VBoxAutostartCfg.cpp@ 97698

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1	/* $Id: VBoxAutostartCfg.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VBoxAutostart - VirtualBox Autostart service, configuration parser.
4	*/
5
6	/*
7	* Copyright (C) 2012-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#include <iprt/ctype.h>
33	#include <iprt/err.h>
34	#include <iprt/mem.h>
35	#include <iprt/message.h>
36	#include <iprt/process.h>
37	#include <iprt/stream.h>
38	#include <iprt/string.h>
39
40	#include "VBoxAutostart.h"
41
42
43	/*********************************************************************************************************************************
44	* Constants And Macros, Structures and Typedefs *
45	*********************************************************************************************************************************/
46
47	/**
48	* Token type.
49	*/
50	typedef enum CFGTOKENTYPE
51	{
52	/** Invalid token type. */
53	CFGTOKENTYPE_INVALID = 0,
54	/** Identifier. */
55	CFGTOKENTYPE_ID,
56	/** Comma. */
57	CFGTOKENTYPE_COMMA,
58	/** Equal sign. */
59	CFGTOKENTYPE_EQUAL,
60	/** Open curly brackets. */
61	CFGTOKENTYPE_CURLY_OPEN,
62	/** Closing curly brackets. */
63	CFGTOKENTYPE_CURLY_CLOSING,
64	/** End of file. */
65	CFGTOKENTYPE_EOF,
66	/** 32bit hack. */
67	CFGTOKENTYPE_32BIT_HACK = 0x7fffffff
68	} CFGTOKENTYPE;
69	/** Pointer to a token type. */
70	typedef CFGTOKENTYPE *PCFGTOKENTYPE;
71	/** Pointer to a const token type. */
72	typedef const CFGTOKENTYPE *PCCFGTOKENTYPE;
73
74	/**
75	* A token.
76	*/
77	typedef struct CFGTOKEN
78	{
79	/** Type of the token. */
80	CFGTOKENTYPE enmType;
81	/** Line number of the token. */
82	unsigned iLine;
83	/** Starting character of the token in the stream. */
84	size_t cchStart;
85	/** Type dependen token data. */
86	union
87	{
88	/** Data for the ID type. */
89	struct
90	{
91	/** Size of the id in characters, excluding the \0 terminator. */
92	size_t cchToken;
93	/** Token data, variable size (given by cchToken member). */
94	char achToken[1];
95	} Id;
96	} u;
97	} CFGTOKEN;
98	/** Pointer to a token. */
99	typedef CFGTOKEN *PCFGTOKEN;
100	/** Pointer to a const token. */
101	typedef const CFGTOKEN *PCCFGTOKEN;
102
103	/**
104	* Tokenizer instance data for the config data.
105	*/
106	typedef struct CFGTOKENIZER
107	{
108	/** Config file handle. */
109	PRTSTREAM hStrmConfig;
110	/** String buffer for the current line we are operating in. */
111	char *pszLine;
112	/** Size of the string buffer. */
113	size_t cbLine;
114	/** Current position in the line. */
115	char *pszLineCurr;
116	/** Current line in the config file. */
117	unsigned iLine;
118	/** Current character of the line. */
119	size_t cchCurr;
120	/** Flag whether the end of the config stream is reached. */
121	bool fEof;
122	/** Pointer to the next token in the stream (used to peek). */
123	PCFGTOKEN pTokenNext;
124	} CFGTOKENIZER, *PCFGTOKENIZER;
125
126
127	/*********************************************************************************************************************************
128	* Internal Functions *
129	*********************************************************************************************************************************/
130
131	/**
132	* Free a config token.
133	*
134	* @returns nothing.
135	* @param pCfgTokenizer The config tokenizer.
136	* @param pToken The token to free.
137	*/
138	static void autostartConfigTokenFree(PCFGTOKENIZER pCfgTokenizer, PCFGTOKEN pToken)
139	{
140	NOREF(pCfgTokenizer);
141	RTMemFree(pToken);
142	}
143
144	/**
145	* Reads the next line from the config stream.
