Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: trunk
Fetching contributors…

Cannot retrieve contributors at this time

file 1356 lines (1217 sloc) 33.868 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
/**********************************************************************

random.c -

$Author$
created at: Fri Dec 24 16:39:21 JST 1993

Copyright (C) 1993-2007 Yukihiro Matsumoto

**********************************************************************/

/*
This is based on trimmed version of MT19937. To get the original version,
contact <http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html>.

The original copyright notice follows.

A C-program for MT19937, with initialization improved 2002/2/10.
Coded by Takuji Nishimura and Makoto Matsumoto.
This is a faster version by taking Shawn Cokus's optimization,
Matthe Bellew's simplification, Isaku Wada's real version.

Before using, initialize the state by using init_genrand(mt, seed)
or init_by_array(mt, init_key, key_length).

Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

3. The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written
permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


Any feedback is very welcome.
http://www.math.keio.ac.jp/matumoto/emt.html
email: matumoto@math.keio.ac.jp
*/

#include "ruby/ruby.h"

#include <limits.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <math.h>
#include <errno.h>

#ifdef _WIN32
# if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0400
# undef _WIN32_WINNT
# define _WIN32_WINNT 0x400
# undef __WINCRYPT_H__
# endif
#include <wincrypt.h>
#endif

typedef int int_must_be_32bit_at_least[sizeof(int) * CHAR_BIT < 32 ? -1 : 1];

/* Period parameters */
#define N 624
#define M 397
#define MATRIX_A 0x9908b0dfU /* constant vector a */
#define UMASK 0x80000000U /* most significant w-r bits */
#define LMASK 0x7fffffffU /* least significant r bits */
#define MIXBITS(u,v) ( ((u) & UMASK) | ((v) & LMASK) )
#define TWIST(u,v) ((MIXBITS((u),(v)) >> 1) ^ ((v)&1U ? MATRIX_A : 0U))

enum {MT_MAX_STATE = N};

struct MT {
    /* assume int is enough to store 32bits */
    unsigned int state[N]; /* the array for the state vector */
    unsigned int *next;
    int left;
};

#define genrand_initialized(mt) ((mt)->next != 0)
#define uninit_genrand(mt) ((mt)->next = 0)

/* initializes state[N] with a seed */
static void
init_genrand(struct MT *mt, unsigned int s)
{
    int j;
    mt->state[0] = s & 0xffffffffU;
    for (j=1; j<N; j++) {
        mt->state[j] = (1812433253U * (mt->state[j-1] ^ (mt->state[j-1] >> 30)) + j);
        /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
        /* In the previous versions, MSBs of the seed affect */
        /* only MSBs of the array state[]. */
        /* 2002/01/09 modified by Makoto Matsumoto */
        mt->state[j] &= 0xffffffff; /* for >32 bit machines */
    }
    mt->left = 1;
    mt->next = mt->state + N;
}

/* initialize by an array with array-length */
/* init_key is the array for initializing keys */
/* key_length is its length */
/* slight change for C++, 2004/2/26 */
static void
init_by_array(struct MT *mt, unsigned int init_key[], int key_length)
{
    int i, j, k;
    init_genrand(mt, 19650218U);
    i=1; j=0;
    k = (N>key_length ? N : key_length);
    for (; k; k--) {
        mt->state[i] = (mt->state[i] ^ ((mt->state[i-1] ^ (mt->state[i-1] >> 30)) * 1664525U))
          + init_key[j] + j; /* non linear */
        mt->state[i] &= 0xffffffffU; /* for WORDSIZE > 32 machines */
        i++; j++;
        if (i>=N) { mt->state[0] = mt->state[N-1]; i=1; }
        if (j>=key_length) j=0;
    }
    for (k=N-1; k; k--) {
        mt->state[i] = (mt->state[i] ^ ((mt->state[i-1] ^ (mt->state[i-1] >> 30)) * 1566083941U))
          - i; /* non linear */
        mt->state[i] &= 0xffffffffU; /* for WORDSIZE > 32 machines */
        i++;
        if (i>=N) { mt->state[0] = mt->state[N-1]; i=1; }
    }

    mt->state[0] = 0x80000000U; /* MSB is 1; assuring non-zero initial array */
}

static void
next_state(struct MT *mt)
{
    unsigned int *p = mt->state;
    int j;

    mt->left = N;
    mt->next = mt->state;

    for (j=N-M+1; --j; p++)
        *p = p[M] ^ TWIST(p[0], p[1]);

    for (j=M; --j; p++)
        *p = p[M-N] ^ TWIST(p[0], p[1]);

    *p = p[M-N] ^ TWIST(p[0], mt->state[0]);
}

/* generates a random number on [0,0xffffffff]-interval */
static unsigned int
genrand_int32(struct MT *mt)
{
    /* mt must be initialized */
    unsigned int y;

    if (--mt->left <= 0) next_state(mt);
    y = *mt->next++;

    /* Tempering */
    y ^= (y >> 11);
    y ^= (y << 7) & 0x9d2c5680;
    y ^= (y << 15) & 0xefc60000;
    y ^= (y >> 18);

    return y;
}

/* generates a random number on [0,1) with 53-bit resolution*/
static double
genrand_real(struct MT *mt)
{
    /* mt must be initialized */
    unsigned int a = genrand_int32(mt)>>5, b = genrand_int32(mt)>>6;
    return(a*67108864.0+b)*(1.0/9007199254740992.0);
}

