Handle an error

1 files changed, 4 insertions, 0 deletions

diff --git a/bmp.c b/bmp.c
index abc0db5..33dd7dc 100644
--- a/bmp.c
+++ b/bmp.c
@@ -93,6 +93,10 @@ void map_to_bmp(Map map, size_t map_width, size_t map_height, Position start, Po
 
 
     FILE *fout = fopen(filename, "wb");
+    if (fout == NULL) {
+        message(height, "Couldn't open %s for writing", filename);
+        return;
+    }
     fwrite(header, 1, 54, fout);
     fwrite((char*)buf, 1, imagesize, fout);
     fclose(fout);