+/* Parse ARG, an option to a boolean variable.
+ Returns 1 for true, 0 for false, and -1 if invalid. */
+extern int parse_cli_boolean_value (const char *arg);
+
+/* Same as above, but work with a pointer to pointer. ARG is advanced
+ past a successfully parsed value. */
+extern int parse_cli_boolean_value (const char **arg);
+
+/* Parse ARG, an option to a var_uinteger or var_zuinteger variable.
+ Either returns the parsed value on success or throws an error. If
+ EXPRESSION is true, *ARG is parsed as an expression; otherwise, it
+ is parsed with get_ulongest. It's not possible to parse the
+ integer as an expression when there may be valid input after the
+ integer, such as when parsing command options. E.g., "print
+ -elements NUMBER -obj --". In such case, parsing as an expression
+ would parse "-obj --" as part of the expression as well. */
+extern unsigned int parse_cli_var_uinteger (var_types var_type,
+ const char **arg,
+ bool expression);
+
+/* Like parse_cli_var_uinteger, for var_zuinteger_unlimited. */
+extern int parse_cli_var_zuinteger_unlimited (const char **arg,
+ bool expression);
+
+/* Parse ARG, an option to a var_enum variable. ENUM is a
+ null-terminated array of possible values. Either returns the parsed
+ value on success or throws an error. ARG is advanced past the
+ parsed value. */
+const char *parse_cli_var_enum (const char **args,
+ const char *const *enums);