From 6adf412a256181e07b4859c3703fb4dc6023007e Mon Sep 17 00:00:00 2001
From: Hisham Muhammad <hisham@gobolinux.org>
Date: Sat, 23 Jan 2021 15:16:20 -0300
Subject: [PATCH] return higher precision times in lfs.attributes

---
 src/lfs.c      | 21 ++++++++++++++++++---
 tests/test.lua |  4 ++--
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/lfs.c b/src/lfs.c
index 95ab63b..1b74a31 100644
--- a/src/lfs.c
+++ b/src/lfs.c
@@ -876,22 +876,37 @@ static void push_st_rdev(lua_State * L, STAT_STRUCT * info)
   lua_pushinteger(L, (lua_Integer) info->st_rdev);
 }
 
+#define push_stat_timespec(field) \
+  lua_pushnumber(L, info->FIELDNAME(field).tv_sec \
+  + info->FIELDNAME(field).tv_nsec / 1000000000.0)
+
+#if _POSIX_VERSION >= 200809L
+#define FIELDNAME(field)           field
+#define push_stat_time(field)      push_stat_timespec(field)
+#elif __APPLE__
+#define FIELDNAME(field)           field ## espec
+#define push_stat_time(field)      push_stat_timespec(field)
+#else
+#define FIELDNAME(field)           field ## e
+#define push_stat_time(field)      lua_pushinteger(L, info->FIELDNAME(field))
+#endif
+
 /* time of last access */
 static void push_st_atime(lua_State * L, STAT_STRUCT * info)
 {
-  lua_pushinteger(L, (lua_Integer) info->st_atime);
+  push_stat_time(st_atim);
 }
 
 /* time of last data modification */
 static void push_st_mtime(lua_State * L, STAT_STRUCT * info)
 {
-  lua_pushinteger(L, (lua_Integer) info->st_mtime);
+  push_stat_time(st_mtim);
 }
 
 /* time of last file status change */
 static void push_st_ctime(lua_State * L, STAT_STRUCT * info)
 {
-  lua_pushinteger(L, (lua_Integer) info->st_ctime);
+  push_stat_time(st_ctim);
 }
 
 /* file size, in bytes */
diff --git a/tests/test.lua b/tests/test.lua
index ed154c0..3ace810 100644
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -151,8 +151,8 @@ io.flush()
 -- Restore access time to current value
 assert (lfs.touch (tmpfile, attrib.access, attrib.modification))
 new_att = assert (lfs.attributes (tmpfile))
-assert (new_att.access == attrib.access)
-assert (new_att.modification == attrib.modification)
+assert (new_att.access - attrib.access < 1)
+assert (new_att.modification - attrib.modification < 1)
 
 io.write(".")
 io.flush()