Thread: Max file size

  1. #1
    Registered User
    Join Date
    Dec 2007

    Max file size

    Hello again,

    If ftell() return long type, is that mean that the maximum file size possible is LONG_MAX ??

  2. #2
    Join Date
    Oct 2007
    Inside my computer
    Pretty much. Anything larger and you will have to resort to other APIs. I don't think the C standard has any other function for getting filesize, and especially not bigger than long.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    Note here: just because ftell() can't return the correct size of the file does not mean this is the largest possible file-size. Native APIs may have different ways to give the value (e.g. a 64-bit integer even if "long" is 32-bit).

    Linux/Posix allows for a "fgetpos()" that has a larger value, for example.

    So, what I'm trying to say is "ftell() doesn't work on files longer than LONG_MAX", but it doesn't actually say ANYTHING about the largest possible file in that filesystem, OS or C runtime library.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  4. #4
    Registered User
    Join Date
    Dec 2007

    I've created a 3000,000 kb.
    ftell() gave the right result until MAX_LONG after that it return -1.

    I actully created 9.5 GB file.
    Anyone know what is the limit in windows XP?

    Many thanks

  5. #5

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