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I didn't see the second calloc() down below, I thought that was your only memory allocation.

You're not passing a reference to anything. You are passing a pointer to a pointer, but in the...

temp = realloc(filelist, (items+1) * sizeof(*temp));How many bytes of memory do you think this is allocating? I bet if you printed out the value of items and sizeof(*temp), you would be surprised.
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