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1//
2// wcsncpy.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines wcsncpy(), which copies a string from one buffer to another. This
7// function copies at most 'count' characters. If fewer than 'count' characters
8// are copied, the rest of the buffer is padded with null characters.
9//
10#include <string.h>
11
12#pragma warning(disable:__WARNING_POSTCONDITION_NULLTERMINATION_VIOLATION) // 26036
13
14
15#ifdef _M_ARM
16 #pragma function(wcsncpy)
17#endif
18
19
20
21extern "C" wchar_t * __cdecl wcsncpy(
22 wchar_t* const destination,
23 wchar_t const* const source,
24 size_t const count
25 )
26{
27 size_t remaining = count;
28
29 wchar_t* destination_it = destination;
30 wchar_t const* source_it = source;
31 while (remaining != 0 && (*destination_it++ = *source_it++) != 0)
32 {
33 --remaining;
34 }
35
36 if (remaining != 0)
37 {
38 while (--remaining != 0)
39 {
40 *destination_it++ = L'\0';
41 }
42 }
43
44 return destination;
45}