mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-20 00:51:42 +00:00
Prepare wpiutil for merge into allwpilib.
This commit is contained in:
Peter Johnson
390
wpiutil/src/main/native/cpp/llvm/Unix/Path.inc
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390
wpiutil/src/main/native/cpp/llvm/Unix/Path.inc
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//===- llvm/Support/Unix/Path.inc - Unix 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 implements the Unix specific implementation of the Path API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#define NAMLEN(dirent) strlen((dirent)->d_name)
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#include <sys/param.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace llvm {
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namespace sys {
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namespace fs {
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UniqueID file_status::getUniqueID() const {
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return UniqueID(fs_st_dev, fs_st_ino);
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}
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std::error_code current_path(SmallVectorImpl<char> &result) {
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result.clear();
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const char *pwd = ::getenv("PWD");
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llvm::sys::fs::file_status PWDStatus, DotStatus;
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if (pwd && llvm::sys::path::is_absolute(pwd) &&
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!llvm::sys::fs::status(pwd, PWDStatus) &&
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!llvm::sys::fs::status(".", DotStatus) &&
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PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
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result.append(pwd, pwd + strlen(pwd));
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return std::error_code();
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}
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#ifdef MAXPATHLEN
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result.reserve(MAXPATHLEN);
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#else
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result.reserve(1024);
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#endif
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while (true) {
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if (::getcwd(result.data(), result.capacity()) == nullptr) {
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// See if there was a real error.
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if (errno != ENOMEM)
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return std::error_code(errno, std::generic_category());
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// Otherwise there just wasn't enough space.
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result.reserve(result.capacity() * 2);
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} else
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break;
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}
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result.set_size(strlen(result.data()));
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return std::error_code();
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}
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static int convertAccessMode(AccessMode Mode) {
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switch (Mode) {
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case AccessMode::Exist:
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return F_OK;
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case AccessMode::Write:
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return W_OK;
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case AccessMode::Execute:
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return R_OK | X_OK; // scripts also need R_OK.
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default:
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return F_OK;
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}
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}
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std::error_code access(const Twine &Path, AccessMode Mode) {
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SmallString<128> PathStorage;
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StringRef P = Path.toNullTerminatedStringRef(PathStorage);
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if (::access(P.begin(), convertAccessMode(Mode)) == -1)
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return std::error_code(errno, std::generic_category());
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if (Mode == AccessMode::Execute) {
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// Don't say that directories are executable.
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struct stat buf;
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if (0 != stat(P.begin(), &buf))
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return std::make_error_code(std::errc::permission_denied);
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if (!S_ISREG(buf.st_mode))
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return std::make_error_code(std::errc::permission_denied);
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}
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return std::error_code();
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}
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bool equivalent(file_status A, file_status B) {
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assert(status_known(A) && status_known(B));
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return A.fs_st_dev == B.fs_st_dev &&
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A.fs_st_ino == B.fs_st_ino;
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}
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std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
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file_status fsA, fsB;
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if (std::error_code ec = status(A, fsA))
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return ec;
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if (std::error_code ec = status(B, fsB))
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return ec;
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result = equivalent(fsA, fsB);
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return std::error_code();
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}
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static std::error_code fillStatus(int StatRet, const struct stat &Status,
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file_status &Result) {
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if (StatRet != 0) {
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std::error_code ec(errno, std::generic_category());
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if (ec == std::errc::no_such_file_or_directory)
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Result = file_status(file_type::file_not_found);
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else
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Result = file_status(file_type::status_error);
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return ec;
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}
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file_type Type = file_type::type_unknown;
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if (S_ISDIR(Status.st_mode))
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Type = file_type::directory_file;
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else if (S_ISREG(Status.st_mode))
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Type = file_type::regular_file;
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else if (S_ISBLK(Status.st_mode))
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Type = file_type::block_file;
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else if (S_ISCHR(Status.st_mode))
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Type = file_type::character_file;
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else if (S_ISFIFO(Status.st_mode))
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Type = file_type::fifo_file;
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else if (S_ISSOCK(Status.st_mode))
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Type = file_type::socket_file;
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else if (S_ISLNK(Status.st_mode))
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Type = file_type::symlink_file;
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perms Perms = static_cast<perms>(Status.st_mode);
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Result =
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file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_atime,
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Status.st_mtime, Status.st_uid, Status.st_gid,
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Status.st_size);
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return std::error_code();
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}
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std::error_code status(const Twine &Path, file_status &Result) {
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SmallString<128> PathStorage;
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StringRef P = Path.toNullTerminatedStringRef(PathStorage);
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struct stat Status;
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int StatRet = ::lstat(P.begin(), &Status);
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return fillStatus(StatRet, Status, Result);
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}
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std::error_code status(int FD, file_status &Result) {
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struct stat Status;
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int StatRet = ::fstat(FD, &Status);
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return fillStatus(StatRet, Status, Result);
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}
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std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
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StringRef path){
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SmallString<128> path_null(path);
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DIR *directory = ::opendir(path_null.c_str());
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if (!directory)
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return std::error_code(errno, std::generic_category());
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it.IterationHandle = reinterpret_cast<intptr_t>(directory);
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// Add something for replace_filename to replace.
