Add some warnings

1 files changed, 11 insertions, 0 deletions

diff --git a/src/frame.c b/src/frame.c
index dbe392d..fc2fefc 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -928,6 +928,12 @@ size_t pos_trail_to_offset(Paragraph *para, size_t offs, int trail)
 	char *ptr;
 
 	nrun = which_run(para, offs);
+
+	if ( nrun == para->n_runs ) {
+		fprintf(stderr, "pos_trail_to_offset: Offset too high\n");
+		return 0;
+	}
+
 	run = &para->runs[nrun];
 
 	if ( para->type != PARA_TYPE_TEXT ) return 0;
@@ -937,6 +943,11 @@ size_t pos_trail_to_offset(Paragraph *para, size_t offs, int trail)
 		return 0;
 	}
 
+	if ( run->scblock == NULL ) {
+		fprintf(stderr, "pos_trail_to_offset: SCBlock = NULL?\n");
+		return 0;
+	}
+
 	if ( (sc_block_name(run->scblock) != NULL)
 	  && (strcmp(sc_block_name(run->scblock), "newpara") == 0) )
 	{