dgrove@google.com
4c0f559d23
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15 260f80e4-7a28-3924-810f-c04153c831b5
129 lines
2.6 KiB
C++
129 lines
2.6 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <libgen.h>
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#include "bin/file.h"
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class FileHandle {
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public:
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explicit FileHandle(int fd) : fd_(fd) { }
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~FileHandle() { }
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int fd() const { return fd_; }
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void set_fd(int fd) { fd_ = fd; }
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private:
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int fd_;
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// DISALLOW_COPY_AND_ASSIGN(FileHandle).
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FileHandle(const FileHandle&);
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void operator=(const FileHandle&);
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};
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File::~File() {
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// Close the file (unless it's a standard stream).
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if (handle_->fd() > STDERR_FILENO) {
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Close();
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}
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delete handle_;
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}
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void File::Close() {
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assert(handle_->fd() >= 0);
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int err = close(handle_->fd());
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if (err != 0) {
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const int kBufferSize = 1024;
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char error_message[kBufferSize];
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strerror_r(errno, error_message, kBufferSize);
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fprintf(stderr, "%s\n", error_message);
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}
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handle_->set_fd(kClosedFd);
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}
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bool File::IsClosed() {
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return handle_->fd() == kClosedFd;
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}
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int64_t File::Read(void* buffer, int64_t num_bytes) {
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assert(handle_->fd() >= 0);
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return read(handle_->fd(), buffer, num_bytes);
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}
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int64_t File::Write(const void* buffer, int64_t num_bytes) {
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assert(handle_->fd() >= 0);
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return write(handle_->fd(), buffer, num_bytes);
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}
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off_t File::Position() {
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assert(handle_->fd() >= 0);
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return lseek(handle_->fd(), 0, SEEK_CUR);
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}
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void File::Flush() {
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assert(handle_->fd() >= 0);
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fsync(handle_->fd());
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}
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off_t File::Length() {
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assert(handle_->fd() >= 0);
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off_t position = lseek(handle_->fd(), 0, SEEK_CUR);
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if (position < 0) {
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// The file is not capable of seeking. Return an error.
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return -1;
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}
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off_t result = lseek(handle_->fd(), 0, SEEK_END);
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lseek(handle_->fd(), position, SEEK_SET);
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return result;
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}
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File* File::OpenFile(const char* name, bool writable) {
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int flags = O_RDONLY;
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if (writable) {
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flags = (O_RDWR | O_CREAT | O_TRUNC);
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}
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int fd = open(name, flags, 0666);
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if (fd < 0) {
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return NULL;
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}
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return new File(name, new FileHandle(fd));
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}
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bool File::FileExists(const char* name) {
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struct stat st;
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if (stat(name, &st) == 0) {
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return S_ISREG(st.st_mode); // Deal with symlinks?
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} else {
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return false;
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}
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}
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bool File::IsAbsolutePath(const char* pathname) {
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return (pathname != NULL && pathname[0] == '/');
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}
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const char* File::PathSeparator() {
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return "/";
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}
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const char* File::StringEscapedPathSeparator() {
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return "/";
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}
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