Function test_cirbuf_align_left

dpdk/app/test/test_cmdline_cirbuf.c:778–986

test left alignment */

/* test left alignment */
static int
test_cirbuf_align_left(void)
{
#define HALF_OFFSET CMDLINE_TEST_BUFSIZE / 2
#define SMALL_OFFSET HALF_OFFSET / 2
/* resulting buffer lengths for each of the test cases */
#define LEN1 HALF_OFFSET - SMALL_OFFSET - 1
#define LEN2 HALF_OFFSET + SMALL_OFFSET + 2
#define LEN3 HALF_OFFSET - SMALL_OFFSET
#define LEN4 HALF_OFFSET + SMALL_OFFSET - 1

	struct cirbuf cb;
	char buf[CMDLINE_TEST_BUFSIZE];
	char tmp[CMDLINE_TEST_BUFSIZE];
	unsigned i;

	/*
	 * align left when start < end and start in left half
	 */

	/*
	 * initialize circular buffer
	 */
	memset(buf, 0, sizeof(buf));
	if (cirbuf_init(&cb, buf, 0, sizeof(buf)) < 0) {
		printf("Error: failed to initialize circular buffer!\n");
		return -1;
	}

	/* push end into left half */
	for (i = 0; i < HALF_OFFSET - 1; i++)
		cirbuf_add_tail_safe(&cb, 't');

	/* push start into left half < end */
	for (i = 0; i < SMALL_OFFSET; i++)
		cirbuf_del_head_safe(&cb);

	/* align */
	if (cirbuf_align_left(&cb) < 0) {
		printf("Error: alignment failed!\n");
		return -1;
	}

	/* verify result */
	if (cb.start != 0 || cb.len != LEN1 || cb.end != cb.len - 1) {
		printf("Error: buffer alignment is wrong!\n");
		return -1;
	}

	/*
	 * align left when start > end and start in left half
	 */

	/*
	 * reinitialize circular buffer
	 */
	memset(buf, 0, sizeof(buf));
	if (cirbuf_init(&cb, buf, 0, sizeof(buf)) < 0) {