split gmtime and strftime functions.

Author: kostiakoval

Sources/POSIX/ctime.swift

@@ -10,12 +10,10 @@
 
 import func libc.time
 import func libc.ctime
-import typealias libc.time_t
 
 public func ctime() throws -> String {
-    var time = 0
-    libc.time(&time)
+    var time = libc.time(nil)
     let result = libc.ctime(&time)
 
     return String(cString: result)
-}
+}

Sources/POSIX/gmtime.swift

@@ -8,37 +8,13 @@
  See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 */
 
-import typealias libc.time_t
-import func libc.strftime
 import func libc.gmtime
 import func libc.time
+import struct libc.tm
 
-public enum StringError: ErrorProtocol {
-    case NotEnoughSpace
-}
-
-extension StringError: CustomStringConvertible {
-    public var description: String {
-        switch self {
-        case .NotEnoughSpace:
-            return "gmtime error: not enough space, increase resultSize."
-        }
-    }
-}
-
-public func gmtime(format: String, resultSize: Int = 200) throws -> String {
-    var time = 0
-    libc.time(&time)
-
-    let result = UnsafeMutablePointer<Int8>(allocatingCapacity: resultSize)
-    defer {
-        result.deallocateCapacity(resultSize)
-    }
-
+public func gmtime() -> tm {
+    var time = libc.time(nil)
     let gmTime = gmtime(&time)
-    guard libc.strftime(result, resultSize, format, gmTime) != 0 else {
-        throw StringError.NotEnoughSpace
-    }
 
-    return String(cString: result)
+    return gmTime.pointee
 }

Sources/POSIX/strftime.swift

@@ -0,0 +1,38 @@
+/*
+ This source file is part of the Swift.org open source project
+
+ Copyright 2015 - 2016 Apple Inc. and the Swift project authors
+ Licensed under Apache License v2.0 with Runtime Library Exception
+
+ See http://swift.org/LICENSE.txt for license information
+ See http://swift.org/CONTRIBUTORS.txt for Swift project authors
+*/
+
+import func libc.strftime
+import struct libc.tm
+
+public enum StringError: ErrorProtocol {
+    case NotEnoughSpace
+}
+
+extension StringError: CustomStringConvertible {
+    public var description: String {
+        switch self {
+        case .NotEnoughSpace:
+            return "gmtime error: not enough space, increase resultSize."
+        }
+    }
+}
+
+public func strftime(format: String, time: tm, resultSize: Int = 200) throws -> String {
+    var time = time
+    let result = UnsafeMutablePointer<Int8>(allocatingCapacity: resultSize)
+    defer {
+        result.deallocateCapacity(resultSize)
+    }
+    guard libc.strftime(result, resultSize, format, &time) != 0 else {
+        throw StringError.NotEnoughSpace
+    }
+
+    return String(cString: result)
+}