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37 * Implements functions in path.h.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_fileio
54 #ifdef GMX_NATIVE_WINDOWS
63 #include "gromacs/fileio/futil.h"
64 #include "gromacs/utility/exceptions.h"
65 #include "gromacs/utility/stringutil.h"
70 //! Directory separator to use when joining paths.
71 const char cDirSeparator = '/';
72 //! Directory separators to use when parsing paths.
73 const char cDirSeparators[] = "/\\";
74 /*! \var cPathSeparator
76 * Separator to use to split the PATH environment variable.
78 * When reading the PATH environment variable, Unix separates entries
79 * with colon, while windows uses semicolon.
81 #ifdef GMX_NATIVE_WINDOWS
82 const char cPathSeparator = ';';
84 const char cPathSeparator = ':';
87 //! Check whether a given character is a directory separator.
88 bool isDirSeparator(char chr)
90 return std::strchr(cDirSeparators, chr);
98 /********************************************************************
102 bool Path::containsDirectory(const std::string &path)
104 return path.find_first_of(cDirSeparators) != std::string::npos;
107 /* Check if the program name begins with "/" on unix/cygwin, or
108 * with "\" or "X:\" on windows. If not, the program name
109 * is relative to the current directory.
111 bool Path::isAbsolute(const char *path)
113 if (isDirSeparator(path[0]))
117 #ifdef GMX_NATIVE_WINDOWS
118 return path[0] != '\0' && path[1] == ':' && isDirSeparator(path[2]);
124 bool Path::isAbsolute(const std::string &path)
126 return isAbsolute(path.c_str());
129 #ifdef GMX_NATIVE_WINDOWS
132 struct handle_wrapper
135 handle_wrapper(HANDLE h)
139 if (handle != INVALID_HANDLE_VALUE)
141 ::CloseHandle(handle);
148 bool Path::isEquivalent(const std::string &path1, const std::string &path2)
150 //based on boost_1_56_0/libs/filesystem/src/operations.cpp under BSL
151 #ifdef GMX_NATIVE_WINDOWS
152 // Note well: Physical location on external media is part of the
153 // equivalence criteria. If there are no open handles, physical location
154 // can change due to defragmentation or other relocations. Thus handles
155 // must be held open until location information for both paths has
158 // p2 is done first, so any error reported is for p1
164 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
167 FILE_FLAG_BACKUP_SEMANTICS,
174 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
177 FILE_FLAG_BACKUP_SEMANTICS,
180 if (h1.handle == INVALID_HANDLE_VALUE
181 || h2.handle == INVALID_HANDLE_VALUE)
183 // if one is invalid and the other isn't, then they aren't equivalent,
184 // but if both are invalid then it is an error
185 if (h1.handle == INVALID_HANDLE_VALUE
186 && h2.handle == INVALID_HANDLE_VALUE)
188 GMX_THROW(FileIOError("Path::isEquivalent called with two invalid files"));
194 // at this point, both handles are known to be valid
196 BY_HANDLE_FILE_INFORMATION info1, info2;
198 if (!GetFileInformationByHandle(h1.handle, &info1))
200 GMX_THROW(FileIOError("Path::isEquivalent: GetFileInformationByHandle failed"));
203 if (!GetFileInformationByHandle(h2.handle, &info2))
205 GMX_THROW(FileIOError("Path::isEquivalent: GetFileInformationByHandle failed"));
208 // In theory, volume serial numbers are sufficient to distinguish between
209 // devices, but in practice VSN's are sometimes duplicated, so last write
210 // time and file size are also checked.
212 info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber
213 && info1.nFileIndexHigh == info2.nFileIndexHigh
214 && info1.nFileIndexLow == info2.nFileIndexLow
215 && info1.nFileSizeHigh == info2.nFileSizeHigh
216 && info1.nFileSizeLow == info2.nFileSizeLow
217 && info1.ftLastWriteTime.dwLowDateTime
218 == info2.ftLastWriteTime.dwLowDateTime
219 && info1.ftLastWriteTime.dwHighDateTime
220 == info2.ftLastWriteTime.dwHighDateTime;
223 int e2 = stat(path2.c_str(), &s2);
224 int e1 = stat(path1.c_str(), &s1);
226 if (e1 != 0 || e2 != 0)
228 // if one is invalid and the other isn't then they aren't equivalent,
229 // but if both are invalid then it is an error.
