3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Angus Leeming
8 * Full author contact details are available in file CREDITS.
13 #include "support/FileName.h"
14 #include "support/FileNameList.h"
16 #include "support/convert.h"
17 #include "support/debug.h"
18 #include "support/filetools.h"
19 #include "support/lassert.h"
20 #include "support/lstrings.h"
21 #include "support/qstring_helpers.h"
22 #include "support/os.h"
23 #include "support/Package.h"
24 #include "support/qstring_helpers.h"
31 #include <QTemporaryFile>
34 #include <boost/crc.hpp>
35 #include <boost/scoped_array.hpp>
44 #ifdef HAVE_SYS_TYPES_H
45 # include <sys/types.h>
47 #ifdef HAVE_SYS_STAT_H
48 # include <sys/stat.h>
63 #if defined(HAVE_MKSTEMP) && ! defined(HAVE_DECL_MKSTEMP)
64 extern "C" int mkstemp(char *);
67 #if !defined(HAVE_MKSTEMP) && defined(HAVE_MKTEMP)
71 # ifdef HAVE_PROCESS_H
76 // Three implementations of checksum(), depending on having mmap support or not.
77 #if defined(HAVE_MMAP) && defined(HAVE_MUNMAP)
80 #endif // SUM_WITH_MMAP
84 // OK, this is ugly, but it is the only workaround I found to compile
85 // with gcc (any version) on a system which uses a non-GNU toolchain.
86 // The problem is that gcc uses a weak symbol for a particular
87 // instantiation and that the system linker usually does not
88 // understand those weak symbols (seen on HP-UX, tru64, AIX and
89 // others). Thus we force an explicit instanciation of this particular
91 template struct boost::detail::crc_table_t<32, 0x04C11DB7, true>;
96 /////////////////////////////////////////////////////////////////////
100 /////////////////////////////////////////////////////////////////////
102 struct FileName::Private
106 Private(string const & abs_filename) : fi(toqstr(abs_filename))
108 fi.setCaching(fi.exists() ? true : false);
111 inline void refresh()
113 // There seems to be a bug in Qt >= 4.2.0, at least, that causes problems with
114 // QFileInfo::refresh() on *nix. So we recreate the object in that case.
115 // FIXME: When Trolltech fixes the bug, we will have to replace 0x999999 below
116 // with the actual working minimum version.
117 #if defined(_WIN32) || (QT_VERSION >= 0x999999)
120 fi = QFileInfo(fi.absoluteFilePath());
126 bool isFilesystemEqual(QString const & lhs, QString const & rhs)
128 return QString::compare(lhs, rhs, os::isFilesystemCaseSensitive() ?
129 Qt::CaseSensitive : Qt::CaseInsensitive) == 0;
136 /////////////////////////////////////////////////////////////////////
140 /////////////////////////////////////////////////////////////////////
143 FileName::FileName() : d(new Private)
148 FileName::FileName(string const & abs_filename)
149 : d(abs_filename.empty() ? new Private : new Private(abs_filename))
154 FileName::~FileName()
160 FileName::FileName(FileName const & rhs) : d(new Private)
166 FileName::FileName(FileName const & rhs, string const & suffix) : d(new Private)
172 FileName & FileName::operator=(FileName const & rhs)
179 bool FileName::empty() const
181 return d->fi.absoluteFilePath().isEmpty();
185 bool FileName::isAbsolute() const
187 return d->fi.isAbsolute();
191 string FileName::absFilename() const
193 return fromqstr(d->fi.absoluteFilePath());
197 void FileName::set(string const & name)
199 d->fi.setFile(toqstr(name));
203 void FileName::set(FileName const & rhs, string const & suffix)
205 if (!rhs.d->fi.isDir())
206 d->fi.setFile(rhs.d->fi.filePath() + toqstr(suffix));
208 d->fi.setFile(QDir(rhs.d->fi.absoluteFilePath()), toqstr(suffix));
212 void FileName::erase()
218 bool FileName::copyTo(FileName const & name) const
220 LYXERR(Debug::FILES, "Copying " << name);
221 QFile::remove(name.d->fi.absoluteFilePath());
222 bool success = QFile::copy(d->fi.absoluteFilePath(), name.d->fi.absoluteFilePath());
224 LYXERR0("FileName::copyTo(): Could not copy file "
225 << *this << " to " << name);
230 bool FileName::renameTo(FileName const & name) const
232 bool success = QFile::rename(d->fi.absoluteFilePath(), name.d->fi.absoluteFilePath());
234 LYXERR0("Could not rename file " << *this << " to " << name);
239 bool FileName::moveTo(FileName const & name) const
241 QFile::remove(name.d->fi.absoluteFilePath());
243 bool success = QFile::rename(d->fi.absoluteFilePath(),
244 name.d->fi.absoluteFilePath());
246 LYXERR0("Could not move file " << *this << " to " << name);
251 bool FileName::changePermission(unsigned long int mode) const
253 #if defined (HAVE_CHMOD) && defined (HAVE_MODE_T)
254 if (::chmod(toFilesystemEncoding().c_str(), mode_t(mode)) != 0) {
255 LYXERR0("File " << *this << ": cannot change permission to "
264 string FileName::toFilesystemEncoding() const
266 // FIXME: This doesn't work on Windows for non ascii file names with Qt < 4.4.
