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632 lines
18 KiB
C++
632 lines
18 KiB
C++
//===- llvm/Support/Win32/Path.cpp - Win32 Path Implementation ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the Win32 specific implementation of the Path class.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic Win32 code that
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//=== is guaranteed to work on *all* Win32 variants.
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//===----------------------------------------------------------------------===//
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#include "Windows.h"
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#include <cstdio>
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#include <malloc.h>
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// We need to undo a macro defined in Windows.h, otherwise we won't compile:
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#undef GetCurrentDirectory
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// Windows happily accepts either forward or backward slashes, though any path
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// returned by a Win32 API will have backward slashes. As LLVM code basically
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// assumes forward slashes are used, backward slashs are converted where they
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// can be introduced into a path.
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//
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// Another invariant is that a path ends with a slash if and only if the path
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// is a root directory. Any other use of a trailing slash is stripped. Unlike
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// in Unix, Windows has a rather complicated notion of a root path and this
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// invariant helps simply the code.
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static void FlipBackSlashes(std::string& s) {
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for (size_t i = 0; i < s.size(); i++)
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if (s[i] == '\\')
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s[i] = '/';
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}
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namespace llvm {
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namespace sys {
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const char PathSeparator = ';';
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StringRef Path::GetEXESuffix() {
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return "exe";
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}
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Path::Path(llvm::StringRef p)
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: path(p) {
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FlipBackSlashes(path);
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}
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Path::Path(const char *StrStart, unsigned StrLen)
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: path(StrStart, StrLen) {
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FlipBackSlashes(path);
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}
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Path&
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Path::operator=(StringRef that) {
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path.assign(that.data(), that.size());
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FlipBackSlashes(path);
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return *this;
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}
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bool
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Path::isValid() const {
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if (path.empty())
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return false;
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size_t len = path.size();
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// If there is a null character, it and all its successors are ignored.
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size_t pos = path.find_first_of('\0');
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if (pos != std::string::npos)
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len = pos;
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// If there is a colon, it must be the second character, preceded by a letter
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// and followed by something.
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pos = path.rfind(':',len);
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size_t rootslash = 0;
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if (pos != std::string::npos) {
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if (pos != 1 || !isalpha(static_cast<unsigned char>(path[0])) || len < 3)
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return false;
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rootslash = 2;
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}
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// Look for a UNC path, and if found adjust our notion of the root slash.
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if (len > 3 && path[0] == '/' && path[1] == '/') {
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rootslash = path.find('/', 2);
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if (rootslash == std::string::npos)
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rootslash = 0;
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}
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// Check for illegal characters.
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if (path.find_first_of("\\<>\"|\001\002\003\004\005\006\007\010\011\012"
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"\013\014\015\016\017\020\021\022\023\024\025\026"
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"\027\030\031\032\033\034\035\036\037")
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!= std::string::npos)
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return false;
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// Remove trailing slash, unless it's a root slash.
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if (len > rootslash+1 && path[len-1] == '/')
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path.erase(--len);
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// Check each component for legality.
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for (pos = 0; pos < len; ++pos) {
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// A component may not end in a space.
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if (path[pos] == ' ') {
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if (pos+1 == len || path[pos+1] == '/' || path[pos+1] == '\0')
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return false;
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}
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// A component may not end in a period.
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if (path[pos] == '.') {
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if (pos+1 == len || path[pos+1] == '/') {
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// Unless it is the pseudo-directory "."...
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if (pos == 0 || path[pos-1] == '/' || path[pos-1] == ':')
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return true;
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// or "..".
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if (pos > 0 && path[pos-1] == '.') {
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if (pos == 1 || path[pos-2] == '/' || path[pos-2] == ':')
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return true;
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}
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return false;
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}
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}
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}
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return true;
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}
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void Path::makeAbsolute() {
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TCHAR FullPath[MAX_PATH + 1] = {0};
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LPTSTR FilePart = NULL;
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DWORD RetLength = ::GetFullPathNameA(path.c_str(),
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sizeof(FullPath)/sizeof(FullPath[0]),
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FullPath, &FilePart);
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if (0 == RetLength) {
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// FIXME: Report the error GetLastError()
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assert(0 && "Unable to make absolute path!");
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} else if (RetLength > MAX_PATH) {
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// FIXME: Report too small buffer (needed RetLength bytes).