146	*
147	* @returns VBox status code.
148	* @param pCfgTokenizer The config tokenizer.
149	*/
150	static int autostartConfigTokenizerReadNextLine(PCFGTOKENIZER pCfgTokenizer)
151	{
152	int rc = VINF_SUCCESS;
153
154	if (pCfgTokenizer->fEof)
155	return VERR_EOF;
156
157	do
158	{
159	rc = RTStrmGetLine(pCfgTokenizer->hStrmConfig, pCfgTokenizer->pszLine,
160	pCfgTokenizer->cbLine);
161	if (rc == VERR_BUFFER_OVERFLOW)
162	{
163	char *pszTmp;
164
165	pCfgTokenizer->cbLine += 128;
166	pszTmp = (char *)RTMemRealloc(pCfgTokenizer->pszLine, pCfgTokenizer->cbLine);
167	if (pszTmp)
168	pCfgTokenizer->pszLine = pszTmp;
169	else
170	rc = VERR_NO_MEMORY;
171	}
172	} while (rc == VERR_BUFFER_OVERFLOW);
173
174	if ( RT_SUCCESS(rc)
175	\|\| rc == VERR_EOF)
176	{
177	pCfgTokenizer->iLine++;
178	pCfgTokenizer->cchCurr = 1;
179	pCfgTokenizer->pszLineCurr = pCfgTokenizer->pszLine;
180	if (rc == VERR_EOF)
181	pCfgTokenizer->fEof = true;
182	}
183
184	return rc;
185	}
186
187	/**
188	* Get the next token from the config stream and create a token structure.
189	*
190	* @returns VBox status code.
191	* @param pCfgTokenizer The config tokenizer data.
192	* @param pCfgTokenUse Allocated token structure to use or NULL to allocate
193	* a new one. It will bee freed if an error is encountered.
194	* @param ppCfgToken Where to store the pointer to the next token on success.
195	*/
196	static int autostartConfigTokenizerCreateToken(PCFGTOKENIZER pCfgTokenizer,
197	PCFGTOKEN pCfgTokenUse, PCFGTOKEN *ppCfgToken)
198	{
199	const char *pszToken = NULL;
200	size_t cchToken = 1;
201	size_t cchAdvance = 0;
202	CFGTOKENTYPE enmType = CFGTOKENTYPE_INVALID;
203	int rc = VINF_SUCCESS;
204
205	for (;;)
206	{
207	pszToken = pCfgTokenizer->pszLineCurr;
208
209	/* Skip all spaces. */
210	while (RT_C_IS_BLANK(*pszToken))
211	{
212	pszToken++;
213	cchAdvance++;
214	}
215
216	/* Check if we have to read a new line. */
217	if ( *pszToken == '\0'
218	\|\| *pszToken == '#')
219	{
220	rc = autostartConfigTokenizerReadNextLine(pCfgTokenizer);
221	if (rc == VERR_EOF)
222	{
223	enmType = CFGTOKENTYPE_EOF;
224	rc = VINF_SUCCESS;
225	break;
226	}
227	else if (RT_FAILURE(rc))
228	break;
229	/* start from the beginning. */
230	cchAdvance = 0;
231	}
232	else if (*pszToken == '=')
233	{
234	enmType = CFGTOKENTYPE_EQUAL;
235	break;
236	}
237	else if (*pszToken == ',')
238	{
239	enmType = CFGTOKENTYPE_COMMA;
240	break;
241	}
242	else if (*pszToken == '{')
243	{
244	enmType = CFGTOKENTYPE_CURLY_OPEN;
245	break;
246	}
247	else if (*pszToken == '}')
248	{
249	enmType = CFGTOKENTYPE_CURLY_CLOSING;
250	break;
251	}
252	else
253	{
254	const char *pszTmp = pszToken;
255	cchToken = 0;
256	enmType = CFGTOKENTYPE_ID;
257
258	/* Get the complete token. */
259	while ( RT_C_IS_ALNUM(*pszTmp)
260	\|\| *pszTmp == '_'
261	\|\| *pszTmp == '.')
