From 7683c1f4bb284e54d668b7a63a7204c7df30d5d6 Mon Sep 17 00:00:00 2001
From: Feoramund <161657516+Feoramund@users.noreply.github.com>
Date: Thu, 22 Aug 2024 17:32:30 -0400
Subject: [PATCH] Report `Invalid_Whence` in `os2` POSIX seek

---
 core/os/os2/file_posix.odin | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/core/os/os2/file_posix.odin b/core/os/os2/file_posix.odin
index 26bcb111c..dae85d224 100644
--- a/core/os/os2/file_posix.odin
+++ b/core/os/os2/file_posix.odin
@@ -419,9 +419,22 @@ _file_stream_proc :: proc(stream_data: rawptr, mode: io.Stream_Mode, p: []byte,
 		#assert(int(posix.Whence.CUR) == int(io.Seek_From.Current))
 		#assert(int(posix.Whence.END) == int(io.Seek_From.End))
 
+		switch whence {
+		case .Start, .Current, .End:
+			break
+		case:
+			err = .Invalid_Whence
+			return
+		}
+
 		n = i64(posix.lseek(fd, posix.off_t(offset), posix.Whence(whence)))
 		if n < 0 {
-			err = .Unknown
+			#partial switch posix.get_errno() {
+			case .EINVAL:
+				err = .Invalid_Offset
+			case:
+				err = .Unknown
+			}
 		}
 		return