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1//
2// wcsdup.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines _wcsdup() and _wcsdup_dbg(), which dynamically allocate a buffer and
7// duplicate a string into it.
8//
9// These functions allocate storage via malloc() or _malloc_dbg(). The caller
10// is responsible for free()ing the returned array. If the input string is null
11// or if sufficient memory could not be allocated, these functions return null.
12//
13#include <corecrt_internal.h>
14#include <malloc.h>
15#include <string.h>
16
17#ifdef _DEBUG
18
19extern "C" wchar_t* __cdecl _wcsdup(wchar_t const* const string)
20{
21 return _wcsdup_dbg(string, _NORMAL_BLOCK, nullptr, 0);
22}
23
24extern "C" wchar_t* __cdecl _wcsdup_dbg(
25 wchar_t const* const string,
26 int const block_use,
27 char const* const file_name,
28 int const line_number
29 )
30
31#else // ^^^ _DEBUG ^^^ // vvv !_DEBUG vvv //
32
33extern "C" wchar_t* __cdecl _wcsdup(
34 wchar_t const* string
35 )
36
37#endif // !_DEBUG
38{
39 if (string == nullptr)
40 return nullptr;
41
42 size_t const size_in_elements = wcslen(string) + 1;
43
44#ifdef _DEBUG
45 wchar_t* const memory = static_cast<wchar_t*>(_malloc_dbg(
46 size_in_elements * sizeof(wchar_t),
47 block_use,
48 file_name,
49 line_number));
50#else
51 wchar_t* const memory = static_cast<wchar_t*>(malloc(
52 size_in_elements * sizeof(wchar_t)));
53#endif
54
55 if (memory == nullptr)
56 return nullptr;
57
58 _ERRCHECK(wcscpy_s(memory, size_in_elements, string));
59 return memory;
60}