/* generates a random number on [0,1] with 53-bit resolution*/
static double int_pair_to_real_inclusive(unsigned int a, unsigned int b);
static double
genrand_real2(struct MT *mt)
{
    /* mt must be initialized */
    unsigned int a = genrand_int32(mt), b = genrand_int32(mt);
    return int_pair_to_real_inclusive(a, b);
}

/* These real versions are due to Isaku Wada, 2002/01/09 added */

#undef N
#undef M

/* These real versions are due to Isaku Wada, 2002/01/09 added */

typedef struct {
    VALUE seed;
    struct MT mt;
} rb_random_t;

#define DEFAULT_SEED_CNT 4

static rb_random_t default_rand;

static VALUE rand_init(struct MT *mt, VALUE vseed);
static VALUE random_seed(void);

static rb_random_t *
rand_start(rb_random_t *r)
{
    struct MT *mt = &r->mt;
    if (!genrand_initialized(mt)) {
r->seed = rand_init(mt, random_seed());
    }
    return r;
}

static struct MT *
default_mt(void)
{
    return &rand_start(&default_rand)->mt;
}

unsigned int
rb_genrand_int32(void)
{
    struct MT *mt = default_mt();
    return genrand_int32(mt);
}

double
rb_genrand_real(void)
{
    struct MT *mt = default_mt();
    return genrand_real(mt);
}

#define BDIGITS(x) (RBIGNUM_DIGITS(x))
#define BITSPERDIG (SIZEOF_BDIGITS*CHAR_BIT)
#define BIGRAD ((BDIGIT_DBL)1 << BITSPERDIG)
#define DIGSPERINT (SIZEOF_INT/SIZEOF_BDIGITS)
#define BIGUP(x) ((BDIGIT_DBL)(x) << BITSPERDIG)
#define BIGDN(x) RSHIFT((x),BITSPERDIG)
#define BIGLO(x) ((BDIGIT)((x) & (BIGRAD-1)))
#define BDIGMAX ((BDIGIT)-1)

#define roomof(n, m) (int)(((n)+(m)-1) / (m))
#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
#define SIZEOF_INT32 (31/CHAR_BIT + 1)

static double
int_pair_to_real_inclusive(unsigned int a, unsigned int b)
{
    VALUE x = rb_big_new(roomof(64, BITSPERDIG), 1);
    VALUE m = rb_big_new(roomof(53, BITSPERDIG), 1);
    BDIGIT *xd = BDIGITS(x);
    int i = 0;
    double r;

    xd[i++] = (BDIGIT)b;
#if BITSPERDIG < 32
    xd[i++] = (BDIGIT)(b >> BITSPERDIG);
#endif
    xd[i++] = (BDIGIT)a;
#if BITSPERDIG < 32
    xd[i++] = (BDIGIT)(a >> BITSPERDIG);
#endif
    xd = BDIGITS(m);
#if BITSPERDIG < 53
    MEMZERO(xd, BDIGIT, roomof(53, BITSPERDIG) - 1);
#endif
    xd[53 / BITSPERDIG] = 1 << 53 % BITSPERDIG;
    xd[0] |= 1;
    x = rb_big_mul(x, m);
    if (FIXNUM_P(x)) {
#if CHAR_BIT * SIZEOF_LONG > 64
r = (double)(FIX2ULONG(x) >> 64);
#else
return 0.0;
#endif
    }
    else {
#if 64 % BITSPERDIG == 0
long len = RBIGNUM_LEN(x);
xd = BDIGITS(x);
MEMMOVE(xd, xd + 64 / BITSPERDIG, BDIGIT, len - 64 / BITSPERDIG);
MEMZERO(xd + len - 64 / BITSPERDIG, BDIGIT, 64 / BITSPERDIG);
r = rb_big2dbl(x);
#else
x = rb_big_rshift(x, INT2FIX(64));
if (FIXNUM_P(x)) {
r = (double)FIX2ULONG(x);
}
else {
r = rb_big2dbl(x);
}
#endif
    }
    return ldexp(r, -53);
}

VALUE rb_cRandom;
static VALUE rb_Random_DEFAULT;
#define id_minus '-'
#define id_plus '+'
static ID id_rand, id_bytes;

/* :nodoc: */
static void
random_mark(void *ptr)
{
    rb_gc_mark(((rb_random_t *)ptr)->seed);
}

static void
random_free(void *ptr)
{
    if (ptr != &default_rand)
xfree(ptr);
}

static size_t
random_memsize(const void *ptr)
{
    return ptr ? sizeof(rb_random_t) : 0;
}

static const rb_data_type_t random_data_type = {
    "random",
    {
random_mark,
random_free,
random_memsize,
    },
};

static rb_random_t *
get_rnd(VALUE obj)
{
    rb_random_t *ptr;
    TypedData_Get_Struct(obj, rb_random_t, &random_data_type, ptr);
    return ptr;
}

static rb_random_t *
try_get_rnd(VALUE obj)
{
    if (obj == rb_cRandom) {
return rand_start(&default_rand);
    }
    if (!rb_typeddata_is_kind_of(obj, &random_data_type)) return NULL;
    return DATA_PTR(obj);
}

