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 FMTWSTR[] = { '%','s',0 };
73 /**********************************************************************
74 * load_message (internal)
76 static LPWSTR load_message( HMODULE module, UINT id, WORD lang )
78 const MESSAGE_RESOURCE_ENTRY *mre;
82 TRACE("module = %p, id = %08x\n", module, id );
84 if (!module) module = GetModuleHandleW( NULL );
85 if ((status = RtlFindMessage( module, RT_MESSAGETABLE, lang, id, &mre )) != STATUS_SUCCESS)
87 SetLastError( RtlNtStatusToDosError(status) );
91 if (mre->Flags & MESSAGE_RESOURCE_UNICODE)
93 int len = (strlenW( (const WCHAR *)mre->Text ) + 1) * sizeof(WCHAR);
94 if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len ))) return NULL;
95 memcpy( buffer, mre->Text, len );
99 int len = MultiByteToWideChar( CP_ACP, 0, (const char *)mre->Text, -1, NULL, 0 );
100 if (!(buffer = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) ))) return NULL;
101 MultiByteToWideChar( CP_ACP, 0, (const char*)mre->Text, -1, buffer, len );
103 TRACE("returning %s\n", wine_dbgstr_w(buffer));
107 /**********************************************************************
110 static ULONG_PTR get_arg( int nr, DWORD flags, struct format_args *args )
112 if (nr == -1) nr = args->last + 1;
115 if (!args->args) args->args = HeapAlloc( GetProcessHeap(), 0, 99 * sizeof(ULONG_PTR) );
116 while (nr > args->last)
117 args->args[args->last++] = va_arg( *args->list, ULONG_PTR );
119 if (nr > args->last) args->last = nr;
120 return args->args[nr - 1];
123 /**********************************************************************
124 * format_insert (internal)
126 static LPCWSTR format_insert( BOOL unicode_caller, int insert, LPCWSTR format,
127 DWORD flags, struct format_args *args,
130 static const WCHAR fmt_lu[] = {'%','l','u',0};
131 WCHAR *wstring = NULL, *p, fmt[256];
135 if (*format != '!') /* simple string */
137 arg = get_arg( insert, flags, args );
138 if (unicode_caller || !arg)
140 static const WCHAR nullW[] = {'(','n','u','l','l',')',0};
141 const WCHAR *str = (const WCHAR *)arg;
143 if (!str) str = nullW;
144 *result = HeapAlloc( GetProcessHeap(), 0, (strlenW(str) + 1) * sizeof(WCHAR) );
145 strcpyW( *result, str );
149 const char *str = (const char *)arg;
150 DWORD length = MultiByteToWideChar( CP_ACP, 0, str, -1, NULL, 0 );
151 *result = HeapAlloc( GetProcessHeap(), 0, length * sizeof(WCHAR) );
152 MultiByteToWideChar( CP_ACP, 0, str, -1, *result, length );
161 while (*format == '0' ||
170 p += sprintfW( p, fmt_lu, get_arg( insert, flags, args ));
174 else *p++ = *format++;
176 while (isdigitW(*format)) *p++ = *format++;
183 p += sprintfW( p, fmt_lu, get_arg( insert, flags, args ));
188 while (isdigitW(*format)) *p++ = *format++;
191 /* replicate MS bug: drop an argument when using va_list with width/precision */
192 if (insert == -1 && args->list) args->last--;
193 arg = get_arg( insert, flags, args );
195 /* check for ascii string format */
196 if ((format[0] == 'h' && format[1] == 's') ||
197 (format[0] == 'h' && format[1] == 'S') ||
198 (unicode_caller && format[0] == 'S') ||
199 (!unicode_caller && format[0] == 's'))
201 DWORD len = MultiByteToWideChar( CP_ACP, 0, (char *)arg, -1, NULL, 0 );
202 wstring = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
203 MultiByteToWideChar( CP_ACP, 0, (char *)arg, -1, wstring, len );
204 arg = (ULONG_PTR)wstring;
207 /* check for ascii character format */
208 else if ((format[0] == 'h' && format[1] == 'c') ||
209 (format[0] == 'h' && format[1] == 'C') ||
210 (unicode_caller && format[0] == 'C') ||
211 (!unicode_caller && format[0] == 'c'))
214 wstring = HeapAlloc( GetProcessHeap(), 0, 2 * sizeof(WCHAR) );
215 MultiByteToWideChar( CP_ACP, 0, &ch, 1, wstring, 1 );
217 arg = (ULONG_PTR)wstring;
220 /* check for wide string format */
221 else if ((format[0] == 'l' && format[1] == 's') ||
222 (format[0] == 'l' && format[1] == 'S') ||
223 (format[0] == 'w' && format[1] == 's') ||
224 (!unicode_caller && format[0] == 'S'))
228 /* check for wide character format */
229 else if ((format[0] == 'l' && format[1] == 'c') ||
230 (format[0] == 'l' && format[1] == 'C') ||
231 (format[0] == 'w' && format[1] == 'c') ||
232 (!unicode_caller && format[0] == 'C'))
236 /* FIXME: handle I64 etc. */
237 else while (*format && *format != '!') *p++ = *format++;
243 WCHAR *ret = HeapAlloc( GetProcessHeap(), 0, size * sizeof(WCHAR) );
244 int needed = snprintfW( ret, size, fmt, arg );
245 if (needed == -1 || needed >= size)
247 HeapFree( GetProcessHeap(), 0, ret );
248 size = max( needed + 1, size * 2 );
257 while (*format && *format != '!') format++;
258 if (*format == '!') format++;
260 HeapFree( GetProcessHeap(), 0, wstring );
264 /**********************************************************************
265 * format_message (internal)
267 static LPWSTR format_message( BOOL unicode_caller, DWORD dwFlags, LPCWSTR fmtstr,
268 struct format_args *format_args )
273 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
277 target = t = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, 100 * sizeof(WCHAR) );
280 #define ADD_TO_T(c) do {\
282 if ((DWORD)(t-target) == talloced) {\
283 target = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,target,talloced*2*sizeof(WCHAR));\
284 t = target+talloced;\
297 case '1':case '2':case '3':case '4':case '5':
298 case '6':case '7':case '8':case '9':
