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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#include "file_path.h"
#include "thread.h"
using namespace zen;
std::optional<PathComponents> zen::parsePathComponents(const Zstring& itemPath)
{
auto doParse = [&](int sepCountVolumeRoot, bool rootWithSep) -> std::optional<PathComponents>
{
assert(sepCountVolumeRoot > 0);
const Zstring itemPathPf = appendSeparator(itemPath); //simplify analysis of root without separator, e.g. \\server-name\share
for (auto it = itemPathPf.begin(); it != itemPathPf.end(); ++it)
if (*it == FILE_NAME_SEPARATOR)
if (--sepCountVolumeRoot == 0)
{
Zstring rootPath(itemPathPf.begin(), rootWithSep ? it + 1 : it);
Zstring relPath(it + 1, itemPathPf.end());
trim(relPath, TrimSide::both, [](Zchar c) { return c == FILE_NAME_SEPARATOR; });
return PathComponents{std::move(rootPath), std::move(relPath)};
}
return {};
};
std::optional<PathComponents> pc; //"/media/zenju/" and "/Volumes/" should not fail to parse
if (!pc && startsWith(itemPath, "/mnt/")) //e.g. /mnt/DEVICE_NAME
pc = doParse(3 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
if (!pc && startsWith(itemPath, "/media/")) //Ubuntu: e.g. /media/zenju/DEVICE_NAME
if (const std::optional<Zstring> username = getEnvironmentVar("USER"))
if (startsWith(itemPath, std::string("/media/") + *username + "/"))
pc = doParse(4 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
if (!pc && startsWith(itemPath, "/run/media/")) //CentOS, Suse: e.g. /run/media/zenju/DEVICE_NAME
if (const std::optional<Zstring> username = getEnvironmentVar("USER"))
if (startsWith(itemPath, std::string("/run/media/") + *username + "/"))
pc = doParse(5 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
if (!pc && startsWith(itemPath, "/run/user/")) //Ubuntu, e.g.: /run/user/1000/gvfs/smb-share:server=192.168.62.145,share=folder
{
Zstring tmp(itemPath.begin() + strLength("/run/user/"), itemPath.end());
tmp = beforeFirst(tmp, "/gvfs/", IfNotFoundReturn::none);
if (!tmp.empty() && std::all_of(tmp.begin(), tmp.end(), [](char c) { return isDigit(c); }))
/**/pc = doParse(6 /*sepCountVolumeRoot*/, false /*rootWithSep*/);
}
if (!pc && startsWith(itemPath, "/"))
pc = doParse(1 /*sepCountVolumeRoot*/, true /*rootWithSep*/);
return pc;
}
std::optional<Zstring> zen::getParentFolderPath(const Zstring& itemPath)
{
if (const std::optional<PathComponents> pc = parsePathComponents(itemPath))
{
if (pc->relPath.empty())
return std::nullopt;
return appendPath(pc->rootPath, beforeLast(pc->relPath, FILE_NAME_SEPARATOR, IfNotFoundReturn::none));
}
assert(itemPath.empty());
return std::nullopt;
}
Zstring zen::getFileExtension(const ZstringView filePath)
{
const ZstringView fileName = afterLast(filePath, FILE_NAME_SEPARATOR, IfNotFoundReturn::all);
return Zstring(afterLast(fileName, Zstr('.'), IfNotFoundReturn::none));
}
Zstring zen::appendSeparator(Zstring path) //support rvalue references!
{
assert(!endsWith(path, FILE_NAME_SEPARATOR == Zstr('/') ? Zstr('\\' ) : Zstr('/' )));
if (!endsWith(path, FILE_NAME_SEPARATOR))
path += FILE_NAME_SEPARATOR;
return path; //returning a by-value parameter => RVO if possible, r-value otherwise!
