> /* map the file and load an extra page in case the new line expands the
> file across the page boundary; adding 2 allows for the truncating
> effect of integer division. Forcing an extra page ensures
> that we can identify the end of the buffer by finding a NUL */
No, it does not. Access past the EOF will give you page fault, not zero-filled
page.
> if ((int)(buf = (char *) mmap(buf, ((c / getpagesize()) + 2) *
> getpagesize(),
> PROT_NONE, MAP_SHARED, fileno(ucf), 0)) == -1) {
> perror("Could not map user_clusters");
> exit(LOC_ERR_READ_FAIL);
> }
