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llvm-project/llvm/lib/System/Win32/Path.inc

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//===- llvm/System/Linux/Path.cpp - Linux Path Implementation ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
// Modified by Henrik Bach to comply with at least MinGW.
// Ported to Win32 by Jeff Cohen.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Path class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Win32 code that
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
#include "Win32.h"
#include <malloc.h>
// We need to undo a macro defined in Windows.h, otherwise we won't compile:
#undef CopyFile
// Windows happily accepts either forward or backward slashes, though any path
// returned by a Win32 API will have backward slashes. As LLVM code basically
// assumes forward slashes are used, backward slashs are converted where they
// can be introduced into a path.
//
// Another invariant is that a path ends with a slash if and only if the path
// is a root directory. Any other use of a trailing slash is stripped. Unlike
// in Unix, Windows has a rather complicated notion of a root path and this
// invariant helps simply the code.
static void FlipBackSlashes(std::string& s) {
for (size_t i = 0; i < s.size(); i++)
if (s[i] == '\\')
s[i] = '/';
}
namespace llvm {
namespace sys {
bool
Path::isValid() const {
if (path.empty())
return false;
// If there is a colon, it must be the second character, preceded by a letter
// and followed by something.
size_t len = path.size();
size_t pos = path.rfind(':',len);
size_t rootslash = 0;
if (pos != std::string::npos) {
if (pos != 1 || !isalpha(path[0]) || len < 3)
return false;
rootslash = 2;
}
// Look for a UNC path, and if found adjust our notion of the root slash.
if (len > 3 && path[0] == '/' && path[1] == '/') {
rootslash = path.find('/', 2);
if (rootslash == std::string::npos)
rootslash = 0;
}
// Check for illegal characters.
if (path.find_first_of("\\<>\"|\001\002\003\004\005\006\007\010\011\012"
"\013\014\015\016\017\020\021\022\023\024\025\026"
"\027\030\031\032\033\034\035\036\037")
!= std::string::npos)
return false;
// Remove trailing slash, unless it's a root slash.
if (len > rootslash+1 && path[len-1] == '/')
path.erase(--len);
// Check each component for legality.
for (pos = 0; pos < len; ++pos) {
// A component may not end in a space.
if (path[pos] == ' ') {
if (path[pos+1] == '/' || path[pos+1] == '\0')
return false;
}
// A component may not end in a period.
if (path[pos] == '.') {
if (path[pos+1] == '/' || path[pos+1] == '\0') {
// Unless it is the pseudo-directory "."...
if (pos == 0 || path[pos-1] == '/' || path[pos-1] == ':')
return true;
// or "..".
if (pos > 0 && path[pos-1] == '.') {
if (pos == 1 || path[pos-2] == '/' || path[pos-2] == ':')
return true;
}
return false;
}
}
}
return true;
}
static Path *TempDirectory = NULL;
Path
Path::GetTemporaryDirectory() {
if (TempDirectory)
return *TempDirectory;
char pathname[MAX_PATH];
if (!GetTempPath(MAX_PATH, pathname))
throw std::string("Can't determine temporary directory");
Path result;
result.set(pathname);
// Append a subdirectory passed on our process id so multiple LLVMs don't
// step on each other's toes.
sprintf(pathname, "LLVM_%u", GetCurrentProcessId());
result.appendComponent(pathname);
// If there's a directory left over from a previous LLVM execution that
// happened to have the same process id, get rid of it.
result.eraseFromDisk(true);
// And finally (re-)create the empty directory.
result.createDirectoryOnDisk(false);
TempDirectory = new Path(result);
return *TempDirectory;
}
Path::Path(const std::string& unverified_path)
: path(unverified_path)
{
FlipBackSlashes(path);
if (unverified_path.empty())
return;
if (this->isValid())
return;
// oops, not valid.
path.clear();
throw std::string(unverified_path + ": path is not valid");
}
// FIXME: the following set of functions don't map to Windows very well.
