Esempi in C++ (Cpp) per dircache_get_entry_ptr

Esempio n. 1

/* Test file existence, using dircache of possible */
bool file_exists(const char *file)
{
    int fd;

#ifdef DEBUG
    if (!file || !*file)
    {
        DEBUGF("%s(%p): Invalid parameter!\n", __func__, file);
        return false;
    }
#endif

#ifdef HAVE_DIRCACHE
    if (dircache_is_enabled())
        return (dircache_get_entry_ptr(file) != NULL);
#endif

    fd = open(file, O_RDONLY);
    if (fd < 0)
        return false;
    close(fd);
    return true;
}

Esempio n. 2

File: file.c Progetto: eisnerd/rockbox

static int open_internal(const char* pathname, int flags, bool use_cache)
{
    DIR_UNCACHED* dir;
    struct dirent_uncached* entry;
    int fd;
    char pathnamecopy[MAX_PATH];
    char* name;
    struct filedesc* file = NULL;
    int rc;
#ifndef HAVE_DIRCACHE
    (void)use_cache;
#endif

    LDEBUGF("open(\"%s\",%d)\n",pathname,flags);

    if ( pathname[0] != '/' ) {
        DEBUGF("'%s' is not an absolute path.\n",pathname);
        DEBUGF("Only absolute pathnames supported at the moment\n");
        errno = EINVAL;
        return -1;
    }

    /* find a free file descriptor */
    for ( fd=0; fd<MAX_OPEN_FILES; fd++ )
        if ( !openfiles[fd].busy )
            break;

    if ( fd == MAX_OPEN_FILES ) {
        DEBUGF("Too many files open\n");
        errno = EMFILE;
        return -2;
    }

    file = &openfiles[fd];
    memset(file, 0, sizeof(struct filedesc));

    if (flags & (O_RDWR | O_WRONLY)) {
        file->write = true;

        if (flags & O_TRUNC)
            file->trunc = true;
    }
    file->busy = true;

#ifdef HAVE_DIRCACHE
    if (dircache_is_enabled() && !file->write && use_cache)
    {
        const struct dircache_entry *ce;
# ifdef HAVE_MULTIVOLUME
        int volume = strip_volume(pathname, pathnamecopy);
# endif

        ce = dircache_get_entry_ptr(pathname);
        if (!ce)
        {
            errno = ENOENT;
            file->busy = false;
            return -7;
        }

        fat_open(IF_MV2(volume,)
                 ce->startcluster,
                 &(file->fatfile),
                 NULL);
        file->size = ce->size;
        file->attr = ce->attribute;
        file->cacheoffset = -1;
        file->fileoffset = 0;

        return fd;
    }
#endif

    strlcpy(pathnamecopy, pathname, sizeof(pathnamecopy));

    /* locate filename */
    name=strrchr(pathnamecopy+1,'/');
    if ( name ) {
        *name = 0; 
        dir = opendir_uncached(pathnamecopy);
        *name = '/';
        name++;
    }
    else {
        dir = opendir_uncached("/");
        name = pathnamecopy+1;
    }
    if (!dir) {
        DEBUGF("Failed opening dir\n");
        errno = EIO;
        file->busy = false;
        return -4;
    }

    if(name[0] == 0) {
        DEBUGF("Empty file name\n");
        errno = EINVAL;
        file->busy = false;
        closedir_uncached(dir);
        return -5;
    }

    /* scan dir for name */
    while ((entry = readdir_uncached(dir))) {
        if ( !strcasecmp(name, entry->d_name) ) {
            fat_open(IF_MV2(dir->fatdir.file.volume,)
                     entry->startcluster,
                     &(file->fatfile),
                     &(dir->fatdir));
            file->size = file->trunc ? 0 : entry->size;
            file->attr = entry->attribute;
            break;
        }
    }