wcsdup.cpp

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//
// wcsdup.cpp
//
//      Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Defines _wcsdup() and _wcsdup_dbg(), which dynamically allocate a buffer and
// duplicate a string into it.
//
// These functions allocate storage via malloc() or _malloc_dbg().  The caller
// is responsible for free()ing the returned array.  If the input string is null
// or if sufficient memory could not be allocated, these functions return null.
//
#include <corecrt_internal.h>
#include <malloc.h>
#include <string.h>
 
#ifdef _DEBUG
 
extern "C" wchar_t* __cdecl _wcsdup(wchar_t const* const string)
{
    return _wcsdup_dbg(string, _NORMAL_BLOCK, nullptr, 0);
}
 
extern "C" wchar_t* __cdecl _wcsdup_dbg(
    wchar_t const* const string,
    int            const block_use,
    char const*    const file_name,
    int            const line_number
    )
 
#else // ^^^ _DEBUG ^^^ // vvv !_DEBUG vvv //
 
extern "C" wchar_t* __cdecl _wcsdup(
    wchar_t const* string
    )
 
#endif // !_DEBUG
{
    if (string == nullptr)
        return nullptr;
 
    size_t const size_in_elements = wcslen(string) + 1;
 
#ifdef _DEBUG
    wchar_t* const memory = static_cast<wchar_t*>(_malloc_dbg(
        size_in_elements * sizeof(wchar_t),
        block_use,
        file_name,
        line_number));
#else
    wchar_t* const memory = static_cast<wchar_t*>(malloc(
        size_in_elements * sizeof(wchar_t)));
#endif
 
    if (memory == nullptr)
        return nullptr;
 
    _ERRCHECK(wcscpy_s(memory, size_in_elements, string));
    return memory;
}