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
|
// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "test.hpp"
#include <algorithm>
#include <array>
#include <assert.h>
#include <charconv>
#include <chrono>
#include <cmath>
#include <fstream>
#include <functional>
#include <iterator>
#include <limits>
#include <locale>
#include <optional>
#include <random>
#include <set>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <string_view>
#include <system_error>
#include <type_traits>
#include <utility>
#include <vector>
#include "double_fixed_precision_to_chars_test_cases_1.hpp"
#include "double_fixed_precision_to_chars_test_cases_2.hpp"
#include "double_fixed_precision_to_chars_test_cases_3.hpp"
#include "double_fixed_precision_to_chars_test_cases_4.hpp"
#include "double_from_chars_test_cases.hpp"
#include "double_general_precision_to_chars_test_cases.hpp"
#include "double_hex_precision_to_chars_test_cases.hpp"
#include "double_scientific_precision_to_chars_test_cases_1.hpp"
#include "double_scientific_precision_to_chars_test_cases_2.hpp"
#include "double_scientific_precision_to_chars_test_cases_3.hpp"
#include "double_scientific_precision_to_chars_test_cases_4.hpp"
#include "double_to_chars_test_cases.hpp"
#include "float_fixed_precision_to_chars_test_cases.hpp"
#include "float_from_chars_test_cases.hpp"
#include "float_general_precision_to_chars_test_cases.hpp"
#include "float_hex_precision_to_chars_test_cases.hpp"
#include "float_scientific_precision_to_chars_test_cases.hpp"
#include "float_to_chars_test_cases.hpp"
using namespace std;
void initialize_randomness(mt19937_64& mt64, const int argc, char** const argv) {
constexpr size_t n = mt19937_64::state_size;
constexpr size_t w = mt19937_64::word_size;
static_assert(w % 32 == 0);
constexpr size_t k = w / 32;
vector<uint32_t> vec(n * k);
puts("USAGE:");
puts("test.exe : generates seed data from random_device.");
puts("test.exe filename.txt : loads seed data from a given text file.");
if (argc == 1) {
random_device rd;
generate(vec.begin(), vec.end(), ref(rd));
puts("Generated seed data.");
} else if (argc == 2) {
const char* const filename = argv[1];
ifstream file(filename);
if (!file) {
printf("ERROR: Can't open %s.\n", filename);
abort();
}
for (auto& elem : vec) {
file >> elem;
if (!file) {
printf("ERROR: Can't read seed data from %s.\n", filename);
abort();
}
}
printf("Loaded seed data from %s.\n", filename);
} else {
puts("ERROR: Too many command-line arguments.");
abort();
}
puts("SEED DATA:");
for (const auto& elem : vec) {
printf("%zu ", static_cast<size_t>(elem));
}
printf("\n");
seed_seq seq(vec.cbegin(), vec.cend());
mt64.seed(seq);
puts("Successfully seeded mt64. First three values:");
for (int i = 0; i < 3; ++i) {
// libc++ uses long for 64-bit values.
printf("0x%016llX\n", static_cast<unsigned long long>(mt64()));
}
}
static_assert((chars_format::scientific & chars_format::fixed) == chars_format{});
static_assert((chars_format::scientific & chars_format::hex) == chars_format{});
static_assert((chars_format::fixed & chars_format::hex) == chars_format{});
static_assert(chars_format::general == (chars_format::fixed | chars_format::scientific));
template <typename T, typename Optional>
void test_common_to_chars(
const T value, const Optional opt_arg, const optional<int> opt_precision, const string_view correct) {
// Important: Test every effective buffer size from 0 through correct.size() and slightly beyond. For the sizes
// less than correct.size(), this verifies that the too-small buffer is correctly detected, and that we don't
// attempt to write outside of it, even by a single char. (This exhaustive validation is necessary because the
// implementation must check whenever it attempts to write. Sometimes we can calculate the total size and perform
// a single check, but sometimes we need to check when writing each part of the result.) Testing correct.size()
// verifies that we can succeed without overrunning, and testing slightly larger sizes verifies that we can succeed
// without attempting to write to extra chars even when they're available. Finally, we also verify that we aren't
// underrunning the buffer. This is a concern because sometimes we walk backwards when rounding.
constexpr size_t BufferPrefix = 20; // detect buffer underruns (specific value isn't important)
constexpr size_t Space = is_integral_v<T> ? 1 + 64 // worst case: -2^63 in binary
: is_same_v<T, float>
? 1 + 151 // worst case: negative min subnormal float, fixed notation
: 1 + 1076; // worst case: negative min subnormal double, fixed notation
constexpr size_t BufferSuffix = 30; // detect buffer overruns (specific value isn't important)
array<char, BufferPrefix + Space + BufferSuffix> buff;
char* const buff_begin = buff.data();
char* const first = buff_begin + BufferPrefix;
char* const buff_end = buff_begin + buff.size();
constexpr size_t ExtraChars = 3;
static_assert(ExtraChars + 10 < BufferSuffix,
"The specific values aren't important, but there should be plenty of room to detect buffer overruns.");
for (size_t n = 0; n <= correct.size() + ExtraChars; ++n) {
assert(n <= static_cast<size_t>(buff_end - first));
char* const last = first + n;
buff.fill('@');
const auto is_fill_char = [](const char c) { return c == '@'; };
to_chars_result result{};
if (opt_precision.has_value()) {
assert(opt_arg.has_value());
if constexpr (is_floating_point_v<T>) {
result = to_chars(first, last, value, opt_arg.value(), opt_precision.value());
} else {
abort();
}
} else if (opt_arg.has_value()) {
result = to_chars(first, last, value, opt_arg.value());
} else {
result = to_chars(first, last, value);
}
if (n < correct.size()) {
assert(result.ptr == last);
assert(result.ec == errc::value_too_large);
assert(all_of(buff_begin, first, is_fill_char));
// [first, last) is unspecified
assert(all_of(last, buff_end, is_fill_char));
} else {
assert(result.ptr == first + correct.size());
assert(result.ec == errc{});
assert(all_of(buff_begin, first, is_fill_char));
assert(equal(first, result.ptr, correct.begin(), correct.end()));
assert(all_of(result.ptr, buff_end, is_fill_char));
}
}
}
template <typename T>
void test_integer_to_chars(const T value, const optional<int> opt_base, const string_view correct) {
test_common_to_chars(value, opt_base, nullopt, correct);
{ // Also test successful from_chars() scenarios.