/* :nodoc: */
static VALUE
random_alloc(VALUE klass)
{
    rb_random_t *rnd;
    VALUE obj = TypedData_Make_Struct(klass, rb_random_t, &random_data_type, rnd);
    rnd->seed = INT2FIX(0);
    return obj;
}

static VALUE
rand_init(struct MT *mt, VALUE vseed)
{
    volatile VALUE seed;
    long blen = 0;
    long fixnum_seed;
    int i, j, len;
    unsigned int buf0[SIZEOF_LONG / SIZEOF_INT32 * 4], *buf = buf0;

    seed = rb_to_int(vseed);
    switch (TYPE(seed)) {
      case T_FIXNUM:
len = 1;
fixnum_seed = FIX2LONG(seed);
        if (fixnum_seed < 0)
            fixnum_seed = -fixnum_seed;
buf[0] = (unsigned int)(fixnum_seed & 0xffffffff);
#if SIZEOF_LONG > SIZEOF_INT32
if ((long)(int32_t)fixnum_seed != fixnum_seed) {
if ((buf[1] = (unsigned int)(fixnum_seed >> 32)) != 0) ++len;
}
#endif
break;
      case T_BIGNUM:
blen = RBIGNUM_LEN(seed);
if (blen == 0) {
len = 1;
}
else {
if (blen > MT_MAX_STATE * SIZEOF_INT32 / SIZEOF_BDIGITS)
blen = MT_MAX_STATE * SIZEOF_INT32 / SIZEOF_BDIGITS;
len = roomof((int)blen * SIZEOF_BDIGITS, SIZEOF_INT32);
}
/* allocate ints for init_by_array */
if (len > numberof(buf0)) buf = ALLOC_N(unsigned int, len);
memset(buf, 0, len * sizeof(*buf));
len = 0;
for (i = (int)(blen-1); 0 <= i; i--) {
j = i * SIZEOF_BDIGITS / SIZEOF_INT32;
#if SIZEOF_BDIGITS < SIZEOF_INT32
buf[j] <<= BITSPERDIG;
#endif
buf[j] |= RBIGNUM_DIGITS(seed)[i];
if (!len && buf[j]) len = j;
}
++len;
break;
      default:
rb_raise(rb_eTypeError, "failed to convert %s into Integer",
rb_obj_classname(vseed));
    }
    if (len <= 1) {
        init_genrand(mt, buf[0]);
    }
    else {
        if (buf[len-1] == 1) /* remove leading-zero-guard */
            len--;
        init_by_array(mt, buf, len);
    }
    if (buf != buf0) xfree(buf);
    return seed;
}

/*
* call-seq: Random.new([seed]) -> prng
*
* Creates new Mersenne Twister based pseudorandom number generator with
* seed. When the argument seed is omitted, the generator is initialized
* with Random.new_seed.
*
* The argument seed is used to ensure repeatable sequences of random numbers
* between different runs of the program.
*
* prng = Random.new(1234)
* [ prng.rand, prng.rand ] #=> [0.191519450378892, 0.622108771039832]
* [ prng.integer(10), prng.integer(1000) ] #=> [4, 664]
* prng = Random.new(1234)
* [ prng.rand, prng.rand ] #=> [0.191519450378892, 0.622108771039832]
*/
static VALUE
random_init(int argc, VALUE *argv, VALUE obj)
{
    VALUE vseed;
    rb_random_t *rnd = get_rnd(obj);

    if (argc == 0) {
vseed = random_seed();
    }
    else {
rb_scan_args(argc, argv, "01", &vseed);
    }
    rnd->seed = rand_init(&rnd->mt, vseed);
    return obj;
}

#define DEFAULT_SEED_LEN (DEFAULT_SEED_CNT * (int)sizeof(int))

#if defined(S_ISCHR) && !defined(DOSISH)
# define USE_DEV_URANDOM 1
#else
# define USE_DEV_URANDOM 0
#endif

static void
fill_random_seed(unsigned int seed[DEFAULT_SEED_CNT])
{
    static int n = 0;
    struct timeval tv;
#if USE_DEV_URANDOM
    int fd;
    struct stat statbuf;
#elif defined(_WIN32)
    HCRYPTPROV prov;
#endif

    memset(seed, 0, DEFAULT_SEED_LEN);

#if USE_DEV_URANDOM
    if ((fd = open("/dev/urandom", O_RDONLY
#ifdef O_NONBLOCK
            |O_NONBLOCK
#endif
#ifdef O_NOCTTY
            |O_NOCTTY
#endif
            )) >= 0) {
        rb_update_max_fd(fd);
        if (fstat(fd, &statbuf) == 0 && S_ISCHR(statbuf.st_mode)) {
if (read(fd, seed, DEFAULT_SEED_LEN) < DEFAULT_SEED_LEN) {
/* abandon */;
}
        }
        close(fd);
    }
#elif defined(_WIN32)
    if (CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
CryptGenRandom(prov, DEFAULT_SEED_LEN, (void *)seed);
CryptReleaseContext(prov, 0);
    }
#endif

    gettimeofday(&tv, 0);
    seed[0] ^= tv.tv_usec;
    seed[1] ^= (unsigned int)tv.tv_sec;
#if SIZEOF_TIME_T > SIZEOF_INT
    seed[0] ^= (unsigned int)((time_t)tv.tv_sec >> SIZEOF_INT * CHAR_BIT);
#endif
    seed[2] ^= getpid() ^ (n++ << 16);
    seed[3] ^= (unsigned int)(VALUE)&seed;
#if SIZEOF_VOIDP > SIZEOF_INT
    seed[2] ^= (unsigned int)((VALUE)&seed >> SIZEOF_INT * CHAR_BIT);
#endif
}

static VALUE
make_seed_value(const void *ptr)
{
    const long len = DEFAULT_SEED_LEN/SIZEOF_BDIGITS;
    BDIGIT *digits;
    NEWOBJ(big, struct RBignum);
    OBJSETUP(big, rb_cBignum, T_BIGNUM);

