dlls/kernel32/format_msg.c

   1 /*
   2  * FormatMessage implementation
   3  *
   4  * Copyright 1996 Marcus Meissner
   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
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "ntstatus.h"
  28 #define WIN32_NO_STATUS
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winerror.h"
  32 #include "winternl.h"
  33 #include "winuser.h"
  34 #include "winnls.h"
  35 #include "wine/unicode.h"
  36 #include "kernel_private.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(resource);
  40
  41
  42 /* Messages used by FormatMessage
  43  *
  44  * They can be specified either directly or using a message ID and
  45  * loading them from the resource.
  46  *
  47  * The resourcedata has following format:
  48  * start:
  49  * 0: DWORD nrofentries
  50  * nrofentries * subentry:
  51  *      0: DWORD firstentry
  52  *      4: DWORD lastentry
  53  *      8: DWORD offset from start to the stringentries
  54  *
  55  * (lastentry-firstentry) * stringentry:
  56  * 0: WORD len (0 marks end)    [ includes the 4 byte header length ]
  57  * 2: WORD flags
  58  * 4: CHAR[len-4]
  59  *      (stringentry i of a subentry refers to the ID 'firstentry+i')
  60  *
  61  * Yes, ANSI strings in win32 resources. Go figure.
  62  */
  63
  64 static const WCHAR PCNTFMTWSTR[] = { '%','%','%','s',0 };
  65 static const WCHAR FMTWSTR[] = { '%','s',0 };
  66
  67 /**********************************************************************
  68  *      load_messageW           (internal)
  69  */
  70 static LPWSTR load_messageW( HMODULE module, UINT id, WORD lang )
  71 {
  72     const MESSAGE_RESOURCE_ENTRY *mre;
  73     WCHAR *buffer;
  74
  75     TRACE("module = %p, id = %08x\n", module, id );
  76
  77     if (!module) module = GetModuleHandleW( NULL );
  78     if (RtlFindMessage( module, RT_MESSAGETABLE, lang, id, &mre ) != STATUS_SUCCESS) return NULL;
  79
  80     if (mre->Flags & MESSAGE_RESOURCE_UNICODE)
  81     {
  82         int len = (strlenW( (const WCHAR *)mre->Text ) + 1) * sizeof(WCHAR);
  83         if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len ))) return NULL;
  84         memcpy( buffer, mre->Text, len );
  85     }
  86     else
  87     {
  88         int len = MultiByteToWideChar( CP_ACP, 0, (const char *)mre->Text, -1, NULL, 0 );
  89         if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) ))) return NULL;
  90         MultiByteToWideChar( CP_ACP, 0, (const char*)mre->Text, -1, buffer, len );
  91     }
  92     TRACE("returning %s\n", wine_dbgstr_w(buffer));
  93     return buffer;
  94 }
  95
  96
  97 /**********************************************************************
  98  *      load_messageA           (internal)
  99  */
 100 static LPSTR load_messageA( HMODULE module, UINT id, WORD lang )
 101 {
 102     const MESSAGE_RESOURCE_ENTRY *mre;
 103     char *buffer;
 104
 105     TRACE("module = %p, id = %08x\n", module, id );
 106
 107     if (!module) module = GetModuleHandleW( NULL );
 108     if (RtlFindMessage( module, RT_MESSAGETABLE, lang, id, &mre ) != STATUS_SUCCESS) return NULL;
 109
 110     if (mre->Flags & MESSAGE_RESOURCE_UNICODE)
 111     {
 112         int len = WideCharToMultiByte( CP_ACP, 0, (const WCHAR *)mre->Text, -1, NULL, 0, NULL, NULL );
 113         if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len ))) return NULL;
 114         WideCharToMultiByte( CP_ACP, 0, (const WCHAR *)mre->Text, -1, buffer, len, NULL, NULL );
 115     }
 116     else
 117     {
 118         int len = strlen((const char*)mre->Text) + 1;
 119         if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len ))) return NULL;
 120         memcpy( buffer, mre->Text, len );
 121     }
 122     TRACE("returning %s\n", wine_dbgstr_a(buffer));
 123     return buffer;
 124 }
 125
 126
 127 /***********************************************************************
 128  *           FormatMessageA   (KERNEL32.@)
 129  * FIXME: missing wrap,
 130  */
 131 DWORD WINAPI FormatMessageA(
 132         DWORD   dwFlags,
 133         LPCVOID lpSource,
 134         DWORD   dwMessageId,
 135         DWORD   dwLanguageId,
 136         LPSTR   lpBuffer,
 137         DWORD   nSize,
 138         va_list* _args )
 139 {
 140     LPDWORD args=(LPDWORD)_args;
 141     DWORD ret = 0;
 142 #if defined(__i386__) || defined(__sparc__)
 143 /* This implementation is completely dependent on the format of the va_list on x86 CPUs */
 144     LPSTR       target,t;
