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         __ms_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(lpSource) + 1 );
 169         strcpy( from, 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 || strcmp(fmtstr,"%ws") == 0)
 261                             {
 262                                 sz = WideCharToMultiByte(CP_ACP, 0, *(WCHAR**)argliststart, -1, NULL, 0, NULL, NULL);
 263                                 b = HeapAlloc(GetProcessHeap(), 0, sz);
 264                                 WideCharToMultiByte(CP_ACP, 0, *(WCHAR**)argliststart, -1, b, sz, NULL, NULL);
 265                             }
 266                             else if (strcmp(fmtstr, "%wc") == 0)
 267                             {
 268                                 sz = WideCharToMultiByte(CP_ACP, 0, (WCHAR *)argliststart, 1, NULL, 0, NULL, NULL);
 269                                 b = HeapAlloc(GetProcessHeap(), 0, sz + 1);
 270                                 WideCharToMultiByte(CP_ACP, 0, (WCHAR *)argliststart, 1, b, sz, NULL, NULL);
 271                                 b[sz] = 0;
 272                             }
 273                             else
 274                             {
 275                                 b = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sz = 1000);
 276                                 /* CMF - This makes a BIG assumption about va_list */
 277                                 TRACE("A BIG assumption\n");
 278                                 vsnprintf(b, sz, fmtstr, (va_list) argliststart);
 279                             }
 280                             for (x=b; *x; x++) ADD_TO_T(*x);
 281
 282                             HeapFree(GetProcessHeap(),0,b);
 283                         } else {
 284                                 /* NULL args - copy formatstr
 285                                  * (probably wrong)
 286                                  */
 287                             while ((lastf<f)&&(*lastf)) {
 288                                 ADD_TO_T(*lastf++);
 289                             }
 290                         }
 291                         HeapFree(GetProcessHeap(),0,fmtstr);
 292                         break;
 293                     case 'n':
 294                         ADD_TO_T('\r');
 295                         ADD_TO_T('\n');
 296                         f++;
 297                         break;
 298                     case '0':
 299                         eos = TRUE;
 300                         f++;
 301                         break;
 302                     default:
 303                         ADD_TO_T(*f++);
 304                         break;
 305                     }
 306                 } else {
 307                     ch = *f;
 308                     f++;
 309                     if (ch == '\r') {
 310                         if (*f == '\n')
 311                             f++;
 312                         if(width)
 313                             ADD_TO_T(' ');
 314                         else
 315                         {
 316                             ADD_TO_T('\r');
 317                             ADD_TO_T('\n');
 318                         }
 319                     } else {
 320                         if (ch == '\n')
 321                         {
 322                             if(width)
 323                                 ADD_TO_T(' ');
 324                             else
 325                             {
 326                                 ADD_TO_T('\r');
 327                                 ADD_TO_T('\n');
 328                             }
 329                         }
 330                         else
 331                             ADD_TO_T(ch);
 332                     }
 333                 }
 334             }
 335         }
 336         *t='\0';
 337     }
 338     talloced = strlen(target)+1;
 339     if (nSize && talloced<nSize) {
 340         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,nSize);
 341     }
 342     TRACE("-- %s\n",debugstr_a(target));
 343     if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) {
 344         *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT,max(nSize, talloced));
 345         memcpy(*(LPSTR*)lpBuffer,target,talloced);
 346     } else {
 347         lstrcpynA(lpBuffer,target,nSize);
 348     }
 349     HeapFree(GetProcessHeap(),0,target);
 350     HeapFree(GetProcessHeap(),0,from);
 351     ret = (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ? strlen(*(LPSTR*)lpBuffer) : strlen(lpBuffer);
 352 #endif /* __i386__ */
 353     TRACE("-- returning %d\n", ret);
 354     return ret;
 355 }
 356 #undef ADD_TO_T
 357
 358
 359 /***********************************************************************