262	{
263	pszTmp++;
264	cchToken++;
265	}
266	break;
267	}
268	}
269
270	Assert(RT_FAILURE(rc) \|\| enmType != CFGTOKENTYPE_INVALID);
271
272	if (RT_SUCCESS(rc))
273	{
274	/* Free the given token if it is an ID or the current one is an ID token. */
275	if ( pCfgTokenUse
276	&& ( pCfgTokenUse->enmType == CFGTOKENTYPE_ID
277	\|\| enmType == CFGTOKENTYPE_ID))
278	{
279	autostartConfigTokenFree(pCfgTokenizer, pCfgTokenUse);
280	pCfgTokenUse = NULL;
281	}
282
283	if (!pCfgTokenUse)
284	{
285	size_t cbToken = sizeof(CFGTOKEN);
286	if (enmType == CFGTOKENTYPE_ID)
287	cbToken += (cchToken + 1) * sizeof(char);
288
289	pCfgTokenUse = (PCFGTOKEN)RTMemAllocZ(cbToken);
290	if (!pCfgTokenUse)
291	rc = VERR_NO_MEMORY;
292	}
293
294	if (RT_SUCCESS(rc))
295	{
296	/* Copy token data. */
297	pCfgTokenUse->enmType = enmType;
298	pCfgTokenUse->cchStart = pCfgTokenizer->cchCurr;
299	pCfgTokenUse->iLine = pCfgTokenizer->iLine;
300	if (enmType == CFGTOKENTYPE_ID)
301	{
302	pCfgTokenUse->u.Id.cchToken = cchToken;
303	memcpy(pCfgTokenUse->u.Id.achToken, pszToken, cchToken);
304	}
305	}
306	else if (pCfgTokenUse)
307	autostartConfigTokenFree(pCfgTokenizer, pCfgTokenUse);
308
309	if (RT_SUCCESS(rc))
310	{
311	/* Set new position in config stream. */
312	pCfgTokenizer->pszLineCurr += cchToken + cchAdvance;
313	pCfgTokenizer->cchCurr += cchToken + cchAdvance;
314	*ppCfgToken = pCfgTokenUse;
315	}
316	}
317
318	return rc;
319	}
320
321	/**
322	* Destroys the given config tokenizer.
323	*
324	* @returns nothing.
325	* @param pCfgTokenizer The config tokenizer to destroy.
326	*/
327	static void autostartConfigTokenizerDestroy(PCFGTOKENIZER pCfgTokenizer)
328	{
329	if (pCfgTokenizer->pszLine)
330	RTMemFree(pCfgTokenizer->pszLine);
331	if (pCfgTokenizer->hStrmConfig)
332	RTStrmClose(pCfgTokenizer->hStrmConfig);
333	if (pCfgTokenizer->pTokenNext)
334	RTMemFree(pCfgTokenizer->pTokenNext);
335	RTMemFree(pCfgTokenizer);
336	}
337
338	/**
339	* Creates the config tokenizer from the given filename.
340	*
341	* @returns VBox status code.
342	* @param pszFilename Config filename.
343	* @param ppCfgTokenizer Where to store the pointer to the config tokenizer on
344	* success.
