tests/suites/host_test.function

#line 2 "suites/host_test.function"

/**
 * \brief       Verifies that string is in string parameter format i.e. "<str>"
 *              It also strips enclosing '"' from the input string.
 *
 * \param str   String parameter.
 *
 * \return      0 if success else 1
 */
int verify_string(char **str)
{
    if ((*str)[0] != '"' ||
        (*str)[strlen(*str) - 1] != '"') {
        mbedtls_fprintf(stderr,
                        "Expected string (with \"\") for parameter and got: %s\n", *str);
        return -1;
    }

    (*str)++;
    (*str)[strlen(*str) - 1] = '\0';

    return 0;
}

/**
 * \brief       Verifies that string is an integer. Also gives the converted
 *              integer value.
 *
 * \param str   Input string.
 * \param p_value Pointer to output value.
 *
 * \return      0 if success else 1
 */
int verify_int(char *str, intmax_t *p_value)
{
    char *end = NULL;
    errno = 0;
    /* Limit the range to long: for large integers, the test framework will
     * use expressions anyway. */
    long value = strtol(str, &end, 0);
    if (errno == EINVAL || *end != '\0') {
        mbedtls_fprintf(stderr,
                        "Expected integer for parameter and got: %s\n", str);
        return KEY_VALUE_MAPPING_NOT_FOUND;
    }
    if (errno == ERANGE) {
        mbedtls_fprintf(stderr, "Integer out of range: %s\n", str);
        return KEY_VALUE_MAPPING_NOT_FOUND;
    }
    *p_value = value;
    return 0;
}


/**
 * \brief       Usage string.
 *
 */
#define USAGE \
    "Usage: %s [OPTIONS] files...\n\n" \
    "   Command line arguments:\n" \
    "     files...          One or more test data files. If no file is\n" \
    "                       specified the following default test case\n" \
    "                       file is used:\n" \
    "                           %s\n\n" \
    "   Options:\n" \
    "     -v | --verbose    Display full information about each test\n" \
    "     -h | --help       Display this information\n\n", \
    argv[0], \
    "TESTCASE_FILENAME"


/**
 * \brief       Read a line from the passed file pointer.
 *
 * \param f     FILE pointer
 * \param buf   Pointer to memory to hold read line.
 * \param len   Length of the buf.
 *
 * \return      0 if success else -1
 */
int get_line(FILE *f, char *buf, size_t len)
{
    char *ret;
    int i = 0, str_len = 0, has_string = 0;

    /* Read until we get a valid line */
    do {
        ret = fgets(buf, len, f);
        if (ret == NULL) {
            return -1;
        }

        str_len = strlen(buf);

        /* Skip empty line and comment */
        if (str_len == 0 || buf[0] == '#') {
            continue;
        }
        has_string = 0;
        for (i = 0; i < str_len; i++) {
            char c = buf[i];
            if (c != ' ' && c != '\t' && c != '\n' &&
                c != '\v' && c != '\f' && c != '\r') {
                has_string = 1;
                break;
            }
        }
    } while (!has_string);

    /* Strip new line and carriage return */
    ret = buf + strlen(buf);
    if (ret-- > buf && *ret == '\n') {
        *ret = '\0';
    }
    if (ret-- > buf && *ret == '\r') {
        *ret = '\0';
    }

    return 0;
}

/**
 * \brief       Splits string delimited by ':'. Ignores '\:'.
 *
 * \param buf           Input string
 * \param len           Input string length
 * \param params        Out params found
 * \param params_len    Out params array len
 *
 * \return      Count of strings found.
 */
static int parse_arguments(char *buf, size_t len, char **params,
                           size_t params_len)
{
    size_t cnt = 0, i;
    char *cur = buf;
    char *p = buf, *q;

    params[cnt++] = cur;

    while (*p != '\0' && p < (buf + len)) {
        if (*p == '\\') {
            p++;
            p++;
            continue;
        }
        if (*p == ':') {
            if (p + 1 < buf + len) {
                cur = p + 1;
                TEST_HELPER_ASSERT(cnt < params_len);
                params[cnt++] = cur;
            }
            *p = '\0';
        }

        p++;
    }

    /* Replace backslash escapes in strings */
    for (i = 0; i < cnt; i++) {
        p = params[i];
        q = params[i];