 360  *           FormatMessageW   (KERNEL32.@)
 361  */
 362 DWORD WINAPI FormatMessageW(
 363         DWORD   dwFlags,
 364         LPCVOID lpSource,
 365         DWORD   dwMessageId,
 366         DWORD   dwLanguageId,
 367         LPWSTR  lpBuffer,
 368         DWORD   nSize,
 369         __ms_va_list* _args )
 370 {
 371     LPDWORD args=(LPDWORD)_args;
 372 #if defined(__i386__) || defined(__sparc__)
 373 /* This implementation is completely dependent on the format of the va_list on x86 CPUs */
 374     LPWSTR target,t;
 375     DWORD talloced;
 376     LPWSTR from,f;
 377     DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
 378     BOOL eos = FALSE;
 379     WCHAR ch;
 380     static const WCHAR fmt_wc[] = {'%','w','c',0};
 381
 382     TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
 383           dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
 384     if ((dwFlags & FORMAT_MESSAGE_FROM_STRING)
 385         &&((dwFlags & FORMAT_MESSAGE_FROM_SYSTEM)
 386            || (dwFlags & FORMAT_MESSAGE_FROM_HMODULE))) return 0;
 387
 388     if (!lpBuffer)
 389     {
 390         SetLastError(ERROR_INVALID_PARAMETER);
 391         return 0;
 392     }
 393
 394     if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
 395         FIXME("line wrapping not supported.\n");
 396     from = NULL;
 397     if (dwFlags & FORMAT_MESSAGE_FROM_STRING) {
 398         from = HeapAlloc( GetProcessHeap(), 0, (strlenW(lpSource) + 1) *
 399             sizeof(WCHAR) );
 400         strcpyW( from, lpSource );
 401     }
 402     else {
 403         from = NULL;
 404         if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
 405             from = load_messageW( (HMODULE)lpSource, dwMessageId, dwLanguageId );
 406         if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
 407             from = load_messageW( kernel32_handle, dwMessageId, dwLanguageId );
 408
 409         if (!from)
 410         {
 411             SetLastError (ERROR_RESOURCE_LANG_NOT_FOUND);
 412             return 0;
 413         }
 414     }
 415     target = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 100 * sizeof(WCHAR) );
 416     t = target;
 417     talloced= 100;
 418
 419 #define ADD_TO_T(c)  do {\
 420     *t++=c;\
 421     if ((DWORD)(t-target) == talloced) {\
 422         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,talloced*2*sizeof(WCHAR));\
 423         t = target+talloced;\
 424         talloced*=2;\
 425     } \
 426 } while (0)
 427
 428     if (from) {
 429         f=from;
 430         if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS) {
 431             while (*f && !eos)
 432                 ADD_TO_T(*f++);
 433         }
 434         else {
 435             while (*f && !eos) {
 436                 if (*f=='%') {
 437                     int insertnr;
 438                     WCHAR *fmtstr,*sprintfbuf,*x;
 439                     DWORD *argliststart;
 440
 441                     fmtstr = NULL;
 442                     f++;
 443                     if (!*f) {
 444                         ADD_TO_T('%');
 445                         continue;
 446                     }
 447
 448                     switch (*f) {
 449                     case '1':case '2':case '3':case '4':case '5':
 450                     case '6':case '7':case '8':case '9':
 451                         insertnr=*f-'0';
 452                         switch (f[1]) {
 453                         case '0':case '1':case '2':case '3':
 454                         case '4':case '5':case '6':case '7':
 455                         case '8':case '9':
 456                             f++;
 457                             insertnr=insertnr*10+*f-'0';
 458                             f++;
 459                             break;
 460                         default:
 461                             f++;
 462                             break;
 463                         }
 464                         if (*f=='!') {
 465                             f++;
 466                             if (NULL!=(x=strchrW(f,'!'))) {
 467                                 *x='\0';
 468                                 fmtstr=HeapAlloc( GetProcessHeap(), 0,(strlenW(f)+2)*sizeof(WCHAR));
 469                                 sprintfW(fmtstr,PCNTFMTWSTR,f);
 470                                 f=x+1;
 471                             } else {
 472                                 fmtstr=HeapAlloc(GetProcessHeap(),0,(strlenW(f)+2)*sizeof(WCHAR));
 473                                 sprintfW(fmtstr,PCNTFMTWSTR,f);
 474                                 f+=strlenW(f); /*at \0*/
 475                             }
 476                         } else {
 477                             if(!args) break;
