libc/test/src/stdio/vprintf_test.cpp

   1 //===-- Unittests for vprintf --------------------------------------------===//
   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 #include "src/stdio/vprintf.h"
  14
  15 #include "test/UnitTest/Test.h"
  16
  17 int call_vprintf(const char *__restrict format, ...) {
  18   va_list vlist;
  19   va_start(vlist, format);
  20   int ret = LIBC_NAMESPACE::vprintf(format, vlist);
  21   va_end(vlist);
  22   return ret;
  23 }
  24
  25 TEST(LlvmLibcVPrintfTest, PrintOut) {
  26   int written;
  27
  28   constexpr char simple[] = "A simple string with no conversions.\n";
  29   written = call_vprintf(simple);
  30   EXPECT_EQ(written, static_cast<int>(sizeof(simple) - 1));
  31
  32   constexpr char numbers[] = "1234567890\n";
  33   written = call_vprintf("%s", numbers);
  34   EXPECT_EQ(written, static_cast<int>(sizeof(numbers) - 1));
  35
  36   constexpr char format_more[] = "%s and more\n";
  37   constexpr char short_numbers[] = "1234";
  38   written = call_vprintf(format_more, short_numbers);
  39   EXPECT_EQ(written,
  40             static_cast<int>(sizeof(format_more) + sizeof(short_numbers) - 4));
  41 }