From a31e562fd489e0ea515caea13979a64d871be9b5 Mon Sep 17 00:00:00 2001
From: Harald Oehlmann <oehhar@sourceforge.net>
Date: Mon, 7 Dec 2015 22:41:40 +0100
Subject: [PATCH] "Fix stdout handling for png output", 2012-08-06 from
 https://github.com/zint/zint/commit/fdb8b4e30e6a5a109a0a72cc664936ff1f7fe5cb

---
 backend/png.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/backend/png.c b/backend/png.c
index 7f83237f..84c19c26 100644
--- a/backend/png.c
+++ b/backend/png.c
@@ -307,7 +307,11 @@ int png_pixel_plot(struct zint_symbol *symbol, int image_height, int image_width
 
 	/* make sure we have disengaged */
 	if (png_ptr && info_ptr) png_destroy_write_struct(&png_ptr, &info_ptr);
-	fclose(wpng_info.outfile);
+	if(symbol->output_options & BARCODE_STDOUT) {
+		fflush(wpng_info.outfile);
+	} else {
+		fclose(wpng_info.outfile);
+	}
 	return 0;
 }
 #endif /* NO_PNG */