path.cpp@ 1532

Last change on this file since 1532 was 1307, checked in by vboxsync, 18 years ago
Added temps to avoid attempts to free bogus (because modified) pointers.
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File size: 14.9 KB

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1	/* $Id: path.cpp 1307 2007-03-07 16:53:15Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - Path Manipulation.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#include <iprt/path.h>
27	#include <iprt/dir.h>
28	#include <iprt/param.h>
29	#include <iprt/string.h>
30	#include <iprt/assert.h>
31	#include <iprt/string.h>
32	#include <iprt/ctype.h>
33	#include <iprt/err.h>
34	#include <iprt/uni.h>
35	#include "internal/fs.h"
36
37
38	/**
39	* Strips the filename from a path.
40	*
41	* @param pszPath Path which filename should be extracted from.
42	*
43	*/
44	RTDECL(void) RTPathStripFilename(char *pszPath)
45	{
46	char *psz = pszPath;
47	char *pszLastSep = pszPath;
48
49	for (;; psz++)
50	{
51	switch (*psz)
52	{
53	/* handle separators. */
54	#if defined(__WIN__) \|\| defined(__OS2__)
55	case ':':
56	pszLastSep = psz + 1;
57	break;
58
59	case '\\':
60	#endif
61	case '/':
62	pszLastSep = psz;
63	break;
64
65	/* the end */
66	case '\0':
67	if (pszLastSep == pszPath)
68	*pszLastSep++ = '.';
69	*pszLastSep = '\0';
70	return;
71	}
72	}
73	/* will never get here */
74	}
75
76
77	/**
78	* Strips the extension from a path.
79	*
80	* @param pszPath Path which extension should be stripped.
81	*/
82	RTDECL(void) RTPathStripExt(char *pszPath)
83	{
84	char *pszDot = NULL;
85	for (;; pszPath++)
86	{
87	switch (*pszPath)
88	{
89	/* handle separators. */
90	#if defined(__WIN__) \|\| defined(__OS2__)
91	case ':':
92	case '\\':
93	#endif
94	case '/':
95	pszDot = NULL;
96	break;
97	case '.':
98	pszDot = pszPath;
99	break;
100
101	/* the end */
102	case '\0':
103	if (pszDot)
104	*pszDot = '\0';
105	return;
106	}
107	}
108	/* will never get here */
109	}
110
111
112	/**
113	* Finds the filename in a path.
114	*
115	* @returns Pointer to filename within pszPath.
116	* @returns NULL if no filename (i.e. empty string or ends with a slash).
117	* @param pszPath Path to find filename in.
118	*/
119	RTDECL(char ) RTPathFilename(const char pszPath)
120	{
121	const char *psz = pszPath;
122	const char *pszLastComp = pszPath;
123
124	for (;; psz++)
125	{
126	switch (*psz)
127	{
128	/* handle separators. */
129	#if defined(__WIN__) \|\| defined(__OS2__)
130	case ':':
131	pszLastComp = psz + 1;
132	break;
133
134	case '\\':
135	#endif
136	case '/':
137	pszLastComp = psz + 1;
138	break;
139
140	/* the end */
141	case '\0':
142	if (*pszLastComp)
143	return (char )(void )pszLastComp;
144	return NULL;
145	}
146	}
147
148	/* will never get here */
149	return NULL;
150	}
151
152
153	/**
154	* Strips the trailing slashes of a path name.
155	*
156	* @param pszPath Path to strip.
157	*/
158	RTDECL(void) RTPathStripTrailingSlash(char *pszPath)
159	{
160	char *pszEnd = strchr(pszPath, '\0');
161	while (pszEnd-- > pszPath)
162	{
163	switch (*pszEnd)
164	{
165	case '/':
166	#if defined(__WIN__) \|\| defined(__OS2__)
167	case '\\':
168	#endif
169	*pszEnd = '\0';
170	break;
171	default:
172	return;
173	}
174	}
175	return;
176	}
177
178
179	/**
180	* Finds the extension part of in a path.
181	*
182	* @returns Pointer to extension within pszPath.
183	* @returns NULL if no extension.
184	* @param pszPath Path to find extension in.