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path::append(path_null, ".");
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it.CurrentEntry = directory_entry(path_null.str());
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return directory_iterator_increment(it);
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}
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std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
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if (it.IterationHandle)
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::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
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it.IterationHandle = 0;
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it.CurrentEntry = directory_entry();
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return std::error_code();
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}
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std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
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errno = 0;
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dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
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if (cur_dir == nullptr && errno != 0) {
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return std::error_code(errno, std::generic_category());
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} else if (cur_dir != nullptr) {
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StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
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if ((name.size() == 1 && name[0] == '.') ||
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(name.size() == 2 && name[0] == '.' && name[1] == '.'))
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return directory_iterator_increment(it);
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it.CurrentEntry.replace_filename(name);
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} else
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return directory_iterator_destruct(it);
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return std::error_code();
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}
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#if !defined(F_GETPATH)
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static bool hasProcSelfFD() {
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// If we have a /proc filesystem mounted, we can quickly establish the
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// real name of the file with readlink
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static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
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return Result;
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}
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#endif
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std::error_code openFileForRead(const Twine &Name, int &ResultFD,
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SmallVectorImpl<char> *RealPath) {
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SmallString<128> Storage;
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StringRef P = Name.toNullTerminatedStringRef(Storage);
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while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) {
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if (errno != EINTR)
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return std::error_code(errno, std::generic_category());
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}
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// Attempt to get the real name of the file, if the user asked
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if(!RealPath)
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return std::error_code();
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RealPath->clear();
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#if defined(F_GETPATH)
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// When F_GETPATH is availble, it is the quickest way to get
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// the real path name.
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char Buffer[MAXPATHLEN];
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if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
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RealPath->append(Buffer, Buffer + strlen(Buffer));
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#else
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char Buffer[PATH_MAX];
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if (hasProcSelfFD()) {
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char ProcPath[64];
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snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
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ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
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if (CharCount > 0)
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RealPath->append(Buffer, Buffer + CharCount);
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} else {
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// Use ::realpath to get the real path name
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if (::realpath(P.begin(), Buffer) != nullptr)
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RealPath->append(Buffer, Buffer + strlen(Buffer));
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}
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#endif
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return std::error_code();
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}
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std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
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OpenFlags Flags, unsigned Mode) {
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// Verify that we don't have both "append" and "excl".
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assert((!(Flags & F_Excl) || !(Flags & F_Append)) &&
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"Cannot specify both 'excl' and 'append' file creation flags!");
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int OpenFlags = O_CREAT;
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if (Flags & F_RW)
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OpenFlags |= O_RDWR;
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else
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OpenFlags |= O_WRONLY;
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if (Flags & F_Append)
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OpenFlags |= O_APPEND;
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else
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OpenFlags |= O_TRUNC;
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if (Flags & F_Excl)
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OpenFlags |= O_EXCL;
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SmallString<128> Storage;
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StringRef P = Name.toNullTerminatedStringRef(Storage);
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while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
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if (errno != EINTR)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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} // end namespace fs
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namespace path {
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bool home_directory(SmallVectorImpl<char> &result) {
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if (char *RequestedDir = std::getenv("HOME")) {
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result.clear();
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result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
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return true;
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}
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return false;
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}
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static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
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#if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
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// On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
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// macros defined in <unistd.h> on darwin >= 9
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int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
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: _CS_DARWIN_USER_CACHE_DIR;
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size_t ConfLen = confstr(ConfName, nullptr, 0);
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if (ConfLen > 0) {
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do {
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Result.resize(ConfLen);
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ConfLen = confstr(ConfName, Result.data(), Result.size());
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} while (ConfLen > 0 && ConfLen != Result.size());
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if (ConfLen > 0) {
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assert(Result.back() == 0);
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Result.pop_back();
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return true;
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}
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Result.clear();
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}
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#endif
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return false;
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}
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static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
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// First try using XDG_CACHE_HOME env variable,
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// as specified in XDG Base Directory Specification at
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// http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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if (const char *XdgCacheDir = std::getenv("XDG_CACHE_HOME")) {
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Result.clear();
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Result.append(XdgCacheDir, XdgCacheDir + strlen(XdgCacheDir));
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return true;
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}
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// Try Darwin configuration query
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if (getDarwinConfDir(false, Result))
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return true;
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// Use "$HOME/.cache" if $HOME is available
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if (home_directory(Result)) {
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append(Result, ".cache");
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return true;
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}
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return false;
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}
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static const char *getEnvTempDir() {
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// Check whether the temporary directory is specified by an environment
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// variable.
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const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
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for (const char *Env : EnvironmentVariables) {
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if (const char *Dir = std::getenv(Env))
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return Dir;
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}
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return nullptr;
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}
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static const char *getDefaultTempDir(bool ErasedOnReboot) {
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#ifdef P_tmpdir
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if ((bool)P_tmpdir)
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return P_tmpdir;
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#endif
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if (ErasedOnReboot)
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return "/tmp";
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return "/var/tmp";
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}
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void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
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Result.clear();
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if (ErasedOnReboot) {
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// There is no env variable for the cache directory.
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if (const char *RequestedDir = getEnvTempDir()) {
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Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
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return;
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}
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}
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if (getDarwinConfDir(ErasedOnReboot, Result))
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return;
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const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
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Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
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}
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} // end namespace path
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} // end namespace sys
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} // end namespace llvm
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