C++ readable函数代码示例

static const wchar_t *searchpath(lua_State *L, const char *name,
                                 const wchar_t *path,
                                 const wchar_t *sep,
                                 const wchar_t *dirsep)
{
	const wchar_t *wname;
	luaL_Buffer msg;  /* to build error message */
	luaL_buffinit(L, &msg);
	lua_pushstring(L, name);
	wname = utf8_to_utf16(L, -1, NULL);  /* `name' is encoded in UTF-8 */

	if(*sep != 0)   /* non-empty separator? */
		wname = LF_Gsub(L, wname, sep, dirsep);  /* replace it by 'dirsep' */

	while((path = pushnexttemplate(L, path)) != NULL)
	{
		const wchar_t *filename = LF_Gsub(L, (const wchar_t*)lua_tostring(L, -1),
		                                  LUA_PATH_MARK, wname);
		lua_remove(L, -2);  /* remove path template */

		if(readable(filename))   /* does file exist and is readable? */
			return filename;  /* return that file name */

		push_utf8_string(L, filename, -1);
		lua_pushfstring(L, "\n\tno file " LUA_QS, lua_tostring(L, -1));
		lua_remove(L, -2);  /* remove UTF-8 file name */
		lua_remove(L, -2);  /* remove UTF-16 file name */
		luaL_addvalue(&msg);  /* concatenate error msg. entry */
	}

	luaL_pushresult(&msg);  /* create error message */
	return NULL;  /* not found */
}

void BeagleBone::read(char *str, const int len) {
    NVIC_DisableIRQ(UART3_IRQn);
    char c = 0;
    for (int i = 0; c != '\n' && i < len; i++) {
        if (!readable()) {
            NVIC_EnableIRQ(UART3_IRQn);
            while(!readable());
            NVIC_DisableIRQ(UART3_IRQn);
        }
        c = rx_buffer_[rx_out_];
        str[i] = c;
        rx_out_ = (rx_out_ + 1) % kBufferLen;
    }
    NVIC_EnableIRQ(UART3_IRQn);
    return;
}

static const char *pushfilename (lua_State *L, const char *name) 
{
  const char *path;
  const char *filename;
  luaQ_getfield(L, LUA_GLOBALSINDEX, "package");
  luaQ_getfield(L, -1, "cpath");
  lua_remove(L, -2);
  if (! (path = lua_tostring(L, -1)))
    luaL_error(L, LUA_QL("package.cpath") " must be a string");
  lua_pushliteral(L, ""); 
  while ((path = pushnexttemplate(L, path))) {
    filename = luaL_gsub(L, lua_tostring(L, -1), "?", name);
    lua_remove(L, -2);
    if (readable(filename))
      { // stack:  cpath errmsg filename
        lua_remove(L, -3);
        lua_remove(L, -2);
        return lua_tostring(L, -1);
      }
    lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
    lua_remove(L, -2); /* remove file name */
    lua_concat(L, 2);  /* add entry to possible error message */
  }
  lua_pushfstring(L, "module " LUA_QS " not found", name);
  lua_replace(L, -3);
  lua_concat(L, 2);
  lua_error(L);
  return 0;
}

int main(int argc, char** argv){

	if(argc > 2){
		fprintf(stderr, "Too many command line arguments, expected 0..1");
		return -1;
	}

	char* path;
	path = calloc(4096, sizeof(char));

	if (argc == 2){		
		path = argv[1];
	} else {
		getcwd(path, 4096);
	}

	readable(path);

	//printf("%s \n", path);
	//if (isDirectory(path)){
	//	printf("Is a directory!");
	//}

	return 0;
}

void
pickPixmap(Display * display, Drawable drawable, char *name,
	   int default_width, int default_height, unsigned char *default_bits,
	   int *width, int *height, Pixmap * pixmap,
	   int *graphics_format)
{
	int         x_hot, y_hot;	/* dummy */

	if (name && *name) {
		if (readable(name)) {
			if (BitmapSuccess == XReadBitmapFile(display, drawable, name,
			     (unsigned int *) width, (unsigned int *) height,
						   pixmap, &x_hot, &y_hot)) {
				*graphics_format = IS_XBMFILE;
			}
			if (*graphics_format <= 0)
				(void) fprintf(stderr,
					    "\"%s\" not xbm format\n", name);
		} else {
			(void) fprintf(stderr,
				       "could not read file \"%s\"\n", name);
		}
	}
	if (*graphics_format <= 0) {
		*width = default_width;
		*height = default_height;
		*graphics_format = IS_XBM;
		*pixmap = XCreateBitmapFromData(display, drawable,
				     (char *) default_bits, *width, *height);
	}
}