const char* const correct_first = correct.data();
const char* const correct_last = correct_first + correct.size();
T dest = 0;
const from_chars_result from_res =
(opt_base.has_value() ? from_chars(correct_first, correct_last, dest, opt_base.value())
: from_chars(correct_first, correct_last, dest));
assert(from_res.ptr == correct_last);
assert(from_res.ec == errc{});
assert(dest == value);
}
}
// https://www.wolframalpha.com : Table[BaseForm[n * 2 - 1, n], {n, 2, 36}]
constexpr const char* output_max_digit[] = {"skip0", "skip1", "11", "12", "13", "14", "15", "16", "17", "18", "19",
"1a", "1b", "1c", "1d", "1e", "1f", "1g", "1h", "1i", "1j", "1k", "1l", "1m", "1n", "1o", "1p", "1q", "1r", "1s",
"1t", "1u", "1v", "1w", "1x", "1y", "1z"};
// https://www.wolframalpha.com : Table[BaseForm[k, n], {k, {MEOW, MEOW, MEOW}}, {n, 2, 36}]
constexpr uint64_t stress_chunks_positive = 12000000345000678900ULL;
constexpr pair<uint64_t, array<const char*, 37>> output_positive[] = {
{123U, {{"skip0", "skip1", "1111011", "11120", "1323", "443", "323", "234", "173", "146", "123", "102", "a3", "96",
"8b", "83", "7b", "74", "6f", "69", "63", "5i", "5d", "58", "53", "4n", "4j", "4f", "4b", "47", "43",
"3u", "3r", "3o", "3l", "3i", "3f"}}},
{uint64_t{INT8_MAX}, {{"skip0", "skip1", "1111111", "11201", "1333", "1002", "331", "241", "177", "151", "127",
"106", "a7", "9a", "91", "87", "7f", "78", "71", "6d", "67", "61", "5h", "5c", "57", "52",
"4n", "4j", "4f", "4b", "47", "43", "3v", "3s", "3p", "3m", "3j"}}},
{161U, {{"skip0", "skip1", "10100001", "12222", "2201", "1121", "425", "320", "241", "188", "161", "137", "115",
"c5", "b7", "ab", "a1", "98", "8h", "89", "81", "7e", "77", "70", "6h", "6b", "65", "5q", "5l", "5g",
"5b", "56", "51", "4t", "4p", "4l", "4h"}}},
{UINT8_MAX, {{"skip0", "skip1", "11111111", "100110", "3333", "2010", "1103", "513", "377", "313", "255", "212",
"193", "168", "143", "120", "ff", "f0", "e3", "d8", "cf", "c3", "bd", "b2", "af", "a5", "9l", "9c",
"93", "8n", "8f", "87", "7v", "7o", "7h", "7a", "73"}}},
{1729U, {{"skip0", "skip1", "11011000001", "2101001", "123001", "23404", "12001", "5020", "3301", "2331", "1729",
"1332", "1001", "a30", "8b7", "7a4", "6c1", "5gc", "561", "4f0", "469", "3j7", "3cd", "364", "301",
"2j4", "2ed", "2a1", "25l", "21i", "1rj", "1oo", "1m1", "1jd", "1gt", "1ee", "1c1"}}},
{uint64_t{INT16_MAX}, {{"skip0", "skip1", "111111111111111", "1122221121", "13333333", "2022032", "411411",
"164350", "77777", "48847", "32767", "22689", "16b67", "11bb7", "bd27", "9a97", "7fff",
"6b68", "5b27", "4eeb", "41i7", "3b67", "31f9", "2flf", "28l7", "22ah", "1mc7", "1hpg",
"1dm7", "19rq", "16c7", "1330", "vvv", "u2v", "sbp", "qq7", "pa7"}}},
{57494U, {{"skip0", "skip1", "1110000010010110", "2220212102", "32002112", "3314434", "1122102", "326423", "160226",
"86772", "57494", "3a218", "29332", "20228", "16d4a", "1207e", "e096", "bbg0", "9f82", "8750", "73ee",
"647h", "58h8", "4gfh", "43je", "3goj", "3718", "2onb", "2h9a", "2aag", "23qe", "1spk", "1o4m", "1jq8",
"1fp0", "1bwo", "18d2"}}},
{UINT16_MAX, {{"skip0", "skip1", "1111111111111111", "10022220020", "33333333", "4044120", "1223223", "362031",
"177777", "108806", "65535", "45268", "31b13", "23aa2", "19c51", "14640", "ffff", "d5d0", "b44f",
"9aa4", "83gf", "71cf", "638j", "58k8", "4hif", "44la", "3iof", "38o6", "2rgf", "2jqo", "2cof",
"2661", "1vvv", "1r5u", "1mnh", "1ihf", "1ekf"}}},
{71125478U, {{"skip0", "skip1", "100001111010100100111100110", "11221211112210222", "10033110213212",
"121202003403", "11020244342", "1522361624", "417244746", "157745728", "71125478", "3716a696",
"1b9a06b2", "11973ba8", "9636514", "639e338", "43d49e6", "2g19gfb", "21b9d18", "19dec94", "124addi",
"h8f25b", "dhdfa6", "b13hg2", "8m91he", "7720j3", "5pgj58", "4pmelq", "43k17i", "3dg8ek", "2ro898",
"2f0et8", "23qif6", "1qw5lh", "1j7l7s", "1cdvli", "16cgrq"}}},
{uint64_t{INT32_MAX},
{{"skip0", "skip1", "1111111111111111111111111111111", "12112122212110202101", "1333333333333333",
"13344223434042", "553032005531", "104134211161", "17777777777", "5478773671", "2147483647", "a02220281",
"4bb2308a7", "282ba4aaa", "1652ca931", "c87e66b7", "7fffffff", "53g7f548", "3928g3h1", "27c57h32",
"1db1f927", "140h2d91", "ikf5bf1", "ebelf95", "b5gge57", "8jmdnkm", "6oj8ion", "5ehncka", "4clm98f",
"3hk7987", "2sb6cs7", "2d09uc1", "1vvvvvv", "1lsqtl1", "1d8xqrp", "15v22um", "zik0zj"}}},
{3522553278ULL,
{{"skip0", "skip1", "11010001111101011110010110111110", "100002111022020200020", "3101331132112332",
"24203233201103", "1341312313010", "153202131426", "32175362676", "10074266606", "3522553278", "1548431462",
"823842766", "441a34c6a", "255b8d486", "1593b4753", "d1f5e5be", "89ffb3b6", "5da3e606", "3hgbfb5i",
"2f0fj33i", "1k1ac536", "191b46e2", "10i6fmk8", "ia967l6", "eahia63", "baca9ga", "92d86i6", "78iq4i6",
"5qlc1dc", "4osos2i", "3u1862s", "38vbpdu", "2o0a7ro", "29hx9e6", "1w2dnod", "1m98ji6"}}},
{UINT32_MAX,
{{"skip0", "skip1", "11111111111111111111111111111111", "102002022201221111210", "3333333333333333",
"32244002423140", "1550104015503", "211301422353", "37777777777", "12068657453", "4294967295", "1904440553",
"9ba461593", "535a79888", "2ca5b7463", "1a20dcd80", "ffffffff", "a7ffda90", "704he7g3", "4f5aff65",
"3723ai4f", "281d55i3", "1fj8b183", "1606k7ib", "mb994af", "hek2mgk", "dnchbnl", "b28jpdl", "8pfgih3",
"76beigf", "5qmcpqf", "4q0jto3", "3vvvvvv", "3aokq93", "2qhxjlh", "2br45qa", "1z141z3"}}},
{545890816626160ULL,
{{"skip0", "skip1", "1111100000111110000011100001101100000110111110000", "2122120211122121121021010202111",
"1330013300130031200313300", "1033022333343024014120", "5213002440142255104", "222661211220253465",
"17407603415406760", "2576748547233674", "545890816626160", "148a34aa4706535", "51285369b87494",
"1a57a38b045a95", "98b3383b9766c", "4319d1601875a", "1f07c1c360df0", "ffd471f34f13", "88g09ff9dh84",
"4d0d5e232c53", "2d63h403i580", "1bf5h8185hdj", "kc3g550fkcg", "d41id5k9984", "8ef5n0him4g", "5i2dijfe1la",
"3me22fm5fhi", "2hfmhgg73kd", "1ngpfabr53c", "18i7220bh11", "rm0lcjngpa", "kk1elesni1", "fgfge3c3fg",
"bp4q5l6bjg", "8xna46jp0k", "6wejomvji5", "5di2s1qhv4"}}},
{uint64_t{INT64_MAX},
{{"skip0", "skip1", "111111111111111111111111111111111111111111111111111111111111111",
