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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftShims
// TODO: This is all a stop-gap so that at least some types are printable in
// embedded Swift, in an embedded-programming friendly way (we mainly need
// printing to not need to heap allocate).
@_silgen_name("putchar")
@discardableResult
func putchar(_: CInt) -> CInt
public func print(_ string: StaticString, terminator: StaticString = "\n") {
var p = string.utf8Start
while p.pointee != 0 {
putchar(CInt(p.pointee))
p += 1
}
p = terminator.utf8Start
while p.pointee != 0 {
putchar(CInt(p.pointee))
p += 1
}
}
func printCharacters(_ buf: UnsafeRawBufferPointer) {
for c in buf {
putchar(CInt(c))
}
}
func printCharacters(_ buf: UnsafeBufferPointer<UInt8>) {
printCharacters(UnsafeRawBufferPointer(buf))
}
extension BinaryInteger {
func writeToStdout() {
if self == (0 as Self) {
print("0", terminator: "")
return
}
func _ascii(_ digit: UInt8) -> UInt8 {
UInt8(("0" as Unicode.Scalar).value) + digit
}
let isNegative = Self.isSigned && self < (0 as Self)
var value = magnitude
// Avoid withUnsafeTemporaryAllocation which is not typed-throws ready yet
let byteCount = 64
let stackBuffer = Builtin.stackAlloc(byteCount._builtinWordValue,
1._builtinWordValue, 1._builtinWordValue)
let buffer = UnsafeMutableRawBufferPointer(start: .init(stackBuffer),
count: byteCount)
var index = buffer.count - 1
while value != 0 {
let (quotient, remainder) =
value.quotientAndRemainder(dividingBy: Magnitude(10))
buffer[index] = _ascii(UInt8(truncatingIfNeeded: remainder))
index -= 1
value = quotient
}
if isNegative {
buffer[index] = UInt8(("-" as Unicode.Scalar).value)
index -= 1
}
let start = index + 1
let end = buffer.count - 1
let count = end - start + 1
let pointerToPrint = buffer.baseAddress?.advanced(by: start)
.assumingMemoryBound(to: UInt8.self)
printCharacters(UnsafeBufferPointer(start: pointerToPrint, count: count))
Builtin.stackDealloc(stackBuffer)
}
}
public func print(_ integer: some BinaryInteger, terminator: StaticString = "\n") {
integer.writeToStdout()
print("", terminator: terminator)
}
public func print(_ boolean: Bool, terminator: StaticString = "\n") {
if boolean {
print("true", terminator: terminator)
} else {
print("false", terminator: terminator)
}
}
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