X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fopt%2Fusage.c;h=26150ea8cd409e6c84d5a33067fd15932bccb4dc;hb=d07f742c5925b97ed558eb07aae285616f5df823;hp=b71fb334627f174fbc8bfd2022e87c0304d43fd8;hpb=79715b8c08446fe5e74d2ab9e9db00175169eab3;p=ccan

diff --git a/ccan/opt/usage.c b/ccan/opt/usage.c
index b71fb334..26150ea8 100644
--- a/ccan/opt/usage.c
+++ b/ccan/opt/usage.c
@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <stdarg.h>
 #include "private.h"
 
 /* We only use this for pointer comparisons. */
@@ -227,3 +228,17 @@ char *opt_usage(const char *argv0, const char *extra)
 	ret[len] = '\0';
 	return ret;
 }
+
+void opt_usage_exit_fail(const char *msg, ...)
+{
+	va_list ap;
+
+	if (opt_argv0)
+		fprintf(stderr, "%s: ", opt_argv0);
+	va_start(ap, msg);
+	vfprintf(stderr, msg, ap);
+	va_end(ap);
+	fprintf(stderr, "\n%s",
+		opt_usage(opt_argv0 ? opt_argv0 : "<program>", NULL));
+	exit(1);
+}