"2021110011022210012102010021220101220221", "13333333333333333333333333333333",
"1104332401304422434310311212", "1540241003031030222122211", "22341010611245052052300",
"777777777777777777777", "67404283172107811827", "9223372036854775807", "1728002635214590697",
"41a792678515120367", "10b269549075433c37", "4340724c6c71dc7a7", "160e2ad3246366807", "7fffffffffffffff",
"33d3d8307b214008", "16agh595df825fa7", "ba643dci0ffeehh", "5cbfjia3fh26ja7", "2heiciiie82dh97",
"1adaibb21dckfa7", "i6k448cf4192c2", "acd772jnc9l0l7", "64ie1focnn5g77", "3igoecjbmca687", "27c48l5b37oaop",
"1bk39f3ah3dmq7", "q1se8f0m04isb", "hajppbc1fc207", "bm03i95hia437", "7vvvvvvvvvvvv", "5hg4ck9jd4u37",
"3tdtk1v8j6tpp", "2pijmikexrxp7", "1y2p0ij32e8e7"}}},
{stress_chunks_positive,
{{"skip0", "skip1", "1010011010001000100100001011110000101100010101001001010111110100",
"2221221122020020011022001202200200202200", "22122020210023300230111021113310",
"1301130403021123030133211100", "2311004450342244200504500", "30325064311430214266301",
"1232104413605425112764", "87848206138052620680", "12000000345000678900", "2181782a1686924456a",
"54aa47a9058877b130", "150593a5b002c87b16", "571cad2b93c7760a8", "1c60d2676d4e53e00", "a68890bc2c5495f4",
"43499224707a4f4g", "1e052gdga1d26f40", "f06dh4g564c8a91", "769df0d9ace4h50", "3ee7bcj1ajghi4f",
"1k9agc4gfl0l43a", "10id7dakdlcjd22", "dge08fe0l5hl7c", "8184326d31ib60", "4ljbglf3cpim76",
"2pph66481kiiki", "1niph2ao132e58", "14qgbgk3c3iffg", "mhc35an1bhb00", "f78o8ur705ln5", "ad24gngm595fk",
"76e1n5i5v0ivl", "50wu8jsnks82g", "3ja41smfvqb1f", "2j64t3qgq0ut0"}}},
{14454900944617508688ULL,
{{"skip0", "skip1", "1100100010011010000111111101001011100011011000101000111101010000",
"10120022020112011211121221212101012220210", "30202122013331023203120220331100",
"1432224030234034034040234223", "3014532424232535441404120", "34610451042001242144165",
"1442320775134330507520", "116266464747855335823", "14454900944617508688", "266642a9a9471339935",
"662251403263939640", "1895280092bc310481", "68cb9c8292557406c", "23023deab20002893", "c89a1fd2e3628f50",
"50e7147a7db8ef84", "22a34a05086f78ec", "i1dgef04357g7i1", "8g90b882jcj8be8", "49c1kk35i0k24ic",
"272a16i54ebkacg", "15fdih7l3m7k8md", "gbj7303eg9nge0", "9hckfdkj3kkdmd", "5lc7hifdkl4nne",
"3f86e4mgpna5ol", "266pj428na273c", "1bomgjbnlg4m3f", "r5tf1f7f009ji", "iarsig29iqhhm", "ch6gvqbhm53qg",
"8lwtvcdj6rlqr", "61w23lajggp44", "49p1f3dsqqcdx", "31tkqqkxypopc"}}},
{UINT64_MAX,
{{"skip0", "skip1", "1111111111111111111111111111111111111111111111111111111111111111",
"11112220022122120101211020120210210211220", "33333333333333333333333333333333",
"2214220303114400424121122430", "3520522010102100444244423", "45012021522523134134601",
"1777777777777777777777", "145808576354216723756", "18446744073709551615", "335500516a429071284",
"839365134a2a240713", "219505a9511a867b72", "8681049adb03db171", "2c1d56b648c6cd110", "ffffffffffffffff",
"67979g60f5428010", "2d3fgb0b9cg4bd2f", "141c8786h1ccaagg", "b53bjh07be4dj0f", "5e8g4ggg7g56dif",
"2l4lf104353j8kf", "1ddh88h2782i515", "l12ee5fn0ji1if", "c9c336o0mlb7ef", "7b7n2pcniokcgf",
"4eo8hfam6fllmo", "2nc6j26l66rhof", "1n3rsh11f098rn", "14l9lkmo30o40f", "nd075ib45k86f", "fvvvvvvvvvvvv",
"b1w8p7j5q9r6f", "7orp63sh4dphh", "5g24a25twkwff", "3w5e11264sgsf"}}},
};
// https://www.wolframalpha.com : Table[BaseForm[k, n], {k, {MEOW, MEOW, MEOW}}, {n, 2, 36}]
constexpr int64_t stress_chunks_negative = -9000876000000054321LL;
constexpr pair<int64_t, array<const char*, 37>> output_negative[] = {
{-85, {{"skip0", "skip1", "-1010101", "-10011", "-1111", "-320", "-221", "-151", "-125", "-104", "-85", "-78",
"-71", "-67", "-61", "-5a", "-55", "-50", "-4d", "-49", "-45", "-41", "-3j", "-3g", "-3d", "-3a", "-37",
"-34", "-31", "-2r", "-2p", "-2n", "-2l", "-2j", "-2h", "-2f", "-2d"}}},
{INT8_MIN, {{"skip0", "skip1", "-10000000", "-11202", "-2000", "-1003", "-332", "-242", "-200", "-152", "-128",
"-107", "-a8", "-9b", "-92", "-88", "-80", "-79", "-72", "-6e", "-68", "-62", "-5i", "-5d", "-58",
"-53", "-4o", "-4k", "-4g", "-4c", "-48", "-44", "-40", "-3t", "-3q", "-3n", "-3k"}}},
{-1591, {{"skip0", "skip1", "-11000110111", "-2011221", "-120313", "-22331", "-11211", "-4432", "-3067", "-2157",
"-1591", "-1217", "-b07", "-955", "-819", "-711", "-637", "-58a", "-4g7", "-47e", "-3jb", "-3cg",
"-367", "-304", "-2i7", "-2dg", "-295", "-24p", "-20n", "-1pp", "-1n1", "-1ka", "-1hn", "-1f7", "-1cr",
"-1ag", "-187"}}},
{INT16_MIN, {{"skip0", "skip1", "-1000000000000000", "-1122221122", "-20000000", "-2022033", "-411412", "-164351",
"-100000", "-48848", "-32768", "-2268a", "-16b68", "-11bb8", "-bd28", "-9a98", "-8000", "-6b69",
"-5b28", "-4eec", "-41i8", "-3b68", "-31fa", "-2flg", "-28l8", "-22ai", "-1mc8", "-1hph", "-1dm8",
"-19rr", "-16c8", "-1331", "-1000", "-u2w", "-sbq", "-qq8", "-pa8"}}},
{-66748412,
{{"skip0", "skip1", "-11111110100111111111111100", "-11122121011121102", "-3332213333330", "-114041422122",
"-10342352232", "-1440231533", "-376477774", "-148534542", "-66748412", "-34750085", "-1a42b678",
"-10aa0803", "-8c1731a", "-5cd7492", "-3fa7ffc", "-2d03163", "-1h5f3b2", "-17i39c6", "-10h3b0c", "-g749jh",
"-ckkdkg", "-a8c0ak", "-894afk", "-6klmbc", "-5g1i6g", "-4hg4gb", "-3ogi7o", "-37anqb", "-2mc4r2",
"-2a8h7i", "-1vkvvs", "-1n9ca5", "-1fw8sk", "-19gshh", "-13qnek"}}},
{INT32_MIN, {{"skip0", "skip1", "-10000000000000000000000000000000", "-12112122212110202102", "-2000000000000000",
"-13344223434043", "-553032005532", "-104134211162", "-20000000000", "-5478773672", "-2147483648",
"-a02220282", "-4bb2308a8", "-282ba4aab", "-1652ca932", "-c87e66b8", "-80000000", "-53g7f549",
"-3928g3h2", "-27c57h33", "-1db1f928", "-140h2d92", "-ikf5bf2", "-ebelf96", "-b5gge58", "-8jmdnkn",
"-6oj8ioo", "-5ehnckb", "-4clm98g", "-3hk7988", "-2sb6cs8", "-2d09uc2", "-2000000", "-1lsqtl2",
"-1d8xqrq", "-15v22un", "-zik0zk"}}},
{-297139747082649553LL,
{{"skip0", "skip1", "-10000011111101001110000011010010001100000101011111111010001",
"-1222110012002112101210012211022102101", "-100133221300122101200223333101", "-4443033200104011124241203",
"-21313431255203203120401", "-350320603201030412545", "-20375160322140537721", "-1873162471705738371",
"-297139747082649553", "-65150976074a24025", "-173522497b5373101", "-5a60a99bc3b71654", "-1ca51a06cc38ba25",
