Momentum-Apps/applications/unit_tests/minunit.h

/*
 * Copyright (c) 2012 David Siñuela Pastor, siu.4coders@gmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef MINUNIT_MINUNIT_H
#define MINUNIT_MINUNIT_H

#ifdef __cplusplus
extern "C" {
#endif

#if defined(_WIN32)
#include <Windows.h>
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#define __func__ __FUNCTION__
#endif

#elif defined(__unix__) || defined(__unix) || defined(unix) || \
    (defined(__APPLE__) && defined(__MACH__))

/* Change POSIX C SOURCE version for pure c99 compilers */
#if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif

#include <unistd.h> /* POSIX flags */
#include <time.h> /* clock_gettime(), time() */
#include <sys/time.h> /* gethrtime(), gettimeofday() */
#include <sys/resource.h>
#include <sys/times.h>
#include <string.h>

#if defined(__MACH__) && defined(__APPLE__)
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif

#if __GNUC__ >= 5 && !defined(__STDC_VERSION__)
#define __func__ __extension__ __FUNCTION__
#endif

#else

// #error "Unable to define timers for an unknown OS."

#endif

#include <stdio.h>
#include <math.h>

/*  Maximum length of last message */
#define MINUNIT_MESSAGE_LEN 1024
/*  Accuracy with which floats are compared */
#define MINUNIT_EPSILON 1E-12

#include "minunit_vars_ex.h"

/*  Test setup and teardown function pointers */
__attribute__((unused)) static void (*minunit_setup)(void) = NULL;
__attribute__((unused)) static void (*minunit_teardown)(void) = NULL;

void minunit_print_progress(void);
void minunit_print_fail(const char* error);

/*  Definitions */
#define MU_TEST(method_name) static void method_name(void)
#define MU_TEST_1(method_name, arg_1) static void method_name(arg_1)
#define MU_TEST_SUITE(suite_name) static void suite_name(void)

#define MU__SAFE_BLOCK(block) \
    do {                      \
        block                 \
    } while(0)

/*  Run test suite and unset setup and teardown functions */
#define MU_RUN_SUITE(suite_name) \
    MU__SAFE_BLOCK(suite_name(); minunit_setup = NULL; minunit_teardown = NULL;)

/*  Configure setup and teardown functions */
#define MU_SUITE_CONFIGURE(setup_fun, teardown_fun) \
    MU__SAFE_BLOCK(minunit_setup = setup_fun; minunit_teardown = teardown_fun;)

/*  Test runner */
#define MU_RUN_TEST(test)                                        \
    MU__SAFE_BLOCK(                                              \
        if(minunit_real_timer == 0 && minunit_proc_timer == 0) { \
            minunit_real_timer = mu_timer_real();                \
            minunit_proc_timer = mu_timer_cpu();                 \
        } if(minunit_setup) (*minunit_setup)();                  \
        minunit_status = 0;                                      \
        printf(#test "()\r\n");                                  \
        test();                                                  \
        minunit_run++;                                           \
        if(minunit_status) {                                     \
            minunit_fail++;                                      \
            minunit_print_fail(minunit_last_message);            \
            minunit_status = 0;                                  \
        } fflush(stdout);                                        \
        if(minunit_teardown)(*minunit_teardown)();)

#define MU_RUN_TEST_1(test, arg_1)                               \
    MU__SAFE_BLOCK(                                              \
        if(minunit_real_timer == 0 && minunit_proc_timer == 0) { \
            minunit_real_timer = mu_timer_real();                \
            minunit_proc_timer = mu_timer_cpu();                 \
        } if(minunit_setup) (*minunit_setup)();                  \
        minunit_status = 0;                                      \
        printf(#test "(" #arg_1 ")\r\n");                        \
        test(arg_1);                                             \
        minunit_run++;                                           \
        if(minunit_status) {                                     \
            minunit_fail++;                                      \
            minunit_print_fail(minunit_last_message);            \
            minunit_status = 0;                                  \
        } fflush(stdout);                                        \
        if(minunit_teardown)(*minunit_teardown)();)

