smok@google.com
ebbc2020a2
Review URL: https://codereview.chromium.org//14341015 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@22032 260f80e4-7a28-3924-810f-c04153c831b5
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "bin/extensions.h"
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#include <stdio.h>
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#include "include/dart_api.h"
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#include "platform/assert.h"
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#include "platform/globals.h"
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#include "bin/dartutils.h"
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#include "bin/file.h"
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namespace dart {
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namespace bin {
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Dart_Handle Extensions::LoadExtension(const char* extension_url,
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Dart_Handle parent_library) {
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char* library_path = strdup(extension_url);
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if (library_path == NULL) {
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return Dart_Error("Out of memory in LoadExtension");
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}
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// Extract the path and the extension name from the url.
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char* last_path_separator = strrchr(library_path, '/');
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char* extension_name = last_path_separator + 1;
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*last_path_separator = '\0'; // Terminate library_path at last separator.
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void* library_handle = LoadExtensionLibrary(library_path, extension_name);
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if (library_handle == NULL) {
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free(library_path);
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return Dart_Error("cannot find extension library");
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}
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const char* strings[] = { extension_name, "_Init", NULL };
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char* init_function_name = Concatenate(strings);
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typedef Dart_Handle (*InitFunctionType)(Dart_Handle import_map);
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InitFunctionType fn = reinterpret_cast<InitFunctionType>(
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ResolveSymbol(library_handle, init_function_name));
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free(init_function_name);
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free(library_path);
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if (fn == NULL) {
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return Dart_Error("cannot find initialization function in extension");
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}
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return (*fn)(parent_library);
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}
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// Concatenates a NULL terminated array of strings.
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// The returned string must be freed.
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char* Extensions::Concatenate(const char** strings) {
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int size = 1; // null termination.
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for (int i = 0; strings[i] != NULL; i++) {
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size += strlen(strings[i]);
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}
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char* result = reinterpret_cast<char*>(malloc(size));
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int index = 0;
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for (int i = 0; strings[i] != NULL; i++) {
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index += snprintf(result + index, size - index, "%s", strings[i]);
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}
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ASSERT(index == size - 1);
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ASSERT(result[size - 1] == '\0');
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return result;
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}
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} // namespace bin
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} // namespace dart
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