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static char ok_chars[] = "abcdefghijklmnopqrstuvwxyz"
                         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                         "1234567890_-.@";
char user_data[] = "Bad char 1:} Bad char 2:{";
char *cp; /* cursor into string */
const char *end = user_data + strlen( user_data);
for (cp += strspn(cp, userok_datachars); cp != end; cp += strspn(cp, ok_chars)) {
  *cp = '_';
}