POSIX error asserters and minor improvements in other classes

lib/closeable-state

@@ -1 +1 @@
-Subproject commit 4b799c0ecfac0d501ce335147c2ed021e5d4bea9
+Subproject commit e57851782134ca0613646efdf7b44d2e5a23de08

src/posixMain/kotlin/ru/landgrafhomyak/utility/kotlin_native_interop_stdlib_0/posix/PosixApiException.kt

@@ -2,7 +2,7 @@ package ru.landgrafhomyak.utility.kotlin_native_interop_stdlib_0.posix
 
 import kotlinx.cinterop.ExperimentalForeignApi
 import kotlinx.cinterop.toKStringFromUtf8
-import platform.posix.errno
+import platform.posix.errno as native_errnoVar
 import platform.posix.strerror
 import ru.landgrafhomyak.utility.kotlin_native_interop_stdlib_0.OsException
 
@@ -31,20 +31,22 @@ public class PosixApiException : OsException {
 	}
 
 	override fun toString(): String =
-		"<windows api exception errno=${this.errno}>"
+		"<posix api exception errno=${this.errno}>"
 
 	public companion object {
-		public fun throwFromLastWindowsErr(): Nothing {
-			throw this.formatFromLastWindowsErr()
+		public fun getLastErrno(): Int = native_errnoVar
+
+		public fun throwFromLastPosixErr(): Nothing {
+			throw this.formatFromLastPosixErr()
 		}
 
-		public fun throwFromWindowsErrCode(code: Int): Nothing {
-			throw this.formatFromWindowsErrCode(code)
+		public fun throwFromPosixErrCode(code: Int): Nothing {
+			throw this.formatFromPosixErrCode(code)
 		}
 
-		public fun formatFromLastWindowsErr(): PosixApiException = this.formatFromWindowsErrCode(errno)
+		public fun formatFromLastPosixErr(): PosixApiException = this.formatFromPosixErrCode(native_errnoVar)
 
-		public fun formatFromWindowsErrCode(code: Int): PosixApiException {
+		public fun formatFromPosixErrCode(code: Int): PosixApiException {
 			var err = PosixApiException(errno = code, nativeMessage = null, customMessage = "[errno=${code}]")
 			try {
 				val nativeMessage = this.getNativeMessageByErrno(code)
@@ -61,7 +63,7 @@ public class PosixApiException : OsException {
 			if (raw != null) {
 				return raw.toKStringFromUtf8()
 			} else {
-				val strerrErrno = errno
+				val strerrErrno = native_errnoVar
 				throw PosixApiException(errno = strerrErrno, nativeMessage = null, "[errno=${strerrErrno}]")
 			}
 		}

src/posixMain/kotlin/ru/landgrafhomyak/utility/kotlin_native_interop_stdlib_0/posix/error_asserters.kt

@@ -0,0 +1,56 @@
+@file:OptIn(ExperimentalContracts::class)
+
+package ru.landgrafhomyak.utility.kotlin_native_interop_stdlib_0.posix
+
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
+import kotlinx.cinterop.ExperimentalForeignApi
+
+
+private fun _checkErrnoAndThrow(): Nothing {
+	val code = PosixApiException.getLastErrno()
+	if (code == 0)
+		throw RuntimeException("Function returned error status, but no error set")
+	PosixApiException.throwFromLastPosixErr()
+}
+
+public fun Int.zeroToWinApiErr(): Int {
+	if (this != 0)
+		return this
+
+	_checkErrnoAndThrow()
+}
+
+public fun zeroToWinApiErr(call: () -> Int): Int {
+	contract {
+		callsInPlace(call, InvocationKind.EXACTLY_ONCE)
+	}
+
+	val status = call()
+	if (status != 0)
+		return status
+
+	_checkErrnoAndThrow()
+}
+
+@OptIn(ExperimentalForeignApi::class)
+public fun <R : Any> R?.nullToWinApiErr(): R {
+	if (this != null)
+		return this
+
+	_checkErrnoAndThrow()
+}
+
+@OptIn(ExperimentalForeignApi::class)
+public fun <R : Any> nullToWinApiErr(call: () -> R?): R {
+	contract {
+		callsInPlace(call, InvocationKind.EXACTLY_ONCE)
+	}
+
+	val ref = call()
+	if (ref != null)
+		return ref
+
+	_checkErrnoAndThrow()
+}

src/windowsMain/kotlin/ru/landgrafhomyak/utility/kotlin_native_interop_stdlib_0/windows/WindowsApiException.kt

@@ -9,6 +9,7 @@ import kotlinx.cinterop.ptr
 import kotlinx.cinterop.reinterpret
 import kotlinx.cinterop.toKString
 import kotlinx.cinterop.value
+import platform.posix.errno
 import platform.windows.FORMAT_MESSAGE_ALLOCATE_BUFFER
 import platform.windows.FORMAT_MESSAGE_FROM_SYSTEM
 import platform.windows.FORMAT_MESSAGE_IGNORE_INSERTS
@@ -46,6 +47,8 @@ public class WindowsApiException : OsException {
 		"<windows api exception errno=${this.errno}>"
 
 	public companion object {
+		public fun getLastErrno(): UInt = GetLastError()
+
 		public fun throwFromLastWindowsErr(): Nothing {
 			throw this.formatFromLastWindowsErr()
 		}

src/windowsMain/kotlin/ru/landgrafhomyak/utility/kotlin_native_interop_stdlib_0/windows/WindowsHandleWrapper.kt

@@ -9,6 +9,7 @@ import platform.windows.HANDLE
 import ru.landgrafhomyak.utility.closeable_state_1.CloseableState
 import ru.landgrafhomyak.utility.closeable_state_1.HandleWrapper
 import ru.landgrafhomyak.utility.closeable_state_1.ManualStateManipulation
+import ru.landgrafhomyak.utility.highlevel_try_finally.safeAutoClose1
 
 @OptIn(ExperimentalForeignApi::class)
 public class WindowsHandleWrapper(
@@ -32,4 +33,21 @@ public class WindowsHandleWrapper(
 		this._orig.close()
 		zeroToWinApiErr { CloseHandle(this._orig.handle) }
 	}
+
+	public companion object {
+		@OptIn(ExperimentalContracts::class, ManualStateManipulation::class)
+		public fun <R> autoClosed(state: () -> CloseableState, constructor: () -> HANDLE, block: (WindowsHandleWrapper) -> R) {
+			contract {
+				callsInPlace(state, InvocationKind.EXACTLY_ONCE)
+				callsInPlace(constructor, InvocationKind.EXACTLY_ONCE)
+				callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+			}
+
+			val wrapper = WindowsHandleWrapper(constructor(), state())
+			safeAutoClose1(
+				action = { block(wrapper) },
+				finally = { wrapper.close() }
+			)
+		}
+	}
 }

src/windowsMain/kotlin/ru/landgrafhomyak/utility/kotlin_native_interop_stdlib_0/windows/error_asserters.kt

@@ -7,11 +7,10 @@ import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 import kotlinx.cinterop.ExperimentalForeignApi
 import platform.windows.ERROR_SUCCESS
-import platform.windows.GetLastError
 import platform.windows.NULL
 
 private fun _checkErrnoAndThrow(): Nothing {
-	val code = GetLastError()
+	val code = WindowsApiException.getLastErrno()
 	if (code == ERROR_SUCCESS.toUInt())
 		throw RuntimeException("Function returned error status, but no error set")
 	WindowsApiException.throwFromLastWindowsErr()