pjs/xpcom/io/nsLocalFileUnix.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code,
* released March 31, 1998.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Mike Shaver <shaver@mozilla.org>
*/
/*
* Implementation of nsIFile for ``Unixy'' systems.
*/
#ifndef _nsLocalFileUNIX_H_
#define _nsLocalFileUNIX_H_
#include <sys/stat.h>
#include <unistd.h>
#include "nscore.h"
#include "nsString.h"
#include "nsReadableUtils.h"
/**
* we need these for statfs()
*/
#ifdef HAVE_SYS_STATVFS_H
#if defined(__osf__) && defined(__DECCXX)
extern "C" int statvfs(const char *, struct statvfs *);
#endif
#include <sys/statvfs.h>
#endif
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#ifdef HAVE_STATVFS
#define STATFS statvfs
#else
#define STATFS statfs
#endif
// so we can statfs on freebsd
#if defined(__FreeBSD__)
#define HAVE_SYS_STATFS_H
#define STATFS statfs
#include <sys/param.h>
#include <sys/mount.h>
#endif
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class NS_COM nsLocalFile : public nsILocalFile
{
public:
NS_DEFINE_STATIC_CID_ACCESSOR(NS_LOCAL_FILE_CID)
nsLocalFile();
virtual ~nsLocalFile();
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static NS_METHOD nsLocalFileConstructor(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
// nsISupports
NS_DECL_ISUPPORTS
// nsIFile
NS_DECL_NSIFILE
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// nsILocalFile
NS_DECL_NSILOCALFILE
public:
static void GlobalInit();
static void GlobalShutdown();
private:
nsLocalFile(const nsLocalFile& other);
protected:
struct stat mCachedStat;
nsCString mPath;
PRPackedBool mHaveCachedStat;
void LocateNativeLeafName(nsACString::const_iterator &,
nsACString::const_iterator &);
nsresult CopyDirectoryTo(nsIFile *newParent);
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nsresult CreateAllAncestors(PRUint32 permissions);
nsresult GetNativeTargetPathName(nsIFile *newParent,
const nsACString &newName,
nsACString &_retval);
void InvalidateCache() {
mHaveCachedStat = PR_FALSE;
}
nsresult FillStatCache();
nsresult CreateAndKeepOpen(PRUint32 type, PRIntn flags,
PRUint32 permissions, PRFileDesc **_retval);
};
Fixes to use atomic rename(2) if possible in nsLocalFile::MoveTo (33098, r=?), plus a bunch of other fixes and cleanups: - Fix comment misstatements of fact in nsIFile.idl, improve style slightly. - Fix typo in comment in nsILocalFile.idl. - Avoid gratuitous nsCString and nsXPIDLCString copy-constructions, which entail malloc'ing, in nsLocalFileUnix.cpp's CopyTo and GetParent methods. But do use nsXPIDLCString instead of raw nsMemory::Alloc/Free. - Get rid of unnecessary mLL_II2L and mLL_L2II macros, use "prlong.h" API only. Also use the LL_* macros consistently in case a Unix lacking long long type support wants to use this code. * BTW, the "Date" methods should be renamed to use "Time" instead -- after all PRTime is the type, and traditionally "time" refers to the time-number, a scalar independent of one's position on the surface of the earth, while "date" refers to a struct full of locale-specific information derived from time and some "environment" variables such as DST. Can we rename these nsIFile methods before Mozilla 0.9 / Netscape 6? - Use CHECK_mPath consistently and first, before any assertions relating to arguments (which logically come after the 'this' parameter CHECK_mPath is making assertions about). - Use nsCOMPtr for singly-inheriting implementations of XPCOM interfaces, to avoid scary-when-scaled 0-refcnt instances from being handled (these all got a ref via QI or equivalent soon enough, but you never know). This also removed some naked deletes. - Canonize all paths copied into mPath to lack trailing slashes, so we don't need to strip trailing slashes elsewhere, in higher-frequency methods (you set path less often than you get it or a substring of it). - ssize_t for strlen return values. - Since shaver used a function pointer to consolidate creat/mkdir logic, but didn't fold the necessary close of the new fd returned by non-failing creat into the pointed-at function, I did that. - AppendRelativePath forbids .. as a component (bounded by / or beginning or end of string on either side), not just in the middle of fragment (so that foo..bar is not an illegal relative pathname -- it should not be). BTW, what the heck is the difference between NS_ERROR_FILE_UNRECOGNIZED_PATH and ...INVALID_PATH? - SetLeafName was overallocating the new pathname buffer by failing to subtract the old leafname's length. - CopyTo was failing to return an NSRESULT_FOR_ERRNO(), it just called that macro on a line by itself -- eek! It also contained redundant if (newFD == nsnull) {...} cleanup code, it did a useless PR_GetFileInfo call, and it leaked FDs on read or write error. - Implemented CopyToFollowingLinks as a forwarded call to CopyTo, Unix does not support "copying" a symlink via normal file i/o. Should we instead lstat in CopyTo and if a link is the source of the copy, do readlink and then symlink? - Fixed the readlink method (GetTarget) to null-terminate the link string in the out parameter (readlink does not do that for you). - Lots of little nsnull vs. NULL vs. 0, == and != applied to boolean or null literals, white-space, indentation, bracing, comment, and sloppy code order (e.g., declaring an initialized variable that's not used till after early returns) fixes. Also invert some return logic so that NS_OK is the normal, least indented, final return.
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#endif /* _nsLocalFileUNIX_H_ */