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assert(0 && "Unable to make absolute path!");
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} else {
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path = FullPath;
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}
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}
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static Path *TempDirectory;
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Path
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Path::GetTemporaryDirectory(std::string* ErrMsg) {
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if (TempDirectory) {
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#if defined(_MSC_VER)
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// Visual Studio gets confused and emits a diagnostic about calling exists,
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// even though this is the implementation for PathV1. Temporarily
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// disable the deprecated warning message
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#pragma warning(push)
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#pragma warning(disable:4996)
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#endif
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assert(TempDirectory->exists() && "Who has removed TempDirectory?");
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#if defined(_MSC_VER)
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#pragma warning(pop)
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#endif
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return *TempDirectory;
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}
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char pathname[MAX_PATH];
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if (!GetTempPath(MAX_PATH, pathname)) {
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if (ErrMsg)
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*ErrMsg = "Can't determine temporary directory";
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return Path();
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}
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Path result;
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result.set(pathname);
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// Append a subdirectory based on our process id so multiple LLVMs don't
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// step on each other's toes.
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#ifdef __MINGW32__
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// Mingw's Win32 header files are broken.
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sprintf(pathname, "LLVM_%u", unsigned(GetCurrentProcessId()));
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#else
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sprintf(pathname, "LLVM_%u", GetCurrentProcessId());
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#endif
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result.appendComponent(pathname);
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// If there's a directory left over from a previous LLVM execution that
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// happened to have the same process id, get rid of it.
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result.eraseFromDisk(true);
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// And finally (re-)create the empty directory.
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result.createDirectoryOnDisk(false);
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TempDirectory = new Path(result);
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return *TempDirectory;
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}
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Path
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Path::GetCurrentDirectory() {
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char pathname[MAX_PATH];
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::GetCurrentDirectoryA(MAX_PATH,pathname);
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return Path(pathname);
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}
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/// GetMainExecutable - Return the path to the main executable, given the
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/// value of argv[0] from program startup.
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Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
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char pathname[MAX_PATH];
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DWORD ret = ::GetModuleFileNameA(NULL, pathname, MAX_PATH);
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return ret != MAX_PATH ? Path(pathname) : Path();
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}
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// FIXME: the above set of functions don't map to Windows very well.
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bool
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Path::exists() const {
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DWORD attr = GetFileAttributes(path.c_str());
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return attr != INVALID_FILE_ATTRIBUTES;
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}
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bool
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Path::isDirectory() const {
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DWORD attr = GetFileAttributes(path.c_str());
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return (attr != INVALID_FILE_ATTRIBUTES) &&
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(attr & FILE_ATTRIBUTE_DIRECTORY);
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}
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bool
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Path::isSymLink() const {
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DWORD attributes = GetFileAttributes(path.c_str());
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if (attributes == INVALID_FILE_ATTRIBUTES)
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// There's no sane way to report this :(.
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assert(0 && "GetFileAttributes returned INVALID_FILE_ATTRIBUTES");
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// This isn't exactly what defines a NTFS symlink, but it is only true for
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// paths that act like a symlink.
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return attributes & FILE_ATTRIBUTE_REPARSE_POINT;
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}
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bool
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Path::isRegularFile() const {
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bool res;
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if (fs::is_regular_file(path, res))
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return false;
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return res;
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}
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const FileStatus *
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PathWithStatus::getFileStatus(bool update, std::string *ErrStr) const {
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if (!fsIsValid || update) {
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WIN32_FILE_ATTRIBUTE_DATA fi;
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if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
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MakeErrMsg(ErrStr, "getStatusInfo():" + std::string(path) +
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": Can't get status: ");
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return 0;
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}
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status.fileSize = fi.nFileSizeHigh;
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status.fileSize <<= sizeof(fi.nFileSizeHigh)*8;
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status.fileSize += fi.nFileSizeLow;
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status.mode = fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0555 : 0777;
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status.user = 9999; // Not applicable to Windows, so...