/*  Report */
#define MU_REPORT()                                                                      \
    MU__SAFE_BLOCK(double minunit_end_real_timer; double minunit_end_proc_timer; printf( \
                       "\n\n%d tests, %d assertions, %d failures\n",                     \
                       minunit_run,                                                      \
                       minunit_assert,                                                   \
                       minunit_fail);                                                    \
                   minunit_end_real_timer = mu_timer_real();                             \
                   minunit_end_proc_timer = mu_timer_cpu();                              \
                   printf(                                                               \
                       "\nFinished in %.8f seconds (real) %.8f seconds (proc)\n\n",      \
                       minunit_end_real_timer - minunit_real_timer,                      \
                       minunit_end_proc_timer - minunit_proc_timer);)
#define MU_EXIT_CODE minunit_fail

/*  Assertions */
#define mu_check(test)                     \
    MU__SAFE_BLOCK(                        \
        minunit_assert++; if(!(test)) {    \
            snprintf(                      \
                minunit_last_message,      \
                MINUNIT_MESSAGE_LEN,       \
                "%s failed:\n\t%s:%d: %s", \
                __func__,                  \
                __FILE__,                  \
                __LINE__,                  \
                #test);                    \
            minunit_status = 1;            \
            return;                        \
        } else { minunit_print_progress(); })

#define mu_fail(message)                          \
    MU__SAFE_BLOCK(minunit_assert++; snprintf(    \
                       minunit_last_message,      \
                       MINUNIT_MESSAGE_LEN,       \
                       "%s failed:\n\t%s:%d: %s", \
                       __func__,                  \
                       __FILE__,                  \
                       __LINE__,                  \
                       message);                  \
                   minunit_status = 1;            \
                   return;)

#define mu_assert(test, message)           \
    MU__SAFE_BLOCK(                        \
        minunit_assert++; if(!(test)) {    \
            snprintf(                      \
                minunit_last_message,      \
                MINUNIT_MESSAGE_LEN,       \
                "%s failed:\n\t%s:%d: %s", \
                __func__,                  \
                __FILE__,                  \
                __LINE__,                  \
                message);                  \
            minunit_status = 1;            \
            return;                        \
        } else { minunit_print_progress(); })

#define mu_assert_int_eq(expected, result)                                                  \
    MU__SAFE_BLOCK(                                                                         \
        int minunit_tmp_e; int minunit_tmp_r; minunit_assert++; minunit_tmp_e = (expected); \
        minunit_tmp_r = (result);                                                           \
        if(minunit_tmp_e != minunit_tmp_r) {                                                \
            snprintf(                                                                       \
                minunit_last_message,                                                       \
                MINUNIT_MESSAGE_LEN,                                                        \
                "%s failed:\n\t%s:%d: %d expected but was %d",                              \
                __func__,                                                                   \
                __FILE__,                                                                   \
                __LINE__,                                                                   \
                minunit_tmp_e,                                                              \
                minunit_tmp_r);                                                             \
            minunit_status = 1;                                                             \
            return;                                                                         \
        } else { minunit_print_progress(); })

#define mu_assert_int_not_eq(expected, result)                                              \
    MU__SAFE_BLOCK(                                                                         \
        int minunit_tmp_e; int minunit_tmp_r; minunit_assert++; minunit_tmp_e = (expected); \
        minunit_tmp_r = (result);                                                           \
        if(minunit_tmp_e == minunit_tmp_r) {                                                \
            snprintf(                                                                       \
                minunit_last_message,                                                       \
                MINUNIT_MESSAGE_LEN,                                                        \
                "%s failed:\n\t%s:%d: expected different results but both were %d",         \
                __func__,                                                                   \
                __FILE__,                                                                   \
                __LINE__,                                                                   \
                minunit_tmp_e);                                                             \
            minunit_status = 1;                                                             \
            return;                                                                         \
        } else { minunit_print_progress(); })

#define mu_assert_int_greater_than(val, result)                                        \
    MU__SAFE_BLOCK(                                                                    \
        int minunit_tmp_e; int minunit_tmp_r; minunit_assert++; minunit_tmp_e = (val); \
        minunit_tmp_r = (result);                                                      \
        if(val >= minunit_tmp_r) {                                                     \
            snprintf(                                                                  \
                minunit_last_message,                                                  \
                MINUNIT_MESSAGE_LEN,                                                   \
                "%s failed:\n\t%s:%d: %d <= %d",                                       \
                __func__,                                                              \
                __FILE__,                                                              \
                __LINE__,                                                              \
                minunit_tmp_r,                                                         \
                minunit_tmp_e);                                                        \
            minunit_status = 1;                                                        \
            return;                                                                    \
        } else { minunit_print_progress(); })