185	*/
186	RTDECL(char ) RTPathExt(const char pszPath)
187	{
188	const char *psz = pszPath;
189	const char *pszExt = NULL;
190
191	for (;; psz++)
192	{
193	switch (*psz)
194	{
195	/* handle separators. */
196	#if defined(__WIN__) \|\| defined(__OS2__)
197	case ':':
198	pszExt = NULL;
199	break;
200
201	case '\\':
202	#endif
203	case '/':
204	pszExt = NULL;
205	break;
206	case '.':
207	pszExt = psz;
208	break;
209
210	/* the end */
211	case '\0':
212	if (pszExt)
213	return (char )(void )pszExt;
214	return NULL;
215	}
216	}
217
218	/* will never get here */
219	return NULL;
220	}
221
222
223	/**
224	* Checks if a path have an extension.
225	*
226	* @returns true if extension present.
227	* @returns false if no extension.
228	* @param pszPath Path to check.
229	*/
230	RTDECL(bool) RTPathHaveExt(const char *pszPath)
231	{
232	return RTPathExt(pszPath) != NULL;
233	}
234
235
236	/**
237	* Checks if a path includes more than a filename.
238	*
239	* @returns true if path present.
240	* @returns false if no path.
241	* @param pszPath Path to check.
242	*/
243	RTDECL(bool) RTPathHavePath(const char *pszPath)
244	{
245	#if defined(__WIN__) \|\| defined(__OS2__)
246	return strpbrk(pszPath, "/\\:") != NULL;
247	#else
248	return strpbrk(pszPath, "/") != NULL;
249	#endif
250	}
251
252
253	/**
254	* Helper for RTPathCompare() and RTPathStartsWith().
255	*
256	* @returns similar to strcmp.
257	* @param pszPath1 Path to compare.
258	* @param pszPath2 Path to compare.
259	* @param fLimit Limit the comparison to the length of \a pszPath2
260	* @internal
261	*/
262	static int rtPathCompare(const char pszPath1, const char pszPath2, bool fLimit)
263	{
264	if (pszPath1 == pszPath2)
265	return 0;
266	if (!pszPath1)
267	return -1;
268	if (!pszPath2)
269	return 1;
270
271	#if defined(__WIN__) \|\| defined(__OS2__)
272	PRTUNICP puszPath1;
273	int rc = RTStrToUni(pszPath1, &puszPath1);
274	if (RT_FAILURE(rc))
275	return -1;
276	PRTUNICP puszPath2;
277	rc = RTStrToUni(pszPath2, &puszPath2);
278	if (RT_FAILURE(rc))
279	{
280	RTUniFree(puszPath1);
281	return 1;
282	}
283
284	int iDiff = 0;
285	PRTUNICP puszTmpPath1 = puszPath1;
286	PRTUNICP puszTmpPath2 = puszPath2;
287	for (;;)
288	{
289	register RTUNICP uc1 = *puszTmpPath1;
290	register RTUNICP uc2 = *puszTmpPath2;
291	if (uc1 != uc2)
292	{
293	if (uc1 == '\\')
294	uc1 = '/';
295	else
296	uc1 = RTUniCpToUpper(uc1);
297	if (uc2 == '\\')
298	uc2 = '/';
299	else
300	uc2 = RTUniCpToUpper(uc2);
301	if (uc1 != uc2)
302	{
303	iDiff = uc1 > uc2 ? 1 : -1; /* (overflow/underflow paranoia) */
304	if (fLimit && uc2 == '\0')
305	iDiff = 0;
306	break;
307	}
308	}
309	if (!uc1)
310	break;
311	puszTmpPath1++;
312	puszTmpPath2++;
313
314	}
315
316	RTUniFree(puszPath2);
317	RTUniFree(puszPath1);
318	return iDiff;
319
320	#else
321	if (!fLimit)
322	return strcmp(pszPath1, pszPath2);
323	return strncmp(pszPath1, pszPath2, strlen(pszPath2));
324	#endif
325	}
326
327
328	/**
329	* Compares two paths.
330	*
331	* The comparison takes platform-dependent details into account,
332	* such as:
333	* <ul>
334	* <li>On DOS-like platforms, both \|\\| and \|/\| separator chars are considered
335	* to be equal.
336	* <li>On platforms with case-insensitive file systems, mismatching characters
337	* are uppercased and compared again.