345	*/
346	static int autostartConfigTokenizerCreate(const char pszFilename, PCFGTOKENIZER ppCfgTokenizer)
347	{
348	int rc = VINF_SUCCESS;
349	PCFGTOKENIZER pCfgTokenizer = (PCFGTOKENIZER)RTMemAllocZ(sizeof(CFGTOKENIZER));
350
351	if (pCfgTokenizer)
352	{
353	pCfgTokenizer->iLine = 0;
354	pCfgTokenizer->cbLine = 128;
355	pCfgTokenizer->pszLine = (char *)RTMemAllocZ(pCfgTokenizer->cbLine);
356	if (pCfgTokenizer->pszLine)
357	{
358	rc = RTStrmOpen(pszFilename, "r", &pCfgTokenizer->hStrmConfig);
359	if (RT_SUCCESS(rc))
360	{
361	rc = autostartConfigTokenizerReadNextLine(pCfgTokenizer);
362	if (RT_SUCCESS(rc))
363	rc = autostartConfigTokenizerCreateToken(pCfgTokenizer, NULL,
364	&pCfgTokenizer->pTokenNext);
365	}
366	}
367	else
368	rc = VERR_NO_MEMORY;
369	}
370	else
371	rc = VERR_NO_MEMORY;
372
373	if (RT_SUCCESS(rc))
374	*ppCfgTokenizer = pCfgTokenizer;
375	else if ( RT_FAILURE(rc)
376	&& pCfgTokenizer)
377	autostartConfigTokenizerDestroy(pCfgTokenizer);
378
379	return rc;
380	}
381
382	/**
383	* Return the next token from the config stream.
384	*
385	* @returns VBox status code.
386	* @param pCfgTokenizer The config tokenizer.
387	* @param ppCfgToken Where to store the next token.
388	*/
389	static int autostartConfigTokenizerGetNextToken(PCFGTOKENIZER pCfgTokenizer,
390	PCFGTOKEN *ppCfgToken)
391	{
392	*ppCfgToken = pCfgTokenizer->pTokenNext;
393	return autostartConfigTokenizerCreateToken(pCfgTokenizer, NULL, &pCfgTokenizer->pTokenNext);
394	}
395
396	/**
397	* Returns a stringified version of the token type.
398	*
399	* @returns Stringified version of the token type.
400	* @param enmType Token type.
401	*/
402	static const char *autostartConfigTokenTypeToStr(CFGTOKENTYPE enmType)
403	{
404	switch (enmType)
405	{
406	case CFGTOKENTYPE_COMMA:
407	return ",";
408	case CFGTOKENTYPE_EQUAL:
409	return "=";
410	case CFGTOKENTYPE_CURLY_OPEN:
411	return "{";
412	case CFGTOKENTYPE_CURLY_CLOSING:
413	return "}";
414	case CFGTOKENTYPE_EOF:
415	return "<EOF>";
416	case CFGTOKENTYPE_ID:
417	return "<Identifier>";
418	default:
419	AssertFailed();
420	return "<Invalid>";
421	}
422	/* not reached */
423	}
424
425	/**
426	* Returns a stringified version of the token.
427	*
428	* @returns Stringified version of the token type.
429	* @param pToken Token.
430	*/
431	static const char *autostartConfigTokenToString(PCFGTOKEN pToken)
432	{
433	if (pToken->enmType == CFGTOKENTYPE_ID)
434	return pToken->u.Id.achToken;
435	else
436	return autostartConfigTokenTypeToStr(pToken->enmType);
437	}
438
439	/**
440	* Returns the length of the token in characters (without zero terminator).
441	*
442	* @returns Token length.
443	* @param pToken Token.
444	*/
445	static size_t autostartConfigTokenGetLength(PCFGTOKEN pToken)
446	{
447	switch (pToken->enmType)
448	{
449	case CFGTOKENTYPE_COMMA:
450	case CFGTOKENTYPE_EQUAL:
451	case CFGTOKENTYPE_CURLY_OPEN:
452	case CFGTOKENTYPE_CURLY_CLOSING:
453	return 1;
454	case CFGTOKENTYPE_EOF:
455	return 0;
456	case CFGTOKENTYPE_ID:
457	return strlen(pToken->u.Id.achToken);
458	default:
459	AssertFailed();
460	return 0;
461	}
462	/* not reached */
463	}
464
465	/**
466	* Log unexpected token error.
467	*
468	* @returns VBox status code (VERR_INVALID_PARAMETER).
469	* @param pToken The token which caused the error.
