Move crude input shims to InputStream.swift

We need to replace and flush input streaming later with genuine parsing.

Swift SVN r3170

Author: davezarzycki

stdlib/InputStream.swift

@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+// InputStream
+//===----------------------------------------------------------------------===//
+
+// XXX FIXME -- replace and flush this out with parsing logic
+
+class Keyboard {
+  func read(buf : UInt8[]) -> Int {
+    var r = posix_read(0, buf.base.value, buf.length)
+    assert(r >= 0)
+    return r
+  }
+
+  func read() -> Int {
+    var c = new UInt8[1]
+    if read(c) != 1 {
+      return -1
+    }
+    return Int(c[0])
+  }
+}
+
+extension Keyboard {
+  func getline() -> String {
+    return getline('\n')
+  }
+
+  func getline(delim : Char) -> String {
+    var r : String
+    var i = read()
+    while i != -1 {
+      var c = Char(i)
+      if c == delim {
+        break
+      }
+      r = r + c
+      i = read()
+    }
+    return r
+  }
+}
+
+var kbd : Keyboard = new Keyboard

stdlib/Makefile

@@ -18,7 +18,7 @@ LINK_LIBS_IN_SHARED := 1
 SHARED_LIBRARY := 1
 SWIFT_SOURCES := Bool.swift FixedPoint.swift FloatingPoint.swift Misc.swift \
 		 String.swift Dictionary.swift Vector.swift Algorithm.swift \
-		 Demangle.swift OutputStream.swift \
+		 Demangle.swift InputStream.swift OutputStream.swift \
 		 POSIX/Descriptor.swift POSIX/File.swift POSIX/Misc.swift
 SOURCES := swift.swift
 NO_BUILD_ARCHIVE := 1