]
  89  */
  90 DWORD WINAPI RegOpenKeyExA( HKEY hkey, LPCSTR name, DWORD reserved, REGSAM access, LPHKEY retkey )
  91 {
  92     OBJECT_ATTRIBUTES attr;
  93     UNICODE_STRING nameW;
  94     STRING nameA;
  95     NTSTATUS status;
  96
  97     attr.Length = sizeof(attr);
  98     attr.RootDirectory = hkey;
  99     attr.ObjectName = &nameW;
 100     attr.Attributes = 0;
 101     attr.SecurityDescriptor = NULL;
 102     attr.SecurityQualityOfService = NULL;
 103
 104     RtlInitAnsiString( &nameA, name );
 105     /* FIXME: should use Unicode buffer in TEB */
 106     if (!(status = RtlAnsiStringToUnicodeString( &nameW, &nameA, TRUE )))
 107     {
 108         status = NtOpenKey( retkey, access, &attr );
 109         RtlFreeUnicodeString( &nameW );
 110     }
 111     return RtlNtStatusToDosError( status );
 112 }
 113
 114
 115 /******************************************************************************
 116  *           RegOpenKeyA   [ADVAPI32.@]
 117  */
 118 DWORD WINAPI RegOpenKeyA( HKEY hkey, LPCSTR name, LPHKEY retkey )
 119 {
 120     return RegOpenKeyExA( hkey, name, 0, KEY_ALL_ACCESS, retkey );
 121 }
 122
 123
 124 /******************************************************************************
 125  *           RegEnumKeyExA   [ADVAPI32.@]
 126  */
 127 DWORD WINAPI RegEnumKeyExA( HKEY hkey, DWORD index, LPSTR name, LPDWORD name_len,
 128                             LPDWORD reserved, LPSTR class, LPDWORD class_len, FILETIME *ft )
 129 {
 130     NTSTATUS status;
 131     char buffer[256], *buf_ptr = buffer;
 132     KEY_NODE_INFORMATION *info = (KEY_NODE_INFORMATION *)buffer;
 133     DWORD total_size;
 134
 135     TRACE( "(0x%x,%ld,%p,%p(%ld),%p,%p,%p,%p)\n", hkey, index, name, name_len,
 136            name_len ? *name_len : -1, reserved, class, class_len, ft );
 137
 138     if (reserved) return ERROR_INVALID_PARAMETER;
 139
 140     status = NtEnumerateKey( hkey, index, KeyNodeInformation,
 141                              buffer, sizeof(buffer), &total_size );
 142
 143     while (status == STATUS_BUFFER_OVERFLOW)
 144     {
 145         /* retry with a dynamically allocated buffer */
 146         if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 147         if (!(buf_ptr = HeapAlloc( GetProcessHeap(), 0, total_size )))
 148             return ERROR_NOT_ENOUGH_MEMORY;
 149         info = (KEY_NODE_INFORMATION *)buf_ptr;
 150         status = NtEnumerateKey( hkey, index, KeyNodeInformation,
 151                                  buf_ptr, total_size, &total_size );
 152     }
 153
 154     if (!status)
 155     {
 156         DWORD len = WideCharToMultiByte( CP_ACP, 0, info->Name, info->NameLength/sizeof(WCHAR),
 157                                          NULL, 0, NULL, NULL );
 158         DWORD cls_len = WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info->ClassOffset),
 159                                              info->ClassLength / sizeof(WCHAR),
 160                                              NULL, 0, NULL, NULL );
 161
 162         if (ft) *ft = info->LastWriteTime;
 163
 164         if (len >= *name_len || (class_len && (cls_len >= *class_len)))
 165             status = STATUS_BUFFER_OVERFLOW;
 166         else
 167         {
 168             *name_len = len;
 169             WideCharToMultiByte( CP_ACP, 0, info->Name, info->NameLength/sizeof(WCHAR),
 170                                  name, len, NULL, NULL );
 171             name[len] = 0;
 172             if (class_len)
 173             {
 174                 *class_len = cls_len;
 175                 if (class)
 176                 {
 177                     WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info->ClassOffset),
 178                                          info->ClassLength / sizeof(WCHAR),
 179                                          class, cls_len, NULL, NULL );
 180                     class[cls_len] = 0;
 181                 }
 182             }
 183         }
 184     }
 185
 186     if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 187     return RtlNtStatusToDosError( status );
 188 }
 189
 190
