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-rw-r--r--wcal.c12
1 files changed, 11 insertions, 1 deletions
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);