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 struct _format_message_data
274 static void format_add_char(struct _format_message_data *fmd, WCHAR c)
277 if (fmd->width && fmd->width != FORMAT_MESSAGE_MAX_WIDTH_MASK)
283 fmd->inspace = FALSE;
288 fmd->space = fmd->t - 1;
293 fmd->inspace = FALSE;
296 if (fmd->w == fmd->width) {
299 notspace = fmd->space;
300 while (*notspace == ' ' && notspace != fmd->t)
303 notspace = fmd->space = fmd->t;
304 fmd->w = fmd->t - notspace;
305 memmove(fmd->space+2, notspace, fmd->w * sizeof(*fmd->t));
306 *fmd->space++ = '\r';
307 *fmd->space++ = '\n';
308 fmd->t = fmd->space + fmd->w;
310 fmd->inspace = FALSE;
313 if ((DWORD)(fmd->t - fmd->formatted) == fmd->size) {
314 DWORD_PTR ispace = fmd->space - fmd->formatted;
315 /* Allocate two extra characters so we can insert a '\r\n' in
316 * the middle of a word.
318 fmd->formatted = HeapReAlloc(GetProcessHeap(), 0, fmd->formatted, (fmd->size * 2 + 2) * sizeof(WCHAR));
319 fmd->t = fmd->formatted + fmd->size;
321 fmd->space = fmd->formatted + ispace;
326 /**********************************************************************
327 * format_message (internal)
329 static LPWSTR format_message( BOOL unicode_caller, DWORD dwFlags, LPCWSTR fmtstr,
330 struct format_args *format_args )
332 struct _format_message_data fmd;
337 fmd.formatted = fmd.t = HeapAlloc( GetProcessHeap(), 0, (fmd.size + 2) * sizeof(WCHAR) );
339 fmd.width = dwFlags & FORMAT_MESSAGE_MAX_WIDTH_MASK;
351 case '1':case '2':case '3':case '4':case '5':
352 case '6':case '7':case '8':case '9':
353 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
355 else if (((dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->args) ||
356 (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY) && !format_args->list))
358 SetLastError(ERROR_INVALID_PARAMETER);
359 HeapFree(GetProcessHeap(), 0, fmd.formatted);
364 case '0':case '1':case '2':case '3':
365 case '4':case '5':case '6':case '7':
368 insertnr = insertnr*10 + *f-'0';
375 f = format_insert( unicode_caller, insertnr, f, dwFlags, format_args, &str );
376 for (x = str; *x; x++) format_add_char(&fmd, *x);
377 HeapFree( GetProcessHeap(), 0, str );
380 format_add_char(&fmd, '\r');
381 format_add_char(&fmd, '\n');
385 format_add_char(&fmd, '\r');
389 format_add_char(&fmd, '\t');
397 SetLastError(ERROR_INVALID_PARAMETER);
398 HeapFree(GetProcessHeap(), 0, fmd.formatted);
402 if (dwFlags & FORMAT_MESSAGE_IGNORE_INSERTS)
403 format_add_char(&fmd, '%');
404 format_add_char(&fmd, *f++);
414 format_add_char(&fmd, ' ');
417 format_add_char(&fmd, '\r');
418 format_add_char(&fmd, '\n');
424 format_add_char(&fmd, ' ');
427 format_add_char(&fmd, '\r');
428 format_add_char(&fmd, '\n');
432 format_add_char(&fmd, ch);
438 return fmd.formatted;
441 /***********************************************************************
442 * FormatMessageA (KERNEL32.@)
444 DWORD WINAPI FormatMessageA(
453 struct format_args format_args;
459 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
460 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
462 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
466 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
470 *(LPSTR *)lpBuffer = NULL;
473 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
475 format_args.args = (ULONG_PTR *)args;
476 format_args.list = NULL;
477 format_args.last = 0;
481 format_args.args = NULL;
482 format_args.list = args;
483 format_args.last = 0;
487 if (dwFlags & FORMAT_MESSAGE_FROM_STRING)
489 DWORD length = MultiByteToWideChar(CP_ACP, 0, lpSource, -1, NULL, 0);
