libc/test/src/stdlib/atof_test.cpp

   1 //===-- Unittests for atof ------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/FPUtil/FPBits.h"
  10 #include "src/stdlib/atof.h"
  11
  12 #include "test/UnitTest/Test.h"
  13
  14 #include <errno.h>
  15 #include <limits.h>
  16 #include <stddef.h>
  17
  18 // This is just a simple test to make sure that this function works at all. It's
  19 // functionally identical to strtod so the bulk of the testing is there.
  20 TEST(LlvmLibcAToFTest, SimpleTest) {
  21   __llvm_libc::fputil::FPBits<double> expected_fp =
  22       __llvm_libc::fputil::FPBits<double>(uint64_t(0x405ec00000000000));
  23
  24   errno = 0;
  25   double result = __llvm_libc::atof("123");
  26
  27   __llvm_libc::fputil::FPBits<double> actual_fp =
  28       __llvm_libc::fputil::FPBits<double>(result);
  29
  30   EXPECT_EQ(actual_fp.bits, expected_fp.bits);
  31   EXPECT_EQ(actual_fp.get_sign(), expected_fp.get_sign());
  32   EXPECT_EQ(actual_fp.get_exponent(), expected_fp.get_exponent());
  33   EXPECT_EQ(actual_fp.get_mantissa(), expected_fp.get_mantissa());
  34   EXPECT_EQ(errno, 0);
  35 }
  36
  37 TEST(LlvmLibcAToFTest, FailedParsingTest) {
  38   __llvm_libc::fputil::FPBits<double> expected_fp =
  39       __llvm_libc::fputil::FPBits<double>(uint64_t(0));
  40
  41   errno = 0;
  42   double result = __llvm_libc::atof("???");
  43
  44   __llvm_libc::fputil::FPBits<double> actual_fp =
  45       __llvm_libc::fputil::FPBits<double>(result);
  46
  47   EXPECT_EQ(actual_fp.bits, expected_fp.bits);
  48   EXPECT_EQ(actual_fp.get_sign(), expected_fp.get_sign());
  49   EXPECT_EQ(actual_fp.get_exponent(), expected_fp.get_exponent());
  50   EXPECT_EQ(actual_fp.get_mantissa(), expected_fp.get_mantissa());
  51   EXPECT_EQ(errno, 0);
  52 }