267 // Provided that Windows package uses Qt4.4, this isn't a problem.
268 QByteArray const encoded = QFile::encodeName(d->fi.absoluteFilePath());
269 return string(encoded.begin(), encoded.end());
273 FileName FileName::fromFilesystemEncoding(string const & name)
275 QByteArray const encoded(name.c_str(), name.length());
276 return FileName(fromqstr(QFile::decodeName(encoded)));
280 bool FileName::exists() const
282 return d->fi.exists();
286 bool FileName::isSymLink() const
288 return d->fi.isSymLink();
292 bool FileName::isFileEmpty() const
294 return d->fi.size() == 0;
298 bool FileName::isDirectory() const
300 return d->fi.isDir();
304 bool FileName::isReadOnly() const
306 return d->fi.isReadable() && !d->fi.isWritable();
310 bool FileName::isReadableDirectory() const
312 return d->fi.isDir() && d->fi.isReadable();
316 string FileName::onlyFileName() const
318 return fromqstr(d->fi.fileName());
322 string FileName::onlyFileNameWithoutExt() const
324 return fromqstr(d->fi.baseName());
328 string FileName::extension() const
330 return fromqstr(d->fi.suffix());
334 bool FileName::hasExtension(const string & ext)
336 return Private::isFilesystemEqual(d->fi.suffix(), toqstr(ext));
340 FileName FileName::onlyPath() const
343 path.d->fi.setFile(d->fi.path());
348 bool FileName::isReadableFile() const
350 return d->fi.isFile() && d->fi.isReadable();
354 bool FileName::isWritable() const
356 return d->fi.isWritable();
360 bool FileName::isDirWritable() const
362 LASSERT(d->fi.isDir(), return false);
363 QFileInfo tmp(QDir(d->fi.absoluteFilePath()), "lyxwritetest");
364 QTemporaryFile qt_tmp(tmp.absoluteFilePath());
366 LYXERR(Debug::FILES, "Directory " << *this << " is writable");
369 LYXERR(Debug::FILES, "Directory " << *this << " is not writable");
374 FileNameList FileName::dirList(string const & ext) const
376 FileNameList dirlist;
377 if (!isDirectory()) {
378 LYXERR0("Directory '" << *this << "' does not exist!");
382 QDir dir = d->fi.absoluteDir();
387 case '.': filter = "*" + toqstr(ext); break;
388 case '*': filter = toqstr(ext); break;
389 default: filter = "*." + toqstr(ext);
391 dir.setNameFilters(QStringList(filter));
392 LYXERR(Debug::FILES, "filtering on extension "
393 << fromqstr(filter) << " is requested.");
396 QFileInfoList list = dir.entryInfoList();
397 for (int i = 0; i != list.size(); ++i) {
398 FileName fi(fromqstr(list.at(i).absoluteFilePath()));
399 dirlist.push_back(fi);
400 LYXERR(Debug::FILES, "found file " << fi);
407 static string createTempFile(QString const & mask)
409 QTemporaryFile qt_tmp(mask);
411 string const temp_file = fromqstr(qt_tmp.fileName());
412 LYXERR(Debug::FILES, "Temporary file `" << temp_file << "' created.");
415 LYXERR(Debug::FILES, "Unable to create temporary file with following template: "
416 << qt_tmp.fileTemplate());
421 FileName FileName::tempName(FileName const & temp_dir, string const & mask)
423 QFileInfo tmp_fi(QDir(temp_dir.d->fi.absoluteFilePath()), toqstr(mask));
424 LYXERR(Debug::FILES, "Temporary file in " << tmp_fi.absoluteFilePath());
425 return FileName(createTempFile(tmp_fi.absoluteFilePath()));
