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//===--- Utils.swift - Utility functions ----------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2023 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
//
//===----------------------------------------------------------------------===//
//
// Utility functions that are used in the swift-backtrace program.
//
//===----------------------------------------------------------------------===//
#if canImport(Darwin)
import Darwin.C
#elseif canImport(Glibc)
import Glibc
#elseif canImport(Musl)
import Musl
#elseif canImport(CRT)
import CRT
#endif
import Swift
internal func hex<T: FixedWidthInteger>(_ value: T,
withPrefix: Bool = true) -> String {
let digits = String(value, radix: 16)
let padTo = value.bitWidth / 4
let padding = digits.count >= padTo ? "" : String(repeating: "0",
count: padTo - digits.count)
let prefix = withPrefix ? "0x" : ""
return "\(prefix)\(padding)\(digits)"
}
internal func hex(_ bytes: [UInt8]) -> String {
return bytes.map{ hex($0, withPrefix: false) }.joined(separator: "")
}
internal func parseUInt64<S: StringProtocol>(_ s: S) -> UInt64? {
if s.hasPrefix("0x") {
return UInt64(s.dropFirst(2), radix: 16)
} else if s.hasPrefix("0b") {
return UInt64(s.dropFirst(2), radix: 2)
} else if s.hasPrefix("0o") {
return UInt64(s.dropFirst(2), radix: 8)
} else {
return UInt64(s, radix: 10)
}
}
#if os(macOS) || os(Linux)
struct PosixError: Error {
var errno: Int32
var desription: String {
return String(cString: strerror(self.errno))
}
}
internal func recursiveRemoveContents(_ dir: String) throws {
guard let dirp = opendir(dir) else {
throw PosixError(errno: errno)
}
defer {
closedir(dirp)
}
while let dp = readdir(dirp) {
let name: String =
withUnsafePointer(to: &dp.pointee.d_name) {
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
let len = Int(dp.pointee.d_namlen)
#else
let len = Int(strlen($0))
#endif
return String(decoding: UnsafeRawBufferPointer(start: $0,
count: len),
as: UTF8.self)
}
if name == "." || name == ".." {
continue
}
let fullPath = "\(dir)/\(name)"
if dp.pointee.d_type == DT_DIR {
try recursiveRemove(fullPath)
} else {
if unlink(fullPath) != 0 {
throw PosixError(errno: errno)
}
}
}
}
internal func recursiveRemove(_ dir: String) throws {
try recursiveRemoveContents(dir)
if rmdir(dir) != 0 {
throw PosixError(errno: errno)
}
}
internal func withTemporaryDirectory(pattern: String, shouldDelete: Bool = true,
body: (String) throws -> ()) throws {
var buf = Array<UInt8>(pattern.utf8)
buf.append(0)
guard let dir = buf.withUnsafeMutableBufferPointer({
if let ptr = mkdtemp($0.baseAddress!) {
return String(cString: ptr)
}
return nil
}) else {
throw PosixError(errno: errno)
}
defer {
if shouldDelete {
try? recursiveRemove(dir)
}
}
try body(dir)
}
internal func spawn(_ path: String, args: [String]) throws {
var cargs = args.map{ strdup($0) }
cargs.append(nil)
let result = cargs.withUnsafeBufferPointer{
posix_spawn(nil, path, nil, nil, $0.baseAddress!, nil)
}
for arg in cargs {
free(arg)
}
if result != 0 {
throw PosixError(errno: errno)
}
}
#endif // os(macOS)
struct CFileStream: TextOutputStream {
var fp: UnsafeMutablePointer<FILE>
public func write(_ string: String) {
fputs(string, fp)
}
public func flush() {
fflush(fp)
}
}
var standardOutput = CFileStream(fp: stdout)
var standardError = CFileStream(fp: stderr)
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