static void cleanup __P ((void));
static void first_last_page __P ((char *pages));
static void print_sep_string __P ((void));
-static void separator_string (char *optarg_S);
+static void separator_string __P ((const char *optarg_S));
/* The name under which this program was invoked. */
char *program_name;
/* Estimate length of col_sep_string with option -s[STRING] */
static void
-separator_string (char *optarg_S)
+separator_string (const char *optarg_S)
{
col_sep_length = (int) strlen (optarg_S);
col_sep_string = (char *) xmalloc (col_sep_length + 1);