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ringbuf-test.c
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ringbuf-test.c
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/*
* test-ringbuf.c - unit tests for C ring buffer implementation.
*
* Written in 2011 by Drew Hess <[email protected]>.
*
* To the extent possible under law, the author(s) have dedicated all
* copyright and related and neighboring rights to this software to
* the public domain worldwide. This software is distributed without
* any warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication
* along with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <signal.h>
#include <assert.h>
#include "ringbuf.h"
/*
* Fill a buffer with a test pattern.
*/
void *
fill_buffer(void *buf, size_t buf_size, const char *test_pattern)
{
size_t pattern_size = strlen(test_pattern);
size_t nblocks = buf_size / pattern_size;
uint8_t *p = buf;
size_t n;
for (n = 0; n != nblocks; ++n, p += pattern_size)
memcpy(p, (const void *) test_pattern, pattern_size);
memcpy(p, (const void *) test_pattern, buf_size % pattern_size);
return buf;
}
int rdfd = -1;
int wrfd = -1;
char rd_template[] = "/tmp/tmpXXXXXXringbuf";
char wr_template[] = "/tmp/tmpXXXXXXringbuf-wr";
void
cleanup()
{
if (rdfd != -1) {
close(rdfd);
unlink(rd_template);
}
if (wrfd != -1) {
close(wrfd);
unlink(wr_template);
}
}
void
sigabort(int unused)
{
cleanup();
exit(1);
}
#define START_NEW_TEST(test_num) \
fprintf(stderr, "Test %d...", (++test_num));
#define END_TEST(test_num) \
fprintf(stderr, "pass.\n");
/* Default size for these tests. */
#define RINGBUF_SIZE 4096
int
main(int argc, char **argv)
{
if (atexit(cleanup) == -1) {
fprintf(stderr, "Can't install atexit handler, exiting.\n");
exit(98);
}
/*
* catch SIGABRT when asserts fail for proper test file
* cleanup.
*/
struct sigaction sa, osa;
sa.sa_handler = sigabort;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGABRT, &sa, &osa) == -1) {
fprintf(stderr, "Can't install SIGABRT handler, exiting.\n");
exit(99);
}
ringbuf_t rb1 = ringbuf_new(RINGBUF_SIZE - 1);
int test_num = 0;
/*
* N.B.: these tests check both the ringbuf_t interface *and* a
* particular implementation. They are not black-box tests. If you
* make changes to the ringbuf_t implementation, some of these
* tests may break.
*/
/* We use the base pointer for some implementation testing. */
const uint8_t *rb1_base = ringbuf_head(rb1);
/* Initial conditions */
START_NEW_TEST(test_num);
assert(ringbuf_buffer_size(rb1) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
END_TEST(test_num);
/* freeing a ring buffer sets the pointer to 0 */
START_NEW_TEST(test_num);
ringbuf_free(&rb1);
assert(!rb1);
END_TEST(test_num);
/* Different sizes */
rb1 = ringbuf_new(24);
rb1_base = ringbuf_head(rb1);
START_NEW_TEST(test_num);
assert(ringbuf_buffer_size(rb1) == 25);
assert(ringbuf_capacity(rb1) == 24);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
ringbuf_free(&rb1);
assert(!rb1);
END_TEST(test_num);
rb1 = ringbuf_new(RINGBUF_SIZE - 1);
rb1_base = ringbuf_head(rb1);
/* ringbuf_reset tests */
START_NEW_TEST(test_num);
ringbuf_memset(rb1, 1, 8);
ringbuf_reset(rb1);
assert(ringbuf_buffer_size(rb1) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
END_TEST(test_num);
START_NEW_TEST(test_num);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1)); /* overflow */
ringbuf_reset(rb1);
assert(ringbuf_buffer_size(rb1) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
END_TEST(test_num);
/* ringbuf_memset with zero count */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 1, 0) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
END_TEST(test_num);
uint8_t *buf = malloc(RINGBUF_SIZE * 2);
memset(buf, 57, RINGBUF_SIZE);
memset(buf + RINGBUF_SIZE, 58, RINGBUF_SIZE);
/* ringbuf_memset a few bytes of data */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, 7) == 7);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 7);
assert(ringbuf_bytes_used(rb1) == 7);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), 7) == 0);
END_TEST(test_num);
/* ringbuf_memset full capacity */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memset, twice */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, 7) == 7);
assert(ringbuf_memset(rb1, 57, 15) == 15);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_used(rb1) == 7 + 15);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - (7 + 15));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), 7 + 15) == 0);
END_TEST(test_num);
/* ringbuf_memset, twice (to full capacity) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE - 2) == RINGBUF_SIZE - 2);
assert(ringbuf_memset(rb1, 57, 1) == 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memset, overflow by 1 byte */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memset, twice (overflow by 1 byte on 2nd copy) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(ringbuf_memset(rb1, 57, 1) == 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/*
* ringbuf_memset, attempt to overflow by 2 bytes, but
* ringbuf_memset will stop at 1 byte overflow (length clamping,
* see ringbuf_memset documentation).
