//===-- Unittests for strtod ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/__support/FPUtil/FPBits.h"
#include "src/errno/libc_errno.h"
#include "src/stdlib/strtod.h"

#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/RoundingModeUtils.h"
#include "test/UnitTest/Test.h"

#include <limits.h>
#include <stddef.h>

using __llvm_libc::fputil::testing::ForceRoundingModeTest;
using __llvm_libc::fputil::testing::RoundingMode;

using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;

class LlvmLibcStrToDTest : public __llvm_libc::testing::Test,
                           ForceRoundingModeTest<RoundingMode::Nearest> {
public:
  void run_test(const char *inputString, const ptrdiff_t expectedStrLen,
                const uint64_t expectedRawData, const int expectedErrno = 0) {
    // expectedRawData is the expected double result as a uint64_t, organized
    // according to IEEE754:
    //
    // +-- 1 Sign Bit                        +-- 52 Mantissa bits
    // |                                     |
    // |           +-------------------------+------------------------+
    // |           |                                                  |
    // SEEEEEEEEEEEMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
    //  |         |
    //  +----+----+
    //       |
    //       +-- 11 Exponent Bits
    //
    //  This is so that the result can be compared in parts.
    char *str_end = nullptr;

    __llvm_libc::fputil::FPBits<double> expected_fp =
        __llvm_libc::fputil::FPBits<double>(expectedRawData);

    libc_errno = 0;
    double result = __llvm_libc::strtod(inputString, &str_end);
    if (expectedErrno == 0)
      EXPECT_THAT(result, Succeeds<double>(static_cast<double>(expected_fp)));
    else
      EXPECT_THAT(result, Fails<double>(expectedErrno,
                                        static_cast<double>(expected_fp)));
    EXPECT_EQ(str_end - inputString, expectedStrLen);
  }
};

TEST_F(LlvmLibcStrToDTest, SimpleTest) {
  run_test("123", 3, uint64_t(0x405ec00000000000));

  // This should fail on Eisel-Lemire, forcing a fallback to simple decimal
  // conversion.
  run_test("12345678901234549760", 20, uint64_t(0x43e56a95319d63d8));

  // Found while looking for difficult test cases here:
  // https://github.com/nigeltao/parse-number-fxx-test-data/blob/main/more-test-cases/golang-org-issue-36657.txt
  run_test("1090544144181609348835077142190", 31, uint64_t(0x462b8779f2474dfb));

  run_test("0x123", 5, uint64_t(0x4072300000000000));
}

// These are tests that have caused problems in the past.
TEST_F(LlvmLibcStrToDTest, SpecificFailures) {
  run_test("3E70000000000000", 16, uint64_t(0x7FF0000000000000), ERANGE);
  run_test("358416272e-33", 13, uint64_t(0x3adbbb2a68c9d0b9));
  run_test("2.16656806400000023841857910156251e9", 36,
           uint64_t(0x41e0246690000001));
  run_test("27949676547093071875", 20, uint64_t(0x43f83e132bc608c9));
  run_test(
      "100000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000e-800",
      806, 0x3ff0000000000000);
  run_test(
      "100000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000e-799",
      806, 0x4024000000000000);
  run_test(
      "100000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "0000000000e-800",
      807, 0x4024000000000000);
  run_test(
      "10000000000000000000000000000000000000000000000000000000000000000e-64",
      69, 0x3ff0000000000000);
  run_test(
      "100000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000e-128",
      134, 0x3ff0000000000000);
  run_test("1000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "00000000000000000000000000000000000000000000000000000000e-256",
           262, 0x3ff0000000000000);
  run_test("1000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "0000000000000000000000000000000000000000000000000000000000000000000"
           "00000000000000000000000000000000000000000000e-512",
           518, 0x3ff0000000000000);
  run_test(
      "100000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "00000000000000000e-1024",
      1031, 0x3ff0000000000000);
  run_test(
      "0"
      "100000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
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      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "00000000000000000e-1024",
      1032, 0x3ff0000000000000);
}

TEST_F(LlvmLibcStrToDTest, FuzzFailures) {
  run_test("-\xff\xff\xff\xff\xff\xff\xff\x01", 0, uint64_t(0));
  run_test("-.????", 0, uint64_t(0));
  run_test(
      "44444444444444444444444444444444444444444444444444A44444444444444444"
      "44444444444*\x99\xff\xff\xff\xff",
      50, uint64_t(0x4a3e68fdd0e0b2d8));
  run_test("-NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNKNNNNNNNNNNNNNNNNNN?"
           "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN?",
           0, uint64_t(0));
  run_test("0x.666E40", 9, uint64_t(0x3fd99b9000000000));

  // glibc version 2.36 and higher (not tested with lower versions) disagrees
  // with this result, but ours is correct for the nearest rounding mode. See
  // this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30220
  run_test("0x30000002222225p-1077", 22, uint64_t(0x0006000000444445), ERANGE);

  // This value triggered a bug by having an exponent exactly equal to the
  // maximum. The overflow checks would accept a value less than the max value
  // as valid and greater than the max value as invalid (and set it to the max),
  // but an exponent of exactly max value hit the else condition which is
  // intended for underflow and set the exponent to the min exponent.
  run_test(
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      "887774460000000000004300376000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000052385811247017194600000000"
      "000000000171946000000000000000000700460000000000000000000000001000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000020000000000000000"
      "000000000000563168371187884238877744600000000000000000000000000000523858"
      "112470171946000000000000000001719460000000000000000007004600000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000020000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000005238581124701719460000000"
      "000000000017194600000000000000000070046000000000000000000000000000000000"
      "000000000000000000000000000000000000000000000000000000000000000000000000"
      "200000000000000000E608",
      1462, uint64_t(0x7ff0000000000000), ERANGE);

  // Same as above but for hex.
  run_test("0x0164810157p2047", 17, uint64_t(0x7ff0000000000000), ERANGE);

  // This test ensures that only the correct number of characters is accepted.
  // An exponent symbol followed by a sign isn't a valid exponent.
  run_test("2e+", 1, uint64_t(0x4000000000000000));
  run_test("0x2p+", 3, uint64_t(0x4000000000000000));

  // This bug was in the handling of very large exponents in the exponent
  // marker. Previously anything greater than 10,000 would be set to 10,000.
  // This caused incorrect behavior if there were more than 10,000 '0's in the
  // input number, and then a correspondingly large exponent. This test case has
  // 24,744 zeroes.
  run_test(
      "0x."
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      24755, uint64_t(0x7ff0000000000000), ERANGE);
}