libc/test/src/stdio/vfprintf_test.cpp

   1 //===-- Unittests for vfprintf --------------------------------------------===//
   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 // These tests are copies of the non-v variants of the printf functions. This is
  10 // because these functions are identical in every way except for how the varargs
  11 // are passed.
  12
  13 #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
  14 #include "src/stdio/fclose.h"
  15 #include "src/stdio/ferror.h"
  16 #include "src/stdio/fopen.h"
  17 #include "src/stdio/fread.h"
  18 #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  19
  20 #include "src/stdio/vfprintf.h"
  21
  22 #include "test/UnitTest/Test.h"
  23
  24 namespace printf_test {
  25 #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
  26 using LIBC_NAMESPACE::fclose;
  27 using LIBC_NAMESPACE::ferror;
  28 using LIBC_NAMESPACE::fopen;
  29 using LIBC_NAMESPACE::fread;
  30 #else  // defined(LIBC_COPT_STDIO_USE_SYSTEM_FILE)
  31 using ::fclose;
  32 using ::ferror;
  33 using ::fopen;
  34 using ::fread;
  35 #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
  36 } // namespace printf_test
  37
  38 int call_vfprintf(::FILE *__restrict stream, const char *__restrict format,
  39                   ...) {
  40   va_list vlist;
  41   va_start(vlist, format);
  42   int ret = LIBC_NAMESPACE::vfprintf(stream, format, vlist);
  43   va_end(vlist);
  44   return ret;
  45 }
  46
  47 TEST(LlvmLibcVFPrintfTest, WriteToFile) {
  48   const char *FILENAME = "vfprintf_output.test";
  49   auto FILE_PATH = libc_make_test_file_path(FILENAME);
  50
  51   ::FILE *file = printf_test::fopen(FILE_PATH, "w");
  52   ASSERT_FALSE(file == nullptr);
  53
  54   int written;
  55
  56   constexpr char simple[] = "A simple string with no conversions.\n";
  57   written = call_vfprintf(file, simple);
  58   EXPECT_EQ(written, 37);
  59
  60   constexpr char numbers[] = "1234567890\n";
  61   written = call_vfprintf(file, "%s", numbers);
  62   EXPECT_EQ(written, 11);
  63
  64   constexpr char format_more[] = "%s and more\n";
  65   constexpr char short_numbers[] = "1234";
  66   written = call_vfprintf(file, format_more, short_numbers);
  67   EXPECT_EQ(written, 14);
  68
  69   ASSERT_EQ(0, printf_test::fclose(file));
  70
  71   file = printf_test::fopen(FILE_PATH, "r");
  72   ASSERT_FALSE(file == nullptr);
  73
  74   char data[50];
  75   ASSERT_EQ(printf_test::fread(data, 1, sizeof(simple) - 1, file),
  76             sizeof(simple) - 1);
  77   data[sizeof(simple) - 1] = '\0';
  78   ASSERT_STREQ(data, simple);
  79   ASSERT_EQ(printf_test::fread(data, 1, sizeof(numbers) - 1, file),
  80             sizeof(numbers) - 1);
  81   data[sizeof(numbers) - 1] = '\0';
  82   ASSERT_STREQ(data, numbers);
  83   ASSERT_EQ(printf_test::fread(
  84                 data, 1, sizeof(format_more) + sizeof(short_numbers) - 4, file),
  85             sizeof(format_more) + sizeof(short_numbers) - 4);
  86   data[sizeof(format_more) + sizeof(short_numbers) - 4] = '\0';
  87   ASSERT_STREQ(data, "1234 and more\n");
  88
  89   ASSERT_EQ(printf_test::ferror(file), 0);
  90
  91   written = call_vfprintf(file, "Writing to a read only file should fail.");
  92   EXPECT_LT(written, 0);
  93
  94   ASSERT_EQ(printf_test::fclose(file), 0);
  95 }