}
bool zen::isValidRelPath(const Zstring& relPath)
{
//relPath is expected to use FILE_NAME_SEPARATOR!
if constexpr (FILE_NAME_SEPARATOR != Zstr('/' )) if (contains(relPath, Zstr('/' ))) return false;
if constexpr (FILE_NAME_SEPARATOR != Zstr('\\')) if (contains(relPath, Zstr('\\'))) return false;
const Zchar doubleSep[] = {FILE_NAME_SEPARATOR, FILE_NAME_SEPARATOR, 0};
return !startsWith(relPath, FILE_NAME_SEPARATOR) && !endsWith(relPath, FILE_NAME_SEPARATOR) &&
!contains(relPath, doubleSep);
}
Zstring zen::appendPath(const Zstring& basePath, const Zstring& relPath)
{
assert(isValidRelPath(relPath));
if (relPath.empty())
return basePath; //with or without path separator, e.g. C:\ or C:\folder
//assert(!basePath.empty());
if (basePath.empty()) //basePath might be a relative path, too!
return relPath;
if (endsWith(basePath, FILE_NAME_SEPARATOR))
return basePath + relPath;
Zstring output = basePath;
output.reserve(basePath.size() + 1 + relPath.size()); //append all three strings using a single memory allocation
return std::move(output) + FILE_NAME_SEPARATOR + relPath; //
}
/* https://docs.microsoft.com/de-de/windows/desktop/Intl/handling-sorting-in-your-applications
Perf test: compare strings 10 mio times; 64 bit build
-----------------------------------------------------
string a = "Fjk84$%kgfj$%T\\\\Gffg\\gsdgf\\fgsx----------d-"
string b = "fjK84$%kgfj$%T\\\\gfFg\\gsdgf\\fgSy----------dfdf"
Windows (UTF16 wchar_t)
4 ns | wcscmp
67 ns | CompareStringOrdinalFunc+ + bIgnoreCase
314 ns | LCMapString + wmemcmp
OS X (UTF8 char)
6 ns | strcmp
98 ns | strcasecmp
120 ns | strncasecmp + std::min(sizeLhs, sizeRhs);
856 ns | CFStringCreateWithCString + CFStringCompare(kCFCompareCaseInsensitive)
1110 ns | CFStringCreateWithCStringNoCopy + CFStringCompare(kCFCompareCaseInsensitive)
________________________
time per call | function */
std::weak_ordering zen::compareNativePath(const Zstring& lhs, const Zstring& rhs)
{
assert(!contains(lhs, Zchar('\0'))); //don't expect embedded nulls!
assert(!contains(rhs, Zchar('\0'))); //
return lhs <=> rhs;
}
namespace
{
std::unordered_map<Zstring, Zstring> getAllEnvVars()
{
assert(runningOnMainThread());
std::unordered_map<Zstring, Zstring> envVars;
if (char** line = environ)
for (; *line; ++line)
{
const std::string_view l(*line);
envVars.emplace(beforeFirst(l, '=', IfNotFoundReturn::all),
afterFirst(l, '=', IfNotFoundReturn::none));
}
return envVars;
}
constinit Global<std::unordered_map<Zstring, Zstring>> globalEnvVars;
GLOBAL_RUN_ONCE(
//*INDENT-OFF*
//mitigate static initialization order fiasco: (whatever comes first)
if (!globalEnvVars.get())
globalEnvVars.set(std::make_unique<std::unordered_map<Zstring, Zstring>>(getAllEnvVars()))
//*INDENT-ON*
);
}
std::optional<Zstring> zen::getEnvironmentVar(const ZstringView name)
{
/* const char* buffer = ::getenv(name); => NO! *not* thread-safe: returns pointer to internal memory!
might change after setenv(), allegedly possible even after another getenv()!
getenv_s() to the rescue!? not implemented on GCC, apparently *still* not threadsafe!!!
=> *eff* this: make a global copy during start up! */
std::shared_ptr<std::unordered_map<Zstring, Zstring>> envVars = globalEnvVars.get();
if (!envVars) //access during static init or shutdown?
{
if (globalEnvVars.wasDestroyed())
{
assert(false);
return {}; //SOL!
}
//mitigate static initialization order fiasco: (whatever comes first)
globalEnvVars.set(std::make_unique<std::unordered_map<Zstring, Zstring>>(getAllEnvVars()));
envVars = globalEnvVars.get();
}
const auto it = envVars->find(name);
if (it == envVars->end())
return {};
return it->second;
}
|