 191 /******************************************************************************
 192  *           RegEnumKeyA   [ADVAPI32.@]
 193  */
 194 DWORD WINAPI RegEnumKeyA( HKEY hkey, DWORD index, LPSTR name, DWORD name_len )
 195 {
 196     return RegEnumKeyExA( hkey, index, name, &name_len, NULL, NULL, NULL, NULL );
 197 }
 198
 199
 200 /******************************************************************************
 201  *           RegQueryInfoKeyA   [ADVAPI32.@]
 202  */
 203 DWORD WINAPI RegQueryInfoKeyA( HKEY hkey, LPSTR class, LPDWORD class_len, LPDWORD reserved,
 204                                LPDWORD subkeys, LPDWORD max_subkey, LPDWORD max_class,
 205                                LPDWORD values, LPDWORD max_value, LPDWORD max_data,
 206                                LPDWORD security, FILETIME *modif )
 207 {
 208     NTSTATUS status;
 209     char buffer[256], *buf_ptr = buffer;
 210     KEY_FULL_INFORMATION *info = (KEY_FULL_INFORMATION *)buffer;
 211     DWORD total_size;
 212
 213     TRACE( "(0x%x,%p,%ld,%p,%p,%p,%p,%p,%p,%p,%p)\n", hkey, class, class_len ? *class_len : 0,
 214            reserved, subkeys, max_subkey, values, max_value, max_data, security, modif );
 215
 216     if (class && !class_len && !(GetVersion() & 0x80000000 /*NT*/))
 217         return ERROR_INVALID_PARAMETER;
 218
 219     status = NtQueryKey( hkey, KeyFullInformation, buffer, sizeof(buffer), &total_size );
 220
 221     if (class || class_len)
 222     {
 223         /* retry with a dynamically allocated buffer */
 224         while (status == STATUS_BUFFER_OVERFLOW)
 225         {
 226             if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 227             if (!(buf_ptr = HeapAlloc( GetProcessHeap(), 0, total_size )))
 228                 return ERROR_NOT_ENOUGH_MEMORY;
 229             info = (KEY_FULL_INFORMATION *)buf_ptr;
 230             status = NtQueryKey( hkey, KeyFullInformation, buf_ptr, total_size, &total_size );
 231         }
 232
 233         if (!status)
 234         {
 235             DWORD len = WideCharToMultiByte( CP_ACP, 0,
 236                                              (WCHAR *)(buf_ptr + info->ClassOffset),
 237                                              info->ClassLength/sizeof(WCHAR),
 238                                              NULL, 0, NULL, NULL );
 239             if (class_len)
 240             {
 241                 if (len + 1 > *class_len) status = STATUS_BUFFER_OVERFLOW;
 242                 *class_len = len;
 243             }
 244             if (class && !status)
 245             {
 246                 WideCharToMultiByte( CP_ACP, 0,
 247                                      (WCHAR *)(buf_ptr + info->ClassOffset),
 248                                      info->ClassLength/sizeof(WCHAR),
 249                                      class, len, NULL, NULL );
 250                 class[len] = 0;
 251             }
 252         }
 253     }
 254
 255     if (!status || status == STATUS_BUFFER_OVERFLOW)
 256     {
 257         if (subkeys) *subkeys = info->SubKeys;
 258         if (max_subkey) *max_subkey = info->MaxNameLen;
 259         if (max_class) *max_class = info->MaxClassLen;
 260         if (values) *values = info->Values;
 261         if (max_value) *max_value = info->MaxValueNameLen;
 262         if (max_data) *max_data = info->MaxValueDataLen;
 263         if (modif) *modif = info->LastWriteTime;
 264     }
 265
 266     if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 267     return RtlNtStatusToDosError( status );
 268 }
 269
 270
 271 /******************************************************************************
 272  *           RegCloseKey   [ADVAPI32.@]
 273  *
 274  * Releases the handle of the specified key
 275  *
 276  * PARAMS
 277  *    hkey [I] Handle of key to close
 278  *
 279  * RETURNS
 280  *    Success: ERROR_SUCCESS
 281  *    Failure: Error code
 282  */
 283 DWORD WINAPI RegCloseKey( HKEY hkey )
 284 {
 285     if (!hkey || hkey >= 0x80000000) return ERROR_SUCCESS;
 286     return RtlNtStatusToDosError( NtClose( hkey ) );
 287 }
 288
 289
