[wasm] Miscellaneous Foundation fixes

Sources/Foundation/Host.swift

@@ -91,6 +91,8 @@ open class Host: NSObject {
  return "localhost"
  }
  return String(cString: hostname)
+#elseif os(WASI) // WASI does not have uname
+ return "localhost"
 #else
  let hname = UnsafeMutablePointer<Int8>.allocate(capacity: Int(NI_MAXHOST))
  defer {
@@ -170,6 +172,9 @@ open class Host: NSObject {
  }
  _names = [info]
  _resolved = true
+#elseif os(WASI) // WASI does not have getifaddrs
+ _names = [info]
+ _resolved = true
 #else
  var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
  if getifaddrs(&ifaddr) != 0 {
@@ -267,6 +272,11 @@ open class Host: NSObject {
 
  _resolved = true
  }
+#elseif os(WASI) // WASI does not have getaddrinfo
+ if let info = _info {
+ _names = [info]
+ _resolved = true
+ }
 #else
  if let info = _info {
  var flags: Int32 = 0

Sources/Foundation/NSCharacterSet.swift

@@ -184,7 +184,6 @@ open class NSCharacterSet : NSObject, NSCopying, NSMutableCopying, NSSecureCodin
  _CFCharacterSetInitWithBitmapRepresentation(_cfMutableObject, data._cfObject)
  }
 
-#if !os(WASI)
  public convenience init?(contentsOfFile fName: String) {
  do {
  let data = try Data(contentsOf: URL(fileURLWithPath: fName))
@@ -330,7 +329,6 @@ open class NSCharacterSet : NSObject, NSCopying, NSMutableCopying, NSSecureCodin
  aCoder.encode(true, forKey: .characterSetIsInvertedKey)
  }
  }
-#endif
 
  open func characterIsMember(_ aCharacter: unichar) -> Bool {
  return longCharacterIsMember(UInt32(aCharacter))

Sources/Foundation/NSKeyedArchiver.swift

@@ -150,10 +150,6 @@ open class NSKeyedArchiver : NSCoder {
  /// - Returns: `true` if the operation was successful, otherwise `false`.
  @available(swift, deprecated: 9999, renamed: "archivedData(withRootObject:requiringSecureCoding:)")
  open class func archiveRootObject(_ rootObject: Any, toFile path: String) -> Bool {
-#if os(WASI)
- assertionFailure("\(#function) does not support file access on WASI")
- return false
-#else
  var fd : Int32 = -1
  var auxFilePath : String
  var finishedEncoding : Bool = false
@@ -187,7 +183,6 @@ open class NSKeyedArchiver : NSCoder {
  finishedEncoding = keyedArchiver._flags.contains(.finishedEncoding)
 
  return finishedEncoding
-#endif
  }
 
  public convenience init(requiringSecureCoding: Bool) {
@@ -228,13 +223,8 @@ open class NSKeyedArchiver : NSCoder {
  success = true
  }
  } else {
-#if !os(WASI)
  let stream = unsafeBitCast(self._stream, to: CFWriteStream.self)
  success = CFPropertyListWrite(plist, stream, kCFPropertyListXMLFormat_v1_0, 0, nil) > 0
-#else
- assertionFailure("\(#function) only supports data streams on WASI")
- return false
-#endif
  }
 
  return success

Sources/Foundation/NSPathUtilities.swift

@@ -75,11 +75,9 @@ public func NSTemporaryDirectory() -> String {
  }
  }
 #endif
-#if !os(WASI)
  if let tmpdir = ProcessInfo.processInfo.environment["TMPDIR"] {
  return normalizedPath(with: tmpdir)
  }
-#endif
 #if os(Android)
  // Bionic uses /data/local/tmp/ as temporary directory. TMPDIR is rarely
  // defined.
@@ -433,7 +431,6 @@ extension NSString {
  return paths.map(appendingPathComponent)
  }
 
-#if !os(WASI)
  /// - Experiment: This is a draft API currently under consideration for official import into Foundation
  /// - Note: Since this API is under consideration it may be either removed or revised in the near future
  public func completePath(into outputName: inout String?, caseSensitive flag: Bool, matchesInto outputArray: inout [String], filterTypes: [String]?) -> Int {
@@ -536,7 +533,6 @@ extension NSString {
  return { $0.lowercased().hasPrefix(prefix) }
  }
  }
-#endif
 
  internal func _longestCommonPrefix(_ strings: [String], caseSensitive: Bool) -> String? {
  guard !strings.isEmpty else {
@@ -584,11 +580,9 @@ extension NSString {
  return path + "/"
  }
 
-#if !os(WASI)
  public var fileSystemRepresentation: UnsafePointer<Int8> {
  return FileManager.default.fileSystemRepresentation(withPath: self._swiftObject)
  }
-#endif
 
  public func getFileSystemRepresentation(_ cname: UnsafeMutablePointer<Int8>, maxLength max: Int) -> Bool {
 #if os(Windows)

Sources/Foundation/NSString.swift

@@ -25,11 +25,7 @@ func NSLocalizedString(_ key: String,
  bundle: Bundle = Bundle.main,
  value: String = "",
  comment: String) -> String {
-#if os(WASI)
- return key
-#else
  return bundle.localizedString(forKey: key, value: value, table: tableName)
-#endif
 }
 
 internal let kCFStringEncodingMacRoman = CFStringBuiltInEncodings.macRoman.rawValue

Sources/Foundation/ScannerAPI.swift

@@ -43,7 +43,7 @@ extension Scanner {
  if let value = scanInt64(representation: representation) {
  return Int(value)
  }
- #elseif arch(i386) || arch(arm)
+ #elseif arch(i386) || arch(arm) || arch(wasm32)
  if let value = scanInt32(representation: representation) {
  return Int(value)
  }