338	* </ul>
339	*
340	* @remark
341	*
342	* File system details are currently ignored. This means that you won't get
343	* case-insentive compares on unix systems when a path goes into a case-insensitive
344	* filesystem like FAT, HPFS, HFS, NTFS, JFS, or similar. For NT, OS/2 and similar
345	* you'll won't get case-sensitve compares on a case-sensitive file system.
346	*
347	* @param pszPath1 Path to compare (must be an absolute path).
348	* @param pszPath2 Path to compare (must be an absolute path).
349	*
350	* @returns < 0 if the first path less than the second path.
351	* @returns 0 if the first path identical to the second path.
352	* @returns > 0 if the first path greater than the second path.
353	*/
354	RTDECL(int) RTPathCompare(const char pszPath1, const char pszPath2)
355	{
356	return rtPathCompare(pszPath1, pszPath2, false /* full path lengths */);
357	}
358
359
360	/**
361	* Checks if a path starts with the given parent path.
362	*
363	* This means that either the path and the parent path matches completely, or that
364	* the path is to some file or directory residing in the tree given by the parent
365	* directory.
366	*
367	* The path comparison takes platform-dependent details into account,
368	* see RTPathCompare() for details.
369	*
370	* @param pszPath Path to check, must be an absolute path.
371	* @param pszParentPath Parent path, must be an absolute path.
372	* No trailing directory slash!
373	*
374	* @returns \|true\| when \a pszPath starts with \a pszParentPath (or when they
375	* are identical), or \|false\| otherwise.
376	*
377	* @remark This API doesn't currently handle root directory compares in a manner
378	* consistant with the other APIs. RTPathStartsWith(pszSomePath, "/") will
379	* not work if pszSomePath isn't "/".
380	*/
381	RTDECL(bool) RTPathStartsWith(const char pszPath, const char pszParentPath)
382	{
383	if (pszPath == pszParentPath)
384	return true;
385	if (!pszPath \|\| !pszParentPath)
386	return false;
387
388	if (rtPathCompare(pszPath, pszParentPath, true /* limited by path 2 */) != 0)
389	return false;
390
391	const size_t cchParentPath = strlen(pszParentPath);
392	return RTPATH_IS_SLASH(pszPath[cchParentPath])
393	\|\| pszPath[cchParentPath] == '\0';
394	}
395
396
397	/**
398	* Same as RTPathReal only the result is RTStrDup()'ed.
399	*
400	* @returns Pointer to real path. Use RTStrFree() to free this string.
401	* @returns NULL if RTPathReal() or RTStrDup() fails.
402	* @param pszPath
403	*/
404	RTDECL(char ) RTPathRealDup(const char pszPath)
405	{
406	char szPath[RTPATH_MAX];
407	int rc = RTPathReal(pszPath, szPath, sizeof(szPath));
408	if (RT_SUCCESS(rc))
409	return RTStrDup(szPath);
410	return NULL;
411	}
412
413
414	/**
415	* Same as RTPathAbs only the result is RTStrDup()'ed.
416	*
417	* @returns Pointer to real path. Use RTStrFree() to free this string.
418	* @returns NULL if RTPathAbs() or RTStrDup() fails.
419	* @param pszPath The path to resolve.
420	*/
421	RTDECL(char ) RTPathAbsDup(const char pszPath)
422	{
423	char szPath[RTPATH_MAX];
424	int rc = RTPathAbs(pszPath, szPath, sizeof(szPath));
425	if (RT_SUCCESS(rc))
426	return RTStrDup(szPath);
427	return NULL;
428	}
429
430
431	/**
432	* Returns the length of the volume name specifier of the given path.
433	* If no such specifier zero is returned.
