Fuchsia: Hello, Fuchsia!

runtime/vm/os_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "vm/os.h"
 
+#include <errno.h>
 #include <magenta/syscalls.h>
 #include <magenta/types.h>
 
 #include "platform/assert.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 #ifndef PRODUCT
 
@@ skipping 213 matching lines @@
   // Print.
   va_list print_args;
   va_copy(print_args, args);
   VSNPrint(buffer, len + 1, format, print_args);
   va_end(print_args);
   return buffer;
 }
 
 
 bool OS::StringToInt64(const char* str, int64_t* value) {
-  UNIMPLEMENTED();
-  return false;
+  ASSERT(str != NULL && strlen(str) > 0 && value != NULL);
+  int32_t base = 10;
+  char* endptr;
+  int i = 0;
+  if (str[0] == '-') {
+    i = 1;
+  }
+  if ((str[i] == '0') &&
+      (str[i + 1] == 'x' || str[i + 1] == 'X') &&
+      (str[i + 2] != '\0')) {
+    base = 16;
+  }
+  errno = 0;
+  *value = strtoll(str, &endptr, base);
+  return ((errno == 0) && (endptr != str) && (*endptr == 0));
 }
 
 
 void OS::RegisterCodeObservers() {
 #ifndef PRODUCT
   if (FLAG_generate_perf_events_symbols) {
     UNIMPLEMENTED();
   }
 #endif  // !PRODUCT
 }
@@ skipping 26 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)