Fix handling of deferred write errors that happen when closing

1 files changed, 8 insertions, 4 deletions

diff --git a/include/serd/serd.h b/include/serd/serd.h
index d606f4bb..35d31a57 100644
--- a/include/serd/serd.h
+++ b/include/serd/serd.h
@@ -2201,8 +2201,8 @@ serd_node_to_syntax(const SerdNode* SERD_NONNULL node,
 /// An input stream that produces bytes
 typedef struct {
   void* SERD_NULLABLE         stream; ///< Opaque parameter for functions
-  SerdReadFunc SERD_NULLABLE  read;   ///< Read bytes to input
-  SerdErrorFunc SERD_NONNULL  error;  ///< Stream error accessor
+  SerdReadFunc SERD_NONNULL   read;   ///< Read bytes from input
+  SerdErrorFunc SERD_NULLABLE error;  ///< Stream error accessor
   SerdCloseFunc SERD_NULLABLE close;  ///< Close input
 } SerdInputStream;
 
@@ -2468,7 +2468,8 @@ serd_buffer_close(void* SERD_NONNULL stream);
 /// An output stream that receives bytes
 typedef struct {
   void* SERD_NULLABLE         stream; ///< Opaque parameter for functions
-  SerdWriteFunc SERD_NULLABLE write;  ///< Write bytes to output
+  SerdWriteFunc SERD_NONNULL  write;  ///< Write bytes to output
+  SerdErrorFunc SERD_NULLABLE error;  ///< Stream error accessor
   SerdCloseFunc SERD_NULLABLE close;  ///< Close output
 } SerdOutputStream;
 
@@ -2476,6 +2477,7 @@ typedef struct {
    Open a stream that writes to a provided function.
 
    @param write_func Function to write output.
+   @param error_func Function used to detect errors.
    @param close_func Function to close the stream after writing is done.
    @param stream Opaque stream parameter for write_func and close_func.
 
@@ -2484,6 +2486,7 @@ typedef struct {
 SERD_CONST_API
 SerdOutputStream
 serd_open_output_stream(SerdWriteFunc SERD_NONNULL  write_func,
+                        SerdErrorFunc SERD_NULLABLE error_func,
                         SerdCloseFunc SERD_NULLABLE close_func,
                         void* SERD_NULLABLE         stream);
 
@@ -2519,7 +2522,8 @@ serd_open_output_file(const char* SERD_NONNULL path);
 
    This will call the close function, and reset the stream internally so that
    no further writes can be made.  For convenience, this is safe to call on
-   NULL, and safe to call several times on the same output.
+   NULL, and safe to call several times on the same output.  Failure is
+   returned in both of those cases.
 */
 SERD_API
 SerdStatus