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-rw-r--r--lib/util/source_date_epoch.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/util/source_date_epoch.c b/lib/util/source_date_epoch.c
new file mode 100644
index 0000000..1397e52
--- /dev/null
+++ b/lib/util/source_date_epoch.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * source_date_epoch.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+uint32_t get_source_date_epoch(void)
+{
+ const char *str, *ptr;
+ uint32_t x, tval = 0;
+
+ str = getenv("SOURCE_DATE_EPOCH");
+
+ if (str == NULL || *str == '\0')
+ return 0;
+
+ for (ptr = str; *ptr != '\0'; ++ptr) {
+ if (!isdigit(*ptr))
+ goto fail_nan;
+
+ x = (*ptr) - '0';
+
+ if (tval > (UINT32_MAX - x) / 10)
+ goto fail_ov;
+
+ tval = tval * 10 + x;
+ }
+
+ return tval;
+fail_ov:
+ fprintf(stderr, "WARNING: SOURCE_DATE_EPOCH=%s does not fit into "
+ "32 bit integer\n", str);
+ return 0;
+fail_nan:
+ fprintf(stderr, "WARNING: SOURCE_DATE_EPOCH=%s is not a positive "
+ "number\n", str);
+ return 0;
+}