#define mu_assert_int_less_than(val, result)                                           \
    MU__SAFE_BLOCK(                                                                    \
        int minunit_tmp_e; int minunit_tmp_r; minunit_assert++; minunit_tmp_e = (val); \
        minunit_tmp_r = (result);                                                      \
        if(val <= minunit_tmp_r) {                                                     \
            snprintf(                                                                  \
                minunit_last_message,                                                  \
                MINUNIT_MESSAGE_LEN,                                                   \
                "%s failed:\n\t%s:%d: %d >= %d",                                       \
                __func__,                                                              \
                __FILE__,                                                              \
                __LINE__,                                                              \
                minunit_tmp_r,                                                         \
                minunit_tmp_e);                                                        \
            minunit_status = 1;                                                        \
            return;                                                                    \
        } else { minunit_print_progress(); })

#define mu_assert_int_between(expected_lower, expected_upper, result)              \
    MU__SAFE_BLOCK(                                                                \
        int minunit_tmp_e; int minunit_tmp_m; int minunit_tmp_r; minunit_assert++; \
        minunit_tmp_e = (expected_lower);                                          \
        minunit_tmp_m = (expected_upper);                                          \
        minunit_tmp_r = (result);                                                  \
        if(result < minunit_tmp_e || result > minunit_tmp_m) {                     \
            snprintf(                                                              \
                minunit_last_message,                                              \
                MINUNIT_MESSAGE_LEN,                                               \
                "%s failed:\n\t%s:%d: %d was not between (inclusive) %d and %d",   \
                __func__,                                                          \
                __FILE__,                                                          \
                __LINE__,                                                          \
                minunit_tmp_e,                                                     \
                minunit_tmp_r,                                                     \
                minunit_tmp_m);                                                    \
            minunit_status = 1;                                                    \
            return;                                                                \
        } else { minunit_print_progress(); })

#define mu_assert_int_in(expected, array_length, result)                                 \
    MU__SAFE_BLOCK(                                                                      \
        int minunit_tmp_r; minunit_assert++; minunit_tmp_r = (result); int t = 0; int i; \
        for(i = 0; i < array_length; i++) {                                              \
            if(expected[i] == minunit_tmp_r) t = 1;                                      \
        } if(t == 0) {                                                                   \
            char tmp[500] = {0};                                                         \
            tmp[0] = '[';                                                                \
            for(i = 0; i < array_length; i++) {                                          \
                sprintf(tmp + strlen(tmp), "%d, ", expected[i]);                         \
            }                                                                            \
            int len = strlen(tmp);                                                       \
            tmp[len - 2] = ']';                                                          \
            tmp[len - 1] = '\0';                                                         \
            snprintf(                                                                    \
                minunit_last_message,                                                    \
                MINUNIT_MESSAGE_LEN,                                                     \
                "%s failed:\n\t%s:%d: expected to be one of %s but was %d",              \
                __func__,                                                                \
                __FILE__,                                                                \
                __LINE__,                                                                \
                tmp,                                                                     \
                minunit_tmp_r);                                                          \
            minunit_status = 1;                                                          \
            return;                                                                      \
        } else { minunit_print_progress(); })

#define mu_assert_double_eq(expected, result)                                                     \
    MU__SAFE_BLOCK(                                                                               \
        double minunit_tmp_e; double minunit_tmp_r; minunit_assert++; minunit_tmp_e = (expected); \
        minunit_tmp_r = (result);                                                                 \
        if(fabs(minunit_tmp_e - minunit_tmp_r) > MINUNIT_EPSILON) {                               \
            int minunit_significant_figures = 1 - log10(MINUNIT_EPSILON);                         \
            snprintf(                                                                             \
                minunit_last_message,                                                             \
                MINUNIT_MESSAGE_LEN,                                                              \
                "%s failed:\n\t%s:%d: %.*g expected but was %.*g",                                \
                __func__,                                                                         \
                __FILE__,                                                                         \
                __LINE__,                                                                         \
                minunit_significant_figures,                                                      \
                minunit_tmp_e,                                                                    \
                minunit_significant_figures,                                                      \
                minunit_tmp_r);                                                                   \
            minunit_status = 1;                                                                   \
            return;                                                                               \
        } else { minunit_print_progress(); })