    RBIGNUM_SET_SIGN(big, 1);
    rb_big_resize((VALUE)big, len + 1);
    digits = RBIGNUM_DIGITS(big);

    MEMCPY(digits, ptr, char, DEFAULT_SEED_LEN);

    /* set leading-zero-guard if need. */
    digits[len] =
#if SIZEOF_INT32 / SIZEOF_BDIGITS > 1
digits[len-2] <= 1 && digits[len-1] == 0
#else
digits[len-1] <= 1
#endif
? 1 : 0;

    return rb_big_norm((VALUE)big);
}

/*
* call-seq: Random.new_seed -> integer
*
* Returns arbitrary value for seed.
*/
static VALUE
random_seed(void)
{
    unsigned int buf[DEFAULT_SEED_CNT];
    fill_random_seed(buf);
    return make_seed_value(buf);
}

/*
* call-seq: prng.seed -> integer
*
* Returns the seed of the generator.
*/
static VALUE
random_get_seed(VALUE obj)
{
    return get_rnd(obj)->seed;
}

/* :nodoc: */
static VALUE
random_copy(VALUE obj, VALUE orig)
{
    rb_random_t *rnd1 = get_rnd(obj);
    rb_random_t *rnd2 = get_rnd(orig);
    struct MT *mt = &rnd1->mt;

    *rnd1 = *rnd2;
    mt->next = mt->state + numberof(mt->state) - mt->left + 1;
    return obj;
}

static VALUE
mt_state(const struct MT *mt)
{
    VALUE bigo = rb_big_new(sizeof(mt->state) / sizeof(BDIGIT), 1);
    BDIGIT *d = RBIGNUM_DIGITS(bigo);
    int i;

    for (i = 0; i < numberof(mt->state); ++i) {
unsigned int x = mt->state[i];
#if SIZEOF_BDIGITS < SIZEOF_INT32
int j;
for (j = 0; j < SIZEOF_INT32 / SIZEOF_BDIGITS; ++j) {
*d++ = BIGLO(x);
x = BIGDN(x);
}
#else
*d++ = (BDIGIT)x;
#endif
    }
    return rb_big_norm(bigo);
}

/* :nodoc: */
static VALUE
random_state(VALUE obj)
{
    rb_random_t *rnd = get_rnd(obj);
    return mt_state(&rnd->mt);
}

/* :nodoc: */
static VALUE
random_s_state(VALUE klass)
{
    return mt_state(&default_rand.mt);
}

/* :nodoc: */
static VALUE
random_left(VALUE obj)
{
    rb_random_t *rnd = get_rnd(obj);
    return INT2FIX(rnd->mt.left);
}

/* :nodoc: */
static VALUE
random_s_left(VALUE klass)
{
    return INT2FIX(default_rand.mt.left);
}

/* :nodoc: */
static VALUE
random_dump(VALUE obj)
{
    rb_random_t *rnd = get_rnd(obj);
    VALUE dump = rb_ary_new2(3);

    rb_ary_push(dump, mt_state(&rnd->mt));
    rb_ary_push(dump, INT2FIX(rnd->mt.left));
    rb_ary_push(dump, rnd->seed);

    return dump;
}

/* :nodoc: */
static VALUE
random_load(VALUE obj, VALUE dump)
{
    rb_random_t *rnd = get_rnd(obj);
    struct MT *mt = &rnd->mt;
    VALUE state, left = INT2FIX(1), seed = INT2FIX(0);
    VALUE *ary;
    unsigned long x;

