How to Create sparse file with alternate data and hole.

This is a discussion on How to Create sparse file with alternate data and hole. within the C Programming forums, part of the General Programming Boards category; Hi All, I have to write a program in c where I have to create a file with known pattern ...

  1. #1
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    How to Create sparse file with alternate data and hole.

    Hi All,

    I have to write a program in c where I have to create a file with known pattern data and hole in it, and it should be such that a 4k data and then it will skip 12K and then again it will write the same 4k data .

    It should be such that

    data hole data hole data
    (4k) (12K) (4k) (12K) (4k)

    Please help me .....

  2. #2
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    Someone actually wants you to write a program that wastes disk space?

    Ok... look up fseek(), fread() and fwrite() in your library documentation. That should give you some beginning ideas to build on.

  3. #3
    and the hat of wrongness Salem's Avatar
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    Sparse Files
    If you write your 4K, then seek() forward 12K you may (or may not) end up with a sparse file.

    Sparse files are a feature of your file system, perhaps even your OS, and maybe even your compiler run-time library.
    You need to be more specific than "do this in C".
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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