 290 /******************************************************************************
 291  *           RegDeleteKeyA   [ADVAPI32.@]
 292  */
 293 DWORD WINAPI RegDeleteKeyA( HKEY hkey, LPCSTR name )
 294 {
 295     DWORD ret;
 296     HKEY tmp;
 297
 298     if (!name || !*name) return NtDeleteKey( hkey );
 299     if (!(ret = RegOpenKeyExA( hkey, name, 0, 0, &tmp )))
 300     {
 301         ret = RtlNtStatusToDosError( NtDeleteKey( tmp ) );
 302         RegCloseKey( tmp );
 303     }
 304     return ret;
 305 }
 306
 307
 308
 309 /******************************************************************************
 310  *           RegSetValueExA   [ADVAPI32.@]
 311  */
 312 DWORD WINAPI RegSetValueExA( HKEY hkey, LPCSTR name, DWORD reserved, DWORD type,
 313                              CONST BYTE *data, DWORD count )
 314 {
 315     UNICODE_STRING nameW;
 316     ANSI_STRING nameA;
 317     WCHAR *dataW = NULL;
 318     NTSTATUS status;
 319
 320     if (count && is_string(type))
 321     {
 322         /* if user forgot to count terminating null, add it (yes NT does this) */
 323         if (data[count-1] && !data[count]) count++;
 324     }
 325
 326     if (is_string( type )) /* need to convert to Unicode */
 327     {
 328         DWORD lenW = MultiByteToWideChar( CP_ACP, 0, data, count, NULL, 0 );
 329         if (!(dataW = HeapAlloc( GetProcessHeap(), 0, lenW*sizeof(WCHAR) )))
 330             return ERROR_OUTOFMEMORY;
 331         MultiByteToWideChar( CP_ACP, 0, data, count, dataW, lenW );
 332         count = lenW * sizeof(WCHAR);
 333         data = (BYTE *)dataW;
 334     }
 335
 336     RtlInitAnsiString( &nameA, name );
 337     /* FIXME: should use Unicode buffer in TEB */
 338     if (!(status = RtlAnsiStringToUnicodeString( &nameW, &nameA, TRUE )))
 339     {
 340         status = NtSetValueKey( hkey, &nameW, 0, type, data, count );
 341         RtlFreeUnicodeString( &nameW );
 342     }
 343     if (dataW) HeapFree( GetProcessHeap(), 0, dataW );
 344     return RtlNtStatusToDosError( status );
 345 }
 346
 347
 348 /******************************************************************************
 349  *           RegSetValueA   [ADVAPI32.@]
 350  */
 351 DWORD WINAPI RegSetValueA( HKEY hkey, LPCSTR name, DWORD type, LPCSTR data, DWORD count )
 352 {
 353     HKEY subkey = hkey;
 354     DWORD ret;
 355
 356     TRACE("(0x%x,%s,%ld,%s,%ld)\n", hkey, debugstr_a(name), type, debugstr_a(data), count );
 357
 358     if (type != REG_SZ) return ERROR_INVALID_PARAMETER;
 359
 360     if (name && name[0])  /* need to create the subkey */
 361     {
 362         if ((ret = RegCreateKeyA( hkey, name, &subkey )) != ERROR_SUCCESS) return ret;
 363     }
 364     ret = RegSetValueExA( subkey, NULL, 0, REG_SZ, (LPBYTE)data, strlen(data)+1 );
 365     if (subkey != hkey) RegCloseKey( subkey );
 366     return ret;
 367 }
 368
 369
 370
 371 /******************************************************************************
 372  *           RegQueryValueExA   [ADVAPI32.@]
 373  *
 374  * NOTES:
 375  * the documentation is wrong: if the buffer is too small it remains untouched
 376  */
 377 DWORD WINAPI RegQueryValueExA( HKEY hkey, LPCSTR name, LPDWORD reserved, LPDWORD type,
 378                                LPBYTE data, LPDWORD count )
 379 {
 380     NTSTATUS status;
 381     ANSI_STRING nameA;
 382     UNICODE_STRING nameW;
 383     DWORD total_size;
 384     char buffer[256], *buf_ptr = buffer;
 385     KEY_VALUE_PARTIAL_INFORMATION *info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
 386     static const int info_size = sizeof(*info) - sizeof(info->Data);
 387
 388     TRACE("(0x%x,%s,%p,%p,%p,%p=%ld)\n",
 389           hkey, debugstr_a(name), reserved, type, data, count, count ? *count : 0 );
 390
 391     if ((data && !count) || reserved) return ERROR_INVALID_PARAMETER;
 392
 393     RtlInitAnsiString( &nameA, name );
 394     /* FIXME: should use Unicode buffer in TEB */
 395     if ((status = RtlAnsiStringToUnicodeString( &nameW, &nameA, TRUE )))
 396         return RtlNtStatusToDosError(status);
 397
 398     status = NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation,
