cal: add test code

This patch allows to override the time() and define a different time by
TEST_TIME env. variable.  The code has to be compiled with -DTEST_CAL.

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/misc-utils/cal.c b/misc-utils/cal.c
index dc5848aa..f5ede93d 100644
--- a/misc-utils/cal.c
+++ b/misc-utils/cal.c
@@ -351,7 +351,16 @@ main(int argc, char **argv) {
 			errx(1, _("illegal year value: use 1-9999"));
 		break;
 	case 0:
-		time(&now);
+	{
+#ifdef TEST_CAL
+		char *e = getenv("TEST_TIME");
+
+		if (e && isdigit((unsigned char) *e))
+			now = atol(e);
+		else
+#endif
+			time(&now);
+	}
 		local_time = localtime(&now);
 		if (isatty(1))
 			day = local_time->tm_yday + 1;