/* create caller id from digits by comparing with national and international
* prefixes.
*/
-char *nationalize_callerinfo(char *string, int *ntype, char *national, char *international)
+const char *nationalize_callerinfo(const char *string, int *ntype, const char *national, const char *international)
{
if (!strncmp(international, string, strlen(international)))
{
/* create number (including access codes) from caller id
* prefixes.
*/
-char *numberrize_callerinfo(char *string, int ntype, char *national, char *international)
+const char *numberrize_callerinfo(const char *string, int ntype, const char *national, const char *international)
{
static char result[256];