char *
getModeFont(char *infont)
{
	static char *localfont = (char *) NULL;

	if (localfont != NULL) {
		free(localfont);
		localfont = (char *) NULL;
	}
	if (infont && strlen(infont)) {
#ifdef STANDALONE
		localfont = infont;
#else
		if ((localfont = (char *) malloc(256)) == NULL) {
			(void) fprintf(stderr , "no memory for \"%s\"\n" ,
				infont);
			return (char *) NULL;
		}
		(void) strncpy(localfont, infont, 256);
#if HAVE_DIRENT_H
		getRandomFile(infont, localfont);
#endif
#endif /* STANDALONE */
	}
	if (localfont && strlen(localfont) && !readable(localfont)) {
		(void) fprintf(stderr,
		       "could not read file \"%s\"\n", localfont);
		if (localfont) {
			free(localfont);
			localfont = (char *) NULL;
		}
	}
	return localfont;
}

static const char *searchpath (lua_State *L, const char *name,
			       const char *path, const char *sep,
			       const char *dirsep)
{
  luaL_Buffer msg;  /* to build error message */
  luaL_buffinit(L, &msg);
  if (*sep != '\0')  /* non-empty separator? */
    name = luaL_gsub(L, name, sep, dirsep);  /* replace it by 'dirsep' */
  while ((path = pushnexttemplate(L, path)) != NULL) {
    const char *filename = luaL_gsub(L, lua_tostring(L, -1),
				     LUA_PATH_MARK, name);
    lua_remove(L, -2);  /* remove path template */
    // @Voidious: Use lua_State->cwd in place of current dir.
    const char *absFilename = luaL_gsub(L, filename, "~", lua_getcwd(L));
    if (readable(absFilename)) { /* does file exist and is readable? */
      lua_pop(L, 1);
#if defined(_WIN32)
      const char *relativeFilename = luaL_gsub(L, filename, "~\\", "");
#else
      const char *relativeFilename = luaL_gsub(L, filename, "~/", "");
#endif
      lua_remove(L, -2);  /* remove file name */
      return relativeFilename;
    }
    lua_pop(L, 1);
    lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
    lua_remove(L, -2);  /* remove file name */
    luaL_addvalue(&msg);  /* concatenate error msg. entry */
  }
  luaL_pushresult(&msg);  /* create error message */
  return NULL;  /* not found */
}

//0 for non-blocking (returns immediately), -1 for infinite blocking
/*virtual*/ int USBSerialStream::write(uint8_t* buf, size_t length, uint32_t timeout/*=-1*/)
{
  DBG("Trying to write %d chars", length);
  do
  {
    int ret = waitSpace(timeout);
    if(ret)
    {
      WARN("Error %d while waiting for space", ret);
      return ret;
    }
    int s = space(); //Prevent macro issues
    int writeLen = MIN( s, length );
    DBG("Writing %d chars", writeLen);
    setupWriteableISR(false);
    while(writeLen)
    {
      m_outBuf.queue(*buf);
      buf++;
      length--;
      writeLen--;
    }
    //If m_serial tx fifo is empty we need to start the packet write
    if( m_outBuf.available() && m_serialTxFifoEmpty )
    {
      writeable();
    }
    setupWriteableISR(true);
  } while(length);

  DBG("Write successful");

  readable();
  return OK;
}

static const char *findfile (lua_State *L, const char *name,
                                           const char *pname) {
  get_current_path(L, 2); /* ROCKLUA ADDED */
  const char *current_path = lua_tostring(L, -1);
  const char *path;

  name = luaL_gsub(L, name, ".", LUA_DIRSEP);
  lua_getfield(L, LUA_ENVIRONINDEX, pname);
  path = lua_tostring(L, -1);
  if (path == NULL)
    luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
  lua_pushliteral(L, "");  /* error accumulator */
  while ((path = pushnexttemplate(L, path)) != NULL) {
    const char *filename;
    filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
    if(current_path != NULL) filename = luaL_gsub(L, filename, "$", current_path);
    lua_remove(L, -2);  /* remove path template */
    if (readable(filename))  /* does file exist and is readable? */
      return filename;  /* return that file name */
    lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
    lua_remove(L, -2);  /* remove file name */
    lua_concat(L, 2);  /* add entry to possible error message */
  }
  return NULL;  /* not found */
}

    long connection::
    read (
        char* buf, 
        long num,
        unsigned long timeout
    )
    {
        if (readable(timeout) == false)
            return TIMEOUT;