        while (*p != '\0') {
            if (*p == '\\') {
                ++p;
                switch (*p) {
                    case 'n':
                        *p = '\n';
                        break;
                    default:
                        // Fall through to copying *p
                        break;
                }
            }
            *(q++) = *(p++);
        }
        *q = '\0';
    }

    return cnt;
}

/**
 * \brief       Converts parameters into test function consumable parameters.
 *              Example: Input:  {"int", "0", "char*", "Hello",
 *                                "hex", "abef", "exp", "1"}
 *                      Output:  {
 *                                0,                // Verified int
 *                                "Hello",          // Verified string
 *                                2, { 0xab, 0xef },// Converted len,hex pair
 *                                9600              // Evaluated expression
 *                               }
 *
 *
 * \param cnt               Parameter array count.
 * \param params            Out array of found parameters.
 * \param int_params_store  Memory for storing processed integer parameters.
 *
 * \return      0 for success else 1
 */
static int convert_params(size_t cnt, char **params,
                          mbedtls_test_argument_t *int_params_store)
{
    char **cur = params;
    char **out = params;
    int ret = DISPATCH_TEST_SUCCESS;

    while (cur < params + cnt) {
        char *type = *cur++;
        char *val = *cur++;

        if (strcmp(type, "char*") == 0) {
            if (verify_string(&val) == 0) {
                *out++ = val;
            } else {
                ret = (DISPATCH_INVALID_TEST_DATA);
                break;
            }
        } else if (strcmp(type, "int") == 0) {
            if (verify_int(val, &int_params_store->sint) == 0) {
                *out++ = (char *) int_params_store++;
            } else {
                ret = (DISPATCH_INVALID_TEST_DATA);
                break;
            }
        } else if (strcmp(type, "hex") == 0) {
            if (verify_string(&val) == 0) {
                size_t len;

                TEST_HELPER_ASSERT(
                    mbedtls_test_unhexify((unsigned char *) val, strlen(val),
                                          val, &len) == 0);

                int_params_store->len = len;
                *out++ = val;
                *out++ = (char *) (int_params_store++);
            } else {
                ret = (DISPATCH_INVALID_TEST_DATA);
                break;
            }
        } else if (strcmp(type, "exp") == 0) {
            int exp_id = strtol(val, NULL, 10);
            if (get_expression(exp_id, &int_params_store->sint) == 0) {
                *out++ = (char *) int_params_store++;
            } else {
                ret = (DISPATCH_INVALID_TEST_DATA);
                break;
            }
        } else {
            ret = (DISPATCH_INVALID_TEST_DATA);
            break;
        }
    }
    return ret;
}

/**
 * \brief       Tests snprintf implementation with test input.
 *
 * \note
 * At high optimization levels (e.g. gcc -O3), this function may be
 * inlined in run_test_snprintf. This can trigger a spurious warning about
 * potential misuse of snprintf from gcc -Wformat-truncation (observed with
 * gcc 7.2). This warning makes tests in run_test_snprintf redundant on gcc
 * only. They are still valid for other compilers. Avoid this warning by
 * forbidding inlining of this function by gcc.
 *
 * \param n         Buffer test length.
 * \param ref_buf   Expected buffer.
 * \param ref_ret   Expected snprintf return value.
 *
 * \return      0 for success else 1
 */
#if defined(__GNUC__)
__attribute__((__noinline__))
#endif
static int test_snprintf(size_t n, const char *ref_buf, int ref_ret)
{
    int ret;
    char buf[10] = "xxxxxxxxx";
    const char ref[10] = "xxxxxxxxx";

    if (n >= sizeof(buf)) {
        return -1;
    }
    ret = mbedtls_snprintf(buf, n, "%s", "123");
    if (ret < 0 || (size_t) ret >= n) {
        ret = -1;
    }

    if (strncmp(ref_buf, buf, sizeof(buf)) != 0 ||
        ref_ret != ret ||
        memcmp(buf + n, ref + n, sizeof(buf) - n) != 0) {
        return 1;
    }

    return 0;
}

/**
 * \brief       Tests snprintf implementation.
 *
 * \return      0 for success else 1
 */
static int run_test_snprintf(void)
{
    return test_snprintf(0, "xxxxxxxxx",  -1) != 0 ||
           test_snprintf(1, "",           -1) != 0 ||
           test_snprintf(2, "1",          -1) != 0 ||
           test_snprintf(3, "12",         -1) != 0 ||
           test_snprintf(4, "123",         3) != 0 ||
           test_snprintf(5, "123",         3) != 0;
}