"-a2a25babe62241d", "-41fa7069182bfd1", "-1d00134fba1769g", "-e4f799fc5f7e81", "-714ebbh8388188",
"-3cahb17836b3hd", "-1j8659jf5hbg3j", "-112bbb2jege5c5", "-dcjfmk2kjb4cc", "-836bm4klbgl61",
"-4ofia1416ee73", "-32ommgjef1l2h", "-1qc52eal5m8ba", "-17n53r05a4r15", "-oa88m2qiqjik", "-gn67qoat5r8d",
"-blgd6n5s90al", "-87t70q8o5fuh", "-5t09hwaqu9qg", "-47vssihaoa4x", "-32p24fbjye7x", "-299r8zck3841"}}},
{stress_chunks_negative,
{{"skip0", "skip1", "-111110011101001100010010000100010000111010101111001010000110001",
"-2012222010200021010000112111002001111200", "-13303221202100202013111321100301",
"-1101001100304341000003214241", "-1522150121302454031001413", "-22054250360123016161454",
"-763514220420725712061", "-65863607100474061450", "-9000876000000054321", "-1689813530958833498",
"-408258185a67069269", "-106b01597a47ba2948", "-41c02922bc776d49b", "-1584cd10979dc84b6",
"-7ce9890887579431", "-327cf6cbc67023c3", "-1604b5f6a0de8129", "-b50d3ef02f124a4", "-59h9bfif0006fg1",
"-2g5d8ekh05d2dfi", "-19i418c38g1chfj", "-hjgf7d0k0gla9a", "-a6b21ncehfa3f9", "-61060fnl003bml",
"-3g88bakondgf8l", "-25q3i730ed21di", "-1al84glo518iip", "-pcli8ig7pjhbo", "-gs31q8id2jnkl",
"-bd7kaglgdrbgk", "-7pqc9123lf51h", "-5d2sd1r5ms7su", "-3q833s8kdrun3", "-2n7vmqigfueqb",
"-1wdu892toj0a9"}}},
{INT64_MIN, {{"skip0", "skip1", "-1000000000000000000000000000000000000000000000000000000000000000",
"-2021110011022210012102010021220101220222", "-20000000000000000000000000000000",
"-1104332401304422434310311213", "-1540241003031030222122212", "-22341010611245052052301",
"-1000000000000000000000", "-67404283172107811828", "-9223372036854775808", "-1728002635214590698",
"-41a792678515120368", "-10b269549075433c38", "-4340724c6c71dc7a8", "-160e2ad3246366808",
"-8000000000000000", "-33d3d8307b214009", "-16agh595df825fa8", "-ba643dci0ffeehi",
"-5cbfjia3fh26ja8", "-2heiciiie82dh98", "-1adaibb21dckfa8", "-i6k448cf4192c3", "-acd772jnc9l0l8",
"-64ie1focnn5g78", "-3igoecjbmca688", "-27c48l5b37oaoq", "-1bk39f3ah3dmq8", "-q1se8f0m04isc",
"-hajppbc1fc208", "-bm03i95hia438", "-8000000000000", "-5hg4ck9jd4u38", "-3tdtk1v8j6tpq",
"-2pijmikexrxp8", "-1y2p0ij32e8e8"}}},
};
template <typename T>
void test_integer_to_chars() {
for (int base = 2; base <= 36; ++base) {
test_integer_to_chars(static_cast<T>(0), base, "0");
test_integer_to_chars(static_cast<T>(1), base, "1");
// tests [3, 71]
test_integer_to_chars(static_cast<T>(base * 2 - 1), base, output_max_digit[base]);
for (const auto& p : output_positive) {
if (p.first <= static_cast<uint64_t>(numeric_limits<T>::max())) {
test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<size_t>(base)]);
}
}
if constexpr (is_signed_v<T>) {
test_integer_to_chars(static_cast<T>(-1), base, "-1");
for (const auto& p : output_negative) {
if (p.first >= static_cast<int64_t>(numeric_limits<T>::min())) {
test_integer_to_chars(static_cast<T>(p.first), base, p.second[static_cast<size_t>(base)]);
}
}
}
}
test_integer_to_chars(static_cast<T>(42), nullopt, "42");
}
enum class TestFromCharsMode { Normal, SignalingNaN };
template <typename T, typename BaseOrFmt>
void test_from_chars(const string_view input, const BaseOrFmt base_or_fmt, const size_t correct_idx,
const errc correct_ec, const optional<T> opt_correct = nullopt,
const TestFromCharsMode mode = TestFromCharsMode::Normal) {
if constexpr (is_integral_v<T>) {
assert(mode == TestFromCharsMode::Normal);
}
constexpr T unmodified = 111;
T dest = unmodified;
const from_chars_result result = from_chars(input.data(), input.data() + input.size(), dest, base_or_fmt);
assert(result.ptr == input.data() + correct_idx);
assert(result.ec == correct_ec);
if (correct_ec == errc{} || (is_floating_point_v<T> && correct_ec == errc::result_out_of_range)) {
if constexpr (is_floating_point_v<T>) {
if (mode == TestFromCharsMode::Normal) {
using Uint = conditional_t<is_same_v<T, float>, uint32_t, uint64_t>;
assert(opt_correct.has_value());
assert(_Bit_cast<Uint>(dest) == _Bit_cast<Uint>(opt_correct.value()));
} else {
assert(mode == TestFromCharsMode::SignalingNaN);
assert(!opt_correct.has_value());
assert(isnan(dest));
}
} else {
assert(opt_correct.has_value());
assert(dest == opt_correct.value());
}
} else {
assert(!opt_correct.has_value());
assert(dest == unmodified);
}
}
constexpr errc inv_arg = errc::invalid_argument;
constexpr errc out_ran = errc::result_out_of_range;
template <typename T>
void test_integer_from_chars() {
for (int base = 2; base <= 36; ++base) {
test_from_chars<T>("", base, 0, inv_arg); // no characters
test_from_chars<T>("@1", base, 0, inv_arg); // '@' is bogus
test_from_chars<T>(".1", base, 0, inv_arg); // '.' is bogus, for integers
test_from_chars<T>("+1", base, 0, inv_arg); // '+' is bogus, N4713 23.20.3 [charconv.from.chars]/3
// "a minus sign is the only sign that may appear"
test_from_chars<T>(" 1", base, 0, inv_arg); // ' ' is bogus, no whitespace in subject sequence
if constexpr (is_unsigned_v<T>) { // N4713 23.20.3 [charconv.from.chars]/3
test_from_chars<T>("-1", base, 0, inv_arg); // "and only if value has a signed type"
}
// N4713 23.20.3 [charconv.from.chars]/1 "[ Note: If the pattern allows for an optional sign,
// but the string has no digit characters following the sign, no characters match the pattern. -end note ]"
test_from_chars<T>("-", base, 0, inv_arg); // '-' followed by no characters
test_from_chars<T>("-@1", base, 0, inv_arg); // '-' followed by bogus '@'
test_from_chars<T>("-.1", base, 0, inv_arg); // '-' followed by bogus '.'
test_from_chars<T>("-+1", base, 0, inv_arg); // '-' followed by bogus '+'
test_from_chars<T>("- 1", base, 0, inv_arg); // '-' followed by bogus ' '
test_from_chars<T>("--1", base, 0, inv_arg); // '-' can't be repeated
vector<char> bogus_digits;
if (base < 10) {
bogus_digits = {static_cast<char>('0' + base), 'A', 'a'};
} else {
// '[' and '{' are bogus for base 36
bogus_digits = {static_cast<char>('A' + (base - 10)), static_cast<char>('a' + (base - 10))};
}
for (const auto& bogus : bogus_digits) {
test_from_chars<T>(bogus + "1"s, base, 0, inv_arg); // bogus digit (for this base)
test_from_chars<T>("-"s + bogus + "1"s, base, 0, inv_arg); // '-' followed by bogus digit
}
// Test leading zeroes.