434	*/
435	size_t rtPathVolumeSpecLen(const char *pszPath)
436	{
437	#if defined (__OS2__) \|\| defined (__WIN__)
438	if (pszPath && *pszPath)
439	{
440	/* UTC path. */
441	if ( (pszPath[0] == '\\' \|\| pszPath[0] == '/')
442	&& (pszPath[1] == '\\' \|\| pszPath[1] == '/'))
443	return strcspn(pszPath + 2, "\\/") + 2;
444
445	/* Drive letter. */
446	if ( pszPath[1] == ':'
447	&& toupper(pszPath[0]) >= 'A' && toupper(pszPath[0]) <= 'Z')
448	return 2;
449	}
450	return 0;
451
452	#else
453	/* This isn't quite right when looking at the above stuff, but it works assuming that '//' does not mean UNC. */
454	/// @todo (dmik) well, it's better to consider there's no volume name
455	// at all on *nix systems
456	return 0;
457	// return pszPath && pszPath[0] == '/';
458	#endif
459	}
460
461
462	/**
463	* Get the absolute path (no symlinks, no . or .. components), assuming the
464	* given base path as the current directory. The resulting path doesn't have
465	* to exist.
466	*
467	* @returns iprt status code.
468	* @param pszBase The base path to act like a current directory.
469	* When NULL, the actual cwd is used (i.e. the call
470	* is equivalent to RTPathAbs(pszPath, ...).
471	* @param pszPath The path to resolve.
472	* @param pszAbsPath Where to store the absolute path.
473	* @param cchAbsPath Size of the buffer.
474	*/
475	RTDECL(int) RTPathAbsEx(const char pszBase, const char pszPath, char *pszAbsPath, unsigned cchAbsPath)
476	{
477	if (pszBase && pszPath && !rtPathVolumeSpecLen(pszPath))
478	{
479	#if defined(__WIN__)
480	/* The format for very long paths is not supported. */
481	if ( (pszBase[0] == '/' \|\| pszBase[0] == '\\')
482	&& (pszBase[1] == '/' \|\| pszBase[1] == '\\')
483	&& pszBase[2] == '?'
484	&& (pszBase[3] == '/' \|\| pszBase[3] == '\\'))
485	return VERR_INVALID_NAME;
486	#endif
487
488	/** @todo there are a couple of things which isn't 100% correct, although the
489	* current code will have to work for now - I don't have time to fix it right now.
490	*
491	* 1) On Windows & OS/2 we confuse '/' with an abspath spec and will
492	* not necessarily resolve it on the right drive.
493	* 2) A trailing slash in the base might cause UNC names to be created.
494	* 3) The lengths total doesn't have to be less than max length
495	* if the pszPath starts with a slash.
496	*/
497	size_t cchBase = strlen(pszBase);
498	size_t cchPath = strlen(pszPath);
499	if (cchBase + cchPath >= RTPATH_MAX)
500	return VERR_FILENAME_TOO_LONG;
501
502	bool fRootSpec = pszPath[0] == '/'
503	#if defined(__WIN__) \|\| defined(__OS2__)
504	\|\| pszPath[0] == '\\'
505	#endif
506	;
507	size_t cchVolSpec = rtPathVolumeSpecLen(pszBase);
508	char szPath[RTPATH_MAX];
509	if (fRootSpec)
510	{
511	/* join the disk name from base and the path */
512	memcpy(szPath, pszBase, cchVolSpec);
513	strcpy(&szPath[cchVolSpec], pszPath);
514	}
515	else
516	{
517	/* join the base path and the path */
518	strcpy(szPath, pszBase);
519	szPath[cchBase] = RTPATH_DELIMITER;
520	strcpy(&szPath[cchBase + 1], pszPath);
521	}
522	return RTPathAbs(szPath, pszAbsPath, cchAbsPath);
523	}
524
525	/* Fallback to the non Ex version /
526	return RTPathAbs(pszPath, pszAbsPath, cchAbsPath);
527	}
528
529
530	/**
531	* Same as RTPathAbsEx only the result is RTStrDup()'ed.
532	*
533	* @returns Pointer to the absolute path. Use RTStrFree() to free this string.
534	* @returns NULL if RTPathAbsEx() or RTStrDup() fails.
535	* @param pszBase The base path to act like a current directory.
536	* When NULL, the actual cwd is used (i.e. the call
537	* is equivalent to RTPathAbs(pszPath, ...).
538	* @param pszPath The path to resolve.
539	*/
540	RTDECL(char ) RTPathAbsExDup(const char pszBase, const char *pszPath)
541	{
542	char szPath[RTPATH_MAX];
543	int rc = RTPathAbsEx(pszBase, pszPath, szPath, sizeof(szPath));
544	if (RT_SUCCESS(rc))
545	return RTStrDup(szPath);
546	return NULL;
547	}
548

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