> +/* Helper function to ensure that we are opening a file and not a directory */
quoted text
> +static FILE *open_file(char *full_path)
> +{
> +       struct stat st_buf;
> +       if (stat(full_path, &st_buf) || !S_ISREG(st_buf.st_mode))
> +               return NULL;
> +       return (fopen(full_path, "r"));
> +}

That looks wrong.  stat+fopen has a pointless race condition that
open+fstat+fdopen would not have.

Morten
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