libakstdlib/tests/test_convert.c

/*
 * String -> number wrappers: aksl_atoi / atol / atoll / atof.
 *
 * TODO.md section 1.4. This file covers the parts of the contract that are
 * stable today: the happy paths (including negatives and leading whitespace)
 * and the NULL guards.
 *
 * It deliberately says nothing about non-numeric input, trailing junk or
 * overflow. Those all return *success* today (TODO.md 2.1.5) and the correct
 * behaviour is asserted by tests/test_convert_strict.c, which is registered as
 * a known failure. Pinning the current lax behaviour here as well would mean
 * this file starts failing on the day the defect is fixed.
 */

#include "aksl_capture.h"

static int test_atoi_converts_positive(void)
{
    int out = -1;

    AKSL_CHECK_OK(aksl_atoi("1234", &out));
    AKSL_CHECK(out == 1234);
    return 0;
}

static int test_atoi_converts_negative(void)
{
    int out = 0;

    AKSL_CHECK_OK(aksl_atoi("-42", &out));
    AKSL_CHECK(out == -42);
    return 0;
}

static int test_atoi_skips_leading_whitespace(void)
{
    int out = 0;

    AKSL_CHECK_OK(aksl_atoi("   \t 7", &out));
    AKSL_CHECK(out == 7);
    return 0;
}

static int test_atoi_rejects_null_arguments(void)
{
    int out = 0;

    AKSL_CHECK_STATUS_MSG_CONTAINS(aksl_atoi(NULL, &out),
                                   AKERR_NULLPOINTER, "nptr=");
    AKSL_CHECK_STATUS_MSG_CONTAINS(aksl_atoi("1", NULL),
                                   AKERR_NULLPOINTER, "dest=");
    return 0;
}

static int test_atol_converts_and_rejects_null(void)
{
    long out = 0;

    AKSL_CHECK_OK(aksl_atol("2147483648", &out));
    AKSL_CHECK(out == 2147483648L);
    AKSL_CHECK_OK(aksl_atol("-2147483648", &out));
    AKSL_CHECK(out == -2147483648L);

    AKSL_CHECK_STATUS(aksl_atol(NULL, &out), AKERR_NULLPOINTER);
    AKSL_CHECK_STATUS(aksl_atol("1", NULL), AKERR_NULLPOINTER);
    return 0;
}

static int test_atoll_converts_and_rejects_null(void)
{
    long long out = 0;

    AKSL_CHECK_OK(aksl_atoll("9007199254740993", &out));
    AKSL_CHECK(out == 9007199254740993LL);
    AKSL_CHECK_OK(aksl_atoll("-9007199254740993", &out));
    AKSL_CHECK(out == -9007199254740993LL);

    AKSL_CHECK_STATUS(aksl_atoll(NULL, &out), AKERR_NULLPOINTER);
    AKSL_CHECK_STATUS(aksl_atoll("1", NULL), AKERR_NULLPOINTER);
    return 0;
}

static int test_atof_converts_and_rejects_null(void)
{
    double out = 0.0;

    AKSL_CHECK_OK(aksl_atof("2.5", &out));
    AKSL_CHECK(out == 2.5);
    AKSL_CHECK_OK(aksl_atof("  -0.125", &out));
    AKSL_CHECK(out == -0.125);

    AKSL_CHECK_STATUS(aksl_atof(NULL, &out), AKERR_NULLPOINTER);
    AKSL_CHECK_STATUS(aksl_atof("1", NULL), AKERR_NULLPOINTER);
    return 0;
}

/* The wrappers hold no state: the same input converts the same way twice. */
static int test_conversions_are_repeatable(void)
{
    int first = 0;
    int second = 0;

    AKSL_CHECK_OK(aksl_atoi("321", &first));
    AKSL_CHECK_OK(aksl_atoi("321", &second));
    AKSL_CHECK(first == second);
    AKSL_CHECK(first == 321);
    return 0;
}

int main(void)
{
    int failures = 0;

    akerr_init();

    AKSL_RUN(failures, test_atoi_converts_positive);
    AKSL_RUN(failures, test_atoi_converts_negative);
    AKSL_RUN(failures, test_atoi_skips_leading_whitespace);
    AKSL_RUN(failures, test_atoi_rejects_null_arguments);

    AKSL_RUN(failures, test_atol_converts_and_rejects_null);
    AKSL_RUN(failures, test_atoll_converts_and_rejects_null);
    AKSL_RUN(failures, test_atof_converts_and_rejects_null);

    AKSL_RUN(failures, test_conversions_are_repeatable);

    AKSL_REPORT(failures);
}