 145     DWORD       talloced;
 146     LPSTR       from,f;
 147     DWORD       width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
 148     BOOL    eos = FALSE;
 149     CHAR        ch;
 150
 151     TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
 152           dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
 153     if ((dwFlags & FORMAT_MESSAGE_FROM_STRING)
 154         &&((dwFlags & FORMAT_MESSAGE_FROM_SYSTEM)
 155            || (dwFlags & FORMAT_MESSAGE_FROM_HMODULE))) return 0;
 156
 157     if (!lpBuffer)
 158     {
 159         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 160         return 0;
 161     }
 162
 163     if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
 164         FIXME("line wrapping (%u) not supported.\n", width);
 165     from = NULL;
 166     if (dwFlags & FORMAT_MESSAGE_FROM_STRING)
 167     {
 168         from = HeapAlloc( GetProcessHeap(), 0, strlen((LPCSTR)lpSource)+1 );
 169         strcpy( from, (LPCSTR)lpSource );
 170     }
 171     else {
 172         from = NULL;
 173         if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
 174             from = load_messageA( (HMODULE)lpSource, dwMessageId, dwLanguageId );
 175         if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
 176             from = load_messageA( kernel32_handle, dwMessageId, dwLanguageId );
 177
 178         if (!from)
 179         {
 180             SetLastError (ERROR_RESOURCE_LANG_NOT_FOUND);
 181             return 0;
 182         }
 183     }
 184     target      = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 100);
 185     t   = target;
 186     talloced= 100;
 187
 188 #define ADD_TO_T(c) do { \
 189         *t++=c;\
 190         if ((DWORD)(t-target) == talloced) {\
 191             target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,talloced*2);\
 192             t = target+talloced;\
 193             talloced*=2;\
 194       }\
 195 } while (0)
 196
 197     if (from) {
 198         f=from;
 199         if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS) {
 200             while (*f && !eos)
 201                 ADD_TO_T(*f++);
 202         }
 203         else {
 204             while (*f && !eos) {
 205                 if (*f=='%') {
 206                     int insertnr;
 207                     char *fmtstr,*x,*lastf;
 208                     DWORD *argliststart;
 209
 210                     fmtstr = NULL;
 211                     lastf = f;
 212                     f++;
 213                     if (!*f) {
 214                         ADD_TO_T('%');
 215                         continue;
 216                     }
 217                     switch (*f) {
 218                     case '1':case '2':case '3':case '4':case '5':
 219                     case '6':case '7':case '8':case '9':
 220                         insertnr=*f-'0';
 221                         switch (f[1]) {
 222                         case '0':case '1':case '2':case '3':
 223                         case '4':case '5':case '6':case '7':
 224                         case '8':case '9':
 225                             f++;
 226                             insertnr=insertnr*10+*f-'0';
 227                             f++;
 228                             break;
 229                         default:
 230                             f++;
 231                             break;
 232                         }
 233                         if (*f=='!') {
 234                             f++;
 235                             if (NULL!=(x=strchr(f,'!'))) {
 236                                 *x='\0';
 237                                 fmtstr=HeapAlloc(GetProcessHeap(),0,strlen(f)+2);
 238                                 sprintf(fmtstr,"%%%s",f);
 239                                 f=x+1;
 240                             } else {
 241                                 fmtstr=HeapAlloc(GetProcessHeap(),0,strlen(f)+2);
 242                                 sprintf(fmtstr,"%%%s",f);
 243                                 f+=strlen(f); /*at \0*/
 244                             }
 245                         } else {
 246                             if(!args) break;
 247                             fmtstr = HeapAlloc(GetProcessHeap(),0,3);
 248                             strcpy( fmtstr, "%s" );
 249                         }
 250                         if (args) {
 251                             int sz;
 252                             LPSTR b;
 253