*/
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE + 1) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_head(rb1) == rb1_base);
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/*
* ringbuf_memset, twice, overflowing both times.
*/
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(ringbuf_memset(rb1, 57, RINGBUF_SIZE) == RINGBUF_SIZE);
assert(ringbuf_memset(rb1, 58, RINGBUF_SIZE) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_head(rb1) == rb1_base);
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + RINGBUF_SIZE, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/*
* The length of test_pattern should not fit naturally into
* RINGBUF_SIZE, or else it won't be possible to detect proper
* wrapping of the head pointer.
*/
const char test_pattern[] = "abcdefghijk";
assert((strlen(test_pattern) % RINGBUF_SIZE) != 0);
fill_buffer(buf, RINGBUF_SIZE * 2, test_pattern);
/* ringbuf_memcpy_into with zero count */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, 0) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_memcpy_into a few bytes of data */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, strlen(test_pattern)) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - strlen(test_pattern));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp(test_pattern, ringbuf_tail(rb1), strlen(test_pattern)) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_memcpy_into full capacity */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, RINGBUF_SIZE - 1) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_memcpy_into, twice */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, strlen(test_pattern)) == ringbuf_head(rb1));
assert(ringbuf_memcpy_into(rb1, buf + strlen(test_pattern), strlen(test_pattern) - 1) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - (2 * strlen(test_pattern) - 1));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), 2 * strlen(test_pattern) - 1) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_memcpy_into, twice (to full capacity) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, RINGBUF_SIZE - 2) == ringbuf_head(rb1));
assert(ringbuf_memcpy_into(rb1, buf + RINGBUF_SIZE - 2, 1) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_into, overflow by 1 byte */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, RINGBUF_SIZE) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 1, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_into, twice (overflow by 1 byte on 2nd copy) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, RINGBUF_SIZE - 1) == ringbuf_head(rb1));
assert(ringbuf_memcpy_into(rb1, buf + RINGBUF_SIZE - 1, 1) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 1, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_into, overflow by 2 bytes (will wrap) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_memcpy_into(rb1, buf, RINGBUF_SIZE + 1) == ringbuf_head(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_head(rb1) == rb1_base + 1);
assert(ringbuf_tail(rb1) == rb1_base + 2);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 2, RINGBUF_SIZE - 2) == 0);
assert(strncmp((const char *) rb1_base, (const char *) buf + RINGBUF_SIZE, 1) == 0);
END_TEST(test_num);
rdfd = mkstemps(rd_template, strlen("ringbuf"));
assert(rdfd != -1);
assert(write(rdfd, buf, RINGBUF_SIZE * 2) == RINGBUF_SIZE * 2);
/* ringbuf_read with zero count */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, 0) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(*(char *)ringbuf_head(rb1) == '\1');
assert(lseek(rdfd, 0, SEEK_CUR) == 0);
END_TEST(test_num);
/* ringbuf_read a few bytes of data */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, strlen(test_pattern)) == strlen(test_pattern));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - strlen(test_pattern));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp(test_pattern, ringbuf_tail(rb1), strlen(test_pattern)) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_read full capacity */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp(ringbuf_tail(rb1), (const char *) buf, RINGBUF_SIZE - 1) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_read, twice */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, strlen(test_pattern)) == strlen(test_pattern));