Path
Path::GetRootDirectory() {
Path result;
result.set("C:/");
return result;
}
static void getPathList(const char*path, std::vector<sys::Path>& Paths) {
const char* at = path;
const char* delim = strchr(at, ';');
Path tmpPath;
while (delim != 0) {
std::string tmp(at, size_t(delim-at));
if (tmpPath.set(tmp))
if (tmpPath.canRead())
Paths.push_back(tmpPath);
at = delim + 1;
delim = strchr(at, ';');
}
if (*at != 0)
if (tmpPath.set(std::string(at)))
if (tmpPath.canRead())
Paths.push_back(tmpPath);
}
void
Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
Paths.push_back(sys::Path("C:/WINDOWS/SYSTEM32"));
Paths.push_back(sys::Path("C:/WINDOWS"));
}
void
Path::GetBytecodeLibraryPaths(std::vector<sys::Path>& Paths) {
char * env_var = getenv("LLVM_LIB_SEARCH_PATH");
if (env_var != 0) {
getPathList(env_var,Paths);
}
#ifdef LLVM_LIBDIR
{
Path tmpPath;
if (tmpPath.set(LLVM_LIBDIR))
if (tmpPath.canRead())
Paths.push_back(tmpPath);
}
#endif
GetSystemLibraryPaths(Paths);
}
Path
Path::GetLLVMDefaultConfigDir() {
// TODO: this isn't going to fly on Windows
return Path("/etc/llvm");
}
Path
Path::GetUserHomeDirectory() {
// TODO: Typical Windows setup doesn't define HOME.
const char* home = getenv("HOME");
if (home) {
Path result;
if (result.set(home))
return result;
}
return GetRootDirectory();
}
// FIXME: the above set of functions don't map to Windows very well.
bool
Path::isFile() const {
WIN32_FILE_ATTRIBUTE_DATA fi;
BOOL rc = GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi);
if (rc)
return !(fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
else if (GetLastError() != ERROR_NOT_FOUND)
ThrowError(std::string(path) + ": Can't get status: ");
return false;
}
bool
Path::isDirectory() const {
WIN32_FILE_ATTRIBUTE_DATA fi;
BOOL rc = GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi);
if (rc)
return fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
else if (GetLastError() != ERROR_NOT_FOUND)
ThrowError(std::string(path) + ": Can't get status: ");
return false;
}
bool
Path::isHidden() const {
WIN32_FILE_ATTRIBUTE_DATA fi;
BOOL rc = GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi);
if (rc)
return fi.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN;
else if (GetLastError() != ERROR_NOT_FOUND)
ThrowError(std::string(path) + ": Can't get status: ");
return false;
}
bool
Path::isRootDirectory() const {
size_t len = path.size();
return len > 0 && path[len-1] == '/';
}
std::string
Path::getBasename() const {
// Find the last slash
size_t slash = path.rfind('/');
if (slash == std::string::npos)
slash = 0;
else
slash++;
size_t dot = path.rfind('.');
if (dot == std::string::npos || dot < slash)
return path.substr(slash);
else
return path.substr(slash, dot - slash);
}
bool Path::hasMagicNumber(const std::string &Magic) const {
std::string actualMagic;
if (getMagicNumber(actualMagic, Magic.size()))
return Magic == actualMagic;
return false;
}
bool
Path::isBytecodeFile() const {
if (!isFile())
return false;
std::string actualMagic;
if (!getMagicNumber(actualMagic, 4))
return false;
return actualMagic == "llvc" || actualMagic == "llvm";
}
bool
Path::exists() const {
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::canRead() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::canWrite() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return (attr != INVALID_FILE_ATTRIBUTES) && !(attr & FILE_ATTRIBUTE_READONLY);
}
bool
Path::canExecute() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
std::string
Path::getLast() const {
// Find the last slash
size_t pos = path.rfind('/');
// Handle the corner cases
if (pos == std::string::npos)
return path;
// If the last character is a slash, we have a root directory
if (pos == path.length()-1)
return path;
// Return everything after the last slash
return path.substr(pos+1);
}
void
Path::getStatusInfo(StatusInfo& info) const {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
ThrowError(std::string(path) + ": Can't get status: ");
info.fileSize = fi.nFileSizeHigh;
info.fileSize <<= 32;
info.fileSize += fi.nFileSizeLow;
info.mode = fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0555 : 0777;
info.user = 9999; // Not applicable to Windows, so...
info.group = 9999; // Not applicable to Windows, so...
__int64 ft = *reinterpret_cast<__int64*>(&fi.ftLastWriteTime);
info.modTime.fromWin32Time(ft);
info.isDir = fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
}
static bool AddPermissionBits(const std::string& Filename, int bits) {
DWORD attr = GetFileAttributes(Filename.c_str());
// If it doesn't exist, we're done.
if (attr == INVALID_FILE_ATTRIBUTES)
return false;
// The best we can do to interpret Unix permission bits is to use
// the owner writable bit.
if ((attr & FILE_ATTRIBUTE_READONLY) && (bits & 0200)) {
if (!SetFileAttributes(Filename.c_str(), attr & ~FILE_ATTRIBUTE_READONLY))
ThrowError(Filename + ": SetFileAttributes: ");
}
return true;
}
void Path::makeReadableOnDisk() {
// All files are readable on Windows (ignoring security attributes).
