mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
Thanks to Pino Toscano for the patch git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154500 91177308-0d34-0410-b5e6-96231b3b80d8
517 lines
15 KiB
C++
517 lines
15 KiB
C++
//===- llvm/Support/Unix/PathV2.cpp - 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 PathV2 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 "Unix.h"
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# if HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# if HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# if HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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#if HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#if HAVE_LIMITS_H
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#include <limits.h>
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#endif
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// For GNU Hurd
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#if defined(__GNU__) && !defined(PATH_MAX)
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# define PATH_MAX 4096
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#endif
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using namespace llvm;
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namespace {
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/// This class automatically closes the given file descriptor when it goes out
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/// of scope. You can take back explicit ownership of the file descriptor by
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/// calling take(). The destructor does not verify that close was successful.
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/// Therefore, never allow this class to call close on a file descriptor that
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/// has been read from or written to.
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struct AutoFD {
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int FileDescriptor;
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AutoFD(int fd) : FileDescriptor(fd) {}
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~AutoFD() {
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if (FileDescriptor >= 0)
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::close(FileDescriptor);
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}
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int take() {
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int ret = FileDescriptor;
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FileDescriptor = -1;
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return ret;
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}
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operator int() const {return FileDescriptor;}
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};
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error_code TempDir(SmallVectorImpl<char> &result) {
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// FIXME: Don't use TMPDIR if program is SUID or SGID enabled.
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const char *dir = 0;
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(dir = std::getenv("TMPDIR" )) ||
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(dir = std::getenv("TMP" )) ||
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(dir = std::getenv("TEMP" )) ||
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(dir = std::getenv("TEMPDIR")) ||
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#ifdef P_tmpdir
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(dir = P_tmpdir) ||
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#endif
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(dir = "/tmp");
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result.clear();
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StringRef d(dir);
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result.append(d.begin(), d.end());
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return error_code::success();
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}
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}
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namespace llvm {
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namespace sys {
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namespace fs {
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error_code current_path(SmallVectorImpl<char> &result) {
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#ifdef MAXPATHLEN
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result.reserve(MAXPATHLEN);
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#else
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// For GNU Hurd
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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()) == 0) {
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// See if there was a real error.
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if (errno != errc::not_enough_memory)
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return error_code(errno, system_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 error_code::success();
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}
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error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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const size_t buf_sz = 32768;
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char buffer[buf_sz];
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int from_file = -1, to_file = -1;
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// Open from.
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if ((from_file = ::open(f.begin(), O_RDONLY)) < 0)
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return error_code(errno, system_category());
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AutoFD from_fd(from_file);
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// Stat from.
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struct stat from_stat;
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if (::stat(f.begin(), &from_stat) != 0)
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return error_code(errno, system_category());
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// Setup to flags.
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int to_flags = O_CREAT | O_WRONLY;
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if (copt == copy_option::fail_if_exists)
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to_flags |= O_EXCL;
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// Open to.
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if ((to_file = ::open(t.begin(), to_flags, from_stat.st_mode)) < 0)
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return error_code(errno, system_category());
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AutoFD to_fd(to_file);
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// Copy!
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ssize_t sz, sz_read = 1, sz_write;
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while (sz_read > 0 &&
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(sz_read = ::read(from_fd, buffer, buf_sz)) > 0) {
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// Allow for partial writes - see Advanced Unix Programming (2nd Ed.),
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// Marc Rochkind, Addison-Wesley, 2004, page 94
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sz_write = 0;
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do {
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if ((sz = ::write(to_fd, buffer + sz_write, sz_read - sz_write)) < 0) {
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sz_read = sz; // cause read loop termination.
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break; // error.
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}
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sz_write += sz;
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} while (sz_write < sz_read);
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}
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// After all the file operations above the return value of close actually
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// matters.
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if (::close(from_fd.take()) < 0) sz_read = -1;
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if (::close(to_fd.take()) < 0) sz_read = -1;
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// Check for errors.