    Check_Type(dump, T_ARRAY);
    ary = RARRAY_PTR(dump);
    switch (RARRAY_LEN(dump)) {
      case 3:
seed = ary[2];
      case 2:
left = ary[1];
      case 1:
state = ary[0];
break;
      default:
rb_raise(rb_eArgError, "wrong dump data");
    }
    memset(mt->state, 0, sizeof(mt->state));
    if (FIXNUM_P(state)) {
x = FIX2ULONG(state);
mt->state[0] = (unsigned int)x;
#if SIZEOF_LONG / SIZEOF_INT >= 2
mt->state[1] = (unsigned int)(x >> BITSPERDIG);
#endif
#if SIZEOF_LONG / SIZEOF_INT >= 3
mt->state[2] = (unsigned int)(x >> 2 * BITSPERDIG);
#endif
#if SIZEOF_LONG / SIZEOF_INT >= 4
mt->state[3] = (unsigned int)(x >> 3 * BITSPERDIG);
#endif
    }
    else {
BDIGIT *d;
long len;
Check_Type(state, T_BIGNUM);
len = RBIGNUM_LEN(state);
if (len > roomof(sizeof(mt->state), SIZEOF_BDIGITS)) {
len = roomof(sizeof(mt->state), SIZEOF_BDIGITS);
}
#if SIZEOF_BDIGITS < SIZEOF_INT
else if (len % DIGSPERINT) {
d = RBIGNUM_DIGITS(state) + len;
# if DIGSPERINT == 2
--len;
x = *--d;
# else
x = 0;
do {
x = (x << BITSPERDIG) | *--d;
} while (--len % DIGSPERINT);
# endif
mt->state[len / DIGSPERINT] = (unsigned int)x;
}
#endif
if (len > 0) {
d = BDIGITS(state) + len;
do {
--len;
x = *--d;
# if DIGSPERINT == 2
--len;
x = (x << BITSPERDIG) | *--d;
# elif SIZEOF_BDIGITS < SIZEOF_INT
do {
x = (x << BITSPERDIG) | *--d;
} while (--len % DIGSPERINT);
# endif
mt->state[len / DIGSPERINT] = (unsigned int)x;
} while (len > 0);
}
    }
    x = NUM2ULONG(left);
    if (x > numberof(mt->state)) {
rb_raise(rb_eArgError, "wrong value");
    }
    mt->left = (unsigned int)x;
    mt->next = mt->state + numberof(mt->state) - x + 1;
    rnd->seed = rb_to_int(seed);

    return obj;
}

/*
* call-seq:
* srand(number=0) -> old_seed
*
* Seeds the pseudorandom number generator to the value of
* <i>number</i>. If <i>number</i> is omitted,
* seeds the generator using a combination of the time, the
* process id, and a sequence number. (This is also the behavior if
* <code>Kernel::rand</code> is called without previously calling
* <code>srand</code>, but without the sequence.) By setting the seed
* to a known value, scripts can be made deterministic during testing.
* The previous seed value is returned. Also see <code>Kernel::rand</code>.
*/

static VALUE
rb_f_srand(int argc, VALUE *argv, VALUE obj)
{
    VALUE seed, old;
    rb_random_t *r = &default_rand;

    rb_secure(4);
    if (argc == 0) {
seed = random_seed();
    }
    else {
rb_scan_args(argc, argv, "01", &seed);
    }
    old = r->seed;
    r->seed = rand_init(&r->mt, seed);

    return old;
}

static unsigned long
make_mask(unsigned long x)
{
    x = x | x >> 1;
    x = x | x >> 2;
    x = x | x >> 4;
    x = x | x >> 8;
    x = x | x >> 16;
#if 4 < SIZEOF_LONG
    x = x | x >> 32;
#endif
    return x;
}

static unsigned long
limited_rand(struct MT *mt, unsigned long limit)
{
    /* mt must be initialized */
    int i;
    unsigned long val, mask;

    if (!limit) return 0;
    mask = make_mask(limit);
  retry:
    val = 0;
    for (i = SIZEOF_LONG/SIZEOF_INT32-1; 0 <= i; i--) {
        if ((mask >> (i * 32)) & 0xffffffff) {
            val |= (unsigned long)genrand_int32(mt) << (i * 32);
            val &= mask;
            if (limit < val)
                goto retry;
        }
    }
    return val;
}

static VALUE
limited_big_rand(struct MT *mt, struct RBignum *limit)
{
    /* mt must be initialized */
    unsigned long mask, lim, rnd;
    struct RBignum *val;
    long i, len;
    int boundary;

    len = (RBIGNUM_LEN(limit) * SIZEOF_BDIGITS + 3) / 4;
    val = (struct RBignum *)rb_big_clone((VALUE)limit);
    RBIGNUM_SET_SIGN(val, 1);
#if SIZEOF_BDIGITS == 2
# define BIG_GET32(big,i) \
(RBIGNUM_DIGITS(big)[(i)*2] | \
((i)*2+1 < RBIGNUM_LEN(big) ? \
(RBIGNUM_DIGITS(big)[(i)*2+1] << 16) : \
0))
# define BIG_SET32(big,i,d) \
((RBIGNUM_DIGITS(big)[(i)*2] = (d) & 0xffff), \
((i)*2+1 < RBIGNUM_LEN(big) ? \
(RBIGNUM_DIGITS(big)[(i)*2+1] = (d) >> 16) : \
0))
#else
    /* SIZEOF_BDIGITS == 4 */
# define BIG_GET32(big,i) (RBIGNUM_DIGITS(big)[(i)])
# define BIG_SET32(big,i,d) (RBIGNUM_DIGITS(big)[(i)] = (d))
#endif
  retry:
    mask = 0;
    boundary = 1;
    for (i = len-1; 0 <= i; i--) {
        lim = BIG_GET32(limit, i);
        mask = mask ? 0xffffffff : make_mask(lim);
        if (mask) {
            rnd = genrand_int32(mt) & mask;
            if (boundary) {
                if (lim < rnd)
                    goto retry;
                if (rnd < lim)
                    boundary = 0;
            }
        }
        else {
            rnd = 0;
        }
        BIG_SET32(val, i, (BDIGIT)rnd);
    }
    return rb_big_norm((VALUE)val);
}

