libc/test/src/stdio/vasprintf_test.cpp

//===-- Unittests for vasprintf--------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/stdio/sprintf.h"
#include "src/stdio/vasprintf.h"
#include "src/string/memset.h"
#include "test/UnitTest/Test.h"

int call_vasprintf(char **__restrict buffer, const char *__restrict format,
                   ...) {
  va_list vlist;
  va_start(vlist, format);
  int ret = LIBC_NAMESPACE::vasprintf(buffer, format, vlist);
  va_end(vlist);
  return ret;
}

TEST(LlvmLibcVASPrintfTest, SimpleNoConv) {
  char *buff = nullptr;
  int written;
  written = call_vasprintf(&buff, "A simple string with no conversions.");
  EXPECT_EQ(written, 36);
  ASSERT_STREQ(buff, "A simple string with no conversions.");
  free(buff);
}

TEST(LlvmLibcVASPrintfTest, PercentConv) {
  char *buff = nullptr;
  int written;

  written = call_vasprintf(&buff, "%%");
  EXPECT_EQ(written, 1);
  ASSERT_STREQ(buff, "%");
  free(buff);

  written = call_vasprintf(&buff, "abc %% def");
  EXPECT_EQ(written, 9);
  ASSERT_STREQ(buff, "abc % def");
  free(buff);

  written = call_vasprintf(&buff, "%%%%%%");
  EXPECT_EQ(written, 3);
  ASSERT_STREQ(buff, "%%%");
  free(buff);
}

TEST(LlvmLibcVASPrintfTest, CharConv) {
  char *buff = nullptr;
  int written;

  written = call_vasprintf(&buff, "%c", 'a');
  EXPECT_EQ(written, 1);
  ASSERT_STREQ(buff, "a");
  free(buff);

  written = call_vasprintf(&buff, "%3c %-3c", '1', '2');
  EXPECT_EQ(written, 7);
  ASSERT_STREQ(buff, "  1 2  ");
  free(buff);

  written = call_vasprintf(&buff, "%*c", 2, '3');
  EXPECT_EQ(written, 2);
  ASSERT_STREQ(buff, " 3");
  free(buff);
}

TEST(LlvmLibcVASPrintfTest, LargeStringNoConv) {
  char *buff = nullptr;
  char long_str[1001];
  LIBC_NAMESPACE::memset(long_str, 'a', 1000);
  long_str[1000] = '\0';
  int written;
  written = call_vasprintf(&buff, long_str);
  EXPECT_EQ(written, 1000);
  ASSERT_STREQ(buff, long_str);
  free(buff);
}

TEST(LlvmLibcVASPrintfTest, ManyReAlloc) {
  char *buff = nullptr;
  const int expected_num_chars = 600;
  int written = call_vasprintf(&buff, "%200s%200s%200s", "", "", "");
  EXPECT_EQ(written, expected_num_chars);

  bool isPadding = true;
  for (int i = 0; i < expected_num_chars; i++) {
    if (buff[i] != ' ') {
      isPadding = false;
      break;
    }
  }
  EXPECT_TRUE(isPadding);
  free(buff);
}