 399                               buffer, sizeof(buffer), &total_size );
 400     if (status && status != STATUS_BUFFER_OVERFLOW) goto done;
 401
 402     /* we need to fetch the contents for a string type even if not requested,
 403      * because we need to compute the length of the ASCII string. */
 404     if (data || is_string(info->Type))
 405     {
 406         /* retry with a dynamically allocated buffer */
 407         while (status == STATUS_BUFFER_OVERFLOW)
 408         {
 409             if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 410             if (!(buf_ptr = HeapAlloc( GetProcessHeap(), 0, total_size )))
 411             {
 412                 status = STATUS_NO_MEMORY;
 413                 goto done;
 414             }
 415             info = (KEY_VALUE_PARTIAL_INFORMATION *)buf_ptr;
 416             status = NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation,
 417                                       buf_ptr, total_size, &total_size );
 418         }
 419
 420         if (!status)
 421         {
 422             if (is_string(info->Type))
 423             {
 424                 DWORD len = WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info_size),
 425                                                  (total_size - info_size) /sizeof(WCHAR),
 426                                                  NULL, 0, NULL, NULL );
 427                 if (data && len)
 428                 {
 429                     if (len > *count) status = STATUS_BUFFER_OVERFLOW;
 430                     else
 431                     {
 432                         WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info_size),
 433                                              (total_size - info_size) /sizeof(WCHAR),
 434                                              data, len, NULL, NULL );
 435                         /* if the type is REG_SZ and data is not 0-terminated
 436                          * and there is enough space in the buffer NT appends a \0 */
 437                         if (len < *count && data[len-1]) data[len] = 0;
 438                     }
 439                 }
 440                 total_size = len + info_size;
 441             }
 442             else if (data)
 443             {
 444                 if (total_size - info_size > *count) status = STATUS_BUFFER_OVERFLOW;
 445                 else memcpy( data, buf_ptr + info_size, total_size - info_size );
 446             }
 447         }
 448         else if (status != STATUS_BUFFER_OVERFLOW) goto done;
 449     }
 450
 451     if (type) *type = info->Type;
 452     if (count) *count = total_size - info_size;
 453
 454  done:
 455     if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 456     RtlFreeUnicodeString( &nameW );
 457     return RtlNtStatusToDosError(status);
 458 }
 459
 460
 461 /******************************************************************************
 462  *           RegQueryValueA   [ADVAPI32.@]
 463  */
 464 DWORD WINAPI RegQueryValueA( HKEY hkey, LPCSTR name, LPSTR data, LPLONG count )
 465 {
 466     DWORD ret;
 467     HKEY subkey = hkey;
 468
 469     TRACE("(%x,%s,%p,%ld)\n", hkey, debugstr_a(name), data, count ? *count : 0 );
 470
 471     if (name && name[0])
 472     {
 473         if ((ret = RegOpenKeyA( hkey, name, &subkey )) != ERROR_SUCCESS) return ret;
 474     }
 475     ret = RegQueryValueExA( subkey, NULL, NULL, NULL, (LPBYTE)data, count );
 476     if (subkey != hkey) RegCloseKey( subkey );
 477     if (ret == ERROR_FILE_NOT_FOUND)
 478     {
 479         /* return empty string if default value not found */
 480         if (data) *data = 0;
 481         if (count) *count = 1;
 482         ret = ERROR_SUCCESS;
 483     }
 484     return ret;
 485 }
 486
 487
 488 /******************************************************************************
 489  *           RegEnumValueA   [ADVAPI32.@]
 490  */
 491 DWORD WINAPI RegEnumValueA( HKEY hkey, DWORD index, LPSTR value, LPDWORD val_count,
 492                             LPDWORD reserved, LPDWORD type, LPBYTE data, LPDWORD count )
 493 {