#define mu_assert_double_greater_than(val, result)                                           \
    MU__SAFE_BLOCK(                                                                          \
        double minunit_tmp_e; double minunit_tmp_r; minunit_assert++; minunit_tmp_e = (val); \
        minunit_tmp_r = (result);                                                            \
        if(val >= minunit_tmp_r) {                                                           \
            snprintf(                                                                        \
                minunit_last_message,                                                        \
                MINUNIT_MESSAGE_LEN,                                                         \
                "%s failed:\n\t%s:%d: %f <= %f",                                             \
                __func__,                                                                    \
                __FILE__,                                                                    \
                __LINE__,                                                                    \
                minunit_tmp_r,                                                               \
                minunit_tmp_e);                                                              \
            minunit_status = 1;                                                              \
            return;                                                                          \
        } else { minunit_print_progress(); })

#define mu_assert_double_less_than(val, result)                                              \
    MU__SAFE_BLOCK(                                                                          \
        double minunit_tmp_e; double minunit_tmp_r; minunit_assert++; minunit_tmp_e = (val); \
        minunit_tmp_r = (result);                                                            \
        if(val <= minunit_tmp_r) {                                                           \
            snprintf(                                                                        \
                minunit_last_message,                                                        \
                MINUNIT_MESSAGE_LEN,                                                         \
                "%s failed:\n\t%s:%d: %f >= %f",                                             \
                __func__,                                                                    \
                __FILE__,                                                                    \
                __LINE__,                                                                    \
                minunit_tmp_r,                                                               \
                minunit_tmp_e);                                                              \
            minunit_status = 1;                                                              \
            return;                                                                          \
        } else { minunit_print_progress(); })

#define mu_assert_double_between(expected_lower, expected_upper, result)                    \
    MU__SAFE_BLOCK(                                                                         \
        double minunit_tmp_e; double minunit_tmp_m; double minunit_tmp_r; minunit_assert++; \
        minunit_tmp_e = (expected_lower);                                                   \
        minunit_tmp_m = (expected_upper);                                                   \
        minunit_tmp_r = (result);                                                           \
        if(result < minunit_tmp_e || result > minunit_tmp_m) {                              \
            snprintf(                                                                       \
                minunit_last_message,                                                       \
                MINUNIT_MESSAGE_LEN,                                                        \
                "%s failed:\n\t%s:%d: %f was not between (inclusive) %f and %f",            \
                __func__,                                                                   \
                __FILE__,                                                                   \
                __LINE__,                                                                   \
                minunit_tmp_e,                                                              \
                minunit_tmp_r,                                                              \
                minunit_tmp_m);                                                             \
            minunit_status = 1;                                                             \
            return;                                                                         \
        } else { minunit_print_progress(); })

#define mu_assert_string_eq(expected, result)                                         \
    MU__SAFE_BLOCK(                                                                   \
        const char* minunit_tmp_e = expected; const char* minunit_tmp_r = result;     \
        minunit_assert++;                                                             \
        if(!minunit_tmp_e) { minunit_tmp_e = "<null pointer>"; } if(!minunit_tmp_r) { \
            minunit_tmp_r = "<null pointer>";                                         \
        } if(strcmp(minunit_tmp_e, minunit_tmp_r)) {                                  \
            snprintf(                                                                 \
                minunit_last_message,                                                 \
                MINUNIT_MESSAGE_LEN,                                                  \
                "%s failed:\n\t%s:%d: '%s' expected but was '%s'",                    \
                __func__,                                                             \
                __FILE__,                                                             \
                __LINE__,                                                             \
                minunit_tmp_e,                                                        \
                minunit_tmp_r);                                                       \
            minunit_status = 1;                                                       \
            return;                                                                   \
        } else { minunit_print_progress(); })

