helper interfaces: tpax_stat_compare(): initial implementation.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/helper/tpax_stat_compare.c b/src/helper/tpax_stat_compare.c
new file mode 100644
index 0000000..afbe2f4
--- /dev/null
+++ b/src/helper/tpax_stat_compare.c
@@ -0,0 +1,41 @@
+/******************************************************/
+/*  tpax: a topological pax implementation            */
+/*  Copyright (C) 2020  Z. Gilboa                     */
+/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */
+/******************************************************/
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <tpax/tpax.h>
+#include "tpax_driver_impl.h"
+
+#define TPAX_STAT_COMPARE(member)                    \
+	if (src -> member - dst -> member)            \
+		return (src -> member > dst -> member) \
+			? (1) : (-1)
+
+int tpax_stat_compare(
+	const struct stat * src,
+	const struct stat * dst)
+{
+	TPAX_STAT_COMPARE(st_dev);
+	TPAX_STAT_COMPARE(st_ino);
+
+	TPAX_STAT_COMPARE(st_mode);
+	TPAX_STAT_COMPARE(st_uid);
+	TPAX_STAT_COMPARE(st_gid);
+
+	TPAX_STAT_COMPARE(st_rdev);
+	TPAX_STAT_COMPARE(st_size);
+	TPAX_STAT_COMPARE(st_blksize);
+	TPAX_STAT_COMPARE(st_blocks);
+
+	TPAX_STAT_COMPARE(st_mtim.tv_sec);
+	TPAX_STAT_COMPARE(st_mtim.tv_nsec);
+
+	return 0;
+}