1 files changed, 47 insertions, 0 deletions
diff --git a/lib/gettime.c b/lib/gettime.c
new file mode 100644
index 0000000..c61c88c
--- /dev/null
+++ b/lib/gettime.c
@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: 2017, Chris Lamb
+// SPDX-FileCopyrightText: 2023-2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include "atoi/a2i.h"
+#include "defines.h"
+#include "prototypes.h"
+#include "shadowlog.h"
+
+
+/*
+ * gettime() returns the time as the number of seconds since the Epoch
+ *
+ * Like time(), gettime() returns the time as the number of seconds since the
+ * Epoch, 1970-01-01 00:00:00 +0000 (UTC), except that if the SOURCE_DATE_EPOCH
+ * environment variable is exported it will use that instead.
+ */
+/*@observer@*/time_t
+gettime(void)
+{
+	char    *source_date_epoch;
+	FILE    *shadow_logfd = log_get_logfd();
+	time_t  fallback, epoch;
+
+	fallback = time (NULL);
+	source_date_epoch = shadow_getenv ("SOURCE_DATE_EPOCH");
+
+	if (!source_date_epoch)
+		return fallback;
+
+	if (a2i(time_t, &epoch, source_date_epoch, NULL, 10, 0, fallback) == -1) {
+		fprintf(shadow_logfd,
+		        _("Environment variable $SOURCE_DATE_EPOCH: a2i(\"%s\"): %s"),
+		        source_date_epoch, strerror(errno));
+		return fallback;
+	}
+	return epoch;
+}