 254                             if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
 255                                 argliststart=args+insertnr-1;
 256                             else
 257                                 argliststart=(*(DWORD**)args)+insertnr-1;
 258
 259                                 /* FIXME: precision and width components are not handled correctly */
 260                             if ( (strcmp(fmtstr, "%ls") == 0) || (strcmp(fmtstr,"%S") == 0) ) {
 261                                 sz = WideCharToMultiByte( CP_ACP, 0, *(WCHAR**)argliststart, -1, NULL, 0, NULL, NULL);
 262                                 b = HeapAlloc(GetProcessHeap(), 0, sz);
 263                                 WideCharToMultiByte( CP_ACP, 0, *(WCHAR**)argliststart, -1, b, sz, NULL, NULL);
 264                             } else {
 265                                 b = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sz = 1000);
 266                                 /* CMF - This makes a BIG assumption about va_list */
 267                                 TRACE("A BIG assumption\n");
 268                                 vsnprintf(b, sz, fmtstr, (va_list) argliststart);
 269                             }
 270                             for (x=b; *x; x++) ADD_TO_T(*x);
 271
 272                             HeapFree(GetProcessHeap(),0,b);
 273                         } else {
 274                                 /* NULL args - copy formatstr
 275                                  * (probably wrong)
 276                                  */
 277                             while ((lastf<f)&&(*lastf)) {
 278                                 ADD_TO_T(*lastf++);
 279                             }
 280                         }
 281                         HeapFree(GetProcessHeap(),0,fmtstr);
 282                         break;
 283                     case 'n':
 284                         ADD_TO_T('\r');
 285                         ADD_TO_T('\n');
 286                         f++;
 287                         break;
 288                     case '0':
 289                         eos = TRUE;
 290                         f++;
 291                         break;
 292                     default:
 293                         ADD_TO_T(*f++);
 294                         break;
 295                     }
 296                 } else {
 297                     ch = *f;
 298                     f++;
 299                     if (ch == '\r') {
 300                         if (*f == '\n')
 301                             f++;
 302                         if(width)
 303                             ADD_TO_T(' ');
 304                         else
 305                         {
 306                             ADD_TO_T('\r');
 307                             ADD_TO_T('\n');
 308                         }
 309                     } else {
 310                         if (ch == '\n')
 311                         {
 312                             if(width)
 313                                 ADD_TO_T(' ');
 314                             else
 315                             {
 316                                 ADD_TO_T('\r');
 317                                 ADD_TO_T('\n');
 318                             }
 319                         }
 320                         else
 321                             ADD_TO_T(ch);
 322                     }
 323                 }
 324             }
 325         }
 326         *t='\0';
 327     }
 328     talloced = strlen(target)+1;
 329     if (nSize && talloced<nSize) {
 330         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,nSize);
 331     }
 332     TRACE("-- %s\n",debugstr_a(target));
 333     if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) {
 334         *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT,max(nSize, talloced));
 335         memcpy(*(LPSTR*)lpBuffer,target,talloced);
 336     } else {
 337         lstrcpynA(lpBuffer,target,nSize);
 338     }
 339     HeapFree(GetProcessHeap(),0,target);
 340     HeapFree(GetProcessHeap(),0,from);
 341     ret = (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ? strlen(*(LPSTR*)lpBuffer) : strlen(lpBuffer);
 342 #endif /* __i386__ */
 343     TRACE("-- returning %d\n", ret);
 344     return ret;
 345 }
 346 #undef ADD_TO_T
 347
 348
 349 /***********************************************************************
 350  *           FormatMessageW   (KERNEL32.@)
 351  */
 352 DWORD WINAPI FormatMessageW(
 353         DWORD   dwFlags,
