wcsncat.cpp

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//
// wcsncat.cpp
//
//      Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Defines wcsncat(), which appends n characters of the source string onto the
// end of the destination string.  The destination string is always null
// terminated.  Unlike wcsncpy, this function does not pad out to 'count'
// characters.
//
#include <string.h>
 
 
#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
 
extern "C" wchar_t* __cdecl wcsncat(
    wchar_t*       const destination,
    wchar_t const* const source,
    size_t         const count
    )
{
    wchar_t* destination_it = destination;
 
    // Find the end of the destination string:
    while (*destination_it)
        ++destination_it;
 
    // Append the source string:
    wchar_t const* source_it = source;
    for (size_t i = 0; i != count; ++i)
    {
        if ((*destination_it++ = *source_it++) == 0)
            return destination;
    }
 
    *destination_it = 0;
 
    return destination;
}