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94 lines
3.2 KiB
Swift
94 lines
3.2 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// String interop with C
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//===----------------------------------------------------------------------===//
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import SwiftShims
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extension String {
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/// Create a new `String` by copying the nul-terminated UTF-8 data
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/// referenced by a `cString`.
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///
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/// If `cString` contains ill-formed UTF-8 code unit sequences, replaces them
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/// with replacement characters (U+FFFD).
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///
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/// - Requires: `cString != nil`
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public init(cString: UnsafePointer<CChar>) {
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_precondition(cString != nil, "cString must not be nil")
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self = String.decodeCString(UnsafePointer(cString), as: UTF8.self,
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repairingInvalidCodeUnits: true)!.result
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}
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/// Create a new `String` by copying the nul-terminated UTF-8 data
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/// referenced by a `cString`.
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///
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/// Does not try to repair ill-formed UTF-8 code unit sequences, fails if any
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/// such sequences are found.
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///
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/// - Requires: `cString != nil`
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public init?(validatingUTF8 cString: UnsafePointer<CChar>) {
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_precondition(cString != nil, "cString must not be nil")
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guard let (result, _) = String.decodeCString(
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UnsafePointer(cString),
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as: UTF8.self,
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repairingInvalidCodeUnits: false) else {
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return nil
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}
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self = result
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}
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/// Create a new `String` by copying the nul-terminated data
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/// referenced by a `cString` using `encoding`.
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///
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/// Returns `nil` if the `cString` is `NULL` or if it contains ill-formed code
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/// units and no repairing has been requested. Otherwise replaces
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/// ill-formed code units with replacement characters (U+FFFD).
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@warn_unused_result
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public static func decodeCString<Encoding : UnicodeCodec>(
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cString: UnsafePointer<Encoding.CodeUnit>,
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as encoding: Encoding.Type,
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repairingInvalidCodeUnits isReparing: Bool = true)
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-> (result: String, repairsMade: Bool)? {
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if cString._isNull {
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return nil
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}
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let len = Int(_swift_stdlib_strlen(UnsafePointer(cString)))
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let buffer = UnsafeBufferPointer<Encoding.CodeUnit>(
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start: cString, count: len)
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let (stringBuffer, hadError) = _StringBuffer.fromCodeUnits(
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encoding, input: buffer, repairIllFormedSequences: isReparing)
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return stringBuffer.map {
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(result: String(_storage: $0), repairsMade: hadError)
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}
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}
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}
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/// From a non-`nil` `UnsafePointer` to a null-terminated string
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/// with possibly-transient lifetime, create a null-terminated array of 'C' char.
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/// Returns `nil` if passed a null pointer.
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@warn_unused_result
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public func _persistCString(s: UnsafePointer<CChar>) -> [CChar]? {
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if s == nil {
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return nil
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}
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let count = Int(_swift_stdlib_strlen(s))
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var result = [CChar](repeating: 0, count: count + 1)
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for i in 0..<count {
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result[i] = s[i]
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}
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return result
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}
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