/** \brief Write the description of the test case to the outcome CSV file.
 *
 * \param outcome_file  The file to write to.
 *                      If this is \c NULL, this function does nothing.
 * \param argv0         The test suite name.
 * \param test_case     The test case description.
 */
static void write_outcome_entry(FILE *outcome_file,
                                const char *argv0,
                                const char *test_case)
{
    /* The non-varying fields are initialized on first use. */
    static const char *platform = NULL;
    static const char *configuration = NULL;
    static const char *test_suite = NULL;

    if (outcome_file == NULL) {
        return;
    }

    if (platform == NULL) {
        platform = getenv("MBEDTLS_TEST_PLATFORM");
        if (platform == NULL) {
            platform = "unknown";
        }
    }
    if (configuration == NULL) {
        configuration = getenv("MBEDTLS_TEST_CONFIGURATION");
        if (configuration == NULL) {
            configuration = "unknown";
        }
    }
    if (test_suite == NULL) {
        test_suite = strrchr(argv0, '/');
        if (test_suite != NULL) {
            test_suite += 1; // skip the '/'
        } else {
            test_suite = argv0;
        }
    }

    /* Write the beginning of the outcome line.
     * Ignore errors: writing the outcome file is on a best-effort basis. */
    mbedtls_fprintf(outcome_file, "%s;%s;%s;%s;",
                    platform, configuration, test_suite, test_case);
}

/** \brief Write the result of the test case to the outcome CSV file.
 *
 * \param outcome_file  The file to write to.
 *                      If this is \c NULL, this function does nothing.
 * \param unmet_dep_count            The number of unmet dependencies.
 * \param unmet_dependencies         The array of unmet dependencies.
 * \param missing_unmet_dependencies Non-zero if there was a problem tracking
 *                                   all unmet dependencies, 0 otherwise.
 * \param ret                        The test dispatch status (DISPATCH_xxx).
 * \param info                       A pointer to the test info structure.
 */
static void write_outcome_result(FILE *outcome_file,
                                 size_t unmet_dep_count,
                                 int unmet_dependencies[],
                                 int missing_unmet_dependencies,
                                 int ret,
                                 const mbedtls_test_info_t *info)
{
    if (outcome_file == NULL) {
        return;
    }

    /* Write the end of the outcome line.
     * Ignore errors: writing the outcome file is on a best-effort basis. */
    switch (ret) {
        case DISPATCH_TEST_SUCCESS:
            if (unmet_dep_count > 0) {
                size_t i;
                mbedtls_fprintf(outcome_file, "SKIP");
                for (i = 0; i < unmet_dep_count; i++) {
                    mbedtls_fprintf(outcome_file, "%c%d",
                                    i == 0 ? ';' : ':',
                                    unmet_dependencies[i]);
                }
                if (missing_unmet_dependencies) {
                    mbedtls_fprintf(outcome_file, ":...");
                }
                break;
            }
            switch (info->result) {
                case MBEDTLS_TEST_RESULT_SUCCESS:
                    mbedtls_fprintf(outcome_file, "PASS;");
                    break;
                case MBEDTLS_TEST_RESULT_SKIPPED:
                    mbedtls_fprintf(outcome_file, "SKIP;Runtime skip");
                    break;
                default:
                    mbedtls_fprintf(outcome_file, "FAIL;%s:%d:%s",
                                    info->filename, info->line_no,
                                    info->test);
                    break;
            }
            break;
        case DISPATCH_TEST_FN_NOT_FOUND:
            mbedtls_fprintf(outcome_file, "FAIL;Test function not found");
            break;
        case DISPATCH_INVALID_TEST_DATA:
            mbedtls_fprintf(outcome_file, "FAIL;Invalid test data");
            break;
        case DISPATCH_UNSUPPORTED_SUITE:
            mbedtls_fprintf(outcome_file, "SKIP;Unsupported suite");
            break;
        default:
            mbedtls_fprintf(outcome_file, "FAIL;Unknown cause");
            break;
    }
    mbedtls_fprintf(outcome_file, "\n");
    fflush(outcome_file);
}

