2 * FormatMessage implementation
4 * Copyright 1996 Marcus Meissner
5 * Copyright 2009 Alexandre Julliard
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
29 #define WIN32_NO_STATUS
36 #include "wine/unicode.h"
37 #include "kernel_private.h"
38 #include "wine/debug.h"
40 WINE_DEFAULT_DEBUG_CHANNEL(resource);
49 /* Messages used by FormatMessage
51 * They can be specified either directly or using a message ID and
52 * loading them from the resource.
54 * The resourcedata has following format:
56 * 0: DWORD nrofentries
57 * nrofentries * subentry:
60 * 8: DWORD offset from start to the stringentries
62 * (lastentry-firstentry) * stringentry:
63 * 0: WORD len (0 marks end) [ includes the 4 byte header length ]
66 * (stringentry i of a subentry refers to the ID 'firstentry+i')
68 * Yes, ANSI strings in win32 resources. Go figure.
71 static const WCHAR PCNTFMTWSTR[] = { '%','%','%','s',0 };
72 static const WCHAR FMTWSTR[] = { '%','s',0 };
74 /**********************************************************************
75 * load_message (internal)
77 static LPWSTR load_message( HMODULE module, UINT id, WORD lang )
79 const MESSAGE_RESOURCE_ENTRY *mre;
83 TRACE("module = %p, id = %08x\n", module, id );
85 if (!module) module = GetModuleHandleW( NULL );
86 if ((status = RtlFindMessage( module, RT_MESSAGETABLE, lang, id, &mre )) != STATUS_SUCCESS)
88 SetLastError( RtlNtStatusToDosError(status) );
92 if (mre->Flags & MESSAGE_RESOURCE_UNICODE)
94 int len = (strlenW( (const WCHAR *)mre->Text ) + 1) * sizeof(WCHAR);
95 if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len ))) return NULL;
96 memcpy( buffer, mre->Text, len );
100 int len = MultiByteToWideChar( CP_ACP, 0, (const char *)mre->Text, -1, NULL, 0 );
101 if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) ))) return NULL;
102 MultiByteToWideChar( CP_ACP, 0, (const char*)mre->Text, -1, buffer, len );
104 TRACE("returning %s\n", wine_dbgstr_w(buffer));
108 /**********************************************************************
111 static ULONG_PTR get_arg( int nr, DWORD flags, struct format_args *args )
113 if (nr == -1) nr = args->last + 1;
116 if (!args->args) args->args = HeapAlloc( GetProcessHeap(), 0, 99 * sizeof(ULONG_PTR) );
117 while (nr > args->last)
118 args->args[args->last++] = va_arg( *args->list, ULONG_PTR );
120 if (nr > args->last) args->last = nr;
121 return args->args[nr - 1];
124 /**********************************************************************
125 * format_insert (internal)
127 static LPCWSTR format_insert( BOOL unicode_caller, int insert, LPCWSTR format,
128 DWORD flags, struct format_args *args,
131 static const WCHAR fmt_lu[] = {'%','l','u',0};
132 WCHAR *wstring = NULL, *p, fmt[256];
136 if (*format != '!') /* simple string */
138 arg = get_arg( insert, flags, args );
141 WCHAR *str = (WCHAR *)arg;
142 *result = HeapAlloc( GetProcessHeap(), 0, (strlenW(str) + 1) * sizeof(WCHAR) );
143 strcpyW( *result, str );
147 char *str = (char *)arg;
148 DWORD length = MultiByteToWideChar( CP_ACP, 0, str, -1, NULL, 0 );
149 *result = HeapAlloc( GetProcessHeap(), 0, length * sizeof(WCHAR) );
150 MultiByteToWideChar( CP_ACP, 0, str, -1, *result, length );
159 while (*format == '0' ||
168 p += sprintfW( p, fmt_lu, get_arg( insert, flags, args ));
172 else *p++ = *format++;
174 while (isdigitW(*format)) *p++ = *format++;
181 p += sprintfW( p, fmt_lu, get_arg( insert, flags, args ));
186 while (isdigitW(*format)) *p++ = *format++;
189 /* replicate MS bug: drop an argument when using va_list with width/precision */
190 if (insert == -1 && args->list) args->last--;
191 arg = get_arg( insert, flags, args );
193 /* check for ascii string format */
194 if ((format[0] == 'h' && format[1] == 's') ||
195 (format[0] == 'h' && format[1] == 'S') ||
196 (unicode_caller && format[0] == 'S') ||