429 FileName FileName::tempName(string const & mask)
431 return tempName(package().temp_dir(), mask);
435 FileName FileName::getcwd()
437 return FileName(".");
441 FileName FileName::tempPath()
443 return FileName(os::internal_path(fromqstr(QDir::tempPath())));
447 time_t FileName::lastModified() const
449 // QFileInfo caches information about the file. So, in case this file has
450 // been touched between the object creation and now, we refresh the file
453 return d->fi.lastModified().toTime_t();
457 bool FileName::chdir() const
459 return QDir::setCurrent(d->fi.absoluteFilePath());
463 unsigned long FileName::checksum() const
465 unsigned long result = 0;
468 //LYXERR0("File \"" << absFilename() << "\" does not exist!");
471 // a directory may be passed here so we need to test it. (bug 3622)
473 LYXERR0('"' << absFilename() << "\" is a directory!");
477 // This is used in the debug output at the end of the method.
479 if (lyxerr.debugging(Debug::FILES))
482 #if QT_VERSION >= 0x999999
483 // First version of checksum uses Qt4.4 mmap support.
484 // FIXME: This code is not ready with Qt4.4.2,
485 // see http://bugzilla.lyx.org/show_bug.cgi?id=5293
486 // FIXME: should we check if the MapExtension extension is supported?
487 // see QAbstractFileEngine::supportsExtension() and
488 // QAbstractFileEngine::MapExtension)
489 QFile qf(fi.filePath());
490 if (!qf.open(QIODevice::ReadOnly))
492 qint64 size = fi.size();
493 uchar * ubeg = qf.map(0, size);
494 uchar * uend = ubeg + size;
495 boost::crc_32_type ucrc;
496 ucrc.process_block(ubeg, uend);
499 result = ucrc.checksum();
503 string const encoded = toFilesystemEncoding();
504 char const * file = encoded.c_str();
507 //LYXERR(Debug::FILES, "using mmap (lightning fast)");
509 int fd = open(file, O_RDONLY);
516 void * mm = mmap(0, info.st_size, PROT_READ,
518 // Some platforms have the wrong type for MAP_FAILED (compaq cxx).
519 if (mm == reinterpret_cast<void*>(MAP_FAILED)) {
524 char * beg = static_cast<char*>(mm);
525 char * end = beg + info.st_size;
527 boost::crc_32_type crc;
528 crc.process_block(beg, end);
529 result = crc.checksum();
531 munmap(mm, info.st_size);
534 #else // no SUM_WITH_MMAP
536 //LYXERR(Debug::FILES, "lyx::sum() using istreambuf_iterator (fast)");
537 ifstream ifs(file, ios_base::in | ios_base::binary);
541 istreambuf_iterator<char> beg(ifs);
542 istreambuf_iterator<char> end;
543 boost::crc_32_type crc;
544 crc = for_each(beg, end, crc);
545 result = crc.checksum();
547 #endif // SUM_WITH_MMAP
550 LYXERR(Debug::FILES, "Checksumming \"" << absFilename() << "\" "
551 << result << " lasted " << t.elapsed() << " ms.");
556 bool FileName::removeFile() const
558 bool const success = QFile::remove(d->fi.absoluteFilePath());
559 if (!success && exists())
560 LYXERR0("Could not delete file " << *this);
565 static bool rmdir(QFileInfo const & fi)
567 QDir dir(fi.absoluteFilePath());
568 QFileInfoList list = dir.entryInfoList();
570 for (int i = 0; i != list.size(); ++i) {
571 if (list.at(i).fileName() == ".")
573 if (list.at(i).fileName() == "..")