 354         LPCVOID lpSource,
 355         DWORD   dwMessageId,
 356         DWORD   dwLanguageId,
 357         LPWSTR  lpBuffer,
 358         DWORD   nSize,
 359         va_list* _args )
 360 {
 361     LPDWORD args=(LPDWORD)_args;
 362 #if defined(__i386__) || defined(__sparc__)
 363 /* This implementation is completely dependent on the format of the va_list on x86 CPUs */
 364     LPWSTR target,t;
 365     DWORD talloced;
 366     LPWSTR from,f;
 367     DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
 368     BOOL eos = FALSE;
 369     WCHAR ch;
 370
 371     TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
 372           dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
 373     if ((dwFlags & FORMAT_MESSAGE_FROM_STRING)
 374         &&((dwFlags & FORMAT_MESSAGE_FROM_SYSTEM)
 375            || (dwFlags & FORMAT_MESSAGE_FROM_HMODULE))) return 0;
 376
 377     if (!lpBuffer)
 378     {
 379         SetLastError(ERROR_INVALID_PARAMETER);
 380         return 0;
 381     }
 382
 383     if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
 384         FIXME("line wrapping not supported.\n");
 385     from = NULL;
 386     if (dwFlags & FORMAT_MESSAGE_FROM_STRING) {
 387         from = HeapAlloc( GetProcessHeap(), 0, (strlenW((LPCWSTR)lpSource) + 1) *
 388             sizeof(WCHAR) );
 389         strcpyW( from, (LPCWSTR)lpSource );
 390     }
 391     else {
 392         from = NULL;
 393         if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
 394             from = load_messageW( (HMODULE)lpSource, dwMessageId, dwLanguageId );
 395         if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
 396             from = load_messageW( kernel32_handle, dwMessageId, dwLanguageId );
 397
 398         if (!from)
 399         {
 400             SetLastError (ERROR_RESOURCE_LANG_NOT_FOUND);
 401             return 0;
 402         }
 403     }
 404     target = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 100 * sizeof(WCHAR) );
 405     t = target;
 406     talloced= 100;
 407
 408 #define ADD_TO_T(c)  do {\
 409     *t++=c;\
 410     if ((DWORD)(t-target) == talloced) {\
 411         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,talloced*2*sizeof(WCHAR));\
 412         t = target+talloced;\
 413         talloced*=2;\
 414     } \
 415 } while (0)
 416
 417     if (from) {
 418         f=from;
 419         if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS) {
 420             while (*f && !eos)
 421                 ADD_TO_T(*f++);
 422         }
 423         else {
 424             while (*f && !eos) {
 425                 if (*f=='%') {
 426                     int insertnr;
 427                     WCHAR *fmtstr,*sprintfbuf,*x;
 428                     DWORD *argliststart;
 429
 430                     fmtstr = NULL;
 431                     f++;
 432                     if (!*f) {
 433                         ADD_TO_T('%');
 434                         continue;
 435                     }
 436
 437                     switch (*f) {
 438                     case '1':case '2':case '3':case '4':case '5':
 439                     case '6':case '7':case '8':case '9':
 440                         insertnr=*f-'0';
 441                         switch (f[1]) {
 442                         case '0':case '1':case '2':case '3':
 443                         case '4':case '5':case '6':case '7':
 444                         case '8':case '9':
 445                             f++;
 446                             insertnr=insertnr*10+*f-'0';
 447                             f++;
 448                             break;
 449                         default:
 450                             f++;
 451                             break;
 452                         }
 453                         if (*f=='!') {
 454                             f++;
 455                             if (NULL!=(x=strchrW(f,'!'))) {
 456                                 *x='\0';
 457                                 fmtstr=HeapAlloc( GetProcessHeap(), 0,(strlenW(f)+2)*sizeof(WCHAR));
 458                                 sprintfW(fmtstr,PCNTFMTWSTR,f);
 459                                 f=x+1;
 460                             } else {
 461                                 fmtstr=HeapAlloc(GetProcessHeap(),0,(strlenW(f)+2)*sizeof(WCHAR));
 462                                 sprintfW(fmtstr,PCNTFMTWSTR,f);
 463                                 f+=strlenW(f); /*at \0*/
 464                             }
