/****************************************************************************
- * Copyright 2019-2020,2021 Thomas E. Dickey *
+ * Copyright 2019-2021,2023 Thomas E. Dickey *
* Copyright 2001-2016,2017 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
#include <tic.h>
#include <ctype.h>
-MODULE_ID("$Id: visbuf.c,v 1.53 2021/02/27 20:07:57 tom Exp $")
+MODULE_ID("$Id: visbuf.c,v 1.54 2023/05/27 20:13:10 tom Exp $")
#define NUM_VISBUFS 4
static char *
_nc_vischar(char *tp, unsigned c LIMIT_ARG)
{
- if (c == '"' || c == '\\') {
+ if (tp == NULL) {
+ return NULL;
+ } else if (c == '"' || c == '\\') {
*tp++ = '\\';
*tp++ = (char) c;
} else if (is7bits((int) c) && (isgraph((int) c) || c == ' ')) {