470	* @param pszExpected String of the token which was expected.
471	*/
472	static int autostartConfigTokenizerMsgUnexpectedToken(PCFGTOKEN pToken, const char *pszExpected)
473	{
474	return autostartSvcLogErrorRc(VERR_INVALID_PARAMETER, "Unexpected token '%s' at %d:%d.%d, expected '%s'",
475	autostartConfigTokenToString(pToken),
476	pToken->iLine, pToken->cchStart,
477	pToken->cchStart + autostartConfigTokenGetLength(pToken) - 1, pszExpected);
478	}
479
480	/**
481	* Verfies a token and consumes it.
482	*
483	* @returns VBox status code.
484	* @param pCfgTokenizer The config tokenizer.
485	* @param pszTokenCheck The token to check for.
486	*/
487	static int autostartConfigTokenizerCheckAndConsume(PCFGTOKENIZER pCfgTokenizer, CFGTOKENTYPE enmType)
488	{
489	int rc = VINF_SUCCESS;
490	PCFGTOKEN pCfgToken = NULL;
491
492	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pCfgToken);
493	if (RT_SUCCESS(rc))
494	{
495	if (pCfgToken->enmType != enmType)
496	return autostartConfigTokenizerMsgUnexpectedToken(pCfgToken, autostartConfigTokenTypeToStr(enmType));
497
498	autostartConfigTokenFree(pCfgTokenizer, pCfgToken);
499	}
500	return rc;
501	}
502
503	/**
504	* Consumes the next token in the stream.
505	*
506	* @returns VBox status code.
507	* @param pCfgTokenizer Tokenizer instance data.
508	*/
509	static int autostartConfigTokenizerConsume(PCFGTOKENIZER pCfgTokenizer)
510	{
511	int rc = VINF_SUCCESS;
512	PCFGTOKEN pCfgToken = NULL;
513
514	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pCfgToken);
515	if (RT_SUCCESS(rc))
516	autostartConfigTokenFree(pCfgTokenizer, pCfgToken);
517
518	return rc;
519	}
520
521	/**
522	* Returns the start of the next token without consuming it.
523	*
524	* @returns The next token without consuming it.
525	* @param pCfgTokenizer Tokenizer instance data.
526	*/
527	DECLINLINE(PCFGTOKEN) autostartConfigTokenizerPeek(PCFGTOKENIZER pCfgTokenizer)
528	{
529	return pCfgTokenizer->pTokenNext;
530	}
531
532	/**
533	* Check whether the next token is equal to the given one.
534	*
535	* @returns true if the next token in the stream is equal to the given one
536	* false otherwise.
537	* @param pszToken The token to check for.
538	*/
539	DECLINLINE(bool) autostartConfigTokenizerPeekIsEqual(PCFGTOKENIZER pCfgTokenizer, CFGTOKENTYPE enmType)
540	{
541	PCFGTOKEN pToken = autostartConfigTokenizerPeek(pCfgTokenizer);
542	return pToken->enmType == enmType;
543	}
544
545	/**
546	* Parse a key value node and returns the AST.
547	*
548	* @returns VBox status code.
549	* @param pCfgTokenizer The tokenizer for the config stream.
550	* @param pszKey The key for the pair.
551	* @param ppCfgAst Where to store the resulting AST on success.
