akbasic/tests/convert.c

/**
 * @file convert.c
 * @brief Tests the strict string-to-number converters.
 *
 * These exist because libakstdlib's aksl_ato* family cannot report a conversion
 * failure. Every assertion here is one that family would get wrong.
 */

#include <errno.h>

#include <akbasic/convert.h>
#include <akbasic/error.h>

#include "testutil.h"

int main(void)
{
    int64_t i = 0;
    double d = 0.0;

    TEST_REQUIRE_OK(akbasic_error_register());

    /* Valid decimal, hex and negative. */
    TEST_REQUIRE_OK(akbasic_str_to_int64("1234", 10, &i));
    TEST_REQUIRE_INT(i, 1234);
    TEST_REQUIRE_OK(akbasic_str_to_int64("0xff", 16, &i));
    TEST_REQUIRE_INT(i, 255);
    TEST_REQUIRE_OK(akbasic_str_to_int64("-256", 10, &i));
    TEST_REQUIRE_INT(i, -256);

    /*
     * The whole point: aksl_atoi returns success with 0 for each of these.
     */
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("", 10, &i), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("not a number", 10, &i), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("12abc", 10, &i), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("12 ", 10, &i), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("99999999999999999999999", 10, &i), ERANGE);

    TEST_REQUIRE_STATUS(akbasic_str_to_int64(NULL, 10, &i), AKERR_NULLPOINTER);
    TEST_REQUIRE_STATUS(akbasic_str_to_int64("1", 10, NULL), AKERR_NULLPOINTER);

    /* Floats. */
    TEST_REQUIRE_OK(akbasic_str_to_double("123.456", &d));
    TEST_REQUIRE_FEQ(d, 123.456);
    TEST_REQUIRE_OK(akbasic_str_to_double("-2.5", &d));
    TEST_REQUIRE_FEQ(d, -2.5);
    TEST_REQUIRE_OK(akbasic_str_to_double("32", &d));
    TEST_REQUIRE_FEQ(d, 32.0);

    TEST_REQUIRE_STATUS(akbasic_str_to_double("", &d), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_double("garbage", &d), AKBASIC_ERR_VALUE);
    TEST_REQUIRE_STATUS(akbasic_str_to_double("1.5x", &d), AKBASIC_ERR_VALUE);

    /*
     * errno hygiene. strtoll and strtod do not clear errno on success, so a
     * stale ERANGE left by some earlier call would make a perfectly valid
     * conversion raise. That is what the `errno = 0` before each call is for.
     *
     * Found by mutation testing: deleting that line, or setting errno to
     * something non-zero, survived the suite until these four assertions
     * existed.
     */
    errno = ERANGE;
    TEST_REQUIRE_OK(akbasic_str_to_int64("42", 10, &i));
    TEST_REQUIRE_INT(i, 42);
    errno = ERANGE;
    TEST_REQUIRE_OK(akbasic_str_to_double("2.5", &d));
    TEST_REQUIRE_FEQ(d, 2.5);

    return akbasic_test_failures;
}