assert(ringbuf_read(rdfd, rb1, strlen(test_pattern) - 1) == strlen(test_pattern) - 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - (2 * strlen(test_pattern) - 1));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), 2 * strlen(test_pattern) - 1) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_read, twice (to full capacity) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, RINGBUF_SIZE - 2) == RINGBUF_SIZE - 2);
assert(ringbuf_read(rdfd, rb1, 1) == 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(strncmp((const char *) buf, ringbuf_tail(rb1), RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_read, overflow by 1 byte */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, RINGBUF_SIZE) == RINGBUF_SIZE);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 1, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_read, twice (overflow by 1 byte on 2nd copy) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(ringbuf_read(rdfd, rb1, 1) == 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 1, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
/* ringbuf_read, try to overflow by 2 bytes; will return a short count */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, RINGBUF_SIZE + 1) == RINGBUF_SIZE); /* short count */
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == 0);
assert(ringbuf_bytes_used(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
/* head should point to the beginning of the buffer */
assert(ringbuf_head(rb1) == rb1_base);
/* tail should have bumped forward by 1 byte */
assert(ringbuf_tail(rb1) == rb1_base + 1);
assert(strncmp(ringbuf_tail(rb1), (const char *) buf + 1, RINGBUF_SIZE - 1) == 0);
END_TEST(test_num);
uint8_t *dst = malloc(RINGBUF_SIZE * 2);
/* ringbuf_memcpy_from with zero count, empty ring buffer */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
assert(ringbuf_memcpy_from(dst, rb1, 0) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
assert(strncmp((const char *) dst, (const char *) buf, RINGBUF_SIZE * 2) == 0);
END_TEST(test_num);
/*
* The length of test_pattern2 should not fit naturally into
* RINGBUF_SIZE, or else it won't be possible to detect proper
* wrapping of the head pointer.
*/
const char test_pattern2[] = "0123456789A";
assert((strlen(test_pattern2) % RINGBUF_SIZE) != 0);
uint8_t *buf2 = malloc(RINGBUF_SIZE * 2);
fill_buffer(buf2, RINGBUF_SIZE * 2, test_pattern2);
/* ringbuf_memcpy_from with zero count, non-empty ring buffer */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, test_pattern2, strlen(test_pattern2));
assert(ringbuf_memcpy_from(dst, rb1, 0) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - strlen(test_pattern2));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern2));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
assert(strncmp((const char *) dst, (const char *) buf, RINGBUF_SIZE * 2) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from a few bytes of data */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, test_pattern2, strlen(test_pattern2));
assert(ringbuf_memcpy_from(dst, rb1, 3) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - (strlen(test_pattern2) - 3));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern2) - 3);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 3);
assert(ringbuf_head(rb1) == (uint8_t *) ringbuf_tail(rb1) + (strlen(test_pattern2) - 3));
assert(strncmp((const char *) dst, test_pattern2, 3) == 0);
assert(strncmp((const char *) dst + 3, (const char *) buf + 3, RINGBUF_SIZE * 2 - 3) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from full capacity */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, RINGBUF_SIZE - 1);
assert(ringbuf_memcpy_from(dst, rb1, RINGBUF_SIZE - 1) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_head(rb1) == rb1_base + RINGBUF_SIZE - 1);
assert(strncmp((const char *) dst, (const char *) buf2, RINGBUF_SIZE - 1) == 0);
assert(strncmp((const char *) dst + RINGBUF_SIZE - 1, (const char *) buf + RINGBUF_SIZE - 1, RINGBUF_SIZE + 1) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from, twice */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 13);
assert(ringbuf_memcpy_from(dst, rb1, 9) == ringbuf_tail(rb1));
assert(ringbuf_memcpy_from((uint8_t *) dst + 9, rb1, 4) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 13);
