lib: Added o_stream_nsend_istream()

src/lib/ostream.c

@@ -374,6 +374,27 @@ int o_stream_send_istream(struct ostream *outstream, struct istream *instream)
 	return ret;
 }
 
+void o_stream_nsend_istream(struct ostream *outstream, struct istream *instream)
+{
+	switch (o_stream_send_istream(outstream, instream)) {
+	case 1:
+		break;
+	case 0:
+		outstream->real_stream->noverflow = TRUE;
+		break;
+	default:
+		if (outstream->stream_errno != 0)
+			break;
+		i_assert(instream->stream_errno != 0);
+		outstream->stream_errno = instream->stream_errno;
+		io_stream_set_error(&outstream->real_stream->iostream,
+			"nsend-istream: read(%s) failed: %s",
+			i_stream_get_name(instream),
+			o_stream_get_name(outstream));
+	}
+	outstream->real_stream->last_errors_not_checked = TRUE;
+}
+
 int o_stream_pwrite(struct ostream *stream, const void *data, size_t size,
 		    uoff_t offset)
 {

src/lib/ostream.h

@@ -161,6 +161,10 @@ void o_stream_set_no_error_handling(struct ostream *stream, bool set);
    descriptor, even if the source and destination overlaps. If the file must
    be grown, you have to do it manually before calling this function. */
 int o_stream_send_istream(struct ostream *outstream, struct istream *instream);
+/* Same as o_stream_send_istream(), but assume that reads and writes will
+   succeed. If not, o_stream_nfinish() will fail with the correct error
+   message (even istream's). */
+void o_stream_nsend_istream(struct ostream *outstream, struct istream *instream);
 
 /* Write data to specified offset. Returns 0 if successful, -1 if error. */
 int o_stream_pwrite(struct ostream *stream, const void *data, size_t size,