custom-print.swift

// RUN: %empty-directory(%t)
// RUN: %target-swift-frontend -enable-experimental-feature Extern -enable-experimental-feature Embedded -enforce-exclusivity=none %s -c -o %t/a.o
// RUN: %target-clang %t/a.o -o %t/a.out
// RUN: %target-run %t/a.out | %FileCheck %s

// REQUIRES: swift_in_compiler
// REQUIRES: executable_test
// REQUIRES: swift_feature_Embedded
// REQUIRES: swift_feature_Extern

@_extern(c,"putchar")
@discardableResult
func putchar(_:CInt)-> CInt

public func print(_ s:StaticString, terminator:StaticString="\n") {
 var p = s.utf8Start
 while p.pointee != 0 {
 putchar(CInt(p.pointee))
 p += 1
 }
 p = terminator.utf8Start
 while p.pointee != 0 {
 putchar(CInt(p.pointee))
 p += 1
 }
}

print("Hello, Embedded Swift!")
// CHECK: Hello, Embedded Swift!