From 6dc570e657d6cac10aa2af9c259df6c2cdb4ae02 Mon Sep 17 00:00:00 2001
From: Leah Neukirchen <leah@vuxu.org>
Date: Sun, 13 Feb 2022 18:23:41 +0100
Subject: add usage, wcal takes no arguments

---
 wcal.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'wcal.c')

diff --git a/wcal.c b/wcal.c
index fefc9e3..3293f42 100644
--- a/wcal.c
+++ b/wcal.c
@@ -109,6 +109,13 @@ parse_isodate(char *optarg, int *y, int *m, int *d)
 	}
 }
 
+void
+usage()
+{
+	fprintf(stderr, "Usage: wcal [-13yci] [-d YYYY[-MM[-DD]]]\n");
+	exit(1);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -135,9 +142,12 @@ main(int argc, char *argv[])
 		case 'y': flagy = 1; break;
 		case 'i': flagi = 1; break;
 		case 'd': parse_isodate(optarg, &y, &m, &d); break;
-		case '?': exit(1);
+		case '?': usage();
 		}
 
+	if (argc > optind)
+		usage();
+
 	long today = ymd2jd(y, m, d);
 	jd2ymdwi(today, &y, &m, &d, &cw, &ci, &cg);
 
-- 
cgit 1.4.1