Function call problem (segmentation fault)

Hello,

Considering this project:

I try to call a function in benchmark.c file. The existing calls work well in search.c file. But my newer call causes segmentation fault. I suspect there can be some sort of initializing code. I tried various ideas, none worked. part of code:

benchmark.c:

Code:

---

void benchmark(Position *current, char *str)
{
    [CODE BEFORE]

    strcpy(buf, "fen ");
    strncat(buf, fens[i], 127 - 4);
    buf[127] = 0;


    position(&pos, buf);
    //evaluate(&pos); // causes problems, from evaluate.h
   
    [CODE AFTER]
}

---

Can you help me correctly call this function ?

Not enough information to know what "Position" is.

We don't know the size of str, buf, or fens, or what they contain.

You need to provide a small complete program so we can compile and test, and know what all the variables are.

We should not have to download many files from a complex program on another site to answer your question.

I have no idea on how to produce a simple code based on the original one. I may ask the question on a place , where some may know the project's internals. Thanks anyway.