#define mu_assert_null(result)                                                    \
    MU__SAFE_BLOCK(                                                               \
        minunit_assert++; if(result == NULL) { minunit_print_progress(); } else { \
            snprintf(                                                             \
                minunit_last_message,                                             \
                MINUNIT_MESSAGE_LEN,                                              \
                "%s failed:\n\t%s:%d: Expected result was not NULL",              \
                __func__,                                                         \
                __FILE__,                                                         \
                __LINE__);                                                        \
            minunit_status = 1;                                                   \
            return;                                                               \
        })

#define mu_assert_not_null(result)                                                \
    MU__SAFE_BLOCK(                                                               \
        minunit_assert++; if(result != NULL) { minunit_print_progress(); } else { \
            snprintf(                                                             \
                minunit_last_message,                                             \
                MINUNIT_MESSAGE_LEN,                                              \
                "%s failed:\n\t%s:%d: Expected result was not NULL",              \
                __func__,                                                         \
                __FILE__,                                                         \
                __LINE__);                                                        \
            minunit_status = 1;                                                   \
            return;                                                               \
        })

#define mu_assert_pointers_eq(pointer1, pointer2)                                                  \
    MU__SAFE_BLOCK(                                                                                \
        minunit_assert++; if(pointer1 == pointer2) { minunit_print_progress(); } else {            \
            snprintf(                                                                              \
                minunit_last_message,                                                              \
                MINUNIT_MESSAGE_LEN,                                                               \
                "%s failed:\n\t%s:%d: Expected the pointers to point to the same memory location", \
                __func__,                                                                          \
                __FILE__,                                                                          \
                __LINE__);                                                                         \
            minunit_status = 1;                                                                    \
            return;                                                                                \
        })

#define mu_assert_pointers_not_eq(pointer1, pointer2)                                              \
    MU__SAFE_BLOCK(                                                                                \
        minunit_assert++; if(pointer1 != pointer2) { minunit_print_progress(); } else {            \
            snprintf(                                                                              \
                minunit_last_message,                                                              \
                MINUNIT_MESSAGE_LEN,                                                               \
                "%s failed:\n\t%s:%d: Expected the pointers to point to the same memory location", \
                __func__,                                                                          \
                __FILE__,                                                                          \
                __LINE__);                                                                         \
            minunit_status = 1;                                                                    \
            return;                                                                                \
        })

/*
 * The following two functions were written by David Robert Nadeau
 * from http://NadeauSoftware.com/ and distributed under the
 * Creative Commons Attribution 3.0 Unported License
 */

/**
 * Returns the real time, in seconds, or -1.0 if an error occurred.
 *
 * Time is measured since an arbitrary and OS-dependent start time.
 * The returned real time is only useful for computing an elapsed time
 * between two calls to this function.
 */
__attribute__((unused)) static double mu_timer_real(void) {
#if defined(_WIN32)
    /* Windows 2000 and later. ---------------------------------- */
    LARGE_INTEGER Time;
    LARGE_INTEGER Frequency;

    QueryPerformanceFrequency(&Frequency);
    QueryPerformanceCounter(&Time);

    Time.QuadPart *= 1000000;
    Time.QuadPart /= Frequency.QuadPart;

    return (double)Time.QuadPart / 1000000.0;

#elif(defined(__hpux) || defined(hpux)) ||                   \
    ((defined(__sun__) || defined(__sun) || defined(sun)) && \
     (defined(__SVR4) || defined(__svr4__)))
    /* HP-UX, Solaris. ------------------------------------------ */
    return (double)gethrtime() / 1000000000.0;

#elif defined(__MACH__) && defined(__APPLE__)
    /* OSX. ----------------------------------------------------- */
    static double timeConvert = 0.0;
    if(timeConvert == 0.0) {
        mach_timebase_info_data_t timeBase;
        (void)mach_timebase_info(&timeBase);
        timeConvert = (double)timeBase.numer / (double)timeBase.denom / 1000000000.0;
    }
    return (double)mach_absolute_time() * timeConvert;