test_from_chars<T>(string(100, '0'), base, 100, errc{}, static_cast<T>(0));
test_from_chars<T>(string(100, '0') + "11"s, base, 102, errc{}, static_cast<T>(base + 1));
// Test negative zero and negative leading zeroes.
if constexpr (is_signed_v<T>) {
test_from_chars<T>("-0", base, 2, errc{}, static_cast<T>(0));
test_from_chars<T>("-"s + string(100, '0'), base, 101, errc{}, static_cast<T>(0));
test_from_chars<T>("-"s + string(100, '0') + "11"s, base, 103, errc{}, static_cast<T>(-base - 1));
}
// N4713 23.20.3 [charconv.from.chars]/1 "The member ptr of the return value points to the
// first character not matching the pattern, or has the value last if all characters match."
test_from_chars<T>("11", base, 2, errc{}, static_cast<T>(base + 1));
test_from_chars<T>("11@@@", base, 2, errc{}, static_cast<T>(base + 1));
// When overflowing, we need to keep consuming valid digits, in order to return ptr correctly.
test_from_chars<T>(string(100, '1'), base, 100, out_ran);
test_from_chars<T>(string(100, '1') + "@@@"s, base, 100, out_ran);
if constexpr (is_signed_v<T>) {
test_from_chars<T>("-"s + string(100, '1'), base, 101, out_ran);
test_from_chars<T>("-"s + string(100, '1') + "@@@"s, base, 101, out_ran);
}
}
// N4713 23.20.3 [charconv.from.chars]/3 "The pattern is the expected form of the subject sequence
// in the "C" locale for the given nonzero base, as described for strtol"
// C11 7.22.1.4/3 "The letters from a (or A) through z (or Z) are ascribed the values 10 through 35"
for (int i = 0; i < 26; ++i) {
test_from_chars<T>(string(1, static_cast<char>('A' + i)), 36, 1, errc{}, static_cast<T>(10 + i));
test_from_chars<T>(string(1, static_cast<char>('a' + i)), 36, 1, errc{}, static_cast<T>(10 + i));
}
// N4713 23.20.3 [charconv.from.chars]/3 "no "0x" or "0X" prefix shall appear if the value of base is 16"
test_from_chars<T>("0x1729", 16, 1, errc{}, static_cast<T>(0)); // reads '0', stops at 'x'
test_from_chars<T>("0X1729", 16, 1, errc{}, static_cast<T>(0)); // reads '0', stops at 'X'
if constexpr (is_signed_v<T>) {
test_from_chars<T>("-0x1729", 16, 2, errc{}, static_cast<T>(0)); // reads "-0", stops at 'x'
test_from_chars<T>("-0X1729", 16, 2, errc{}, static_cast<T>(0)); // reads "-0", stops at 'X'
}
}
template <typename T>
void test_integer() {
test_integer_to_chars<T>();
test_integer_from_chars<T>();
}
void all_integer_tests() {
test_integer<char>();
test_integer<signed char>();
test_integer<unsigned char>();
test_integer<short>();
test_integer<unsigned short>();
test_integer<int>();
test_integer<unsigned int>();
test_integer<long>();
test_integer<unsigned long>();
test_integer<long long>();
test_integer<unsigned long long>();
// Test overflow scenarios.
test_from_chars<unsigned int>("4294967289", 10, 10, errc{}, 4294967289U); // not risky
test_from_chars<unsigned int>("4294967294", 10, 10, errc{}, 4294967294U); // risky with good digit
test_from_chars<unsigned int>("4294967295", 10, 10, errc{}, 4294967295U); // risky with max digit
test_from_chars<unsigned int>("4294967296", 10, 10, out_ran); // risky with bad digit
test_from_chars<unsigned int>("4294967300", 10, 10, out_ran); // beyond risky
test_from_chars<int>("2147483639", 10, 10, errc{}, 2147483639); // not risky
test_from_chars<int>("2147483646", 10, 10, errc{}, 2147483646); // risky with good digit
test_from_chars<int>("2147483647", 10, 10, errc{}, 2147483647); // risky with max digit
test_from_chars<int>("2147483648", 10, 10, out_ran); // risky with bad digit
test_from_chars<int>("2147483650", 10, 10, out_ran); // beyond risky
test_from_chars<int>("-2147483639", 10, 11, errc{}, -2147483639); // not risky
test_from_chars<int>("-2147483647", 10, 11, errc{}, -2147483647); // risky with good digit
test_from_chars<int>("-2147483648", 10, 11, errc{}, -2147483647 - 1); // risky with max digit
test_from_chars<int>("-2147483649", 10, 11, out_ran); // risky with bad digit
test_from_chars<int>("-2147483650", 10, 11, out_ran); // beyond risky
}
void assert_message_bits(const bool b, const char* const msg, const uint32_t bits) {
if (!b) {
fprintf(stderr, "%s failed for 0x%08zX\n", msg, static_cast<size_t>(bits));
fprintf(stderr, "This is a randomized test.\n");
fprintf(stderr, "DO NOT IGNORE/RERUN THIS FAILURE.\n");
fprintf(stderr, "You must report it to the STL maintainers.\n");
abort();
}
}
void assert_message_bits(const bool b, const char* const msg, const uint64_t bits) {
if (!b) {
// libc++ uses long for 64-bit values.
fprintf(stderr, "%s failed for 0x%016llX\n", msg, static_cast<unsigned long long>(bits));
fprintf(stderr, "This is a randomized test.\n");
fprintf(stderr, "DO NOT IGNORE/RERUN THIS FAILURE.\n");
fprintf(stderr, "You must report it to the STL maintainers.\n");
abort();
}
}
constexpr uint32_t FractionBits = 10; // Tunable for test coverage vs. performance.
static_assert(FractionBits >= 1, "Must test at least 1 fraction bit.");
static_assert(FractionBits <= 23, "There are only 23 fraction bits in a float.");
constexpr uint32_t Fractions = 1U << FractionBits;
constexpr uint32_t Mask32 = ~((1U << FractionBits) - 1U);
constexpr uint64_t Mask64 = ~((1ULL << FractionBits) - 1ULL);
constexpr uint32_t PrefixesToTest = 100; // Tunable for test coverage vs. performance.
static_assert(PrefixesToTest >= 1, "Must test at least 1 prefix.");
constexpr uint32_t PrefixLimit = 2 // sign bit
* 255 // non-INF/NAN exponents for float
* (1U << (23 - FractionBits)); // fraction bits in prefix
static_assert(PrefixesToTest <= PrefixLimit, "Too many prefixes.");
template <bool IsDouble>
void test_floating_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
using UIntType = conditional_t<IsDouble, uint64_t, uint32_t>;
using FloatingType = conditional_t<IsDouble, double, float>;
// "-1.2345678901234567e-100" or "-1.23456789e-10"
constexpr size_t buffer_size = IsDouble ? 24 : 15;
char buffer[buffer_size];
// TODO Enable once std::from_chars has floating point support.
#if 0
FloatingType val;
#endif
// Exact sizes are difficult to prove for fixed notation.
// This must be at least (IsDouble ? 327 : 48), and I suspect that that's exact.