}
void Path::makeWriteableOnDisk() {
DWORD attr = GetFileAttributes(path.c_str());
// If it doesn't exist, we're done.
if (attr == INVALID_FILE_ATTRIBUTES)
return;
if (attr & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(), attr & ~FILE_ATTRIBUTE_READONLY))
ThrowError(std::string(path) + ": Can't make file writable: ");
}
}
void Path::makeExecutableOnDisk() {
// All files are executable on Windows (ignoring security attributes).
}
bool
Path::getDirectoryContents(std::set<Path>& result) const {
if (!isDirectory())
return false;
result.clear();
WIN32_FIND_DATA fd;
std::string searchpath = path;
if (path.size() == 0 || searchpath[path.size()-1] == '/')
searchpath += "*";
else
searchpath += "/*";
HANDLE h = FindFirstFile(searchpath.c_str(), &fd);
if (h == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_FILE_NOT_FOUND)
return true; // not really an error, now is it?
ThrowError(path + ": Can't read directory: ");
}
do {
if (fd.cFileName[0] == '.')
continue;
Path aPath(path);
aPath.appendComponent(&fd.cFileName[0]);
result.insert(aPath);
} while (FindNextFile(h, &fd));
DWORD err = GetLastError();
FindClose(h);
if (err != ERROR_NO_MORE_FILES) {
SetLastError(err);
ThrowError(path + ": Can't read directory: ");
}
return true;
}
bool
Path::set(const std::string& a_path) {
if (a_path.size() == 0)
return false;
std::string save(path);
path = a_path;
FlipBackSlashes(path);
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::appendComponent(const std::string& name) {
if (name.empty())
return false;
std::string save(path);
if (!path.empty()) {
size_t last = path.size() - 1;
if (path[last] != '/')
path += '/';
}
path += name;
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::eraseComponent() {
size_t slashpos = path.rfind('/',path.size());
if (slashpos == path.size() - 1 || slashpos == std::string::npos)
return false;
std::string save(path);
path.erase(slashpos);
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::appendSuffix(const std::string& suffix) {
std::string save(path);
path.append(".");
path.append(suffix);
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::eraseSuffix() {
size_t dotpos = path.rfind('.',path.size());
size_t slashpos = path.rfind('/',path.size());
if (dotpos != std::string::npos) {
if (slashpos == std::string::npos || dotpos > slashpos+1) {
std::string save(path);
path.erase(dotpos, path.size()-dotpos);
if (!isValid()) {
path = save;
return false;
}
return true;
}
}
return false;
}
bool
Path::createDirectoryOnDisk(bool create_parents) {
// Get a writeable copy of the path name
size_t len = path.length();
char *pathname = reinterpret_cast<char *>(_alloca(len+2));
path.copy(pathname, len);
pathname[len] = 0;
// Make sure it ends with a slash.
if (len == 0 || pathname[len - 1] != '/') {
pathname[len] = '/';
pathname[++len] = 0;
}
// Determine starting point for initial / search.
char *next = pathname;
if (pathname[0] == '/' && pathname[1] == '/') {
// Skip host name.
next = strchr(pathname+2, '/');
if (next == NULL)
throw std::string(pathname) + ": badly formed remote directory";
// Skip share name.
next = strchr(next+1, '/');
if (next == NULL)
throw std::string(pathname) + ": badly formed remote directory";
next++;
if (*next == 0)
throw std::string(pathname) + ": badly formed remote directory";
} else {
if (pathname[1] == ':')
next += 2; // skip drive letter
if (*next == '/')
next++; // skip root directory
}
// If we're supposed to create intermediate directories
if (create_parents) {
// Loop through the directory components until we're done
while (*next) {
next = strchr(next, '/');
*next = 0;
if (!CreateDirectory(pathname, NULL))
ThrowError(std::string(pathname) + ": Can't create directory: ");
*next++ = '/';
}
} else {
// Drop trailing slash.
pathname[len-1] = 0;
if (!CreateDirectory(pathname, NULL)) {
ThrowError(std::string(pathname) + ": Can't create directory: ");
}
}
return true;
}
bool
Path::createFileOnDisk() {
// Create the file
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE)
ThrowError(path + ": Can't create file: ");
CloseHandle(h);
return true;
}
bool
Path::eraseFromDisk(bool remove_contents) const {
if (isFile()) {
DWORD attr = GetFileAttributes(path.c_str());
// If it doesn't exist, we're done.
if (attr == INVALID_FILE_ATTRIBUTES)
return true;
// Read-only files cannot be deleted on Windows. Must remove the read-only
// attribute first.
