stack overflow...need help

This is a discussion on stack overflow...need help within the C Programming forums, part of the General Programming Boards category; I just translated a Fortran program to C. The C program consists of a main program and several functions. There ...

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    Unhappy stack overflow...need help

    I just translated a Fortran program to C. The C program consists of a main program and several functions. There is one structure that contains integers, integer arrays, character types, and character arrays that I pass with each call to each function. The main program calls one function which calls another function and depending on specific conditions being satisfied this function calls different functions. Well the problem I am experiencing is that a particular function gets called several hundreds of times. This functions purpose is to read a line using fgets from a file and then using sscanf get the required strings from each line. After several hundred iterations of calling this function the program aborts with a stack overflow. In the debugger, I looked at all of the elements contained in the structure including the arrays and they all looked good. Can anyone tell me what might be happening? If needed I will post my code or part of it. I would have done it but it's length is about 2K lines. Please respond.
    Thanks!! Kim

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    and the hat of wrongness Salem's Avatar
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    When dealing with arrays, did you remember the following

    For an N element array,
    the subscripts in Fortran are 1..N
    the subscripts in C are 0..N-1

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    Wink

    I took that into account.

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    and the hat of wrongness Salem's Avatar
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    Look for this at the bottom of the reply
    Attach file:
    Maximum size: 102400 bytes

    Put your source code and data file in a zip file, and attach it

    Failing that, post it on a website and post the link here

    Make sure it's reasonably ANSI-C
    Lots of OS/compiler specific stuff makes it hard to work with

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    Registered User raimo's Avatar
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    YOU wrote 2K lines of code and then ask others what might be wrong with it?

    Post a couple of lines in the function if it is possible. If not, try to remove the parts which do not cause the problem(and keep a backup)
    and post the rest of it.

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    Smile

    I need to clean the code up a little then I'll zip it and attach it. Thanks so much!

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    If you are getting stack overflow, it sounds like you have a recursion problem.

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    Im back! shaik786's Avatar
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    Try to avoid the number of times the function recurses or increase the STACK SIZE of the process

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    I apologize for the long delay in replying. How can I increase the stack size. I don't know if it matters or not but I am running my application using MS C++ Developer Studio. Thanks! Kim

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    Im back! shaik786's Avatar
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    I don't really know if MS VC++ provides with a function called setrlimit(). If it provides this function, you can accomplish that task with this call.

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    Usually, you can set your stacksize in project settings in the compiler. However, be sure that it's not a recursion problem or you'll never have a large enough stack.

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    I don't know if it would be a recursion problem. The function that gets called hundreds of times only reads a line from a file using fgets. It then uses sscanf to get the required information from the line that was just read in and then leaves. Woudl this be recursion? Kim

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    and the hat of wrongness Salem's Avatar
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    Recursion is where a function calls itself - this doesn't appear to be the problem in this case.

    Here are a couple of possible causes
    1) lots of large arrays as local variables
    2) any kind of data overrun of local variables - especially arrays.

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