552	*/
553	static int autostartConfigParseValue(PCFGTOKENIZER pCfgTokenizer, const char *pszKey,
554	PCFGAST *ppCfgAst)
555	{
556	int rc = VINF_SUCCESS;
557	PCFGTOKEN pToken = NULL;
558
559	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pToken);
560	if ( RT_SUCCESS(rc)
561	&& pToken->enmType == CFGTOKENTYPE_ID)
562	{
563	PCFGAST pCfgAst = NULL;
564
565	pCfgAst = (PCFGAST)RTMemAllocZ(RT_UOFFSETOF_DYN(CFGAST, u.KeyValue.aszValue[pToken->u.Id.cchToken + 1]));
566	if (!pCfgAst)
567	return VERR_NO_MEMORY;
568
569	pCfgAst->enmType = CFGASTNODETYPE_KEYVALUE;
570	pCfgAst->pszKey = RTStrDup(pszKey);
571	if (!pCfgAst->pszKey)
572	{
573	RTMemFree(pCfgAst);
574	return VERR_NO_MEMORY;
575	}
576
577	memcpy(pCfgAst->u.KeyValue.aszValue, pToken->u.Id.achToken, pToken->u.Id.cchToken);
578	pCfgAst->u.KeyValue.cchValue = pToken->u.Id.cchToken;
579	*ppCfgAst = pCfgAst;
580	}
581	else
582	rc = autostartConfigTokenizerMsgUnexpectedToken(pToken, "non reserved token");
583
584	return rc;
585	}
586
587	/**
588	* Parses a compound node constructing the AST and returning it on success.
589	*
590	* @returns VBox status code.
591	* @param pCfgTokenizer The tokenizer for the config stream.
592	* @param pszScopeId The scope ID of the compound node.
593	* @param ppCfgAst Where to store the resulting AST on success.
594	*/
595	static int autostartConfigParseCompoundNode(PCFGTOKENIZER pCfgTokenizer, const char *pszScopeId,
596	PCFGAST *ppCfgAst)
597	{
598	unsigned cAstNodesMax = 10;
599	PCFGAST pCfgAst = (PCFGAST)RTMemAllocZ(RT_UOFFSETOF_DYN(CFGAST, u.Compound.apAstNodes[cAstNodesMax]));
600	if (!pCfgAst)
601	return VERR_NO_MEMORY;
602
603	pCfgAst->enmType = CFGASTNODETYPE_COMPOUND;
604	pCfgAst->u.Compound.cAstNodes = 0;
605	pCfgAst->pszKey = RTStrDup(pszScopeId);
606	if (!pCfgAst->pszKey)
607	{
608	RTMemFree(pCfgAst);
609	return VERR_NO_MEMORY;
610	}
611
612	int rc = VINF_SUCCESS;
613	do
614	{
615	PCFGTOKEN pToken = NULL;
616	PCFGAST pAstNode = NULL;
617
618	if ( autostartConfigTokenizerPeekIsEqual(pCfgTokenizer, CFGTOKENTYPE_CURLY_CLOSING)
619	\|\| autostartConfigTokenizerPeekIsEqual(pCfgTokenizer, CFGTOKENTYPE_EOF))
620	break;
621
622	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pToken);
623	if ( RT_SUCCESS(rc)
624	&& pToken->enmType == CFGTOKENTYPE_ID)
625	{
626	/* Next must be a = token in all cases at this place. */
627	rc = autostartConfigTokenizerCheckAndConsume(pCfgTokenizer, CFGTOKENTYPE_EQUAL);
628	if (RT_SUCCESS(rc))
629	{
630	/* Check whether this is a compound node. */
631	if (autostartConfigTokenizerPeekIsEqual(pCfgTokenizer, CFGTOKENTYPE_CURLY_OPEN))
632	{
633	rc = autostartConfigTokenizerConsume(pCfgTokenizer);
634	if (RT_SUCCESS(rc))
635	rc = autostartConfigParseCompoundNode(pCfgTokenizer, pToken->u.Id.achToken,
636	&pAstNode);
637
638	if (RT_SUCCESS(rc))
639	rc = autostartConfigTokenizerCheckAndConsume(pCfgTokenizer, CFGTOKENTYPE_CURLY_CLOSING);
640	}
641	else