assert(strncmp((const char *) dst, (const char *) buf2, 13) == 0);
assert(strncmp((const char *) dst + 13, (const char *) buf + 13, RINGBUF_SIZE * 2 - 13) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from, twice (full capacity) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, RINGBUF_SIZE - 1);
assert(ringbuf_memcpy_from(dst, rb1, RINGBUF_SIZE - 2) == ringbuf_tail(rb1));
assert(ringbuf_memcpy_from(dst + RINGBUF_SIZE - 2, rb1, 1) == ringbuf_tail(rb1));
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base + RINGBUF_SIZE - 1);
assert(strncmp((const char *) dst, (const char *) buf2, RINGBUF_SIZE - 1) == 0);
assert(strncmp((const char *) dst + RINGBUF_SIZE - 1, (const char *) buf + RINGBUF_SIZE - 1, RINGBUF_SIZE * 2 - (RINGBUF_SIZE -1)) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from, attempt to underflow */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 15);
assert(ringbuf_memcpy_from(dst, rb1, 16) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 15);
assert(ringbuf_bytes_used(rb1) == 15);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
assert(ringbuf_head(rb1) == rb1_base + 15);
assert(strncmp((const char *) dst, (const char *) buf, RINGBUF_SIZE * 2) == 0);
END_TEST(test_num);
/* ringbuf_memcpy_from, attempt to underflow on 2nd call */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 15);
assert(ringbuf_memcpy_from(dst, rb1, 14) == ringbuf_tail(rb1));
assert(ringbuf_memcpy_from(dst + 14, rb1, 2) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 1);
assert(ringbuf_bytes_used(rb1) == 1);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 14);
assert(ringbuf_head(rb1) == rb1_base + 15);
assert(strncmp((const char *) dst, (const char *) buf2, 14) == 0);
assert(strncmp((const char *) dst + 14, (const char *) buf + 14, RINGBUF_SIZE * 2 - 14) == 0);
END_TEST(test_num);
wrfd = mkstemps(wr_template, strlen("ringbuf-wr"));
assert(wrfd != -1);
/* ringbuf_write with zero count, empty ring buffer */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(ringbuf_write(wrfd, rb1, 0) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(lseek(wrfd, 0, SEEK_SET) == 0);
/* should return 0 (EOF) */
assert(read(wrfd, dst, 10) == 0);
END_TEST(test_num);
/* ringbuf_write with zero count, non-empty ring buffer */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
ringbuf_memcpy_into(rb1, test_pattern2, strlen(test_pattern2));
assert(ringbuf_write(wrfd, rb1, 0) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - strlen(test_pattern2));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern2));
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
/* should return 0 (EOF) */
assert(read(wrfd, dst, 10) == 0);
END_TEST(test_num);
/* ringbuf_write a few bytes of data */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, test_pattern2, strlen(test_pattern2));
assert(ringbuf_write(wrfd, rb1, 3) == 3);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - (strlen(test_pattern2) - 3));
assert(ringbuf_bytes_used(rb1) == strlen(test_pattern2) - 3);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 3);
assert(ringbuf_head(rb1) == (uint8_t *) ringbuf_tail(rb1) + (strlen(test_pattern2) - 3));
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 4) == 3);
assert(read(wrfd, dst + 3, 1) == 0);
assert(strncmp((const char *) dst, test_pattern2, 3) == 0);
assert(strncmp((const char *) dst + 3, (const char *) buf + 3, RINGBUF_SIZE * 2 - 3) == 0);
END_TEST(test_num);
/* ringbuf_write full capacity */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, RINGBUF_SIZE - 1);
assert(ringbuf_write(wrfd, rb1, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_head(rb1) == rb1_base + RINGBUF_SIZE - 1);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, RINGBUF_SIZE) == RINGBUF_SIZE - 1);
assert(read(wrfd, dst + RINGBUF_SIZE - 1, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf2, RINGBUF_SIZE - 1) == 0);
assert(strncmp((const char *) dst + RINGBUF_SIZE - 1, (const char *) buf + RINGBUF_SIZE - 1, RINGBUF_SIZE + 1) == 0);
END_TEST(test_num);
/* ringbuf_write, twice */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 13);
assert(ringbuf_write(wrfd, rb1, 9) == 9);
