VBoxAutostartCfg.cpp@ 48458

Last change on this file since 48458 was 46737, checked in by vboxsync, 11 years ago
FE/VBoxAutostart: Todos and comments
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1	/* $Id: VBoxAutostartCfg.cpp 46737 2013-06-23 12:11:45Z vboxsync $ */
2	/** @file
3	* VBoxAutostart - VirtualBox Autostart service, configuration parser.
4	*/
5
6	/*
7	* Copyright (C) 2012 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21
22	#include <iprt/stream.h>
23	#include <iprt/process.h>
24	#include <iprt/string.h>
25	#include <iprt/mem.h>
26	#include <iprt/ctype.h>
27	#include <iprt/message.h>
28
29	#include "VBoxAutostart.h"
30
31	/*******************************************************************************
32	* Constants And Macros, Structures and Typedefs *
33	*******************************************************************************/
34
35	/**
36	* Token type.
37	*/
38	typedef enum CFGTOKENTYPE
39	{
40	/** Invalid token type. */
41	CFGTOKENTYPE_INVALID = 0,
42	/** Identifier. */
43	CFGTOKENTYPE_ID,
44	/** Comma. */
45	CFGTOKENTYPE_COMMA,
46	/** Equal sign. */
47	CFGTOKENTYPE_EQUAL,
48	/** Open curly brackets. */
49	CFGTOKENTYPE_CURLY_OPEN,
50	/** Closing curly brackets. */
51	CFGTOKENTYPE_CURLY_CLOSING,
52	/** End of file. */
53	CFGTOKENTYPE_EOF,
54	/** 32bit hack. */
55	CFGTOKENTYPE_32BIT_HACK = 0x7fffffff
56	} CFGTOKENTYPE;
57	/** Pointer to a token type. */
58	typedef CFGTOKENTYPE *PCFGTOKENTYPE;
59	/** Pointer to a const token type. */
60	typedef const CFGTOKENTYPE *PCCFGTOKENTYPE;
61
62	/**
63	* A token.
64	*/
65	typedef struct CFGTOKEN
66	{
67	/** Type of the token. */
68	CFGTOKENTYPE enmType;
69	/** Line number of the token. */
70	unsigned iLine;
71	/** Starting character of the token in the stream. */
72	unsigned cchStart;
73	/** Type dependen token data. */
74	union
75	{
76	/** Data for the ID type. */
77	struct
78	{
79	/** Size of the id in characters, excluding the \0 terminator. */
80	size_t cchToken;
81	/** Token data, variable size (given by cchToken member). */
82	char achToken[1];
83	} Id;
84	} u;
85	} CFGTOKEN;
86	/** Pointer to a token. */
87	typedef CFGTOKEN *PCFGTOKEN;
88	/** Pointer to a const token. */
89	typedef const CFGTOKEN *PCCFGTOKEN;
90
91	/**
92	* Tokenizer instance data for the config data.
93	*/
94	typedef struct CFGTOKENIZER
95	{
96	/** Config file handle. */
97	PRTSTREAM hStrmConfig;
98	/** String buffer for the current line we are operating in. */
99	char *pszLine;
100	/** Size of the string buffer. */
101	size_t cbLine;
102	/** Current position in the line. */
103	char *pszLineCurr;
104	/** Current line in the config file. */
105	unsigned iLine;
106	/** Current character of the line. */
107	unsigned cchCurr;
108	/** Flag whether the end of the config stream is reached. */
109	bool fEof;
110	/** Pointer to the next token in the stream (used to peek). */
111	PCFGTOKEN pTokenNext;
112	} CFGTOKENIZER, *PCFGTOKENIZER;
113
114	/*******************************************************************************
115	* Internal Functions *
116	*******************************************************************************/
117
118	/**
119	* Free a config token.
120	*
121	* @returns nothing.
122	* @param pCfgTokenizer The config tokenizer.
123	* @param pToken The token to free.
124	*/
125	static void autostartConfigTokenFree(PCFGTOKENIZER pCfgTokenizer, PCFGTOKEN pToken)
126	{
127	NOREF(pCfgTokenizer);
128	RTMemFree(pToken);
129	}
130
131	/**
132	* Reads the next line from the config stream.
133	*
134	* @returns VBox status code.
135	* @param pCfgTokenizer The config tokenizer.
