Test for --nacl-gdb functionality.

chrome/browser/nacl_host/test/mock_nacl_gdb.cc

Index: chrome/browser/nacl_host/test/mock_nacl_gdb.cc
===================================================================
--- chrome/browser/nacl_host/test/mock_nacl_gdb.cc	(revision 0)
+++ chrome/browser/nacl_host/test/mock_nacl_gdb.cc	(working copy)
@@ -0,0 +1,64 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <cstdio>
+#include <cstring>
+
+#include "base/command_line.h"
+#include "base/environment.h"
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/process_util.h"
+
+static const char kArgs[] = "--args";
+static const char kEvalCommand[] = "--eval-command";
+static const char kNaClIrt[] = "nacl-irt ";
+static const char kPass[] = "PASS";
+
+int main(int argc, char** argv) {
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+  std::string mock_nacl_gdb_file;
+  env->GetVar("MOCK_NACL_GDB", &mock_nacl_gdb_file);
+  file_util::WriteFile(FilePath::FromUTF8Unsafe(mock_nacl_gdb_file),
+                       kPass, strlen(kPass));
+  CHECK_GE(argc, 3);
+  // First argument should be --eval-command.
+  CHECK_EQ(strcmp(argv[1], kEvalCommand), 0);
+  // Second argument should start with nacl-irt.
+  CHECK_GE(strlen(argv[2]), strlen(kNaClIrt));
+  CHECK_EQ(strncmp(argv[2], kNaClIrt, strlen(kNaClIrt)), 0);
+  char* irt_file_name = &argv[2][strlen(kNaClIrt)];
+  FILE* irt_file = fopen(irt_file_name, "r");
+  // nacl-irt parameter must be a file name.
+  PCHECK(irt_file);
+  fclose(irt_file);
+  int i = 3;
+  // Skip additional --eval-command parameters.
+  while (i < argc) {
+    if (strcmp(argv[i], kArgs) == 0) {
+      i++;
+      break;
+    }
+    if (strcmp(argv[i], kEvalCommand) == 0) {
+      i += 2;
+      // Command line shouldn't end with --eval-command switch without value.
+      CHECK_LE(i, argc);
+      continue;
+    }
+    // Unknown argument.
+    NOTREACHED() << "Invalid argument " << argv[i];
+  }
+  // --args switch must be present.
+  CHECK_LT(i, argc);
+
+  CommandLine::StringVector arguments;
+  for (; i < argc; i++) {
+    arguments.push_back(
+        CommandLine::StringType(argv[i], argv[i] + strlen(argv[i])));
+  }
+  CommandLine cmd_line(arguments);
+  // Process must be launched successfully.
+  PCHECK(base::LaunchProcess(cmd_line, base::LaunchOptions(), NULL));
+  return 0;
+}