Method open

Engine/source/platformPOSIX/POSIXFileio.cpp:486–573

----------------------------------------------------------------------------- Open a file in the mode specified by openMode (Read, Write, or ReadWrite). Truncate the file if the mode is either Write or ReadWrite and truncate is true. Sets capability appropriate to the openMode. Returns the currentStatus of the file. -----------------------------------------------------------------------------

// Returns the currentStatus of the file.
//-----------------------------------------------------------------------------
File::FileStatus File::open(const char *filename, const AccessMode openMode)
{
    AssertFatal(NULL != filename, "File::open: NULL filename");
    AssertWarn(NULL == handle, "File::open: handle already valid");

    // Close the file if it was already open...
    if (Closed != currentStatus)
        close();

    char prefPathName[MaxPath];
    char gamePathName[MaxPath];
    char cwd[MaxPath];
    getcwd(cwd, MaxPath);
    MungePath(prefPathName, MaxPath, filename, GetPrefDir());
    MungePath(gamePathName, MaxPath, filename, cwd);

    int oflag;
    struct stat filestat;
    handle = (void *)dRealMalloc(sizeof(int));

    switch (openMode)
    {
        case Read:
            oflag = O_RDONLY;
            break;
        case Write:
            oflag = O_WRONLY | O_CREAT | O_TRUNC;
            break;
        case ReadWrite:
            oflag = O_RDWR | O_CREAT;
            // if the file does not exist copy it before reading/writing
            if (stat(prefPathName, &filestat) == -1)
                bool ret = CopyFile(gamePathName, prefPathName);
            break;
        case WriteAppend:
            oflag = O_WRONLY | O_CREAT | O_APPEND;
            // if the file does not exist copy it before appending
            if (stat(prefPathName, &filestat) == -1)
                bool ret = CopyFile(gamePathName, prefPathName);
            break;
        default:
            AssertFatal(false, "File::open: bad access mode");    // impossible
    }

    // if we are writing, make sure output path exists
    if (openMode == Write || openMode == ReadWrite || openMode == WriteAppend)
        Platform::createPath(prefPathName);

    int fd = -1;
    fd = x86UNIXOpen(prefPathName, oflag);
    if (fd == -1 && openMode == Read)
        // for read only files we can use the gamePathName
        fd = x86UNIXOpen(gamePathName, oflag);

    dMemcpy(handle, &fd, sizeof(int));

#ifdef DEBUG
    //   fprintf(stdout,"fd = %d, handle = %d\n", fd, *((int *)handle));