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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "disk_interface.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#ifdef WIN32
#include <windows.h>
#endif
#include "util.h"
namespace {
std::string DirName(const std::string& path) {
#ifdef WIN32
const char kPathSeparator = '\\';
#else
const char kPathSeparator = '/';
#endif
std::string::size_type slash_pos = path.rfind(kPathSeparator);
if (slash_pos == std::string::npos)
return std::string(); // Nothing to do.
while (slash_pos > 0 && path[slash_pos - 1] == kPathSeparator)
--slash_pos;
return path.substr(0, slash_pos);
}
} // namespace
// DiskInterface ---------------------------------------------------------------
bool DiskInterface::MakeDirs(const std::string& path) {
std::string dir = DirName(path);
if (dir.empty())
return true; // Reached root; assume it's there.
int mtime = Stat(dir);
if (mtime < 0)
return false; // Error.
if (mtime > 0)
return true; // Exists already; we're done.
// Directory doesn't exist. Try creating its parent first.
bool success = MakeDirs(dir);
if (!success)
return false;
return MakeDir(dir);
}
// RealDiskInterface -----------------------------------------------------------
int RealDiskInterface::Stat(const std::string& path) {
#ifdef WIN32
WIN32_FILE_ATTRIBUTE_DATA attrs;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &attrs)) {
DWORD err = GetLastError();
if (err == ERROR_FILE_NOT_FOUND || err == ERROR_PATH_NOT_FOUND)
return 0;
Error("GetFileAttributesEx(%s): %s", path.c_str(),
GetLastErrorString().c_str());
return -1;
}
const FILETIME& filetime = attrs.ftLastWriteTime;
// FILETIME is in 100-nanosecond increments since the Windows epoch.
// We don't much care about epoch correctness but we do want the
// resulting value to fit in an integer.
uint64_t mtime = ((uint64_t)filetime.dwHighDateTime << 32) |
((uint64_t)filetime.dwLowDateTime);
mtime /= 1000000000LL / 100; // 100ns -> s.
mtime -= 12622770400LL; // 1600 epoch -> 2000 epoch (subtract 400 years).
return (int)mtime;
#else
struct stat st;
if (stat(path.c_str(), &st) < 0) {
if (errno == ENOENT)
return 0;
Error("stat(%s): %s", path.c_str(), strerror(errno));
return -1;
}
return st.st_mtime;
#endif
}
bool RealDiskInterface::MakeDir(const std::string& path) {
if (::MakeDir(path) < 0) {
Error("mkdir(%s): %s", path.c_str(), strerror(errno));
return false;
}
return true;
}
std::string RealDiskInterface::ReadFile(const std::string& path,
std::string* err) {
std::string contents;
int ret = ::ReadFile(path, &contents, err);
if (ret == -ENOENT) {
// Swallow ENOENT.
err->clear();
}
return contents;
}
int RealDiskInterface::RemoveFile(const std::string& path) {
if (remove(path.c_str()) < 0) {
switch (errno) {
case ENOENT:
return 1;
default:
Error("remove(%s): %s", path.c_str(), strerror(errno));
return -1;
}
} else {
return 0;
}
}
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