From f0628f5499774817ccbf34e66b22c56ec8e68a90 Mon Sep 17 00:00:00 2001
From: Nick Moore <nick@zoic.org>
Date: Thu, 19 Oct 2017 11:01:53 +1100
Subject: [PATCH] esp32/modutime.c: Add localtime and mktime functions.

---
 ports/esp32/modutime.c | 45 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/ports/esp32/modutime.c b/ports/esp32/modutime.c
index f037faad9..002854298 100644
--- a/ports/esp32/modutime.c
+++ b/ports/esp32/modutime.c
@@ -30,8 +30,51 @@
 #include <string.h>
 #include <sys/time.h>
 
+#include "py/runtime.h"
+#include "lib/timeutils/timeutils.h"
 #include "extmod/utime_mphal.h"
 
+STATIC mp_obj_t time_localtime(size_t n_args, const mp_obj_t *args) {
+    timeutils_struct_time_t tm;
+    mp_int_t seconds;
+    if (n_args == 0 || args[0] == mp_const_none) {
+        struct timeval tv;
+        gettimeofday(&tv, NULL);
+        seconds = tv.tv_sec;
+    } else {
+        seconds = mp_obj_get_int(args[0]);
+    }
+    timeutils_seconds_since_2000_to_struct_time(seconds, &tm);
+    mp_obj_t tuple[8] = {
+        tuple[0] = mp_obj_new_int(tm.tm_year),
+        tuple[1] = mp_obj_new_int(tm.tm_mon),
+        tuple[2] = mp_obj_new_int(tm.tm_mday),
+        tuple[3] = mp_obj_new_int(tm.tm_hour),
+        tuple[4] = mp_obj_new_int(tm.tm_min),
+        tuple[5] = mp_obj_new_int(tm.tm_sec),
+        tuple[6] = mp_obj_new_int(tm.tm_wday),
+        tuple[7] = mp_obj_new_int(tm.tm_yday),
+    };
+    return mp_obj_new_tuple(8, tuple);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(time_localtime_obj, 0, 1, time_localtime);
+
+STATIC mp_obj_t time_mktime(mp_obj_t tuple) {
+    size_t len;
+    mp_obj_t *elem;
+    mp_obj_get_array(tuple, &len, &elem);
+
+    // localtime generates a tuple of len 8. CPython uses 9, so we accept both.
+    if (len < 8 || len > 9) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "mktime needs a tuple of length 8 or 9 (%d given)", len));
+    }
+
+    return mp_obj_new_int_from_uint(timeutils_mktime(mp_obj_get_int(elem[0]),
+            mp_obj_get_int(elem[1]), mp_obj_get_int(elem[2]), mp_obj_get_int(elem[3]),
+            mp_obj_get_int(elem[4]), mp_obj_get_int(elem[5])));
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(time_mktime_obj, time_mktime);
+
 STATIC mp_obj_t time_time(void) {
     struct timeval tv;
     gettimeofday(&tv, NULL);
@@ -42,6 +85,8 @@ MP_DEFINE_CONST_FUN_OBJ_0(time_time_obj, time_time);
 STATIC const mp_rom_map_elem_t time_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_utime) },
 
+    { MP_ROM_QSTR(MP_QSTR_localtime), MP_ROM_PTR(&time_localtime_obj) },
+    { MP_ROM_QSTR(MP_QSTR_mktime), MP_ROM_PTR(&time_mktime_obj) },
     { MP_ROM_QSTR(MP_QSTR_time), MP_ROM_PTR(&time_time_obj) },
     { MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&mp_utime_sleep_obj) },
     { MP_ROM_QSTR(MP_QSTR_sleep_ms), MP_ROM_PTR(&mp_utime_sleep_ms_obj) },