136	*/
137	static int autostartConfigTokenizerReadNextLine(PCFGTOKENIZER pCfgTokenizer)
138	{
139	int rc = VINF_SUCCESS;
140
141	if (pCfgTokenizer->fEof)
142	return VERR_EOF;
143
144	do
145	{
146	rc = RTStrmGetLine(pCfgTokenizer->hStrmConfig, pCfgTokenizer->pszLine,
147	pCfgTokenizer->cbLine);
148	if (rc == VERR_BUFFER_OVERFLOW)
149	{
150	char *pszTmp;
151
152	pCfgTokenizer->cbLine += 128;
153	pszTmp = (char *)RTMemRealloc(pCfgTokenizer->pszLine, pCfgTokenizer->cbLine);
154	if (pszTmp)
155	pCfgTokenizer->pszLine = pszTmp;
156	else
157	rc = VERR_NO_MEMORY;
158	}
159	} while (rc == VERR_BUFFER_OVERFLOW);
160
161	if ( RT_SUCCESS(rc)
162	\|\| rc == VERR_EOF)
163	{
164	pCfgTokenizer->iLine++;
165	pCfgTokenizer->cchCurr = 1;
166	pCfgTokenizer->pszLineCurr = pCfgTokenizer->pszLine;
167	if (rc == VERR_EOF)
168	pCfgTokenizer->fEof = true;
169	}
170
171	return rc;
172	}
173
174	/**
175	* Get the next token from the config stream and create a token structure.
176	*
177	* @returns VBox status code.
178	* @param pCfgTokenizer The config tokenizer data.
179	* @param pCfgTokenUse Allocated token structure to use or NULL to allocate
180	* a new one. It will bee freed if an error is encountered.
181	* @param ppCfgToken Where to store the pointer to the next token on success.
182	*/
183	static int autostartConfigTokenizerCreateToken(PCFGTOKENIZER pCfgTokenizer,
184	PCFGTOKEN pCfgTokenUse, PCFGTOKEN *ppCfgToken)
185	{
186	const char *pszToken = NULL;
187	size_t cchToken = 1;
188	size_t cchAdvance = 0;
189	CFGTOKENTYPE enmType = CFGTOKENTYPE_INVALID;
190	int rc = VINF_SUCCESS;
191
192	for (;;)
193	{
194	pszToken = pCfgTokenizer->pszLineCurr;
195
196	/* Skip all spaces. */
197	while (RT_C_IS_BLANK(*pszToken))
198	{
199	pszToken++;
200	cchAdvance++;
201	}
202
203	/* Check if we have to read a new line. */
204	if ( *pszToken == '\0'
205	\|\| *pszToken == '#')
206	{
207	rc = autostartConfigTokenizerReadNextLine(pCfgTokenizer);
208	if (rc == VERR_EOF)
209	{
210	enmType = CFGTOKENTYPE_EOF;
211	rc = VINF_SUCCESS;
212	break;
213	}
214	else if (RT_FAILURE(rc))
215	break;
216	/* start from the beginning. */
217	cchAdvance = 0;
218	}
219	else if (*pszToken == '=')
220	{
221	enmType = CFGTOKENTYPE_EQUAL;
222	break;
223	}
224	else if (*pszToken == ',')
225	{
226	enmType = CFGTOKENTYPE_COMMA;
227	break;
228	}
229	else if (*pszToken == '{')
230	{
231	enmType = CFGTOKENTYPE_CURLY_OPEN;
232	break;
233	}
234	else if (*pszToken == '}')
235	{
236	enmType = CFGTOKENTYPE_CURLY_CLOSING;
237	break;
238	}
239	else
240	{
241	const char *pszTmp = pszToken;
242	cchToken = 0;
243	enmType = CFGTOKENTYPE_ID;
244
245	/* Get the complete token. */
246	while ( RT_C_IS_ALNUM(*pszTmp)
247	\|\| *pszTmp == '_'
248	\|\| *pszTmp == '.')
