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37 * Implements functions in path.h.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_utility
60 #if GMX_NATIVE_WINDOWS
69 #include "gromacs/utility/dir_separator.h"
70 #include "gromacs/utility/exceptions.h"
71 #include "gromacs/utility/futil.h"
72 #include "gromacs/utility/stringutil.h"
77 //! Directory separator to use when joining paths.
78 const char cDirSeparator = '/';
79 //! Directory separators to use when parsing paths.
80 const char cDirSeparators[] = "/\\";
81 /*! \var cPathSeparator
83 * Separator to use to split the PATH environment variable.
85 * When reading the PATH environment variable, Unix separates entries
86 * with colon, while windows uses semicolon.
88 #if GMX_NATIVE_WINDOWS
89 const char cPathSeparator = ';';
91 const char cPathSeparator = ':';
94 //! Check whether a given character is a directory separator.
95 bool isDirSeparator(char chr)
97 return std::strchr(cDirSeparators, chr);
105 /********************************************************************
109 bool Path::containsDirectory(const std::string &path)
111 return path.find_first_of(cDirSeparators) != std::string::npos;
114 /* Check if the program name begins with "/" on unix/cygwin, or
115 * with "\" or "X:\" on windows. If not, the program name
116 * is relative to the current directory.
118 bool Path::isAbsolute(const char *path)
120 if (isDirSeparator(path[0]))
124 #if GMX_NATIVE_WINDOWS
125 return path[0] != '\0' && path[1] == ':' && isDirSeparator(path[2]);
131 bool Path::isAbsolute(const std::string &path)
133 return isAbsolute(path.c_str());
136 #if GMX_NATIVE_WINDOWS
139 struct handle_wrapper
142 handle_wrapper(HANDLE h)
146 if (handle != INVALID_HANDLE_VALUE)
148 ::CloseHandle(handle);
155 bool Path::isEquivalent(const std::string &path1, const std::string &path2)
157 //based on boost_1_56_0/libs/filesystem/src/operations.cpp under BSL
158 #if GMX_NATIVE_WINDOWS
159 // Note well: Physical location on external media is part of the
160 // equivalence criteria. If there are no open handles, physical location
161 // can change due to defragmentation or other relocations. Thus handles
162 // must be held open until location information for both paths has
165 // p2 is done first, so any error reported is for p1
171 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
174 FILE_FLAG_BACKUP_SEMANTICS,
181 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
184 FILE_FLAG_BACKUP_SEMANTICS,
187 if (h1.handle == INVALID_HANDLE_VALUE
188 || h2.handle == INVALID_HANDLE_VALUE)
190 // if one is invalid and the other isn't, then they aren't equivalent,
191 // but if both are invalid then it is an error
192 if (h1.handle == INVALID_HANDLE_VALUE
193 && h2.handle == INVALID_HANDLE_VALUE)
195 GMX_THROW(FileIOError("Path::isEquivalent called with two invalid files"));
201 // at this point, both handles are known to be valid
203 BY_HANDLE_FILE_INFORMATION info1, info2;
205 if (!GetFileInformationByHandle(h1.handle, &info1))
207 GMX_THROW(FileIOError("Path::isEquivalent: GetFileInformationByHandle failed"));
210 if (!GetFileInformationByHandle(h2.handle, &info2))
212 GMX_THROW(FileIOError("Path::isEquivalent: GetFileInformationByHandle failed"));
215 // In theory, volume serial numbers are sufficient to distinguish between
216 // devices, but in practice VSN's are sometimes duplicated, so last write
217 // time and file size are also checked.
219 info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber
220 && info1.nFileIndexHigh == info2.nFileIndexHigh
221 && info1.nFileIndexLow == info2.nFileIndexLow
222 && info1.nFileSizeHigh == info2.nFileSizeHigh
223 && info1.nFileSizeLow == info2.nFileSizeLow
224 && info1.ftLastWriteTime.dwLowDateTime
225 == info2.ftLastWriteTime.dwLowDateTime
226 && info1.ftLastWriteTime.dwHighDateTime
227 == info2.ftLastWriteTime.dwHighDateTime;
230 int e2 = stat(path2.c_str(), &s2);
231 int e1 = stat(path1.c_str(), &s1);
233 if (e1 != 0 || e2 != 0)
235 // if one is invalid and the other isn't then they aren't equivalent,
236 // but if both are invalid then it is an error.