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status.group = 9999; // Not applicable to Windows, so...
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ULARGE_INTEGER ui;
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ui.LowPart = fi.ftLastWriteTime.dwLowDateTime;
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ui.HighPart = fi.ftLastWriteTime.dwHighDateTime;
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status.modTime.fromWin32Time(ui.QuadPart);
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status.isDir = fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
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fsIsValid = true;
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}
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return &status;
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}
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bool Path::makeReadableOnDisk(std::string* ErrMsg) {
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// All files are readable on Windows (ignoring security attributes).
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return false;
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}
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bool Path::makeWriteableOnDisk(std::string* ErrMsg) {
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DWORD attr = GetFileAttributes(path.c_str());
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// If it doesn't exist, we're done.
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if (attr == INVALID_FILE_ATTRIBUTES)
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return false;
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if (attr & FILE_ATTRIBUTE_READONLY) {
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if (!SetFileAttributes(path.c_str(), attr & ~FILE_ATTRIBUTE_READONLY)) {
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MakeErrMsg(ErrMsg, std::string(path) + ": Can't make file writable: ");
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return true;
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}
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}
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return false;
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}
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bool
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Path::set(StringRef a_path) {
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if (a_path.empty())
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return false;
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std::string save(path);
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path = a_path;
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FlipBackSlashes(path);
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if (!isValid()) {
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path = save;
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return false;
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}
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return true;
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}
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bool
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Path::appendComponent(StringRef name) {
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if (name.empty())
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return false;
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std::string save(path);
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if (!path.empty()) {
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size_t last = path.size() - 1;
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if (path[last] != '/')
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path += '/';
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}
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path += name;
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if (!isValid()) {
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path = save;
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return false;
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}
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return true;
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}
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bool
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Path::eraseComponent() {
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos == path.size() - 1 || slashpos == std::string::npos)
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return false;
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std::string save(path);
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path.erase(slashpos);
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if (!isValid()) {
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path = save;
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return false;
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}
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return true;
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}
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bool
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Path::eraseSuffix() {
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size_t dotpos = path.rfind('.',path.size());
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size_t slashpos = path.rfind('/',path.size());
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if (dotpos != std::string::npos) {
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if (slashpos == std::string::npos || dotpos > slashpos+1) {
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std::string save(path);
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path.erase(dotpos, path.size()-dotpos);
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if (!isValid()) {
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path = save;
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return false;
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}
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return true;
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}
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}
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return false;
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}
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inline bool PathMsg(std::string* ErrMsg, const char* pathname, const char*msg) {
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if (ErrMsg)
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*ErrMsg = std::string(pathname) + ": " + std::string(msg);
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return true;
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}
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bool
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Path::createDirectoryOnDisk(bool create_parents, std::string* ErrMsg) {
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// Get a writeable copy of the path name
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size_t len = path.length();
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char *pathname = reinterpret_cast<char *>(_alloca(len+2));
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path.copy(pathname, len);
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pathname[len] = 0;
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// Make sure it ends with a slash.
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if (len == 0 || pathname[len - 1] != '/') {
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pathname[len] = '/';
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pathname[++len] = 0;
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}
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// Determine starting point for initial / search.
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char *next = pathname;
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if (pathname[0] == '/' && pathname[1] == '/') {
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// Skip host name.
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next = strchr(pathname+2, '/');
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if (next == NULL)
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return PathMsg(ErrMsg, pathname, "badly formed remote directory");
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// Skip share name.
