[core/os2]: Reading from unsized files

core/os/os2/errors.odin

@@ -13,6 +13,10 @@ General_Error :: enum u32 {
 
 	Timeout,
 
+	// Indicates that an attempt to retrieve a file's size was made, but the
+	// file doesn't have a size.
+	No_Size,
+
 	Invalid_File,
 	Invalid_Dir,
 	Invalid_Path,
@@ -22,9 +26,15 @@ General_Error :: enum u32 {
 
 Platform_Error :: enum i32 {None=0}
 
+Read_Error :: enum u32 {
+	None,
+	Broken_Pipe,
+}
+
 Error :: union #shared_nil {
 	General_Error,
 	io.Error,
+	Read_Error,
 	runtime.Allocator_Error,
 	Platform_Error,
 }
@@ -51,6 +61,7 @@ error_string :: proc(ferr: Error) -> string {
 		case .Not_Exist:         return "file does not exist"
 		case .Closed:            return "file already closed"
 		case .Timeout:           return "i/o timeout"
+		case .No_Size:           return "file has no definite size"
 		case .Invalid_File:      return "invalid file"
 		case .Invalid_Dir:       return "invalid directory"
 		case .Invalid_Path:      return "invalid path"
@@ -82,6 +93,11 @@ error_string :: proc(ferr: Error) -> string {
 		case .Invalid_Argument:     return "invalid allocator argument"
 		case .Mode_Not_Implemented: return "allocator mode not implemented"
 		}
+	case Read_Error:
+		switch e {
+			case .None:             return ""
+			case .Broken_Pipe:      return "Broken pipe"
+		}
 	case Platform_Error:
 		return _error_string(i32(e))
 	}