249	{
250	pszTmp++;
251	cchToken++;
252	}
253	break;
254	}
255	}
256
257	Assert(RT_FAILURE(rc) \|\| enmType != CFGTOKENTYPE_INVALID);
258
259	if (RT_SUCCESS(rc))
260	{
261	/* Free the given token if it is an ID or the current one is an ID token. */
262	if ( pCfgTokenUse
263	&& ( pCfgTokenUse->enmType == CFGTOKENTYPE_ID
264	\|\| enmType == CFGTOKENTYPE_ID))
265	{
266	autostartConfigTokenFree(pCfgTokenizer, pCfgTokenUse);
267	pCfgTokenUse = NULL;
268	}
269
270	if (!pCfgTokenUse)
271	{
272	size_t cbToken = sizeof(CFGTOKEN);
273	if (enmType == CFGTOKENTYPE_ID)
274	cbToken += (cchToken + 1) * sizeof(char);
275
276	pCfgTokenUse = (PCFGTOKEN)RTMemAllocZ(cbToken);
277	if (!pCfgTokenUse)
278	rc = VERR_NO_MEMORY;
279	}
280
281	if (RT_SUCCESS(rc))
282	{
283	/* Copy token data. */
284	pCfgTokenUse->enmType = enmType;
285	pCfgTokenUse->cchStart = pCfgTokenizer->cchCurr;
286	pCfgTokenUse->iLine = pCfgTokenizer->iLine;
287	if (enmType == CFGTOKENTYPE_ID)
288	{
289	pCfgTokenUse->u.Id.cchToken = cchToken;
290	memcpy(pCfgTokenUse->u.Id.achToken, pszToken, cchToken);
291	}
292	}
293	else if (pCfgTokenUse)
294	autostartConfigTokenFree(pCfgTokenizer, pCfgTokenUse);
295
296	if (RT_SUCCESS(rc))
297	{
298	/* Set new position in config stream. */
299	pCfgTokenizer->pszLineCurr += cchToken + cchAdvance;
300	pCfgTokenizer->cchCurr += cchToken + cchAdvance;
301	*ppCfgToken = pCfgTokenUse;
302	}
303	}
304
305	return rc;
306	}
307
308	/**
309	* Destroys the given config tokenizer.
310	*
311	* @returns nothing.
312	* @param pCfgTokenizer The config tokenizer to destroy.
313	*/
314	static void autostartConfigTokenizerDestroy(PCFGTOKENIZER pCfgTokenizer)
315	{
316	if (pCfgTokenizer->pszLine)
317	RTMemFree(pCfgTokenizer->pszLine);
318	if (pCfgTokenizer->hStrmConfig)
319	RTStrmClose(pCfgTokenizer->hStrmConfig);
320	if (pCfgTokenizer->pTokenNext)
321	RTMemFree(pCfgTokenizer->pTokenNext);
322	RTMemFree(pCfgTokenizer);
323	}
324
325	/**
326	* Creates the config tokenizer from the given filename.
327	*
328	* @returns VBox status code.
329	* @param pszFilename Config filename.
330	* @param ppCfgTokenizer Where to store the pointer to the config tokenizer on
331	* success.
332	*/
333	static int autostartConfigTokenizerCreate(const char pszFilename, PCFGTOKENIZER ppCfgTokenizer)
334	{
335	int rc = VINF_SUCCESS;
336	PCFGTOKENIZER pCfgTokenizer = (PCFGTOKENIZER)RTMemAllocZ(sizeof(CFGTOKENIZER));
337
338	if (pCfgTokenizer)
339	{
340	pCfgTokenizer->iLine = 0;
341	pCfgTokenizer->cbLine = 128;
342	pCfgTokenizer->pszLine = (char *)RTMemAllocZ(pCfgTokenizer->cbLine);
343	if (pCfgTokenizer->pszLine)
344	{
345	rc = RTStrmOpen(pszFilename, "r", &pCfgTokenizer->hStrmConfig);
346	if (RT_SUCCESS(rc))
347	{
348	rc = autostartConfigTokenizerReadNextLine(pCfgTokenizer);
349	if (RT_SUCCESS(rc))
350	rc = autostartConfigTokenizerCreateToken(pCfgTokenizer, NULL,
351	&pCfgTokenizer->pTokenNext);
352	}
353	}
354	else
355	rc = VERR_NO_MEMORY;
356	}
357	else
358	rc = VERR_NO_MEMORY;
359
360	if (RT_SUCCESS(rc))
361	*ppCfgTokenizer = pCfgTokenizer;
362	else if ( RT_FAILURE(rc)
363	&& pCfgTokenizer)
364	autostartConfigTokenizerDestroy(pCfgTokenizer);
365
366	return rc;
367	}
368
369	/**
370	* Return the next token from the config stream.
371	*
372	* @returns VBox status code.
373	* @param pCfgTokenizer The config tokenizer.