642	rc = autostartConfigParseValue(pCfgTokenizer, pToken->u.Id.achToken,
643	&pAstNode);
644	}
645	}
646	else if (RT_SUCCESS(rc))
647	rc = autostartConfigTokenizerMsgUnexpectedToken(pToken, "non reserved token");
648
649	/* Add to the current compound node. */
650	if (RT_SUCCESS(rc))
651	{
652	if (pCfgAst->u.Compound.cAstNodes >= cAstNodesMax)
653	{
654	cAstNodesMax += 10;
655
656	PCFGAST pCfgAstNew = (PCFGAST)RTMemRealloc(pCfgAst, RT_UOFFSETOF_DYN(CFGAST, u.Compound.apAstNodes[cAstNodesMax]));
657	if (!pCfgAstNew)
658	rc = VERR_NO_MEMORY;
659	else
660	pCfgAst = pCfgAstNew;
661	}
662
663	if (RT_SUCCESS(rc))
664	{
665	pCfgAst->u.Compound.apAstNodes[pCfgAst->u.Compound.cAstNodes] = pAstNode;
666	pCfgAst->u.Compound.cAstNodes++;
667	}
668	}
669
670	autostartConfigTokenFree(pCfgTokenizer, pToken);
671
672	} while (RT_SUCCESS(rc));
673
674	if (RT_SUCCESS(rc))
675	*ppCfgAst = pCfgAst;
676	else
677	autostartConfigAstDestroy(pCfgAst);
678
679	return rc;
680	}
681
682	DECLHIDDEN(int) autostartParseConfig(const char pszFilename, PCFGAST ppCfgAst)
683	{
684	PCFGTOKENIZER pCfgTokenizer = NULL;
685	int rc = VINF_SUCCESS;
686	PCFGAST pCfgAst = NULL;
687
688	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
689	AssertPtrReturn(ppCfgAst, VERR_INVALID_POINTER);
690
691	rc = autostartConfigTokenizerCreate(pszFilename, &pCfgTokenizer);
692	if (RT_SUCCESS(rc))
693	{
694	rc = autostartConfigParseCompoundNode(pCfgTokenizer, "", &pCfgAst);
695	if (RT_SUCCESS(rc))
696	rc = autostartConfigTokenizerCheckAndConsume(pCfgTokenizer, CFGTOKENTYPE_EOF);
697	}
698
699	if (pCfgTokenizer)
700	autostartConfigTokenizerDestroy(pCfgTokenizer);
701
702	if (RT_SUCCESS(rc))
703	*ppCfgAst = pCfgAst;
704
705	return rc;
706	}
707
708	DECLHIDDEN(void) autostartConfigAstDestroy(PCFGAST pCfgAst)
709	{
710	AssertPtrReturnVoid(pCfgAst);
711
712	switch (pCfgAst->enmType)
713	{
714	case CFGASTNODETYPE_KEYVALUE:
715	{
716	RTMemFree(pCfgAst);
717	break;
718	}
719	case CFGASTNODETYPE_COMPOUND:
720	{
721	for (unsigned i = 0; i < pCfgAst->u.Compound.cAstNodes; i++)
722	autostartConfigAstDestroy(pCfgAst->u.Compound.apAstNodes[i]);
723	RTMemFree(pCfgAst);
724	break;
725	}
726	case CFGASTNODETYPE_LIST:
727	RT_FALL_THROUGH();
728	default:
729	AssertMsgFailed(("Invalid AST node type %d\n", pCfgAst->enmType));
730	}
731	}
732
733	DECLHIDDEN(PCFGAST) autostartConfigAstGetByName(PCFGAST pCfgAst, const char *pszName)
734	{
735	if (!pCfgAst)
736	return NULL;
737
738	AssertReturn(pCfgAst->enmType == CFGASTNODETYPE_COMPOUND, NULL);
739
740	for (unsigned i = 0; i < pCfgAst->u.Compound.cAstNodes; i++)
741	{
742	PCFGAST pNode = pCfgAst->u.Compound.apAstNodes[i];
743
744	if (!RTStrCmp(pNode->pszKey, pszName))
745	return pNode;
746	}
747
748	return NULL;
749	}
750

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source: vbox/trunk/src/VBox/Frontends/VBoxAutostart/VBoxAutostartCfg.cpp@ 97698

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