237 if (e1 != 0 && e2 != 0)
239 GMX_THROW_WITH_ERRNO(
240 FileIOError("Path::isEquivalent called with two invalid files"),
246 // both stats now known to be valid
247 return s1.st_dev == s2.st_dev && s1.st_ino == s2.st_ino
248 // According to the POSIX stat specs, "The st_ino and st_dev fields
249 // taken together uniquely identify the file within the system."
250 // Just to be sure, size and mod time are also checked.
251 && s1.st_size == s2.st_size && s1.st_mtime == s2.st_mtime;
255 std::string Path::join(const std::string &path1,
256 const std::string &path2)
258 // TODO: Remove extra separators if they are present in the input paths.
259 return path1 + cDirSeparator + path2;
263 std::string Path::join(const std::string &path1,
264 const std::string &path2,
265 const std::string &path3)
267 // TODO: Remove extra separators if they are present in the input paths.
268 return path1 + cDirSeparator + path2 + cDirSeparator + path3;
271 std::string Path::getParentPath(const std::string &path)
273 /* Expects that the path doesn't contain "." or "..". If used on a path for
274 * which this isn't guaranteed realpath needs to be called first. */
275 size_t pos = path.find_last_of(cDirSeparators);
276 if (pos == std::string::npos)
278 return std::string();
280 return path.substr(0, pos);
283 std::string Path::getFilename(const std::string &path)
285 size_t pos = path.find_last_of(cDirSeparators);
286 if (pos == std::string::npos)
290 return path.substr(pos+1);
293 bool Path::hasExtension(const std::string &path)
295 return getFilename(path).find('.') != std::string::npos;
298 std::string Path::stripExtension(const std::string &path)
300 size_t dirSeparatorPos = path.find_last_of(cDirSeparators);
301 size_t extPos = path.find_last_of('.');
302 if (extPos == std::string::npos
303 || (dirSeparatorPos != std::string::npos && extPos < dirSeparatorPos))
307 return path.substr(0, extPos);
310 std::string Path::concatenateBeforeExtension(const std::string &input, const std::string &stringToAdd)
313 size_t dirSeparatorPosition = input.find_last_of(cDirSeparators);
314 size_t extSeparatorPosition = input.find_last_of('.');
315 bool havePath = (dirSeparatorPosition != std::string::npos);
316 // Make sure that if there's an extension-separator character,
317 // that it follows the last path-separator character (if any),
318 // before we interpret it as an extension separator.
319 bool haveExtension = (extSeparatorPosition != std::string::npos &&
321 (extSeparatorPosition > dirSeparatorPosition))));
324 output = input + stringToAdd;
328 output = input.substr(0, extSeparatorPosition);
329 output += stringToAdd;
330 output += std::string(input, extSeparatorPosition);
335 std::string Path::normalize(const std::string &path)
337 std::string result(path);
338 if (DIR_SEPARATOR != '/')
340 std::replace(result.begin(), result.end(), '/', DIR_SEPARATOR);
345 const char *Path::stripSourcePrefix(const char *path)
347 const char *fallback = path;
348 const char *sep = path + std::strlen(path);
349 bool gromacsSubdirFound = false;
352 const char *prevSep = sep - 1;
353 while (prevSep >= path && !isDirSeparator(*prevSep))
357 const std::ptrdiff_t length = sep - prevSep - 1;
358 if (gromacsSubdirFound)
360 if (std::strncmp(prevSep + 1, "src", length) == 0)
366 if (std::strncmp(prevSep + 1, "gromacs", length) == 0
367 || std::strncmp(prevSep + 1, "programs", length) == 0
368 || std::strncmp(prevSep + 1, "testutils", length) == 0)
370 gromacsSubdirFound = true;
372 if (fallback == path)
374 fallback = prevSep + 1;
381 bool Path::exists(const char *path)
383 return gmx_fexist(path);
386 bool Path::exists(const std::string &path)
388 return exists(path.c_str());
391 std::string Path::getWorkingDirectory()
393 // TODO: Use exceptions instead of gmx_fatal().
