remove trailing blank lines in write_file - change check_bound

1 files changed, 7 insertions, 2 deletions

diff --git a/lineset.c b/lineset.c
index 0d810b8..349504c 100644
--- a/lineset.c
+++ b/lineset.c
@@ -144,13 +144,18 @@ void copy_lines_to_ring(int y1, int y2, int which){
 	else
 		idx = undo_cur + 1;
 	if (idx >= undo_sz - 1){
-		undo_sz += 10;
-		tmp = realloc(undo, undo_sz * sizeof(lineset_t));
+		tmp = realloc(undo, (undo_sz + 10) * sizeof(lineset_t));
 		if (tmp == NULL){
 			fprintf(stderr, "Error allocating undo buffer");
 			exit(1);
 		}
 		undo = tmp;
+		for (i=0; i<10; i++){
+			undo[undo_sz + i].sz = 0;
+			undo[undo_sz + i].l = NULL;
+			undo[undo_sz + i].num = 0;
+		}
+		undo_sz += 10;
 	}
 	ensure_num_lines(&(undo[idx]), y2 - y1 + 1);
 	for(i=y1; i<=y2; i++){