assert(ringbuf_write(wrfd, rb1, 4) == 4);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 13);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 14) == 13);
assert(read(wrfd, dst + 13, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf2, 13) == 0);
assert(strncmp((const char *) dst + 13, (const char *) buf + 13, RINGBUF_SIZE * 2 - 13) == 0);
END_TEST(test_num);
/* ringbuf_write, twice (full capacity) */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, RINGBUF_SIZE - 1);
assert(ringbuf_write(wrfd, rb1, RINGBUF_SIZE - 2) == RINGBUF_SIZE - 2);
assert(ringbuf_write(wrfd, rb1, 1) == 1);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == ringbuf_head(rb1));
assert(ringbuf_tail(rb1) == rb1_base + RINGBUF_SIZE - 1);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, RINGBUF_SIZE - 1) == RINGBUF_SIZE - 1);
assert(read(wrfd, dst + RINGBUF_SIZE - 1, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf2, RINGBUF_SIZE - 1) == 0);
assert(strncmp((const char *) dst + RINGBUF_SIZE - 1, (const char *) buf + RINGBUF_SIZE - 1, RINGBUF_SIZE * 2 - (RINGBUF_SIZE -1)) == 0);
END_TEST(test_num);
/* ringbuf_write, attempt to underflow */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 15);
assert(ringbuf_write(wrfd, rb1, 16) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 15);
assert(ringbuf_bytes_used(rb1) == 15);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base);
assert(ringbuf_head(rb1) == rb1_base + 15);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf, RINGBUF_SIZE * 2) == 0);
END_TEST(test_num);
/* ringbuf_write, attempt to underflow on 2nd call */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern);
ringbuf_memcpy_into(rb1, buf2, 15);
assert(ringbuf_write(wrfd, rb1, 14) == 14);
assert(ringbuf_write(wrfd, rb1, 2) == 0);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 1);
assert(ringbuf_bytes_used(rb1) == 1);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(ringbuf_tail(rb1) == rb1_base + 14);
assert(ringbuf_head(rb1) == rb1_base + 15);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 15) == 14);
assert(read(wrfd, dst, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf2, 1) == 0);
assert(strncmp((const char *) dst + 14, (const char *) buf + 14, RINGBUF_SIZE * 2 - 14) == 0);
END_TEST(test_num);
/* ringbuf_read followed by ringbuf_write */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern2);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
assert(ringbuf_read(rdfd, rb1, 11) == 11);
assert(ringbuf_write(wrfd, rb1, 11) == 11);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1));
assert(ringbuf_bytes_used(rb1) == 0);
assert(!ringbuf_is_full(rb1));
assert(ringbuf_is_empty(rb1));
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 11) == 11);
assert(read(wrfd, dst, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf, 11) == 0);
assert(strncmp((const char *) dst + 11, (const char *) buf2 + 11, RINGBUF_SIZE * 2 - 11) == 0);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/* ringbuf_read followed by partial ringbuf_write */
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern2);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
ringbuf_reset(rb1);
assert(ringbuf_read(rdfd, rb1, 11) == 11);
assert(ringbuf_write(wrfd, rb1, 7) == 7);
assert(ringbuf_capacity(rb1) == RINGBUF_SIZE - 1);
assert(ringbuf_bytes_free(rb1) == ringbuf_capacity(rb1) - 4);
assert(ringbuf_bytes_used(rb1) == 4);
assert(!ringbuf_is_full(rb1));
assert(!ringbuf_is_empty(rb1));
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(read(wrfd, dst, 11) == 7);
assert(read(wrfd, dst, 1) == 0);
assert(strncmp((const char *) dst, (const char *) buf, 7) == 0);
assert(strncmp((const char *) dst + 7, (const char *) buf2 + 7, RINGBUF_SIZE * 2 - 7) == 0);
assert(ringbuf_tail(rb1) == rb1_base + 7);
assert(ringbuf_head(rb1) == rb1_base + 11);
assert(*(char *)ringbuf_head(rb1) == '\1');
END_TEST(test_num);
/*
* ringbuf_read, ringbuf_write, then ringbuf_read to just before
* the end of contiguous buffer, but don't wrap
*/
START_NEW_TEST(test_num);
ringbuf_reset(rb1);
ringbuf_memset(rb1, 1, ringbuf_buffer_size(rb1));
ringbuf_reset(rb1);
fill_buffer(dst, RINGBUF_SIZE * 2, test_pattern2);
assert(ftruncate(wrfd, 0) == 0);
assert(lseek(wrfd, 0, SEEK_SET) == 0);
assert(lseek(rdfd, 0, SEEK_SET) == 0);
assert(ringbuf_read(rdfd, rb1, 11) == 11);