Improve Launchctl error reporting

Launchctl/Sources/SpellbookLaunchctl/Internals/Error.swift

@@ -22,10 +22,13 @@
 
 import Foundation
 
+@_silgen_name("xpc_strerror")
+private func xpc_strerror(_ error: Int32) -> UnsafePointer<CChar>
+
 extension NSError {
     internal convenience init(launchctlExitCode: Int32, stderr: String, underlyingError: Error? = nil) {
         var userInfo: [String: Any] = [
-            NSDebugDescriptionErrorKey: Self.xpc_strerr(launchctlExitCode),
+            NSDebugDescriptionErrorKey: String(cString: xpc_strerror(launchctlExitCode)),
             "stderr": stderr,
         ]
         if let underlyingError {
@@ -34,119 +37,4 @@ extension NSError {
 
         self.init(domain: Launchctl.errorDomain, code: Int(launchctlExitCode), userInfo: userInfo)
     }
-
-    private static func xpc_strerr(_ code: Int32) -> String {
-        switch code {
-        case 0..<107:
-            return String(cString: strerror(code))
-        case 107:
-            return "Malformed bundle"
-        case 108:
-            return "Invalid path"
-        case 109:
-            return "Invalid property list"
-        case 110:
-            return "Invalid or missing service identifier"
-        case 111:
-            return "Invalid or missing Program/ProgramArguments"
-        case 112:
-            return "Could not find specified domain"
-        case 113:
-            return "Could not find specified service"
-        case 114:
-            return "The specified username does not exist"
-        case 115:
-            return "The specified group does not exist"
-        case 116:
-            return "Routine not yet implemented"
-        case 117:
-            return "(n/a)"
-        case 118:
-            return "Bad response from server"
-        case 119:
-            return "Service is disabled"
-        case 120:
-            return "Bad subsystem destination for request"
-        case 121:
-            return "Path not searched for services"
-        case 122:
-            return "Path had bad ownership/permissions"
-        case 123:
-            return "Path is whitelisted for domain"
-        case 124:
-            return "Domain is tearing down"
-        case 125:
-            return "Domain does not support specified action"
-        case 126:
-            return "Request type is no longer supported"
-        case 127:
-            return "The specified service did not ship with the operating system"
-        case 128:
-            return "The specified path is not a bundle"
-        case 129:
-            return "The service was superseded by a later later version"
-        case 130:
-            return "The system encountered a condition where behavior was undefined"
-        case 131:
-            return "Out of order requests"
-        case 132:
-            return "Request for stale data"
-        case 133:
-            return "Multiple errors were returned; see stderr"
-        case 134:
-            return "Service cannot load in requested session"
-        case 135:
-            return "Process is not managed"
-        case 136:
-            return "Action not allowed on singleton service"
-        case 137:
-            return "Service does not support the specified action"
-        case 138:
-            return "Service cannot be loaded on this hardware"
-        case 139:
-            return "Service cannot presently execute"
-        case 140:
-            return "Service name is reserved or invalid"
-        case 141:
-            return "Reentrancy avoided"
-        case 142:
-            return "Operation only supported on development"
-        case 143:
-            return "Requested entry was cached"
-        case 144:
-            return "Requestor lacks required entitlement"
-        case 145:
-            return "Endpoint is hidden"
-        case 146:
-            return "Domain is in on-demand-only mode"
-        case 147:
-            return "The specified service did not ship in the requestor"
-        case 148:
-            return "The specified service path was not in the service cache"
-        case 149:
-            return "Could not find a bundle of the given identifier through LaunchServices"
-        case 150:
-            return "Operation not permitted while System Integrity Protection is engaged"
-        case 151:
-            return "A complete hack"
-        case 152:
-            return "Service cannot load in current boot environment"
-        case 153:
-            return "Completely unexpected error"
-        case 154:
-            return "Requestor is not a platform binary"
-        case 155:
-            return "Refusing to execute/trust quarantined program/file"
-        case 156:
-            return "Domain creation with that UID is not allowed anymore"
-        case 157:
-            return "System service is not in system service whitelist"
-        case 158:
-            return "Service cannot be loaded on current os variant"
-        case 159:
-            return "Unknown error"
-        default:
-            return "unknown error code"
-        }
-    }
 }