Replace stat call with NSFileManager API on Apple target

core/apple/src/files/FileSystemApple.kt

@@ -11,7 +11,7 @@ import kotlinx.cinterop.cstr
 import kotlinx.cinterop.memScoped
 import kotlinx.cinterop.toKString
 import kotlinx.io.IOException
-import platform.Foundation.NSTemporaryDirectory
+import platform.Foundation.*
 import platform.posix.*
 
 
@@ -55,3 +55,15 @@ internal actual fun realpathImpl(path: String): String {
         free(res)
     }
 }
+
+internal actual fun metadataOrNullImpl(path: Path): FileMetadata? {
+    val attributes = NSFileManager.defaultManager().fileAttributesAtPath(path.path, traverseLink = true) ?: return null
+    val fileType = attributes[NSFileType] as String
+    val isFile = fileType == NSFileTypeRegular
+    val isDir = fileType == NSFileTypeDirectory
+    return FileMetadata(
+        isRegularFile = isFile,
+        isDirectory = isDir,
+        size = if (isFile) attributes[NSFileSize] as Long else -1
+    )
+}

core/native/src/files/FileSystemNative.kt

@@ -63,23 +63,7 @@ public actual val SystemFileSystem: FileSystem = object : SystemFileSystemImpl()
         atomicMoveImpl(source, destination)
     }
 
-    @OptIn(ExperimentalForeignApi::class, UnsafeNumber::class)
-    override fun metadataOrNull(path: Path): FileMetadata? {
-        memScoped {
-            val struct_stat = alloc<stat>()
-            if (stat(path.path, struct_stat.ptr) != 0) {
-                if (errno == ENOENT) return null
-                throw IOException("stat failed to ${path.path}: ${strerror(errno)?.toKString()}")
-            }
-            val mode = struct_stat.st_mode.toInt()
-            val isFile = (mode and S_IFMT) == S_IFREG
-            return FileMetadata(
-                isRegularFile = isFile,
-                isDirectory = (mode and S_IFMT) == S_IFDIR,
-                if (isFile) struct_stat.st_size.toLong() else -1L
-            )
-        }
-    }
+    override fun metadataOrNull(path: Path): FileMetadata? = metadataOrNullImpl(path)
 
     override fun resolve(path: Path): Path {
         if (!exists(path)) throw FileNotFoundException(path.path)
@@ -104,6 +88,8 @@ public actual val SystemFileSystem: FileSystem = object : SystemFileSystemImpl()
     }
 }
 
+internal expect fun metadataOrNullImpl(path: Path): FileMetadata?
+
 internal expect fun atomicMoveImpl(source: Path, destination: Path)
 
 internal expect fun mkdirImpl(path: String)

core/nonApple/src/files/FileSystemNonApple.kt

@@ -5,10 +5,28 @@
 
 package kotlinx.io.files
 
-import kotlinx.cinterop.ExperimentalForeignApi
-import kotlinx.cinterop.toKString
-import platform.posix.getenv
+import kotlinx.cinterop.*
+import kotlinx.io.IOException
+import platform.posix.*
 
 @OptIn(ExperimentalForeignApi::class)
 public actual val SystemTemporaryDirectory: Path
     get() = Path(getenv("TMPDIR")?.toKString() ?: getenv("TMP")?.toKString() ?: "")
+
+@OptIn(ExperimentalForeignApi::class, UnsafeNumber::class)
+internal actual fun metadataOrNullImpl(path: Path): FileMetadata? {
+    memScoped {
+        val struct_stat = alloc<stat>()
+        if (stat(path.path, struct_stat.ptr) != 0) {
+            if (errno == ENOENT) return null
+            throw IOException("stat failed to ${path.path}: ${strerror(errno)?.toKString()}")
+        }
+        val mode = struct_stat.st_mode.toInt()
+        val isFile = (mode and S_IFMT) == S_IFREG
+        return FileMetadata(
+            isRegularFile = isFile,
+            isDirectory = (mode and S_IFMT) == S_IFDIR,
+            if (isFile) struct_stat.st_size.toLong() else -1L
+        )
+    }
+}