* OPT_WITH_ARG()
*/
#define OPT_WITHOUT_ARG(names, cb, arg, desc) \
- (names), OPT_CB_NOARG((cb), (arg)), (desc)
+ { (names), OPT_CB_NOARG((cb), (arg)), (desc) }
/**
* OPT_WITH_ARG() - macro for initializing long and short option (with arg)
* OPT_WITHOUT_ARG()
*/
#define OPT_WITH_ARG(name, cb, show, arg, desc) \
- (name), OPT_CB_ARG((cb), (show), (arg)), (desc)
+ { (name), OPT_CB_ARG((cb), (show), (arg)), (desc) }
/**
* OPT_SUBTABLE() - macro for including another table inside a table.
* Example:
* static int verbose = 0;
* static struct opt_table opts[] = {
- * { OPT_WITHOUT_ARG("--verbose", opt_inc_intval, &verbose,
- * "Verbose mode (can be specified more than once)") },
- * { OPT_WITHOUT_ARG("-v", opt_inc_intval, &verbose,
- * "Verbose mode (can be specified more than once)") },
- * { OPT_WITHOUT_ARG("--usage", opt_usage_and_exit,
- * "args...\nA silly test program.",
- * "Print this message.") },
+ * OPT_WITHOUT_ARG("--verbose", opt_inc_intval, &verbose,
+ * "Verbose mode (can be specified more than once)"),
+ * OPT_WITHOUT_ARG("-v", opt_inc_intval, &verbose,
+ * "Verbose mode (can be specified more than once)"),
+ * OPT_WITHOUT_ARG("--usage", opt_usage_and_exit,
+ * "args...\nA silly test program.",
+ * "Print this message."),
* OPT_ENDTABLE
* };
*
* opt_parse - parse arguments.
* @argc: pointer to argc
* @argv: argv array.
- * @errlog: the function to print errors (usually opt_log_stderr).
+ * @errlog: the function to print errors
*
* This iterates through the command line and calls callbacks registered with
* opt_register_table()/opt_register_arg()/opt_register_noarg(). If there
*
* Example:
* if (!opt_parse(&argc, argv, opt_log_stderr)) {
- * printf("%s", opt_usage(argv[0], "<args>..."));
+ * printf("You screwed up, aborting!\n");
* exit(1);
* }
+ *
+ * See Also:
+ * opt_log_stderr, opt_log_stderr_exit
*/
bool opt_parse(int *argc, char *argv[], void (*errlog)(const char *fmt, ...));
* opt_log_stderr - print message to stderr.
* @fmt: printf-style format.
*
- * This is the standard helper for opt_parse, to print errors.
+ * This is a helper for opt_parse, to print errors to stderr.
+ *
+ * See Also:
+ * opt_log_stderr_exit
*/
void opt_log_stderr(const char *fmt, ...);
+/**
+ * opt_log_stderr_exit - print message to stderr, then exit(1)
+ * @fmt: printf-style format.
+ *
+ * Just like opt_log_stderr, only then does exit(1). This means that
+ * when handed to opt_parse, opt_parse will never return false.
+ *
+ * Example:
+ * // This never returns false; just exits if there's an erorr.
+ * opt_parse(&argc, argv, opt_log_stderr_exit);
+ */
+void opt_log_stderr_exit(const char *fmt, ...);
+
/**
* opt_invalid_argument - helper to allocate an "Invalid argument '%s'" string
* @arg: the argument which was invalid.
* and a table of all the options with their descriptions. If an option has
* description opt_hidden, it is not shown here.
*
+ * If "extra" is NULL, then the extra information is taken from any
+ * registered option which calls opt_usage_and_exit(). This avoids duplicating
+ * that string in the common case.
+ *
* The result should be passed to free().
*/
char *opt_usage(const char *argv0, const char *extra);