374	* @param ppCfgToken Where to store the next token.
375	*/
376	static int autostartConfigTokenizerGetNextToken(PCFGTOKENIZER pCfgTokenizer,
377	PCFGTOKEN *ppCfgToken)
378	{
379	*ppCfgToken = pCfgTokenizer->pTokenNext;
380	return autostartConfigTokenizerCreateToken(pCfgTokenizer, NULL, &pCfgTokenizer->pTokenNext);
381	}
382
383	/**
384	* Returns a stringified version of the token type.
385	*
386	* @returns Stringified version of the token type.
387	* @param enmType Token type.
388	*/
389	static const char *autostartConfigTokenTypeToStr(CFGTOKENTYPE enmType)
390	{
391	switch (enmType)
392	{
393	case CFGTOKENTYPE_COMMA:
394	return ",";
395	case CFGTOKENTYPE_EQUAL:
396	return "=";
397	case CFGTOKENTYPE_CURLY_OPEN:
398	return "{";
399	case CFGTOKENTYPE_CURLY_CLOSING:
400	return "}";
401	case CFGTOKENTYPE_EOF:
402	return "<EOF>";
403	case CFGTOKENTYPE_ID:
404	return "<Identifier>";
405	default:
406	AssertFailed();
407	return "<Invalid>";
408	}
409
410	AssertFailed();
411	return NULL;
412	}
413
414	/**
415	* Returns a stringified version of the token.
416	*
417	* @returns Stringified version of the token type.
418	* @param pToken Token.
419	*/
420	static const char *autostartConfigTokenToString(PCFGTOKEN pToken)
421	{
422	if (pToken->enmType == CFGTOKENTYPE_ID)
423	return pToken->u.Id.achToken;
424	else
425	return autostartConfigTokenTypeToStr(pToken->enmType);
426	}
427
428	/**
429	* Returns the length of the token in characters (without zero terminator).
430	*
431	* @returns Token length.
432	* @param pToken Token.
433	*/
434	static size_t autostartConfigTokenGetLength(PCFGTOKEN pToken)
435	{
436	switch (pToken->enmType)
437	{
438	case CFGTOKENTYPE_COMMA:
439	case CFGTOKENTYPE_EQUAL:
440	case CFGTOKENTYPE_CURLY_OPEN:
441	case CFGTOKENTYPE_CURLY_CLOSING:
442	return 1;
443	case CFGTOKENTYPE_EOF:
444	return 0;
445	case CFGTOKENTYPE_ID:
446	return strlen(pToken->u.Id.achToken);
447	default:
448	AssertFailed();
449	return 0;
450	}
451
452	AssertFailed();
453	return 0;
454	}
455
456	/**
457	* Log unexpected token error.
458	*
459	* @returns nothing.
460	* @param pToken The token which caused the error.
461	* @param pszExpected String of the token which was expected.
462	*/
463	static void autostartConfigTokenizerMsgUnexpectedToken(PCFGTOKEN pToken, const char *pszExpected)
464	{
465	autostartSvcLogError("Unexpected token '%s' at %d:%d.%d, expected '%s'",
466	autostartConfigTokenToString(pToken),
467	pToken->iLine, pToken->cchStart,
468	pToken->cchStart + autostartConfigTokenGetLength(pToken) - 1, pszExpected);
469	}
470
471	/**
472	* Verfies a token and consumes it.
473	*
474	* @returns VBox status code.
475	* @param pCfgTokenizer The config tokenizer.
476	* @param pszTokenCheck The token to check for.
477	*/
478	static int autostartConfigTokenizerCheckAndConsume(PCFGTOKENIZER pCfgTokenizer, CFGTOKENTYPE enmType)
479	{
480	int rc = VINF_SUCCESS;
481	PCFGTOKEN pCfgToken = NULL;
482
483	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pCfgToken);
484	if (RT_SUCCESS(rc))
485	{
486	if (pCfgToken->enmType != enmType)
487	{
488	autostartConfigTokenizerMsgUnexpectedToken(pCfgToken, autostartConfigTokenTypeToStr(enmType));
489	rc = VERR_INVALID_PARAMETER;
490	}
491
492	autostartConfigTokenFree(pCfgTokenizer, pCfgToken);
493	}
494	return rc;
495	}
496
497	/**
498	* Consumes the next token in the stream.
499	*
500	* @returns VBox status code.
501	* @param pCfgTokenizer Tokenizer instance data.
