gecko-dev/xpcom/build/BinaryPath.h

166 lines
4.3 KiB
C++

/* 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))
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 *argv0, 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(argv0, '/') && realpath(argv0, 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, argv0);
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;
}
#elif defined(XP_OS2)
static nsresult Get(const char *argv0, char aResult[MAXPATHLEN])
{
PPIB ppib;
PTIB ptib;
DosGetInfoBlocks( &ptib, &ppib);
DosQueryModuleName(ppib->pib_hmte, MAXPATHLEN, aResult);
}
#else
#error Oops, you need platform-specific code here
#endif
public:
static nsresult GetFile(const char *argv0, nsIFile* *aResult)
{
nsCOMPtr<nsIFile> lf;
#ifdef XP_WIN
wchar_t exePath[MAXPATHLEN];
nsresult rv = GetW(argv0, exePath);
#else
char exePath[MAXPATHLEN];
nsresult rv = Get(argv0, 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;
}
};
}
#endif /* mozilla_BinaryPath_h */