libc/test/src/stdio/putc_test.cpp

   1 //===-- Unittests for putc ---------------------------------------------===//
   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/stdio/fclose.h"
  10 #include "src/stdio/ferror.h"
  11 #include "src/stdio/fopen.h"
  12 #include "src/stdio/fread.h"
  13
  14 #include "src/stdio/putc.h"
  15
  16 #include "test/UnitTest/Test.h"
  17
  18 TEST(LlvmLibcPutcTest, WriteToFile) {
  19   constexpr char FILENAME[] = "testdata/putc_output.test";
  20   ::FILE *file = LIBC_NAMESPACE::fopen(FILENAME, "w");
  21   ASSERT_FALSE(file == nullptr);
  22
  23   constexpr char simple[] = "simple letters";
  24   for (size_t i = 0; i < sizeof(simple); ++i) {
  25     ASSERT_EQ(LIBC_NAMESPACE::putc(simple[i], file), 0);
  26   }
  27
  28   ASSERT_EQ(0, LIBC_NAMESPACE::fclose(file));
  29
  30   file = LIBC_NAMESPACE::fopen(FILENAME, "r");
  31   ASSERT_FALSE(file == nullptr);
  32   char data[50];
  33
  34   ASSERT_EQ(LIBC_NAMESPACE::fread(data, 1, sizeof(simple) - 1, file),
  35             sizeof(simple) - 1);
  36   data[sizeof(simple) - 1] = '\0';
  37
  38   ASSERT_STREQ(data, simple);
  39
  40   ASSERT_EQ(LIBC_NAMESPACE::ferror(file), 0);
  41   EXPECT_LT(LIBC_NAMESPACE::putc('L', file), 0);
  42
  43   ASSERT_EQ(LIBC_NAMESPACE::fclose(file), 0);
  44 }