unix: Add basic time module (with time() and clock() functions).

Both return int so far (single-precision float doesn't have enough
bits to represent int32 precisely).

unix/Makefile

@@ -14,6 +14,10 @@ include ../py/py.mk
 CFLAGS = -I. -I$(PY_SRC) -Wall -Werror -ansi -std=gnu99 -DUNIX $(CFLAGS_MOD)
 LDFLAGS = $(LDFLAGS_MOD) -lm
 
+ifeq ($(MICROPY_MOD_TIME),1)
+CFLAGS_MOD += -DMICROPY_MOD_TIME=1
+SRC_MOD += time.c
+endif
 ifeq ($(MICROPY_MOD_FFI),1)
 CFLAGS_MOD += `pkg-config --cflags libffi` -DMICROPY_MOD_FFI=1
 LDFLAGS_MOD += -ldl -lffi

unix/main.c

@@ -24,6 +24,7 @@
 extern const mp_obj_fun_native_t mp_builtin_open_obj;
 void file_init();
 void rawsocket_init();
+void time_init();
 void ffi_init();
 
 static void execute_from_lexer(mp_lexer_t *lex, mp_parse_input_kind_t input_kind, bool is_repl) {
@@ -242,6 +243,9 @@ int main(int argc, char **argv) {
 
     file_init();
     rawsocket_init();
+#if MICROPY_MOD_TIME
+    time_init();
+#endif
 #if MICROPY_MOD_FFI
     ffi_init();
 #endif

unix/mpconfigport.mk

 # Enable/disable modules to be included in interpreter
 
+# Subset of CPython time module
+MICROPY_MOD_TIME = 1
+
 # ffi module requires libffi (libffi-dev Debian package)
 MICROPY_MOD_FFI = 0

unix/time.c

+#include <string.h>
+#include <time.h>
+
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "runtime.h"
+
+static mp_obj_t mod_time_time() {
+    return mp_obj_new_int((machine_int_t)time(NULL));
+}
+static MP_DEFINE_CONST_FUN_OBJ_0(mod_time_time_obj, mod_time_time);
+
+// Note: this is deprecated since CPy3.3, but pystone still uses it.
+static mp_obj_t mod_time_clock() {
+    return mp_obj_new_int((machine_int_t)clock());
+}
+static MP_DEFINE_CONST_FUN_OBJ_0(mod_time_clock_obj, mod_time_clock);
+
+void time_init() {
+    mp_obj_t m = mp_obj_new_module(QSTR_FROM_STR_STATIC("time"));
+    rt_store_attr(m, QSTR_FROM_STR_STATIC("time"), (mp_obj_t)&mod_time_time_obj);
+    rt_store_attr(m, QSTR_FROM_STR_STATIC("clock"), (mp_obj_t)&mod_time_clock_obj);
+}