/*
* Returns random unsigned long value in [0, _limit_].
*
* Note that _limit_ is included, and the range of the argument and the
* return value depends on environments.
*/
unsigned long
rb_genrand_ulong_limited(unsigned long limit)
{
    return limited_rand(default_mt(), limit);
}

unsigned int
rb_random_int32(VALUE obj)
{
    rb_random_t *rnd = try_get_rnd(obj);
    if (!rnd) {
#if SIZEOF_LONG * CHAR_BIT > 32
VALUE lim = ULONG2NUM(0x100000000);
#elif defined HAVE_LONG_LONG
VALUE lim = ULL2NUM((LONG_LONG)0xffffffff+1);
#else
VALUE lim = rb_big_plus(ULONG2NUM(0xffffffff), INT2FIX(1));
#endif
return (unsigned int)NUM2ULONG(rb_funcall2(obj, id_rand, 1, &lim));
    }
    return genrand_int32(&rnd->mt);
}

double
rb_random_real(VALUE obj)
{
    rb_random_t *rnd = try_get_rnd(obj);
    if (!rnd) {
VALUE v = rb_funcall2(obj, id_rand, 0, 0);
double d = NUM2DBL(v);
if (d < 0.0 || d >= 1.0) {
rb_raise(rb_eRangeError, "random number too big %g", d);
}
return d;
    }
    return genrand_real(&rnd->mt);
}

/*
* call-seq: prng.bytes(size) -> a_string
*
* Returns a random binary string. The argument size specified the length of
* the result string.
*/
static VALUE
random_bytes(VALUE obj, VALUE len)
{
    return rb_random_bytes(obj, NUM2LONG(rb_to_int(len)));
}

VALUE
rb_random_bytes(VALUE obj, long n)
{
    rb_random_t *rnd = try_get_rnd(obj);
    VALUE bytes;
    char *ptr;
    unsigned int r, i;

    if (!rnd) {
VALUE len = LONG2NUM(n);
return rb_funcall2(obj, id_bytes, 1, &len);
    }
    bytes = rb_str_new(0, n);
    ptr = RSTRING_PTR(bytes);
    for (; n >= SIZEOF_INT32; n -= SIZEOF_INT32) {
r = genrand_int32(&rnd->mt);
i = SIZEOF_INT32;
do {
*ptr++ = (char)r;
r >>= CHAR_BIT;
        } while (--i);
    }
    if (n > 0) {
r = genrand_int32(&rnd->mt);
do {
*ptr++ = (char)r;
r >>= CHAR_BIT;
} while (--n);
    }
    return bytes;
}

static VALUE
range_values(VALUE vmax, VALUE *begp, VALUE *endp, int *exclp)
{
    VALUE end, r;

    if (!rb_range_values(vmax, begp, &end, exclp)) return Qfalse;
    if (endp) *endp = end;
    if (!rb_respond_to(end, id_minus)) return Qfalse;
    r = rb_funcall2(end, id_minus, 1, begp);
    if (NIL_P(r)) return Qfalse;
    return r;
}

static VALUE
rand_int(struct MT *mt, VALUE vmax, int restrictive)
{
    /* mt must be initialized */
    long max;
    unsigned long r;

    if (FIXNUM_P(vmax)) {
max = FIX2LONG(vmax);
if (!max) return Qnil;
if (max < 0) {
if (restrictive) return Qnil;
max = -max;
}
r = limited_rand(mt, (unsigned long)max - 1);
return ULONG2NUM(r);
    }
    else {
VALUE ret;
if (rb_bigzero_p(vmax)) return Qnil;
if (!RBIGNUM_SIGN(vmax)) {
if (restrictive) return Qnil;
vmax = rb_big_clone(vmax);
RBIGNUM_SET_SIGN(vmax, 1);
}
vmax = rb_big_minus(vmax, INT2FIX(1));
if (FIXNUM_P(vmax)) {
max = FIX2LONG(vmax);
if (max == -1) return Qnil;
r = limited_rand(mt, max);
return LONG2NUM(r);
}
ret = limited_big_rand(mt, RBIGNUM(vmax));
RB_GC_GUARD(vmax);
return ret;
    }
}

static inline double
float_value(VALUE v)
{
    double x = RFLOAT_VALUE(v);
    if (isinf(x) || isnan(x)) {
VALUE error = INT2FIX(EDOM);
rb_exc_raise(rb_class_new_instance(1, &error, rb_eSystemCallError));
    }
    return x;
}

static inline VALUE
rand_range(struct MT* mt, VALUE range)
{
    VALUE beg = Qundef, end = Qundef, vmax, v;
    int excl = 0;