576 if (list.at(i).isDir()) {
577 LYXERR(Debug::FILES, "Removing dir "
578 << fromqstr(list.at(i).absoluteFilePath()));
579 removed = rmdir(list.at(i));
582 LYXERR(Debug::FILES, "Removing file "
583 << fromqstr(list.at(i).absoluteFilePath()));
584 removed = dir.remove(list.at(i).fileName());
588 LYXERR0("Could not delete "
589 << fromqstr(list.at(i).absoluteFilePath()));
592 QDir parent = fi.absolutePath();
593 success &= parent.rmdir(fi.fileName());
598 bool FileName::destroyDirectory() const
600 bool const success = rmdir(d->fi);
602 LYXERR0("Could not delete " << *this);
608 // Only used in non Win32 platforms
609 static int mymkdir(char const * pathname, unsigned long int mode)
611 // FIXME: why don't we have mode_t in lyx::mkdir prototype ??
613 # if MKDIR_TAKES_ONE_ARG
615 return ::mkdir(pathname);
616 // FIXME: "Permissions of created directories are ignored on this system."
619 return ::mkdir(pathname, mode_t(mode));
621 #elif defined(_WIN32)
623 return CreateDirectory(pathname, 0) != 0 ? 0 : -1;
624 // FIXME: "Permissions of created directories are ignored on this system."
626 return ::_mkdir(pathname);
627 // FIXME: "Permissions of created directories are ignored on this system."
629 # error "Don't know how to create a directory on this system."
635 bool FileName::createDirectory(int permission) const
637 LASSERT(!empty(), return false);
639 // FIXME: "Permissions of created directories are ignored on this system."
642 return mymkdir(toFilesystemEncoding().c_str(), permission) == 0;
647 bool FileName::createPath() const
649 LASSERT(!empty(), /**/);
650 LYXERR(Debug::FILES, "creating path '" << *this << "'.");
655 bool success = dir.mkpath(d->fi.absoluteFilePath());
657 LYXERR0("Cannot create path '" << *this << "'!");
662 docstring const FileName::absoluteFilePath() const
664 return qstring_to_ucs4(d->fi.absoluteFilePath());
668 docstring FileName::displayName(int threshold) const
670 return makeDisplayPath(absFilename(), threshold);
674 docstring FileName::fileContents(string const & encoding) const
676 if (!isReadableFile()) {
677 LYXERR0("File '" << *this << "' is not redable!");
681 QFile file(d->fi.absoluteFilePath());
682 if (!file.open(QIODevice::ReadOnly)) {
683 LYXERR0("File '" << *this
684 << "' could not be opened in read only mode!");
687 QByteArray contents = file.readAll();
690 if (contents.isEmpty()) {
691 LYXERR(Debug::FILES, "File '" << *this
692 << "' is either empty or some error happened while reading it.");
697 if (encoding.empty() || encoding == "UTF-8")
698 s = QString::fromUtf8(contents.data());
699 else if (encoding == "ascii")
700 s = QString::fromAscii(contents.data());
701 else if (encoding == "local8bit")
702 s = QString::fromLocal8Bit(contents.data());
703 else if (encoding == "latin1")
704 s = QString::fromLatin1(contents.data());
706 return qstring_to_ucs4(s);
710 void FileName::changeExtension(string const & extension)
712 // FIXME: use Qt native methods...
713 string const oldname = absFilename();
714 string::size_type const last_slash = oldname.rfind('/');
715 string::size_type last_dot = oldname.rfind('.');
716 if (last_dot < last_slash && last_slash != string::npos)
717 last_dot = string::npos;
720 // Make sure the extension starts with a dot
721 if (!extension.empty() && extension[0] != '.')
722 ext= '.' + extension;
726 set(oldname.substr(0, last_dot) + ext);
730 string FileName::guessFormatFromContents() const
732 // the different filetypes and what they contain in one of the first lines
733 // (dots are any characters). (Herbert 20020131)
736 // EPS %!PS-Adobe-3.0 EPSF...
743 // PBM P1... or P4 (B/W)
744 // PGM P2... or P5 (Grayscale)
745 // PPM P3... or P6 (color)
746 // PS %!PS-Adobe-2.0 or 1.0, no "EPSF"!
747 // SGI \001\332... (decimal 474)
749 // TIFF II... or MM...
751 // XPM /* XPM */ sometimes missing (f.ex. tgif-export)
752 // ...static char *...
