1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
// 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.
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 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 (TimeStamp)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;
}
}
|