    if ((v = vmax = range_values(range, &beg, &end, &excl)) == Qfalse)
return Qfalse;
    if (!RB_TYPE_P(vmax, T_FLOAT) && (v = rb_check_to_integer(vmax, "to_int"), !NIL_P(v))) {
long max;
vmax = v;
v = Qnil;
if (FIXNUM_P(vmax)) {
fixnum:
if ((max = FIX2LONG(vmax) - excl) >= 0) {
unsigned long r = limited_rand(mt, (unsigned long)max);
v = ULONG2NUM(r);
}
}
else if (BUILTIN_TYPE(vmax) == T_BIGNUM && RBIGNUM_SIGN(vmax) && !rb_bigzero_p(vmax)) {
vmax = excl ? rb_big_minus(vmax, INT2FIX(1)) : rb_big_norm(vmax);
if (FIXNUM_P(vmax)) {
excl = 0;
goto fixnum;
}
v = limited_big_rand(mt, RBIGNUM(vmax));
}
    }
    else if (v = rb_check_to_float(vmax), !NIL_P(v)) {
int scale = 1;
double max = RFLOAT_VALUE(v), mid = 0.5, r;
if (isinf(max)) {
double min = float_value(rb_to_float(beg)) / 2.0;
max = float_value(rb_to_float(end)) / 2.0;
scale = 2;
mid = max + min;
max -= min;
}
else {
float_value(v);
}
v = Qnil;
if (max > 0.0) {
if (excl) {
r = genrand_real(mt);
}
else {
r = genrand_real2(mt);
}
if (scale > 1) {
return rb_float_new(+(+(+(r - 0.5) * max) * scale) + mid);
}
v = rb_float_new(r * max);
}
else if (max == 0.0 && !excl) {
v = rb_float_new(0.0);
}
    }

    if (FIXNUM_P(beg) && FIXNUM_P(v)) {
long x = FIX2LONG(beg) + FIX2LONG(v);
return LONG2NUM(x);
    }
    switch (TYPE(v)) {
      case T_NIL:
break;
      case T_BIGNUM:
return rb_big_plus(v, beg);
      case T_FLOAT: {
VALUE f = rb_check_to_float(beg);
if (!NIL_P(f)) {
RFLOAT_VALUE(v) += RFLOAT_VALUE(f);
return v;
}
      }
      default:
return rb_funcall2(beg, id_plus, 1, &v);
    }

    return v;
}

/*
* call-seq:
* prng.rand -> float
* prng.rand(limit) -> number
*
* When the argument is an +Integer+ or a +Bignum+, it returns a
* random integer greater than or equal to zero and less than the
* argument. Unlike Random.rand, when the argument is a negative
* integer or zero, it raises an ArgumentError.
*
* When the argument is a +Float+, it returns a random floating point
* number between 0.0 and _max_, including 0.0 and excluding _max_.
*
* When the argument _limit_ is a +Range+, it returns a random
* number where range.member?(number) == true.
* prng.rand(5..9) #=> one of [5, 6, 7, 8, 9]
* prng.rand(5...9) #=> one of [5, 6, 7, 8]
* prng.rand(5.0..9.0) #=> between 5.0 and 9.0, including 9.0
* prng.rand(5.0...9.0) #=> between 5.0 and 9.0, excluding 9.0
*
* +begin+/+end+ of the range have to have subtract and add methods.
*
* Otherwise, it raises an ArgumentError.
*/
static VALUE
random_rand(int argc, VALUE *argv, VALUE obj)
{
    rb_random_t *rnd = get_rnd(obj);
    VALUE vmax, v;

    if (argc == 0) {
return rb_float_new(genrand_real(&rnd->mt));
    }
    else if (argc != 1) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..1)", argc);
    }
    vmax = argv[0];
    if (NIL_P(vmax)) {
v = Qnil;
    }
    else if (!RB_TYPE_P(vmax, T_FLOAT) && (v = rb_check_to_integer(vmax, "to_int"), !NIL_P(v))) {
v = rand_int(&rnd->mt, v, 1);
    }
    else if (v = rb_check_to_float(vmax), !NIL_P(v)) {
double max = float_value(v);
if (max > 0.0)
v = rb_float_new(max * genrand_real(&rnd->mt));
else
v = Qnil;
    }
    else if ((v = rand_range(&rnd->mt, vmax)) != Qfalse) {
/* nothing to do */
    }
    else {
v = Qnil;
(void)NUM2LONG(vmax);
    }
    if (NIL_P(v)) {
VALUE mesg = rb_str_new_cstr("invalid argument - ");
rb_str_append(mesg, rb_obj_as_string(argv[0]));
rb_exc_raise(rb_exc_new3(rb_eArgError, mesg));
    }

    return v;
}

/*
* call-seq:
* prng1 == prng2 -> true or false
*
* Returns true if the generators' states equal.
*/
static VALUE
random_equal(VALUE self, VALUE other)
{
    rb_random_t *r1, *r2;
    if (rb_obj_class(self) != rb_obj_class(other)) return Qfalse;
    r1 = get_rnd(self);
    r2 = get_rnd(other);
    if (!RTEST(rb_funcall2(r1->seed, rb_intern("=="), 1, &r2->seed))) return Qfalse;
    if (memcmp(r1->mt.state, r2->mt.state, sizeof(r1->mt.state))) return Qfalse;
    if ((r1->mt.next - r1->mt.state) != (r2->mt.next - r2->mt.state)) return Qfalse;
    if (r1->mt.left != r2->mt.left) return Qfalse;
    return Qtrue;
}