if (attr & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(), attr & ~FILE_ATTRIBUTE_READONLY))
ThrowError(path + ": Can't destroy file: ");
}
if (!DeleteFile(path.c_str()))
ThrowError(path + ": Can't destroy file: ");
return true;
} else if (isDirectory()) {
// If it doesn't exist, we're done.
if (!exists())
return true;
char *pathname = reinterpret_cast<char *>(_alloca(path.length()+3));
int lastchar = path.length() - 1 ;
path.copy(pathname, lastchar+1);
// Make path end with '/*'.
if (pathname[lastchar] != '/')
pathname[++lastchar] = '/';
pathname[lastchar+1] = '*';
pathname[lastchar+2] = 0;
if (remove_contents) {
WIN32_FIND_DATA fd;
HANDLE h = FindFirstFile(pathname, &fd);
// It's a bad idea to alter the contents of a directory while enumerating
// its contents. So build a list of its contents first, then destroy them.
if (h != INVALID_HANDLE_VALUE) {
std::vector<Path> list;
do {
if (strcmp(fd.cFileName, ".") == 0)
continue;
if (strcmp(fd.cFileName, "..") == 0)
continue;
Path aPath(path);
aPath.appendComponent(&fd.cFileName[0]);
list.push_back(aPath);
} while (FindNextFile(h, &fd));
DWORD err = GetLastError();
FindClose(h);
if (err != ERROR_NO_MORE_FILES) {
SetLastError(err);
ThrowError(path + ": Can't read directory: ");
}
for (std::vector<Path>::iterator I = list.begin(); I != list.end();
++I) {
Path &aPath = *I;
aPath.eraseFromDisk(true);
}
} else {
if (GetLastError() != ERROR_FILE_NOT_FOUND)
ThrowError(path + ": Can't read directory: ");
}
}
pathname[lastchar] = 0;
if (!RemoveDirectory(pathname))
ThrowError(std::string(pathname) + ": Can't destroy directory: ");
return true;
} else {
// It appears the path doesn't exist.
return false;
}
}
bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile())
return false;
assert(len < 1024 && "Request for magic string too long");
char* buf = (char*) alloca(1 + len);
HANDLE h = CreateFile(path.c_str(),
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (h == INVALID_HANDLE_VALUE)
return false;
DWORD nRead = 0;
BOOL ret = ReadFile(h, buf, len, &nRead, NULL);
CloseHandle(h);
if (!ret || nRead != len)
return false;
buf[len] = '\0';
Magic = buf;
return true;
}
bool
Path::renamePathOnDisk(const Path& newName) {
if (!MoveFile(path.c_str(), newName.c_str()))
ThrowError("Can't move '" + path +
"' to '" + newName.path + "': ");
return true;
}
bool
Path::setStatusInfoOnDisk(const StatusInfo& si) const {
// FIXME: should work on directories also.
if (!isFile()) return false;
HANDLE h = CreateFile(path.c_str(),
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 false;
BY_HANDLE_FILE_INFORMATION bhfi;
if (!GetFileInformationByHandle(h, &bhfi)) {
DWORD err = GetLastError();
CloseHandle(h);
SetLastError(err);
ThrowError(path + ": GetFileInformationByHandle: ");
}
FILETIME ft;
(uint64_t&)ft = si.modTime.toWin32Time();
BOOL ret = SetFileTime(h, NULL, &ft, &ft);
DWORD err = GetLastError();
CloseHandle(h);
if (!ret) {
SetLastError(err);
ThrowError(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))
ThrowError(path + ": SetFileAttributes: ");
}
} else {
if (!(bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY)) {
if (!SetFileAttributes(path.c_str(),
bhfi.dwFileAttributes | FILE_ATTRIBUTE_READONLY))
ThrowError(path + ": SetFileAttributes: ");
}
}
return true;
}
void
sys::CopyFile(const sys::Path &Dest, const sys::Path &Src) {
// Can't use CopyFile macro defined in Windows.h because it would mess up the
// above line. We use the expansion it would have in a non-UNICODE build.
if (!::CopyFileA(Src.c_str(), Dest.c_str(), false))
ThrowError("Can't copy '" + Src.toString() +
"' to '" + Dest.toString() + "': ");
}
void
Path::makeUnique(bool reuse_current) {
if (reuse_current && !exists())
return; // 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 unsigned FCounter = 0;
do {
sprintf(FNBuffer+offset, "-%06u", FCounter);
if (++FCounter > 999999)
FCounter = 0;
path = FNBuffer;
} while (exists());
}
bool
Path::createTemporaryFileOnDisk(bool reuse_current) {
// Make this into a unique file name
makeUnique(reuse_current);
// 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 false;
CloseHandle(h);
return true;
}
}
}
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