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path: update win32 toNamespacedPath to support device namespace paths
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‎lib/path.js

Lines changed: 36 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -180,6 +180,29 @@ function glob(path, pattern, windows) {
180180
});
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}
182182

183+
// Regular expressions to identify special device names in Windows.
184+
// COM to AUX (e.g., COM1, LPT1, NUL, CON, CONIN$, PRN, AUX) are reserved OS device names.
185+
// therefore, Paths like C:\path\to\COM1 map to \\.\COM1, referencing hardware or system streams.
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// Ref: https://learn.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation
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//
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// PhysicalDrive to Changer (e.g., PhysicalDrive1, TAPE0, Changer0) are not reserved OS device names.
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// Ref: https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea
190+
const windowsDevicePatterns = [
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/([\\/])?(COM\d+)$/i,
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/([\\/])?(LPT\d+)$/i,
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/([\\/])?(NUL)$/i,
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/([\\/])?(CON)$/i,
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/([\\/])?(PRN)$/i,
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/([\\/])?(AUX)$/i,
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/([\\/])?(CONIN\$)$/i,
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/([\\/])?(CONOUT\$)$/i,
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/^(PHYSICALDRIVE\d+)$/i,
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/^(PIPE\\.+)$/i,
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/^(MAILSLOT\\.+)$/i,
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/^(TAPE\d+)$/i,
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/^(CHANGER\d+)$/i,
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];
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183206
const win32 = {
184207
/**
185208
* path.resolve([from ...], to)
@@ -687,6 +710,19 @@ const win32 = {
687710
if (typeof path !== 'string' || path.length === 0)
688711
return path;
689712

713+
// Check if the path matches any device pattern
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if (windowsDevicePatterns.some((pattern) => pattern.test(path))) {
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let deviceName;
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if (/^(PIPE\\.+)$/i.test(path) || /^(MAILSLOT\\.+)$/i.test(path)) {
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// If the path starts with PIPE\ or MAILSLOT\, keep it as is
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deviceName = path;
719+
} else {
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// Extract the last component after the last slash or backslash
721+
deviceName = path.split(/[\\/]/).pop();
722+
}
723+
return `\\\\.\\${deviceName}`;
724+
}
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690726
const resolvedPath = win32.resolve(path);
691727

692728
if (resolvedPath.length <= 2)

‎src/path.cc

Lines changed: 37 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -269,6 +269,43 @@ std::string PathResolve(Environment* env,
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void ToNamespacedPath(Environment* env, BufferValue* path) {
270270
#ifdef _WIN32
271271
if (path->length() == 0) return;
272+
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static const std::vector<std::regex> windowsDevicePatterns = {
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std::regex(R"((.*[\\/])?COM\d+$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?LPT\d+$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?NUL$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?CON$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?PRN$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?AUX$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?CONIN\$$)", std::regex_constants::icase),
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std::regex(R"((.*[\\/])?CONOUT\$$)", std::regex_constants::icase),
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std::regex(R"(^PHYSICALDRIVE\d+$)", std::regex_constants::icase),
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std::regex(R"(^(PIPE\\.+)$)", std::regex_constants::icase),
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std::regex(R"(^(MAILSLOT\\.+)$)", std::regex_constants::icase),
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std::regex(R"(^TAPE\d+$)", std::regex_constants::icase),
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std::regex(R"(^CHANGER\d+$)", std::regex_constants::icase)};
287+
288+
std::string path_str(path->ToStringView());
289+
for (const std::regex& pattern : windowsDevicePatterns) {
290+
if (std::regex_match(path_str, pattern)) {
291+
std::string deviceName;
292+
if (std::regex_match(path_str,
293+
std::regex(R"(^(PIPE\\.+|MAILSLOT\\.+)$)",
294+
std::regex_constants::icase))) {
295+
deviceName = path_str;
296+
} else {
297+
size_t pos = path_str.find_last_of("\\/");
298+
deviceName =
299+
(pos != std::string::npos) ? path_str.substr(pos + 1) : path_str;
300+
}
301+
std::string new_path = "\\\\.\\" + deviceName;
302+
path->AllocateSufficientStorage(new_path.size() + 1);
303+
path->SetLength(new_path.size());
304+
memcpy(path->out(), new_path.c_str(), new_path.size() + 1);
305+
return;
306+
}
307+
}
308+
272309
std::string resolved_path = node::PathResolve(env, {path->ToStringView()});
273310
if (resolved_path.size() <= 2) {
274311
return;