394 char cwd[GMX_PATH_MAX];
395 gmx_getcwd(cwd, sizeof(cwd));
399 void Path::splitPathEnvironment(const std::string &pathEnv,
400 std::vector<std::string> *result)
406 separator = pathEnv.find(cPathSeparator, prevPos);
407 result->push_back(pathEnv.substr(prevPos, separator - prevPos));
408 prevPos = separator + 1;
410 while (separator != std::string::npos);
413 std::vector<std::string> Path::getExecutablePaths()
415 std::vector<std::string> result;
416 #if GMX_NATIVE_WINDOWS
417 // Add the local dir since it is not in the path on Windows.
418 result.push_back("");
420 const char *path = std::getenv("PATH");
423 splitPathEnvironment(path, &result);
428 std::string Path::resolveSymlinks(const std::string &path)
430 /* Does not fully resolve the path like realpath/boost::canonical would.
431 * It doesn't resolve path elements (including "." or ".."), but only
432 * resolves the entire path (it does that recursively). */
433 std::string result(path);
434 #if !GMX_NATIVE_WINDOWS
435 char buf[GMX_PATH_MAX];
437 while ((length = readlink(result.c_str(), buf, sizeof(buf)-1)) > 0)
446 result = join(getParentPath(result), buf);
453 /********************************************************************
457 void File::returnFalseOnError(const NotFoundInfo & /*info*/)
461 void File::throwOnError(const NotFoundInfo &info)
465 const std::string message
466 = formatString("Failed to access file '%s'.\n%s",
467 info.filename, info.message);
468 GMX_THROW_WITH_ERRNO(FileIOError(message), info.call, info.err);
472 void File::throwOnNotFound(const NotFoundInfo &info)
475 const std::string message
476 = formatString("File '%s' does not exist or is not accessible.\n%s",
477 info.filename, info.message);
478 GMX_THROW_WITH_ERRNO(InvalidInputError(message), info.call, info.err);
482 bool File::exists(const char *filename, NotFoundHandler onNotFound)
484 if (filename == nullptr)
488 FILE *test = std::fopen(filename, "r");
491 const bool wasError = (errno != ENOENT && errno != ENOTDIR);
492 NotFoundInfo info(filename, "The file could not be opened.",
493 "fopen", wasError, errno);
500 // Windows doesn't allow fopen of directory, so we don't need to check
502 #if !GMX_NATIVE_WINDOWS
504 int status = stat(filename, &st_buf);
507 NotFoundInfo info(filename, "File information could not be read.",
508 "stat", true, errno);
512 if (!S_ISREG(st_buf.st_mode))
514 NotFoundInfo info(filename, "The file is not a regular file.",
525 bool File::exists(const std::string &filename, NotFoundHandler onNotFound)
527 return exists(filename.c_str(), onNotFound);
530 /********************************************************************
534 int Directory::create(const char *path)
536 if (Directory::exists(path))
540 #if GMX_NATIVE_WINDOWS
543 if (mkdir(path, S_IRWXU | S_IRWXG | S_IROTH | S_IWOTH) != 0)
546 // TODO: Proper error handling.
553 int Directory::create(const std::string &path)
555 return create(path.c_str());
559 bool Directory::exists(const char *path)
562 if (stat(path, &info) != 0)
564 if (errno != ENOENT && errno != ENOTDIR)
566 // TODO: Proper error handling.
570 #if GMX_NATIVE_WINDOWS
571 return ((_S_IFDIR & info.st_mode) != 0);
573 return S_ISDIR(info.st_mode);
578 bool Directory::exists(const std::string &path)
580 return exists(path.c_str());