[fcformat] Add element filtering and deletion

The filtering, '%{+elt1,elt2,elt3{subexpr}}' will evaluate subexpr
with a pattern only having the listed elements from the surrounding
pattern.

The deletion, '%{-elt1,elt2,elt3{subexpr}}' will evaluate subexpr
with a the surrounding pattern sans the listed elements.

1 files changed, 5 insertions, 2 deletions

diff --git a/fc-list/fc-list.c b/fc-list/fc-list.c
index 470b4b93..cbcc3c0d 100644
--- a/fc-list/fc-list.c
+++ b/fc-list/fc-list.c
@@ -178,8 +178,11 @@ main (int argc, char **argv)
 	        FcChar8 *s;
 
 		s = FcPatternFormat (fs->fonts[j], format);
-		printf ("%s", s);
-		free (s);
+		if (s)
+		{
+		    printf ("%s", s);
+		    free (s);
+		}
 	    }
 	    else
 	    {