 494     NTSTATUS status;
 495     DWORD total_size;
 496     char buffer[256], *buf_ptr = buffer;
 497     KEY_VALUE_FULL_INFORMATION *info = (KEY_VALUE_FULL_INFORMATION *)buffer;
 498     static const int info_size = sizeof(*info) - sizeof(info->Name);
 499
 500     TRACE("(%x,%ld,%p,%p,%p,%p,%p,%p)\n",
 501           hkey, index, value, val_count, reserved, type, data, count );
 502
 503     /* NT only checks count, not val_count */
 504     if ((data && !count) || reserved) return ERROR_INVALID_PARAMETER;
 505
 506     total_size = info_size + (MAX_PATH + 1) * sizeof(WCHAR);
 507     if (data) total_size += *count;
 508     total_size = min( sizeof(buffer), total_size );
 509
 510     status = NtEnumerateValueKey( hkey, index, KeyValueFullInformation,
 511                                   buffer, total_size, &total_size );
 512     if (status && status != STATUS_BUFFER_OVERFLOW) goto done;
 513
 514     /* we need to fetch the contents for a string type even if not requested,
 515      * because we need to compute the length of the ASCII string. */
 516     if (value || data || is_string(info->Type))
 517     {
 518         /* retry with a dynamically allocated buffer */
 519         while (status == STATUS_BUFFER_OVERFLOW)
 520         {
 521             if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 522             if (!(buf_ptr = HeapAlloc( GetProcessHeap(), 0, total_size )))
 523                 return ERROR_NOT_ENOUGH_MEMORY;
 524             info = (KEY_VALUE_FULL_INFORMATION *)buf_ptr;
 525             status = NtEnumerateValueKey( hkey, index, KeyValueFullInformation,
 526                                           buf_ptr, total_size, &total_size );
 527         }
 528
 529         if (status) goto done;
 530
 531         if (value)
 532         {
 533             DWORD len = WideCharToMultiByte( CP_ACP, 0, info->Name, info->NameLength/sizeof(WCHAR),
 534                                              NULL, 0, NULL, NULL );
 535             if (len >= *val_count)
 536             {
 537                 status = STATUS_BUFFER_OVERFLOW;
 538                 goto done;
 539             }
 540             WideCharToMultiByte( CP_ACP, 0, info->Name, info->NameLength/sizeof(WCHAR),
 541                                  value, len, NULL, NULL );
 542             value[len] = 0;
 543             *val_count = len;
 544         }
 545
 546         if (is_string(info->Type))
 547         {
 548             DWORD len = WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info->DataOffset),
 549                                              (total_size - info->DataOffset) / sizeof(WCHAR),
 550                                              NULL, 0, NULL, NULL );
 551             if (data && len)
 552             {
 553                 if (len > *count)
 554                 {
 555                     status = STATUS_BUFFER_OVERFLOW;
 556                     goto done;
 557                 }
 558                 WideCharToMultiByte( CP_ACP, 0, (WCHAR *)(buf_ptr + info->DataOffset),
 559                                      (total_size - info->DataOffset) / sizeof(WCHAR),
 560                                      data, len, NULL, NULL );
 561                 /* if the type is REG_SZ and data is not 0-terminated
 562                  * and there is enough space in the buffer NT appends a \0 */
 563                 if (len < *count && data[len-1]) data[len] = 0;
 564             }
 565             info->DataLength = len;
 566         }
 567         else if (data)
 568         {
 569             if (total_size - info->DataOffset > *count) status = STATUS_BUFFER_OVERFLOW;
 570             else memcpy( data, buf_ptr + info->DataOffset, total_size - info->DataOffset );
 571         }
 572     }
 573
 574     if (type) *type = info->Type;
 575     if (count) *count = info->DataLength;
 576
 577  done:
 578     if (buf_ptr != buffer) HeapFree( GetProcessHeap(), 0, buf_ptr );
 579     return RtlNtStatusToDosError(status);
 580 }
 581
 582
 583
 584 /******************************************************************************
 585  *           RegDeleteValueA   [ADVAPI32.@]