753 // XWD \000\000\000\151 (0x00006900) decimal 105
755 // GZIP \037\213 http://www.ietf.org/rfc/rfc1952.txt
756 // ZIP PK... http://www.halyava.ru/document/ind_arch.htm
757 // Z \037\235 UNIX compress
760 if (empty() || !isReadableFile())
763 ifstream ifs(toFilesystemEncoding().c_str());
765 // Couldn't open file...
769 static string const gzipStamp = "\037\213";
772 static string const zipStamp = "PK";
775 static string const compressStamp = "\037\235";
777 // Maximum strings to read
778 int const max_count = 50;
783 bool firstLine = true;
784 while ((count++ < max_count) && format.empty()) {
786 LYXERR(Debug::GRAPHICS, "filetools(getFormatFromContents)\n"
787 << "\tFile type not recognised before EOF!");
792 string const stamp = str.substr(0, 2);
793 if (firstLine && str.size() >= 2) {
794 // at first we check for a zipped file, because this
795 // information is saved in the first bytes of the file!
796 // also some graphic formats which save the information
797 // in the first line, too.
798 if (prefixIs(str, gzipStamp)) {
801 } else if (stamp == zipStamp) {
804 } else if (stamp == compressStamp) {
808 } else if (stamp == "BM") {
811 } else if (stamp == "\001\332") {
815 // Don't need to use str.at(0), str.at(1) because
816 // we already know that str.size() >= 2
817 } else if (str[0] == 'P') {
833 } else if ((stamp == "II") || (stamp == "MM")) {
836 } else if (prefixIs(str,"%TGIF")) {
839 } else if (prefixIs(str,"#FIG")) {
842 } else if (prefixIs(str,"GIF")) {
845 } else if (str.size() > 3) {
846 int const c = ((str[0] << 24) & (str[1] << 16) &
847 (str[2] << 8) & str[3]);
858 else if (contains(str,"EPSF"))
859 // dummy, if we have wrong file description like
860 // %!PS-Adobe-2.0EPSF"
863 else if (contains(str, "Grace"))
866 else if (contains(str, "JFIF"))
869 else if (contains(str, "%PDF"))
872 else if (contains(str, "PNG"))
875 else if (contains(str, "%!PS-Adobe")) {
878 if (contains(str,"EPSF"))
884 else if (contains(str, "_bits[]"))
887 else if (contains(str, "XPM") || contains(str, "static char *"))
890 else if (contains(str, "BITPIX"))
894 if (!format.empty()) {
895 LYXERR(Debug::GRAPHICS, "Recognised Fileformat: " << format);
899 LYXERR(Debug::GRAPHICS, "filetools(getFormatFromContents)\n"
900 << "\tCouldn't find a known format!");
905 bool FileName::isZippedFile() const
907 string const type = guessFormatFromContents();
908 return contains("gzip zip compress", type) && !type.empty();
912 docstring const FileName::relPath(string const & path) const
915 return makeRelPath(absoluteFilePath(), from_utf8(path));
919 bool operator==(FileName const & l, FileName const & r)
921 // FIXME: In future use Qt.
922 // Qt 4.4: We need to solve this warning from Qt documentation:
923 // * Long and short file names that refer to the same file on Windows are
924 // treated as if they referred to different files.
925 // This is supposed to be fixed for Qt5.
926 FileName const lhs(os::internal_path(l.absFilename()));
927 FileName const rhs(os::internal_path(r.absFilename()));
930 // QFileInfo::operator==() returns false if the two QFileInfo are empty.
934 // Avoid unnecessary checks below.
940 if (!lhs.d->fi.isSymLink() && !rhs.d->fi.isSymLink()) {
941 // Qt already checks if the filesystem is case sensitive or not.
942 return lhs.d->fi == rhs.d->fi;
945 // FIXME: When/if QFileInfo support symlink comparison, remove this code.