#if defined(__unix__) ||                                \
    (defined(__APPLE__) && defined(__MACH__))
#define MBEDTLS_HAVE_CHDIR
#endif

#if defined(MBEDTLS_HAVE_CHDIR)
/** Try chdir to the directory containing argv0.
 *
 * Failures are silent.
 */
static void try_chdir_if_supported(const char *argv0)
{
    /* We might want to allow backslash as well, for Windows. But then we also
     * need to consider chdir() vs _chdir(), and different conventions
     * regarding paths in argv[0] (naively enabling this code with
     * backslash support on Windows leads to chdir into the wrong directory
     * on the CI). */
    const char *slash = strrchr(argv0, '/');
    if (slash == NULL) {
        return;
    }
    size_t path_size = slash - argv0 + 1;
    char *path = mbedtls_calloc(1, path_size);
    if (path == NULL) {
        return;
    }
    memcpy(path, argv0, path_size - 1);
    path[path_size - 1] = 0;
    int ret = chdir(path);
    if (ret != 0) {
        mbedtls_fprintf(stderr, "%s: note: chdir(\"%s\") failed.\n",
                        __func__, path);
    }
    mbedtls_free(path);
}
#else /* MBEDTLS_HAVE_CHDIR */
/* No chdir() or no support for parsing argv[0] on this platform. */
static void try_chdir_if_supported(const char *argv0)
{
    (void) argv0;
    return;
}
#endif /* MBEDTLS_HAVE_CHDIR */

/**
 * \brief       Desktop implementation of execute_tests().
 *              Parses command line and executes tests from
 *              supplied or default data file.
 *
 * \param argc  Command line argument count.
 * \param argv  Argument array.
 *
 * \return      Program exit status.
 */
int execute_tests(int argc, const char **argv)
{
    /* Local Configurations and options */
    const char *default_filename = "DATA_FILE";
    const char *test_filename = NULL;
    const char **test_files = NULL;
    size_t testfile_count = 0;
    int option_verbose = 0;
    size_t function_id = 0;

    /* Other Local variables */
    int arg_index = 1;
    const char *next_arg;
    size_t testfile_index, i, cnt;
    int ret;
    unsigned total_errors = 0, total_tests = 0, total_skipped = 0;
    FILE *file;
    char buf[5000];
    char *params[50];
    /* Store for processed integer params. */
    mbedtls_test_argument_t int_params[50];
    void *pointer;
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
    int stdout_fd = -1;
#endif /* __unix__ || __APPLE__ __MACH__ */
    const char *outcome_file_name = getenv("MBEDTLS_TEST_OUTCOME_FILE");
    FILE *outcome_file = NULL;

#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && \
    !defined(TEST_SUITE_MEMORY_BUFFER_ALLOC)
    unsigned char alloc_buf[1000000];
    mbedtls_memory_buffer_alloc_init(alloc_buf, sizeof(alloc_buf));
#endif

#if defined(MBEDTLS_TEST_MUTEX_USAGE)
    mbedtls_test_mutex_usage_init();
#endif

    /*
     * The C standard doesn't guarantee that all-bits-0 is the representation
     * of a NULL pointer. We do however use that in our code for initializing
     * structures, which should work on every modern platform. Let's be sure.
     */
    memset(&pointer, 0, sizeof(void *));
    if (pointer != NULL) {
        mbedtls_fprintf(stderr, "all-bits-zero is not a NULL pointer\n");
        return 1;
    }

