X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fopt%2Fopt.h;h=690907e595eff6922690204eb4c76a6be3e59d8c;hb=3e1be50f117fee7d3bc6c4a56e71c15495f3bcad;hp=727dacd0f148594a87c1b465c8180438b778a349;hpb=63b0055673d2c55ff90f8b7bd8a7c5fe30f83269;p=ccan

diff --git a/ccan/opt/opt.h b/ccan/opt/opt.h
index 727dacd0..690907e5 100644
--- a/ccan/opt/opt.h
+++ b/ccan/opt/opt.h
@@ -372,6 +372,22 @@ char *opt_invalid_argument(const char *arg);
  */
 char *opt_usage(const char *argv0, const char *extra);
 
+/**
+ * opt_usage_exit_fail - complain about bad usage to stderr, exit with status 1.
+ * @msg...: printf-style message to output.
+ *
+ * This prints argv[0] (if opt_parse has been called), a colon, then
+ * the message to stderr (just like errx()).  Then it prints out the
+ * usage message, taken from any registered option which uses
+ * opt_usage_and_exit() as described in opt_usage(argv0, NULL) above.
+ * Then it exits with status 1.
+ *
+ * Example:
+ *	if (argc != 5)
+ *		opt_usage_exit_fail("Need 5 arguments, only got %u", argc);
+ */
+void opt_usage_exit_fail(const char *msg, ...) NORETURN;
+
 /**
  * opt_hidden - string for undocumented options.
  *