946 QFileInfo fi1(lhs.d->fi);
948 fi1 = QFileInfo(fi1.symLinkTarget());
949 QFileInfo fi2(rhs.d->fi);
951 fi2 = QFileInfo(fi2.symLinkTarget());
956 bool operator!=(FileName const & lhs, FileName const & rhs)
958 return !(operator==(lhs, rhs));
962 bool operator<(FileName const & lhs, FileName const & rhs)
964 return lhs.absFilename() < rhs.absFilename();
968 bool operator>(FileName const & lhs, FileName const & rhs)
970 return lhs.absFilename() > rhs.absFilename();
974 ostream & operator<<(ostream & os, FileName const & filename)
976 return os << filename.absFilename();
980 /////////////////////////////////////////////////////////////////////
984 /////////////////////////////////////////////////////////////////////
987 DocFileName::DocFileName()
988 : save_abs_path_(true)
992 DocFileName::DocFileName(string const & abs_filename, bool save_abs)
993 : FileName(abs_filename), save_abs_path_(save_abs), zipped_valid_(false)
997 DocFileName::DocFileName(FileName const & abs_filename, bool save_abs)
998 : FileName(abs_filename), save_abs_path_(save_abs), zipped_valid_(false)
1002 void DocFileName::set(string const & name, string const & buffer_path)
1004 FileName::set(name);
1005 bool const nameIsAbsolute = isAbsolute();
1006 save_abs_path_ = nameIsAbsolute;
1007 if (!nameIsAbsolute)
1008 FileName::set(makeAbsPath(name, buffer_path).absFilename());
1009 zipped_valid_ = false;
1013 void DocFileName::erase()
1016 zipped_valid_ = false;
1020 string DocFileName::relFilename(string const & path) const
1023 return to_utf8(relPath(path));
1027 string DocFileName::outputFilename(string const & path) const
1029 return save_abs_path_ ? absFilename() : relFilename(path);
1033 string DocFileName::mangledFilename(string const & dir) const
1035 // We need to make sure that every DocFileName instance for a given
1036 // filename returns the same mangled name.
1037 typedef map<string, string> MangledMap;
1038 static MangledMap mangledNames;
1039 MangledMap::const_iterator const it = mangledNames.find(absFilename());
1040 if (it != mangledNames.end())
1041 return (*it).second;
1043 string const name = absFilename();
1044 // Now the real work
1045 string mname = os::internal_path(name);
1046 // Remove the extension.
1047 mname = support::changeExtension(name, string());
1048 // The mangled name must be a valid LaTeX name.
1049 // The list of characters to keep is probably over-restrictive,
1050 // but it is not really a problem.
1051 // Apart from non-ASCII characters, at least the following characters
1052 // are forbidden: '/', '.', ' ', and ':'.
1053 // On windows it is not possible to create files with '<', '>' or '?'
1055 static string const keep = "abcdefghijklmnopqrstuvwxyz"
1056 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1058 string::size_type pos = 0;
1059 while ((pos = mname.find_first_not_of(keep, pos)) != string::npos)
1061 // Add the extension back on
1062 mname = support::changeExtension(mname, getExtension(name));
1064 // Prepend a counter to the filename. This is necessary to make
1065 // the mangled name unique.
1066 static int counter = 0;
1068 s << counter++ << mname;
1071 // MiKTeX's YAP (version 2.4.1803) crashes if the file name
1072 // is longer than about 160 characters. MiKTeX's pdflatex
1073 // is even pickier. A maximum length of 100 has been proven to work.
1074 // If dir.size() > max length, all bets are off for YAP. We truncate
1075 // the filename nevertheless, keeping a minimum of 10 chars.
1077 string::size_type max_length = max(100 - ((int)dir.size() + 1), 10);
1079 // If the mangled file name is too long, hack it to fit.
1080 // We know we're guaranteed to have a unique file name because
1082 if (mname.size() > max_length) {
1083 int const half = (int(max_length) / 2) - 2;
1085 mname = mname.substr(0, half) + "___" +
1086 mname.substr(mname.size() - half);
1090 mangledNames[absFilename()] = mname;
1095 bool DocFileName::isZipped() const
1097 if (!zipped_valid_) {
1098 zipped_ = isZippedFile();
1099 zipped_valid_ = true;
1105 string DocFileName::unzippedFilename() const
1107 return unzippedFileName(absFilename());
1111 bool operator==(DocFileName const & lhs, DocFileName const & rhs)
1113 return static_cast<FileName const &>(lhs)
1114 == static_cast<FileName const &>(rhs)
1115 && lhs.saveAbsPath() == rhs.saveAbsPath();
1119 bool operator!=(DocFileName const & lhs, DocFileName const & rhs)
1121 return !(lhs == rhs);
1124 } // namespace support