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/**
* SPDX-License-Identifier: GPL-2.0 only
*
* Copyright (c) 2025 Sandisk Corporation or its affiliates.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "../unittest.h"
#include "pcbuf.h"
#define TEST_CAPACITY 8 /* Small capacity for wrap-around testing */
static void test_pcbuf_basic_ops(void)
{
struct pc_buf *cb = pcb_alloc(TEST_CAPACITY);
uint64_t i;
CU_ASSERT_PTR_NOT_NULL(cb);
CU_ASSERT_TRUE(pcb_is_empty(cb));
CU_ASSERT_FALSE(pcb_is_full(cb));
CU_ASSERT_EQUAL(pcb_committed_size(cb), 0);
CU_ASSERT_EQUAL(pcb_staged_size(cb), 0);
CU_ASSERT_TRUE(pcb_space_available(cb));
/* Stage data up to capacity-1 (since 1 slot is reserved) */
for (i = 0; i < TEST_CAPACITY - 1; ++i) {
CU_ASSERT_TRUE(pcb_push_staged(cb, i + 100));
}
/* Next push should fail (buffer full) */
CU_ASSERT_FALSE(pcb_push_staged(cb, 999));
CU_ASSERT_EQUAL(pcb_staged_size(cb), TEST_CAPACITY - 1);
CU_ASSERT_EQUAL(pcb_committed_size(cb), 0);
CU_ASSERT_TRUE(pcb_is_empty(cb));
CU_ASSERT_TRUE(pcb_is_full(cb));
/* Commit staged data */
pcb_commit(cb);
CU_ASSERT_EQUAL(pcb_committed_size(cb), TEST_CAPACITY - 1);
CU_ASSERT_EQUAL(pcb_staged_size(cb), 0);
CU_ASSERT_FALSE(pcb_is_empty(cb));
/* Pop all committed data */
for (i = 0; i < TEST_CAPACITY - 1; ++i) {
uint64_t val;
CU_ASSERT_TRUE(pcb_pop(cb, &val));
CU_ASSERT_EQUAL(val, i + 100);
}
/* Buffer should now be empty again */
CU_ASSERT_TRUE(pcb_is_empty(cb));
CU_ASSERT_FALSE(pcb_is_full(cb));
CU_ASSERT_TRUE(pcb_space_available(cb));
free(cb);
}
static void test_pcbuf_wraparound(void)
{
struct pc_buf *cb = pcb_alloc(TEST_CAPACITY);
uint64_t expected[] = {201, 202, 203, 204, 205, 999};
size_t num_expected = sizeof(expected)/sizeof(expected[0]);
uint64_t val;
uint64_t i;
CU_ASSERT_PTR_NOT_NULL(cb);
/* Stage up to near capacity and commit */
for (i = 0; i < TEST_CAPACITY - 2; ++i)
CU_ASSERT_TRUE(pcb_push_staged(cb, i + 200));
pcb_commit(cb);
/* Pop one item to move read_tail forward */
CU_ASSERT_TRUE(pcb_pop(cb, &val));
CU_ASSERT_EQUAL(val, 200);
/* Now stage one more item to cause wraparound */
CU_ASSERT_TRUE(pcb_push_staged(cb, 999));
pcb_commit(cb);
/* Pop remaining items, ensure correctness */
for (i = 0; i < num_expected; ++i) {
CU_ASSERT_TRUE(pcb_pop(cb, &val));
CU_ASSERT_EQUAL(val, expected[i]);
}
CU_ASSERT_TRUE(pcb_is_empty(cb));
free(cb);
}
static struct fio_unittest_entry tests[] = {
{
.name = "pcbuf/basic_ops",
.fn = test_pcbuf_basic_ops,
},
{
.name = "pcbuf/wraparound",
.fn = test_pcbuf_wraparound,
},
{
.name = NULL,
},
};
CU_ErrorCode fio_unittest_lib_pcbuf(void)
{
return fio_unittest_add_suite("pcbuf.h", NULL, NULL, tests);
}
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