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interview Question - buffer overflow
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Tiya Khambadkone
Ranch Hand
Joined: Sep 15, 2011
Posts: 40
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given a buffer A (size unknown , length known) attach another buffer B to the end of buffer A such that A does not over-flow. both buffer's size is unknown and length is known.
How will you achieve this ?
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Campbell Ritchie
Sheriff
Joined: Oct 13, 2005
Posts: 32620
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Is that actually a Java question? It sounds like the sort of thing which you do with malloc and clear, in C.
If it is an interview question, what did you say?
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Winston Gutkowski
Bartender
Joined: Mar 17, 2011
Posts: 4734
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Tiya Khambadkone wrote:given a buffer A (size unknown , length known) attach another buffer B to the end of buffer A such that A does not over-flow. both buffer's size is unknown and length is known.
How will you achieve this ?
Simple answer: Without
(a) some way of determining the "end" of a buffer.
AND
(b) some way of knowing the capacity of buffer A (note: NOT necessarily the same as its length).
you can't.
Winston
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Isn't it funny how there's always time and money enough to do it WRONG?
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dennis deems
Ranch Hand
Joined: Mar 12, 2011
Posts: 808
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Wouldn't this do the trick?
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Henry Wong
author
Sheriff
Joined: Sep 28, 2004
Posts: 16683
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Dennis Deems wrote:Wouldn't this do the trick?
Sure, but it is also *not* needed. Remember that a string buffer will ensure its capacity automatically. You just append the other item, and it is done for you.
I am agreeing that this is likely a C question -- in that it is asking how to ensure capacity with a malloc'ed buffer.
Henry
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Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
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subject: interview Question - buffer overflow
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