FILL_CHAR
memset(real, FILL_CHAR, sizeof(real));
memset(test, FILL_CHAR, sizeof(test));
memset(buf, FILL_CHAR, sizeof(buf));
memset(test + f, FILL_CHAR, sizeof(test) - f);
memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
if (memchr_inv(test_buffer + written + 1, FILL_CHAR, bufsize - (written + 1))) {
if (memchr_inv(test_buffer + bufsize, FILL_CHAR, BUF_SIZE + PAD_SIZE - bufsize)) {