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/errno/libc_errno.h"
  11 #include "src/stdlib/atof.h"
  12
  13 #include "test/UnitTest/ErrnoSetterMatcher.h"
  14 #include "test/UnitTest/Test.h"
  15
  16 #include <limits.h>
  17 #include <stddef.h>
  18
  19 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  20
  21 // This is just a simple test to make sure that this function works at all. It's
  22 // functionally identical to strtod so the bulk of the testing is there.
  23 TEST(LlvmLibcAToFTest, SimpleTest) {
  24   LIBC_NAMESPACE::fputil::FPBits<double> expected_fp =
  25       LIBC_NAMESPACE::fputil::FPBits<double>(uint64_t(0x405ec00000000000));
  26
  27   libc_errno = 0;
  28   EXPECT_THAT(LIBC_NAMESPACE::atof("123"),
  29               Succeeds<double>(static_cast<double>(expected_fp)));
  30 }
  31
  32 TEST(LlvmLibcAToFTest, FailedParsingTest) {
  33   libc_errno = 0;
  34   // atof does not flag errors.
  35   EXPECT_THAT(LIBC_NAMESPACE::atof("???"), Succeeds<double>(0.0));
  36 }