// Here's a loose upper bound:
// 1 character for a negative sign
// + 325 (for double; 46 for float) characters in the "0.000~~~000" prefix of the min subnormal
// + 17 (for double; 9 for float) characters for round-trip digits
constexpr size_t fixed_buffer_size = IsDouble ? 1 + 325 + 17 : 1 + 46 + 9;
char fixed_buffer[fixed_buffer_size];
// worst case: negative sign + max normal + null terminator
constexpr size_t stdio_buffer_size = 1 + (IsDouble ? 309 : 39) + 1;
char stdio_buffer[stdio_buffer_size];
for (uint32_t frac = 0; frac < Fractions; ++frac) {
const UIntType bits = prefix + frac;
const FloatingType input = _Bit_cast<FloatingType>(bits);
{
const auto to_result = to_chars(buffer, end(buffer), input, chars_format::scientific);
assert_message_bits(to_result.ec == errc{}, "to_result.ec", bits);
// TODO Enable once std::from_chars has floating point support.
#if 0
const char* const last = to_result.ptr;
const auto from_result = from_chars(buffer, last, val);
assert_message_bits(from_result.ptr == last, "from_result.ptr", bits);
assert_message_bits(from_result.ec == errc{}, "from_result.ec", bits);
assert_message_bits(_Bit_cast<UIntType>(val) == bits, "round-trip", bits);
#endif
}
{
// Also verify that to_chars() and sprintf_s() emit the same output for integers in fixed notation.
const auto fixed_result = to_chars(fixed_buffer, end(fixed_buffer), input, chars_format::fixed);
assert_message_bits(fixed_result.ec == errc{}, "fixed_result.ec", bits);
const string_view fixed_sv(fixed_buffer, static_cast<size_t>(fixed_result.ptr - fixed_buffer));
if (find(fixed_sv.begin(), fixed_sv.end(), '.') == fixed_sv.end()) {
const int stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.0f", input);
assert_message_bits(stdio_ret != -1, "stdio_ret", bits);
const string_view stdio_sv(stdio_buffer);
assert_message_bits(fixed_sv == stdio_sv, "fixed_sv", bits);
}
}
}
}
template <bool IsDouble>
void test_floating_hex_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
using UIntType = conditional_t<IsDouble, uint64_t, uint32_t>;
using FloatingType = conditional_t<IsDouble, double, float>;
// The precision is the number of hexits after the decimal point.
// These hexits correspond to the explicitly stored fraction bits.
// double explicitly stores 52 fraction bits. 52 / 4 == 13, so we need 13 hexits.
// float explicitly stores 23 fraction bits. 23 / 4 == 5.75, so we need 6 hexits.
// "-1.fffffffffffffp+1023" or "-1.fffffep+127"
constexpr size_t buffer_size = IsDouble ? 22 : 14;
char buffer[buffer_size];
// TODO Enable once std::from_chars has floating point support.
#if 0
FloatingType val;
#endif
for (uint32_t frac = 0; frac < Fractions; ++frac) {
const UIntType bits = prefix + frac;
const FloatingType input = _Bit_cast<FloatingType>(bits);
const auto to_result = to_chars(buffer, end(buffer), input, chars_format::hex);
assert_message_bits(to_result.ec == errc{}, "(hex) to_result.ec", bits);
// TODO Enable once std::from_chars has floating point support.
#if 0
const char* const last = to_result.ptr;
const auto from_result = from_chars(buffer, last, val, chars_format::hex);
assert_message_bits(from_result.ptr == last, "(hex) from_result.ptr", bits);
assert_message_bits(from_result.ec == errc{}, "(hex) from_result.ec", bits);
assert_message_bits(_Bit_cast<UIntType>(val) == bits, "(hex) round-trip", bits);
#endif
}
}
template <bool IsDouble>
void test_floating_precision_prefix(const conditional_t<IsDouble, uint64_t, uint32_t> prefix) {
using UIntType = conditional_t<IsDouble, uint64_t, uint32_t>;
using FloatingType = conditional_t<IsDouble, double, float>;
// Precision for min subnormal in fixed notation. (More than enough for scientific notation.)
constexpr int precision = IsDouble ? 1074 : 149;
// Number of digits for max normal in fixed notation.
constexpr int max_integer_length = IsDouble ? 309 : 39;
// Size for fixed notation. (More than enough for scientific notation.)
constexpr size_t charconv_buffer_size = 1 // negative sign
+ max_integer_length // integer digits
+ 1 // decimal point
+ precision; // fractional digits
char charconv_buffer[charconv_buffer_size];
constexpr size_t stdio_buffer_size = charconv_buffer_size + 1; // null terminator
char stdio_buffer[stdio_buffer_size];
// 1 character for a negative sign
// + worst cases: 0x1.fffffffffffffp-1022 and 0x1.fffffep-126f
constexpr size_t general_buffer_size = 1 + (IsDouble ? 773 : 117);
char general_buffer[general_buffer_size];
char general_stdio_buffer[general_buffer_size + 1]; // + null terminator
for (uint32_t frac = 0; frac < Fractions; ++frac) {
const UIntType bits = prefix + frac;
const FloatingType input = _Bit_cast<FloatingType>(bits);
auto result = to_chars(charconv_buffer, end(charconv_buffer), input, chars_format::fixed, precision);
assert_message_bits(result.ec == errc{}, "to_chars fixed precision", bits);
string_view charconv_sv(charconv_buffer, static_cast<size_t>(result.ptr - charconv_buffer));
int stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.*f", precision, input);
assert_message_bits(stdio_ret != -1, "sprintf_s fixed precision", bits);
string_view stdio_sv(stdio_buffer);
assert_message_bits(charconv_sv == stdio_sv, "fixed precision output", bits);
result = to_chars(charconv_buffer, end(charconv_buffer), input, chars_format::scientific, precision);
assert_message_bits(result.ec == errc{}, "to_chars scientific precision", bits);
charconv_sv = string_view(charconv_buffer, static_cast<size_t>(result.ptr - charconv_buffer));
stdio_ret = sprintf_s(stdio_buffer, size(stdio_buffer), "%.*e", precision, input);
assert_message_bits(stdio_ret != -1, "sprintf_s scientific precision", bits);
stdio_sv = stdio_buffer;
assert_message_bits(charconv_sv == stdio_sv, "scientific precision output", bits);
result = to_chars(general_buffer, end(general_buffer), input, chars_format::general, 5000);
assert_message_bits(result.ec == errc{}, "to_chars general precision", bits);
charconv_sv = string_view(general_buffer, static_cast<size_t>(result.ptr - general_buffer));
stdio_ret = sprintf_s(general_stdio_buffer, size(general_stdio_buffer), "%.5000g", input);
assert_message_bits(stdio_ret != -1, "sprintf_s general precision", bits);
stdio_sv = general_stdio_buffer;
assert_message_bits(charconv_sv == stdio_sv, "general precision output", bits);
}
}
void test_floating_prefixes(mt19937_64& mt64) {
{
set<uint64_t> prefixes64;
while (prefixes64.size() < PrefixesToTest) {
const uint64_t val = mt64();
if ((val & 0x7FF0000000000000ULL) != 0x7FF0000000000000ULL) { // skip INF/NAN
prefixes64.insert(val & Mask64);
}
}
for (const auto& prefix : prefixes64) {
test_floating_prefix<true>(prefix);
test_floating_precision_prefix<true>(prefix);
}
test_floating_hex_prefix<true>(*prefixes64.begin()); // save time by testing fewer hexfloats
}
{
set<uint32_t> prefixes32;
while (prefixes32.size() < PrefixesToTest) {
const uint32_t val = static_cast<uint32_t>(mt64());
if ((val & 0x7F800000U) != 0x7F800000U) { // skip INF/NAN
prefixes32.insert(val & Mask32);
}
}
for (const auto& prefix : prefixes32) {
test_floating_prefix<false>(prefix);
test_floating_precision_prefix<false>(prefix);
}
test_floating_hex_prefix<false>(*prefixes32.begin()); // save time by testing fewer hexfloats
}
}
// TODO Enable once std::from_chars has floating point support.