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if (sz_read < 0)
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return error_code(errno, system_category());
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return error_code::success();
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}
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error_code create_directory(const Twine &path, bool &existed) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
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if (errno != errc::file_exists)
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return error_code(errno, system_category());
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existed = true;
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} else
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existed = false;
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return error_code::success();
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}
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error_code create_hard_link(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::link(t.begin(), f.begin()) == -1)
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return error_code(errno, system_category());
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return error_code::success();
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}
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error_code create_symlink(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::symlink(t.begin(), f.begin()) == -1)
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return error_code(errno, system_category());
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return error_code::success();
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}
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error_code remove(const Twine &path, bool &existed) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::remove(p.begin()) == -1) {
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if (errno != errc::no_such_file_or_directory)
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return error_code(errno, system_category());
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existed = false;
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} else
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existed = true;
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return error_code::success();
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}
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error_code rename(const Twine &from, const Twine &to) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::rename(f.begin(), t.begin()) == -1) {
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// If it's a cross device link, copy then delete, otherwise return the error
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if (errno == EXDEV) {
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if (error_code ec = copy_file(from, to, copy_option::overwrite_if_exists))
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return ec;
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bool Existed;
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if (error_code ec = remove(from, Existed))
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return ec;
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} else
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return error_code(errno, system_category());
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}
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return error_code::success();
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}
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error_code resize_file(const Twine &path, uint64_t size) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::truncate(p.begin(), size) == -1)
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return error_code(errno, system_category());
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return error_code::success();
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}
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error_code exists(const Twine &path, bool &result) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat status;
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if (::stat(p.begin(), &status) == -1) {
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if (errno != errc::no_such_file_or_directory)
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return error_code(errno, system_category());
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result = false;
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} else
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result = true;
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return error_code::success();
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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.st_dev == B.st_dev &&
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A.st_ino == B.st_ino;
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}
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error_code equivalent(const Twine &A, const Twine &B, bool &result) {
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file_status fsA, fsB;
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if (error_code ec = status(A, fsA)) return ec;
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if (error_code ec = status(B, fsB)) return ec;
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result = equivalent(fsA, fsB);
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return error_code::success();
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}
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error_code file_size(const Twine &path, uint64_t &result) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat status;
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if (::stat(p.begin(), &status) == -1)
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return error_code(errno, system_category());
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if (!S_ISREG(status.st_mode))
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return make_error_code(errc::operation_not_permitted);
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result = status.st_size;
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return error_code::success();
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}
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error_code status(const Twine &path, file_status &result) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat status;
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if (::stat(p.begin(), &status) != 0) {
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error_code ec(errno, system_category());
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if (ec == 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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if (S_ISDIR(status.st_mode))
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result = file_status(file_type::directory_file);
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else if (S_ISREG(status.st_mode))
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result = file_status(file_type::regular_file);
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else if (S_ISBLK(status.st_mode))
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result = file_status(file_type::block_file);
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else if (S_ISCHR(status.st_mode))
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result = file_status(file_type::character_file);
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else if (S_ISFIFO(status.st_mode))
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result = file_status(file_type::fifo_file);
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else if (S_ISSOCK(status.st_mode))
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result = file_status(file_type::socket_file);
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else
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result = file_status(file_type::type_unknown);
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result.st_dev = status.st_dev;
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result.st_ino = status.st_ino;
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return error_code::success();
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}
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error_code unique_file(const Twine &model, int &result_fd,
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SmallVectorImpl<char> &result_path,
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bool makeAbsolute) {
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SmallString<128> Model;
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model.toVector(Model);
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// Null terminate.
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Model.c_str();
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if (makeAbsolute) {
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// Make model absolute by prepending a temp directory if it's not already.
