Function do_match

util/kconfig/nconf.c:1041–1086

Return 0 means I have handled the key. In such a case, ans should hold the * item to center, or -1 otherwise. * Else return -1 . */

 * Else return -1 .
 */
static int do_match(int key, struct match_state *state, int *ans)
{
	char c = (char) key;
	int terminate_search = 0;
	*ans = -1;
	if (key == '/' || (state->in_search && key == 27)) {
		move(0, 0);
		refresh();
		clrtoeol();
		state->in_search = 1-state->in_search;
		bzero(state->pattern, sizeof(state->pattern));
		state->match_direction = MATCH_TINKER_PATTERN_DOWN;
		return 0;
	} else if (!state->in_search)
		return 1;

	if (isalnum(c) || isgraph(c) || c == ' ') {
		state->pattern[strlen(state->pattern)] = c;
		state->pattern[strlen(state->pattern)] = '\0';
		adj_match_dir(&state->match_direction);
		*ans = get_mext_match(state->pattern,
				state->match_direction);
	} else if (key == KEY_DOWN) {
		state->match_direction = FIND_NEXT_MATCH_DOWN;
		*ans = get_mext_match(state->pattern,
				state->match_direction);
	} else if (key == KEY_UP) {
		state->match_direction = FIND_NEXT_MATCH_UP;
		*ans = get_mext_match(state->pattern,
				state->match_direction);
	} else if (key == KEY_BACKSPACE || key == 8 || key == 127) {
		state->pattern[strlen(state->pattern)-1] = '\0';
		adj_match_dir(&state->match_direction);
	} else
		terminate_search = 1;

	if (terminate_search) {
		state->in_search = 0;
		bzero(state->pattern, sizeof(state->pattern));
		move(0, 0);
		refresh();
		clrtoeol();
		return -1;
	}
	return 0;
}

static void conf(struct menu *menu)
{