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// SPDX-License-Identifier: GPL-2.0
/*
* KUnit tests for the seq_buf API
*
* Copyright (C) 2025, Google LLC.
*/
#include <kunit/test.h>
#include <linux/seq_buf.h>
static void seq_buf_init_test(struct kunit *test)
{
char buf[32];
struct seq_buf s;
seq_buf_init(&s, buf, sizeof(buf));
KUNIT_EXPECT_EQ(test, s.size, 32);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_buffer_left(&s), 32);
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 0);
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_declare_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 24);
KUNIT_EXPECT_EQ(test, s.size, 24);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_buffer_left(&s), 24);
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 0);
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_clear_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 128);
seq_buf_puts(&s, "hello");
KUNIT_EXPECT_EQ(test, s.len, 5);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello");
seq_buf_clear(&s);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_puts_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 16);
seq_buf_puts(&s, "hello");
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 5);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello");
seq_buf_puts(&s, " world");
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 11);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello world");
}
static void seq_buf_puts_overflow_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 10);
seq_buf_puts(&s, "123456789");
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 9);
seq_buf_puts(&s, "0");
KUNIT_EXPECT_TRUE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 10);
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "123456789");
seq_buf_clear(&s);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_putc_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 4);
seq_buf_putc(&s, 'a');
seq_buf_putc(&s, 'b');
seq_buf_putc(&s, 'c');
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 3);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "abc");
seq_buf_putc(&s, 'd');
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 4);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "abc");
seq_buf_putc(&s, 'e');
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 4);
KUNIT_EXPECT_TRUE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "abc");
seq_buf_clear(&s);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_printf_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 32);
seq_buf_printf(&s, "hello %s", "world");
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 11);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello world");
seq_buf_printf(&s, " %d", 123);
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 15);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello world 123");
}
static void seq_buf_printf_overflow_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 16);
seq_buf_printf(&s, "%lu", 1234567890UL);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 10);
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "1234567890");
seq_buf_printf(&s, "%s", "abcdefghij");
KUNIT_EXPECT_TRUE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 16);
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "1234567890abcde");
seq_buf_clear(&s);
KUNIT_EXPECT_EQ(test, s.len, 0);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "");
}
static void seq_buf_get_buf_commit_test(struct kunit *test)
{
DECLARE_SEQ_BUF(s, 16);
char *buf;
size_t len;
len = seq_buf_get_buf(&s, &buf);
KUNIT_EXPECT_EQ(test, len, 16);
KUNIT_EXPECT_PTR_NE(test, buf, NULL);
memcpy(buf, "hello", 5);
seq_buf_commit(&s, 5);
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 5);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello");
len = seq_buf_get_buf(&s, &buf);
KUNIT_EXPECT_EQ(test, len, 11);
KUNIT_EXPECT_PTR_NE(test, buf, NULL);
memcpy(buf, " worlds!", 8);
seq_buf_commit(&s, 6);
KUNIT_EXPECT_EQ(test, seq_buf_used(&s), 11);
KUNIT_EXPECT_FALSE(test, seq_buf_has_overflowed(&s));
KUNIT_EXPECT_STREQ(test, seq_buf_str(&s), "hello world");
len = seq_buf_get_buf(&s, &buf);
KUNIT_EXPECT_EQ(test, len, 5);
KUNIT_EXPECT_PTR_NE(test, buf, NULL);
seq_buf_commit(&s, -1);
KUNIT_EXPECT_TRUE(test, seq_buf_has_overflowed(&s));
}
static struct kunit_case seq_buf_test_cases[] = {
KUNIT_CASE(seq_buf_init_test),
KUNIT_CASE(seq_buf_declare_test),
KUNIT_CASE(seq_buf_clear_test),
KUNIT_CASE(seq_buf_puts_test),
KUNIT_CASE(seq_buf_puts_overflow_test),
KUNIT_CASE(seq_buf_putc_test),
KUNIT_CASE(seq_buf_printf_test),
KUNIT_CASE(seq_buf_printf_overflow_test),
KUNIT_CASE(seq_buf_get_buf_commit_test),
{}
};
static struct kunit_suite seq_buf_test_suite = {
.name = "seq_buf",
.test_cases = seq_buf_test_cases,
};
kunit_test_suite(seq_buf_test_suite);
MODULE_DESCRIPTION("Runtime test cases for seq_buf string API");
MODULE_LICENSE("GPL");
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