#elif defined(_POSIX_VERSION)
    /* POSIX. --------------------------------------------------- */
    struct timeval tm;
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
    {
        struct timespec ts;
#if defined(CLOCK_MONOTONIC_PRECISE)
        /* BSD. --------------------------------------------- */
        const clockid_t id = CLOCK_MONOTONIC_PRECISE;
#elif defined(CLOCK_MONOTONIC_RAW)
        /* Linux. ------------------------------------------- */
        const clockid_t id = CLOCK_MONOTONIC_RAW;
#elif defined(CLOCK_HIGHRES)
        /* Solaris. ----------------------------------------- */
        const clockid_t id = CLOCK_HIGHRES;
#elif defined(CLOCK_MONOTONIC)
        /* AIX, BSD, Linux, POSIX, Solaris. ----------------- */
        const clockid_t id = CLOCK_MONOTONIC;
#elif defined(CLOCK_REALTIME)
        /* AIX, BSD, HP-UX, Linux, POSIX. ------------------- */
        const clockid_t id = CLOCK_REALTIME;
#else
        const clockid_t id = (clockid_t)-1; /* Unknown. */
#endif /* CLOCK_* */
        if(id != (clockid_t)-1 && clock_gettime(id, &ts) != -1)
            return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
        /* Fall thru. */
    }
#endif /* _POSIX_TIMERS */

    /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, POSIX, Solaris. ----- */
    gettimeofday(&tm, NULL);
    return (double)tm.tv_sec + (double)tm.tv_usec / 1000000.0;
#else
    return -1.0; /* Failed. */
#endif
}

/**
 * Returns the amount of CPU time used by the current process,
 * in seconds, or -1.0 if an error occurred.
 */
__attribute__((unused)) static double mu_timer_cpu(void) {
#if defined(_WIN32)
    /* Windows -------------------------------------------------- */
    FILETIME createTime;
    FILETIME exitTime;
    FILETIME kernelTime;
    FILETIME userTime;

    /* This approach has a resolution of 1/64 second. Unfortunately, Windows' API does not offer better */
    if(GetProcessTimes(GetCurrentProcess(), &createTime, &exitTime, &kernelTime, &userTime) != 0) {
        ULARGE_INTEGER userSystemTime;
        memcpy(&userSystemTime, &userTime, sizeof(ULARGE_INTEGER));
        return (double)userSystemTime.QuadPart / 10000000.0;
    }

#elif defined(__unix__) || defined(__unix) || defined(unix) || \
    (defined(__APPLE__) && defined(__MACH__))
    /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, and Solaris --------- */

#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
    /* Prefer high-res POSIX timers, when available. */
    {
        clockid_t id;
        struct timespec ts;
#if _POSIX_CPUTIME > 0
        /* Clock ids vary by OS.  Query the id, if possible. */
        if(clock_getcpuclockid(0, &id) == -1)
#endif
#if defined(CLOCK_PROCESS_CPUTIME_ID)
            /* Use known clock id for AIX, Linux, or Solaris. */
            id = CLOCK_PROCESS_CPUTIME_ID;
#elif defined(CLOCK_VIRTUAL)
        /* Use known clock id for BSD or HP-UX. */
        id = CLOCK_VIRTUAL;
#else
        id = (clockid_t)-1;
#endif
        if(id != (clockid_t)-1 && clock_gettime(id, &ts) != -1)
            return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
    }
#endif

#if defined(RUSAGE_SELF)
    {
        struct rusage rusage;
        if(getrusage(RUSAGE_SELF, &rusage) != -1)
            return (double)rusage.ru_utime.tv_sec + (double)rusage.ru_utime.tv_usec / 1000000.0;
    }
#endif

#if defined(_SC_CLK_TCK)
    {
        const double ticks = (double)sysconf(_SC_CLK_TCK);
        struct tms tms;
        if(times(&tms) != (clock_t)-1) return (double)tms.tms_utime / ticks;
    }
#endif

#if defined(CLOCKS_PER_SEC)
    {
        clock_t cl = clock();
        if(cl != (clock_t)-1) return (double)cl / (double)CLOCKS_PER_SEC;
    }
#endif

#endif

    return -1; /* Failed. */
}

#ifdef __cplusplus
}
#endif

#endif /* MINUNIT_MINUNIT_H */