    /*
     * Make sure we have a snprintf that correctly zero-terminates
     */
    if (run_test_snprintf() != 0) {
        mbedtls_fprintf(stderr, "the snprintf implementation is broken\n");
        return 1;
    }

    if (outcome_file_name != NULL && *outcome_file_name != '\0') {
        outcome_file = fopen(outcome_file_name, "a");
        if (outcome_file == NULL) {
            mbedtls_fprintf(stderr, "Unable to open outcome file. Continuing anyway.\n");
        }
    }

    while (arg_index < argc) {
        next_arg = argv[arg_index];

        if (strcmp(next_arg, "--verbose") == 0 ||
            strcmp(next_arg, "-v") == 0) {
            option_verbose = 1;
        } else if (strcmp(next_arg, "--help") == 0 ||
                   strcmp(next_arg, "-h") == 0) {
            mbedtls_fprintf(stdout, USAGE);
            mbedtls_exit(EXIT_SUCCESS);
        } else {
            /* Not an option, therefore treat all further arguments as the file
             * list.
             */
            test_files = &argv[arg_index];
            testfile_count = argc - arg_index;
            break;
        }

        arg_index++;
    }

    /* If no files were specified, assume a default */
    if (test_files == NULL || testfile_count == 0) {
        test_files = &default_filename;
        testfile_count = 1;
    }

    /* Initialize the struct that holds information about the last test */
    mbedtls_test_info_reset();

    /* Now begin to execute the tests in the testfiles */
    for (testfile_index = 0;
         testfile_index < testfile_count;
         testfile_index++) {
        size_t unmet_dep_count = 0;
        int unmet_dependencies[20];
        int missing_unmet_dependencies = 0;

        test_filename = test_files[testfile_index];

        file = fopen(test_filename, "r");
        if (file == NULL) {
            mbedtls_fprintf(stderr, "Failed to open test file: %s\n",
                            test_filename);
            if (outcome_file != NULL) {
                fclose(outcome_file);
            }
            return 1;
        }

        while (!feof(file)) {
            if (unmet_dep_count > 0) {
                mbedtls_fprintf(stderr,
                                "FATAL: Dep count larger than zero at start of loop\n");
                mbedtls_exit(MBEDTLS_EXIT_FAILURE);
            }
            unmet_dep_count = 0;
            missing_unmet_dependencies = 0;

            if ((ret = get_line(file, buf, sizeof(buf))) != 0) {
                break;
            }
            mbedtls_fprintf(stdout, "%s%.66s",
                            mbedtls_test_info.result == MBEDTLS_TEST_RESULT_FAILED ?
                            "\n" : "", buf);
            mbedtls_fprintf(stdout, " ");
            for (i = strlen(buf) + 1; i < 67; i++) {
                mbedtls_fprintf(stdout, ".");
            }
            mbedtls_fprintf(stdout, " ");
            fflush(stdout);
            write_outcome_entry(outcome_file, argv[0], buf);

            total_tests++;

            if ((ret = get_line(file, buf, sizeof(buf))) != 0) {
                break;
            }
            cnt = parse_arguments(buf, strlen(buf), params,
                                  sizeof(params) / sizeof(params[0]));

            if (strcmp(params[0], "depends_on") == 0) {
                for (i = 1; i < cnt; i++) {
                    int dep_id = strtol(params[i], NULL, 10);
                    if (dep_check(dep_id) != DEPENDENCY_SUPPORTED) {
                        if (unmet_dep_count <
                            ARRAY_LENGTH(unmet_dependencies)) {
                            unmet_dependencies[unmet_dep_count] = dep_id;
                            unmet_dep_count++;
                        } else {
                            missing_unmet_dependencies = 1;
                        }
                    }
                }

                if ((ret = get_line(file, buf, sizeof(buf))) != 0) {
                    break;
                }
                cnt = parse_arguments(buf, strlen(buf), params,
                                      sizeof(params) / sizeof(params[0]));
            }

            // If there are no unmet dependencies execute the test
            if (unmet_dep_count == 0) {
                mbedtls_test_info_reset();

#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
                /* Suppress all output from the library unless we're verbose
                 * mode
                 */
                if (!option_verbose) {
                    stdout_fd = redirect_output(stdout, "/dev/null");
                    if (stdout_fd == -1) {
                        /* Redirection has failed with no stdout so exit */
                        exit(1);
                    }
                }
#endif /* __unix__ || __APPLE__ __MACH__ */

                function_id = strtoul(params[0], NULL, 10);
                if ((ret = check_test(function_id)) == DISPATCH_TEST_SUCCESS) {
                    ret = convert_params(cnt - 1, params + 1, int_params);
                    if (DISPATCH_TEST_SUCCESS == ret) {
                        ret = dispatch_test(function_id, (void **) (params + 1));
                    }
                }

