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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>
#include <sys/types.h>
#ifdef _WIN32
#include <windows.h>
#include <direct.h> // _mkdir
#endif
#include "util.h"
namespace {
string DirName(const string& path) {
#ifdef _WIN32
const char kPathSeparator = '\\';
#else
const char kPathSeparator = '/';
#endif
string::size_type slash_pos = path.rfind(kPathSeparator);
if (slash_pos == string::npos)
return string(); // Nothing to do.
while (slash_pos > 0 && path[slash_pos - 1] == kPathSeparator)
--slash_pos;
return path.substr(0, slash_pos);
}
int MakeDir(const string& path) {
#ifdef _WIN32
return _mkdir(path.c_str());
#else
return mkdir(path.c_str(), 0777);
#endif
}
} // namespace
// DiskInterface ---------------------------------------------------------------
bool DiskInterface::MakeDirs(const string& path) {
string dir = DirName(path);
if (dir.empty())
return true; // Reached root; assume it's there.
TimeStamp 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 -----------------------------------------------------------
TimeStamp RealDiskInterface::Stat(const string& path) {
#ifdef _WIN32
// MSDN: "Naming Files, Paths, and Namespaces"
// http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
if (!path.empty() && path[0] != '\\' && path.size() > MAX_PATH) {
Error("Stat(%s): Filename longer than %i characters",
path.c_str(), MAX_PATH);
return -1;
}
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 (TimeStamp)mtime;
#else
struct stat st;
if (stat(path.c_str(), &st) < 0) {
if (errno == ENOENT || errno == ENOTDIR)
return 0;
Error("stat(%s): %s", path.c_str(), strerror(errno));
return -1;
}
return st.st_mtime;
#endif
}
bool RealDiskInterface::WriteFile(const string& path, const string& contents) {
FILE * fp = fopen(path.c_str(), "w");
if (fp == NULL) {
Error("WriteFile(%s): Unable to create file. %s",
path.c_str(), strerror(errno));
return false;
}
if (fwrite(contents.data(), 1, contents.length(), fp) < contents.length()) {
Error("WriteFile(%s): Unable to write to the file. %s",
path.c_str(), strerror(errno));
fclose(fp);
return false;
}
if (fclose(fp) == EOF) {
Error("WriteFile(%s): Unable to close the file. %s",
path.c_str(), strerror(errno));
return false;
}
return true;
}
bool RealDiskInterface::MakeDir(const string& path) {
if (::MakeDir(path) < 0) {
Error("mkdir(%s): %s", path.c_str(), strerror(errno));
return false;
}
return true;
}
string RealDiskInterface::ReadFile(const string& path, string* err) {
string contents;
int ret = ::ReadFile(path, &contents, err);
if (ret == -ENOENT) {
// Swallow ENOENT.
err->clear();
}
return contents;
}
int RealDiskInterface::RemoveFile(const 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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