502	*/
503	static int autostartConfigTokenizerConsume(PCFGTOKENIZER pCfgTokenizer)
504	{
505	int rc = VINF_SUCCESS;
506	PCFGTOKEN pCfgToken = NULL;
507
508	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pCfgToken);
509	if (RT_SUCCESS(rc))
510	autostartConfigTokenFree(pCfgTokenizer, pCfgToken);
511
512	return rc;
513	}
514
515	/**
516	* Returns the start of the next token without consuming it.
517	*
518	* @returns The next token without consuming it.
519	* @param pCfgTokenizer Tokenizer instance data.
520	*/
521	DECLINLINE(PCFGTOKEN) autostartConfigTokenizerPeek(PCFGTOKENIZER pCfgTokenizer)
522	{
523	return pCfgTokenizer->pTokenNext;
524	}
525
526	/**
527	* Check whether the next token is equal to the given one.
528	*
529	* @returns true if the next token in the stream is equal to the given one
530	* false otherwise.
531	* @param pszToken The token to check for.
532	*/
533	DECLINLINE(bool) autostartConfigTokenizerPeekIsEqual(PCFGTOKENIZER pCfgTokenizer, CFGTOKENTYPE enmType)
534	{
535	PCFGTOKEN pToken = autostartConfigTokenizerPeek(pCfgTokenizer);
536	return pToken->enmType == enmType;
537	}
538
539	/**
540	* Parse a key value node and returns the AST.
541	*
542	* @returns VBox status code.
543	* @param pCfgTokenizer The tokenizer for the config stream.
544	* @param pszKey The key for the pair.
545	* @param ppCfgAst Where to store the resulting AST on success.
546	*/
547	static int autostartConfigParseValue(PCFGTOKENIZER pCfgTokenizer, const char *pszKey,
548	PCFGAST *ppCfgAst)
549	{
550	int rc = VINF_SUCCESS;
551	PCFGTOKEN pToken = NULL;
552
553	rc = autostartConfigTokenizerGetNextToken(pCfgTokenizer, &pToken);
554	if ( RT_SUCCESS(rc)
555	&& pToken->enmType == CFGTOKENTYPE_ID)
556	{
557	PCFGAST pCfgAst = NULL;
558
559	pCfgAst = (PCFGAST)RTMemAllocZ(RT_OFFSETOF(CFGAST, u.KeyValue.aszValue[pToken->u.Id.cchToken + 1]));
560	if (!pCfgAst)
561	return VERR_NO_MEMORY;
562
563	pCfgAst->enmType = CFGASTNODETYPE_KEYVALUE;
564	pCfgAst->pszKey = RTStrDup(pszKey);
565	if (!pCfgAst->pszKey)
566	{
567	RTMemFree(pCfgAst);
568	return VERR_NO_MEMORY;
569	}
570
571	memcpy(pCfgAst->u.KeyValue.aszValue, pToken->u.Id.achToken, pToken->u.Id.cchToken);
572	pCfgAst->u.KeyValue.cchValue = pToken->u.Id.cchToken;
573	*ppCfgAst = pCfgAst;
574	}
575	else
576	{
577	autostartConfigTokenizerMsgUnexpectedToken(pToken, "non reserved token");
578	rc = VERR_INVALID_PARAMETER;
579	}
580
581	return rc;
582	}
583
584	/**
585	* Parses a compound node constructing the AST and returning it on success.
586	*
587	* @returns VBox status code.
588	* @param pCfgTokenizer The tokenizer for the config stream.
589	* @param pszScopeId The scope ID of the compound node.
590	* @param ppCfgAst Where to store the resulting AST on success.