230 if (e1 != 0 && e2 != 0)
232 GMX_THROW_WITH_ERRNO(
233 FileIOError("Path::isEquivalent called with two invalid files"),
239 // both stats now known to be valid
240 return s1.st_dev == s2.st_dev && s1.st_ino == s2.st_ino
241 // According to the POSIX stat specs, "The st_ino and st_dev fields
242 // taken together uniquely identify the file within the system."
243 // Just to be sure, size and mod time are also checked.
244 && s1.st_size == s2.st_size && s1.st_mtime == s2.st_mtime;
248 std::string Path::join(const std::string &path1,
249 const std::string &path2)
251 // TODO: Remove extra separators if they are present in the input paths.
252 return path1 + cDirSeparator + path2;
256 std::string Path::join(const std::string &path1,
257 const std::string &path2,
258 const std::string &path3)
260 // TODO: Remove extra separators if they are present in the input paths.
261 return path1 + cDirSeparator + path2 + cDirSeparator + path3;
264 std::string Path::getParentPath(const std::string &path)
266 /* Expects that the path doesn't contain "." or "..". If used on a path for
267 * which this isn't guaranteed realpath needs to be called first. */
268 size_t pos = path.find_last_of(cDirSeparators);
269 if (pos == std::string::npos)
271 return std::string();
273 return path.substr(0, pos);
276 std::string Path::getFilename(const std::string &path)
278 size_t pos = path.find_last_of(cDirSeparators);
279 if (pos == std::string::npos)
283 return path.substr(pos+1);
286 std::string Path::normalize(const std::string &path)
288 std::string result(path);
289 if (DIR_SEPARATOR != '/')
291 std::replace(result.begin(), result.end(), '/', DIR_SEPARATOR);
296 bool Path::exists(const char *path)
298 return gmx_fexist(path);
301 bool Path::exists(const std::string &path)
303 return exists(path.c_str());
306 std::string Path::getWorkingDirectory()
308 // TODO: Use exceptions instead of gmx_fatal().
309 char cwd[GMX_PATH_MAX];
310 gmx_getcwd(cwd, sizeof(cwd));
314 void Path::splitPathEnvironment(const std::string &pathEnv,
315 std::vector<std::string> *result)
321 separator = pathEnv.find(cPathSeparator, prevPos);
322 result->push_back(pathEnv.substr(prevPos, separator - prevPos));
323 prevPos = separator + 1;
325 while (separator != std::string::npos);
328 std::vector<std::string> Path::getExecutablePaths()
330 std::vector<std::string> result;
331 #ifdef GMX_NATIVE_WINDOWS
332 // Add the local dir since it is not in the path on Windows.
333 result.push_back("");
335 const char *path = std::getenv("PATH");
338 splitPathEnvironment(path, &result);
343 std::string Path::resolveSymlinks(const std::string &path)
345 /* Does not fully resolve the path like realpath/boost::canonical would.
346 * It doesn't resolve path elements (including "." or ".."), but only
347 * resolves the entire path (it does that recursively). */
348 std::string result(path);
349 #ifndef GMX_NATIVE_WINDOWS
350 char buf[GMX_PATH_MAX];
352 while ((length = readlink(result.c_str(), buf, sizeof(buf)-1)) > 0)
361 result = join(getParentPath(result), buf);
369 /********************************************************************
373 int Directory::create(const char *path)
375 if (Directory::exists(path))
379 #ifdef GMX_NATIVE_WINDOWS
382 if (mkdir(path, S_IRWXU | S_IRWXG | S_IROTH | S_IWOTH) != 0)
385 // TODO: Proper error handling.
392 int Directory::create(const std::string &path)
394 return create(path.c_str());
398 bool Directory::exists(const char *path)
401 if (stat(path, &info) != 0)
403 if (errno != ENOENT && errno != ENOTDIR)
405 // TODO: Proper error handling.
409 #ifdef GMX_NATIVE_WINDOWS
410 return ((_S_IFDIR & info.st_mode) != 0);
412 return S_ISDIR(info.st_mode);
417 bool Directory::exists(const std::string &path)
419 return exists(path.c_str());