197 (!unicode_caller && format[0] == 's'))
199 DWORD len = MultiByteToWideChar( CP_ACP, 0, (char *)arg, -1, NULL, 0 );
200 wstring = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
201 MultiByteToWideChar( CP_ACP, 0, (char *)arg, -1, wstring, len );
202 arg = (ULONG_PTR)wstring;
205 /* check for ascii character format */
206 else if ((format[0] == 'h' && format[1] == 'c') ||
207 (format[0] == 'h' && format[1] == 'C') ||
208 (unicode_caller && format[0] == 'C') ||
209 (!unicode_caller && format[0] == 'c'))
212 wstring = HeapAlloc( GetProcessHeap(), 0, 2 * sizeof(WCHAR) );
213 MultiByteToWideChar( CP_ACP, 0, &ch, 1, wstring, 1 );
215 arg = (ULONG_PTR)wstring;
218 /* check for wide string format */
219 else if ((format[0] == 'l' && format[1] == 's') ||
220 (format[0] == 'l' && format[1] == 'S') ||
221 (format[0] == 'w' && format[1] == 's') ||
222 (!unicode_caller && format[0] == 'S'))
226 /* check for wide character format */
227 else if ((format[0] == 'l' && format[1] == 'c') ||
228 (format[0] == 'l' && format[1] == 'C') ||
229 (format[0] == 'w' && format[1] == 'c') ||
230 (!unicode_caller && format[0] == 'C'))
234 /* FIXME: handle I64 etc. */
235 else while (*format && *format != '!') *p++ = *format++;
241 WCHAR *ret = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
242 int needed = snprintfW( ret, size, fmt, arg );
243 if (needed == -1 || needed >= size)
245 HeapFree( GetProcessHeap(), 0, ret );
246 size = max( needed + 1, size * 2 );
255 while (*format && *format != '!') format++;
256 if (*format == '!') format++;
258 HeapFree( GetProcessHeap(), 0, wstring );
262 /**********************************************************************
263 * format_message (internal)
265 static LPWSTR format_message( BOOL unicode_caller, DWORD dwFlags, LPCWSTR fmtstr,
266 struct format_args *format_args )
271 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
275 target = t = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 100 * sizeof(WCHAR) );
278 #define ADD_TO_T(c) do {\
280 if ((DWORD)(t-target) == talloced) {\
281 target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,talloced*2*sizeof(WCHAR));\
282 t = target+talloced;\
295 case '1':case '2':case '3':case '4':case '5':
296 case '6':case '7':case '8':case '9':
297 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
299 else if (((dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->args) ||
300 (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->list))
302 SetLastError(ERROR_INVALID_PARAMETER);
303 HeapFree(GetProcessHeap(), 0, target);
308 case '0':case '1':case '2':case '3':
309 case '4':case '5':case '6':case '7':
312 insertnr = insertnr*10 + *f-'0';
319 f = format_insert( unicode_caller, insertnr, f, dwFlags, format_args, &str );
320 for (x = str; *x; x++) ADD_TO_T(*x);
321 HeapFree( GetProcessHeap(), 0, str );
341 SetLastError(ERROR_INVALID_PARAMETER);
342 HeapFree(GetProcessHeap(), 0, target);
346 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
386 /***********************************************************************
387 * FormatMessageA (KERNEL32.@)
388 * FIXME: missing wrap,
390 DWORD WINAPI FormatMessageA(
399 struct format_args format_args;
404 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
406 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
407 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
409 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
413 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
417 *(LPSTR *)lpBuffer = NULL;
420 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
422 format_args.args = (ULONG_PTR *)args;
423 format_args.list = NULL;
424 format_args.last = 0;
428 format_args.args = NULL;
429 format_args.list = args;
430 format_args.last = 0;