/*
* call-seq:
* rand(max=0) -> number
*
*
* If <i>max</i> is +Range+, returns a pseudorandom number where
* range.member(number) == true.
*
* Or else converts _max_ to an integer using max1 =
* max<code>.to_i.abs</code>.
*
* Then if _max_ is +nil+ the result is zero, returns a pseudorandom floating
* point number greater than or equal to 0.0 and less than 1.0.
*
* Otherwise, returns a pseudorandom integer greater than or equal to zero and
* less than max1.
*
* <code>Kernel::srand</code> may be used to ensure repeatable sequences of
* random numbers between different runs of the program. Ruby currently uses
* a modified Mersenne Twister with a period of 2**19937-1.
*
* srand 1234 #=> 0
* [ rand, rand ] #=> [0.191519450163469, 0.49766366626136]
* [ rand(10), rand(1000) ] #=> [6, 817]
* srand 1234 #=> 1234
* [ rand, rand ] #=> [0.191519450163469, 0.49766366626136]
*/

static VALUE
rb_f_rand(int argc, VALUE *argv, VALUE obj)
{
    VALUE v, vmax, r;
    struct MT *mt = default_mt();

    if (argc == 0) goto zero_arg;
    rb_scan_args(argc, argv, "01", &vmax);
    if (NIL_P(vmax)) goto zero_arg;
    if ((v = rand_range(mt, vmax)) != Qfalse) {
return v;
    }
    vmax = rb_to_int(vmax);
    if (vmax == INT2FIX(0) || NIL_P(r = rand_int(mt, vmax, 0))) {
      zero_arg:
return DBL2NUM(genrand_real(mt));
    }
    return r;
}

/*
* call-seq:
* Random.rand -> float
* Random.rand(limit) -> number
*
* Alias of _Random::DEFAULT.rand_.
*
*/

static VALUE
random_s_rand(int argc, VALUE *argv, VALUE obj)
{
    return random_rand(argc, argv, rb_Random_DEFAULT);
}

static st_index_t hashseed;

static VALUE
init_randomseed(struct MT *mt, unsigned int initial[DEFAULT_SEED_CNT])
{
    VALUE seed;
    fill_random_seed(initial);
    init_by_array(mt, initial, DEFAULT_SEED_CNT);
    seed = make_seed_value(initial);
    memset(initial, 0, DEFAULT_SEED_LEN);
    return seed;
}

void
Init_RandomSeed(void)
{
    rb_random_t *r = &default_rand;
    unsigned int initial[DEFAULT_SEED_CNT];
    struct MT *mt = &r->mt;
    VALUE seed = init_randomseed(mt, initial);

    hashseed = genrand_int32(mt);
#if SIZEOF_ST_INDEX_T*CHAR_BIT > 4*8
    hashseed <<= 32;
    hashseed |= genrand_int32(mt);
#endif
#if SIZEOF_ST_INDEX_T*CHAR_BIT > 8*8
    hashseed <<= 32;
    hashseed |= genrand_int32(mt);
#endif
#if SIZEOF_ST_INDEX_T*CHAR_BIT > 12*8
    hashseed <<= 32;
    hashseed |= genrand_int32(mt);
#endif

    rb_global_variable(&r->seed);
    r->seed = seed;
}

st_index_t
rb_hash_start(st_index_t h)
{
    return st_hash_start(hashseed + h);
}

static void
Init_RandomSeed2(void)
{
    VALUE seed = default_rand.seed;

    if (RB_TYPE_P(seed, T_BIGNUM)) {
RBASIC(seed)->klass = rb_cBignum;
    }
}

void
rb_reset_random_seed(void)
{
    rb_random_t *r = &default_rand;
    uninit_genrand(&r->mt);
    r->seed = INT2FIX(0);
}

void
Init_Random(void)
{
    Init_RandomSeed2();
    rb_define_global_function("srand", rb_f_srand, -1);
    rb_define_global_function("rand", rb_f_rand, -1);

    rb_cRandom = rb_define_class("Random", rb_cObject);
    rb_define_alloc_func(rb_cRandom, random_alloc);
    rb_define_method(rb_cRandom, "initialize", random_init, -1);
    rb_define_method(rb_cRandom, "rand", random_rand, -1);
    rb_define_method(rb_cRandom, "bytes", random_bytes, 1);
    rb_define_method(rb_cRandom, "seed", random_get_seed, 0);
    rb_define_method(rb_cRandom, "initialize_copy", random_copy, 1);
    rb_define_method(rb_cRandom, "marshal_dump", random_dump, 0);
    rb_define_method(rb_cRandom, "marshal_load", random_load, 1);
    rb_define_private_method(rb_cRandom, "state", random_state, 0);
    rb_define_private_method(rb_cRandom, "left", random_left, 0);
    rb_define_method(rb_cRandom, "==", random_equal, 1);

    rb_Random_DEFAULT = TypedData_Wrap_Struct(rb_cRandom, &random_data_type, &default_rand);
    rb_global_variable(&rb_Random_DEFAULT);
    rb_define_const(rb_cRandom, "DEFAULT", rb_Random_DEFAULT);

    rb_define_singleton_method(rb_cRandom, "srand", rb_f_srand, -1);
    rb_define_singleton_method(rb_cRandom, "rand", random_s_rand, -1);
    rb_define_singleton_method(rb_cRandom, "new_seed", random_seed, 0);
    rb_define_private_method(CLASS_OF(rb_cRandom), "state", random_s_state, 0);
    rb_define_private_method(CLASS_OF(rb_cRandom), "left", random_s_left, 0);

    id_rand = rb_intern("rand");
    id_bytes = rb_intern("bytes");
}
Something went wrong with that request. Please try again.