xpcom/build/BinaryPath.h
author Wes Kocher <wkocher@mozilla.com>
Wed, 20 Jul 2016 15:40:33 -0700
changeset 348052 d2c17679b215bb340b1b8051c74526f6301c6253
parent 285938 91d6e262b662a0b4e47358665e222d3927337af9
child 377758 8c3f028204919bc85aa873a224adbd5686c104ac
permissions -rw-r--r--
Backed out 5 changesets (bug 1287623) for static build bustage CLOSED TREE Backed out changeset a48daec87ec9 (bug 1287623) Backed out changeset 248153344e15 (bug 1287623) Backed out changeset 8aa409c9b1ce (bug 1287623) Backed out changeset 602d4d88e806 (bug 1287623) Backed out changeset 114da8bdc0b0 (bug 1287623)

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_BinaryPath_h
#define mozilla_BinaryPath_h

#include "nsXPCOMPrivate.h" // for MAXPATHLEN
#ifdef XP_WIN
#include <windows.h>
#elif defined(XP_MACOSX)
#include <CoreFoundation/CoreFoundation.h>
#elif defined(XP_UNIX)
#include <sys/stat.h>
#include <string.h>
#endif

namespace mozilla {

class BinaryPath
{
public:
#ifdef XP_WIN
  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
  {
    wchar_t wide_path[MAXPATHLEN];
    nsresult rv = GetW(argv0, wide_path);
    if (NS_FAILED(rv)) {
      return rv;
    }
    WideCharToMultiByte(CP_UTF8, 0, wide_path, -1,
                        aResult, MAXPATHLEN, nullptr, nullptr);
    return NS_OK;
  }

private:
  static nsresult GetW(const char* argv0, wchar_t aResult[MAXPATHLEN])
  {
    if (::GetModuleFileNameW(0, aResult, MAXPATHLEN)) {
      return NS_OK;
    }
    return NS_ERROR_FAILURE;
  }

#elif defined(XP_MACOSX)
  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
  {
    // Works even if we're not bundled.
    CFBundleRef appBundle = CFBundleGetMainBundle();
    if (!appBundle) {
      return NS_ERROR_FAILURE;
    }

    CFURLRef executableURL = CFBundleCopyExecutableURL(appBundle);
    if (!executableURL) {
      return NS_ERROR_FAILURE;
    }

    nsresult rv;
    if (CFURLGetFileSystemRepresentation(executableURL, false, (UInt8*)aResult,
                                         MAXPATHLEN)) {
      // Sanitize path in case the app was launched from Terminal via
      // './firefox' for example.
      size_t readPos = 0;
      size_t writePos = 0;
      while (aResult[readPos] != '\0') {
        if (aResult[readPos] == '.' && aResult[readPos + 1] == '/') {
          readPos += 2;
        } else {
          aResult[writePos] = aResult[readPos];
          readPos++;
          writePos++;
        }
      }
      aResult[writePos] = '\0';
      rv = NS_OK;
    } else {
      rv = NS_ERROR_FAILURE;
    }

    CFRelease(executableURL);
    return rv;
  }

#elif defined(ANDROID)
  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
  {
    // On Android, we use the GRE_HOME variable that is set by the Java
    // bootstrap code.
    const char* greHome = getenv("GRE_HOME");
#if defined(MOZ_WIDGET_GONK)
    if (!greHome) {
      greHome = "/system/b2g";
    }
#endif

    if (!greHome) {
      return NS_ERROR_FAILURE;
    }

    snprintf(aResult, MAXPATHLEN, "%s/%s", greHome, "dummy");
    aResult[MAXPATHLEN - 1] = '\0';
    return NS_OK;
  }

#elif defined(XP_UNIX)
  static nsresult Get(const char* aArgv0, char aResult[MAXPATHLEN])
  {
    struct stat fileStat;
    // on unix, there is no official way to get the path of the current binary.
    // instead of using the MOZILLA_FIVE_HOME hack, which doesn't scale to
    // multiple applications, we will try a series of techniques:
    //
    // 1) use realpath() on argv[0], which works unless we're loaded from the
    //    PATH. Only do so if argv[0] looks like a path (contains a /).
    // 2) manually walk through the PATH and look for ourself
    // 3) give up
    if (strchr(aArgv0, '/') && realpath(aArgv0, aResult) &&
        stat(aResult, &fileStat) == 0) {
      return NS_OK;
    }

    const char* path = getenv("PATH");
    if (!path) {
      return NS_ERROR_FAILURE;
    }

    char* pathdup = strdup(path);
    if (!pathdup) {
      return NS_ERROR_OUT_OF_MEMORY;
    }

    bool found = false;
    char* token = strtok(pathdup, ":");
    while (token) {
      char tmpPath[MAXPATHLEN];
      sprintf(tmpPath, "%s/%s", token, aArgv0);
      if (realpath(tmpPath, aResult) && stat(aResult, &fileStat) == 0) {
        found = true;
        break;
      }
      token = strtok(nullptr, ":");
    }
    free(pathdup);
    if (found) {
      return NS_OK;
    }
    return NS_ERROR_FAILURE;
  }

#else
#error Oops, you need platform-specific code here
#endif

public:
  static nsresult GetFile(const char* aArgv0, nsIFile** aResult)
  {
    nsCOMPtr<nsIFile> lf;
#ifdef XP_WIN
    wchar_t exePath[MAXPATHLEN];
    nsresult rv = GetW(aArgv0, exePath);
#else
    char exePath[MAXPATHLEN];
    nsresult rv = Get(aArgv0, exePath);
#endif
    if (NS_FAILED(rv)) {
      return rv;
    }
#ifdef XP_WIN
    rv = NS_NewLocalFile(nsDependentString(exePath), true,
                         getter_AddRefs(lf));
#else
    rv = NS_NewNativeLocalFile(nsDependentCString(exePath), true,
                               getter_AddRefs(lf));
#endif
    if (NS_FAILED(rv)) {
      return rv;
    }
    NS_ADDREF(*aResult = lf);
    return NS_OK;
  }
};

} // namespace mozilla

#endif /* mozilla_BinaryPath_h */