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bool absolute = path::is_absolute(Twine(Model));
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if (!absolute) {
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SmallString<128> TDir;
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if (error_code ec = TempDir(TDir)) return ec;
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path::append(TDir, Twine(Model));
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Model.swap(TDir);
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}
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}
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// Replace '%' with random chars. From here on, DO NOT modify model. It may be
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// needed if the randomly chosen path already exists.
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SmallString<128> RandomPath;
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RandomPath.reserve(Model.size() + 1);
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::srand(::time(NULL));
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retry_random_path:
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// This is opened here instead of above to make it easier to track when to
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// close it. Collisions should be rare enough for the possible extra syscalls
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// not to matter.
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FILE *RandomSource = ::fopen("/dev/urandom", "r");
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RandomPath.set_size(0);
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for (SmallVectorImpl<char>::const_iterator i = Model.begin(),
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e = Model.end(); i != e; ++i) {
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if (*i == '%') {
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char val = 0;
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if (RandomSource)
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val = fgetc(RandomSource);
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else
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val = ::rand();
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RandomPath.push_back("0123456789abcdef"[val & 15]);
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} else
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RandomPath.push_back(*i);
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}
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if (RandomSource)
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::fclose(RandomSource);
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// Try to open + create the file.
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rety_open_create:
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int RandomFD = ::open(RandomPath.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (RandomFD == -1) {
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// If the file existed, try again, otherwise, error.
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if (errno == errc::file_exists)
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goto retry_random_path;
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// The path prefix doesn't exist.
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if (errno == errc::no_such_file_or_directory) {
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StringRef p(RandomPath.begin(), RandomPath.size());
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SmallString<64> dir_to_create;
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for (path::const_iterator i = path::begin(p),
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e = --path::end(p); i != e; ++i) {
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path::append(dir_to_create, *i);
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bool Exists;
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if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
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if (!Exists) {
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// Don't try to create network paths.
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if (i->size() > 2 && (*i)[0] == '/' &&
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(*i)[1] == '/' &&
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(*i)[2] != '/')
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return make_error_code(errc::no_such_file_or_directory);
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if (::mkdir(dir_to_create.c_str(), 0700) == -1)
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return error_code(errno, system_category());
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}
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}
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goto rety_open_create;
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}
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return error_code(errno, system_category());
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}
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// Make the path absolute.
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char real_path_buff[PATH_MAX + 1];
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if (realpath(RandomPath.c_str(), real_path_buff) == NULL) {
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int error = errno;
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::close(RandomFD);
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::unlink(RandomPath.c_str());
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return error_code(error, system_category());
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}
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result_path.clear();
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StringRef d(real_path_buff);
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result_path.append(d.begin(), d.end());
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result_fd = RandomFD;
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return error_code::success();
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}
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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 == 0)
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return error_code(errno, system_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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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 error_code::success();
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}
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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 == 0 && errno != 0) {
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return error_code(errno, system_category());
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} else if (cur_dir != 0) {
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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 error_code::success();
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}
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error_code get_magic(const Twine &path, uint32_t len,
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SmallVectorImpl<char> &result) {
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SmallString<128> PathStorage;
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StringRef Path = path.toNullTerminatedStringRef(PathStorage);
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result.set_size(0);
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// Open path.
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std::FILE *file = std::fopen(Path.data(), "rb");
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if (file == 0)
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return error_code(errno, system_category());
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// Reserve storage.
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result.reserve(len);
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// Read magic!
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size_t size = std::fread(result.data(), 1, len, file);
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if (std::ferror(file) != 0) {
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std::fclose(file);
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return error_code(errno, system_category());
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} else if (size != result.size()) {
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|
if (std::feof(file) != 0) {
|
|
std::fclose(file);
|
|
result.set_size(size);
|
|
return make_error_code(errc::value_too_large);
|
|
}
|
|
}
|
|
std::fclose(file);
|
|
result.set_size(len);
|
|
return error_code::success();
|
|
}
|
|
|
|
} // end namespace fs
|
|
} // end namespace sys
|
|
} // end namespace llvm
|