dump initial timestamp "t0"

test/basic.js

@@ -85,6 +85,7 @@ b0000000000001111 {u
       date: ' Wed Sep 18 22:59:07 2019\n ',
       version: ' Generated by VerilatedVcd ',
       timescale: '   1ns ',
+      t0: 1,
       varId: 'u)',
       wires: {
         top: {

test/wasm_basic.js

@@ -83,6 +83,7 @@ b0000000000001111 {u
       date: ' Wed Sep 18 22:59:07 2019\n ',
       version: ' Generated by VerilatedVcd ',
       timescale: '   1ns ',
+      t0: 1,
       varId: 'u)',
       wires: {
         top: {

vcd.c

@@ -1,5 +1,6 @@
 #define NAPI_VERSION 1
 #include <stdio.h>
+#include <limits.h>
 #include <stdlib.h>
 #include "vcd_parser.h"
 #include <node_api.h>
@@ -135,6 +136,7 @@ METHOD(init) {
   state->tmpStr2 = tmpStr2;
   state->value = valueBuf;
   state->mask = maskBuf;
+  state->time = UINT64_MAX;
   state->digitCount = 0;
 
   napi_value status;

vcd_spans.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 #include "vcd_parser.h"
 
 #ifndef VCDWASM
@@ -261,6 +262,17 @@ int onDigit(
 }
 
 int timeSpan(vcd_parser_t* state, const unsigned char* p, const unsigned char* endp) {
-  state->time = strtoul((const char *)p, (char **)&endp, 10);
+  int64_t time = strtoul((const char *)p, (char **)&endp, 10);
+  if (state->time == UINT64_MAX) {
+#ifndef VCDWASM
+    napi_env env = state->napi_env;
+    napi_value val;
+    ASSERT(val, napi_create_int32(env, time, &val))
+    ASSERT(state->info, napi_set_named_property(env, state->info, "t0", val))
+#else
+    set_property_int("t0", time);
+#endif
+  }
+  state->time = time;
   return 0;
 }

wasm_main.cpp

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 #include <iostream>
 #include "vcd_parser.h"
 
@@ -119,6 +120,7 @@ int init(
   state->value = valueBuf;
   state->mask = maskBuf;
   state->digitCount = 0;
+  state->time = UINT64_MAX;
 
   set_property_string("status", "declaration");