#if 0
template <typename T>
void test_floating_from_chars(const chars_format fmt) {
test_from_chars<T>("", fmt, 0, inv_arg); // no characters
test_from_chars<T>("@1", fmt, 0, inv_arg); // '@' is bogus
test_from_chars<T>("z1", fmt, 0, inv_arg); // 'z' is bogus
test_from_chars<T>(".", fmt, 0, inv_arg); // '.' without digits is bogus
test_from_chars<T>("+1", fmt, 0, inv_arg); // '+' is bogus
test_from_chars<T>(" 1", fmt, 0, inv_arg); // ' ' is bogus
test_from_chars<T>("p5", fmt, 0, inv_arg); // binary-exponent-part without digits is bogus
test_from_chars<T>("in", fmt, 0, inv_arg); // incomplete inf is bogus
test_from_chars<T>("na", fmt, 0, inv_arg); // incomplete nan is bogus
test_from_chars<T>("-", fmt, 0, inv_arg); // '-' followed by no characters
test_from_chars<T>("-@1", fmt, 0, inv_arg); // '-' followed by bogus '@'
test_from_chars<T>("-z1", fmt, 0, inv_arg); // '-' followed by bogus 'z'
test_from_chars<T>("-.", fmt, 0, inv_arg); // '-' followed by bogus '.'
test_from_chars<T>("-+1", fmt, 0, inv_arg); // '-' followed by bogus '+'
test_from_chars<T>("- 1", fmt, 0, inv_arg); // '-' followed by bogus ' '
test_from_chars<T>("-p5", fmt, 0, inv_arg); // '-' followed by bogus binary-exponent-part
test_from_chars<T>("-in", fmt, 0, inv_arg); // '-' followed by bogus incomplete inf
test_from_chars<T>("-na", fmt, 0, inv_arg); // '-' followed by bogus incomplete nan
test_from_chars<T>("--1", fmt, 0, inv_arg); // '-' can't be repeated
if (fmt != chars_format::hex) { // "e5" are valid hexits
test_from_chars<T>("e5", fmt, 0, inv_arg); // exponent-part without digits is bogus
test_from_chars<T>("-e5", fmt, 0, inv_arg); // '-' followed by bogus exponent-part
}
constexpr T inf = numeric_limits<T>::infinity();
constexpr T qnan = numeric_limits<T>::quiet_NaN();
test_from_chars<T>("InF", fmt, 3, errc{}, inf);
test_from_chars<T>("infinite", fmt, 3, errc{}, inf);
test_from_chars<T>("iNfInItY", fmt, 8, errc{}, inf);
test_from_chars<T>("InfinityMeow", fmt, 8, errc{}, inf);
test_from_chars<T>("-InF", fmt, 4, errc{}, -inf);
test_from_chars<T>("-infinite", fmt, 4, errc{}, -inf);
test_from_chars<T>("-iNfInItY", fmt, 9, errc{}, -inf);
test_from_chars<T>("-InfinityMeow", fmt, 9, errc{}, -inf);
test_from_chars<T>("NaN", fmt, 3, errc{}, qnan);
test_from_chars<T>("nanotech", fmt, 3, errc{}, qnan);
test_from_chars<T>("nan(", fmt, 3, errc{}, qnan);
test_from_chars<T>("nan(@)", fmt, 3, errc{}, qnan);
test_from_chars<T>("nan(()", fmt, 3, errc{}, qnan);
test_from_chars<T>("nan(abc", fmt, 3, errc{}, qnan);
test_from_chars<T>("nan()", fmt, 5, errc{}, qnan);
test_from_chars<T>("nan(abc)def", fmt, 8, errc{}, qnan);
test_from_chars<T>("nan(_09AZaz)", fmt, 12, errc{}, qnan);
test_from_chars<T>("nan(int)", fmt, 8, errc{}, qnan);
test_from_chars<T>("nan(snap)", fmt, 9, errc{}, qnan);
test_from_chars<T>("-NaN", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nanotech", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nan(", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nan(@)", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nan(()", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nan(abc", fmt, 4, errc{}, -qnan);
test_from_chars<T>("-nan()", fmt, 6, errc{}, -qnan);
test_from_chars<T>("-nan(abc)def", fmt, 9, errc{}, -qnan);
test_from_chars<T>("-nan(_09AZaz)", fmt, 13, errc{}, -qnan);
test_from_chars<T>("-nan(int)", fmt, 9, errc{}, -qnan);
test_from_chars<T>("-nan(snap)", fmt, 10, errc{}, -qnan);
// The UCRT considers indeterminate NaN to be negative quiet NaN with no payload bits set.
// It parses "nan(ind)" and "-nan(ind)" identically.
test_from_chars<T>("nan(InD)", fmt, 8, errc{}, -qnan);
test_from_chars<T>("-nan(InD)", fmt, 9, errc{}, -qnan);
test_from_chars<T>("nan(SnAn)", fmt, 9, errc{}, nullopt, TestFromCharsMode::SignalingNaN);
test_from_chars<T>("-nan(SnAn)", fmt, 10, errc{}, nullopt, TestFromCharsMode::SignalingNaN);
switch (fmt) {
case chars_format::general:
test_from_chars<T>("1729", fmt, 4, errc{}, T{1729});
test_from_chars<T>("1729e3", fmt, 6, errc{}, T{1729000});
test_from_chars<T>("10", fmt, 2, errc{}, T{10});
test_from_chars<T>("11.", fmt, 3, errc{}, T{11});
test_from_chars<T>("12.13", fmt, 5, errc{}, static_cast<T>(12.13)); // avoid truncation warning
test_from_chars<T>(".14", fmt, 3, errc{}, static_cast<T>(.14)); // avoid truncation warning
test_from_chars<T>("20e5", fmt, 4, errc{}, T{2000000});
test_from_chars<T>("21.e5", fmt, 5, errc{}, T{2100000});
test_from_chars<T>("22.23e5", fmt, 7, errc{}, T{2223000});
test_from_chars<T>(".24e5", fmt, 5, errc{}, T{24000});
test_from_chars<T>("33e+5", fmt, 5, errc{}, T{3300000});
test_from_chars<T>("33e-5", fmt, 5, errc{}, static_cast<T>(.00033)); // avoid truncation warning
test_from_chars<T>("4E7", fmt, 3, errc{}, T{40000000});
test_from_chars<T>("-00123abc", fmt, 6, errc{}, T{-123});
test_from_chars<T>(".0045000", fmt, 8, errc{}, static_cast<T>(.0045)); // avoid truncation warning
test_from_chars<T>("000", fmt, 3, errc{}, T{0});
test_from_chars<T>("0e9999", fmt, 6, errc{}, T{0});
test_from_chars<T>("0e-9999", fmt, 7, errc{}, T{0});
test_from_chars<T>("-000", fmt, 4, errc{}, T{-0.0});
test_from_chars<T>("-0e9999", fmt, 7, errc{}, T{-0.0});
test_from_chars<T>("-0e-9999", fmt, 8, errc{}, T{-0.0});
test_from_chars<T>("1e9999", fmt, 6, errc::result_out_of_range, inf);
test_from_chars<T>("-1e9999", fmt, 7, errc::result_out_of_range, -inf);
test_from_chars<T>("1e-9999", fmt, 7, errc::result_out_of_range, T{0});
test_from_chars<T>("-1e-9999", fmt, 8, errc::result_out_of_range, T{-0.0});
test_from_chars<T>("1" + string(6000, '0'), fmt, 6001, errc::result_out_of_range, inf);
test_from_chars<T>("-1" + string(6000, '0'), fmt, 6002, errc::result_out_of_range, -inf);
test_from_chars<T>("." + string(6000, '0') + "1", fmt, 6002, errc::result_out_of_range, T{0});
test_from_chars<T>("-." + string(6000, '0') + "1", fmt, 6003, errc::result_out_of_range, T{-0.0});
test_from_chars<T>("1" + string(500, '0'), fmt, 501, errc::result_out_of_range, inf);
test_from_chars<T>("-1" + string(500, '0'), fmt, 502, errc::result_out_of_range, -inf);
test_from_chars<T>("." + string(500, '0') + "1", fmt, 502, errc::result_out_of_range, T{0});
test_from_chars<T>("-." + string(500, '0') + "1", fmt, 503, errc::result_out_of_range, T{-0.0});
break;
case chars_format::scientific:
test_from_chars<T>("1729", fmt, 0, inv_arg);
test_from_chars<T>("1729e3", fmt, 6, errc{}, T{1729000});
break;
case chars_format::fixed:
test_from_chars<T>("1729", fmt, 4, errc{}, T{1729});
test_from_chars<T>("1729e3", fmt, 4, errc{}, T{1729});
break;
case chars_format::hex:
test_from_chars<T>("0x123", fmt, 1, errc{}, T{0});
test_from_chars<T>("a0", fmt, 2, errc{}, T{160});
