Don't worry, I won't let you overflow.
Is anyone operating on you? I won't let you overflow by that.
Do you want to link yourself? I won't let you overflow by that.
Is there an expression of the unspecified? I won't let you overflow by that.
Is someone really crossing the line? I won't let you overflow by that.
Do you have some clefts? I will mend them and you won't overflow.
What am I?
Subtle Hint:
Do you want to answer for an action? I am the action.
Moderate Hint:
Just let me go. You are the content.
Decisive Hint:
One letter modified, I am a language.