Check entered address range is valid

This is a discussion on Check entered address range is valid within the C Programming forums, part of the General Programming Boards category; Hey I would like to know how to check whether a user specified start address and end address (for data ...

  1. #1
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    Check entered address range is valid

    Hey

    I would like to know how to check whether a user specified start address and end address (for data locations) is valid or not

    Is there a way to check the given address is actually part of the program?

    I have malloc-ed to a variable, so would the correct method be to check whether the user inputted address is within that variable's scope?

    Thanks

  2. #2
    C++ Witch laserlight's Avatar
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    Err... why would be user be providing an object's address as input?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    I want to be able to write the values from a start address to the given end address to a file.

    So the value starting at for example, *(hex+10) can be the first value written, to *(hex+20) when in reality the data starts from *(hex)

    So I just need to either check the address provided is within the program's allocation and that its within the hex malloc

  4. #4
    C++ Witch laserlight's Avatar
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    Sounds like you should be writing offsets instead, e.g., 10 and 20.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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    cheers

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