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next = strchr(next+1, '/');
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if (next == NULL)
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return PathMsg(ErrMsg, pathname,"badly formed remote directory");
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next++;
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if (*next == 0)
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return PathMsg(ErrMsg, pathname, "badly formed remote directory");
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} else {
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if (pathname[1] == ':')
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next += 2; // skip drive letter
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if (*next == '/')
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next++; // skip root directory
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}
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// If we're supposed to create intermediate directories
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if (create_parents) {
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// Loop through the directory components until we're done
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while (*next) {
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next = strchr(next, '/');
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*next = 0;
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if (!CreateDirectory(pathname, NULL) &&
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GetLastError() != ERROR_ALREADY_EXISTS)
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return MakeErrMsg(ErrMsg,
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std::string(pathname) + ": Can't create directory: ");
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*next++ = '/';
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}
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} else {
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// Drop trailing slash.
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pathname[len-1] = 0;
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if (!CreateDirectory(pathname, NULL) &&
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GetLastError() != ERROR_ALREADY_EXISTS) {
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return MakeErrMsg(ErrMsg, std::string(pathname) +
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": Can't create directory: ");
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}
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}
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return false;
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}
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bool
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Path::eraseFromDisk(bool remove_contents, std::string *ErrStr) const {
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WIN32_FILE_ATTRIBUTE_DATA fi;
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if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
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return true;
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if (fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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// If it doesn't exist, we're done.
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bool Exists;
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if (fs::exists(path, Exists) || !Exists)
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return false;
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char *pathname = reinterpret_cast<char *>(_alloca(path.length()+3));
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int lastchar = path.length() - 1 ;
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path.copy(pathname, lastchar+1);
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// Make path end with '/*'.
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if (pathname[lastchar] != '/')
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pathname[++lastchar] = '/';
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pathname[lastchar+1] = '*';
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pathname[lastchar+2] = 0;
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if (remove_contents) {
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WIN32_FIND_DATA fd;
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HANDLE h = FindFirstFile(pathname, &fd);
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// It's a bad idea to alter the contents of a directory while enumerating
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// its contents. So build a list of its contents first, then destroy them.
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if (h != INVALID_HANDLE_VALUE) {
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std::vector<Path> list;
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do {
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if (strcmp(fd.cFileName, ".") == 0)
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continue;
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if (strcmp(fd.cFileName, "..") == 0)
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continue;
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Path aPath(path);
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aPath.appendComponent(&fd.cFileName[0]);
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list.push_back(aPath);
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} while (FindNextFile(h, &fd));
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DWORD err = GetLastError();
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FindClose(h);
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if (err != ERROR_NO_MORE_FILES) {
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SetLastError(err);
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return MakeErrMsg(ErrStr, path + ": Can't read directory: ");
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}
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for (std::vector<Path>::iterator I = list.begin(); I != list.end();
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++I) {
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Path &aPath = *I;
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aPath.eraseFromDisk(true);
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}
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} else {
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if (GetLastError() != ERROR_FILE_NOT_FOUND)
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return MakeErrMsg(ErrStr, path + ": Can't read directory: ");
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}
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}
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pathname[lastchar] = 0;
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if (!RemoveDirectory(pathname))
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return MakeErrMsg(ErrStr,
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std::string(pathname) + ": Can't destroy directory: ");
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return false;
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} else {
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// Read-only files cannot be deleted on Windows. Must remove the read-only
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// attribute first.
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if (fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
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if (!SetFileAttributes(path.c_str(),
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fi.dwFileAttributes & ~FILE_ATTRIBUTE_READONLY))
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return MakeErrMsg(ErrStr, path + ": Can't destroy file: ");
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}
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if (!DeleteFile(path.c_str()))
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return MakeErrMsg(ErrStr, path + ": Can't destroy file: ");
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return false;
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}
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}
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bool
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Path::renamePathOnDisk(const Path& newName, std::string* ErrMsg) {
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if (!MoveFileEx(path.c_str(), newName.c_str(), MOVEFILE_REPLACE_EXISTING))
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return MakeErrMsg(ErrMsg, "Can't move '" + path + "' to '" + newName.path
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+ "': ");
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return false;
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}
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bool
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Path::setStatusInfoOnDisk(const FileStatus &si, std::string *ErrMsg) const {
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// FIXME: should work on directories also.
