libc/test/src/stdio/fscanf_test.cpp

   1 //===-- Unittests for fscanf ----------------------------------------------===//
   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/CPP/string_view.h"
  10
  11 #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
  12 #include "src/stdio/fclose.h"
  13 #include "src/stdio/ferror.h"
  14 #include "src/stdio/fopen.h"
  15 #include "src/stdio/fwrite.h"
  16 #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  17
  18 #include "src/stdio/fscanf.h"
  19
  20 #include "test/UnitTest/Test.h"
  21
  22 namespace scanf_test {
  23 #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
  24 using LIBC_NAMESPACE::fclose;
  25 using LIBC_NAMESPACE::ferror;
  26 using LIBC_NAMESPACE::fopen;
  27 using LIBC_NAMESPACE::fwrite;
  28 #else  // defined(LIBC_COPT_STDIO_USE_SYSTEM_FILE)
  29 using ::fclose;
  30 using ::ferror;
  31 using ::fopen;
  32 using ::fwrite;
  33 #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  34 } // namespace scanf_test
  35
  36 TEST(LlvmLibcFScanfTest, WriteToFile) {
  37   const char *FILENAME = "fscanf_output.test";
  38   auto FILE_PATH = libc_make_test_file_path(FILENAME);
  39   ::FILE *file = scanf_test::fopen(FILE_PATH, "w");
  40   ASSERT_FALSE(file == nullptr);
  41
  42   int read;
  43
  44   constexpr char simple[] = "A simple string with no conversions.\n";
  45
  46   ASSERT_EQ(sizeof(simple) - 1,
  47             scanf_test::fwrite(simple, 1, sizeof(simple) - 1, file));
  48
  49   constexpr char numbers[] = "1234567890\n";
  50
  51   ASSERT_EQ(sizeof(numbers) - 1,
  52             scanf_test::fwrite(numbers, 1, sizeof(numbers) - 1, file));
  53
  54   constexpr char numbers_and_more[] = "1234 and more\n";
  55
  56   ASSERT_EQ(sizeof(numbers_and_more) - 1,
  57             scanf_test::fwrite(numbers_and_more, 1,
  58                                sizeof(numbers_and_more) - 1, file));
  59
  60   read = LIBC_NAMESPACE::fscanf(file,
  61                                 "Reading from a write-only file should fail.");
  62   EXPECT_LT(read, 0);
  63
  64   ASSERT_EQ(0, scanf_test::fclose(file));
  65
  66   file = scanf_test::fopen(FILE_PATH, "r");
  67   ASSERT_FALSE(file == nullptr);
  68
  69   char data[50];
  70   read = LIBC_NAMESPACE::fscanf(file, "%[A-Za-z .\n]", data);
  71   ASSERT_EQ(read, 1);
  72   ASSERT_STREQ(simple, data);
  73
  74   read = LIBC_NAMESPACE::fscanf(file, "%s", data);
  75   ASSERT_EQ(read, 1);
  76   ASSERT_EQ(LIBC_NAMESPACE::cpp::string_view(numbers, 10),
  77             LIBC_NAMESPACE::cpp::string_view(data));
  78
  79   // The format string starts with a space to handle the fact that the %s leaves
  80   // a trailing \n and %c doesn't strip leading whitespace.
  81   read = LIBC_NAMESPACE::fscanf(file, " %50c", data);
  82   ASSERT_EQ(read, 1);
  83   ASSERT_EQ(
  84       LIBC_NAMESPACE::cpp::string_view(numbers_and_more),
  85       LIBC_NAMESPACE::cpp::string_view(data, sizeof(numbers_and_more) - 1));
  86
  87   ASSERT_EQ(scanf_test::ferror(file), 0);
  88   ASSERT_EQ(scanf_test::fclose(file), 0);
  89 }