433 if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
434 FIXME("line wrapping (%u) not supported.\n", width);
436 if (dwFlags & FORMAT_MESSAGE_FROM_STRING)
438 DWORD length = MultiByteToWideChar(CP_ACP, 0, lpSource, -1, NULL, 0);
439 from = HeapAlloc( GetProcessHeap(), 0, length * sizeof(WCHAR) );
440 MultiByteToWideChar(CP_ACP, 0, lpSource, -1, from, length);
442 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
444 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
445 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
446 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
447 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
452 SetLastError(ERROR_INVALID_PARAMETER);
456 target = format_message( FALSE, dwFlags, from, &format_args );
460 TRACE("-- %s\n", debugstr_w(target));
462 /* Only try writing to an output buffer if there are processed characters
463 * in the temporary output buffer. */
466 destlength = WideCharToMultiByte(CP_ACP, 0, target, -1, NULL, 0, NULL, NULL);
467 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
469 LPSTR buf = LocalAlloc(LMEM_ZEROINIT, max(nSize, destlength));
470 WideCharToMultiByte(CP_ACP, 0, target, -1, buf, destlength, NULL, NULL);
471 *((LPSTR*)lpBuffer) = buf;
475 if (nSize < destlength)
477 SetLastError(ERROR_INSUFFICIENT_BUFFER);
480 WideCharToMultiByte(CP_ACP, 0, target, -1, lpBuffer, destlength, NULL, NULL);
482 ret = destlength - 1; /* null terminator */
486 HeapFree(GetProcessHeap(),0,target);
487 HeapFree(GetProcessHeap(),0,from);
488 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
489 TRACE("-- returning %u\n", ret);
493 /***********************************************************************
494 * FormatMessageW (KERNEL32.@)
496 DWORD WINAPI FormatMessageW(
505 struct format_args format_args;
510 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
512 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
513 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
517 SetLastError(ERROR_INVALID_PARAMETER);
521 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
522 *(LPWSTR *)lpBuffer = NULL;
524 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
526 format_args.args = (ULONG_PTR *)args;
527 format_args.list = NULL;
528 format_args.last = 0;
532 format_args.args = NULL;
533 format_args.list = args;
534 format_args.last = 0;
537 if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
538 FIXME("line wrapping not supported.\n");
540 if (dwFlags & FORMAT_MESSAGE_FROM_STRING) {
541 from = HeapAlloc( GetProcessHeap(), 0, (strlenW(lpSource) + 1) *
543 strcpyW( from, lpSource );
545 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
547 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
548 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
549 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
550 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
555 SetLastError(ERROR_INVALID_PARAMETER);
559 target = format_message( TRUE, dwFlags, from, &format_args );
563 talloced = strlenW(target)+1;
564 TRACE("-- %s\n",debugstr_w(target));
566 /* Only allocate a buffer if there are processed characters in the
567 * temporary output buffer. If a caller supplies the buffer, then
568 * a null terminator will be written to it. */
569 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
573 /* nSize is the MINIMUM size */
574 *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT, max(nSize, talloced)*sizeof(WCHAR));
575 strcpyW(*(LPWSTR*)lpBuffer, target);
580 if (nSize < talloced)
582 SetLastError(ERROR_INSUFFICIENT_BUFFER);
585 strcpyW(lpBuffer, target);
588 ret = talloced - 1; /* null terminator */
590 HeapFree(GetProcessHeap(),0,target);
591 HeapFree(GetProcessHeap(),0,from);
592 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
593 TRACE("-- returning %u\n", ret);