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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2023 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS) || os(Linux) || os(Android)
extension String {
@inlinable
init(
backportUnsafeUninitializedCapacity capacity: Int,
initializingUTF8With initializer: (_ buffer: UnsafeMutableBufferPointer<UInt8>) throws -> Int
) rethrows {
// The buffer will store zero terminated C string
let buffer = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: capacity + 1)
defer {
buffer.deallocate()
}
let initializedCount = try initializer(buffer)
precondition(initializedCount <= capacity, "Overran buffer in initializer!")
// add zero termination
buffer[initializedCount] = 0
self = String(cString: buffer.baseAddress!)
}
}
// Frustratingly, Swift 5.3 shipped before the macOS 11 SDK did, so we cannot gate the availability of
// this declaration on having the 5.3 compiler. This has caused a number of build issues. While updating
// to newer Xcodes does work, we can save ourselves some hassle and just wait until 5.4 to get this
// enhancement on Apple platforms.
extension String {
@inlinable
init(
customUnsafeUninitializedCapacity capacity: Int,
initializingUTF8With initializer: (
_ buffer: UnsafeMutableBufferPointer<UInt8>
) throws -> Int
) rethrows {
if #available(macOS 11.0, iOS 14.0, tvOS 14.0, watchOS 7.0, *) {
try self.init(
unsafeUninitializedCapacity: capacity,
initializingUTF8With: initializer
)
} else {
try self.init(
backportUnsafeUninitializedCapacity: capacity,
initializingUTF8With: initializer
)
}
}
}
#endif
|
