//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <cstring>

#include <cstring>
#include <cassert>
#include <type_traits>

#include "test_macros.h"

#ifndef NULL
#  error NULL not defined
#endif

int main(int, char**) {
  // Functions we get directly from the C library (just check the signature)
  {
    std::size_t s   = 0;
    void* vp        = 0;
    const void* vpc = 0;
    char* cp        = 0;
    const char* cpc = 0;
    ASSERT_SAME_TYPE(void*, decltype(std::memcpy(vp, vpc, s)));
    ASSERT_SAME_TYPE(void*, decltype(std::memmove(vp, vpc, s)));
    ASSERT_SAME_TYPE(char*, decltype(std::strcpy(cp, cpc)));
    ASSERT_SAME_TYPE(char*, decltype(std::strncpy(cp, cpc, s)));
    ASSERT_SAME_TYPE(char*, decltype(std::strcat(cp, cpc)));
    ASSERT_SAME_TYPE(char*, decltype(std::strncat(cp, cpc, s)));
    ASSERT_SAME_TYPE(int, decltype(std::memcmp(vpc, vpc, s)));
    ASSERT_SAME_TYPE(int, decltype(std::strcmp(cpc, cpc)));
    ASSERT_SAME_TYPE(int, decltype(std::strncmp(cpc, cpc, s)));
    ASSERT_SAME_TYPE(int, decltype(std::strcoll(cpc, cpc)));
    ASSERT_SAME_TYPE(std::size_t, decltype(std::strxfrm(cp, cpc, s)));
    ASSERT_SAME_TYPE(std::size_t, decltype(std::strcspn(cpc, cpc)));
    ASSERT_SAME_TYPE(std::size_t, decltype(std::strspn(cpc, cpc)));
    ASSERT_SAME_TYPE(char*, decltype(std::strtok(cp, cpc)));
    ASSERT_SAME_TYPE(void*, decltype(std::memset(vp, 0, s)));
    ASSERT_SAME_TYPE(char*, decltype(std::strerror(0)));
    ASSERT_SAME_TYPE(std::size_t, decltype(std::strlen(cpc)));
  }

  // Functions we (may) reimplement
  {
    // const char* strchr(const char*, int)
    char storage[] = "hello world";
    const char* s  = storage;
    ASSERT_SAME_TYPE(const char*, decltype(std::strchr(s, 'l')));
    const char* res = std::strchr(s, 'l');
    assert(res == &s[2]);
  }
  {
    // char* strchr(char*, int)
    char storage[] = "hello world";
    char* s        = storage;
    ASSERT_SAME_TYPE(char*, decltype(std::strchr(s, 'l')));
    char* res = std::strchr(s, 'l');
    assert(res == &s[2]);
  }

  {
    // const char* strpbrk(const char*, const char*)
    char storage[] = "hello world";
    const char* s  = storage;
    ASSERT_SAME_TYPE(const char*, decltype(std::strpbrk(s, "el")));
    const char* res = std::strpbrk(s, "el");
    assert(res == &s[1]);
  }
  {
    // char* strpbrk(char*, const char*)
    char storage[] = "hello world";
    char* s        = storage;
    ASSERT_SAME_TYPE(char*, decltype(std::strpbrk(s, "el")));
    char* res = std::strpbrk(s, "el");
    assert(res == &s[1]);
  }

  {
    // const char* strrchr(const char*, int)
    char storage[] = "hello world";
    const char* s  = storage;
    ASSERT_SAME_TYPE(const char*, decltype(std::strrchr(s, 'l')));
    const char* res = std::strrchr(s, 'l');
    assert(res == &s[9]);
  }
  {
    // char* strrchr(char*, int)
    char storage[] = "hello world";
    char* s        = storage;
    ASSERT_SAME_TYPE(char*, decltype(std::strrchr(s, 'l')));
    char* res = std::strrchr(s, 'l');
    assert(res == &s[9]);
  }

  {
    // const void* memchr(const void*, int, size_t)
    char storage[]    = "hello world";
    std::size_t count = 11;
    const void* s     = storage;
    ASSERT_SAME_TYPE(const void*, decltype(std::memchr(s, 'l', count)));
    const void* res = std::memchr(s, 'l', count);
    assert(res == &storage[2]);
  }
  {
    // void* memchr(void*, int, size_t)
    char storage[]    = "hello world";
    std::size_t count = 11;
    void* s           = storage;
    ASSERT_SAME_TYPE(void*, decltype(std::memchr(s, 'l', count)));
    void* res = std::memchr(s, 'l', count);
    assert(res == &storage[2]);
  }

  {
    // const char* strstr(const char*, const char*)
    char storage[] = "hello world";
    const char* s  = storage;
    ASSERT_SAME_TYPE(const char*, decltype(std::strstr(s, "wor")));
    const char* res = std::strstr(s, "wor");
    assert(res == &storage[6]);
  }
  {
    // char* strstr(char*, const char*)
    char storage[] = "hello world";
    char* s        = storage;
    ASSERT_SAME_TYPE(char*, decltype(std::strstr(s, "wor")));
    char* res = std::strstr(s, "wor");
    assert(res == &storage[6]);
  }

  return 0;
}