mbedtls/tests/suites/test_suite_platform_printf.function

/* BEGIN_HEADER */

/* The printf test functions take a format argument from the test data
 * for several reasons:
 * - For some tests, it makes sense to vary the format.
 * - For all tests, it means we're testing the actual printf function
 *   that parses the format at runtime, and not a compiler optimization.
 *   (It may be useful to add tests that allow compiler optimizations.
 *   There aren't any yet at the time of writing.)
 */

#include "mbedtls/platform.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define NEWLINE_CHAR '\n'
#define SPACE_CHAR ' '
#define DOUBLE_QUOTE_CHAR '"'
#define COLON_CHAR ':'
#define QUESTION_CHAR '?'
#define BACKSLASH_CHAR '\\'
#define LOWERCASE_N_CHAR 'n'
/* END_HEADER */

/* BEGIN_CASE */
void printf_int(char *format, /* any format expecting one int argument, e.g. "%d" */
                int x, char *result)
{
    char *output = NULL;
    const size_t n = strlen(result);

    /* Nominal case: buffer just large enough */
    ASSERT_ALLOC(output, n + 1);
    TEST_EQUAL(n, mbedtls_snprintf(output, n + 1, format, x));
    ASSERT_COMPARE(result, n + 1, output, n + 1);
    mbedtls_free(output);
    output = NULL;

exit:
    mbedtls_free(output);
}
/* END_CASE */

/* BEGIN_CASE */
void printf_long_max(const char *format, /* "%lx" or longer type */
                     long value)
{
    char *expected = NULL;
    char *output = NULL;
    /* 2 hex digits per byte */
    const size_t n = sizeof(value) * 2;

    /* We assume that long has no padding bits! */
    ASSERT_ALLOC(expected, n + 1);
    expected[0] = '7';
    memset(expected + 1, 'f', sizeof(value) * 2 - 1);

    ASSERT_ALLOC(output, n + 1);
    TEST_EQUAL(n, mbedtls_snprintf(output, n + 1, format, value));
    ASSERT_COMPARE(expected, n + 1, output, n + 1);
    mbedtls_free(output);
    output = NULL;

exit:
    mbedtls_free(output);
    mbedtls_free(expected);
}
/* END_CASE */

/* BEGIN_CASE */
void printf_char2(char *format, /* "%c%c" */
                  int arg1, int arg2, char *result)
{
    char *output = NULL;
    const size_t n = strlen(result);

    /* Nominal case: buffer just large enough */
    ASSERT_ALLOC(output, n + 1);
    TEST_EQUAL(n, mbedtls_snprintf(output, n + 1, format, arg1, arg2));
    ASSERT_COMPARE(result, n + 1, output, n + 1);
    mbedtls_free(output);
    output = NULL;

exit:
    mbedtls_free(output);
}
/* END_CASE */