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In eofnormalize(), a call to a file positioning function is needed between input and output.
I no longer can edit my post, but I'd change the function to:


#include <stdio.h>

int...

My code works for me:

#include <stdio.h>
#include <stdlib.h>

int eofnormalize(const char *fname) {
FILE *h;
int ch;

if ((h = fopen(fname, "a+b")) == NULL) return 1;

Is this the expected outcome?

You opened the FILE for append mode, but then try to read from it ... this is a big no no: don't do that!
Open the file for reading / appending in binary mode like I suggested

if (...

Untested:


FILE *inSalesPtr;

//open the file for binary read/append
if ((inSalesPtr = fopen("sales.txt", "a+b")) == NULL) exit(1); /* exit on error */

// set the file position to the very...