+/*
+ * Check for user-capabilities that happen to be used in ncurses' terminal
+ * database.
+ */
+#if NCURSES_XNAMES
+static struct user_table_entry const *
+lookup_user_capability(const char *name)
+{
+ struct user_table_entry const *result = 0;
+ if (*name != 'k') {
+ result = _nc_find_user_entry(name);
+ }
+ return result;
+}
+#endif
+
+/*
+ * If a given name is likely to be a user-capability, return the number of
+ * parameters it would be used with. If not, return -1.
+ *
+ * ncurses assumes that u6 could be used for getting the cursor-position, but
+ * that is not implemented. Make a special case for that, to quiet needless
+ * warnings.
+ *
+ * The other string-capability extensions (see terminfo.src) which could have
+ * parameters such as "Ss", "%u", are not used by ncurses. But we check those
+ * anyway, to validate the terminfo database.
+ */
+static int
+is_user_capability(const char *name)
+{
+ int result = -1;
+ if (name[0] == 'u' &&
+ (name[1] >= '0' && name[1] <= '9') &&
+ name[2] == '\0') {
+ result = (name[1] == '6') ? 2 : 0;
+ }
+#if NCURSES_XNAMES
+ else if (using_extensions) {
+ struct user_table_entry const *p = lookup_user_capability(name);
+ if (p != 0) {
+ result = (int) p->ute_argc;
+ }
+ }
+#endif
+ return result;
+}
+
+static bool
+line_capability(const char *name)
+{
+ bool result = FALSE;
+ static const char *table[] =
+ {
+ "csr", /* change_scroll_region */
+ "clear", /* clear_screen */
+ "ed", /* clr_eos */
+ "cwin", /* create_window */
+ "cup", /* cursor_address */
+ "cud1", /* cursor_down */
+ "home", /* cursor_home */
+ "mrcup", /* cursor_mem_address */
+ "ll", /* cursor_to_ll */
+ "cuu1", /* cursor_up */
+ "dl1", /* delete_line */
+ "hd", /* down_half_line */
+ "flash", /* flash_screen */
+ "ff", /* form_feed */
+ "il1", /* insert_line */
+ "nel", /* newline */
+ "dl", /* parm_delete_line */
+ "cud", /* parm_down_cursor */
+ "indn", /* parm_index */
+ "il", /* parm_insert_line */
+ "rin", /* parm_rindex */
+ "cuu", /* parm_up_cursor */
+ "mc0", /* print_screen */
+ "vpa", /* row_address */
+ "ind", /* scroll_forward */
+ "ri", /* scroll_reverse */
+ "hu", /* up_half_line */
+ };
+ size_t n;
+ for (n = 0; n < SIZEOF(table); ++n) {
+ if (!strcmp(name, table[n])) {
+ result = TRUE;
+ break;
+ }
+ }
+ return result;
+}
+