test_from_chars<T>("a1.", fmt, 3, errc{}, T{161});
test_from_chars<T>("a2.a3", fmt, 5, errc{}, T{162.63671875});
test_from_chars<T>(".a4", fmt, 3, errc{}, T{0.640625});
test_from_chars<T>("a0p5", fmt, 4, errc{}, T{5120});
test_from_chars<T>("a1.p5", fmt, 5, errc{}, T{5152});
test_from_chars<T>("a2.a3p5", fmt, 7, errc{}, T{5204.375});
test_from_chars<T>(".a4p5", fmt, 5, errc{}, T{20.5});
test_from_chars<T>("a0p+5", fmt, 5, errc{}, T{5120});
test_from_chars<T>("a0p-5", fmt, 5, errc{}, T{5});
test_from_chars<T>("ABCDEFP3", fmt, 8, errc{}, T{90075000});
test_from_chars<T>("-00cdrom", fmt, 5, errc{}, T{-205});
test_from_chars<T>(".00ef000", fmt, 8, errc{}, T{0.0036468505859375});
test_from_chars<T>("000", fmt, 3, errc{}, T{0});
test_from_chars<T>("0p9999", fmt, 6, errc{}, T{0});
test_from_chars<T>("0p-9999", fmt, 7, errc{}, T{0});
test_from_chars<T>("-000", fmt, 4, errc{}, T{-0.0});
test_from_chars<T>("-0p9999", fmt, 7, errc{}, T{-0.0});
test_from_chars<T>("-0p-9999", fmt, 8, errc{}, T{-0.0});
test_from_chars<T>("1p9999", fmt, 6, errc::result_out_of_range, inf);
test_from_chars<T>("-1p9999", fmt, 7, errc::result_out_of_range, -inf);
test_from_chars<T>("1p-9999", fmt, 7, errc::result_out_of_range, T{0});
test_from_chars<T>("-1p-9999", fmt, 8, errc::result_out_of_range, T{-0.0});
test_from_chars<T>("1" + string(2000, '0'), fmt, 2001, errc::result_out_of_range, inf);
test_from_chars<T>("-1" + string(2000, '0'), fmt, 2002, errc::result_out_of_range, -inf);
test_from_chars<T>("." + string(2000, '0') + "1", fmt, 2002, errc::result_out_of_range, T{0});
test_from_chars<T>("-." + string(2000, '0') + "1", fmt, 2003, errc::result_out_of_range, T{-0.0});
test_from_chars<T>("1" + string(300, '0'), fmt, 301, errc::result_out_of_range, inf);
test_from_chars<T>("-1" + string(300, '0'), fmt, 302, errc::result_out_of_range, -inf);
test_from_chars<T>("." + string(300, '0') + "1", fmt, 302, errc::result_out_of_range, T{0});
test_from_chars<T>("-." + string(300, '0') + "1", fmt, 303, errc::result_out_of_range, T{-0.0});
break;
}
}
#endif
template <typename T>
void test_floating_to_chars(
const T value, const optional<chars_format> opt_fmt, const optional<int> opt_precision, const string_view correct) {
test_common_to_chars(value, opt_fmt, opt_precision, correct);
}
void all_floating_tests(mt19937_64& mt64) {
test_floating_prefixes(mt64);
// TODO Enable once std::from_chars has floating point support.
#if 0
for (const auto& fmt : {chars_format::general, chars_format::scientific, chars_format::fixed, chars_format::hex}) {
test_floating_from_chars<float>(fmt);
test_floating_from_chars<double>(fmt);
}
// Test rounding.
// See float_from_chars_test_cases.hpp in this directory.
for (const auto& t : float_from_chars_test_cases) {
test_from_chars<float>(t.input, t.fmt, t.correct_idx, t.correct_ec, t.correct_value);
}
// See double_from_chars_test_cases.hpp in this directory.
for (const auto& t : double_from_chars_test_cases) {
test_from_chars<double>(t.input, t.fmt, t.correct_idx, t.correct_ec, t.correct_value);
}
{
// See LWG-2403. This number (exactly 0x1.fffffd00000004 in infinite precision) behaves differently
// when parsed as double and converted to float, versus being parsed as float directly.
const char* const lwg_2403 = "1.999999821186065729339276231257827021181583404541015625";
constexpr float correct_float = 0x1.fffffep0f;
constexpr double correct_double = 0x1.fffffdp0;
constexpr float twice_rounded_float = 0x1.fffffcp0f;
test_from_chars<float>(lwg_2403, chars_format::general, 56, errc{}, correct_float);
test_from_chars<double>(lwg_2403, chars_format::general, 56, errc{}, correct_double);
static_assert(static_cast<float>(correct_double) == twice_rounded_float);
}
// See floating_point_test_cases.hpp.
for (const auto& p : floating_point_test_cases_float) {
test_from_chars<float>(p.first, chars_format::general, strlen(p.first), errc{}, _Bit_cast<float>(p.second));
}
for (const auto& p : floating_point_test_cases_double) {
test_from_chars<double>(p.first, chars_format::general, strlen(p.first), errc{}, _Bit_cast<double>(p.second));
}
#endif
// See float_to_chars_test_cases.hpp in this directory.
for (const auto& t : float_to_chars_test_cases) {
if (t.fmt == chars_format{}) {
test_floating_to_chars(t.value, nullopt, nullopt, t.correct);
} else {
test_floating_to_chars(t.value, t.fmt, nullopt, t.correct);
}
}
// See double_to_chars_test_cases.hpp in this directory.
for (const auto& t : double_to_chars_test_cases) {
if (t.fmt == chars_format{}) {
test_floating_to_chars(t.value, nullopt, nullopt, t.correct);
} else {
test_floating_to_chars(t.value, t.fmt, nullopt, t.correct);
}
}
// See corresponding headers in this directory.
for (const auto& t : float_hex_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : float_fixed_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : float_scientific_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : float_general_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_hex_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_fixed_precision_to_chars_test_cases_1) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_fixed_precision_to_chars_test_cases_2) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_fixed_precision_to_chars_test_cases_3) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_fixed_precision_to_chars_test_cases_4) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_scientific_precision_to_chars_test_cases_1) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_scientific_precision_to_chars_test_cases_2) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_scientific_precision_to_chars_test_cases_3) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_scientific_precision_to_chars_test_cases_4) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
for (const auto& t : double_general_precision_to_chars_test_cases) {
test_floating_to_chars(t.value, t.fmt, t.precision, t.correct);
}
}
int main(int argc, char** argv) {
const auto start = chrono::steady_clock::now();
mt19937_64 mt64;
initialize_randomness(mt64, argc, argv);
all_integer_tests();
all_floating_tests(mt64);
const auto finish = chrono::steady_clock::now();
const long long ms = chrono::duration_cast<chrono::milliseconds>(finish - start).count();
puts("PASS");
printf("Randomized test cases: %zu\n", static_cast<size_t>(PrefixesToTest * Fractions));
printf("Total time: %lld ms\n", ms);
if (ms < 3'000) {
puts("That was fast. Consider tuning PrefixesToTest and FractionBits to test more cases.");
} else if (ms > 30'000) {
puts("That was slow. Consider tuning PrefixesToTest and FractionBits to test fewer cases.");
}
}
|