        const long max_recv_length = 1024*1024*100;
        // Make sure to cap the max value num can take on so that if it is 
        // really large (it might be big on 64bit platforms) so that the OS
        // can't possibly get upset about it being large.
        const long length = std::min(max_recv_length, num);
        long status = recv(connection_socket,buf,length,0);
        if (status == SOCKET_ERROR)
        {
            // if this error is the result of a shutdown call then return SHUTDOWN
            if (sd_called())
                return SHUTDOWN;
            else
                return OTHER_ERROR;
        }
        else if (status == 0 && sd_called())
        {
            return SHUTDOWN;
        }
        return status;
    }

uint32_t MessageBuffer::fullForGet(mxos::IOVEC* vec, uint32_t count) const
{
	MX_ASSERT(NULL != vec && count > 0);
	int rable = readable();
	MX_ASSERT(rable > 0);

	int len = capacity_ - readPos_;

	if (len > rable)
	{
		len = rable;
	}

	vec[0].iov_base = buffer_ + readPos_;
	vec[0].iov_len = len;

	rable -= len;

	if (rable > 0 && count > 1)
	{
		vec[1].iov_base = buffer_;
		vec[1].iov_len = rable;
		return 2;
	}

	return 1;
}

static void
format(FTSENT *cur, FTSENT_PRT *prt)
{
    char buf[NAME_BUFSZ];
    cur->fts_pointer=prt;

    if (f_inodenum)
        UP(buf, "%llu", (LLU)cur->fts_statp->st_ino, prt->s_inode);

    /**
     * st_blocks is a calculated number of blocks via file system block size
     * the value is the same with that displayed when using default ls
     * it can also be calculated via:
     * howmany(st_blocks, blocksize) e.g. st_blocks/blocksize
     */
    if (f_longfmt || f_dispblock) {
        LL b=(LL)cur->fts_statp->st_blocks;
        b/=block_size_factor;
        UP(buf, "%lld", b, prt->s_block);
        prt->t_block+=b;
    }

    if (f_longfmt) {
        mode_t m=cur->fts_statp->st_mode;
        if (f_kilobytes) {
            LLU s=cur->fts_statp->st_size;
            UP(buf, "%llu", (LLU)(s/1024.0+0.5), prt->s_float);
        } else if (f_readable) {
            LLU s=cur->fts_statp->st_size;
            char *read=readable(s);
            prt->s_read=MAX(prt->s_read, strlen(read));
            free(read);
        } else {
            UP(buf, "%llu", (LLU)cur->fts_statp->st_size, prt->s_size);
        }
        UP(buf, "%hu", (short)cur->fts_statp->st_nlink, prt->s_link);
        if (S_ISCHR(m) || S_ISBLK(m)) {
            UP(buf, "%d", major(cur->fts_statp->st_rdev), prt->s_major);
            UP(buf, "%d", minor(cur->fts_statp->st_rdev), prt->s_minor);
        }
    }

    if (f_numric) {
        UP(buf, "%d", cur->fts_statp->st_uid, prt->s_uid);
        UP(buf, "%d", cur->fts_statp->st_gid, prt->s_gid);
    } else if (f_longfmt) {
        char *username=get_username(cur->fts_statp->st_uid);
        char *groupname=get_groupname(cur->fts_statp->st_uid);
        if (username!=NULL)
            UP(buf, "%s", username, prt->s_uname);
        if (groupname!=NULL)
            UP(buf, "%s", groupname, prt->s_gname);
        free(username);
        free(groupname);
    }

    UP(buf, "%s", cur->fts_name, prt->s_name);
    prt->col_length=MAX(prt->col_length, prt->s_name);
    prt->entries++;
}

    void NetMessage::read_string(std::string *out_value)
    {
        assert(readable() > 0);
        const uint8_t *eos = data();
        while (*eos++);
        size_t lenght = eos - data() - 1;
        assert(readable() >= lenght);

        out_value->clear();
        if (lenght > 0)
        {
            out_value->resize(lenght);
            memcpy(const_cast<char*>(out_value->data()), data(), lenght);
            retrieve(lenght);
        }
    }

Value Property::get(const UserObject& object) const
{
    // Check if the property is readable
    if (!readable(object))
        PONDER_ERROR(ForbiddenRead(name()));

    return getValue(object);
}

//-------------------------------------------------------------------------------------------------
bool DictionaryProperty::exists(const UserObject& object, const camp::Value& key) const
{
    // Check if the property is readable
    if (!readable(object))
        CAMP_ERROR(ForbiddenRead(name()));

    return queryExists(object,key);
}