298   size_t pos = luaL_optinteger(L, 3, 1) - 1;  in b_unpack()  local
304     pos += gettoalign(pos, &h, opt, size);  in b_unpack()
305     luaL_argcheck(L, pos+size <= ld, 2, "data string too short");  in b_unpack()
311         lua_Number res = getinteger(data+pos, h.endian, issigned, size);  in b_unpack()
320         memcpy(&f, data+pos, size);  in b_unpack()
327         memcpy(&d, data+pos, size);  in b_unpack()
338           luaL_argcheck(L, pos+size <= ld, 2, "data string too short");  in b_unpack()
340         lua_pushlstring(L, data+pos, size);  in b_unpack()
344         const char *e = (const char *)memchr(data+pos, '\0', ld - pos);  in b_unpack()
347         size = (e - (data+pos)) + 1;  in b_unpack()
348         lua_pushlstring(L, data+pos, size - 1);  in b_unpack()
353     pos += size;  in b_unpack()
355   lua_pushinteger(L, pos + 1);  in b_unpack()
363   size_t pos = 0;  in b_size()  local
368     pos += gettoalign(pos, &h, opt, size);  in b_size()
375     pos += size;  in b_size()
377   lua_pushinteger(L, pos);  in b_size()