299 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
301 else if (((dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->args) ||
302 (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->list))
304 SetLastError(ERROR_INVALID_PARAMETER);
305 HeapFree(GetProcessHeap(), 0, target);
310 case '0':case '1':case '2':case '3':
311 case '4':case '5':case '6':case '7':
314 insertnr = insertnr*10 + *f-'0';
321 f = format_insert( unicode_caller, insertnr, f, dwFlags, format_args, &str );
322 for (x = str; *x; x++) ADD_TO_T(*x);
323 HeapFree( GetProcessHeap(), 0, str );
343 SetLastError(ERROR_INVALID_PARAMETER);
344 HeapFree(GetProcessHeap(), 0, target);
348 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
388 /***********************************************************************
389 * FormatMessageA (KERNEL32.@)
390 * FIXME: missing wrap,
392 DWORD WINAPI FormatMessageA(
401 struct format_args format_args;
406 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
408 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
409 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
411 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
415 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
419 *(LPSTR *)lpBuffer = NULL;
422 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
424 format_args.args = (ULONG_PTR *)args;
425 format_args.list = NULL;
426 format_args.last = 0;
430 format_args.args = NULL;
431 format_args.list = args;
432 format_args.last = 0;
435 if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
436 FIXME("line wrapping (%u) not supported.\n", width);
438 if (dwFlags & FORMAT_MESSAGE_FROM_STRING)
440 DWORD length = MultiByteToWideChar(CP_ACP, 0, lpSource, -1, NULL, 0);
441 from = HeapAlloc( GetProcessHeap(), 0, length * sizeof(WCHAR) );
442 MultiByteToWideChar(CP_ACP, 0, lpSource, -1, from, length);
444 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
446 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
447 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
448 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
449 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
454 SetLastError(ERROR_INVALID_PARAMETER);
458 target = format_message( FALSE, dwFlags, from, &format_args );
462 TRACE("-- %s\n", debugstr_w(target));
464 /* Only try writing to an output buffer if there are processed characters
465 * in the temporary output buffer. */
468 destlength = WideCharToMultiByte(CP_ACP, 0, target, -1, NULL, 0, NULL, NULL);
469 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
471 LPSTR buf = LocalAlloc(LMEM_ZEROINIT, max(nSize, destlength));
472 WideCharToMultiByte(CP_ACP, 0, target, -1, buf, destlength, NULL, NULL);
473 *((LPSTR*)lpBuffer) = buf;
477 if (nSize < destlength)
479 SetLastError(ERROR_INSUFFICIENT_BUFFER);
482 WideCharToMultiByte(CP_ACP, 0, target, -1, lpBuffer, destlength, NULL, NULL);
484 ret = destlength - 1; /* null terminator */
488 HeapFree(GetProcessHeap(),0,target);
489 HeapFree(GetProcessHeap(),0,from);
490 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
491 TRACE("-- returning %u\n", ret);
495 /***********************************************************************
496 * FormatMessageW (KERNEL32.@)
498 DWORD WINAPI FormatMessageW(
507 struct format_args format_args;
512 DWORD width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
514 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
515 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
519 SetLastError(ERROR_INVALID_PARAMETER);
523 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
524 *(LPWSTR *)lpBuffer = NULL;
526 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
528 format_args.args = (ULONG_PTR *)args;
529 format_args.list = NULL;
530 format_args.last = 0;
534 format_args.args = NULL;
535 format_args.list = args;
536 format_args.last = 0;
539 if (width && width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
540 FIXME("line wrapping not supported.\n");
542 if (dwFlags & FORMAT_MESSAGE_FROM_STRING) {
543 from = HeapAlloc( GetProcessHeap(), 0, (strlenW(lpSource) + 1) *
545 strcpyW( from, lpSource );
547 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
549 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
550 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
551 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
552 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
557 SetLastError(ERROR_INVALID_PARAMETER);
561 target = format_message( TRUE, dwFlags, from, &format_args );
565 talloced = strlenW(target)+1;
566 TRACE("-- %s\n",debugstr_w(target));
568 /* Only allocate a buffer if there are processed characters in the
569 * temporary output buffer. If a caller supplies the buffer, then
570 * a null terminator will be written to it. */
571 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
575 /* nSize is the MINIMUM size */
576 *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT, max(nSize, talloced)*sizeof(WCHAR));
577 strcpyW(*(LPWSTR*)lpBuffer, target);
582 if (nSize < talloced)
584 SetLastError(ERROR_INSUFFICIENT_BUFFER);
587 strcpyW(lpBuffer, target);
590 ret = talloced - 1; /* null terminator */
592 HeapFree(GetProcessHeap(),0,target);
593 HeapFree(GetProcessHeap(),0,from);
594 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
595 TRACE("-- returning %u\n", ret);