 478                             fmtstr = HeapAlloc( GetProcessHeap(),0,3*sizeof(WCHAR));
 479                             strcpyW( fmtstr, FMTWSTR );
 480                         }
 481                         if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
 482                             argliststart=args+insertnr-1;
 483                         else
 484                             argliststart=(*(DWORD**)args)+insertnr-1;
 485
 486                         if (fmtstr[strlenW(fmtstr)-1]=='s' && argliststart[0]) {
 487                             DWORD xarr[3];
 488
 489                             xarr[0]=*(argliststart+0);
 490                             /* possible invalid pointers */
 491                             xarr[1]=*(argliststart+1);
 492                             xarr[2]=*(argliststart+2);
 493                             sprintfbuf=HeapAlloc(GetProcessHeap(),0,(strlenW((LPWSTR)argliststart[0])*2+1)*sizeof(WCHAR));
 494
 495                             /* CMF - This makes a BIG assumption about va_list */
 496                             vsprintfW(sprintfbuf, fmtstr, (va_list) xarr);
 497                         }
 498                         else if (strcmpW(fmtstr, fmt_wc) == 0) {
 499                             sprintfbuf = HeapAlloc(GetProcessHeap(), 0, sizeof(WCHAR) * 2);
 500                             sprintfbuf[0] = *(WCHAR *)argliststart;
 501                             sprintfbuf[1] = 0;
 502                         } else {
 503                             sprintfbuf=HeapAlloc(GetProcessHeap(),0,100);
 504
 505                             /* CMF - This makes a BIG assumption about va_list */
 506                             vsprintfW(sprintfbuf, fmtstr, (va_list) argliststart);
 507                         }
 508                         x=sprintfbuf;
 509                         while (*x) {
 510                             ADD_TO_T(*x++);
 511                         }
 512                         HeapFree(GetProcessHeap(),0,sprintfbuf);
 513                         HeapFree(GetProcessHeap(),0,fmtstr);
 514                         break;
 515                     case 'n':
 516                         ADD_TO_T('\r');
 517                         ADD_TO_T('\n');
 518                         f++;
 519                         break;
 520                     case '0':
 521                         eos = TRUE;
 522                         f++;
 523                         break;
 524                     default:
 525                         ADD_TO_T(*f++);
 526                         break;
 527                     }
 528                 } else {
 529                     ch = *f;
 530                     f++;
 531                     if (ch == '\r') {
 532                         if (*f == '\n')
 533                             f++;
 534                         if(width)
 535                             ADD_TO_T(' ');
 536                         else
 537                         {
 538                             ADD_TO_T('\r');
 539                             ADD_TO_T('\n');
 540                         }
 541                     } else {
 542                         if (ch == '\n')
 543                         {
 544                             if(width)
 545                                 ADD_TO_T(' ');
 546                             else
 547                             {
 548                                 ADD_TO_T('\r');
 549                                 ADD_TO_T('\n');
 550                             }
 551                         }
 552                         else
 553                             ADD_TO_T(ch);
 554                     }
 555                 }
 556             }
 557         }
 558         *t='\0';
 559     }
 560     talloced = strlenW(target)+1;
 561     if (nSize && talloced<nSize)
 562         target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,nSize*sizeof(WCHAR));
 563     if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) {
 564         /* nSize is the MINIMUM size */
 565         DWORD len = strlenW(target) + 1;
 566         *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT,len*sizeof(WCHAR));
 567         strcpyW(*(LPWSTR*)lpBuffer, target);
 568     }
 569     else lstrcpynW(lpBuffer, target, nSize);
 570
 571     HeapFree(GetProcessHeap(),0,target);
 572     HeapFree(GetProcessHeap(),0,from);
 573     TRACE("ret=%s\n", wine_dbgstr_w((dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ?
 574         *(LPWSTR*)lpBuffer : lpBuffer));
 575     return (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER) ?
 576         strlenW(*(LPWSTR*)lpBuffer):
 577             strlenW(lpBuffer);
 578 #else
 579     return 0;
 580 #endif /* __i386__ */
 581 }
 582 #undef ADD_TO_T