 586  */
 587 DWORD WINAPI RegDeleteValueA( HKEY hkey, LPCSTR name )
 588 {
 589     UNICODE_STRING nameW;
 590     STRING nameA;
 591     NTSTATUS status;
 592
 593     RtlInitAnsiString( &nameA, name );
 594     /* FIXME: should use Unicode buffer in TEB */
 595     if (!(status = RtlAnsiStringToUnicodeString( &nameW, &nameA, TRUE )))
 596     {
 597         status = NtDeleteValueKey( hkey, &nameW );
 598         RtlFreeUnicodeString( &nameW );
 599     }
 600     return RtlNtStatusToDosError( status );
 601 }
 602
 603
 604 /******************************************************************************
 605  *           RegLoadKeyA   [ADVAPI32.@]
 606  */
 607 LONG WINAPI RegLoadKeyA( HKEY hkey, LPCSTR subkey, LPCSTR filename )
 608 {
 609     HANDLE file;
 610     DWORD ret, len, err = GetLastError();
 611
 612     TRACE( "(%x,%s,%s)\n", hkey, debugstr_a(subkey), debugstr_a(filename) );
 613
 614     if (!filename || !*filename) return ERROR_INVALID_PARAMETER;
 615     if (!subkey || !*subkey) return ERROR_INVALID_PARAMETER;
 616
 617     len = MultiByteToWideChar( CP_ACP, 0, subkey, strlen(subkey), NULL, 0 ) * sizeof(WCHAR);
 618     if (len > MAX_PATH*sizeof(WCHAR)) return ERROR_INVALID_PARAMETER;
 619
 620     if ((file = CreateFileA( filename, GENERIC_READ, 0, NULL, OPEN_EXISTING,
 621                              FILE_ATTRIBUTE_NORMAL, 0 )) == INVALID_HANDLE_VALUE)
 622     {
 623         ret = GetLastError();
 624         goto done;
 625     }
 626
 627     SERVER_START_VAR_REQ( load_registry, len )
 628     {
 629         req->hkey  = hkey;
 630         req->file  = file;
 631         MultiByteToWideChar( CP_ACP, 0, subkey, strlen(subkey),
 632                              server_data_ptr(req), len/sizeof(WCHAR) );
 633         ret = RtlNtStatusToDosError( SERVER_CALL() );
 634     }
 635     SERVER_END_VAR_REQ;
 636     CloseHandle( file );
 637
 638  done:
 639     SetLastError( err );  /* restore the last error code */
 640     return ret;
 641 }
 642
 643
 644 /******************************************************************************
 645  *           RegSaveKeyA   [ADVAPI32.@]
 646  *
 647  * PARAMS
 648  *    hkey   [I] Handle of key where save begins
 649  *    lpFile [I] Address of filename to save to
 650  *    sa     [I] Address of security structure
 651  */
 652 LONG WINAPI RegSaveKeyA( HKEY hkey, LPCSTR file, LPSECURITY_ATTRIBUTES sa )
 653 {
 654     char buffer[1024];
 655     int count = 0;
 656     LPSTR name;
 657     DWORD ret, err;
 658     HANDLE handle;
 659
 660     TRACE( "(%x,%s,%p)\n", hkey, debugstr_a(file), sa );
 661
 662     if (!file || !*file) return ERROR_INVALID_PARAMETER;
 663
 664     err = GetLastError();
 665     GetFullPathNameA( file, sizeof(buffer), buffer, &name );
 666     for (;;)
 667     {
 668         sprintf( name, "reg%04x.tmp", count++ );
 669         handle = CreateFileA( buffer, GENERIC_WRITE, 0, NULL,
 670                             CREATE_NEW, FILE_ATTRIBUTE_NORMAL, 0 );
 671         if (handle != INVALID_HANDLE_VALUE) break;
 672         if ((ret = GetLastError()) != ERROR_ALREADY_EXISTS) goto done;
 673
 674         /* Something gone haywire ? Please report if this happens abnormally */
 675         if (count >= 100)
 676             MESSAGE("Wow, we are already fiddling with a temp file %s with an ordinal as high as %d !\nYou might want to delete all corresponding temp files in that directory.\n", buffer, count);
 677     }
 678
 679     SERVER_START_REQ( save_registry )
 680     {
 681         req->hkey = hkey;
 682         req->file = handle;
 683         ret = RtlNtStatusToDosError( SERVER_CALL() );
 684     }
 685     SERVER_END_REQ;
 686
 687     CloseHandle( handle );
 688     if (!ret)
 689     {
 690         if (!MoveFileExA( buffer, file, MOVEFILE_REPLACE_EXISTING ))
 691         {
 692             ERR( "Failed to move %s to %s\n", buffer, file );
 693             ret = GetLastError();
 694         }
 695     }
 696     if (ret) DeleteFileA( buffer );
 697
 698 done:
 699     SetLastError( err );  /* restore last error code */
 700     return ret;
 701 }