#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
                if (!option_verbose && restore_output(stdout, stdout_fd)) {
                    /* Redirection has failed with no stdout so exit */
                    exit(1);
                }
#endif /* __unix__ || __APPLE__ __MACH__ */

            }

            write_outcome_result(outcome_file,
                                 unmet_dep_count, unmet_dependencies,
                                 missing_unmet_dependencies,
                                 ret, &mbedtls_test_info);
            if (unmet_dep_count > 0 || ret == DISPATCH_UNSUPPORTED_SUITE) {
                total_skipped++;
                mbedtls_fprintf(stdout, "----");

                if (1 == option_verbose && ret == DISPATCH_UNSUPPORTED_SUITE) {
                    mbedtls_fprintf(stdout, "\n   Test Suite not enabled");
                }

                if (1 == option_verbose && unmet_dep_count > 0) {
                    mbedtls_fprintf(stdout, "\n   Unmet dependencies: ");
                    for (i = 0; i < unmet_dep_count; i++) {
                        mbedtls_fprintf(stdout, "%d ",
                                        unmet_dependencies[i]);
                    }
                    if (missing_unmet_dependencies) {
                        mbedtls_fprintf(stdout, "...");
                    }
                }
                mbedtls_fprintf(stdout, "\n");
                fflush(stdout);

                unmet_dep_count = 0;
                missing_unmet_dependencies = 0;
            } else if (ret == DISPATCH_TEST_SUCCESS) {
                if (mbedtls_test_info.result == MBEDTLS_TEST_RESULT_SUCCESS) {
                    mbedtls_fprintf(stdout, "PASS\n");
                } else if (mbedtls_test_info.result == MBEDTLS_TEST_RESULT_SKIPPED) {
                    mbedtls_fprintf(stdout, "----\n");
                    total_skipped++;
                } else {
                    total_errors++;
                    mbedtls_fprintf(stdout, "FAILED\n");
                    mbedtls_fprintf(stdout, "  %s\n  at ",
                                    mbedtls_test_info.test);
                    if (mbedtls_test_info.step != (unsigned long) (-1)) {
                        mbedtls_fprintf(stdout, "step %lu, ",
                                        mbedtls_test_info.step);
                    }
                    mbedtls_fprintf(stdout, "line %d, %s",
                                    mbedtls_test_info.line_no,
                                    mbedtls_test_info.filename);
                    if (mbedtls_test_info.line1[0] != 0) {
                        mbedtls_fprintf(stdout, "\n  %s",
                                        mbedtls_test_info.line1);
                    }
                    if (mbedtls_test_info.line2[0] != 0) {
                        mbedtls_fprintf(stdout, "\n  %s",
                                        mbedtls_test_info.line2);
                    }
                }
                fflush(stdout);
            } else if (ret == DISPATCH_INVALID_TEST_DATA) {
                mbedtls_fprintf(stderr, "FAILED: FATAL PARSE ERROR\n");
                fclose(file);
                mbedtls_exit(2);
            } else if (ret == DISPATCH_TEST_FN_NOT_FOUND) {
                mbedtls_fprintf(stderr, "FAILED: FATAL TEST FUNCTION NOT FOUND\n");
                fclose(file);
                mbedtls_exit(2);
            } else {
                total_errors++;
            }
        }
        fclose(file);
    }

    if (outcome_file != NULL) {
        fclose(outcome_file);
    }

    mbedtls_fprintf(stdout,
                    "\n----------------------------------------------------------------------------\n\n");
    if (total_errors == 0) {
        mbedtls_fprintf(stdout, "PASSED");
    } else {
        mbedtls_fprintf(stdout, "FAILED");
    }

    mbedtls_fprintf(stdout, " (%u / %u tests (%u skipped))\n",
                    total_tests - total_errors, total_tests, total_skipped);

#if defined(MBEDTLS_TEST_MUTEX_USAGE)
    mbedtls_test_mutex_usage_end();
#endif

#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) && \
    !defined(TEST_SUITE_MEMORY_BUFFER_ALLOC)
#if defined(MBEDTLS_MEMORY_DEBUG)
    mbedtls_memory_buffer_alloc_status();
#endif
    mbedtls_memory_buffer_alloc_free();
#endif

    return total_errors != 0;
}