490 from = HeapAlloc( GetProcessHeap(), 0, length * sizeof(WCHAR) );
491 MultiByteToWideChar(CP_ACP, 0, lpSource, -1, from, length);
493 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
495 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
496 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
497 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
498 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
503 SetLastError(ERROR_INVALID_PARAMETER);
507 target = format_message( FALSE, dwFlags, from, &format_args );
511 TRACE("-- %s\n", debugstr_w(target));
513 /* Only try writing to an output buffer if there are processed characters
514 * in the temporary output buffer. */
517 destlength = WideCharToMultiByte(CP_ACP, 0, target, -1, NULL, 0, NULL, NULL);
518 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
520 LPSTR buf = LocalAlloc(LMEM_ZEROINIT, max(nSize, destlength));
521 WideCharToMultiByte(CP_ACP, 0, target, -1, buf, destlength, NULL, NULL);
522 *((LPSTR*)lpBuffer) = buf;
526 if (nSize < destlength)
528 SetLastError(ERROR_INSUFFICIENT_BUFFER);
531 WideCharToMultiByte(CP_ACP, 0, target, -1, lpBuffer, destlength, NULL, NULL);
533 ret = destlength - 1; /* null terminator */
537 HeapFree(GetProcessHeap(),0,target);
538 HeapFree(GetProcessHeap(),0,from);
539 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
540 TRACE("-- returning %u\n", ret);
544 /***********************************************************************
545 * FormatMessageW (KERNEL32.@)
547 DWORD WINAPI FormatMessageW(
556 struct format_args format_args;
562 TRACE("(0x%x,%p,%d,0x%x,%p,%d,%p)\n",
563 dwFlags,lpSource,dwMessageId,dwLanguageId,lpBuffer,nSize,args);
567 SetLastError(ERROR_INVALID_PARAMETER);
571 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
572 *(LPWSTR *)lpBuffer = NULL;
574 if (dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)
576 format_args.args = (ULONG_PTR *)args;
577 format_args.list = NULL;
578 format_args.last = 0;
582 format_args.args = NULL;
583 format_args.list = args;
584 format_args.last = 0;
588 if (dwFlags & FORMAT_MESSAGE_FROM_STRING) {
589 from = HeapAlloc( GetProcessHeap(), 0, (strlenW(lpSource) + 1) *
591 strcpyW( from, lpSource );
593 else if (dwFlags & (FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_FROM_SYSTEM))
595 if (dwFlags & FORMAT_MESSAGE_FROM_HMODULE)
596 from = load_message( (HMODULE)lpSource, dwMessageId, dwLanguageId );
597 if (!from && (dwFlags & FORMAT_MESSAGE_FROM_SYSTEM))
598 from = load_message( kernel32_handle, dwMessageId, dwLanguageId );
603 SetLastError(ERROR_INVALID_PARAMETER);
607 target = format_message( TRUE, dwFlags, from, &format_args );
611 talloced = strlenW(target)+1;
612 TRACE("-- %s\n",debugstr_w(target));
614 /* Only allocate a buffer if there are processed characters in the
615 * temporary output buffer. If a caller supplies the buffer, then
616 * a null terminator will be written to it. */
617 if (dwFlags & FORMAT_MESSAGE_ALLOCATE_BUFFER)
621 /* nSize is the MINIMUM size */
622 *((LPVOID*)lpBuffer) = LocalAlloc(LMEM_ZEROINIT, max(nSize, talloced)*sizeof(WCHAR));
623 strcpyW(*(LPWSTR*)lpBuffer, target);
628 if (nSize < talloced)
630 SetLastError(ERROR_INSUFFICIENT_BUFFER);
633 strcpyW(lpBuffer, target);
636 ret = talloced - 1; /* null terminator */
638 HeapFree(GetProcessHeap(),0,target);
639 HeapFree(GetProcessHeap(),0,from);
640 if (!(dwFlags & FORMAT_MESSAGE_ARGUMENT_ARRAY)) HeapFree( GetProcessHeap(), 0, format_args.args );
641 TRACE("-- returning %u\n", ret);