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if (!si.isFile) {
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return true;
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}
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HANDLE h = CreateFile(path.c_str(),
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|
FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
|
|
NULL,
|
|
OPEN_EXISTING,
|
|
FILE_ATTRIBUTE_NORMAL,
|
|
NULL);
|
|
if (h == INVALID_HANDLE_VALUE)
|
|
return true;
|
|
|
|
BY_HANDLE_FILE_INFORMATION bhfi;
|
|
if (!GetFileInformationByHandle(h, &bhfi)) {
|
|
DWORD err = GetLastError();
|
|
CloseHandle(h);
|
|
SetLastError(err);
|
|
return MakeErrMsg(ErrMsg, path + ": GetFileInformationByHandle: ");
|
|
}
|
|
|
|
ULARGE_INTEGER ui;
|
|
ui.QuadPart = si.modTime.toWin32Time();
|
|
FILETIME ft;
|
|
ft.dwLowDateTime = ui.LowPart;
|
|
ft.dwHighDateTime = ui.HighPart;
|
|
BOOL ret = SetFileTime(h, NULL, &ft, &ft);
|
|
DWORD err = GetLastError();
|
|
CloseHandle(h);
|
|
if (!ret) {
|
|
SetLastError(err);
|
|
return MakeErrMsg(ErrMsg, path + ": SetFileTime: ");
|
|
}
|
|
|
|
// Best we can do with Unix permission bits is to interpret the owner
|
|
// writable bit.
|
|
if (si.mode & 0200) {
|
|
if (bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
|
|
if (!SetFileAttributes(path.c_str(),
|
|
bhfi.dwFileAttributes & ~FILE_ATTRIBUTE_READONLY))
|
|
return MakeErrMsg(ErrMsg, path + ": SetFileAttributes: ");
|
|
}
|
|
} else {
|
|
if (!(bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY)) {
|
|
if (!SetFileAttributes(path.c_str(),
|
|
bhfi.dwFileAttributes | FILE_ATTRIBUTE_READONLY))
|
|
return MakeErrMsg(ErrMsg, path + ": SetFileAttributes: ");
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Path::makeUnique(bool reuse_current, std::string* ErrMsg) {
|
|
bool Exists;
|
|
if (reuse_current && (fs::exists(path, Exists) || !Exists))
|
|
return false; // File doesn't exist already, just use it!
|
|
|
|
// Reserve space for -XXXXXX at the end.
|
|
char *FNBuffer = (char*) alloca(path.size()+8);
|
|
unsigned offset = path.size();
|
|
path.copy(FNBuffer, offset);
|
|
|
|
// Find a numeric suffix that isn't used by an existing file. Assume there
|
|
// won't be more than 1 million files with the same prefix. Probably a safe
|
|
// bet.
|
|
static int FCounter = -1;
|
|
if (FCounter < 0) {
|
|
// Give arbitrary initial seed.
|
|
// FIXME: We should use sys::fs::unique_file() in future.
|
|
LARGE_INTEGER cnt64;
|
|
DWORD x = GetCurrentProcessId();
|
|
x = (x << 16) | (x >> 16);
|
|
if (QueryPerformanceCounter(&cnt64)) // RDTSC
|
|
x ^= cnt64.HighPart ^ cnt64.LowPart;
|
|
FCounter = x % 1000000;
|
|
}
|
|
do {
|
|
sprintf(FNBuffer+offset, "-%06u", FCounter);
|
|
if (++FCounter > 999999)
|
|
FCounter = 0;
|
|
path = FNBuffer;
|
|
} while (!fs::exists(path, Exists) && Exists);
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Path::createTemporaryFileOnDisk(bool reuse_current, std::string* ErrMsg) {
|
|
// Make this into a unique file name
|
|
makeUnique(reuse_current, ErrMsg);
|
|
|
|
// Now go and create it
|
|
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, NULL, CREATE_NEW,
|
|
FILE_ATTRIBUTE_NORMAL, NULL);
|
|
if (h == INVALID_HANDLE_VALUE)
|
|
return MakeErrMsg(ErrMsg, path + ": can't create file");
|
|
|
|
CloseHandle(h);
|
|
return false;
|
|
}
|
|
}
|
|
}
|