‎test/cctest/test_path.cc

Lines changed: 59 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -81,6 +81,65 @@ TEST_F(PathTest, ToNamespacedPath) {
8181
.ToLocalChecked());
8282
ToNamespacedPath(*env, &data_4);
8383
EXPECT_EQ(data_4.ToStringView(), "\\\\?\\c:\\Windows\\System");
84+
BufferValue data5(
85+
isolate_,
86+
v8::String::NewFromUtf8(isolate_, "C:\\path\\COM1").ToLocalChecked());
87+
ToNamespacedPath(*env, &data5);
88+
EXPECT_EQ(data5.ToStringView(), "\\\\.\\COM1");
89+
BufferValue data6(isolate_,
90+
v8::String::NewFromUtf8(isolate_, "COM1").ToLocalChecked());
91+
ToNamespacedPath(*env, &data6);
92+
EXPECT_EQ(data6.ToStringView(), "\\\\.\\COM1");
93+
BufferValue data7(isolate_,
94+
v8::String::NewFromUtf8(isolate_, "LPT1").ToLocalChecked());
95+
ToNamespacedPath(*env, &data7);
96+
EXPECT_EQ(data7.ToStringView(), "\\\\.\\LPT1");
97+
BufferValue data8(
98+
isolate_, v8::String::NewFromUtf8(isolate_, "C:\\LPT1").ToLocalChecked());
99+
ToNamespacedPath(*env, &data8);
100+
EXPECT_EQ(data8.ToStringView(), "\\\\.\\LPT1");
101+
BufferValue data9(
102+
isolate_,
103+
v8::String::NewFromUtf8(isolate_, "PhysicalDrive0").ToLocalChecked());
104+
ToNamespacedPath(*env, &data9);
105+
EXPECT_EQ(data9.ToStringView(), "\\\\.\\PhysicalDrive0");
106+
BufferValue data10(
107+
isolate_,
108+
v8::String::NewFromUtf8(isolate_, "pipe\\mypipe").ToLocalChecked());
109+
ToNamespacedPath(*env, &data10);
110+
EXPECT_EQ(data10.ToStringView(), "\\\\.\\pipe\\mypipe");
111+
BufferValue data11(
112+
isolate_,
113+
v8::String::NewFromUtf8(isolate_, "MAILSLOT\\mySlot").ToLocalChecked());
114+
ToNamespacedPath(*env, &data11);
115+
EXPECT_EQ(data11.ToStringView(), "\\\\.\\MAILSLOT\\mySlot");
116+
BufferValue data12(isolate_,
117+
v8::String::NewFromUtf8(isolate_, "NUL").ToLocalChecked());
118+
ToNamespacedPath(*env, &data12);
119+
EXPECT_EQ(data12.ToStringView(), "\\\\.\\NUL");
120+
BufferValue data13(
121+
isolate_, v8::String::NewFromUtf8(isolate_, "Tape0").ToLocalChecked());
122+
ToNamespacedPath(*env, &data13);
123+
EXPECT_EQ(data13.ToStringView(), "\\\\.\\Tape0");
124+
BufferValue data14(
125+
isolate_, v8::String::NewFromUtf8(isolate_, "Changer0").ToLocalChecked());
126+
ToNamespacedPath(*env, &data14);
127+
EXPECT_EQ(data14.ToStringView(), "\\\\.\\Changer0");
128+
BufferValue data15(isolate_,
129+
v8::String::NewFromUtf8(isolate_, "\\\\.\\pipe\\somepipe")
130+
.ToLocalChecked());
131+
ToNamespacedPath(*env, &data15);
132+
EXPECT_EQ(data15.ToStringView(), "\\\\.\\pipe\\somepipe");
133+
BufferValue data16(
134+
isolate_,
135+
v8::String::NewFromUtf8(isolate_, "\\\\.\\COM1").ToLocalChecked());
136+
ToNamespacedPath(*env, &data16);
137+
EXPECT_EQ(data16.ToStringView(), "\\\\.\\COM1");
138+
BufferValue data17(
139+
isolate_,
140+
v8::String::NewFromUtf8(isolate_, "\\\\.\\LPT1").ToLocalChecked());
141+
ToNamespacedPath(*env, &data17);
142+
EXPECT_EQ(data17.ToStringView(), "\\\\.\\LPT1");
84143
#else
85144
BufferValue data(
86145
isolate_,

‎test/parallel/test-path-makelong.js

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -39,8 +39,34 @@ if (common.isWindows) {
3939
assert.strictEqual(path.toNamespacedPath(
4040
'\\\\?\\UNC\\someserver\\someshare\\somefile'),
4141
'\\\\?\\UNC\\someserver\\someshare\\somefile');
42+
// Device name tests
43+
assert.strictEqual(path.toNamespacedPath('C:\\path\\COM1'),
44+
'\\\\.\\COM1');
45+
assert.strictEqual(path.toNamespacedPath('COM1'),
46+
'\\\\.\\COM1');
47+
assert.strictEqual(path.toNamespacedPath('LPT1'),
48+
'\\\\.\\LPT1');
49+
assert.strictEqual(path.toNamespacedPath('C:\\LPT1'),
50+
'\\\\.\\LPT1');
51+
assert.strictEqual(path.toNamespacedPath('PhysicalDrive0'),
52+
'\\\\.\\PhysicalDrive0');
53+
assert.strictEqual(path.toNamespacedPath('pipe\\mypipe'),
54+
'\\\\.\\pipe\\mypipe');
55+
assert.strictEqual(path.toNamespacedPath('MAILSLOT\\mySlot'),
56+
'\\\\.\\MAILSLOT\\mySlot');
57+
assert.strictEqual(path.toNamespacedPath('NUL'),
58+
'\\\\.\\NUL');
59+
assert.strictEqual(path.toNamespacedPath('Tape0'),
60+
'\\\\.\\Tape0');
61+
assert.strictEqual(path.toNamespacedPath('Changer0'),
62+
'\\\\.\\Changer0');
63+
// Test cases for inputs with "\\.\" prefix
4264
assert.strictEqual(path.toNamespacedPath('\\\\.\\pipe\\somepipe'),
4365
'\\\\.\\pipe\\somepipe');
66+
assert.strictEqual(path.toNamespacedPath('\\\\.\\COM1'),
67+
'\\\\.\\COM1');
68+
assert.strictEqual(path.toNamespacedPath('\\\\.\\LPT1'),
69+
'\\\\.\\LPT1');
4470
}
4571

4672
assert.strictEqual(path.toNamespacedPath(''), '');

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