591	*/
592	static int autostartConfigParseCompoundNode(PCFGTOKENIZER pCfgTokenizer, const char *pszScopeId,
593	PCFGAST *ppCfgAst)
594	{
595	int rc = VINF_SUCCESS;
596	unsigned cAstNodesMax = 10;
597	unsigned idxAstNodeCur = 0;
598	PCFGAST pCfgAst = NULL;
599
600	pCfgAst = (PCFGAST)RTMemAllocZ(RT_OFFSETOF(CFGAST, u.Compound.apAstNodes[cAstNodesMax]));
601	if (!pCfgAst)
602	return VERR_NO_MEMORY;
603
604	pCfgAst->enmType = CFGASTNODETYPE_COMPOUND;
605	pCfgAst->u.Compound.cAstNodes = 0;
606	pCfgAst->pszKey = RTStrDup(pszScopeId);
607	if (!pCfgAst->pszKey)
608	{
609	RTMemFree(pCfgAst);
610	return VERR_NO_MEMORY;
611	}
612
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	{
648	autostartConfigTokenizerMsgUnexpectedToken(pToken, "non reserved token");
649	rc = VERR_INVALID_PARAMETER;
650	}
651
652	/* Add to the current compound node. */
653	if (RT_SUCCESS(rc))
654	{
655	if (pCfgAst->u.Compound.cAstNodes >= cAstNodesMax)
656	{
657	cAstNodesMax += 10;
658
659	PCFGAST pCfgAstNew = (PCFGAST)RTMemRealloc(pCfgAst, RT_OFFSETOF(CFGAST, u.Compound.apAstNodes[cAstNodesMax]));
660	if (!pCfgAstNew)
661	rc = VERR_NO_MEMORY;
662	else
663	pCfgAst = pCfgAstNew;
664	}
665
666	if (RT_SUCCESS(rc))
667	{
668	pCfgAst->u.Compound.apAstNodes[pCfgAst->u.Compound.cAstNodes] = pAstNode;
669	pCfgAst->u.Compound.cAstNodes++;
670	}
671	}
672
673	autostartConfigTokenFree(pCfgTokenizer, pToken);
674
675	} while (RT_SUCCESS(rc));
676
677	if (RT_SUCCESS(rc))
678	*ppCfgAst = pCfgAst;
679	else
680	autostartConfigAstDestroy(pCfgAst);
681
682	return rc;
683	}
684
685	DECLHIDDEN(int) autostartParseConfig(const char pszFilename, PCFGAST ppCfgAst)
686	{
687	PCFGTOKENIZER pCfgTokenizer = NULL;
688	int rc = VINF_SUCCESS;
689	PCFGAST pCfgAst = NULL;
690
691	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
692	AssertPtrReturn(ppCfgAst, VERR_INVALID_POINTER);
693
694	rc = autostartConfigTokenizerCreate(pszFilename, &pCfgTokenizer);
695	if (RT_SUCCESS(rc))
696	{
697	rc = autostartConfigParseCompoundNode(pCfgTokenizer, "", &pCfgAst);
698	if (RT_SUCCESS(rc))
699	rc = autostartConfigTokenizerCheckAndConsume(pCfgTokenizer, CFGTOKENTYPE_EOF);
700	}
701
702	if (pCfgTokenizer)
703	autostartConfigTokenizerDestroy(pCfgTokenizer);
704
705	if (RT_SUCCESS(rc))
706	*ppCfgAst = pCfgAst;
707
708	return rc;
709	}
710
711	DECLHIDDEN(void) autostartConfigAstDestroy(PCFGAST pCfgAst)
712	{
713	AssertPtrReturnVoid(pCfgAst);
714
715	switch (pCfgAst->enmType)
716	{
717	case CFGASTNODETYPE_KEYVALUE:
718	{
719	RTMemFree(pCfgAst);
720	break;
721	}
722	case CFGASTNODETYPE_COMPOUND:
723	{
724	for (unsigned i = 0; i < pCfgAst->u.Compound.cAstNodes; i++)
725	autostartConfigAstDestroy(pCfgAst->u.Compound.apAstNodes[i]);
726	RTMemFree(pCfgAst);
727	break;
728	}
729	case CFGASTNODETYPE_LIST:
730	default:
731	AssertMsgFailed(("Invalid AST node type %d\n", pCfgAst->enmType));
732	}
733	}
734
735	DECLHIDDEN(PCFGAST) autostartConfigAstGetByName(PCFGAST pCfgAst, const char *pszName)
736	{
737	if (!pCfgAst)
738	return NULL;
739
740	AssertReturn(pCfgAst->enmType == CFGASTNODETYPE_COMPOUND, NULL);
741
742	for (unsigned i = 0; i < pCfgAst->u.Compound.cAstNodes; i++)
743	{
744	PCFGAST pNode = pCfgAst->u.Compound.apAstNodes[i];
745
746	if (!RTStrCmp(pNode->pszKey, pszName))
747	return pNode;
748	}
749
750	return NULL;
751	}
752

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source: vbox/trunk/src/VBox/Frontends/VBoxAutostart/VBoxAutostartCfg.cpp@ 48458

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