 465                         } else {
 466                             if(!args) break;
 467                             fmtstr = HeapAlloc( GetProcessHeap(),0,3*sizeof(WCHAR));
 468                             strcpyW( fmtstr, FMTWSTR );
 469                         }
 470                         if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
 471                             argliststart=args+insertnr-1;
 472                         else
 473                             argliststart=(*(DWORD**)args)+insertnr-1;
 474
 475                         if (fmtstr[strlenW(fmtstr)-1]=='s' && argliststart[0]) {
 476                             DWORD xarr[3];
 477
 478                             xarr[0]=*(argliststart+0);
 479                             /* possible invalid pointers */
 480                             xarr[1]=*(argliststart+1);
 481                             xarr[2]=*(argliststart+2);
 482                             sprintfbuf=HeapAlloc(GetProcessHeap(),0,(strlenW((LPWSTR)argliststart[0])*2+1)*sizeof(WCHAR));
 483
 484                             /* CMF - This makes a BIG assumption about va_list */
 485                             vsprintfW(sprintfbuf, fmtstr, (va_list) xarr);
 486                         } else {
 487                             sprintfbuf=HeapAlloc(GetProcessHeap(),0,100);
 488
 489                             /* CMF - This makes a BIG assumption about va_list */
 490                             vsprintfW(sprintfbuf, fmtstr, (va_list) argliststart);
 491                         }
 492                         x=sprintfbuf;
 493                         while (*x) {
 494                             ADD_TO_T(*x++);
 495                         }
 496                         HeapFree(GetProcessHeap(),0,sprintfbuf);
 497                         HeapFree(GetProcessHeap(),0,fmtstr);
 498                         break;
 499                     case 'n':
 500                         ADD_TO_T('\r');
 501                         ADD_TO_T('\n');
 502                         f++;
 503                         break;
 504                     case '0':
 505                         eos = TRUE;
 506                         f++;
 507                         break;
 508                     default:
 509                         ADD_TO_T(*f++);
 510                         break;
 511                     }
 512                 } else {
 513                     ch = *f;
 514                     f++;
 515                     if (ch == '\r') {
 516                         if (*f == '\n')
 517                             f++;
 518                         if(width)
 519                             ADD_TO_T(' ');
 520                         else
 521                         {
 522                             ADD_TO_T('\r');
 523                             ADD_TO_T('\n');
 524                         }
 525                     } else {
 526                         if (ch == '\n')
 527                         {
 528                             if(width)
 529                                 ADD_TO_T(' ');
 530                             else
 531                             {
 532                                 ADD_TO_T('\r');
 533                                 ADD_TO_T('\n');
 534                             }
 535                         }
 536                         else
 537                             ADD_TO_T(ch);
 538                     }
 539                 }
 540             }
 541         }
 542         *t='\0';
 543     }
 544     talloced = strlenW(target)+1;
 545     if (nSize && talloced<nSize)
 546         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,nSize*sizeof(WCHAR));
 547     if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) {
 548         /* nSize is the MINIMUM size */
 549         DWORD len = strlenW(target) + 1;
 550         *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT,len*sizeof(WCHAR));
 551         strcpyW(*(LPWSTR*)lpBuffer, target);
 552     }
 553     else lstrcpynW(lpBuffer, target, nSize);
 554
 555     HeapFree(GetProcessHeap(),0,target);
 556     HeapFree(GetProcessHeap(),0,from);
 557     TRACE("ret=%s\n", wine_dbgstr_w((dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ?
 558         *(LPWSTR*)lpBuffer : lpBuffer));
 559     return (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ?
 560         strlenW(*(LPWSTR*)lpBuffer):
 561             strlenW(lpBuffer);
 562 #else
 563     return 0;
 564 #endif /* __i386__ */
 565 }
 566 #undef ADD_TO_T